forked from Imagelibrary/binutils-gdb
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* This test program is part of GDB, the GNU debugger.
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Copyright 2020-2024 Free Software Foundation, Inc.
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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, see <http://www.gnu.org/licenses/>. */
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/* Simulates loading of JIT code by memory mapping a compiled
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shared library binary and doing minimal post-processing. */
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#include <elf.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <link.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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/* ElfW is coming from linux. On other platforms it does not exist.
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Let us define it here. */
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#ifndef ElfW
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#if (defined(_LP64) || defined(__LP64__))
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#define WORDSIZE 64
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#else
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#define WORDSIZE 32
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#endif /* _LP64 || __LP64__ */
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#define ElfW(type) _ElfW (Elf, WORDSIZE, type)
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#define _ElfW(e, w, t) _ElfW_1 (e, w, _##t)
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#define _ElfW_1(e, w, t) e##w##t
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#endif /* !ElfW */
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/* Find symbol with the name `sym_name`. */
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static void *
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load_symbol (void *addr, const char *sym_name)
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{
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const ElfW (Ehdr) *const ehdr = (ElfW (Ehdr) *) addr;
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ElfW (Shdr) *const shdr = (ElfW (Shdr) *) ((char *) addr + ehdr->e_shoff);
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ElfW (Addr) sym_old_addr = 0;
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ElfW (Addr) sym_new_addr = 0;
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/* Find `func_name` in symbol_table and return its address. */
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int i;
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for (i = 0; i < ehdr->e_shnum; ++i)
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{
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if (shdr[i].sh_type == SHT_SYMTAB)
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{
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ElfW (Sym) *symtab = (ElfW (Sym) *) (addr + shdr[i].sh_offset);
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ElfW (Sym) *symtab_end
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= (ElfW (Sym) *) (addr + shdr[i].sh_offset + shdr[i].sh_size);
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char *const strtab
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= (char *) (addr + shdr[shdr[i].sh_link].sh_offset);
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ElfW (Sym) *p;
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for (p = symtab; p < symtab_end; ++p)
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{
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const char *s = strtab + p->st_name;
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if (strcmp (s, sym_name) == 0)
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return (void *) p->st_value;
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}
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}
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}
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fprintf (stderr, "symbol '%s' not found\n", sym_name);
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exit (1);
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return 0;
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}
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/* Open an elf binary file and memory map it with execution flag enabled. */
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static void *
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load_elf (const char *libname, size_t *size, void *load_addr)
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{
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int fd;
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struct stat st;
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if ((fd = open (libname, O_RDONLY)) == -1)
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{
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fprintf (stderr, "open (\"%s\", O_RDONLY): %s\n", libname,
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strerror (errno));
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exit (1);
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}
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if (fstat (fd, &st) != 0)
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{
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fprintf (stderr, "fstat (\"%d\"): %s\n", fd, strerror (errno));
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exit (1);
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}
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void *addr = mmap (load_addr, st.st_size,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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load_addr != NULL ? MAP_PRIVATE | MAP_FIXED : MAP_PRIVATE,
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fd, 0);
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close (fd);
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if (addr == MAP_FAILED)
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{
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fprintf (stderr, "mmap: %s\n", strerror (errno));
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exit (1);
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}
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if (size != NULL)
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*size = st.st_size;
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return addr;
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}
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