mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-11-27 08:10:07 +08:00
92cb18f2a8
Fix crash caused by uninitialised memory that lead to dangling pointer in the rbtree. This can be seen by compiling zsnes 1.50, with a file that define many symbols, such as fxemu2c.asm.
2410 lines
76 KiB
C
2410 lines
76 KiB
C
/* outelf64.c output routines for the Netwide Assembler to produce
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* ELF64 (x86_64 of course) object file format
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*
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* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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* Julian Hall. All rights reserved. The software is
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* redistributable under the license given in the file "LICENSE"
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* distributed in the NASM archive.
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*/
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#include "compiler.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "nasm.h"
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#include "nasmlib.h"
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#include "saa.h"
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#include "raa.h"
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#include "stdscan.h"
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#include "outform.h"
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#include "outlib.h"
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#include "rbtree.h"
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/* Definitions in lieu of elf.h */
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#define SHT_NULL 0 /* Inactive section header */
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#define SHT_PROGBITS 1 /* Program defined content */
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#define SHT_RELA 4 /* Relocation entries with addends */
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#define SHT_NOBITS 8 /* Section requires no space in file */
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#define SHF_WRITE (1 << 0) /* Writable */
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#define SHF_ALLOC (1 << 1) /* Occupies memory during execution */
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#define SHF_EXECINSTR (1 << 2) /* Executable */
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#define SHF_TLS (1 << 10) /* Section hold thread-local data. */
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#define SHN_ABS 0xfff1 /* Associated symbol is absolute */
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#define SHN_COMMON 0xfff2 /* Associated symbol is common */
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#define R_X86_64_NONE 0 /* No reloc */
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#define R_X86_64_64 1 /* Direct 64 bit */
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#define R_X86_64_PC32 2 /* PC relative 32 bit signed */
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#define R_X86_64_GOT32 3 /* 32 bit GOT entry */
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#define R_X86_64_PLT32 4 /* 32 bit PLT address */
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#define R_X86_64_COPY 5 /* Copy symbol at runtime */
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#define R_X86_64_GLOB_DAT 6 /* Create GOT entry */
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#define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */
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#define R_X86_64_RELATIVE 8 /* Adjust by program base */
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#define R_X86_64_GOTPCREL 9 /* 32 bit signed PC relative
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offset to GOT */
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#define R_X86_64_32 10 /* Direct 32 bit zero extended */
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#define R_X86_64_32S 11 /* Direct 32 bit sign extended */
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#define R_X86_64_16 12 /* Direct 16 bit zero extended */
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#define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */
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#define R_X86_64_8 14 /* Direct 8 bit sign extended */
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#define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */
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#define R_X86_64_DTPMOD64 16 /* ID of module containing symbol */
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#define R_X86_64_DTPOFF64 17 /* Offset in module's TLS block */
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#define R_X86_64_TPOFF64 18 /* Offset in initial TLS block */
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#define R_X86_64_TLSGD 19 /* 32 bit signed PC relative offset
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to two GOT entries for GD symbol */
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#define R_X86_64_TLSLD 20 /* 32 bit signed PC relative offset
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to two GOT entries for LD symbol */
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#define R_X86_64_DTPOFF32 21 /* Offset in TLS block */
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#define R_X86_64_GOTTPOFF 22 /* 32 bit signed PC relative offset
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to GOT entry for IE symbol */
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#define R_X86_64_TPOFF32 23 /* Offset in initial TLS block */
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#define R_X86_64_PC64 24 /* word64 S + A - P */
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#define R_X86_64_GOTOFF64 25 /* word64 S + A - GOT */
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#define R_X86_64_GOTPC32 26 /* word32 GOT + A - P */
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#define R_X86_64_GOT64 27 /* word64 G + A */
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#define R_X86_64_GOTPCREL64 28 /* word64 G + GOT - P + A */
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#define R_X86_64_GOTPC64 29 /* word64 GOT - P + A */
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#define R_X86_64_GOTPLT64 30 /* word64 G + A */
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#define R_X86_64_PLTOFF64 31 /* word64 L - GOT + A */
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#define R_X86_64_SIZE32 32 /* word32 Z + A */
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#define R_X86_64_SIZE64 33 /* word64 Z + A */
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#define R_X86_64_GOTPC32_TLSDESC 34 /* word32 */
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#define R_X86_64_TLSDESC_CALL 35 /* none */
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#define R_X86_64_TLSDESC 36 /* word64×2 */
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#define ET_REL 1 /* Relocatable file */
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#define EM_X86_64 62 /* AMD x86-64 architecture */
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#define STT_NOTYPE 0 /* Symbol type is unspecified */
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#define STT_OBJECT 1 /* Symbol is a data object */
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#define STT_FUNC 2 /* Symbol is a code object */
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#define STT_SECTION 3 /* Symbol associated with a section */
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#define STT_FILE 4 /* Symbol's name is file name */
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#define STT_COMMON 5 /* Symbol is a common data object */
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#define STT_TLS 6 /* Symbol is thread-local data object*/
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#define STT_NUM 7 /* Number of defined types. */
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/* Definitions in lieu of dwarf.h */
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#define DW_TAG_compile_unit 0x11
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#define DW_TAG_subprogram 0x2e
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#define DW_AT_name 0x03
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#define DW_AT_stmt_list 0x10
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#define DW_AT_low_pc 0x11
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#define DW_AT_high_pc 0x12
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#define DW_AT_language 0x13
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#define DW_AT_producer 0x25
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#define DW_AT_frame_base 0x40
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#define DW_FORM_addr 0x01
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#define DW_FORM_data2 0x05
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#define DW_FORM_data4 0x06
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#define DW_FORM_string 0x08
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#define DW_LNS_extended_op 0
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#define DW_LNS_advance_pc 2
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#define DW_LNS_advance_line 3
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#define DW_LNS_set_file 4
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#define DW_LNE_end_sequence 1
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#define DW_LNE_set_address 2
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#define DW_LNE_define_file 3
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#define DW_LANG_Mips_Assembler 0x8001
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#define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
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typedef uint32_t Elf64_Word;
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typedef uint64_t Elf64_Xword;
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typedef uint64_t Elf64_Addr;
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typedef uint64_t Elf64_Off;
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typedef struct
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{
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Elf64_Word sh_name; /* Section name (string tbl index) */
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Elf64_Word sh_type; /* Section type */
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Elf64_Xword sh_flags; /* Section flags */
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Elf64_Addr sh_addr; /* Section virtual addr at execution */
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Elf64_Off sh_offset; /* Section file offset */
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Elf64_Xword sh_size; /* Section size in bytes */
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Elf64_Word sh_link; /* Link to another section */
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Elf64_Word sh_info; /* Additional section information */
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Elf64_Xword sh_addralign; /* Section alignment */
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Elf64_Xword sh_entsize; /* Entry size if section holds table */
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} Elf64_Shdr;
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#ifdef OF_ELF64
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struct Reloc {
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struct Reloc *next;
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int64_t address; /* relative to _start_ of section */
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int64_t symbol; /* symbol index */
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int64_t offset; /* symbol addend */
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int type; /* type of relocation */
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};
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struct Symbol {
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struct rbtree symv; /* symbol value and rbtree of globals */
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int32_t strpos; /* string table position of name */
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int32_t section; /* section ID of the symbol */
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int type; /* symbol type */
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int other; /* symbol visibility */
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int32_t size; /* size of symbol */
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int32_t globnum; /* symbol table offset if global */
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struct Symbol *nextfwd; /* list of unresolved-size symbols */
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char *name; /* used temporarily if in above list */
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};
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struct Section {
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struct SAA *data;
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uint64_t len, size;
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uint32_t nrelocs;
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int32_t index; /* index into sects array */
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uint32_t type; /* SHT_PROGBITS or SHT_NOBITS */
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uint64_t align; /* alignment: power of two */
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uint64_t flags; /* section flags */
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char *name;
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struct SAA *rel;
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uint64_t rellen;
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struct Reloc *head, **tail;
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struct rbtree *gsyms; /* global symbols in section */
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};
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#define SECT_DELTA 32
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static struct Section **sects;
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static int nsects, sectlen;
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#define SHSTR_DELTA 256
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static char *shstrtab;
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static int shstrtablen, shstrtabsize;
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static struct SAA *syms;
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static uint32_t nlocals, nglobs;
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static int32_t def_seg;
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static struct RAA *bsym;
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static struct SAA *strs;
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static uint32_t strslen;
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static FILE *elffp;
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static efunc error;
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static evalfunc evaluate;
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static struct Symbol *fwds;
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static char elf_module[FILENAME_MAX];
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static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
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static uint8_t elf_abiver = 0; /* Current ABI version */
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extern struct ofmt of_elf64;
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#define SHN_UNDEF 0
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#define SYM_GLOBAL 0x10
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#define STV_DEFAULT 0
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#define STV_INTERNAL 1
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#define STV_HIDDEN 2
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#define STV_PROTECTED 3
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#define GLOBAL_TEMP_BASE 1048576 /* bigger than any reasonable sym id */
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#define SEG_ALIGN 16 /* alignment of sections in file */
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#define SEG_ALIGN_1 (SEG_ALIGN-1)
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#define TY_DEBUGSYMLIN 0x40 /* internal call to debug_out */
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static struct ELF_SECTDATA {
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void *data;
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int64_t len;
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bool is_saa;
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} *elf_sects;
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static int elf_nsect, nsections;
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static int64_t elf_foffs;
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static void elf_write(void);
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static void elf_sect_write(struct Section *, const void *, size_t);
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static void elf_sect_writeaddr(struct Section *, int64_t, size_t);
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static void elf_section_header(int, int, uint64_t, void *, bool, uint64_t, int, int,
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int, int);
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static void elf_write_sections(void);
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static struct SAA *elf_build_symtab(int32_t *, int32_t *);
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static struct SAA *elf_build_reltab(uint64_t *, struct Reloc *);
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static void add_sectname(char *, char *);
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/* type values for stabs debugging sections */
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#define N_SO 0x64 /* ID for main source file */
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#define N_SOL 0x84 /* ID for sub-source file */
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#define N_BINCL 0x82 /* not currently used */
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#define N_EINCL 0xA2 /* not currently used */
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#define N_SLINE 0x44
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struct stabentry {
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uint32_t n_strx;
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uint8_t n_type;
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uint8_t n_other;
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uint16_t n_desc;
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uint32_t n_value;
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};
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struct erel {
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int offset, info;
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};
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struct symlininfo {
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int offset;
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int section; /* index into sects[] */
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int segto; /* internal section number */
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char *name; /* shallow-copied pointer of section name */
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};
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struct linelist {
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struct symlininfo info;
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int line;
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char *filename;
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struct linelist *next;
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struct linelist *last;
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};
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struct sectlist {
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struct SAA *psaa;
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int section;
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int line;
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int offset;
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int file;
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struct sectlist *next;
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struct sectlist *last;
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};
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/* common debug variables */
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static int currentline = 1;
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static int debug_immcall = 0;
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/* stabs debug variables */
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static struct linelist *stabslines = 0;
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static int numlinestabs = 0;
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static char *stabs_filename = 0;
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static int symtabsection;
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static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
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static int stablen, stabstrlen, stabrellen;
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/* dwarf debug variables */
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static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
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static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
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static int dwarf_numfiles = 0, dwarf_nsections;
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static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
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*abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
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static int8_t line_base = -5, line_range = 14, opcode_base = 13;
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static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
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abbrevlen, linelen, linerellen, framelen, loclen;
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static int64_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
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static struct dfmt df_dwarf;
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static struct dfmt df_stabs;
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static struct Symbol *lastsym;
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/* common debugging routines */
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void debug64_typevalue(int32_t);
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void debug64_init(struct ofmt *, void *, FILE *, efunc);
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void debug64_deflabel(char *, int32_t, int64_t, int, char *);
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void debug64_directive(const char *, const char *);
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/* stabs debugging routines */
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void stabs64_linenum(const char *filename, int32_t linenumber, int32_t);
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void stabs64_output(int, void *);
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void stabs64_generate(void);
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void stabs64_cleanup(void);
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/* dwarf debugging routines */
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void dwarf64_linenum(const char *filename, int32_t linenumber, int32_t);
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void dwarf64_output(int, void *);
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void dwarf64_generate(void);
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void dwarf64_cleanup(void);
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void dwarf64_findfile(const char *);
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void dwarf64_findsect(const int);
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/*
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* Special section numbers which are used to define ELF special
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* symbols, which can be used with WRT to provide PIC relocation
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* types.
