mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
07d6d2b834
Binutils is supposed to use tabs. In my git config I have whitespace = indent-with-non-tab,space-before-tab,trailing-space and I got annoyed enough seeing red in "git diff" output to fix the problems. * doc/header.sed: Trim trailing space when splitting lines. * aix386-core.c, * aout-adobe.c, * aout-arm.c, * aout-cris.c, * aout-ns32k.c, * aout-target.h, * aout-tic30.c, * aoutf1.h, * aoutx.h, * arc-got.h, * arc-plt.def, * arc-plt.h, * archive.c, * archive64.c, * archures.c, * armnetbsd.c, * bfd-in.h, * bfd.c, * bfdio.c, * binary.c, * bout.c, * cache.c, * cisco-core.c, * coff-alpha.c, * coff-apollo.c, * coff-arm.c, * coff-h8300.c, * coff-i386.c, * coff-i860.c, * coff-i960.c, * coff-m68k.c, * coff-m88k.c, * coff-mcore.c, * coff-mips.c, * coff-ppc.c, * coff-rs6000.c, * coff-sh.c, * coff-stgo32.c, * coff-tic4x.c, * coff-tic54x.c, * coff-tic80.c, * coff-we32k.c, * coff-x86_64.c, * coff-z80.c, * coff-z8k.c, * coff64-rs6000.c, * coffcode.h, * coffgen.c, * cofflink.c, * coffswap.h, * compress.c, * corefile.c, * cpu-alpha.c, * cpu-arm.c, * cpu-avr.c, * cpu-bfin.c, * cpu-cr16.c, * cpu-cr16c.c, * cpu-crx.c, * cpu-d10v.c, * cpu-frv.c, * cpu-ft32.c, * cpu-i370.c, * cpu-i960.c, * cpu-ia64-opc.c, * cpu-ip2k.c, * cpu-lm32.c, * cpu-m32r.c, * cpu-mcore.c, * cpu-microblaze.c, * cpu-mips.c, * cpu-moxie.c, * cpu-mt.c, * cpu-nios2.c, * cpu-ns32k.c, * cpu-or1k.c, * cpu-powerpc.c, * cpu-pru.c, * cpu-sh.c, * cpu-spu.c, * cpu-v850.c, * cpu-v850_rh850.c, * cpu-xgate.c, * cpu-z80.c, * dwarf1.c, * dwarf2.c, * ecoff.c, * ecofflink.c, * ecoffswap.h, * elf-bfd.h, * elf-eh-frame.c, * elf-hppa.h, * elf-m10200.c, * elf-m10300.c, * elf-s390-common.c, * elf-strtab.c, * elf-vxworks.c, * elf.c, * elf32-am33lin.c, * elf32-arc.c, * elf32-arm.c, * elf32-avr.c, * elf32-avr.h, * elf32-bfin.c, * elf32-cr16.c, * elf32-cr16c.c, * elf32-cris.c, * elf32-crx.c, * elf32-d10v.c, * elf32-d30v.c, * elf32-dlx.c, * elf32-epiphany.c, * elf32-fr30.c, * elf32-frv.c, * elf32-ft32.c, * elf32-h8300.c, * elf32-hppa.c, * elf32-i386.c, * elf32-i860.c, * elf32-i960.c, * elf32-ip2k.c, * elf32-lm32.c, * elf32-m32c.c, * elf32-m32r.c, * elf32-m68hc11.c, * elf32-m68hc12.c, * elf32-m68hc1x.c, * elf32-m68hc1x.h, * elf32-m68k.c, * elf32-m88k.c, * elf32-mcore.c, * elf32-mep.c, * elf32-metag.c, * elf32-microblaze.c, * elf32-mips.c, * elf32-moxie.c, * elf32-msp430.c, * elf32-mt.c, * elf32-nds32.c, * elf32-nds32.h, * elf32-nios2.c, * elf32-or1k.c, * elf32-pj.c, * elf32-ppc.c, * elf32-ppc.h, * elf32-pru.c, * elf32-rl78.c, * elf32-rx.c, * elf32-s390.c, * elf32-score.c, * elf32-score.h, * elf32-score7.c, * elf32-sh-symbian.c, * elf32-sh.c, * elf32-sh64.c, * elf32-sparc.c, * elf32-spu.c, * elf32-tic6x.c, * elf32-tilegx.c, * elf32-tilegx.h, * elf32-tilepro.c, * elf32-tilepro.h, * elf32-v850.c, * elf32-vax.c, * elf32-wasm32.c, * elf32-xc16x.c, * elf32-xgate.c, * elf32-xgate.h, * elf32-xstormy16.c, * elf32-xtensa.c, * elf64-alpha.c, * elf64-hppa.c, * elf64-ia64-vms.c, * elf64-mips.c, * elf64-mmix.c, * elf64-ppc.c, * elf64-s390.c, * elf64-sh64.c, * elf64-sparc.c, * elf64-tilegx.c, * elf64-tilegx.h, * elf64-x86-64.c, * elfcore.h, * elflink.c, * elfn32-mips.c, * elfnn-aarch64.c, * elfnn-ia64.c, * elfnn-riscv.c, * elfxx-aarch64.c, * elfxx-aarch64.h, * elfxx-ia64.c, * elfxx-ia64.h, * elfxx-mips.c, * elfxx-riscv.c, * elfxx-sparc.c, * elfxx-tilegx.c, * elfxx-x86.c, * elfxx-x86.h, * freebsd.h, * hash.c, * host-aout.c, * hp300hpux.c, * hppabsd-core.c, * hpux-core.c, * i386aout.c, * i386linux.c, * i386lynx.c, * i386mach3.c, * i386msdos.c, * i386netbsd.c, * ieee.c, * ihex.c, * irix-core.c, * libaout.h, * libbfd-in.h, * libbfd.c, * libcoff-in.h, * libnlm.h, * libpei.h, * libxcoff.h, * linker.c, * lynx-core.c, * m68k4knetbsd.c, * m68klinux.c, * m68knetbsd.c, * m88kmach3.c, * mach-o-aarch64.c, * mach-o-arm.c, * mach-o-i386.c, * mach-o-target.c, * mach-o-x86-64.c, * mach-o.c, * mach-o.h, * merge.c, * mipsbsd.c, * mmo.c, * netbsd.h, * netbsd-core.c, * newsos3.c, * nlm-target.h, * nlm32-ppc.c, * nlm32-sparc.c, * nlmcode.h, * ns32k.h, * ns32knetbsd.c, * oasys.c, * opncls.c, * pc532-mach.c, * pdp11.c, * pe-arm.c, * pe-i386.c, * pe-mcore.c, * pe-mips.c, * pe-x86_64.c, * peXXigen.c, * pef.c, * pef.h, * pei-arm.c, * pei-i386.c, * pei-mcore.c, * pei-x86_64.c, * peicode.h, * plugin.c, * ppcboot.c, * ptrace-core.c, * reloc.c, * riscix.c, * rs6000-core.c, * section.c, * som.c, * som.h, * sparclinux.c, * sparcnetbsd.c, * srec.c, * stabs.c, * sunos.c, * syms.c, * targets.c, * tekhex.c, * trad-core.c, * vax1knetbsd.c, * vaxnetbsd.c, * verilog.c, * versados.c, * vms-alpha.c, * vms-lib.c, * vms-misc.c, * wasm-module.c, * wasm-module.h, * xcofflink.c, * xsym.c, * xsym.h: Whitespace fixes. * bfd-in2.h, * libbfd.h, * libcoff.h: Regenerate.
840 lines
20 KiB
C
840 lines
20 KiB
C
/* BFD back-end for WebAssembly modules.
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Copyright (C) 2017 Free Software Foundation, Inc.
