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nasm/output/outelf.c
H. Peter Anvin 14b16442ce outelf: change debug format default to dwarf 
DWARF is by far the predominant format on ELF platforms these
days. Catch up with the times.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2019-08-10 02:30:29 -07:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2019 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* Common code for outelf32 and outelf64
*/
#include "compiler.h"
#include "nasm.h"
#include "nasmlib.h"
#include "error.h"
#include "saa.h"
#include "raa.h"
#include "stdscan.h"
#include "eval.h"
#include "outform.h"
#include "outlib.h"
#include "rbtree.h"
#include "hashtbl.h"
#include "ver.h"
#include "dwarf.h"
#include "stabs.h"
#include "outelf.h"
#include "elf.h"
#if defined(OF_ELF32) || defined(OF_ELF64) || defined(OF_ELFX32)
#define SECT_DELTA 32
static struct elf_section **sects;
static int nsects, sectlen;
#define SHSTR_DELTA 256
static char *shstrtab;
static int shstrtablen, shstrtabsize;
static struct SAA *syms;
static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */
static int32_t def_seg;
static struct RAA *bsym;
static struct SAA *symtab, *symtab_shndx;
static struct SAA *strs;
static uint32_t strslen;
static struct RAA *section_by_index;
static struct hash_table section_by_name;
static struct elf_symbol *fwds;
static char elf_module[FILENAME_MAX];
extern const struct ofmt of_elf32;
extern const struct ofmt of_elf64;
extern const struct ofmt of_elfx32;
static struct ELF_SECTDATA {
void *data;
int64_t len;
bool is_saa;
} *elf_sects;
static int elf_nsect, nsections;
static int64_t elf_foffs;
static void elf_write(void);
static void elf_sect_write(struct elf_section *, const void *, size_t);
static void elf_sect_writeaddr(struct elf_section *, int64_t, size_t);
static void elf_section_header(int name, int type, uint64_t flags,
void *data, bool is_saa, uint64_t datalen,
int link, int info,
uint64_t align, uint64_t entsize);
static void elf_write_sections(void);
static size_t elf_build_symtab(void);
static int add_sectname(const char *, const char *);
/* First debugging section index */
static int sec_debug;
struct erel {
int offset;
int info;
};
struct symlininfo {
int offset;
int section; /* index into sects[] */
int segto; /* internal section number */
char *name; /* shallow-copied pointer of section name */
};
struct linelist {
struct linelist *next;
struct linelist *last;
struct symlininfo info;
char *filename;
int line;
};
struct sectlist {
struct SAA *psaa;
int section;
int line;
int offset;
int file;
struct sectlist *next;
struct sectlist *last;
};
/* common debug variables */
static int currentline = 1;
static int debug_immcall = 0;
/* stabs debug variables */
static struct linelist *stabslines = 0;
static int numlinestabs = 0;
static char *stabs_filename = 0;
static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
static int stablen, stabstrlen, stabrellen;
/* dwarf debug variables */
static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
static int dwarf_numfiles = 0, dwarf_nsections;
static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
*abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
static int8_t line_base = -5, line_range = 14, opcode_base = 13;
static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
abbrevlen, linelen, linerellen, framelen, loclen;
static int64_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
static struct elf_symbol *lastsym;
/* common debugging routines */
static void debug_typevalue(int32_t);
/* stabs debugging routines */
static void stabs_linenum(const char *filename, int32_t linenumber, int32_t);
static void stabs_output(int, void *);
static void stabs_generate(void);
static void stabs_cleanup(void);
/* dwarf debugging routines */
static void dwarf_init(void);
static void dwarf_linenum(const char *filename, int32_t linenumber, int32_t);
static void dwarf_output(int, void *);
static void dwarf_generate(void);
static void dwarf_cleanup(void);
static void dwarf_findfile(const char *);
static void dwarf_findsect(const int);
struct elf_format_info {
size_t word; /* Word size (4 or 8) */
size_t ehdr_size; /* Size of the ELF header */
size_t shdr_size; /* Size of a section header */
size_t sym_size; /* Size of a symbol */
size_t rel_size; /* Size of a reltype relocation */
size_t rela_size; /* Size of a RELA relocation */
char relpfx[8]; /* Relocation section prefix */
uint32_t reltype; /* Relocation section type */
uint16_t e_machine; /* Header e_machine field */
uint8_t ei_class; /* ELFCLASS32 or ELFCLASS64 */
bool elf64; /* 64-bit ELF */
/* Write a symbol */
void (*elf_sym)(const struct elf_symbol *);
/* Build a relocation table */
struct SAA *(*elf_build_reltab)(const struct elf_reloc *);
};
static const struct elf_format_info *efmt;
static void elf32_sym(const struct elf_symbol *sym);
static void elf64_sym(const struct elf_symbol *sym);
static struct SAA *elf32_build_reltab(const struct elf_reloc *r);
static struct SAA *elfx32_build_reltab(const struct elf_reloc *r);
static struct SAA *elf64_build_reltab(const struct elf_reloc *r);
static bool dfmt_is_stabs(void);
static bool dfmt_is_dwarf(void);
/*
* Special NASM section numbers which are used to define ELF special
* symbols.
*/
static int32_t elf_gotpc_sect, elf_gotoff_sect;
static int32_t elf_got_sect, elf_plt_sect;
static int32_t elf_sym_sect, elf_gottpoff_sect, elf_tlsie_sect;
uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
uint8_t elf_abiver = 0; /* Current ABI version */
/* Known sections with nonstandard defaults. -n means n*pointer size. */
struct elf_known_section {
const char *name; /* Name of section */
int type; /* Section type (SHT_) */
uint32_t flags; /* Section flags (SHF_) */
int align; /* Section alignment */
int entsize; /* Entry size, if applicable */
};
static const struct elf_known_section elf_known_sections[] = {
{ ".text", SHT_PROGBITS, SHF_ALLOC|SHF_EXECINSTR, 16, 0 },
{ ".rodata", SHT_PROGBITS, SHF_ALLOC, 4, 0 },
{ ".lrodata", SHT_PROGBITS, SHF_ALLOC, 4, 0 },
{ ".data", SHT_PROGBITS, SHF_ALLOC|SHF_WRITE, 4, 0 },
{ ".ldata", SHT_PROGBITS, SHF_ALLOC|SHF_WRITE, 4, 0 },
{ ".bss", SHT_NOBITS, SHF_ALLOC|SHF_WRITE, 4, 0 },
{ ".lbss", SHT_NOBITS, SHF_ALLOC|SHF_WRITE, 4, 0 },
{ ".tdata", SHT_PROGBITS, SHF_ALLOC|SHF_WRITE|SHF_TLS, 4, 0 },
{ ".tbss", SHT_NOBITS, SHF_ALLOC|SHF_WRITE|SHF_TLS, 4, 0 },
{ ".comment", SHT_PROGBITS, 0, 1, 0 },
{ ".preinit_array", SHT_PREINIT_ARRAY, SHF_ALLOC, -1, -1 },
{ ".init_array", SHT_INIT_ARRAY, SHF_ALLOC, -1, -1 },
{ ".fini_array", SHT_FINI_ARRAY, SHF_ALLOC, -1, -1 },
{ ".note", SHT_NOTE, 0, 4, 0 },
{ NULL /*default*/, SHT_PROGBITS, SHF_ALLOC, 1, 0 }
};
struct size_unit {
char name[8];
int bytes;
int align;
};
static const struct size_unit size_units[] =
{
{ "byte", 1, 1 },
{ "word", 2, 2 },
{ "dword", 4, 4 },
{ "qword", 8, 8 },
