mirror of
https://github.com/FEX-Emu/libunwind.git
synced 2024-12-03 11:50:41 +00:00
Move some dwarf functionality from ptrace to dwarf
Move ptrace-independent code from src/ptrace/_UPT_find_proc_info.c
to src/dwarf/{G,L}find_unwind_table.c. Name this moved function
dwarf_find_unwind_table().
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Arun Sharma
parent
25ee9f8172
commit
6525714c27
@ -37,6 +37,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <libunwind.h>
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struct dwarf_cursor; /* forward-declaration */
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struct elf_dyn_info;
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#include "dwarf-config.h"
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#ifndef UNW_REMOTE_ONLY
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@ -368,6 +369,7 @@ struct dwarf_callback_data
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#define dwarf_find_proc_info UNW_OBJ (dwarf_find_proc_info)
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#define dwarf_find_debug_frame UNW_OBJ (dwarf_find_debug_frame)
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#define dwarf_search_unwind_table UNW_OBJ (dwarf_search_unwind_table)
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#define dwarf_find_unwind_table UNW_OBJ (dwarf_find_unwind_table)
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#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
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#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
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#define dwarf_eval_expr UNW_OBJ (dwarf_eval_expr)
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@ -395,6 +397,9 @@ extern int dwarf_search_unwind_table (unw_addr_space_t as,
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unw_dyn_info_t *di,
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unw_proc_info_t *pi,
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int need_unwind_info, void *arg);
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extern int dwarf_find_unwind_table (struct elf_dyn_info *edi, unw_addr_space_t as,
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char *path, unw_word_t segbase, unw_word_t mapoff,
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unw_word_t ip);
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extern void dwarf_put_unwind_info (unw_addr_space_t as,
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unw_proc_info_t *pi, void *arg);
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extern int dwarf_eval_expr (struct dwarf_cursor *c, unw_word_t *addr,
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@ -109,12 +109,14 @@ libunwind_dwarf_common_la_SOURCES = dwarf/global.c
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libunwind_dwarf_local_la_SOURCES = \
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dwarf/Lexpr.c dwarf/Lfde.c dwarf/Lparser.c dwarf/Lpe.c dwarf/Lstep.c \
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dwarf/Lfind_proc_info-lsb.c
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dwarf/Lfind_proc_info-lsb.c \
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dwarf/Lfind_unwind_table.c
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libunwind_dwarf_local_la_LIBADD = libunwind-dwarf-common.la
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libunwind_dwarf_generic_la_SOURCES = \
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dwarf/Gexpr.c dwarf/Gfde.c dwarf/Gparser.c dwarf/Gpe.c dwarf/Gstep.c \
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dwarf/Gfind_proc_info-lsb.c
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dwarf/Gfind_proc_info-lsb.c \
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dwarf/Gfind_unwind_table.c
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libunwind_dwarf_generic_la_LIBADD = libunwind-dwarf-common.la
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if USE_DWARF
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348
src/dwarf/Gfind_unwind_table.c
Normal file
348
src/dwarf/Gfind_unwind_table.c
Normal file
@ -0,0 +1,348 @@
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2003-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.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 <elf.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "libunwind_i.h"
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#if UNW_TARGET_IA64
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#include "elf64.h"
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static unw_word_t
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find_gp (struct elf_dyn_info *edi, Elf64_Phdr *pdyn, Elf64_Addr load_base)
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{
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Elf64_Off soff, str_soff;
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Elf64_Ehdr *ehdr = edi->ei.image;
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Elf64_Shdr *shdr;
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Elf64_Shdr *str_shdr;
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Elf64_Addr gp = 0;
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char *strtab;
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int i;
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if (pdyn)
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{
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/* If we have a PT_DYNAMIC program header, fetch the gp-value
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from the DT_PLTGOT entry. */
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Elf64_Dyn *dyn = (Elf64_Dyn *) (pdyn->p_offset + (char *) edi->ei.image);
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for (; dyn->d_tag != DT_NULL; ++dyn)
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if (dyn->d_tag == DT_PLTGOT)
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{
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gp = (Elf64_Addr) dyn->d_un.d_ptr + load_base;
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goto done;
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}
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}
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/* Without a PT_DYAMIC header, lets try to look for a non-empty .opd