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Based on srec.c, mmo.c, and binary.c
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* The WebAssembly module format is a simple object file format
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including up to 11 numbered sections, plus any number of named
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"custom" sections. It is described at:
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https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md. */
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#include "sysdep.h"
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#include "alloca-conf.h"
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#include "bfd.h"
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#include "sysdep.h"
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#include <limits.h>
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#include "bfd_stdint.h"
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#include "libiberty.h"
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#include "libbfd.h"
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#include "wasm-module.h"
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typedef struct
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{
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asymbol * symbols;
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bfd_size_type symcount;
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} tdata_type;
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static const char * const wasm_numbered_sections[] =
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{
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NULL, /* Custom section, different layout. */
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WASM_SECTION ( 1, "type"),
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WASM_SECTION ( 2, "import"),
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WASM_SECTION ( 3, "function"),
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WASM_SECTION ( 4, "table"),
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WASM_SECTION ( 5, "memory"),
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WASM_SECTION ( 6, "global"),
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WASM_SECTION ( 7, "export"),
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WASM_SECTION ( 8, "start"),
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WASM_SECTION ( 9, "element"),
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WASM_SECTION (10, "code"),
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WASM_SECTION (11, "data"),
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};
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#define WASM_NUMBERED_SECTIONS ARRAY_SIZE (wasm_numbered_sections)
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/* Resolve SECTION_CODE to a section name if there is one, NULL
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otherwise. */
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static const char *
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wasm_section_code_to_name (bfd_byte section_code)
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{
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if (section_code < WASM_NUMBERED_SECTIONS)
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return wasm_numbered_sections[section_code];
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return NULL;
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}
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/* Translate section name NAME to a section code, or 0 if it's a
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custom name. */
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static unsigned int
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wasm_section_name_to_code (const char *name)
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{
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unsigned i;
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for (i = 1; i < WASM_NUMBERED_SECTIONS; i++)
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if (strcmp (name, wasm_numbered_sections[i]) == 0)
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return i;
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return 0;
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}
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/* WebAssembly LEB128 integers are sufficiently like DWARF LEB128
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integers that we use _bfd_safe_read_leb128, but there are two
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points of difference:
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- WebAssembly requires a 32-bit value to be encoded in at most 5
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bytes, etc.
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- _bfd_safe_read_leb128 accepts incomplete LEB128 encodings at the
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end of the buffer, while these are invalid in WebAssembly.
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Those differences mean that we will accept some files that are
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invalid WebAssembly. */
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/* Read an LEB128-encoded integer from ABFD's I/O stream, reading one
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byte at a time. Set ERROR_RETURN if no complete integer could be
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read, LENGTH_RETURN to the number of bytes read (including bytes in
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incomplete numbers). SIGN means interpret the number as SLEB128. */
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static bfd_vma
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wasm_read_leb128 (bfd * abfd,
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bfd_boolean * error_return,
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unsigned int * length_return,
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bfd_boolean sign)
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{
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bfd_vma result = 0;
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unsigned int num_read = 0;
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unsigned int shift = 0;
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unsigned char byte = 0;
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bfd_boolean success = FALSE;
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while (bfd_bread (&byte, 1, abfd) == 1)
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{
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num_read++;
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result |= ((bfd_vma) (byte & 0x7f)) << shift;
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shift += 7;
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if ((byte & 0x80) == 0)
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{
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success = TRUE;
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break;
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}
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}
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if (length_return != NULL)
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*length_return = num_read;
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if (error_return != NULL)
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*error_return = ! success;
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if (sign && (shift < 8 * sizeof (result)) && (byte & 0x40))
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result |= -((bfd_vma) 1 << shift);
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return result;
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}
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/* Encode an integer V as LEB128 and write it to ABFD, return TRUE on
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success. */
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static bfd_boolean
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wasm_write_uleb128 (bfd *abfd, bfd_vma v)
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{
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do
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{
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bfd_byte c = v & 0x7f;
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v >>= 7;
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if (v)
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c |= 0x80;
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if (bfd_bwrite (&c, 1, abfd) != 1)
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return FALSE;
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}
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while (v);
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return TRUE;
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}
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/* Read the LEB128 integer at P, saving it to X; at end of buffer,
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jump to error_return. */
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#define READ_LEB128(x, p, end) \
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do \
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{ \
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unsigned int length_read; \
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(x) = _bfd_safe_read_leb128 (abfd, (p), &length_read, \
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FALSE, (end)); \
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(p) += length_read; \
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if (length_read == 0) \
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goto error_return; \
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} \
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while (0)
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/* Verify the magic number at the beginning of a WebAssembly module
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ABFD, setting ERRORPTR if there's a mismatch. */