{ "tword", 10, 2 },
{ "tbyte", 10, 2 },
{ "oword", 16, 16 },
{ "xword", 16, 16 },
{ "yword", 32, 32 },
{ "zword", 64, 64 },
{ "pointer", -1, -1 },
{ "", 0, 0 }
};
static inline size_t to_bytes(int val)
{
return (val >= 0) ? (size_t)val : -val * efmt->word;
}
/* parse section attributes */
static void elf_section_attrib(char *name, char *attr, uint32_t *flags_and, uint32_t *flags_or,
uint64_t *alignp, uint64_t *entsize, int *type)
{
char *opt, *val, *next;
uint64_t align = 0;
uint64_t xalign = 0;
opt = nasm_skip_spaces(attr);
if (!opt || !*opt)
return;
while ((opt = nasm_opt_val(opt, &val, &next))) {
if (!nasm_stricmp(opt, "align")) {
if (!val) {
nasm_nonfatal("section align without value specified");
} else {
bool err;
uint64_t a = readnum(val, &err);
if (a && !is_power2(a)) {
nasm_error(ERR_NONFATAL,
"section alignment %"PRId64" is not a power of two",
a);
} else if (a > align) {
align = a;
}
}
} else if (!nasm_stricmp(opt, "alloc")) {
*flags_and |= SHF_ALLOC;
*flags_or |= SHF_ALLOC;
} else if (!nasm_stricmp(opt, "noalloc")) {
*flags_and |= SHF_ALLOC;
*flags_or &= ~SHF_ALLOC;
} else if (!nasm_stricmp(opt, "exec")) {
*flags_and |= SHF_EXECINSTR;
*flags_or |= SHF_EXECINSTR;
} else if (!nasm_stricmp(opt, "noexec")) {
*flags_and |= SHF_EXECINSTR;
*flags_or &= ~SHF_EXECINSTR;
} else if (!nasm_stricmp(opt, "write")) {
*flags_and |= SHF_WRITE;
*flags_or |= SHF_WRITE;
} else if (!nasm_stricmp(opt, "nowrite") ||
!nasm_stricmp(opt, "readonly")) {
*flags_and |= SHF_WRITE;
*flags_or &= ~SHF_WRITE;
} else if (!nasm_stricmp(opt, "tls")) {
*flags_and |= SHF_TLS;
*flags_or |= SHF_TLS;
} else if (!nasm_stricmp(opt, "notls")) {
*flags_and |= SHF_TLS;
*flags_or &= ~SHF_TLS;
} else if (!nasm_stricmp(opt, "merge")) {
*flags_and |= SHF_MERGE;
*flags_or |= SHF_MERGE;
} else if (!nasm_stricmp(opt, "nomerge")) {
*flags_and |= SHF_MERGE;
*flags_or &= ~SHF_MERGE;
} else if (!nasm_stricmp(opt, "strings")) {
*flags_and |= SHF_STRINGS;
*flags_or |= SHF_STRINGS;
} else if (!nasm_stricmp(opt, "nostrings")) {
*flags_and |= SHF_STRINGS;
*flags_or &= ~SHF_STRINGS;
} else if (!nasm_stricmp(opt, "progbits")) {
*type = SHT_PROGBITS;
} else if (!nasm_stricmp(opt, "nobits")) {
*type = SHT_NOBITS;
} else if (!nasm_stricmp(opt, "note")) {
*type = SHT_NOTE;
} else if (!nasm_stricmp(opt, "preinit_array")) {
*type = SHT_PREINIT_ARRAY;
} else if (!nasm_stricmp(opt, "init_array")) {
*type = SHT_INIT_ARRAY;
} else if (!nasm_stricmp(opt, "fini_array")) {
*type = SHT_FINI_ARRAY;
} else {
uint64_t mult;
size_t l;
const char *a = strchr(opt, '*');
bool err;
const struct size_unit *su;
if (a) {
l = a - opt - 1;
mult = readnum(a+1, &err);
} else {
l = strlen(opt);
mult = 1;
}
for (su = size_units; su->bytes; su++) {
if (!nasm_strnicmp(opt, su->name, l))
break;
}
if (su->bytes) {
*entsize = to_bytes(su->bytes) * mult;
xalign = to_bytes(su->align);
} else {
/* Unknown attribute */
nasm_warn(WARN_OTHER,
"unknown section attribute '%s' ignored on"
" declaration of section `%s'", opt, name);
}
}
opt = next;
}
switch (*type) {
case SHT_PREINIT_ARRAY:
case SHT_INIT_ARRAY:
case SHT_FINI_ARRAY:
if (!xalign)
xalign = efmt->word;
if (!*entsize)
*entsize = efmt->word;
break;
default:
break;
}
if (!align)
align = xalign;
if (!align)
align = SHA_ANY;
*alignp = align;
}
static enum directive_result
elf_directive(enum directive directive, char *value)
{
int64_t n;
bool err;
char *p;
switch (directive) {
case D_OSABI:
if (!pass_first()) /* XXX: Why? */
return DIRR_OK;
n = readnum(value, &err);
if (err) {
nasm_nonfatal("`osabi' directive requires a parameter");
return DIRR_ERROR;
}
if (n < 0 || n > 255) {
nasm_nonfatal("valid osabi numbers are 0 to 255");
return DIRR_ERROR;
}
elf_osabi = n;
elf_abiver = 0;
p = strchr(value,',');
if (!p)
return DIRR_OK;
n = readnum(p + 1, &err);
if (err || n < 0 || n > 255) {
nasm_nonfatal("invalid ABI version number (valid: 0 to 255)");
return DIRR_ERROR;
}
elf_abiver = n;
return DIRR_OK;
default:
return DIRR_UNKNOWN;
}
}
static void elf_init(void);
static void elf32_init(void)
{
static const struct elf_format_info ef_elf32 = {
4,
sizeof(Elf32_Ehdr),
sizeof(Elf32_Shdr),
sizeof(Elf32_Sym),
sizeof(Elf32_Rel),
sizeof(Elf32_Rela),
".rel",
SHT_REL,
EM_386,
ELFCLASS32,
false,
elf32_sym,
elf32_build_reltab
};
efmt = &ef_elf32;
elf_init();
}
static void elfx32_init(void)
{
static const struct elf_format_info ef_elfx32 = {
4,
sizeof(Elf32_Ehdr),
sizeof(Elf32_Shdr),
sizeof(Elf32_Sym),
sizeof(Elf32_Rela),
sizeof(Elf32_Rela),
".rela",
SHT_RELA,
EM_X86_64,
ELFCLASS32,
false,
elf32_sym,
elfx32_build_reltab
};
efmt = &ef_elfx32;
elf_init();
}
static void elf64_init(void)
{
static const struct elf_format_info ef_elf64 = {
8,
sizeof(Elf64_Ehdr),
sizeof(Elf64_Shdr),
sizeof(Elf64_Sym),
sizeof(Elf64_Rela),
sizeof(Elf64_Rela),
".rela",
SHT_RELA,
EM_X86_64,
ELFCLASS64,
true,
elf64_sym,
elf64_build_reltab
};
efmt = &ef_elf64;
elf_init();
}
static void elf_init(void)
{
static const char * const reserved_sections[] = {
".shstrtab", ".strtab", ".symtab", ".symtab_shndx", NULL
};
const char * const *p;
strlcpy(elf_module, inname, sizeof(elf_module));
sects = NULL;
nsects = sectlen = 0;
syms = saa_init((int32_t)sizeof(struct elf_symbol));
nlocals = nglobs = ndebugs = 0;
bsym = raa_init();
strs = saa_init(1L);
saa_wbytes(strs, "\0", 1L);
saa_wbytes(strs, elf_module, strlen(elf_module)+1);
strslen = 2 + strlen(elf_module);
shstrtab = NULL;
shstrtablen = shstrtabsize = 0;;
add_sectname("", ""); /* SHN_UNDEF */
fwds = NULL;
section_by_index = raa_init();
/*
* Add reserved section names to the section hash, with NULL
* as the data pointer
*/
for (p = reserved_sections; *p; p++) {
struct hash_insert hi;
hash_find(&section_by_name, *p, &hi);
hash_add(&hi, *p, NULL);
}
/*
* FIXME: tlsie is Elf32 only and
* gottpoff is Elfx32|64 only.
*/
elf_gotpc_sect = seg_alloc();
backend_label("..gotpc", elf_gotpc_sect + 1, 0L);
elf_gotoff_sect = seg_alloc();
backend_label("..gotoff", elf_gotoff_sect + 1, 0L);
elf_got_sect = seg_alloc();
backend_label("..got", elf_got_sect + 1, 0L);
elf_plt_sect = seg_alloc();
backend_label("..plt", elf_plt_sect + 1, 0L);
elf_sym_sect = seg_alloc();
backend_label("..sym", elf_sym_sect + 1, 0L);
elf_gottpoff_sect = seg_alloc();
backend_label("..gottpoff", elf_gottpoff_sect + 1, 0L);
elf_tlsie_sect = seg_alloc();
backend_label("..tlsie", elf_tlsie_sect + 1, 0L);
def_seg = seg_alloc();
}
static void elf_cleanup(void)
{
struct elf_reloc *r;
int i;
elf_write();
for (i = 0; i < nsects; i++) {
if (sects[i]->type != SHT_NOBITS)
saa_free(sects[i]->data);
if (sects[i]->rel)
saa_free(sects[i]->rel);
while (sects[i]->head) {
r = sects[i]->head;
sects[i]->head = sects[i]->head->next;
nasm_free(r);
}
}
hash_free(&section_by_name);
raa_free(section_by_index);
nasm_free(sects);
saa_free(syms);
raa_free(bsym);
saa_free(strs);
dfmt->cleanup();
}
/*
* Add entry to the elf .shstrtab section and increment nsections.
