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https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-23 03:53:43 +01:00
Prevent the use of struct dl_phdr_info outside of dl_iterate_phdr
Since the dl_iterate_phdr is required for local unwinding only the use of struct dl_phdr_info can be eliminated in case libunwind gets compiled for remote unwinding. This enhances libunwinds portability to targets that don't provide any dl_iterate_phdr functionality. Signed-off-by: Ken Werner <ken.werner@linaro.org>
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parent
0fed502a81
commit
059676cb00
3 changed files with 58 additions and 69 deletions
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@ -387,7 +387,9 @@ extern int dwarf_find_proc_info (unw_addr_space_t as, unw_word_t ip,
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int need_unwind_info, void *arg);
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#endif /* !UNW_REMOTE_ONLY */
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extern int dwarf_find_debug_frame (int found, unw_dyn_info_t *di_debug,
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struct dl_phdr_info *info, unw_word_t ip);
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unw_word_t ip, unw_word_t segbase,
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const char* obj_name, unw_word_t start,
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unw_word_t end);
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extern int dwarf_search_unwind_table (unw_addr_space_t as,
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unw_word_t ip,
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unw_dyn_info_t *di,
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@ -26,7 +26,9 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/* Locate an FDE via the ELF data-structures defined by LSB v1.3
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(http://www.linuxbase.org/spec/). */
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#ifndef UNW_REMOTE_ONLY
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#include <link.h>
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#endif /* !UNW_REMOTE_ONLY */
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#include <stddef.h>
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#include <stdio.h>
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#include <limits.h>
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@ -269,17 +271,15 @@ find_binary_for_address (unw_word_t ip, char *name, size_t name_size)
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pointer to debug frame descriptor, or zero if not found. */
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static struct unw_debug_frame_list *
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locate_debug_info (unw_addr_space_t as, struct dl_phdr_info *info,
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unw_word_t addr, const char *dlname)
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locate_debug_info (unw_addr_space_t as, unw_word_t addr, const char *dlname,
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unw_word_t start, unw_word_t end)
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{
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struct unw_debug_frame_list *w, *fdesc = 0;
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char path[PATH_MAX];
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char *name = path;
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int err;
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uint64_t start = 0, end = 0;
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char *buf;
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size_t bufsize;
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unsigned int i;
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/* First, see if we loaded this frame already. */
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@ -306,29 +306,6 @@ locate_debug_info (unw_addr_space_t as, struct dl_phdr_info *info,
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else
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name = (char*) dlname;
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/* Find the start/end of the described region by parsing the
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dl_phdr_info structure. */
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start = info->dlpi_addr + info->dlpi_phdr[0].p_vaddr;
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end = start;
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for (i = 0; i < info->dlpi_phnum; i++)
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{
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Elf_W (Addr) hdrbase = info->dlpi_addr + info->dlpi_phdr[i].p_vaddr;
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Elf_W (Addr) hdrlimit = hdrbase + info->dlpi_phdr[i].p_memsz;
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if (info->dlpi_phdr[i].p_type != PT_LOAD)
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continue;
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if (hdrbase < start)
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start = hdrbase;
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if (hdrlimit > end)
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end = hdrlimit;
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}
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Debug (4, "calculated bounds of %lx-%lx for '%s'\n", (long)start, (long)end,
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name);
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err = load_debug_frame (name, &buf, &bufsize, as == unw_local_addr_space);
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if (!err)
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@ -409,19 +386,19 @@ debug_frame_tab_compare (const void *a, const void *b)
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}
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PROTECTED int
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dwarf_find_debug_frame (int found, unw_dyn_info_t *di_debug,
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struct dl_phdr_info *info, unw_word_t ip)
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dwarf_find_debug_frame (int found, unw_dyn_info_t *di_debug, unw_word_t ip,
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unw_word_t segbase, const char* obj_name,
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unw_word_t start, unw_word_t end)
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{
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unw_dyn_info_t *di;
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struct unw_debug_frame_list *fdesc = 0;
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unw_accessors_t *a;
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unw_word_t addr;
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Debug (15, "Trying to find .debug_frame info->dlpi_name=%s\n",
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info->dlpi_name);
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Debug (15, "Trying to find .debug_frame for %s\n", obj_name);
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di = di_debug;
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fdesc = locate_debug_info (unw_local_addr_space, info, ip, info->dlpi_name);
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fdesc = locate_debug_info (unw_local_addr_space, ip, obj_name, start, end);
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if (!fdesc)
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{
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@ -539,10 +516,10 @@ dwarf_find_debug_frame (int found, unw_dyn_info_t *di_debug,
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di->format = UNW_INFO_FORMAT_TABLE;
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di->start_ip = fdesc->start;
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di->end_ip = fdesc->end;
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di->u.ti.name_ptr = (unw_word_t) (uintptr_t) info->dlpi_name;
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di->u.ti.name_ptr = (unw_word_t) (uintptr_t) obj_name;
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di->u.ti.table_data = (unw_word_t *) fdesc;
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di->u.ti.table_len = sizeof (*fdesc) / sizeof (unw_word_t);
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di->u.ti.segbase = (unw_word_t) (uintptr_t) info->dlpi_addr;
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di->u.ti.segbase = segbase;
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found = 1;
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Debug (15, "found debug_frame table `%s': segbase=0x%lx, len=%lu, "
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@ -567,7 +544,7 @@ dwarf_callback (struct dl_phdr_info *info, size_t size, void *ptr)
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struct dwarf_callback_data *cb_data = ptr;
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unw_dyn_info_t *di = &cb_data->di;
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const Elf_W(Phdr) *phdr, *p_eh_hdr, *p_dynamic, *p_text;