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*/
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static int32_t elf_gotpc_sect, elf_gotoff_sect;
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static int32_t elf_got_sect, elf_plt_sect;
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static int32_t elf_sym_sect;
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static int32_t elf_gottpoff_sect;
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static void elf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
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{
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maxbits = 64;
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elffp = fp;
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error = errfunc;
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evaluate = eval;
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(void)ldef; /* placate optimisers */
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sects = NULL;
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nsects = sectlen = 0;
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syms = saa_init((int32_t)sizeof(struct Symbol));
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nlocals = nglobs = 0;
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bsym = raa_init();
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strs = saa_init(1L);
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saa_wbytes(strs, "\0", 1L);
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saa_wbytes(strs, elf_module, (int32_t)(strlen(elf_module) + 1));
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strslen = 2 + strlen(elf_module);
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shstrtab = NULL;
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shstrtablen = shstrtabsize = 0;;
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add_sectname("", "");
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fwds = NULL;
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elf_gotpc_sect = seg_alloc();
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ldef("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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elf_gotoff_sect = seg_alloc();
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ldef("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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elf_got_sect = seg_alloc();
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ldef("..got", elf_got_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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elf_plt_sect = seg_alloc();
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ldef("..plt", elf_plt_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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elf_sym_sect = seg_alloc();
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ldef("..sym", elf_sym_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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elf_gottpoff_sect = seg_alloc();
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ldef("..gottpoff", elf_gottpoff_sect + 1, 0L, NULL, false, false, &of_elf64,
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error);
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def_seg = seg_alloc();
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}
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static void elf_cleanup(int debuginfo)
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{
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struct Reloc *r;
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int i;
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|
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(void)debuginfo;
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|
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elf_write();
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fclose(elffp);
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for (i = 0; i < nsects; i++) {
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if (sects[i]->type != SHT_NOBITS)
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saa_free(sects[i]->data);
|
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if (sects[i]->head)
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saa_free(sects[i]->rel);
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while (sects[i]->head) {
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r = sects[i]->head;
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sects[i]->head = sects[i]->head->next;
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nasm_free(r);
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}
|
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}
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nasm_free(sects);
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saa_free(syms);
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raa_free(bsym);
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saa_free(strs);
|
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if (of_elf64.current_dfmt) {
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of_elf64.current_dfmt->cleanup();
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}
|
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}
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/* add entry to the elf .shstrtab section */
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static void add_sectname(char *firsthalf, char *secondhalf)
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{
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int len = strlen(firsthalf) + strlen(secondhalf);
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while (shstrtablen + len + 1 > shstrtabsize)
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shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
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strcpy(shstrtab + shstrtablen, firsthalf);
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strcat(shstrtab + shstrtablen, secondhalf);
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shstrtablen += len + 1;
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}
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||
|
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static int elf_make_section(char *name, int type, int flags, int align)
|
||
{
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struct Section *s;
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|
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s = nasm_malloc(sizeof(*s));
|
||
|
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if (type != SHT_NOBITS)
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s->data = saa_init(1L);
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s->head = NULL;
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s->tail = &s->head;
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s->len = s->size = 0;
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||
s->nrelocs = 0;
|
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if (!strcmp(name, ".text"))
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s->index = def_seg;
|
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else
|
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s->index = seg_alloc();
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add_sectname("", name);
|
||
s->name = nasm_malloc(1 + strlen(name));
|
||
strcpy(s->name, name);
|
||
s->type = type;
|
||
s->flags = flags;
|
||
s->align = align;
|
||
s->gsyms = NULL;
|
||
|
||
if (nsects >= sectlen)
|
||
sects =
|
||
nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
|
||
sects[nsects++] = s;
|
||
|
||
return nsects - 1;
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}
|
||
|
||
static int32_t elf_section_names(char *name, int pass, int *bits)
|
||
{
|
||
char *p;
|
||
unsigned flags_and, flags_or;
|
||
uint64_t type, align;
|
||
int i;
|
||
|
||
/*
|
||
* Default is 64 bits.
|
||
*/
|
||
if (!name) {
|
||
*bits = 64;
|
||
return def_seg;
|
||
}
|
||
|
||
p = name;
|
||
while (*p && !nasm_isspace(*p))
|
||
p++;
|
||
if (*p)
|
||
*p++ = '\0';
|
||
flags_and = flags_or = type = align = 0;
|
||
|
||
while (*p && nasm_isspace(*p))
|
||
p++;
|
||
while (*p) {
|
||
char *q = p;
|
||
while (*p && !nasm_isspace(*p))
|
||
p++;
|
||
if (*p)
|
||
*p++ = '\0';
|
||
while (*p && nasm_isspace(*p))
|
||
p++;
|
||
|
||
if (!nasm_strnicmp(q, "align=", 6)) {
|
||
align = atoi(q + 6);
|
||
if (align == 0)
|
||
align = 1;
|
||
if ((align - 1) & align) { /* means it's not a power of two */
|
||
error(ERR_NONFATAL, "section alignment %d is not"
|
||
" a power of two", align);
|
||
align = 1;
|
||
}
|
||
} else if (!nasm_stricmp(q, "alloc")) {
|
||
flags_and |= SHF_ALLOC;
|
||
flags_or |= SHF_ALLOC;
|
||
} else if (!nasm_stricmp(q, "noalloc")) {
|
||
flags_and |= SHF_ALLOC;
|
||
flags_or &= ~SHF_ALLOC;
|
||
} else if (!nasm_stricmp(q, "exec")) {
|
||
flags_and |= SHF_EXECINSTR;
|
||
flags_or |= SHF_EXECINSTR;
|
||
} else if (!nasm_stricmp(q, "noexec")) {
|
||
flags_and |= SHF_EXECINSTR;
|
||
flags_or &= ~SHF_EXECINSTR;
|
||
} else if (!nasm_stricmp(q, "write")) {
|
||
flags_and |= SHF_WRITE;
|
||
flags_or |= SHF_WRITE;
|
||
} else if (!nasm_stricmp(q, "tls")) {
|
||
flags_and |= SHF_TLS;
|
||
flags_or |= SHF_TLS;
|
||
} else if (!nasm_stricmp(q, "nowrite")) {
|
||
flags_and |= SHF_WRITE;
|
||
flags_or &= ~SHF_WRITE;
|
||
} else if (!nasm_stricmp(q, "progbits")) {
|
||
type = SHT_PROGBITS;
|
||
} else if (!nasm_stricmp(q, "nobits")) {
|
||
type = SHT_NOBITS;
|
||
} else if (pass == 1) error(ERR_WARNING, "Unknown section attribute '%s' ignored on"
|
||
" declaration of section `%s'", q, name);
|
||
}
|
||
|
||
if (!strcmp(name, ".comment") ||
|
||
!strcmp(name, ".shstrtab") ||
|
||
!strcmp(name, ".symtab") || !strcmp(name, ".strtab")) {
|
||
error(ERR_NONFATAL, "attempt to redefine reserved section"
|
||
"name `%s'", name);
|
||
return NO_SEG;
|
||
}
|
||
|
||
for (i = 0; i < nsects; i++)
|
||
if (!strcmp(name, sects[i]->name))
|
||
break;
|
||
if (i == nsects) {
|
||
if (!strcmp(name, ".text"))
|
||
i = elf_make_section(name, SHT_PROGBITS,
|
||
SHF_ALLOC | SHF_EXECINSTR, 16);
|
||
else if (!strcmp(name, ".rodata"))
|
||
i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 4);
|
||
else if (!strcmp(name, ".data"))
|
||
i = elf_make_section(name, SHT_PROGBITS,
|
||
SHF_ALLOC | SHF_WRITE, 4);
|
||
else if (!strcmp(name, ".bss"))
|
||
i = elf_make_section(name, SHT_NOBITS,
|
||
SHF_ALLOC | SHF_WRITE, 4);
|
||
else if (!strcmp(name, ".tdata"))
|
||
i = elf_make_section(name, SHT_PROGBITS,
|
||
SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
|
||
else if (!strcmp(name, ".tbss"))
|
||
i = elf_make_section(name, SHT_NOBITS,
|
||
SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
|
||
else
|
||
i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 1);
|
||
if (type)
|
||
sects[i]->type = type;
|
||
if (align)
|
||
sects[i]->align = align;
|
||
sects[i]->flags &= ~flags_and;
|
||
sects[i]->flags |= flags_or;
|
||
} else if (pass == 1) {
|
||
if ((type && sects[i]->type != type)
|
||
|| (align && sects[i]->align != align)
|
||
|| (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
|
||
error(ERR_WARNING, "incompatible section attributes ignored on"
|
||
" redeclaration of section `%s'", name);
|
||
}
|
||
|
||
return sects[i]->index;
|
||
}
|
||
|
||
static void elf_deflabel(char *name, int32_t segment, int64_t offset,
|
||
int is_global, char *special)
|
||
{
|
||
int pos = strslen;
|
||
struct Symbol *sym;
|
||
bool special_used = false;
|
||
|
||
#if defined(DEBUG) && DEBUG>2
|
||
fprintf(stderr,
|
||
" elf_deflabel: %s, seg=%x, off=%x, is_global=%d, %s\n",
|
||
name, segment, offset, is_global, special);
|
||
#endif
|
||
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
|
||
/*
|
||
* This is a NASM special symbol. We never allow it into
|
||
* the ELF symbol table, even if it's a valid one. If it
|
||
* _isn't_ a valid one, we should barf immediately.
|
||
*/
|
||
if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
|
||
strcmp(name, "..got") && strcmp(name, "..plt") &&
|
||
strcmp(name, "..sym") && strcmp(name, "..gottpoff"))
|
||
error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
|
||
return;
|
||
}
|
||
|
||
if (is_global == 3) {
|
||
struct Symbol **s;
|
||
/*
|
||
* Fix up a forward-reference symbol size from the first
|
||
* pass.