* Returns the section index for this new section.
*
* IMPORTANT: this needs to match the order the section headers are
* emitted.
*/
static int add_sectname(const char *firsthalf, const char *secondhalf)
{
int l1 = strlen(firsthalf);
int l2 = strlen(secondhalf);
while (shstrtablen + l1 + l2 + 1 > shstrtabsize)
shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
memcpy(shstrtab + shstrtablen, firsthalf, l1);
shstrtablen += l1;
memcpy(shstrtab + shstrtablen, secondhalf, l2+1);
shstrtablen += l2 + 1;
return nsections++;
}
static struct elf_section *
elf_make_section(char *name, int type, int flags, uint64_t align)
{
struct elf_section *s;
s = nasm_zalloc(sizeof(*s));
if (type != SHT_NOBITS)
s->data = saa_init(1L);
s->tail = &s->head;
if (!strcmp(name, ".text"))
s->index = def_seg;
else
s->index = seg_alloc();
s->name = nasm_strdup(name);
s->type = type;
s->flags = flags;
s->align = align;
s->shndx = add_sectname("", name);
if (nsects >= sectlen)
sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
sects[nsects++] = s;
return s;
}
static int32_t elf_section_names(char *name, int *bits)
{
char *p;
uint32_t flags, flags_and, flags_or;
uint64_t align, entsize;
void **hp;
struct elf_section *s;
struct hash_insert hi;
int type;
if (!name) {
*bits = ofmt->maxbits;
return def_seg;
}
p = nasm_skip_word(name);
if (*p)
*p++ = '\0';
flags_and = flags_or = type = align = entsize = 0;
elf_section_attrib(name, p, &flags_and, &flags_or, &align, &entsize, &type);
hp = hash_find(&section_by_name, name, &hi);
if (hp) {
s = *hp;
if (!s) {
nasm_nonfatal("attempt to redefine reserved section name `%s'", name);
return NO_SEG;
}
} else {
const struct elf_known_section *ks = elf_known_sections;
while (ks->name) {
if (!strcmp(name, ks->name))
break;
ks++;
}
type = type ? type : ks->type;
if (!align)
align = to_bytes(ks->align);
if (!entsize)
entsize = to_bytes(ks->entsize);
flags = (ks->flags & ~flags_and) | flags_or;
s = elf_make_section(name, type, flags, align);
hash_add(&hi, s->name, s);
section_by_index = raa_write_ptr(section_by_index, s->index >> 1, s);
}
if ((type && s->type != type)
|| ((s->flags & flags_and) != flags_or)
|| (entsize && s->entsize && entsize != s->entsize)) {
nasm_warn(WARN_OTHER, "incompatible section attributes ignored on"
" redeclaration of section `%s'", name);
}
if (align > s->align)
s->align = align;
if (entsize && !s->entsize)
s->entsize = entsize;
if ((flags_or & SHF_MERGE) && s->entsize == 0) {
if (!(s->flags & SHF_STRINGS))
nasm_nonfatal("section attribute merge specified without an entry size or `strings'");
s->entsize = 1;
}
return s->index;
}
static void elf_deflabel(char *name, int32_t segment, int64_t offset,
int is_global, char *special)
{
int pos = strslen;
struct elf_symbol *sym;
bool special_used = false;
if (debug_level(2)) {
nasm_debug(" elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
name, segment, offset, is_global, special);
}
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.
*
* FIXME: tlsie is Elf32 only, and gottpoff is Elfx32|64 only.
*/
if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
strcmp(name, "..got") && strcmp(name, "..plt") &&
strcmp(name, "..sym") && strcmp(name, "..gottpoff") &&
strcmp(name, "..tlsie"))
nasm_nonfatal("unrecognised special symbol `%s'", name);
return;
}
if (is_global == 3) {
struct elf_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 = nasm_skip_spaces(nasm_skip_word(special));
stdscan_reset();
stdscan_set(p);
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, NULL, 1, NULL);
if (e) {
if (!is_simple(e))
nasm_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 : SYM_LOCAL;
sym->other = STV_DEFAULT;
sym->size = 0;
if (segment == NO_SEG)
sym->section = XSHN_ABS;
else {
const struct elf_section *s;
sym->section = XSHN_UNDEF;
if (segment == def_seg) {
/* we have to be sure at least text section is there */
int tempint;
if (segment != elf_section_names(".text", &tempint))
nasm_panic("strange segment conditions in ELF driver");
}
s = raa_read_ptr(section_by_index, segment >> 1);
if (s)
sym->section = s->shndx;
}
if (is_global == 2) {
sym->size = offset;
sym->symv.key = 0;
sym->section = XSHN_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)
nasm_nonfatal("alignment constraint `%s' is not a"
" valid number", special);
else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1)
nasm_nonfatal("alignment constraint `%s' is not a"
" power of two", special);
}
special_used = true;
} else
sym->symv.key = (sym->section == XSHN_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 == XSHN_UNDEF || sym->section == XSHN_COMMON) {
bsym = raa_write(bsym, segment, nglobs);
} else if (sym->section != XSHN_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
nasm_nonfatal("unrecognised symbol type `%.*s'",
n, special);
special += n;
special = nasm_skip_spaces(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_get();
while (special[n] && nasm_isspace(special[n]))
n++;
/*
* We have a size expression; attempt to
* evaluate it.
*/
stdscan_reset();
stdscan_set(special + n);
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, &fwd, 0, NULL);
if (fwd) {
sym->nextfwd = fwds;
fwds = sym;
sym->name = nasm_strdup(name);
} else if (e) {
if (!is_simple(e))
nasm_nonfatal("cannot use relocatable"
" expression as symbol size");
else
sym->size = reloc_value(e);
}
stdscan_set(saveme);
}
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)
nasm_nonfatal("no special symbol features supported here");
}
static void elf_add_reloc(struct elf_section *sect, int32_t segment,
int64_t offset, int type)
{
struct elf_reloc *r;
r = *sect->tail = nasm_zalloc(sizeof(struct elf_reloc));
sect->tail = &r->next;
r->address = sect->len;
r->offset = offset;
if (segment != NO_SEG) {
const struct elf_section *s;
s = raa_read_ptr(section_by_index, segment >> 1);
if (s)
r->symbol = s->shndx + 1;
else
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 | R_X86_64_GOT32 references require the _exact_ symbol address to be
* used; R_386_32 | R_X86_64_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 int64_t elf_add_gsym_reloc(struct elf_section *sect,
int32_t segment, uint64_t offset,
int64_t pcrel, int type, bool exact)
{
struct elf_reloc *r;
struct elf_section *s;
struct elf_symbol *sym;
struct rbtree *srb;
/*
* 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 = raa_read_ptr(section_by_index, segment >> 1);
if (!s) {
if (exact && offset)
nasm_nonfatal("invalid access to an external symbol");
else
elf_add_reloc(sect, segment, offset - pcrel, type);
return 0;
}
srb = rb_search(s->gsyms, offset);
if (!srb || (exact && srb->key != offset)) {
nasm_nonfatal("unable to find a suitable global symbol"
" for this reference");
return 0;
}
sym = container_of(srb, struct elf_symbol, symv);
r = *sect->tail = nasm_malloc(sizeof(struct elf_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++;
return r->offset;
}
static void elf32_out(int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t wrt)
{
struct elf_section *s;
int64_t addr;
int reltype, bytes;
static struct symlininfo sinfo;
/*
* handle absolute-assembly (structure definitions)
*/
if (segto == NO_SEG) {
if (type != OUT_RESERVE)
nasm_nonfatal("attempt to assemble code in [ABSOLUTE] space");
return;
}
s = raa_read_ptr(section_by_index, segto >> 1);
if (!s) {
int tempint; /* ignored */
if (segto != elf_section_names(".text", &tempint))
nasm_panic("strange segment conditions in ELF driver");
else
s = sects[nsects - 1];
}
/* again some stabs debugging stuff */
sinfo.offset = s->len;
sinfo.section = s->shndx;
sinfo.segto = segto;
sinfo.name = s->name;
dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo);
/* end of debugging stuff */
if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
nasm_warn(WARN_OTHER, "attempt to initialize memory in"
" BSS section `%s': ignored", s->name);
s->len += realsize(type, size);
return;
}
switch (type) {
case OUT_RESERVE:
if (s->type != SHT_NOBITS) {
nasm_warn(WARN_ZEROING, "uninitialized space declared in"
" non-BSS section `%s': zeroing", s->name);
elf_sect_write(s, NULL, size);
} else
s->len += size;
break;
case OUT_RAWDATA:
elf_sect_write(s, data, size);
break;
case OUT_ADDRESS:
{
bool err = false;
int asize = abs((int)size);
addr = *(int64_t *)data;
if (segment != NO_SEG) {
if (segment & 1) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
/*
* The if() is a hack to deal with compilers which
* don't handle switch() statements with 64-bit
* expressions.
