mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-28 22:18:29 +00:00
1422e96b4e
There's a new program named ape/ape-m1.c which will be used to build an embeddable binary that can load ape and elf executables. The support is mostly working so far, but still chasing down ABI issues.
217 lines
7.4 KiB
C
217 lines
7.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/dce.h"
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#include "libc/elf/elf.h"
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#include "libc/elf/scalar.h"
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#include "libc/elf/struct/rela.h"
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#include "libc/elf/struct/shdr.h"
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#include "libc/elf/struct/sym.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/log/check.h"
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#include "libc/log/log.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/msync.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "third_party/getopt/getopt.h"
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/**
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* @fileoverview GCC Codegen Fixer-Upper.
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*/
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#define GETOPTS "h"
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#define USAGE \
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"\
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Usage: fixupobj.com [-h] ARGS...\n\
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-?\n\
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-h show help\n\
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"
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#define COSMO_TLS_REG 28
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#define MRS_TPIDR_EL0 0xd53bd040u
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#define MOV_REG(DST, SRC) (0xaa0003e0u | (SRC) << 16 | (DST))
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void Write(const char *s, ...) {
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va_list va;
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va_start(va, s);
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do {
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write(2, s, strlen(s));
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} while ((s = va_arg(va, const char *)));
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va_end(va);
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}
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wontreturn void SysExit(int rc, const char *call, const char *thing) {
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int err;
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char ibuf[12];
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const char *estr;
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err = errno;
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FormatInt32(ibuf, err);
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estr = _strerdoc(err);
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if (!estr) estr = "EUNKNOWN";
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Write(thing, ": ", call, "() failed: ", estr, " (", ibuf, ")\n", NULL);
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exit(rc);
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}
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static void GetOpts(int argc, char *argv[]) {
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int opt;
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while ((opt = getopt(argc, argv, GETOPTS)) != -1) {
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switch (opt) {
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case 'h':
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case '?':
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write(1, USAGE, sizeof(USAGE) - 1);
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exit(0);
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default:
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write(2, USAGE, sizeof(USAGE) - 1);
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exit(64);
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}
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}
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}
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// Modify ARM64 code to use x28 for TLS rather than tpidr_el0.
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void RewriteTlsCode(Elf64_Ehdr *elf, size_t elfsize) {
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int i, dest;
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Elf64_Shdr *shdr;
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uint32_t *p, *pe;
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for (i = 0; i < elf->e_shnum; ++i) {
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shdr = GetElfSectionHeaderAddress(elf, elfsize, i);
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if (shdr->sh_type == SHT_PROGBITS && //
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(shdr->sh_flags & SHF_ALLOC) && //
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(shdr->sh_flags & SHF_EXECINSTR) && //
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(p = GetElfSectionAddress(elf, elfsize, shdr))) {
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for (pe = p + shdr->sh_size / 4; p <= pe; ++p) {
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if ((*p & -32) == MRS_TPIDR_EL0) {
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*p = MOV_REG(*p & 31, COSMO_TLS_REG);
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}
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}
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}
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}
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}
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void OptimizeRelocations(Elf64_Ehdr *elf, size_t elfsize) {
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char *strs;
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Elf64_Half i;
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Elf64_Sym *syms;
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Elf64_Rela *rela;
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Elf64_Xword symcount;
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unsigned char *code, *p;
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Elf64_Shdr *shdr, *shdrcode;
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CHECK_NOTNULL((strs = GetElfStringTable(elf, elfsize)));
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CHECK_NOTNULL((syms = GetElfSymbolTable(elf, elfsize, &symcount)));
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for (i = 0; i < elf->e_shnum; ++i) {
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shdr = GetElfSectionHeaderAddress(elf, elfsize, i);
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if (shdr->sh_type == SHT_RELA) {
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CHECK_EQ(sizeof(struct Elf64_Rela), shdr->sh_entsize);
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CHECK_NOTNULL(
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(shdrcode = GetElfSectionHeaderAddress(elf, elfsize, shdr->sh_info)));
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if (!(shdrcode->sh_flags & SHF_EXECINSTR)) continue;
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CHECK_NOTNULL((code = GetElfSectionAddress(elf, elfsize, shdrcode)));
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for (rela = GetElfSectionAddress(elf, elfsize, shdr);
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((uintptr_t)rela + shdr->sh_entsize <=
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MIN((uintptr_t)elf + elfsize,
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(uintptr_t)elf + shdr->sh_offset + shdr->sh_size));
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++rela) {
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/*
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* GCC isn't capable of -mnop-mcount when using -fpie.
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* Let's fix that. It saves ~14 cycles per function call.
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* Then libc/runtime/ftrace.greg.c morphs it back at runtime.
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*/
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if (ELF64_R_TYPE(rela->r_info) == R_X86_64_GOTPCRELX &&
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strcmp(GetElfString(elf, elfsize, strs,
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syms[ELF64_R_SYM(rela->r_info)].st_name),
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"mcount") == 0) {
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rela->r_info = R_X86_64_NONE;
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p = code + rela->r_offset - 2;
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p[0] = 0x66; /* nopw 0x00(%rax,%rax,1) */
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p[1] = 0x0f;
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p[2] = 0x1f;
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p[3] = 0x44;
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p[4] = 0x00;
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p[5] = 0x00;
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}
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/*
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* Let's just try to nop mcount calls in general due to the above.
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*/
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if ((ELF64_R_TYPE(rela->r_info) == R_X86_64_PC32 ||
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ELF64_R_TYPE(rela->r_info) == R_X86_64_PLT32) &&
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strcmp(GetElfString(elf, elfsize, strs,
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syms[ELF64_R_SYM(rela->r_info)].st_name),
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"mcount") == 0) {
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rela->r_info = R_X86_64_NONE;
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p = code + rela->r_offset - 1;
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p[0] = 0x0f; /* nopl 0x00(%rax,%rax,1) */
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p[1] = 0x1f;
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p[2] = 0x44;
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p[3] = 0x00;
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p[4] = 0x00;
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}
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}
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}
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}
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}
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void RewriteObject(const char *path) {
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int fd;
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struct stat st;
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Elf64_Ehdr *elf;
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if ((fd = open(path, O_RDWR)) == -1) {
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SysExit(__COUNTER__ + 1, "open", path);
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}
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if (fstat(fd, &st) == -1) {
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SysExit(__COUNTER__ + 1, "fstat", path);
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}
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if (st.st_size >= 64) {
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if ((elf = mmap(0, st.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
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0)) == MAP_FAILED) {
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SysExit(__COUNTER__ + 1, "mmap", path);
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}
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if (elf->e_machine == EM_NEXGEN32E) {
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OptimizeRelocations(elf, st.st_size);
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}
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if (elf->e_machine == EM_AARCH64) {
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RewriteTlsCode(elf, st.st_size);
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}
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if (msync(elf, st.st_size, MS_ASYNC | MS_INVALIDATE)) {
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SysExit(__COUNTER__ + 1, "msync", path);
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}
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if (munmap(elf, st.st_size)) {
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SysExit(__COUNTER__ + 1, "munmap", path);
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}
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}
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if (close(fd)) {
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SysExit(__COUNTER__ + 1, "close", path);
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}
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}
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int main(int argc, char *argv[]) {
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int i, opt;
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if (IsModeDbg()) ShowCrashReports();
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GetOpts(argc, argv);
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for (i = optind; i < argc; ++i) {
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RewriteObject(argv[i]);
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}
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}
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