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static bfd_boolean
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wasm_read_magic (bfd *abfd, bfd_boolean *errorptr)
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{
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bfd_byte magic_const[SIZEOF_WASM_MAGIC] = WASM_MAGIC;
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bfd_byte magic[SIZEOF_WASM_MAGIC];
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if (bfd_bread (magic, sizeof (magic), abfd) == sizeof (magic)
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&& memcmp (magic, magic_const, sizeof (magic)) == 0)
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return TRUE;
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*errorptr = TRUE;
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return FALSE;
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}
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/* Read the version number from ABFD, returning TRUE if it's a supported
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version. Set ERRORPTR otherwise. */
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static bfd_boolean
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wasm_read_version (bfd *abfd, bfd_boolean *errorptr)
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{
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bfd_byte vers_const[SIZEOF_WASM_VERSION] = WASM_VERSION;
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bfd_byte vers[SIZEOF_WASM_VERSION];
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if (bfd_bread (vers, sizeof (vers), abfd) == sizeof (vers)
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/* Don't attempt to parse newer versions, which are likely to
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require code changes. */
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&& memcmp (vers, vers_const, sizeof (vers)) == 0)
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return TRUE;
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*errorptr = TRUE;
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return FALSE;
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}
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/* Read the WebAssembly header (magic number plus version number) from
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ABFD, setting ERRORPTR to TRUE if there is a mismatch. */
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static bfd_boolean
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wasm_read_header (bfd *abfd, bfd_boolean *errorptr)
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{
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if (! wasm_read_magic (abfd, errorptr))
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return FALSE;
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if (! wasm_read_version (abfd, errorptr))
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return FALSE;
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return TRUE;
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}
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/* Scan the "function" subsection of the "name" section ASECT in the
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wasm module ABFD. Create symbols. Return TRUE on success. */
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static bfd_boolean
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wasm_scan_name_function_section (bfd *abfd, sec_ptr asect)
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{
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bfd_byte *p;
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bfd_byte *end;
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bfd_vma payload_size;
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bfd_vma symcount = 0;
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tdata_type *tdata = abfd->tdata.any;
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asymbol *symbols = NULL;
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sec_ptr space_function_index;
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if (! asect)
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return FALSE;
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if (strcmp (asect->name, WASM_NAME_SECTION) != 0)
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return FALSE;
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p = asect->contents;
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end = asect->contents + asect->size;
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if (! p)
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return FALSE;
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while (p < end)
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{
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bfd_byte subsection_code = *p++;
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if (subsection_code == WASM_FUNCTION_SUBSECTION)
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break;
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/* subsection_code is documented to be a varuint7, meaning that
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it has to be a single byte in the 0 - 127 range. If it isn't,
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the spec must have changed underneath us, so give up. */
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if (subsection_code & 0x80)
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return FALSE;
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READ_LEB128 (payload_size, p, end);
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if (p > p + payload_size)
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return FALSE;
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p += payload_size;
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}
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if (p >= end)
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return FALSE;
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READ_LEB128 (payload_size, p, end);
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if (p > p + payload_size)
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return FALSE;
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if (p + payload_size > end)
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return FALSE;
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end = p + payload_size;
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READ_LEB128 (symcount, p, end);
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/* Sanity check: each symbol has at least two bytes. */
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if (symcount > payload_size/2)
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return FALSE;
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tdata->symcount = symcount;
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space_function_index = bfd_make_section_with_flags
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(abfd, WASM_SECTION_FUNCTION_INDEX, SEC_READONLY | SEC_CODE);
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if (! space_function_index)
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space_function_index = bfd_get_section_by_name (abfd, WASM_SECTION_FUNCTION_INDEX);
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if (! space_function_index)
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return FALSE;
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symbols = bfd_zalloc (abfd, tdata->symcount * sizeof (asymbol));
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if (! symbols)
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return FALSE;
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for (symcount = 0; p < end && symcount < tdata->symcount; symcount++)
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{
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bfd_vma index;
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bfd_vma len;
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char *name;
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asymbol *sym;
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READ_LEB128 (index, p, end);
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READ_LEB128 (len, p, end);
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if (p + len < p || p + len > end)
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goto error_return;
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name = bfd_zalloc (abfd, len + 1);
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if (! name)
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goto error_return;
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memcpy (name, p, len);
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p += len;
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sym = &symbols[symcount];
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sym->the_bfd = abfd;
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sym->name = name;
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sym->value = index;
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sym->flags = BSF_GLOBAL | BSF_FUNCTION;
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sym->section = space_function_index;
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sym->udata.p = NULL;
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}
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if (symcount < tdata->symcount)
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goto error_return;
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tdata->symbols = symbols;
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abfd->symcount = symcount;
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return TRUE;
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error_return:
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while (symcount)
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bfd_release (abfd, (void *)symbols[--symcount].name);
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bfd_release (abfd, symbols);
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return FALSE;
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}
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/* Read a byte from ABFD and return it, or EOF for EOF or error.