*/
switch (asize) {
case 1:
elf_add_reloc(s, segment, 0, R_386_8);
break;
case 2:
elf_add_reloc(s, segment, 0, R_386_16);
break;
case 4:
elf_add_reloc(s, segment, 0, R_386_32);
break;
default: /* Error issued further down */
err = true;
break;
}
} else if (wrt == elf_gotpc_sect + 1) {
/*
* The user will supply GOT relative to $$. ELF
* will let us have GOT relative to $. So we
* need to fix up the data item by $-$$.
*/
err = asize != 4;
addr += s->len;
elf_add_reloc(s, segment, 0, R_386_GOTPC);
} else if (wrt == elf_gotoff_sect + 1) {
err = asize != 4;
elf_add_reloc(s, segment, 0, R_386_GOTOFF);
} else if (wrt == elf_tlsie_sect + 1) {
err = asize != 4;
addr = elf_add_gsym_reloc(s, segment, addr, 0,
R_386_TLS_IE, true);
} else if (wrt == elf_got_sect + 1) {
err = asize != 4;
addr = elf_add_gsym_reloc(s, segment, addr, 0,
R_386_GOT32, true);
} else if (wrt == elf_sym_sect + 1) {
switch (asize) {
case 1:
addr = elf_add_gsym_reloc(s, segment, addr, 0,
R_386_8, false);
break;
case 2:
addr = elf_add_gsym_reloc(s, segment, addr, 0,
R_386_16, false);
break;
case 4:
addr = elf_add_gsym_reloc(s, segment, addr, 0,
R_386_32, false);
break;
default:
err = true;
break;
}
} else if (wrt == elf_plt_sect + 1) {
nasm_nonfatal("ELF format cannot produce non-PC-"
"relative PLT references");
} else {
nasm_nonfatal("ELF format does not support this"
" use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
}
}
}
if (err) {
nasm_nonfatal("Unsupported %d-bit ELF relocation", asize << 3);
}
elf_sect_writeaddr(s, addr, asize);
break;
}
case OUT_REL1ADR:
reltype = R_386_PC8;
bytes = 1;
goto rel12adr;
case OUT_REL2ADR:
reltype = R_386_PC16;
bytes = 2;
goto rel12adr;
rel12adr:
addr = *(int64_t *)data - size;
nasm_assert(segment != segto);
if (segment != NO_SEG && (segment & 1)) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
elf_add_reloc(s, segment, 0, reltype);
} else {
nasm_nonfatal("Unsupported %d-bit ELF relocation", bytes << 3);
}
}
elf_sect_writeaddr(s, addr, bytes);
break;
case OUT_REL4ADR:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL4ADR");
if (segment != NO_SEG && (segment & 1)) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
elf_add_reloc(s, segment, 0, R_386_PC32);
} else if (wrt == elf_plt_sect + 1) {
elf_add_reloc(s, segment, 0, R_386_PLT32);
} else if (wrt == elf_gotpc_sect + 1 ||
wrt == elf_gotoff_sect + 1 ||
wrt == elf_got_sect + 1) {
nasm_nonfatal("ELF format cannot produce PC-"
"relative GOT references");
} else {
nasm_nonfatal("ELF format does not support this"
" use of WRT");
wrt = NO_SEG; /* we can at least _try_ to continue */
}
}
elf_sect_writeaddr(s, addr, 4);
break;
case OUT_REL8ADR:
nasm_nonfatal("32-bit ELF format does not support 64-bit relocations");
addr = 0;
elf_sect_writeaddr(s, addr, 8);
break;
default:
panic();
}
}
static void elf64_out(int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t wrt)
{
struct elf_section *s;
int64_t addr;
int reltype, bytes;
static struct symlininfo sinfo;
/*
* handle absolute-assembly (structure definitions)
*/
if (segto == NO_SEG) {
if (type != OUT_RESERVE)
nasm_nonfatal("attempt to assemble code in [ABSOLUTE] space");
return;
}
s = raa_read_ptr(section_by_index, segto >> 1);
if (!s) {
int tempint; /* ignored */
if (segto != elf_section_names(".text", &tempint))
nasm_panic("strange segment conditions in ELF driver");
else
s = sects[nsects - 1];
}
/* again some stabs debugging stuff */
sinfo.offset = s->len;
sinfo.section = s->shndx;
sinfo.segto = segto;
sinfo.name = s->name;
dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo);
/* end of debugging stuff */
if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
nasm_warn(WARN_OTHER, "attempt to initialize memory in"
" BSS section `%s': ignored", s->name);
s->len += realsize(type, size);
return;
}
switch (type) {
case OUT_RESERVE:
if (s->type != SHT_NOBITS) {
nasm_warn(WARN_ZEROING, "uninitialized space declared in"
" non-BSS section `%s': zeroing", s->name);
elf_sect_write(s, NULL, size);
} else
s->len += size;
break;
case OUT_RAWDATA:
if (segment != NO_SEG)
nasm_panic("OUT_RAWDATA with other than NO_SEG");
elf_sect_write(s, data, size);
break;
case OUT_ADDRESS:
{
int isize = (int)size;
int asize = abs((int)size);
addr = *(int64_t *)data;
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
switch (isize) {
case 1:
case -1:
elf_add_reloc(s, segment, addr, R_X86_64_8);
break;
case 2:
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 -4:
elf_add_reloc(s, segment, addr, R_X86_64_32S);
break;
case 8:
case -8:
elf_add_reloc(s, segment, addr, R_X86_64_64);
break;
default:
nasm_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 (asize != 8) {
nasm_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 (asize) {
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:
nasm_nonfatal("invalid ..got reference");
break;
}
} else if (wrt == elf_sym_sect + 1) {
switch (isize) {
case 1:
case -1:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_8, false);
addr = 0;
break;
case 2:
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 -4:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_32S, false);
addr = 0;
break;
case 8:
case -8:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_64, false);
addr = 0;
break;
default:
nasm_panic("internal error elf64-hpa-903");
break;
}
} else if (wrt == elf_plt_sect + 1) {
nasm_nonfatal("ELF format cannot produce non-PC-"
"relative PLT references");
} else {
nasm_nonfatal("ELF format does not support this"
" use of WRT");
}
}
elf_sect_writeaddr(s, addr, asize);
break;
}
case OUT_REL1ADR:
reltype = R_X86_64_PC8;
bytes = 1;
goto rel12adr;
case OUT_REL2ADR:
reltype = R_X86_64_PC16;
bytes = 2;
goto rel12adr;
rel12adr:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL1ADR");
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
elf_add_reloc(s, segment, addr, reltype);
addr = 0;
} else {
nasm_nonfatal("Unsupported %d-bit ELF relocation", bytes << 3);
}
}
elf_sect_writeaddr(s, addr, bytes);
break;
case OUT_REL4ADR:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL4ADR");
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_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) {
nasm_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 {
nasm_nonfatal("ELF64 format does not support this"
" use of WRT");
}
}
elf_sect_writeaddr(s, addr, 4);
break;
case OUT_REL8ADR:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL8ADR");
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_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) {
nasm_nonfatal("ELF64 requires ..gotoff references to be "
"absolute");
} else if (wrt == elf_gottpoff_sect + 1) {
nasm_nonfatal("ELF64 requires ..gottpoff references to be "
"dword");
} else {
nasm_nonfatal("ELF64 format does not support this"
" use of WRT");
}
}
elf_sect_writeaddr(s, addr, 8);
break;
default:
panic();
}
}
static void elfx32_out(int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t wrt)