|
||
*/
|
||
for (s = &fwds; *s; s = &(*s)->nextfwd)
|
||
if (!strcmp((*s)->name, name)) {
|
||
struct tokenval tokval;
|
||
expr *e;
|
||
char *p = special;
|
||
|
||
while (*p && !nasm_isspace(*p))
|
||
p++;
|
||
while (*p && nasm_isspace(*p))
|
||
p++;
|
||
stdscan_reset();
|
||
stdscan_bufptr = p;
|
||
tokval.t_type = TOKEN_INVALID;
|
||
e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
|
||
if (e) {
|
||
if (!is_simple(e))
|
||
error(ERR_NONFATAL, "cannot use relocatable"
|
||
" expression as symbol size");
|
||
else
|
||
(*s)->size = reloc_value(e);
|
||
}
|
||
|
||
/*
|
||
* Remove it from the list of unresolved sizes.
|
||
*/
|
||
nasm_free((*s)->name);
|
||
*s = (*s)->nextfwd;
|
||
return;
|
||
}
|
||
return; /* it wasn't an important one */
|
||
}
|
||
|
||
saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
|
||
strslen += 1 + strlen(name);
|
||
|
||
lastsym = sym = saa_wstruct(syms);
|
||
|
||
memset(&sym->symv, 0, sizeof(struct rbtree));
|
||
|
||
sym->strpos = pos;
|
||
sym->type = is_global ? SYM_GLOBAL : 0;
|
||
sym->other = STV_DEFAULT;
|
||
sym->size = 0;
|
||
if (segment == NO_SEG)
|
||
sym->section = SHN_ABS;
|
||
else {
|
||
int i;
|
||
sym->section = SHN_UNDEF;
|
||
if (nsects == 0 && segment == def_seg) {
|
||
int tempint;
|
||
if (segment != elf_section_names(".text", 2, &tempint))
|
||
error(ERR_PANIC,
|
||
"strange segment conditions in ELF driver");
|
||
sym->section = nsects;
|
||
} else {
|
||
for (i = 0; i < nsects; i++)
|
||
if (segment == sects[i]->index) {
|
||
sym->section = i + 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (is_global == 2) {
|
||
sym->size = offset;
|
||
sym->symv.key = 0;
|
||
sym->section = SHN_COMMON;
|
||
/*
|
||
* We have a common variable. Check the special text to see
|
||
* if it's a valid number and power of two; if so, store it
|
||
* as the alignment for the common variable.
|
||
*/
|
||
if (special) {
|
||
bool err;
|
||
sym->symv.key = readnum(special, &err);
|
||
if (err)
|
||
error(ERR_NONFATAL, "alignment constraint `%s' is not a"
|
||
" valid number", special);
|
||
else if ((sym->symv.key | (sym->symv.key - 1))
|
||
!= 2 * sym->symv.key - 1)
|
||
error(ERR_NONFATAL, "alignment constraint `%s' is not a"
|
||
" power of two", special);
|
||
}
|
||
special_used = true;
|
||
} else
|
||
sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
|
||
|
||
if (sym->type == SYM_GLOBAL) {
|
||
/*
|
||
* If sym->section == SHN_ABS, then the first line of the
|
||
* else section would cause a core dump, because its a reference
|
||
* beyond the end of the section array.
|
||
* This behaviour is exhibited by this code:
|
||
* GLOBAL crash_nasm
|
||
* crash_nasm equ 0
|
||
* To avoid such a crash, such requests are silently discarded.
|
||
* This may not be the best solution.
|
||
*/
|
||
if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
|
||
bsym = raa_write(bsym, segment, nglobs);
|
||
} else if (sym->section != SHN_ABS) {
|
||
/*
|
||
* This is a global symbol; so we must add it to the rbtree
|
||
* of global symbols in its section.
|
||
*
|
||
* In addition, we check the special text for symbol
|
||
* type and size information.
|
||
*/
|
||
sects[sym->section-1]->gsyms =
|
||
rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
|
||
|
||
if (special) {
|
||
int n = strcspn(special, " \t");
|
||
|
||
if (!nasm_strnicmp(special, "function", n))
|
||
sym->type |= STT_FUNC;
|
||
else if (!nasm_strnicmp(special, "data", n) ||
|
||
!nasm_strnicmp(special, "object", n))
|
||
sym->type |= STT_OBJECT;
|
||
else if (!nasm_strnicmp(special, "notype", n))
|
||
sym->type |= STT_NOTYPE;
|
||
else
|
||
error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
|
||
n, special);
|
||
special += n;
|
||
|
||
while (nasm_isspace(*special))
|
||
++special;
|
||
if (*special) {
|
||
n = strcspn(special, " \t");
|
||
if (!nasm_strnicmp(special, "default", n))
|
||
sym->other = STV_DEFAULT;
|
||
else if (!nasm_strnicmp(special, "internal", n))
|
||
sym->other = STV_INTERNAL;
|
||
else if (!nasm_strnicmp(special, "hidden", n))
|
||
sym->other = STV_HIDDEN;
|
||
else if (!nasm_strnicmp(special, "protected", n))
|
||
sym->other = STV_PROTECTED;
|
||
else
|
||
n = 0;
|
||
special += n;
|
||
}
|
||
|
||
if (*special) {
|
||
struct tokenval tokval;
|
||
expr *e;
|
||
int fwd = 0;
|
||
char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
|
||
|
||
while (special[n] && nasm_isspace(special[n]))
|
||
n++;
|
||
/*
|
||
* We have a size expression; attempt to
|
||
* evaluate it.
|
||
*/
|
||
stdscan_reset();
|
||
stdscan_bufptr = special + n;
|
||
tokval.t_type = TOKEN_INVALID;
|
||
e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error,
|
||
NULL);
|
||
if (fwd) {
|
||
sym->nextfwd = fwds;
|
||
fwds = sym;
|
||
sym->name = nasm_strdup(name);
|
||
} else if (e) {
|
||
if (!is_simple(e))
|
||
error(ERR_NONFATAL, "cannot use relocatable"
|
||
" expression as symbol size");
|
||
else
|
||
sym->size = reloc_value(e);
|
||
}
|
||
stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
|
||
}
|
||
special_used = true;
|
||
}
|
||
/*
|
||
* If TLS segment, mark symbol accordingly.
|
||
*/
|
||
if (sects[sym->section - 1]->flags & SHF_TLS) {
|
||
sym->type &= 0xf0;
|
||
sym->type |= STT_TLS;
|
||
}
|
||
}
|
||
sym->globnum = nglobs;
|
||
nglobs++;
|
||
} else
|
||
nlocals++;
|
||
|
||
if (special && !special_used)
|
||
error(ERR_NONFATAL, "no special symbol features supported here");
|
||
}
|
||
|
||
static void elf_add_reloc(struct Section *sect, int32_t segment,
|
||
int64_t offset, int type)
|
||
{
|
||
struct Reloc *r;
|
||
r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
|
||
sect->tail = &r->next;
|
||
r->next = NULL;
|
||
|
||
r->address = sect->len;
|
||
r->offset = offset;
|
||
if (segment == NO_SEG)
|
||
r->symbol = 0;
|
||
else {
|
||
int i;
|
||
r->symbol = 0;
|
||
for (i = 0; i < nsects; i++)
|
||
if (segment == sects[i]->index)
|
||
r->symbol = i + 2;
|
||
if (!r->symbol)
|
||
r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
|
||
}
|
||
r->type = type;
|
||
|
||
sect->nrelocs++;
|
||
}
|
||
|
||
/*
|
||
* This routine deals with ..got and ..sym relocations: the more
|
||
* complicated kinds. In shared-library writing, some relocations
|
||
* with respect to global symbols must refer to the precise symbol
|
||
* rather than referring to an offset from the base of the section
|
||
* _containing_ the symbol. Such relocations call to this routine,
|
||
* which searches the symbol list for the symbol in question.
|
||
*
|
||
* R_386_GOT32 references require the _exact_ symbol address to be
|
||
* used; R_386_32 references can be at an offset from the symbol.
|
||
* The boolean argument `exact' tells us this.
|
||
*
|
||
* Return value is the adjusted value of `addr', having become an
|
||
* offset from the symbol rather than the section. Should always be
|
||
* zero when returning from an exact call.
|
||
*
|
||
* Limitation: if you define two symbols at the same place,
|
||
* confusion will occur.
|
||
*
|
||
* Inefficiency: we search, currently, using a linked list which
|
||
* isn't even necessarily sorted.
|
||
*/
|
||
static void elf_add_gsym_reloc(struct Section *sect,
|
||
int32_t segment, uint64_t offset, int64_t pcrel,
|
||
int type, bool exact)
|
||
{
|
||
struct Reloc *r;
|
||
struct Section *s;
|
||
struct Symbol *sym;
|
||
struct rbtree *srb;
|
||
int i;
|
||
|
||
/*
|
||
* First look up the segment/offset pair and find a global
|
||
* symbol corresponding to it. If it's not one of our segments,
|
||
* then it must be an external symbol, in which case we're fine
|
||
* doing a normal elf_add_reloc after first sanity-checking
|
||
* that the offset from the symbol is zero.