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Set ERRORPTR on non-EOF error. */
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static int
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wasm_read_byte (bfd *abfd, bfd_boolean *errorptr)
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{
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bfd_byte byte;
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if (bfd_bread (&byte, (bfd_size_type) 1, abfd) != 1)
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{
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if (bfd_get_error () != bfd_error_file_truncated)
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*errorptr = TRUE;
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return EOF;
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}
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return byte;
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}
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/* Scan the wasm module ABFD, creating sections and symbols.
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Return TRUE on success. */
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static bfd_boolean
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wasm_scan (bfd *abfd)
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{
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bfd_boolean error = FALSE;
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/* Fake VMAs for now. Choose 0x80000000 as base to avoid clashes
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with actual data addresses. */
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bfd_vma vma = 0x80000000;
|
|
int section_code;
|
|
unsigned int bytes_read;
|
|
char *name = NULL;
|
|
asection *bfdsec;
|
|
|
|
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
|
|
goto error_return;
|
|
|
|
if (! wasm_read_header (abfd, &error))
|
|
goto error_return;
|
|
|
|
while ((section_code = wasm_read_byte (abfd, &error)) != EOF)
|
|
{
|
|
if (section_code != 0)
|
|
{
|
|
const char *sname = wasm_section_code_to_name (section_code);
|
|
|
|
if (! sname)
|
|
goto error_return;
|
|
|
|
name = strdup (sname);
|
|
bfdsec = bfd_make_section_anyway_with_flags (abfd, name, SEC_HAS_CONTENTS);
|
|
if (bfdsec == NULL)
|
|
goto error_return;
|
|
name = NULL;
|
|
|
|
bfdsec->vma = vma;
|
|
bfdsec->lma = vma;
|
|
bfdsec->size = wasm_read_leb128 (abfd, &error, &bytes_read, FALSE);
|
|
if (error)
|
|
goto error_return;
|
|
bfdsec->filepos = bfd_tell (abfd);
|
|
bfdsec->alignment_power = 0;
|
|
}
|
|
else
|
|
{
|
|
bfd_vma payload_len;
|
|
file_ptr section_start;
|
|
bfd_vma namelen;
|
|
char *prefix = WASM_SECTION_PREFIX;
|
|
char *p;
|
|
int ret;
|
|
|
|
payload_len = wasm_read_leb128 (abfd, &error, &bytes_read, FALSE);
|
|
if (error)
|
|
goto error_return;
|
|
section_start = bfd_tell (abfd);
|
|
namelen = wasm_read_leb128 (abfd, &error, &bytes_read, FALSE);
|
|
if (error || namelen > payload_len)
|
|
goto error_return;
|
|
name = bfd_zmalloc (namelen + strlen (prefix) + 1);
|
|
if (! name)
|
|
goto error_return;
|
|
p = name;
|
|
ret = sprintf (p, "%s", prefix);
|
|
if (ret < 0 || (bfd_vma) ret != strlen (prefix))
|
|
goto error_return;
|
|
p += ret;
|
|
if (bfd_bread (p, namelen, abfd) != namelen)