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section. If there is such a section, we know it's full of
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function descriptors, and we can simply pick up the gp from the
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second word of the first entry in this table. */
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soff = ehdr->e_shoff;
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str_soff = soff + (ehdr->e_shstrndx * ehdr->e_shentsize);
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if (soff + ehdr->e_shnum * ehdr->e_shentsize > edi->ei.size)
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{
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Debug (1, "section table outside of image? (%lu > %lu)",
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soff + ehdr->e_shnum * ehdr->e_shentsize,
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edi->ei.size);
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goto done;
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}
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shdr = (Elf64_Shdr *) ((char *) edi->ei.image + soff);
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str_shdr = (Elf64_Shdr *) ((char *) edi->ei.image + str_soff);
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strtab = (char *) edi->ei.image + str_shdr->sh_offset;
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for (i = 0; i < ehdr->e_shnum; ++i)
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{
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if (strcmp (strtab + shdr->sh_name, ".opd") == 0
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&& shdr->sh_size >= 16)
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{
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gp = ((Elf64_Addr *) ((char *) edi->ei.image + shdr->sh_offset))[1];
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goto done;
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}
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shdr = (Elf64_Shdr *) (((char *) shdr) + ehdr->e_shentsize);
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}
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done:
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Debug (16, "image at %p, gp = %lx\n", edi->ei.image, gp);
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return gp;
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}
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int
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dwarf_find_unwind_table (struct elf_dyn_info *edi, unw_addr_space_t as,
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char *path, unw_word_t segbase, unw_word_t mapoff,
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unw_word_t ip)
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{
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Elf64_Phdr *phdr, *ptxt = NULL, *punw = NULL, *pdyn = NULL;
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Elf64_Ehdr *ehdr;
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int i;
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if (!_Uelf64_valid_object (&edi->ei))
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return -UNW_ENOINFO;
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ehdr = edi->ei.image;
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phdr = (Elf64_Phdr *) ((char *) edi->ei.image + ehdr->e_phoff);
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for (i = 0; i < ehdr->e_phnum; ++i)
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{
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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_offset == mapoff)
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ptxt = phdr + i;
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break;
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case PT_IA_64_UNWIND:
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punw = phdr + i;
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break;
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case PT_DYNAMIC:
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pdyn = phdr + i;
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break;
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default:
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break;
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}
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}
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if (!ptxt || !punw)
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return 0;
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edi->di_cache.start_ip = segbase;
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edi->di_cache.end_ip = edi->di_cache.start_ip + ptxt->p_memsz;
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edi->di_cache.gp = find_gp (edi, pdyn, segbase - ptxt->p_vaddr);
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edi->di_cache.format = UNW_INFO_FORMAT_TABLE;
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edi->di_cache.u.ti.name_ptr = 0;
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edi->di_cache.u.ti.segbase = segbase;
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edi->di_cache.u.ti.table_len = punw->p_memsz / sizeof (unw_word_t);
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edi->di_cache.u.ti.table_data = (unw_word_t *)
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((char *) edi->ei.image + (punw->p_vaddr - ptxt->p_vaddr));
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return 1;
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}
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#elif UNW_TARGET_X86 || UNW_TARGET_X86_64 || UNW_TARGET_HPPA \
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|| UNW_TARGET_PPC32 || UNW_TARGET_PPC64 || UNW_TARGET_ARM
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#include "dwarf-eh.h"
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#include "dwarf_i.h"
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int
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dwarf_find_unwind_table (struct elf_dyn_info *edi, unw_addr_space_t as,
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char *path, unw_word_t segbase, unw_word_t mapoff,