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unw_word_t addr, eh_frame_start, eh_frame_end, fde_count, ip;
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unw_word_t addr, eh_frame_start, eh_frame_end, fde_count, ip, start, end;
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Elf_W(Addr) load_base, segbase = 0, max_load_addr = 0;
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int ret, need_unwind_info = cb_data->need_unwind_info;
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unw_proc_info_t *pi = cb_data->pi;
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@ -733,9 +710,29 @@ dwarf_callback (struct dl_phdr_info *info, size_t size, void *ptr)
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}
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#ifdef CONFIG_DEBUG_FRAME
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/* Find the start/end of the described region by parsing the phdr_info
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structure. */
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start = (unw_word_t) -1;
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end = 0;
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for (n = 0; n < info->dlpi_phnum; n++)
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{
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found = dwarf_find_debug_frame (found, &cb_data->di_debug, info, ip);
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if (info->dlpi_phdr[n].p_type == PT_LOAD)
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{
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unw_word_t seg_start = info->dlpi_addr + info->dlpi_phdr[n].p_vaddr;
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unw_word_t seg_end = seg_start + info->dlpi_phdr[n].p_memsz;
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if (seg_start < start)
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start = seg_start;
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if (seg_end > end)
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end = seg_end;
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}
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}
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found = dwarf_find_debug_frame (found, &cb_data->di_debug, ip,
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info->dlpi_addr, info->dlpi_name, start,
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end);
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#endif /* CONFIG_DEBUG_FRAME */
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return found;
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@ -172,6 +172,8 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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Elf_W(Phdr) *phdr, *ptxt = NULL, *peh_hdr = NULL, *pdyn = NULL;
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unw_word_t addr, eh_frame_start, fde_count, load_base;
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unw_word_t max_load_addr = 0;
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unw_word_t start_ip = (unw_word_t) -1;
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unw_word_t end_ip = 0;
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struct dwarf_eh_frame_hdr *hdr;
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unw_proc_info_t pi;
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unw_accessors_t *a;
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@ -194,6 +196,12 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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switch (phdr[i].p_type)
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{
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case PT_LOAD:
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if (phdr[i].p_vaddr < start_ip)
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start_ip = phdr[i].p_vaddr;
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if (phdr[i].p_vaddr + phdr[i].p_memsz > end_ip)
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end_ip = phdr[i].p_vaddr + phdr[i].p_memsz;
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if (phdr[i].p_offset == mapoff)
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ptxt = phdr + i;
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if ((uintptr_t) ui->ei.image + phdr->p_filesz > max_load_addr)
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@ -222,6 +230,10 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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if (!ptxt)
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return 0;
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load_base = segbase - ptxt->p_vaddr;
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start_ip += load_base;
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end_ip += load_base;
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if (peh_hdr)
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{
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if (pdyn)
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@ -305,10 +317,8 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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#endif
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}
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load_base = segbase - ptxt->p_vaddr;
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ui->di_cache.start_ip = segbase;
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ui->di_cache.end_ip = ui->di_cache.start_ip + ptxt->p_memsz;
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ui->di_cache.start_ip = start_ip;
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ui->di_cache.end_ip = end_ip;
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ui->di_cache.format = UNW_INFO_FORMAT_REMOTE_TABLE;
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ui->di_cache.u.rti.name_ptr = 0;
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/* two 32-bit values (ip_offset/fde_offset) per table-entry: */
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@ -329,39 +339,19 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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if (parm_exidx)
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{
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ui->di_arm.format = UNW_INFO_FORMAT_ARM_EXIDX;
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ui->di_arm.start_ip = segbase;
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ui->di_arm.end_ip = ui->di_arm.start_ip + ptxt->p_memsz;
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ui->di_arm.start_ip = start_ip;
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ui->di_arm.end_ip = end_ip;
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ui->di_arm.u.rti.name_ptr = (unw_word_t) path;
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ui->di_arm.u.rti.table_data = parm_exidx->p_vaddr + segbase -
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ptxt->p_vaddr;
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ui->di_arm.u.rti.table_data = load_base + parm_exidx->p_vaddr;
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ui->di_arm.u.rti.table_len = parm_exidx->p_memsz;
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found = 1;
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}
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#endif
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#ifdef CONFIG_DEBUG_FRAME
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{
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/* Try .debug_frame. */
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struct dl_phdr_info info;
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info.dlpi_name = path;
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info.dlpi_phdr = phdr;
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info.dlpi_phnum = ehdr->e_phnum;
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/* Fixup segbase to match correct base address. */
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for (i = 0; i < info.dlpi_phnum; i++)
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{
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if (info.dlpi_phdr[i].p_type == PT_LOAD &&
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info.dlpi_phdr[i].p_offset == 0)
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{
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segbase -= info.dlpi_phdr[i].p_vaddr;
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break;
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}
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}
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info.dlpi_addr = segbase;
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found = dwarf_find_debug_frame (found, &ui->di_debug, &info, ip);
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}
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found = dwarf_find_debug_frame (found, &ui->di_debug, ip, segbase, path,
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start_ip, end_ip);
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#endif
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return found;
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