|
|
goto error_return;
|
|
|
|
bfdsec = bfd_make_section_anyway_with_flags (abfd, name, SEC_HAS_CONTENTS);
|
|
if (bfdsec == NULL)
|
|
goto error_return;
|
|
name = NULL;
|
|
|
|
bfdsec->vma = vma;
|
|
bfdsec->lma = vma;
|
|
bfdsec->filepos = bfd_tell (abfd);
|
|
bfdsec->size = section_start + payload_len - bfdsec->filepos;
|
|
bfdsec->alignment_power = 0;
|
|
}
|
|
|
|
if (bfdsec->size != 0)
|
|
{
|
|
bfdsec->contents = bfd_zalloc (abfd, bfdsec->size);
|
|
if (! bfdsec->contents)
|
|
goto error_return;
|
|
|
|
if (bfd_bread (bfdsec->contents, bfdsec->size, abfd) != bfdsec->size)
|
|
goto error_return;
|
|
}
|
|
|
|
vma += bfdsec->size;
|
|
}
|
|
|
|
/* Make sure we're at actual EOF. There's no indication in the
|
|
WebAssembly format of how long the file is supposed to be. */
|
|
if (error)
|
|
goto error_return;
|
|
|
|
return TRUE;
|
|
|
|
error_return:
|
|
if (name)
|
|
free (name);
|
|
|
|
for (bfdsec = abfd->sections; bfdsec; bfdsec = bfdsec->next)
|
|
free ((void *) bfdsec->name);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* Put a numbered section ASECT of ABFD into the table of numbered
|
|
sections pointed to by FSARG. */
|
|
|
|
static void
|
|
wasm_register_section (bfd *abfd ATTRIBUTE_UNUSED,
|
|
asection *asect,
|
|
void *fsarg)
|
|
{
|
|
sec_ptr *numbered_sections = fsarg;
|
|
int index = wasm_section_name_to_code (asect->name);
|
|
|
|
if (index == 0)
|
|
return;
|
|
|
|
numbered_sections[index] = asect;
|
|
}
|
|
|
|
struct compute_section_arg
|
|
{
|
|
bfd_vma pos;
|
|
bfd_boolean failed;
|
|
};
|
|
|
|
/* Compute the file position of ABFD's section ASECT. FSARG is a
|
|
pointer to the current file position.
|
|
|
|
We allow section names of the form .wasm.id to encode the numbered
|
|
section with ID id, if it exists; otherwise, a custom section with
|
|
ID "id" is produced. Arbitrary section names are for sections that
|
|
are assumed already to contain a section header; those are appended
|
|
to the WebAssembly module verbatim. */
|
|
|
|
static void
|
|
wasm_compute_custom_section_file_position (bfd *abfd,
|
|
sec_ptr asect,
|
|
void *fsarg)
|
|
{
|
|
struct compute_section_arg *fs = fsarg;
|
|
int index;
|
|
|
|
if (fs->failed)
|
|
return;
|
|
|
|
index = wasm_section_name_to_code (asect->name);
|
|
|
|
if (index != 0)
|
|
return;
|
|
|
|
if (CONST_STRNEQ (asect->name, WASM_SECTION_PREFIX))
|
|
{
|
|
const char *name = asect->name + strlen (WASM_SECTION_PREFIX);
|
|
bfd_size_type payload_len = asect->size;
|
|
bfd_size_type name_len = strlen (name);
|
|
bfd_size_type nl = name_len;
|
|
|
|
payload_len += name_len;
|
|
|
|
do
|
|
{
|
|
payload_len++;
|
|
nl >>= 7;
|
|
}
|
|
while (nl);
|
|
|
|
bfd_seek (abfd, fs->pos, SEEK_SET);
|
|
if (! wasm_write_uleb128 (abfd, 0)
|
|
|| ! wasm_write_uleb128 (abfd, payload_len)
|
|
|| ! wasm_write_uleb128 (abfd, name_len)
|
|
|| bfd_bwrite (name, name_len, abfd) != name_len)
|
|
goto error_return;
|
|
fs->pos = asect->filepos = bfd_tell (abfd);
|
|
}
|
|
else
|
|
{
|
|
asect->filepos = fs->pos;
|
|
}
|
|
|
|
|
|
fs->pos += asect->size;
|
|
return;
|
|
|
|
error_return:
|
|
fs->failed = TRUE;
|
|
}
|
|
|
|
/* Compute the file positions for the sections of ABFD. Currently,
|
|
this writes all numbered sections first, in order, then all custom
|
|
sections, in section order.