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unw_word_t ip)
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{
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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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Elf_W(Ehdr) *ehdr;
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#if UNW_TARGET_ARM
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const Elf_W(Phdr) *parm_exidx = NULL;
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#endif
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int i, ret, found = 0;
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/* XXX: Much of this code is Linux/LSB-specific. */
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if (!elf_w(valid_object) (&edi->ei))
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return -UNW_ENOINFO;
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ehdr = edi->ei.image;
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phdr = (Elf_W(Phdr) *) ((char *) edi->ei.image + ehdr->e_phoff);
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for (i = 0; i < ehdr->e_phnum; ++i)
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{
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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) edi->ei.image + phdr->p_filesz > max_load_addr)
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max_load_addr = (uintptr_t) edi->ei.image + phdr->p_filesz;
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break;
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case PT_GNU_EH_FRAME:
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peh_hdr = phdr + i;
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break;
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case PT_DYNAMIC:
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pdyn = phdr + i;
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break;
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#if UNW_TARGET_ARM
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case PT_ARM_EXIDX:
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parm_exidx = phdr + i;
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break;
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#endif
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default:
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break;
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}
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}
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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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{
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/* For dynamicly linked executables and shared libraries,
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DT_PLTGOT is the value that data-relative addresses are
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relative to for that object. We call this the "gp". */
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Elf_W(Dyn) *dyn = (Elf_W(Dyn) *)(pdyn->p_offset
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+ (char *) edi->ei.image);
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for (; dyn->d_tag != DT_NULL; ++dyn)
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if (dyn->d_tag == DT_PLTGOT)
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{
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/* Assume that _DYNAMIC is writable and GLIBC has
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relocated it (true for x86 at least). */
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edi->di_cache.gp = dyn->d_un.d_ptr;
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break;
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}
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}
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else
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/* Otherwise this is a static executable with no _DYNAMIC. Assume
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that data-relative addresses are relative to 0, i.e.,
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absolute. */
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edi->di_cache.gp = 0;
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hdr = (struct dwarf_eh_frame_hdr *) (peh_hdr->p_offset
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+ (char *) edi->ei.image);
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if (hdr->version != DW_EH_VERSION)
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{
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Debug (1, "table `%s' has unexpected version %d\n",
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path, hdr->version);
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return -UNW_ENOINFO;
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}
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a = unw_get_accessors (unw_local_addr_space);
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addr = (unw_word_t) (hdr + 1);
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/* Fill in a dummy proc_info structure. We just need to fill in
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enough to ensure that dwarf_read_encoded_pointer() can do it's
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job. Since we don't have a procedure-context at this point, all
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we have to do is fill in the global-pointer. */
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memset (&pi, 0, sizeof (pi));
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pi.gp = edi->di_cache.gp;
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/* (Optionally) read eh_frame_ptr: */
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if ((ret = dwarf_read_encoded_pointer (unw_local_addr_space, a,
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&addr, hdr->eh_frame_ptr_enc, &pi,
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&eh_frame_start, NULL)) < 0)
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return -UNW_ENOINFO;
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/* (Optionally) read fde_count: */
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if ((ret = dwarf_read_encoded_pointer (unw_local_addr_space, a,