|
||
*/
|
||
s = NULL;
|
||
for (i = 0; i < nsects; i++)
|
||
if (segment == sects[i]->index) {
|
||
s = sects[i];
|
||
break;
|
||
}
|
||
|
||
if (!s) {
|
||
if (exact && offset)
|
||
error(ERR_NONFATAL, "invalid access to an external symbol");
|
||
else
|
||
elf_add_reloc(sect, segment, offset - pcrel, type);
|
||
return;
|
||
}
|
||
|
||
srb = rb_search(s->gsyms, offset);
|
||
if (!srb || (exact && srb->key != offset)) {
|
||
error(ERR_NONFATAL, "unable to find a suitable global symbol"
|
||
" for this reference");
|
||
return;
|
||
}
|
||
sym = container_of(srb, struct Symbol, symv);
|
||
|
||
r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
|
||
sect->tail = &r->next;
|
||
r->next = NULL;
|
||
|
||
r->address = sect->len;
|
||
r->offset = offset - pcrel - sym->symv.key;
|
||
r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
|
||
r->type = type;
|
||
|
||
sect->nrelocs++;
|
||
}
|
||
|
||
static void elf_out(int32_t segto, const void *data,
|
||
enum out_type type, uint64_t size,
|
||
int32_t segment, int32_t wrt)
|
||
{
|
||
struct Section *s;
|
||
int64_t addr, zero;
|
||
int i;
|
||
static struct symlininfo sinfo;
|
||
|
||
zero = 0;
|
||
|
||
#if defined(DEBUG) && DEBUG>2
|
||
if (data) fprintf(stderr,
|
||
" elf_out line: %d type: %x seg: %d segto: %d bytes: %x data: %"PRIx64"\n",
|
||
currentline, type, segment, segto, size, *(int64_t *)data);
|
||
else fprintf(stderr,
|
||
" elf_out line: %d type: %x seg: %d segto: %d bytes: %x\n",
|
||
currentline, type, segment, segto, size);
|
||
#endif
|
||
|
||
/*
|
||
* handle absolute-assembly (structure definitions)
|
||
*/
|
||
if (segto == NO_SEG) {
|
||
if (type != OUT_RESERVE)
|
||
error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
|
||
" space");
|
||
return;
|
||
}
|
||
|
||
s = NULL;
|
||
for (i = 0; i < nsects; i++)
|
||
if (segto == sects[i]->index) {
|
||
s = sects[i];
|
||
break;
|
||
}
|
||
if (!s) {
|
||
int tempint; /* ignored */
|
||
if (segto != elf_section_names(".text", 2, &tempint))
|
||
error(ERR_PANIC, "strange segment conditions in ELF driver");
|
||
else {
|
||
s = sects[nsects - 1];
|
||
i = nsects - 1;
|
||
}
|
||
}
|
||
/* invoke current debug_output routine */
|
||
if (of_elf64.current_dfmt) {
|
||
sinfo.offset = s->len;
|
||
sinfo.section = i;
|
||
sinfo.segto = segto;
|
||
sinfo.name = s->name;
|
||
of_elf64.current_dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo);
|
||
}
|
||
/* end of debugging stuff */
|
||
|
||
if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
|
||
error(ERR_WARNING, "attempt to initialize memory in"
|
||
" BSS section `%s': ignored", s->name);
|
||
s->len += realsize(type, size);
|
||
return;
|
||
}
|
||
|
||
if (type == OUT_RESERVE) {
|
||
if (s->type == SHT_PROGBITS) {
|
||
error(ERR_WARNING, "uninitialized space declared in"
|
||
" non-BSS section `%s': zeroing", s->name);
|
||
elf_sect_write(s, NULL, size);
|
||
} else
|
||
s->len += size;
|
||
} else if (type == OUT_RAWDATA) {
|
||
if (segment != NO_SEG)
|
||
error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
|
||
elf_sect_write(s, data, size);
|
||
} else if (type == OUT_ADDRESS) {
|
||
addr = *(int64_t *)data;
|
||
if (segment == NO_SEG) {
|
||
/* Do nothing */
|
||
} else if (segment % 2) {
|
||
error(ERR_NONFATAL, "ELF format does not support"
|
||
" segment base references");
|
||
} else {
|
||
if (wrt == NO_SEG) {
|
||
switch ((int)size) {
|
||
case 1:
|
||
elf_add_reloc(s, segment, addr, R_X86_64_8);
|
||
break;
|
||
case 2:
|
||
elf_add_reloc(s, segment, addr, R_X86_64_16);
|
||
break;
|
||
case 4:
|
||
elf_add_reloc(s, segment, addr, R_X86_64_32);
|
||
break;
|
||
case 8:
|
||
elf_add_reloc(s, segment, addr, R_X86_64_64);
|
||
break;
|
||
default:
|
||
error(ERR_PANIC, "internal error elf64-hpa-871");
|
||
break;
|
||
}
|
||
addr = 0;
|
||
} else if (wrt == elf_gotpc_sect + 1) {
|
||
/*
|
||
* The user will supply GOT relative to $$. ELF
|
||
* will let us have GOT relative to $. So we
|
||
* need to fix up the data item by $-$$.
|
||
*/
|
||
addr += s->len;
|
||
elf_add_reloc(s, segment, addr, R_X86_64_GOTPC32);
|
||
addr = 0;
|
||
} else if (wrt == elf_gotoff_sect + 1) {
|
||
if (size != 8) {
|
||
error(ERR_NONFATAL, "ELF64 requires ..gotoff "
|
||
"references to be qword");
|
||
} else {
|
||
elf_add_reloc(s, segment, addr, R_X86_64_GOTOFF64);
|
||
addr = 0;
|
||
}
|
||
} else if (wrt == elf_got_sect + 1) {
|
||
switch ((int)size) {
|
||
case 4:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_GOT32, true);
|
||
addr = 0;
|
||
break;
|
||
case 8:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_GOT64, true);
|
||
addr = 0;
|
||
break;
|
||
default:
|
||
error(ERR_NONFATAL, "invalid ..got reference");
|
||
break;
|
||
}
|
||
} else if (wrt == elf_sym_sect + 1) {
|
||
switch ((int)size) {
|
||
case 1:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_8, false);
|
||
addr = 0;
|
||
break;
|
||
case 2:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_16, false);
|
||
addr = 0;
|
||
break;
|
||
case 4:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_32, false);
|
||
addr = 0;
|
||
break;
|
||
case 8:
|
||
elf_add_gsym_reloc(s, segment, addr, 0,
|
||
R_X86_64_64, false);
|
||
addr = 0;
|
||
break;
|
||
default:
|
||
error(ERR_PANIC, "internal error elf64-hpa-903");
|
||
break;
|
||
}
|
||
} else if (wrt == elf_plt_sect + 1) {
|
||
error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
|
||
"relative PLT references");
|
||
} else {
|
||
error(ERR_NONFATAL, "ELF format does not support this"
|
||
" use of WRT");
|
||
}
|
||
}
|
||
elf_sect_writeaddr(s, addr, size);
|
||
} else if (type == OUT_REL2ADR) {
|
||
addr = *(int64_t *)data - size;
|
||
if (segment == segto)
|
||
error(ERR_PANIC, "intra-segment OUT_REL2ADR");
|
||
if (segment == NO_SEG) {
|
||
/* Do nothing */
|
||
} else if (segment % 2) {
|
||
error(ERR_NONFATAL, "ELF format does not support"
|
||
" segment base references");
|
||
} else {
|
||
if (wrt == NO_SEG) {
|
||
elf_add_reloc(s, segment, addr, R_X86_64_PC16);
|
||
addr = 0;
|
||
} else {
|
||
error(ERR_NONFATAL,
|
||
"Unsupported non-32-bit ELF relocation [2]");
|
||
}
|
||
}
|
||
elf_sect_writeaddr(s, addr, 2);
|
||
} else if (type == OUT_REL4ADR) {
|
||
addr = *(int64_t *)data - size;
|
||
if (segment == segto)
|
||
error(ERR_PANIC, "intra-segment OUT_REL4ADR");
|
||
if (segment == NO_SEG) {
|
||
/* Do nothing */
|
||
} else if (segment % 2) {
|
||
error(ERR_NONFATAL, "ELF64 format does not support"
|
||
" segment base references");
|
||
} else {
|
||
if (wrt == NO_SEG) {
|
||
elf_add_reloc(s, segment, addr, R_X86_64_PC32);
|
||
addr = 0;
|
||
} else if (wrt == elf_plt_sect + 1) {
|
||
elf_add_gsym_reloc(s, segment, addr+size, size,
|
||
R_X86_64_PLT32, true);
|
||
addr = 0;
|
||
} else if (wrt == elf_gotpc_sect + 1 ||
|
||
wrt == elf_got_sect + 1) {
|
||
elf_add_gsym_reloc(s, segment, addr+size, size,
|
||
R_X86_64_GOTPCREL, true);
|
||
addr = 0;
|
||
} else if (wrt == elf_gotoff_sect + 1 ||
|
||
wrt == elf_got_sect + 1) {
|
||
error(ERR_NONFATAL, "ELF64 requires ..gotoff references to be "
|
||
"qword absolute");
|
||
} else if (wrt == elf_gottpoff_sect + 1) {
|
||
elf_add_gsym_reloc(s, segment, addr+size, size,
|
||
R_X86_64_GOTTPOFF, true);
|
||
addr = 0;
|
||
} else {
|
||
error(ERR_NONFATAL, "ELF64 format does not support this"
|
||
" use of WRT");
|
||
}
|
||
}
|
||
elf_sect_writeaddr(s, addr, 4);
|
||
} else if (type == OUT_REL8ADR) {
|
||
addr = *(int64_t *)data - size;
|
||
if (segment == segto)
|
||
error(ERR_PANIC, "intra-segment OUT_REL8ADR");
|
||
if (segment == NO_SEG) {
|
||
/* Do nothing */
|
||
} else if (segment % 2) {
|
||
error(ERR_NONFATAL, "ELF64 format does not support"
|
||
" segment base references");
|
||
} else {
|
||
if (wrt == NO_SEG) {
|
||
elf_add_reloc(s, segment, addr, R_X86_64_PC64);
|
||
addr = 0;
|
||
} else if (wrt == elf_gotpc_sect + 1 ||
|
||
wrt == elf_got_sect + 1) {
|
||
elf_add_gsym_reloc(s, segment, addr+size, size,
|
||
R_X86_64_GOTPCREL64, true);
|
||
addr = 0;
|
||
} else if (wrt == elf_gotoff_sect + 1 ||
|
||
wrt == elf_got_sect + 1) {
|
||
error(ERR_NONFATAL, "ELF64 requires ..gotoff references to be "
|
||
"absolute");
|
||
} else if (wrt == elf_gottpoff_sect + 1) {
|
||
error(ERR_NONFATAL, "ELF64 requires ..gottpoff references to be "
|
||
"dword");
|
||
} else {
|
||
error(ERR_NONFATAL, "ELF64 format does not support this"
|
||
" use of WRT");
|
||
}
|
||
}
|
||
elf_sect_writeaddr(s, addr, 8);
|
||
}
|
||
}
|
||
|
||
static void elf_write(void)
|
||
{
|
||
int align;
|
||
int scount;
|
||
char *p;
|
||
int commlen;
|
||
char comment[64];
|
||
int i;
|
||
|
||
struct SAA *symtab;
|
||
int32_t symtablen, symtablocal;
|
||
|
||
/*
|
||
* Work out how many sections we will have. We have SHN_UNDEF,
|
||
* then the flexible user sections, then the four fixed
|
||
* sections `.comment', `.shstrtab', `.symtab' and `.strtab',
|
||
* then optionally relocation sections for the user sections.
|
||
*/
|
||
if (of_elf64.current_dfmt == &df_stabs)
|
||
nsections = 8;
|
||
else if (of_elf64.current_dfmt == &df_dwarf)
|
||
nsections = 15;
|
||
else
|
||
nsections = 5; /* SHN_UNDEF and the fixed ones */
|
||
|
||
add_sectname("", ".comment");
|
||
add_sectname("", ".shstrtab");
|
||
add_sectname("", ".symtab");
|
||
add_sectname("", ".strtab");
|
||
for (i = 0; i < nsects; i++) {
|
||
nsections++; /* for the section itself */
|
||
if (sects[i]->head) {
|
||
nsections++; /* for its relocations */
|
||
add_sectname(".rela", sects[i]->name);
|
||
}
|
||
}
|
||
|
||
if (of_elf64.current_dfmt == &df_stabs) {
|
||
/* in case the debug information is wanted, just add these three sections... */
|
||
add_sectname("", ".stab");
|
||
add_sectname("", ".stabstr");
|
||
add_sectname(".rel", ".stab");
|
||
}
|
||
|
||
else if (of_elf64.current_dfmt == &df_dwarf) {
|
||
/* the dwarf debug standard specifies the following ten sections,
|
||
not all of which are currently implemented,
|
||
although all of them are defined. */
|
||
#define debug_aranges (int64_t) (nsections-10)
|
||
#define debug_info (int64_t) (nsections-7)
|
||
#define debug_abbrev (int64_t) (nsections-5)
|
||
#define debug_line (int64_t) (nsections-4)
|
||
add_sectname("", ".debug_aranges");
|
||
add_sectname(".rela", ".debug_aranges");
|
||
add_sectname("", ".debug_pubnames");
|
||
add_sectname("", ".debug_info");
|
||
add_sectname(".rela", ".debug_info");
|
||
add_sectname("", ".debug_abbrev");
|
||
add_sectname("", ".debug_line");
|
||
add_sectname(".rela", ".debug_line");
|
||
add_sectname("", ".debug_frame");
|
||
add_sectname("", ".debug_loc");
|
||
}
|
||
|
||
/*
|
||
* Do the comment.