|
|
|
|
The spec says that the numbered sections must appear in order of
|
|
their ids, but custom sections can appear in any position and any
|
|
order, and more than once. FIXME: support that. */
|
|
|
|
static bfd_boolean
|
|
wasm_compute_section_file_positions (bfd *abfd)
|
|
{
|
|
bfd_byte magic[SIZEOF_WASM_MAGIC] = WASM_MAGIC;
|
|
bfd_byte vers[SIZEOF_WASM_VERSION] = WASM_VERSION;
|
|
sec_ptr numbered_sections[WASM_NUMBERED_SECTIONS];
|
|
struct compute_section_arg fs;
|
|
unsigned int i;
|
|
|
|
bfd_seek (abfd, (bfd_vma) 0, SEEK_SET);
|
|
|
|
if (bfd_bwrite (magic, sizeof (magic), abfd) != (sizeof magic)
|
|
|| bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers))
|
|
return FALSE;
|
|
|
|
for (i = 0; i < WASM_NUMBERED_SECTIONS; i++)
|
|
numbered_sections[i] = NULL;
|
|
|
|
bfd_map_over_sections (abfd, wasm_register_section, numbered_sections);
|
|
|
|
fs.pos = bfd_tell (abfd);
|
|
for (i = 0; i < WASM_NUMBERED_SECTIONS; i++)
|
|
{
|
|
sec_ptr sec = numbered_sections[i];
|
|
bfd_size_type size;
|
|
|
|
if (! sec)
|
|
continue;
|
|
size = sec->size;
|
|
if (bfd_seek (abfd, fs.pos, SEEK_SET) != 0)
|
|
return FALSE;
|
|
if (! wasm_write_uleb128 (abfd, i)
|
|
|| ! wasm_write_uleb128 (abfd, size))
|
|
return FALSE;
|
|
fs.pos = sec->filepos = bfd_tell (abfd);
|
|
fs.pos += size;
|
|
}
|
|
|
|
fs.failed = FALSE;
|
|
|
|
bfd_map_over_sections (abfd, wasm_compute_custom_section_file_position, &fs);
|
|
|
|
if (fs.failed)
|
|
return FALSE;
|
|
|
|
abfd->output_has_begun = TRUE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static bfd_boolean
|
|
wasm_set_section_contents (bfd *abfd,
|
|
sec_ptr section,
|
|
const void *location,
|
|
file_ptr offset,
|
|
bfd_size_type count)
|
|
{
|
|
if (count == 0)
|
|
return TRUE;
|
|
|
|
if (! abfd->output_has_begun
|
|
&& ! wasm_compute_section_file_positions (abfd))
|
|
return FALSE;
|
|
|
|
if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
|
|
|| bfd_bwrite (location, count, abfd) != count)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static bfd_boolean
|
|
wasm_write_object_contents (bfd* abfd)
|
|
{
|
|
bfd_byte magic[] = WASM_MAGIC;
|
|
bfd_byte vers[] = WASM_VERSION;
|
|
|
|
if (bfd_seek (abfd, 0, SEEK_SET) != 0)
|
|
return FALSE;
|
|
|
|
if (bfd_bwrite (magic, sizeof (magic), abfd) != sizeof (magic)
|
|
|| bfd_bwrite (vers, sizeof (vers), abfd) != sizeof (vers))
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static bfd_boolean
|
|
wasm_mkobject (bfd *abfd)
|
|
{
|
|
tdata_type *tdata = (tdata_type *) bfd_alloc (abfd, sizeof (tdata_type));
|
|
|
|
if (! tdata)
|
|
return FALSE;
|
|
|
|
tdata->symbols = NULL;
|
|
tdata->symcount = 0;
|
|
|
|
abfd->tdata.any = tdata;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static long
|
|
wasm_get_symtab_upper_bound (bfd *abfd)
|
|
{
|
|
tdata_type *tdata = abfd->tdata.any;
|
|
|
|
return (tdata->symcount + 1) * (sizeof (asymbol *));
|
|
}
|
|
|
|
static long
|
|
wasm_canonicalize_symtab (bfd *abfd, asymbol **alocation)
|
|
{
|
|
tdata_type *tdata = abfd->tdata.any;
|
|
size_t i;
|
|
|
|
for (i = 0; i < tdata->symcount; i++)
|
|
alocation[i] = &tdata->symbols[i];
|
|
alocation[i] = NULL;
|
|
|
|
return tdata->symcount;
|
|
}
|
|
|
|
static asymbol *
|
|
wasm_make_empty_symbol (bfd *abfd)
|
|
{
|
|
bfd_size_type amt = sizeof (asymbol);
|
|
asymbol *new_symbol = (asymbol *) bfd_zalloc (abfd, amt);
|
|
|
|
if (! new_symbol)
|
|
return NULL;
|
|
new_symbol->the_bfd = abfd;
|
|
return new_symbol;
|
|
}
|
|
|
|
static void