{
struct elf_section *s;
int64_t addr;
int reltype, bytes;
static struct symlininfo sinfo;
/*
* handle absolute-assembly (structure definitions)
*/
if (segto == NO_SEG) {
if (type != OUT_RESERVE)
nasm_nonfatal("attempt to assemble code in [ABSOLUTE] space");
return;
}
s = raa_read_ptr(section_by_index, segto >> 1);
if (!s) {
int tempint; /* ignored */
if (segto != elf_section_names(".text", &tempint))
nasm_panic("strange segment conditions in ELF driver");
else
s = sects[nsects - 1];
}
/* again some stabs debugging stuff */
sinfo.offset = s->len;
sinfo.section = s->shndx;
sinfo.segto = segto;
sinfo.name = s->name;
dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo);
/* end of debugging stuff */
if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
nasm_warn(WARN_OTHER, "attempt to initialize memory in"
" BSS section `%s': ignored", s->name);
s->len += realsize(type, size);
return;
}
switch (type) {
case OUT_RESERVE:
if (s->type != SHT_NOBITS) {
nasm_warn(WARN_ZEROING, "uninitialized space declared in"
" non-BSS section `%s': zeroing", s->name);
elf_sect_write(s, NULL, size);
} else
s->len += size;
break;
case OUT_RAWDATA:
if (segment != NO_SEG)
nasm_panic("OUT_RAWDATA with other than NO_SEG");
elf_sect_write(s, data, size);
break;
case OUT_ADDRESS:
{
int isize = (int)size;
int asize = abs((int)size);
addr = *(int64_t *)data;
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
switch (isize) {
case 1:
case -1:
elf_add_reloc(s, segment, addr, R_X86_64_8);
break;
case 2:
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 -4:
elf_add_reloc(s, segment, addr, R_X86_64_32S);
break;
case 8:
case -8:
elf_add_reloc(s, segment, addr, R_X86_64_64);
break;
default:
nasm_panic("internal error elfx32-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) {
nasm_nonfatal("ELFX32 doesn't support "
"R_X86_64_GOTOFF64");
} else if (wrt == elf_got_sect + 1) {
switch (asize) {
case 4:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_GOT32, true);
addr = 0;
break;
default:
nasm_nonfatal("invalid ..got reference");
break;
}
} else if (wrt == elf_sym_sect + 1) {
switch (isize) {
case 1:
case -1:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_8, false);
addr = 0;
break;
case 2:
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 -4:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_32S, false);
addr = 0;
break;
case 8:
case -8:
elf_add_gsym_reloc(s, segment, addr, 0,
R_X86_64_64, false);
addr = 0;
break;
default:
nasm_panic("internal error elfx32-hpa-903");
break;
}
} else if (wrt == elf_plt_sect + 1) {
nasm_nonfatal("ELF format cannot produce non-PC-"
"relative PLT references");
} else {
nasm_nonfatal("ELF format does not support this"
" use of WRT");
}
}
elf_sect_writeaddr(s, addr, asize);
break;
}
case OUT_REL1ADR:
reltype = R_X86_64_PC8;
bytes = 1;
goto rel12adr;
case OUT_REL2ADR:
reltype = R_X86_64_PC16;
bytes = 2;
goto rel12adr;
rel12adr:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL1ADR");
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_nonfatal("ELF format does not support"
" segment base references");
} else {
if (wrt == NO_SEG) {
elf_add_reloc(s, segment, addr, reltype);
addr = 0;
} else {
nasm_nonfatal("unsupported %d-bit ELF relocation", bytes << 3);
}
}
elf_sect_writeaddr(s, addr, bytes);
break;
case OUT_REL4ADR:
addr = *(int64_t *)data - size;
if (segment == segto)
nasm_panic("intra-segment OUT_REL4ADR");
if (segment == NO_SEG) {
/* Do nothing */
} else if (segment & 1) {
nasm_nonfatal("ELFX32 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) {
nasm_nonfatal("invalid ..gotoff reference");
} else if (wrt == elf_gottpoff_sect + 1) {
elf_add_gsym_reloc(s, segment, addr+size, size,
R_X86_64_GOTTPOFF, true);
addr = 0;
} else {
nasm_nonfatal("ELFX32 format does not support this use of WRT");
}
}
elf_sect_writeaddr(s, addr, 4);
break;
case OUT_REL8ADR:
nasm_nonfatal("32-bit ELF format does not support 64-bit relocations");
addr = 0;
elf_sect_writeaddr(s, addr, 8);
break;
default:
panic();
}
}
/*
* Section index/count with a specified overflow value (usually SHN_INDEX,
* but 0 for e_shnum.
*/
static inline uint16_t elf_shndx(int section, uint16_t overflow)
{
return cpu_to_le16(section < (int)SHN_LORESERVE ? section : overflow);
}
struct ehdr_common {
uint8_t e_ident[EI_NIDENT];
uint16_t e_type;
uint16_t e_machine;
uint32_t e_version;
};
union ehdr {
Elf32_Ehdr ehdr32;
Elf64_Ehdr ehdr64;
struct ehdr_common com;
};
static void elf_write(void)
{
int align;
char *p;
int i;
size_t symtablocal;
int sec_shstrtab, sec_symtab, sec_strtab;
union ehdr ehdr;
/*
* Add any sections we don't already have:
* rel/rela sections for the user sections, debug sections, and
* the ELF special sections.
*/
sec_debug = nsections;
if (dfmt_is_stabs()) {
/* in case the debug information is wanted, just add these three sections... */
add_sectname("", ".stab");
add_sectname("", ".stabstr");
add_sectname(efmt->relpfx, ".stab");
} else if (dfmt_is_dwarf()) {
/* the dwarf debug standard specifies the following ten sections,
not all of which are currently implemented,
although all of them are defined. */
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");
}
sec_shstrtab = add_sectname("", ".shstrtab");
sec_symtab = add_sectname("", ".symtab");
sec_strtab = add_sectname("", ".strtab");
/*
* Build the symbol table and relocation tables.
*/
symtablocal = elf_build_symtab();
/* Do we need an .symtab_shndx section? */
if (symtab_shndx)
add_sectname("", ".symtab_shndx");
for (i = 0; i < nsects; i++) {
if (sects[i]->head) {
add_sectname(efmt->relpfx, sects[i]->name);
sects[i]->rel = efmt->elf_build_reltab(sects[i]->head);
}
}
/*
* Output the ELF header.
*/
nasm_zero(ehdr);
/* These fields are in the same place for 32 and 64 bits */
memcpy(&ehdr.com.e_ident[EI_MAG0], ELFMAG, SELFMAG);
ehdr.com.e_ident[EI_CLASS] = efmt->ei_class;
ehdr.com.e_ident[EI_DATA] = ELFDATA2LSB;
ehdr.com.e_ident[EI_VERSION] = EV_CURRENT;
ehdr.com.e_ident[EI_OSABI] = elf_osabi;
ehdr.com.e_ident[EI_ABIVERSION] = elf_abiver;
ehdr.com.e_type = cpu_to_le16(ET_REL);
ehdr.com.e_machine = cpu_to_le16(efmt->e_machine);
ehdr.com.e_version = cpu_to_le16(EV_CURRENT);
if (!efmt->elf64) {
ehdr.ehdr32.e_shoff = cpu_to_le32(sizeof ehdr);
ehdr.ehdr32.e_ehsize = cpu_to_le16(sizeof(Elf32_Ehdr));
ehdr.ehdr32.e_shentsize = cpu_to_le16(sizeof(Elf32_Shdr));
ehdr.ehdr32.e_shnum = elf_shndx(nsections, 0);
ehdr.ehdr32.e_shstrndx = elf_shndx(sec_shstrtab, SHN_XINDEX);
} else {
ehdr.ehdr64.e_shoff = cpu_to_le64(sizeof ehdr);
ehdr.ehdr64.e_ehsize = cpu_to_le16(sizeof(Elf64_Ehdr));
ehdr.ehdr64.e_shentsize = cpu_to_le16(sizeof(Elf64_Shdr));
ehdr.ehdr64.e_shnum = elf_shndx(nsections, 0);
ehdr.ehdr64.e_shstrndx = elf_shndx(sec_shstrtab, SHN_XINDEX);
}
nasm_write(&ehdr, sizeof(ehdr), ofile);
elf_foffs = sizeof ehdr + efmt->shdr_size * nsections;
/*
* Now output the section header table.