|
||
*/
|
||
*comment = '\0';
|
||
commlen = 2 + snprintf(comment+1, sizeof comment-1, "%s", nasm_comment);
|
||
|
||
/*
|
||
* Output the ELF header.
|
||
*/
|
||
fwrite("\177ELF\2\1\1", 7, 1, elffp);
|
||
fputc(elf_osabi, elffp);
|
||
fputc(elf_abiver, elffp);
|
||
fwritezero(7, elffp);
|
||
fwriteint16_t(ET_REL, elffp); /* relocatable file */
|
||
fwriteint16_t(EM_X86_64, elffp); /* processor ID */
|
||
fwriteint32_t(1L, elffp); /* EV_CURRENT file format version */
|
||
fwriteint64_t(0L, elffp); /* no entry point */
|
||
fwriteint64_t(0L, elffp); /* no program header table */
|
||
fwriteint64_t(0x40L, elffp); /* section headers straight after
|
||
* ELF header plus alignment */
|
||
fwriteint32_t(0L, elffp); /* 386 defines no special flags */
|
||
fwriteint16_t(0x40, elffp); /* size of ELF header */
|
||
fwriteint16_t(0, elffp); /* no program header table, again */
|
||
fwriteint16_t(0, elffp); /* still no program header table */
|
||
fwriteint16_t(sizeof(Elf64_Shdr), elffp); /* size of section header */
|
||
fwriteint16_t(nsections, elffp); /* number of sections */
|
||
fwriteint16_t(nsects + 2, elffp); /* string table section index for
|
||
* section header table */
|
||
|
||
/*
|
||
* Build the symbol table and relocation tables.
|
||
*/
|
||
symtab = elf_build_symtab(&symtablen, &symtablocal);
|
||
for (i = 0; i < nsects; i++)
|
||
if (sects[i]->head)
|
||
sects[i]->rel = elf_build_reltab(§s[i]->rellen,
|
||
sects[i]->head);
|
||
|
||
/*
|
||
* Now output the section header table.
|
||
*/
|
||
|
||
elf_foffs = 0x40 + sizeof(Elf64_Shdr) * nsections;
|
||
align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
|
||
elf_foffs += align;
|
||
elf_nsect = 0;
|
||
elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
|
||
elf_section_header(0, 0, 0, NULL, false, 0L, 0, 0, 0, 0); /* SHN_UNDEF */
|
||
scount = 1; /* needed for the stabs debugging to track the symtable section */
|
||
p = shstrtab + 1;
|
||
for (i = 0; i < nsects; i++) {
|
||
elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
|
||
(sects[i]->type == SHT_PROGBITS ?
|
||
sects[i]->data : NULL), true,
|
||
sects[i]->len, 0, 0, sects[i]->align, 0);
|
||
p += strlen(p) + 1;
|
||
scount++; /* ditto */
|
||
}
|
||
elf_section_header(p - shstrtab, 1, 0, comment, false, (int32_t)commlen, 0, 0, 1, 0); /* .comment */
|
||
scount++; /* ditto */
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, 3, 0, shstrtab, false, (int32_t)shstrtablen, 0, 0, 1, 0); /* .shstrtab */
|
||
scount++; /* ditto */
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, 2, 0, symtab, true, symtablen, nsects + 4, symtablocal, 4, 24); /* .symtab */
|
||
symtabsection = scount; /* now we got the symtab section index in the ELF file */
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, 3, 0, strs, true, strslen, 0, 0, 1, 0); /* .strtab */
|
||
for (i = 0; i < nsects; i++)
|
||
if (sects[i]->head) {
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab,SHT_RELA, 0, sects[i]->rel, true,
|
||
sects[i]->rellen, nsects + 3, i + 1, 4, 24);
|
||
}
|
||
if (of_elf64.current_dfmt == &df_stabs) {
|
||
/* for debugging information, create the last three sections
|
||
which are the .stab , .stabstr and .rel.stab sections respectively */
|
||
|
||
/* this function call creates the stab sections in memory */
|
||
stabs64_generate();
|
||
|
||
if ((stabbuf) && (stabstrbuf) && (stabrelbuf)) {
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, 1, 0, stabbuf, false, stablen,
|
||
nsections - 2, 0, 4, 12);
|
||
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, 3, 0, stabstrbuf, false,
|
||
stabstrlen, 0, 0, 4, 0);
|
||
|
||
p += strlen(p) + 1;
|
||
/* link -> symtable info -> section to refer to */
|
||
elf_section_header(p - shstrtab, 9, 0, stabrelbuf, false,
|
||
stabrellen, symtabsection, nsections - 3, 4,
|
||
16);
|
||
}
|
||
}
|
||
else if (of_elf64.current_dfmt == &df_dwarf) {
|
||
/* for dwarf debugging information, create the ten dwarf sections */
|
||
|
||
/* this function call creates the dwarf sections in memory */
|
||
if (dwarf_fsect) dwarf64_generate();
|
||
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
|
||
arangeslen, 0, 0, 1, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
|
||
arangesrellen, symtabsection, debug_aranges, 1, 24);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf, false,
|
||
pubnameslen, 0, 0, 1, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
|
||
infolen, 0, 0, 1, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
|
||
inforellen, symtabsection, debug_info, 1, 24);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
|
||
abbrevlen, 0, 0, 1, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
|
||
linelen, 0, 0, 1, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
|
||
linerellen, symtabsection, debug_line, 1, 24);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
|
||
framelen, 0, 0, 8, 0);
|
||
p += strlen(p) + 1;
|
||
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
|
||
loclen, 0, 0, 1, 0);
|
||
|
||
}
|
||
fwritezero(align, elffp);
|
||
|
||
/*
|
||
* Now output the sections.
|
||
*/
|
||
elf_write_sections();
|
||
|
||
nasm_free(elf_sects);
|
||
saa_free(symtab);
|
||
}
|
||
|
||
static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
|
||
{
|
||
struct SAA *s = saa_init(1L);
|
||
struct Symbol *sym;
|
||
uint8_t entry[24], *p;
|
||
int i;
|
||
|
||
*len = *local = 0;
|
||
|
||
/*
|
||
* First, an all-zeros entry, required by the ELF spec.
|
||
*/
|
||
saa_wbytes(s, NULL, 24L); /* null symbol table entry */
|
||
*len += 24;
|
||
(*local)++;
|
||
|
||
/*
|
||
* Next, an entry for the file name.
|
||
*/
|
||
p = entry;
|
||
WRITELONG(p, 1); /* we know it's 1st entry in strtab */
|
||
WRITESHORT(p, STT_FILE); /* type FILE */
|
||
WRITESHORT(p, SHN_ABS);
|
||
WRITEDLONG(p, (uint64_t) 0); /* no value */
|
||
WRITEDLONG(p, (uint64_t) 0); /* no size either */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
|
||
/*
|
||
* Now some standard symbols defining the segments, for relocation
|
||
* purposes.
|
||
*/
|
||
for (i = 1; i <= nsects; i++) {
|
||
p = entry;
|
||
WRITELONG(p, 0); /* no symbol name */
|
||
WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
|
||
WRITESHORT(p, i); /* section id */
|
||
WRITEDLONG(p, (uint64_t) 0); /* offset zero */
|
||
WRITEDLONG(p, (uint64_t) 0); /* size zero */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
}
|
||
|
||
|
||
/*
|
||
* Now the other local symbols.
|
||
*/
|
||
saa_rewind(syms);
|
||
while ((sym = saa_rstruct(syms))) {
|
||
if (sym->type & SYM_GLOBAL)
|
||
continue;
|
||
p = entry;
|
||
WRITELONG(p, sym->strpos); /* index into symbol string table */
|
||
WRITECHAR(p, sym->type); /* type and binding */
|
||
WRITECHAR(p, sym->other); /* visibility */
|
||
WRITESHORT(p, sym->section); /* index into section header table */
|
||
WRITEDLONG(p, (int64_t)sym->symv.key); /* value of symbol */
|
||
WRITEDLONG(p, (int64_t)sym->size); /* size of symbol */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
}
|
||
/*
|
||
* dwarf needs symbols for debug sections
|
||
* which are relocation targets.
|
||
*/
|
||
if (of_elf64.current_dfmt == &df_dwarf) {
|
||
dwarf_infosym = *local;
|
||
p = entry;
|
||
WRITELONG(p, 0); /* no symbol name */
|
||
WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
|
||
WRITESHORT(p, debug_info); /* section id */
|
||
WRITEDLONG(p, (uint64_t) 0); /* offset zero */
|
||
WRITEDLONG(p, (uint64_t) 0); /* size zero */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
dwarf_abbrevsym = *local;
|
||
p = entry;
|
||
WRITELONG(p, 0); /* no symbol name */
|
||
WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
|
||
WRITESHORT(p, debug_abbrev); /* section id */
|
||
WRITEDLONG(p, (uint64_t) 0); /* offset zero */
|
||
WRITEDLONG(p, (uint64_t) 0); /* size zero */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
dwarf_linesym = *local;
|
||
p = entry;
|
||
WRITELONG(p, 0); /* no symbol name */
|
||
WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
|
||
WRITESHORT(p, debug_line); /* section id */
|
||
WRITEDLONG(p, (uint64_t) 0); /* offset zero */
|
||
WRITEDLONG(p, (uint64_t) 0); /* size zero */
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
(*local)++;
|
||
}
|
||
|
||
/*
|
||
* Now the global symbols.
