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- /* libunwind - a platform-independent unwind library
- This file is part of libunwind.
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
- The above copyright notice and this permission notice shall be
- included in all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- #include "_UCD_lib.h"
- #include "_UCD_internal.h"
- int
- _UCD_access_mem(unw_addr_space_t as, unw_word_t addr, unw_word_t *val,
- int write, void *arg)
- {
- if (write)
- {
- Debug(0, "%s: write is not supported\n", __func__);
- return -UNW_EINVAL;
- }
- struct UCD_info *ui = arg;
- unw_word_t addr_last = addr + sizeof(*val)-1;
- coredump_phdr_t *phdr;
- unsigned i;
- for (i = 0; i < ui->phdrs_count; i++)
- {
- phdr = &ui->phdrs[i];
- if (phdr->p_vaddr <= addr && addr_last < phdr->p_vaddr + phdr->p_memsz)
- {
- goto found;
- }
- }
- Debug(1, "%s: addr 0x%llx is unmapped\n",
- __func__, (unsigned long long)addr
- );
- return -UNW_EINVAL;
- found: ;
- const char *filename;
- off_t fileofs;
- int fd;
- if (addr_last >= phdr->p_vaddr + phdr->p_filesz)
- {
- /* This part of mapped address space is not present in coredump file */
- /* Do we have it in the backup file? */
- if (phdr->backing_fd < 0)
- {
- Debug(1, "%s: access to not-present data in phdr[%d]: addr:0x%llx\n",
- __func__, i, (unsigned long long)addr
- );
- return -UNW_EINVAL;
- }
- filename = phdr->backing_filename;
- fileofs = addr - phdr->p_vaddr;
- fd = phdr->backing_fd;
- goto read;
- }
- filename = ui->coredump_filename;
- fileofs = phdr->p_offset + (addr - phdr->p_vaddr);
- fd = ui->coredump_fd;
- read:
- if (lseek(fd, fileofs, SEEK_SET) != fileofs)
- goto read_error;
- if (read(fd, val, sizeof(*val)) != sizeof(*val))
- goto read_error;
- Debug(1, "%s: 0x%llx <- [addr:0x%llx fileofs:0x%llx]\n",
- __func__,
- (unsigned long long)(*val),
- (unsigned long long)addr,
- (unsigned long long)fileofs
- );
- return 0;
- read_error:
- Debug(1, "%s: access out of file: addr:0x%llx fileofs:%llx file:'%s'\n",
- __func__,
- (unsigned long long)addr,
- (unsigned long long)fileofs,
- filename
- );
- return -UNW_EINVAL;
- }
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