*/
align = ALIGN(elf_foffs, SEC_FILEALIGN) - elf_foffs;
elf_foffs += align;
elf_nsect = 0;
elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
/* SHN_UNDEF */
elf_section_header(0, SHT_NULL, 0, NULL, false,
nsections > (int)SHN_LORESERVE ? nsections : 0,
sec_shstrtab >= (int)SHN_LORESERVE ? sec_shstrtab : 0,
0, 0, 0);
p = shstrtab + 1;
/* The normal sections */
for (i = 0; i < nsects; i++) {
elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
sects[i]->data, true,
sects[i]->len, 0, 0,
sects[i]->align, sects[i]->entsize);
p += strlen(p) + 1;
}
/* The debugging sections */
if (dfmt_is_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 */
stabs_generate();
if (stabbuf && stabstrbuf && stabrelbuf) {
elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false,
stablen, sec_stabstr, 0, 4, 12);
p += strlen(p) + 1;
elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false,
stabstrlen, 0, 0, 4, 0);
p += strlen(p) + 1;
/* link -> symtable info -> section to refer to */
elf_section_header(p - shstrtab, efmt->reltype, 0,
stabrelbuf, false, stabrellen,
sec_symtab, sec_stab,
efmt->word, efmt->rel_size);
p += strlen(p) + 1;
}
} else if (dfmt_is_dwarf()) {
/* for dwarf debugging information, create the ten dwarf sections */
/* this function call creates the dwarf sections in memory */
if (dwarf_fsect)
dwarf_generate();
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, sec_symtab,
sec_debug_aranges,
efmt->word, efmt->rela_size);
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, sec_symtab,
sec_debug_info,
efmt->word, efmt->rela_size);
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, sec_symtab,
sec_debug_line,
efmt->word, efmt->rela_size);
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);
p += strlen(p) + 1;
}
/* .shstrtab */
elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false,
shstrtablen, 0, 0, 1, 0);
p += strlen(p) + 1;
/* .symtab */
elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true,
symtab->datalen, sec_strtab, symtablocal,
efmt->word, efmt->sym_size);
p += strlen(p) + 1;
/* .strtab */
elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true,
strslen, 0, 0, 1, 0);
p += strlen(p) + 1
;
/* .symtab_shndx */
if (symtab_shndx) {
elf_section_header(p - shstrtab, SHT_SYMTAB_SHNDX, 0,
symtab_shndx, true, symtab_shndx->datalen,
sec_symtab, 0, 1, 0);
p += strlen(p) + 1;
}
/* The relocation sections */
for (i = 0; i < nsects; i++) {
if (sects[i]->rel) {
elf_section_header(p - shstrtab, efmt->reltype, 0,
sects[i]->rel, true, sects[i]->rel->datalen,
sec_symtab, sects[i]->shndx,
efmt->word, efmt->rel_size);
p += strlen(p) + 1;
}
}
fwritezero(align, ofile);
/*
* Now output the sections.
*/
elf_write_sections();
nasm_free(elf_sects);
saa_free(symtab);
if (symtab_shndx)
saa_free(symtab_shndx);
}
static size_t nsyms;
static void elf_sym(const struct elf_symbol *sym)
{
int shndx = sym->section;
/*
* Careful here. This relies on sym->section being signed; for
* special section indicies this value needs to be cast to
* (int16_t) so that it sign-extends, however, here SHN_LORESERVE
* is used as an unsigned constant.
*/
if (shndx >= (int)SHN_LORESERVE) {
if (unlikely(!symtab_shndx)) {
/* Create symtab_shndx and fill previous entries with zero */
symtab_shndx = saa_init(1);
saa_wbytes(symtab_shndx, NULL, nsyms << 2);
}
} else {
shndx = 0; /* Section index table always write zero */
}
if (symtab_shndx)
saa_write32(symtab_shndx, shndx);
efmt->elf_sym(sym);
nsyms++;
}
static void elf32_sym(const struct elf_symbol *sym)
{
Elf32_Sym sym32;
sym32.st_name = cpu_to_le32(sym->strpos);
sym32.st_value = cpu_to_le32(sym->symv.key);
sym32.st_size = cpu_to_le32(sym->size);
sym32.st_info = sym->type;
sym32.st_other = sym->other;
sym32.st_shndx = elf_shndx(sym->section, SHN_XINDEX);
saa_wbytes(symtab, &sym32, sizeof sym32);
}
static void elf64_sym(const struct elf_symbol *sym)
{
Elf64_Sym sym64;
sym64.st_name = cpu_to_le32(sym->strpos);
sym64.st_value = cpu_to_le64(sym->symv.key);
sym64.st_size = cpu_to_le64(sym->size);
sym64.st_info = sym->type;
sym64.st_other = sym->other;
sym64.st_shndx = elf_shndx(sym->section, SHN_XINDEX);
saa_wbytes(symtab, &sym64, sizeof sym64);
}
static size_t elf_build_symtab(void)
{
struct elf_symbol *sym, xsym;
size_t nlocal;
int i;
symtab = saa_init(1);
symtab_shndx = NULL;
/*
* Zero symbol first as required by spec.
*/
nasm_zero(xsym);
elf_sym(&xsym);
/*
* Next, an entry for the file name.
*/
nasm_zero(xsym);
xsym.strpos = 1;
xsym.type = ELF32_ST_INFO(STB_LOCAL, STT_FILE);
xsym.section = XSHN_ABS;
elf_sym(&xsym);
/*
* Now some standard symbols defining the segments, for relocation
* purposes.
*/
nasm_zero(xsym);
for (i = 1; i <= nsects; i++) {
xsym.type = ELF64_ST_INFO(STB_LOCAL, STT_SECTION);
xsym.section = i;
elf_sym(&xsym);
}
/*
* dwarf needs symbols for debug sections
* which are relocation targets.
*/
if (dfmt_is_dwarf()) {
dwarf_infosym = nsyms;
xsym.section = sec_debug_info;
elf_sym(&xsym);
dwarf_abbrevsym = nsyms;
xsym.section = sec_debug_abbrev;
elf_sym(&xsym);
dwarf_linesym = nsyms;
xsym.section = sec_debug_line;
elf_sym(&xsym);
}
/*
* Now the other local symbols.
*/
saa_rewind(syms);
while ((sym = saa_rstruct(syms))) {
if (sym->type & SYM_GLOBAL)
continue;
elf_sym(sym);
}
nlocal = nsyms;
/*
* Now the global symbols.
*/
saa_rewind(syms);
while ((sym = saa_rstruct(syms))) {
if (!(sym->type & SYM_GLOBAL))
continue;
elf_sym(sym);
}
return nlocal;
}
static struct SAA *elf32_build_reltab(const struct elf_reloc *r)
{
struct SAA *s;
int32_t global_offset;
Elf32_Rel rel32;
if (!r)
return NULL;
s = saa_init(1L);
/*
* How to onvert from a global placeholder to a real symbol index;
* the +2 refers to the two special entries, the null entry and
* the filename entry.
*/
global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
while (r) {
int32_t sym = r->symbol;
if (sym >= GLOBAL_TEMP_BASE)
sym += global_offset;
rel32.r_offset = cpu_to_le32(r->address);
rel32.r_info = cpu_to_le32(ELF32_R_INFO(sym, r->type));
saa_wbytes(s, &rel32, sizeof rel32);
r = r->next;
}
return s;
}
static struct SAA *elfx32_build_reltab(const struct elf_reloc *r)
{
struct SAA *s;
int32_t global_offset;
Elf32_Rela rela32;
if (!r)
return NULL;
s = saa_init(1L);
/*
* How to onvert from a global placeholder to a real symbol index;
* the +2 refers to the two special entries, the null entry and
* the filename entry.
*/
global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
while (r) {
int32_t sym = r->symbol;
if (sym >= GLOBAL_TEMP_BASE)
sym += global_offset;
rela32.r_offset = cpu_to_le32(r->address);
rela32.r_info = cpu_to_le32(ELF32_R_INFO(sym, r->type));
rela32.r_addend = cpu_to_le32(r->offset);
saa_wbytes(s, &rela32, sizeof rela32);
r = r->next;
}
return s;
}
static struct SAA *elf64_build_reltab(const struct elf_reloc *r)
{
struct SAA *s;
int32_t global_offset;
Elf64_Rela rela64;
if (!r)
return NULL;
s = saa_init(1L);
/*
* How to onvert from a global placeholder to a real symbol index;
* the +2 refers to the two special entries, the null entry and
* the filename entry.