|
||
*/
|
||
saa_rewind(syms);
|
||
while ((sym = saa_rstruct(syms))) {
|
||
if (!(sym->type & SYM_GLOBAL))
|
||
continue;
|
||
p = entry;
|
||
WRITELONG(p, sym->strpos);
|
||
WRITECHAR(p, sym->type); /* type and binding */
|
||
WRITECHAR(p, sym->other); /* visibility */
|
||
WRITESHORT(p, sym->section);
|
||
WRITEDLONG(p, (int64_t)sym->symv.key);
|
||
WRITEDLONG(p, (int64_t)sym->size);
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
}
|
||
|
||
return s;
|
||
}
|
||
|
||
static struct SAA *elf_build_reltab(uint64_t *len, struct Reloc *r)
|
||
{
|
||
struct SAA *s;
|
||
uint8_t *p, entry[24];
|
||
|
||
if (!r)
|
||
return NULL;
|
||
|
||
s = saa_init(1L);
|
||
*len = 0;
|
||
|
||
while (r) {
|
||
int64_t sym = r->symbol;
|
||
|
||
if (sym >= GLOBAL_TEMP_BASE)
|
||
{
|
||
if (of_elf64.current_dfmt == &df_dwarf)
|
||
sym += -GLOBAL_TEMP_BASE + (nsects + 5) + nlocals;
|
||
else sym += -GLOBAL_TEMP_BASE + (nsects + 2) + nlocals;
|
||
}
|
||
p = entry;
|
||
WRITEDLONG(p, r->address);
|
||
WRITEDLONG(p, (sym << 32) + r->type);
|
||
WRITEDLONG(p, r->offset);
|
||
saa_wbytes(s, entry, 24L);
|
||
*len += 24;
|
||
|
||
r = r->next;
|
||
}
|
||
|
||
return s;
|
||
}
|
||
|
||
static void elf_section_header(int name, int type, uint64_t flags,
|
||
void *data, bool is_saa, uint64_t datalen,
|
||
int link, int info, int align, int eltsize)
|
||
{
|
||
elf_sects[elf_nsect].data = data;
|
||
elf_sects[elf_nsect].len = datalen;
|
||
elf_sects[elf_nsect].is_saa = is_saa;
|
||
elf_nsect++;
|
||
|
||
fwriteint32_t((int32_t)name, elffp);
|
||
fwriteint32_t((int32_t)type, elffp);
|
||
fwriteint64_t((int64_t)flags, elffp);
|
||
fwriteint64_t(0L, elffp); /* no address, ever, in object files */
|
||
fwriteint64_t(type == 0 ? 0L : elf_foffs, elffp);
|
||
fwriteint64_t(datalen, elffp);
|
||
if (data)
|
||
elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
|
||
fwriteint32_t((int32_t)link, elffp);
|
||
fwriteint32_t((int32_t)info, elffp);
|
||
fwriteint64_t((int64_t)align, elffp);
|
||
fwriteint64_t((int64_t)eltsize, elffp);
|
||
}
|
||
|
||
static void elf_write_sections(void)
|
||
{
|
||
int i;
|
||
for (i = 0; i < elf_nsect; i++)
|
||
if (elf_sects[i].data) {
|
||
int32_t len = elf_sects[i].len;
|
||
int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
|
||
int32_t align = reallen - len;
|
||
if (elf_sects[i].is_saa)
|
||
saa_fpwrite(elf_sects[i].data, elffp);
|
||
else
|
||
fwrite(elf_sects[i].data, len, 1, elffp);
|
||
fwritezero(align, elffp);
|
||
}
|
||
}
|
||
|
||
static void elf_sect_write(struct Section *sect, const void *data, size_t len)
|
||
{
|
||
saa_wbytes(sect->data, data, len);
|
||
sect->len += len;
|
||
}
|
||
static void elf_sect_writeaddr(struct Section *sect, int64_t data, size_t len)
|
||
{
|
||
saa_writeaddr(sect->data, data, len);
|
||
sect->len += len;
|
||
}
|
||
|
||
static int32_t elf_segbase(int32_t segment)
|
||
{
|
||
return segment;
|
||
}
|
||
|
||
static int elf_directive(char *directive, char *value, int pass)
|
||
{
|
||
bool err;
|
||
int64_t n;
|
||
char *p;
|
||
|
||
if (!strcmp(directive, "osabi")) {
|
||
if (pass == 2)
|
||
return 1; /* ignore in pass 2 */
|
||
|
||
n = readnum(value, &err);
|
||
if (err) {
|
||
error(ERR_NONFATAL, "`osabi' directive requires a parameter");
|
||
return 1;
|
||
}
|
||
if (n < 0 || n > 255) {
|
||
error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
|
||
return 1;
|
||
}
|
||
elf_osabi = n;
|
||
elf_abiver = 0;
|
||
|
||
if ((p = strchr(value,',')) == NULL)
|
||
return 1;
|
||
|
||
n = readnum(p+1, &err);
|
||
if (err || n < 0 || n > 255) {
|
||
error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
|
||
return 1;
|
||
}
|
||
|
||
elf_abiver = n;
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void elf_filename(char *inname, char *outname, efunc error)
|
||
{
|
||
strcpy(elf_module, inname);
|
||
standard_extension(inname, outname, ".o", error);
|
||
}
|
||
|
||
extern macros_t elf_stdmac[];
|
||
|
||
static int elf_set_info(enum geninfo type, char **val)
|
||
{
|
||
(void)type;
|
||
(void)val;
|
||
return 0;
|
||
}
|
||
static struct dfmt df_dwarf = {
|
||
"ELF64 (X86_64) dwarf debug format for Linux",
|
||
"dwarf",
|
||
debug64_init,
|
||
dwarf64_linenum,
|
||
debug64_deflabel,
|
||
debug64_directive,
|
||
debug64_typevalue,
|
||
dwarf64_output,
|
||
dwarf64_cleanup
|
||
};
|
||
static struct dfmt df_stabs = {
|
||
"ELF64 (X86_64) stabs debug format for Linux",
|
||
"stabs",
|
||
debug64_init,
|
||
stabs64_linenum,
|
||
debug64_deflabel,
|
||
debug64_directive,
|
||
debug64_typevalue,
|
||
stabs64_output,
|
||
stabs64_cleanup
|
||
};
|
||
|
||
struct dfmt *elf64_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
|
||
|
||
struct ofmt of_elf64 = {
|
||
"ELF64 (x86_64) object files (e.g. Linux)",
|
||
"elf64",
|
||
NULL,
|
||
elf64_debugs_arr,
|
||
&df_stabs,
|
||
elf_stdmac,
|
||
elf_init,
|
||
elf_set_info,
|
||
elf_out,
|
||
elf_deflabel,
|
||
elf_section_names,
|
||
elf_segbase,
|
||
elf_directive,
|
||
elf_filename,
|
||
elf_cleanup
|
||
};
|
||
|
||
/* common debugging routines */
|
||
void debug64_init(struct ofmt *of, void *id, FILE * fp, efunc error)
|
||
{
|
||
(void)of;
|
||
(void)id;
|
||
(void)fp;
|
||
(void)error;
|
||
}
|
||
void debug64_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
|
||
char *special)
|
||
{
|
||
(void)name;
|
||
(void)segment;
|
||
(void)offset;
|
||
(void)is_global;
|
||
(void)special;
|
||
}
|
||
|
||
void debug64_directive(const char *directive, const char *params)
|
||
{
|
||
(void)directive;
|
||
(void)params;
|
||
}
|
||
|
||
void debug64_typevalue(int32_t type)
|
||
{
|
||
int32_t stype, ssize;
|
||
switch (TYM_TYPE(type)) {
|
||
case TY_LABEL:
|
||
ssize = 0;
|
||
stype = STT_NOTYPE;
|
||
break;
|
||
case TY_BYTE:
|
||
ssize = 1;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_WORD:
|
||
ssize = 2;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_DWORD:
|
||
ssize = 4;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_FLOAT:
|
||
ssize = 4;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_QWORD:
|
||
ssize = 8;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_TBYTE:
|
||
ssize = 10;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_OWORD:
|
||
ssize = 16;
|
||
stype = STT_OBJECT;
|
||
break;
|
||
case TY_COMMON:
|
||
ssize = 0;
|
||
stype = STT_COMMON;
|
||
break;
|
||
case TY_SEG:
|
||
ssize = 0;
|
||
stype = STT_SECTION;
|
||
break;
|
||
case TY_EXTERN:
|
||
ssize = 0;
|
||
stype = STT_NOTYPE;
|
||
break;
|
||
case TY_EQU:
|
||
ssize = 0;
|
||
stype = STT_NOTYPE;
|
||
break;
|
||
default:
|
||
ssize = 0;
|
||
stype = STT_NOTYPE;
|
||
break;
|
||
}
|
||
if (stype == STT_OBJECT && lastsym && !lastsym->type) {
|
||
lastsym->size = ssize;
|
||
lastsym->type = stype;
|
||
}
|
||
}
|
||
|
||
/* stabs debugging routines */
|
||
|
||
|
||
void stabs64_linenum(const char *filename, int32_t linenumber, int32_t segto)
|
||
{
|
||
(void)segto;
|
||
if (!stabs_filename) {
|
||
stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
|
||
strcpy(stabs_filename, filename);
|
||
} else {
|
||
if (strcmp(stabs_filename, filename)) {
|
||
/* yep, a memory leak...this program is one-shot anyway, so who cares...
