mirror of
https://github.com/tobast/libunwind-eh_elf.git
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99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/* libunwind - a platform-independent unwind library
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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 <elf.h>
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#include "_UCD_lib.h"
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#include "_UCD_internal.h"
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static coredump_phdr_t *
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CD_elf_map_image(struct UCD_info *ui, coredump_phdr_t *phdr)
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{
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struct elf_image *ei = &ui->edi.ei;
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if (phdr->backing_fd < 0)
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{
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/* Note: coredump file contains only phdr->p_filesz bytes.
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* We want to map bigger area (phdr->p_memsz bytes) to make sure
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* these pages are allocated, but non-accessible.
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*/
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/* addr, length, prot, flags, fd, fd_offset */
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ei->image = mmap(NULL, phdr->p_memsz, PROT_READ, MAP_PRIVATE, ui->coredump_fd, phdr->p_offset);
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if (ei->image == MAP_FAILED)
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{
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ei->image = NULL;
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return NULL;
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}
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ei->size = phdr->p_filesz;
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size_t remainder_len = phdr->p_memsz - phdr->p_filesz;
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if (remainder_len > 0)
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{
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void *remainder_base = (char*) ei->image + phdr->p_filesz;
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munmap(remainder_base, remainder_len);
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}
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} else {
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/* We have a backing file for this segment.
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* This file is always longer than phdr->p_memsz,
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* and if phdr->p_filesz !=0, first phdr->p_filesz bytes in coredump
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* are the same as first bytes in the file. (Thus no need to map coredump)
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* We map the entire file:
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* unwinding may need data which is past phdr->p_memsz bytes.
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*/
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/* addr, length, prot, flags, fd, fd_offset */
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ei->image = mmap(NULL, phdr->backing_filesize, PROT_READ, MAP_PRIVATE, phdr->backing_fd, 0);
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if (ei->image == MAP_FAILED)
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{
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ei->image = NULL;
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return NULL;
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}
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ei->size = phdr->backing_filesize;
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}
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/* Check ELF header for sanity */
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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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ei->image = NULL;
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ei->size = 0;
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return NULL;
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}
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return phdr;
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}
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HIDDEN coredump_phdr_t *
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_UCD_get_elf_image(struct UCD_info *ui, unw_word_t ip)
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{
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unsigned i;
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for (i = 0; i < ui->phdrs_count; i++)
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{
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coredump_phdr_t *phdr = &ui->phdrs[i];
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if (phdr->p_vaddr <= ip && ip < phdr->p_vaddr + phdr->p_memsz)
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{
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phdr = CD_elf_map_image(ui, phdr);
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return phdr;
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}
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}
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return NULL;
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}
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