|
|
wasm_print_symbol (bfd *abfd,
|
|
void * filep,
|
|
asymbol *symbol,
|
|
bfd_print_symbol_type how)
|
|
{
|
|
FILE *file = (FILE *) filep;
|
|
|
|
switch (how)
|
|
{
|
|
case bfd_print_symbol_name:
|
|
fprintf (file, "%s", symbol->name);
|
|
break;
|
|
|
|
default:
|
|
bfd_print_symbol_vandf (abfd, filep, symbol);
|
|
fprintf (file, " %-5s %s", symbol->section->name, symbol->name);
|
|
}
|
|
}
|
|
|
|
static void
|
|
wasm_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
|
|
asymbol *symbol,
|
|
symbol_info *ret)
|
|
{
|
|
bfd_symbol_info (symbol, ret);
|
|
}
|
|
|
|
/* Check whether ABFD is a WebAssembly module; if so, scan it. */
|
|
|
|
static const bfd_target *
|
|
wasm_object_p (bfd *abfd)
|
|
{
|
|
bfd_boolean error;
|
|
|
|
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
|
|
return NULL;
|
|
|
|
if (! wasm_read_header (abfd, &error))
|
|
{
|
|
bfd_set_error (bfd_error_wrong_format);
|
|
return NULL;
|
|
}
|
|
|
|
if (! wasm_mkobject (abfd) || ! wasm_scan (abfd))
|
|
return NULL;
|
|
|
|
if (! bfd_default_set_arch_mach (abfd, bfd_arch_wasm32, 0))
|
|
return NULL;
|
|
|
|
if (wasm_scan_name_function_section (abfd, bfd_get_section_by_name (abfd, WASM_NAME_SECTION)))
|
|
abfd->flags |= HAS_SYMS;
|
|
|
|
return abfd->xvec;
|
|
}
|
|
|
|
/* BFD_JUMP_TABLE_WRITE */
|
|
#define wasm_set_arch_mach _bfd_generic_set_arch_mach
|
|
|
|
/* BFD_JUMP_TABLE_SYMBOLS */
|
|
#define wasm_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
|
|
#define wasm_bfd_is_local_label_name bfd_generic_is_local_label_name
|
|
#define wasm_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
|
|
#define wasm_get_lineno _bfd_nosymbols_get_lineno
|
|
#define wasm_find_nearest_line _bfd_nosymbols_find_nearest_line
|
|
#define wasm_find_line _bfd_nosymbols_find_line
|
|
#define wasm_find_inliner_info _bfd_nosymbols_find_inliner_info
|
|
#define wasm_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
|
|
#define wasm_read_minisymbols _bfd_generic_read_minisymbols
|
|
#define wasm_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
|
|
|
|
const bfd_target wasm_vec =
|
|
{
|
|
"wasm", /* Name. */
|
|
bfd_target_unknown_flavour,
|
|
BFD_ENDIAN_LITTLE,
|
|
BFD_ENDIAN_LITTLE,
|
|
(HAS_SYMS | WP_TEXT), /* Object flags. */
|
|
(SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS), /* Section flags. */
|
|
0, /* Leading underscore. */
|
|
' ', /* AR_pad_char. */
|
|
255, /* AR_max_namelen. */
|
|
0, /* Match priority. */
|
|
/* Routines to byte-swap various sized integers from the data sections. */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16,
|
|
|
|
/* Routines to byte-swap various sized integers from the file headers. */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16,
|
|
|
|
{
|
|
_bfd_dummy_target,
|
|
wasm_object_p, /* bfd_check_format. */
|
|
_bfd_dummy_target,
|
|
_bfd_dummy_target,
|
|
},
|
|
{
|
|
bfd_false,
|
|
wasm_mkobject,
|
|
_bfd_generic_mkarchive,
|
|
bfd_false,
|
|
},
|
|
{ /* bfd_write_contents. */
|
|
bfd_false,
|
|
wasm_write_object_contents,
|
|
_bfd_write_archive_contents,
|
|
bfd_false,
|
|
},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (_bfd_generic),
|
|
BFD_JUMP_TABLE_COPY (_bfd_generic),
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
|
|
BFD_JUMP_TABLE_SYMBOLS (wasm),
|
|
BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
|
|
BFD_JUMP_TABLE_WRITE (wasm),
|
|
BFD_JUMP_TABLE_LINK (_bfd_nolink),
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
NULL,
|
|
|
|
NULL,
|
|
};
|