|
||
in fact, this leak comes in quite handy to maintain a list of files
|
||
encountered so far in the symbol lines... */
|
||
|
||
/* why not nasm_free(stabs_filename); we're done with the old one */
|
||
|
||
stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
|
||
strcpy(stabs_filename, filename);
|
||
}
|
||
}
|
||
debug_immcall = 1;
|
||
currentline = linenumber;
|
||
}
|
||
|
||
|
||
void stabs64_output(int type, void *param)
|
||
{
|
||
struct symlininfo *s;
|
||
struct linelist *el;
|
||
if (type == TY_DEBUGSYMLIN) {
|
||
if (debug_immcall) {
|
||
s = (struct symlininfo *)param;
|
||
if (!(sects[s->section]->flags & SHF_EXECINSTR))
|
||
return; /* line info is only collected for executable sections */
|
||
numlinestabs++;
|
||
el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
|
||
el->info.offset = s->offset;
|
||
el->info.section = s->section;
|
||
el->info.name = s->name;
|
||
el->line = currentline;
|
||
el->filename = stabs_filename;
|
||
el->next = 0;
|
||
if (stabslines) {
|
||
stabslines->last->next = el;
|
||
stabslines->last = el;
|
||
} else {
|
||
stabslines = el;
|
||
stabslines->last = el;
|
||
}
|
||
}
|
||
}
|
||
debug_immcall = 0;
|
||
}
|
||
|
||
#define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
|
||
do {\
|
||
WRITELONG(p,n_strx); \
|
||
WRITECHAR(p,n_type); \
|
||
WRITECHAR(p,n_other); \
|
||
WRITESHORT(p,n_desc); \
|
||
WRITELONG(p,n_value); \
|
||
} while (0)
|
||
|
||
/* for creating the .stab , .stabstr and .rel.stab sections in memory */
|
||
|
||
void stabs64_generate(void)
|
||
{
|
||
int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
|
||
uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
|
||
char **allfiles;
|
||
int *fileidx;
|
||
|
||
struct linelist *ptr;
|
||
|
||
ptr = stabslines;
|
||
|
||
allfiles = (char **)nasm_malloc(numlinestabs * sizeof(int8_t *));
|
||
for (i = 0; i < numlinestabs; i++)
|
||
allfiles[i] = 0;
|
||
numfiles = 0;
|
||
while (ptr) {
|
||
if (numfiles == 0) {
|
||
allfiles[0] = ptr->filename;
|
||
numfiles++;
|
||
} else {
|
||
for (i = 0; i < numfiles; i++) {
|
||
if (!strcmp(allfiles[i], ptr->filename))
|
||
break;
|
||
}
|
||
if (i >= numfiles) {
|
||
allfiles[i] = ptr->filename;
|
||
numfiles++;
|
||
}
|
||
}
|
||
ptr = ptr->next;
|
||
}
|
||
strsize = 1;
|
||
fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
|
||
for (i = 0; i < numfiles; i++) {
|
||
fileidx[i] = strsize;
|
||
strsize += strlen(allfiles[i]) + 1;
|
||
}
|
||
mainfileindex = 0;
|
||
for (i = 0; i < numfiles; i++) {
|
||
if (!strcmp(allfiles[i], elf_module)) {
|
||
mainfileindex = i;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* worst case size of the stab buffer would be:
|
||
the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
|
||
*/
|
||
sbuf =
|
||
(uint8_t *)nasm_malloc((numlinestabs * 2 + 3) *
|
||
sizeof(struct stabentry));
|
||
|
||
ssbuf = (uint8_t *)nasm_malloc(strsize);
|
||
|
||
rbuf = (uint8_t *)nasm_malloc(numlinestabs * 16 * (2 + 3));
|
||
rptr = rbuf;
|
||
|
||
for (i = 0; i < numfiles; i++) {
|
||
strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
|
||
}
|
||
ssbuf[0] = 0;
|
||
|
||
stabstrlen = strsize; /* set global variable for length of stab strings */
|
||
|
||
sptr = sbuf;
|
||
ptr = stabslines;
|
||
numstabs = 0;
|
||
|
||
if (ptr) {
|
||
/* this is the first stab, its strx points to the filename of the
|
||
the source-file, the n_desc field should be set to the number
|
||
of remaining stabs
|
||
*/
|
||
WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
|
||
|
||
/* this is the stab for the main source file */
|
||
WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
|
||
|
||
/* relocation table entry */
|
||
|
||
/* Since the symbol table has two entries before */
|
||
/* the section symbols, the index in the info.section */
|
||
/* member must be adjusted by adding 2 */
|
||
|
||
WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
|
||
WRITELONG(rptr, R_X86_64_32);
|
||
WRITELONG(rptr, ptr->info.section + 2);
|
||
|
||
numstabs++;
|
||
currfile = mainfileindex;
|
||
}
|
||
|
||
while (ptr) {
|
||
if (strcmp(allfiles[currfile], ptr->filename)) {
|
||
/* oops file has changed... */
|
||
for (i = 0; i < numfiles; i++)
|
||
if (!strcmp(allfiles[i], ptr->filename))
|
||
break;
|
||
currfile = i;
|
||
WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
|
||
ptr->info.offset);
|
||
numstabs++;
|
||
|
||
/* relocation table entry */
|
||
|
||
WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
|
||
WRITELONG(rptr, R_X86_64_32);
|
||
WRITELONG(rptr, ptr->info.section + 2);
|
||
}
|
||
|
||
WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
|
||
numstabs++;
|
||
|
||
/* relocation table entry */
|
||
|
||
WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
|
||
WRITELONG(rptr, R_X86_64_32);
|
||
WRITELONG(rptr, ptr->info.section + 2);
|
||
|
||
ptr = ptr->next;
|
||
|
||
}
|
||
|
||
((struct stabentry *)sbuf)->n_desc = numstabs;
|
||
|
||
nasm_free(allfiles);
|
||
nasm_free(fileidx);
|
||
|
||
stablen = (sptr - sbuf);
|
||
stabrellen = (rptr - rbuf);
|
||
stabrelbuf = rbuf;
|
||
stabbuf = sbuf;
|
||
stabstrbuf = ssbuf;
|
||
}
|
||
|
||
void stabs64_cleanup(void)
|
||
{
|
||
struct linelist *ptr, *del;
|
||
if (!stabslines)
|
||
return;
|
||
ptr = stabslines;
|
||
while (ptr) {
|
||
del = ptr;
|
||
ptr = ptr->next;
|
||
nasm_free(del);
|
||
}
|
||
if (stabbuf)
|
||
nasm_free(stabbuf);
|
||
if (stabrelbuf)
|
||
nasm_free(stabrelbuf);
|
||
if (stabstrbuf)
|
||
nasm_free(stabstrbuf);
|
||
}
|
||
/* dwarf routines */
|
||
|
||
|
||
void dwarf64_linenum(const char *filename, int32_t linenumber, int32_t segto)
|
||
{
|
||
(void)segto;
|
||
dwarf64_findfile(filename);
|
||
debug_immcall = 1;
|
||
currentline = linenumber;
|
||
}
|
||
|
||
/* called from elf_out with type == TY_DEBUGSYMLIN */
|
||
void dwarf64_output(int type, void *param)
|
||
{
|
||
int ln, aa, inx, maxln, soc;
|
||
struct symlininfo *s;
|
||
struct SAA *plinep;
|
||
|
||
(void)type;
|
||
|
||
s = (struct symlininfo *)param;
|
||
/* line number info is only gathered for executable sections */
|
||
if (!(sects[s->section]->flags & SHF_EXECINSTR))
|
||
return;
|
||
/* Check if section index has changed */
|
||
if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
|
||
{
|
||
dwarf64_findsect(s->section);
|
||
}
|
||
/* do nothing unless line or file has changed */
|
||
if (debug_immcall)
|
||
{
|
||
ln = currentline - dwarf_csect->line;
|
||
aa = s->offset - dwarf_csect->offset;
|
||
inx = dwarf_clist->line;
|
||
plinep = dwarf_csect->psaa;
|
||
/* check for file change */
|
||
if (!(inx == dwarf_csect->file))
|
||
{
|
||
saa_write8(plinep,DW_LNS_set_file);
|
||
saa_write8(plinep,inx);
|
||
dwarf_csect->file = inx;
|
||
}
|
||
/* check for line change */
|
||
if (ln)
|
||
{
|
||
/* test if in range of special op code */
|
||
maxln = line_base + line_range;
|
||
soc = (ln - line_base) + (line_range * aa) + opcode_base;
|
||
if (ln >= line_base && ln < maxln && soc < 256)
|
||
{
|
||
saa_write8(plinep,soc);
|
||
}
|
||
else
|
||
{
|
||
if (ln)
|
||
{
|
||
saa_write8(plinep,DW_LNS_advance_line);
|
||
saa_wleb128s(plinep,ln);
|
||
}
|
||
if (aa)
|
||
{
|
||
saa_write8(plinep,DW_LNS_advance_pc);
|
||
saa_wleb128u(plinep,aa);
|
||
}
|
||
}
|
||
dwarf_csect->line = currentline;
|
||
dwarf_csect->offset = s->offset;
|
||
}
|
||
/* show change handled */
|
||
debug_immcall = 0;
|
||
}
|
||
}
|
||
|
||
|
||
void dwarf64_generate(void)
|
||
{
|
||
uint8_t *pbuf;
|
||
int indx;
|
||
struct linelist *ftentry;
|
||
struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
|
||
struct SAA *parangesrel, *plinesrel, *pinforel;
|
||
struct sectlist *psect;
|
||
size_t saalen, linepoff, totlen, highaddr;
|
||
|
||
/* write epilogues for each line program range */
|
||
/* and build aranges section */
|
||
paranges = saa_init(1L);
|
||
parangesrel = saa_init(1L);
|
||
saa_write16(paranges,3); /* dwarf version */
|
||
saa_write64(parangesrel, paranges->datalen+4);
|
||
saa_write64(parangesrel, (dwarf_infosym << 32) + R_X86_64_32); /* reloc to info */
|
||
saa_write64(parangesrel, 0);
|
||
saa_write32(paranges,0); /* offset into info */
|
||
saa_write8(paranges,8); /* pointer size */
|
||
saa_write8(paranges,0); /* not segmented */
|
||
saa_write32(paranges,0); /* padding */
|
||
/* iterate though sectlist entries */
|
||
psect = dwarf_fsect;
|
||
totlen = 0;
|
||
highaddr = 0;
|
||
for (indx = 0; indx < dwarf_nsections; indx++)
|
||
{
|
||
plinep = psect->psaa;
|
||
/* Line Number Program Epilogue */
|
||
saa_write8(plinep,2); /* std op 2 */
|
||
saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
|
||
saa_write8(plinep,DW_LNS_extended_op);
|
||
saa_write8(plinep,1); /* operand length */
|
||
saa_write8(plinep,DW_LNE_end_sequence);
|
||
totlen += plinep->datalen;
|
||
/* range table relocation entry */
|
||
saa_write64(parangesrel, paranges->datalen + 4);
|
||
saa_write64(parangesrel, ((uint64_t) (psect->section + 2) << 32) + R_X86_64_64);
|
||
saa_write64(parangesrel, (uint64_t) 0);
|
||
/* range table entry */
|
||
saa_write64(paranges,0x0000); /* range start */
|
||
saa_write64(paranges,sects[psect->section]->len); /* range length */
|
||
highaddr += sects[psect->section]->len;
|
||
/* done with this entry */
|
||
psect = psect->next;
|
||
}
|
||
saa_write64(paranges,0); /* null address */
|
||
saa_write64(paranges,0); /* null length */
|
||
saalen = paranges->datalen;
|
||
arangeslen = saalen + 4;
|
||
arangesbuf = pbuf = nasm_malloc(arangeslen);
|
||
WRITELONG(pbuf,saalen); /* initial length */
|
||
saa_rnbytes(paranges, pbuf, saalen);
|
||
saa_free(paranges);
|
||
|
||
/* build rela.aranges section */
|
||
arangesrellen = saalen = parangesrel->datalen;
|
||
arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
|
||
saa_rnbytes(parangesrel, pbuf, saalen);
|
||
saa_free(parangesrel);
|
||
|
||
/* build pubnames section */
|
||
ppubnames = saa_init(1L);
|
||
saa_write16(ppubnames,3); /* dwarf version */
