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https://github.com/tobast/libunwind-eh_elf.git
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54a970079d
Centralize gnu_debuglink logic in elfxx. Remove previous duplicated logic from Gfind_proc_info and os-linux. Logic is roughly the same as previous load_debug_frame, but uses VLAs instead of malloc.
101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2003, 2005 Hewlett-Packard Co
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Copyright (C) 2007 David Mosberger-Tang
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Contributed by David Mosberger-Tang <dmosberger@gmail.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "libunwind_i.h"
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#if ELF_CLASS == ELFCLASS32
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# define ELF_W(x) ELF32_##x
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# define Elf_W(x) Elf32_##x
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# define elf_w(x) _Uelf32_##x
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#else
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# define ELF_W(x) ELF64_##x
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# define Elf_W(x) Elf64_##x
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# define elf_w(x) _Uelf64_##x
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#endif
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extern int elf_w (get_proc_name) (unw_addr_space_t as,
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pid_t pid, unw_word_t ip,
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char *buf, size_t len,
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unw_word_t *offp);
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extern int elf_w (get_proc_name_in_image) (unw_addr_space_t as,
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struct elf_image *ei,
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unsigned long segbase,
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unsigned long mapoff,
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unw_word_t ip,
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char *buf, size_t buf_len, unw_word_t *offp);
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extern Elf_W (Shdr)* elf_w (find_section) (struct elf_image *ei, const char* secname);
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extern int elf_w (load_debuglink) (const char* file, struct elf_image *ei, int is_local);
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static inline int
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elf_w (valid_object) (struct elf_image *ei)
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{
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if (ei->size <= EI_VERSION)
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return 0;
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return (memcmp (ei->image, ELFMAG, SELFMAG) == 0
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&& ((uint8_t *) ei->image)[EI_CLASS] == ELF_CLASS
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&& ((uint8_t *) ei->image)[EI_VERSION] != EV_NONE
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&& ((uint8_t *) ei->image)[EI_VERSION] <= EV_CURRENT);
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}
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static inline int
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elf_map_image (struct elf_image *ei, const char *path)
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{
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struct stat stat;
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int fd;
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fd = open (path, O_RDONLY);
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if (fd < 0)
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return -1;
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if (fstat (fd, &stat) < 0)
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{
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close (fd);
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return -1;
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}
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ei->size = stat.st_size;
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ei->image = mmap (NULL, ei->size, PROT_READ, MAP_PRIVATE, fd, 0);
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close (fd);
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if (ei->image == MAP_FAILED)
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return -1;
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if (!elf_w (valid_object) (ei))
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{
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munmap(ei->image, ei->size);
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return -1;
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}
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return 0;
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}
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