*/
global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
while (r) {
int32_t sym = r->symbol;
if (sym >= GLOBAL_TEMP_BASE)
sym += global_offset;
rela64.r_offset = cpu_to_le64(r->address);
rela64.r_info = cpu_to_le64(ELF64_R_INFO(sym, r->type));
rela64.r_addend = cpu_to_le64(r->offset);
saa_wbytes(s, &rela64, sizeof rela64);
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,
uint64_t align, uint64_t entsize)
{
elf_sects[elf_nsect].data = data;
elf_sects[elf_nsect].len = datalen;
elf_sects[elf_nsect].is_saa = is_saa;
elf_nsect++;
if (!efmt->elf64) {
Elf32_Shdr shdr;
shdr.sh_name = cpu_to_le32(name);
shdr.sh_type = cpu_to_le32(type);
shdr.sh_flags = cpu_to_le32(flags);
shdr.sh_addr = 0;
shdr.sh_offset = cpu_to_le32(type == SHT_NULL ? 0 : elf_foffs);
shdr.sh_size = cpu_to_le32(datalen);
if (data)
elf_foffs += ALIGN(datalen, SEC_FILEALIGN);
shdr.sh_link = cpu_to_le32(link);
shdr.sh_info = cpu_to_le32(info);
shdr.sh_addralign = cpu_to_le32(align);
shdr.sh_entsize = cpu_to_le32(entsize);
nasm_write(&shdr, sizeof shdr, ofile);
} else {
Elf64_Shdr shdr;
shdr.sh_name = cpu_to_le32(name);
shdr.sh_type = cpu_to_le32(type);
shdr.sh_flags = cpu_to_le64(flags);
shdr.sh_addr = 0;
shdr.sh_offset = cpu_to_le64(type == SHT_NULL ? 0 : elf_foffs);
shdr.sh_size = cpu_to_le64(datalen);
if (data)
elf_foffs += ALIGN(datalen, SEC_FILEALIGN);
shdr.sh_link = cpu_to_le32(link);
shdr.sh_info = cpu_to_le32(info);
shdr.sh_addralign = cpu_to_le64(align);
shdr.sh_entsize = cpu_to_le64(entsize);
nasm_write(&shdr, sizeof shdr, ofile);
}
}
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 = ALIGN(len, SEC_FILEALIGN);
int32_t align = reallen - len;
if (elf_sects[i].is_saa)
saa_fpwrite(elf_sects[i].data, ofile);
else
nasm_write(elf_sects[i].data, len, ofile);
fwritezero(align, ofile);
}
}
static void elf_sect_write(struct elf_section *sect, const void *data, size_t len)
{
saa_wbytes(sect->data, data, len);
sect->len += len;
}
static void elf_sect_writeaddr(struct elf_section *sect, int64_t data, size_t len)
{
saa_writeaddr(sect->data, data, len);
sect->len += len;
}
static void elf_sectalign(int32_t seg, unsigned int value)
{
struct elf_section *s;
s = raa_read_ptr(section_by_index, seg >> 1);
if (!s || !is_power2(value))
return;
if (value > s->align)
s->align = value;
}
extern macros_t elf_stdmac[];
/* Claim "elf" as a pragma namespace, for the future */
static const struct pragma_facility elf_pragma_list[] =
{
{ "elf", NULL },
{ NULL, NULL } /* Implements the canonical output name */
};
static const struct dfmt elf32_df_dwarf = {
"ELF32 (i386) dwarf (newer)",
"dwarf",
dwarf_init,
dwarf_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
dwarf_output,
dwarf_cleanup,
NULL /* pragma list */
};
static const struct dfmt elf32_df_stabs = {
"ELF32 (i386) stabs (older)",
"stabs",
null_debug_init,
stabs_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
stabs_output,
stabs_cleanup,
NULL /* pragma list */
};
static const struct dfmt * const elf32_debugs_arr[3] =
{ &elf32_df_dwarf, &elf32_df_stabs, NULL };
const struct ofmt of_elf32 = {
"ELF32 (i386) (Linux, most Unix variants)",
"elf32",
".o",
0,
32,
elf32_debugs_arr,
&elf32_df_dwarf,
elf_stdmac,
elf32_init,
null_reset,
nasm_do_legacy_output,
elf32_out,
elf_deflabel,
elf_section_names,
NULL,
elf_sectalign,
null_segbase,
elf_directive,
elf_cleanup,
elf_pragma_list,
};
static const struct dfmt elf64_df_dwarf = {
"ELF64 (x86-64) dwarf (newer)",
"dwarf",
dwarf_init,
dwarf_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
dwarf_output,
dwarf_cleanup,
NULL /* pragma list */
};
static const struct dfmt elf64_df_stabs = {
"ELF64 (x86-64) stabs (older)",
"stabs",
null_debug_init,
stabs_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
stabs_output,
stabs_cleanup,
NULL /* pragma list */
};
static const struct dfmt * const elf64_debugs_arr[3] =
{ &elf64_df_dwarf, &elf64_df_stabs, NULL };
const struct ofmt of_elf64 = {
"ELF64 (x86-64) (Linux, most Unix variants)",
"elf64",
".o",
0,
64,
elf64_debugs_arr,
&elf64_df_dwarf,
elf_stdmac,
elf64_init,
null_reset,
nasm_do_legacy_output,
elf64_out,
elf_deflabel,
elf_section_names,
NULL,
elf_sectalign,
null_segbase,
elf_directive,
elf_cleanup,
elf_pragma_list,
};
static const struct dfmt elfx32_df_dwarf = {
"ELFx32 (x86-64) dwarf (newer)",
"dwarf",
dwarf_init,
dwarf_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
dwarf_output,
dwarf_cleanup,
NULL /* pragma list */
};
static const struct dfmt elfx32_df_stabs = {
"ELFx32 (x86-64) stabs (older)",
"stabs",
null_debug_init,
stabs_linenum,
null_debug_deflabel,
null_debug_directive,
debug_typevalue,
stabs_output,
stabs_cleanup,
elf_pragma_list,
};
static const struct dfmt * const elfx32_debugs_arr[3] =
{ &elfx32_df_dwarf, &elfx32_df_stabs, NULL };
const struct ofmt of_elfx32 = {
"ELFx32 (ELF32 for x86-64) (Linux)",
"elfx32",
".o",
0,
64,
elfx32_debugs_arr,
&elfx32_df_dwarf,
elf_stdmac,
elfx32_init,
null_reset,
nasm_do_legacy_output,
elfx32_out,
elf_deflabel,
elf_section_names,
NULL,
elf_sectalign,
null_segbase,
elf_directive,
elf_cleanup,
NULL /* pragma list */
};
static bool is_elf64(void)
{
return ofmt == &of_elf64;
}
static bool is_elf32(void)
{
return ofmt == &of_elf32;
}
static bool is_elfx32(void)
{
return ofmt == &of_elfx32;
}
static bool dfmt_is_stabs(void)
{
return dfmt == &elf32_df_stabs ||
dfmt == &elfx32_df_stabs ||
dfmt == &elf64_df_stabs;
}
static bool dfmt_is_dwarf(void)
{
return dfmt == &elf32_df_dwarf ||
dfmt == &elfx32_df_dwarf ||
dfmt == &elf64_df_dwarf;
}
/* common debugging routines */
static void debug_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_YWORD:
ssize = 32;
stype = STT_OBJECT;
break;
case TY_ZWORD:
ssize = 64;
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 */
static void stabs_linenum(const char *filename, int32_t linenumber, int32_t segto)
{
(void)segto;
if (!stabs_filename) {
stabs_filename = 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 = nasm_malloc(strlen(filename) + 1);
strcpy(stabs_filename, filename);
}
}
debug_immcall = 1;
currentline = linenumber;
}
static void stabs_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 = 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;
}
/* for creating the .stab , .stabstr and .rel.stab sections in memory */
static void stabs_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 = nasm_zalloc(numlinestabs * sizeof(char *));
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 = nasm_malloc(numfiles * sizeof(int));
for (i = 0; i < numfiles; i++) {
fileidx[i] = strsize;
strsize += strlen(allfiles[i]) + 1;
}
currfile = mainfileindex = 0;
for (i = 0; i < numfiles; i++) {
if (!strcmp(allfiles[i], elf_module)) {
currfile = 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
* plus one "ending" entry
*/
sbuf = nasm_malloc((numlinestabs * 2 + 4) *
sizeof(struct stabentry));
ssbuf = nasm_malloc(strsize);
rbuf = nasm_malloc(numlinestabs * (is_elf64() ? 16 : 8) * (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, stabstrlen);
/* 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
*/
if (is_elf32()) {
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
} else if (is_elfx32()) {
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32);
WRITELONG(rptr, 0);
} else {
nasm_assert(is_elf64());
WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
WRITELONG(rptr, R_X86_64_32);
WRITELONG(rptr, ptr->info.section + 2);
WRITEDLONG(rptr, 0);
}
numstabs++;
}
if (is_elf32()) {
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 */
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
}
WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
numstabs++;
/* relocation table entry */
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
ptr = ptr->next;
}
} else if (is_elfx32()) {
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 */
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32);
WRITELONG(rptr, ptr->info.offset);
}
WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
numstabs++;
/* relocation table entry */
WRITELONG(rptr, (sptr - sbuf) - 4);
WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_X86_64_32);
WRITELONG(rptr, ptr->info.offset);
ptr = ptr->next;
}
} else {
nasm_assert(is_elf64());