|
||
saa_write32(ppubnames,0); /* offset into info */
|
||
saa_write32(ppubnames,0); /* space used in info */
|
||
saa_write32(ppubnames,0); /* end of list */
|
||
saalen = ppubnames->datalen;
|
||
pubnameslen = saalen + 4;
|
||
pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
|
||
WRITELONG(pbuf,saalen); /* initial length */
|
||
saa_rnbytes(ppubnames, pbuf, saalen);
|
||
saa_free(ppubnames);
|
||
|
||
/* build info section */
|
||
pinfo = saa_init(1L);
|
||
pinforel = saa_init(1L);
|
||
saa_write16(pinfo,3); /* dwarf version */
|
||
saa_write64(pinforel, pinfo->datalen + 4);
|
||
saa_write64(pinforel, (dwarf_abbrevsym << 32) + R_X86_64_32); /* reloc to abbrev */
|
||
saa_write64(pinforel, 0);
|
||
saa_write32(pinfo,0); /* offset into abbrev */
|
||
saa_write8(pinfo,8); /* pointer size */
|
||
saa_write8(pinfo,1); /* abbrviation number LEB128u */
|
||
saa_write64(pinforel, pinfo->datalen + 4);
|
||
saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
|
||
saa_write64(pinforel, 0);
|
||
saa_write64(pinfo,0); /* DW_AT_low_pc */
|
||
saa_write64(pinforel, pinfo->datalen + 4);
|
||
saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
|
||
saa_write64(pinforel, 0);
|
||
saa_write64(pinfo,highaddr); /* DW_AT_high_pc */
|
||
saa_write64(pinforel, pinfo->datalen + 4);
|
||
saa_write64(pinforel, (dwarf_linesym << 32) + R_X86_64_32); /* reloc to line */
|
||
saa_write64(pinforel, 0);
|
||
saa_write32(pinfo,0); /* DW_AT_stmt_list */
|
||
saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
|
||
saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
|
||
saa_write16(pinfo,DW_LANG_Mips_Assembler);
|
||
saa_write8(pinfo,2); /* abbrviation number LEB128u */
|
||
saa_write64(pinforel, pinfo->datalen + 4);
|
||
saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
|
||
saa_write64(pinforel, 0);
|
||
saa_write64(pinfo,0); /* DW_AT_low_pc */
|
||
saa_write64(pinfo,0); /* DW_AT_frame_base */
|
||
saa_write8(pinfo,0); /* end of entries */
|
||
saalen = pinfo->datalen;
|
||
infolen = saalen + 4;
|
||
infobuf = pbuf = nasm_malloc(infolen);
|
||
WRITELONG(pbuf,saalen); /* initial length */
|
||
saa_rnbytes(pinfo, pbuf, saalen);
|
||
saa_free(pinfo);
|
||
|
||
/* build rela.info section */
|
||
inforellen = saalen = pinforel->datalen;
|
||
inforelbuf = pbuf = nasm_malloc(inforellen);
|
||
saa_rnbytes(pinforel, pbuf, saalen);
|
||
saa_free(pinforel);
|
||
|
||
/* build abbrev section */
|
||
pabbrev = saa_init(1L);
|
||
saa_write8(pabbrev,1); /* entry number LEB128u */
|
||
saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
|
||
saa_write8(pabbrev,1); /* has children */
|
||
/* the following attributes and forms are all LEB128u values */
|
||
saa_write8(pabbrev,DW_AT_low_pc);
|
||
saa_write8(pabbrev,DW_FORM_addr);
|
||
saa_write8(pabbrev,DW_AT_high_pc);
|
||
saa_write8(pabbrev,DW_FORM_addr);
|
||
saa_write8(pabbrev,DW_AT_stmt_list);
|
||
saa_write8(pabbrev,DW_FORM_data4);
|
||
saa_write8(pabbrev,DW_AT_name);
|
||
saa_write8(pabbrev,DW_FORM_string);
|
||
saa_write8(pabbrev,DW_AT_producer);
|
||
saa_write8(pabbrev,DW_FORM_string);
|
||
saa_write8(pabbrev,DW_AT_language);
|
||
saa_write8(pabbrev,DW_FORM_data2);
|
||
saa_write16(pabbrev,0); /* end of entry */
|
||
/* LEB128u usage same as above */
|
||
saa_write8(pabbrev,2); /* entry number */
|
||
saa_write8(pabbrev,DW_TAG_subprogram);
|
||
saa_write8(pabbrev,0); /* no children */
|
||
saa_write8(pabbrev,DW_AT_low_pc);
|
||
saa_write8(pabbrev,DW_FORM_addr);
|
||
saa_write8(pabbrev,DW_AT_frame_base);
|
||
saa_write8(pabbrev,DW_FORM_data4);
|
||
saa_write16(pabbrev,0); /* end of entry */
|
||
abbrevlen = saalen = pabbrev->datalen;
|
||
abbrevbuf = pbuf = nasm_malloc(saalen);
|
||
saa_rnbytes(pabbrev, pbuf, saalen);
|
||
saa_free(pabbrev);
|
||
|
||
/* build line section */
|
||
/* prolog */
|
||
plines = saa_init(1L);
|
||
saa_write8(plines,1); /* Minimum Instruction Length */
|
||
saa_write8(plines,1); /* Initial value of 'is_stmt' */
|
||
saa_write8(plines,line_base); /* Line Base */
|
||
saa_write8(plines,line_range); /* Line Range */
|
||
saa_write8(plines,opcode_base); /* Opcode Base */
|
||
/* standard opcode lengths (# of LEB128u operands) */
|
||
saa_write8(plines,0); /* Std opcode 1 length */
|
||
saa_write8(plines,1); /* Std opcode 2 length */
|
||
saa_write8(plines,1); /* Std opcode 3 length */
|
||
saa_write8(plines,1); /* Std opcode 4 length */
|
||
saa_write8(plines,1); /* Std opcode 5 length */
|
||
saa_write8(plines,0); /* Std opcode 6 length */
|
||
saa_write8(plines,0); /* Std opcode 7 length */
|
||
saa_write8(plines,0); /* Std opcode 8 length */
|
||
saa_write8(plines,1); /* Std opcode 9 length */
|
||
saa_write8(plines,0); /* Std opcode 10 length */
|
||
saa_write8(plines,0); /* Std opcode 11 length */
|
||
saa_write8(plines,1); /* Std opcode 12 length */
|
||
/* Directory Table */
|
||
saa_write8(plines,0); /* End of table */
|
||
/* File Name Table */
|
||
ftentry = dwarf_flist;
|
||
for (indx = 0;indx<dwarf_numfiles;indx++)
|
||
{
|
||
saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
|
||
saa_write8(plines,0); /* directory LEB128u */
|
||
saa_write8(plines,0); /* time LEB128u */
|
||
saa_write8(plines,0); /* size LEB128u */
|
||
ftentry = ftentry->next;
|
||
}
|
||
saa_write8(plines,0); /* End of table */
|
||
linepoff = plines->datalen;
|
||
linelen = linepoff + totlen + 10;
|
||
linebuf = pbuf = nasm_malloc(linelen);
|
||
WRITELONG(pbuf,linelen-4); /* initial length */
|
||
WRITESHORT(pbuf,3); /* dwarf version */
|
||
WRITELONG(pbuf,linepoff); /* offset to line number program */
|
||
/* write line header */
|
||
saalen = linepoff;
|
||
saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
|
||
pbuf += linepoff;
|
||
saa_free(plines);
|
||
/* concatonate line program ranges */
|
||
linepoff += 13;
|
||
plinesrel = saa_init(1L);
|
||
psect = dwarf_fsect;
|
||
for (indx = 0; indx < dwarf_nsections; indx++)
|
||
{
|
||
saa_write64(plinesrel, linepoff);
|
||
saa_write64(plinesrel, ((uint64_t) (psect->section + 2) << 32) + R_X86_64_64);
|
||
saa_write64(plinesrel, (uint64_t) 0);
|
||
plinep = psect->psaa;
|
||
saalen = plinep->datalen;
|
||
saa_rnbytes(plinep, pbuf, saalen);
|
||
pbuf += saalen;
|
||
linepoff += saalen;
|
||
saa_free(plinep);
|
||
/* done with this entry */
|
||
psect = psect->next;
|
||
}
|
||
|
||
|
||
/* build rela.lines section */
|
||
linerellen =saalen = plinesrel->datalen;
|
||
linerelbuf = pbuf = nasm_malloc(linerellen);
|
||
saa_rnbytes(plinesrel, pbuf, saalen);
|
||
saa_free(plinesrel);
|
||
|
||
/* build frame section */
|
||
framelen = 4;
|
||
framebuf = pbuf = nasm_malloc(framelen);
|
||
WRITELONG(pbuf,framelen-4); /* initial length */
|
||
|
||
/* build loc section */
|
||
loclen = 16;
|
||
locbuf = pbuf = nasm_malloc(loclen);
|
||
WRITEDLONG(pbuf,0); /* null beginning offset */
|
||
WRITEDLONG(pbuf,0); /* null ending offset */
|
||
}
|
||
|
||
void dwarf64_cleanup(void)
|
||
{
|
||
if (arangesbuf)
|
||
nasm_free(arangesbuf);
|
||
if (arangesrelbuf)
|
||
nasm_free(arangesrelbuf);
|
||
if (pubnamesbuf)
|
||
nasm_free(pubnamesbuf);
|
||
if (infobuf)
|
||
nasm_free(infobuf);
|
||
if (inforelbuf)
|
||
nasm_free(inforelbuf);
|
||
if (abbrevbuf)
|
||
nasm_free(abbrevbuf);
|
||
if (linebuf)
|
||
nasm_free(linebuf);
|
||
if (linerelbuf)
|
||
nasm_free(linerelbuf);
|
||
if (framebuf)
|
||
nasm_free(framebuf);
|
||
if (locbuf)
|
||
nasm_free(locbuf);
|
||
}
|
||
void dwarf64_findfile(const char * fname)
|
||
{
|
||
int finx;
|
||
struct linelist *match;
|
||
|
||
/* return if fname is current file name */
|
||
if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename))) return;
|
||
/* search for match */
|
||
else
|
||
{
|
||
match = 0;
|
||
if (dwarf_flist)
|
||
{
|
||
match = dwarf_flist;
|
||
for (finx = 0; finx < dwarf_numfiles; finx++)
|
||
{
|
||
if (!(strcmp(fname, match->filename)))
|
||
{
|
||
dwarf_clist = match;
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
/* add file name to end of list */
|
||
dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
|
||
dwarf_numfiles++;
|
||
dwarf_clist->line = dwarf_numfiles;
|
||
dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
|
||
strcpy(dwarf_clist->filename,fname);
|
||
dwarf_clist->next = 0;
|
||
/* if first entry */
|
||
if (!dwarf_flist)
|
||
{
|
||
dwarf_flist = dwarf_elist = dwarf_clist;
|
||
dwarf_clist->last = 0;
|
||
}
|
||
/* chain to previous entry */
|
||
else
|
||
{
|
||
dwarf_elist->next = dwarf_clist;
|
||
dwarf_elist = dwarf_clist;
|
||
}
|
||
}
|
||
}
|
||
/* */
|
||
void dwarf64_findsect(const int index)
|
||
{
|
||
int sinx;
|
||
struct sectlist *match;
|
||
struct SAA *plinep;
|
||
/* return if index is current section index */
|
||
if (dwarf_csect && (dwarf_csect->section == index))
|
||
{
|
||
return;
|
||
}
|
||
/* search for match */
|
||
else
|
||
{
|
||
match = 0;
|
||
if (dwarf_fsect)
|
||
{
|
||
match = dwarf_fsect;
|
||
for (sinx = 0; sinx < dwarf_nsections; sinx++)
|
||
{
|
||
if ((match->section == index))
|
||
{
|
||
dwarf_csect = match;
|
||
return;
|
||
}
|
||
match = match->next;
|
||
}
|
||
}
|
||
/* add entry to end of list */
|
||
dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
|
||
dwarf_nsections++;
|
||
dwarf_csect->psaa = plinep = saa_init(1L);
|
||
dwarf_csect->line = 1;
|
||
dwarf_csect->offset = 0;
|
||
dwarf_csect->file = 1;
|
||
dwarf_csect->section = index;
|
||
dwarf_csect->next = 0;
|
||
/* set relocatable address at start of line program */
|
||
saa_write8(plinep,DW_LNS_extended_op);
|
||
saa_write8(plinep,9); /* operand length */
|
||
saa_write8(plinep,DW_LNE_set_address);
|
||
saa_write64(plinep,0); /* Start Address */
|
||
/* if first entry */
|
||
if (!dwarf_fsect)
|
||
{
|
||
dwarf_fsect = dwarf_esect = dwarf_csect;
|
||
dwarf_csect->last = 0;
|
||
}
|
||
/* chain to previous entry */
|
||
else
|
||
{
|
||
dwarf_esect->next = dwarf_csect;
|
||
dwarf_esect = dwarf_csect;
|
||
}
|
||
}
|
||
}
|
||
|
||
#endif /* OF_ELF */
|