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);
WRITEDLONG(rptr, ptr->info.offset);
}
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);
WRITEDLONG(rptr, ptr->info.offset);
ptr = ptr->next;
}
}
/* this is an "ending" token */
WRITE_STAB(sptr, 0, N_SO, 0, 0, 0);
numstabs++;
((struct stabentry *)sbuf)->n_desc = numstabs;
nasm_free(allfiles);
nasm_free(fileidx);
stablen = (sptr - sbuf);
stabrellen = (rptr - rbuf);
stabrelbuf = rbuf;
stabbuf = sbuf;
stabstrbuf = ssbuf;
}
static void stabs_cleanup(void)
{
struct linelist *ptr, *del;
if (!stabslines)
return;
ptr = stabslines;
while (ptr) {
del = ptr;
ptr = ptr->next;
nasm_free(del);
}
nasm_free(stabbuf);
nasm_free(stabrelbuf);
nasm_free(stabstrbuf);
}
/* dwarf routines */
static void dwarf_init(void)
{
ndebugs = 3; /* 3 debug symbols */
}
static void dwarf_linenum(const char *filename, int32_t linenumber,
int32_t segto)
{
(void)segto;
dwarf_findfile(filename);
debug_immcall = 1;
currentline = linenumber;
}
/* called from elf_out with type == TY_DEBUGSYMLIN */
static void dwarf_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)))
dwarf_findsect(s->section);
/* do nothing unless line or file has changed */
if (!debug_immcall)
return;
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 {
saa_write8(plinep,DW_LNS_advance_line);
saa_wleb128s(plinep,ln);
if (aa) {
saa_write8(plinep,DW_LNS_advance_pc);
saa_wleb128u(plinep,aa);
}
saa_write8(plinep,DW_LNS_copy);
}
dwarf_csect->line = currentline;
dwarf_csect->offset = s->offset;
}
/* show change handled */
debug_immcall = 0;
}
static void dwarf_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;
if (is_elf32()) {
/* write epilogues for each line program range */
/* and build aranges section */
paranges = saa_init(1L);
parangesrel = saa_init(1L);
saa_write16(paranges,2); /* dwarf version */
saa_write32(parangesrel, paranges->datalen+4);
saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
saa_write32(parangesrel, 0);
saa_write32(paranges,0); /* offset into info */
saa_write8(paranges,4); /* 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_write32(parangesrel, paranges->datalen + 4);
saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
saa_write32(parangesrel, (uint32_t) 0);
/* range table entry */
saa_write32(paranges,0x0000); /* range start */
saa_write32(paranges,sects[psect->section]->len); /* range length */
highaddr += sects[psect->section]->len;
/* done with this entry */
psect = psect->next;
}
saa_write32(paranges,0); /* null address */
saa_write32(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);
} else if (is_elfx32()) {
/* 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_write32(parangesrel, paranges->datalen+4);
saa_write32(parangesrel, (dwarf_infosym << 8) + R_X86_64_32); /* reloc to info */
saa_write32(parangesrel, 0);
saa_write32(paranges,0); /* offset into info */
saa_write8(paranges,4); /* 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_write32(parangesrel, paranges->datalen + 4);
saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_X86_64_32);
saa_write32(parangesrel, (uint32_t) 0);
/* range table entry */
saa_write32(paranges,0x0000); /* range start */
saa_write32(paranges,sects[psect->section]->len); /* range length */
highaddr += sects[psect->section]->len;
/* done with this entry */
psect = psect->next;
}
saa_write32(paranges,0); /* null address */
saa_write32(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);
} else {
nasm_assert(is_elf64());
/* 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);
if (is_elf32()) {
/* build info section */
pinfo = saa_init(1L);
pinforel = saa_init(1L);
saa_write16(pinfo,2); /* dwarf version */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* offset into abbrev */
saa_write8(pinfo,4); /* pointer size */
saa_write8(pinfo,1); /* abbrviation number LEB128u */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_low_pc */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_stmt_list */
saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
saa_wbytes(pinfo, nasm_signature(), nasm_signature_len()+1);
saa_write16(pinfo,DW_LANG_Mips_Assembler);
saa_write8(pinfo,2); /* abbrviation number LEB128u */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_low_pc */
saa_write32(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);
} else if (is_elfx32()) {
/* build info section */
pinfo = saa_init(1L);
pinforel = saa_init(1L);
saa_write16(pinfo,3); /* dwarf version */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_X86_64_32); /* reloc to abbrev */
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* offset into abbrev */
saa_write8(pinfo,4); /* pointer size */
saa_write8(pinfo,1); /* abbrviation number LEB128u */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_low_pc */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, (dwarf_linesym << 8) + R_X86_64_32); /* reloc to line */
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_stmt_list */
saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
saa_wbytes(pinfo, nasm_signature(), nasm_signature_len()+1);
saa_write16(pinfo,DW_LANG_Mips_Assembler);
saa_write8(pinfo,2); /* abbrviation number LEB128u */
saa_write32(pinforel, pinfo->datalen + 4);
saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_X86_64_32);
saa_write32(pinforel, 0);
saa_write32(pinfo,0); /* DW_AT_low_pc */
saa_write32(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);
} else {
nasm_assert(is_elf64());
/* 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(), nasm_signature_len()+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 */
/* Terminal zero entry */
saa_write8(pabbrev,0);
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;
if (is_elf32()) {
for (indx = 0; indx < dwarf_nsections; indx++) {
saa_write32(plinesrel, linepoff);
saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
saa_write32(plinesrel, (uint32_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;
}
} else if (is_elfx32()) {
for (indx = 0; indx < dwarf_nsections; indx++) {
saa_write32(plinesrel, linepoff);
saa_write32(plinesrel, ((psect->section + 2) << 8) + R_X86_64_32);
saa_write32(plinesrel, 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;
}
} else {
nasm_assert(is_elf64());
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);
if (is_elf32()) {
WRITELONG(pbuf,0); /* null beginning offset */
WRITELONG(pbuf,0); /* null ending offset */
} else if (is_elfx32()) {
WRITELONG(pbuf,0); /* null beginning offset */
WRITELONG(pbuf,0); /* null ending offset */
} else {
nasm_assert(is_elf64());
WRITEDLONG(pbuf,0); /* null beginning offset */
WRITEDLONG(pbuf,0); /* null ending offset */
}
}
static void dwarf_cleanup(void)
{
nasm_free(arangesbuf);
nasm_free(arangesrelbuf);
nasm_free(pubnamesbuf);
nasm_free(infobuf);
nasm_free(inforelbuf);
nasm_free(abbrevbuf);
nasm_free(linebuf);
nasm_free(linerelbuf);
nasm_free(framebuf);
nasm_free(locbuf);
}
static void dwarf_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 */
match = 0;
if (dwarf_flist) {
match = dwarf_flist;
for (finx = 0; finx < dwarf_numfiles; finx++) {
if (!(strcmp(fname, match->filename))) {
dwarf_clist = match;
return;
}
match = match->next;
}
}
/* add file name to end of list */
dwarf_clist = 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 (!dwarf_flist) { /* if first entry */
dwarf_flist = dwarf_elist = dwarf_clist;
dwarf_clist->last = 0;
} else { /* chain to previous entry */
dwarf_elist->next = dwarf_clist;
dwarf_elist = dwarf_clist;
}
}
static void dwarf_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 */
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 = 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,is_elf64() ? 9 : 5); /* operand length */
saa_write8(plinep,DW_LNE_set_address);
if (is_elf64())
saa_write64(plinep,0); /* Start Address */
else
saa_write32(plinep,0); /* Start Address */
if (!dwarf_fsect) { /* if first entry */
dwarf_fsect = dwarf_esect = dwarf_csect;
dwarf_csect->last = 0;
} else { /* chain to previous entry */
dwarf_esect->next = dwarf_csect;
dwarf_esect = dwarf_csect;
}
}
#endif /* defined(OF_ELF32) || defined(OF_ELF64) || defined(OF_ELFX32) */
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