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&addr, hdr->fde_count_enc, &pi,
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&fde_count, NULL)) < 0)
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return -UNW_ENOINFO;
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if (hdr->table_enc != (DW_EH_PE_datarel | DW_EH_PE_sdata4))
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{
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#if 1
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abort ();
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#else
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unw_word_t eh_frame_end;
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/* If there is no search table or it has an unsupported
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encoding, fall back on linear search. */
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if (hdr->table_enc == DW_EH_PE_omit)
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Debug (4, "EH lacks search table; doing linear search\n");
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else
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Debug (4, "EH table has encoding 0x%x; doing linear search\n",
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hdr->table_enc);
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eh_frame_end = max_load_addr; /* XXX can we do better? */
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if (hdr->fde_count_enc == DW_EH_PE_omit)
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fde_count = ~0UL;
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if (hdr->eh_frame_ptr_enc == DW_EH_PE_omit)
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abort ();
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return linear_search (unw_local_addr_space, ip,
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eh_frame_start, eh_frame_end, fde_count,
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pi, need_unwind_info, NULL);
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#endif
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}
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edi->di_cache.start_ip = start_ip;
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edi->di_cache.end_ip = end_ip;
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edi->di_cache.format = UNW_INFO_FORMAT_REMOTE_TABLE;
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edi->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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edi->di_cache.u.rti.table_len = (fde_count * 8) / sizeof (unw_word_t);
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edi->di_cache.u.rti.table_data = ((load_base + peh_hdr->p_vaddr)
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+ (addr - (unw_word_t) edi->ei.image
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- peh_hdr->p_offset));
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|
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/* For the binary-search table in the eh_frame_hdr, data-relative
|
||||
means relative to the start of that section... */
|
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edi->di_cache.u.rti.segbase = ((load_base + peh_hdr->p_vaddr)
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+ ((unw_word_t) hdr - (unw_word_t) edi->ei.image
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- peh_hdr->p_offset));
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found = 1;
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}
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#if UNW_TARGET_ARM
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if (parm_exidx)
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{
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edi->di_arm.format = UNW_INFO_FORMAT_ARM_EXIDX;
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edi->di_arm.start_ip = start_ip;
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edi->di_arm.end_ip = end_ip;
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edi->di_arm.u.rti.name_ptr = (unw_word_t) path;
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edi->di_arm.u.rti.table_data = load_base + parm_exidx->p_vaddr;
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edi->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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||||
|
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#ifdef CONFIG_DEBUG_FRAME
|
||||
/* Try .debug_frame. */
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found = dwarf_find_debug_frame (found, &edi->edi.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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}
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||||
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#endif /* UNW_TARGET_X86 || UNW_TARGET_X86_64 || UNW_TARGET_HPPA*/
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5
src/dwarf/Lfind_unwind_table.c
Normal file
5
src/dwarf/Lfind_unwind_table.c
Normal file
@ -0,0 +1,5 @@
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
|
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#if defined(UNW_LOCAL_ONLY) && !defined(UNW_REMOTE_ONLY)
|
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#include "Gfind_unwind_table.c"
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||||
#endif
|
||||
@ -32,332 +32,6 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
||||
|
||||
#include "_UPT_internal.h"
|
||||
|
||||
#if UNW_TARGET_IA64
|
||||
|
||||
#include "elf64.h"
|
||||
|
||||
static unw_word_t
|
||||
find_gp (struct elf_dyn_info *edi, Elf64_Phdr *pdyn, Elf64_Addr load_base)
|
||||
{
|
||||
Elf64_Off soff, str_soff;
|
||||
Elf64_Ehdr *ehdr = edi->ei.image;
|
||||
Elf64_Shdr *shdr;
|
||||
Elf64_Shdr *str_shdr;
|
||||
Elf64_Addr gp = 0;
|
||||
char *strtab;
|
||||
int i;
|
||||
|
||||
if (pdyn)
|
||||
{
|
||||
/* If we have a PT_DYNAMIC program header, fetch the gp-value
|
||||
from the DT_PLTGOT entry. */
|
||||
Elf64_Dyn *dyn = (Elf64_Dyn *) (pdyn->p_offset + (char *) edi->ei.image);
|
||||
for (; dyn->d_tag != DT_NULL; ++dyn)
|
||||
if (dyn->d_tag == DT_PLTGOT)
|
||||
{
|
||||
gp = (Elf64_Addr) dyn->d_un.d_ptr + load_base;
|
||||
goto done;
|
||||
}
|
||||
}
|
||||
|
||||
/* Without a PT_DYAMIC header, lets try to look for a non-empty .opd
|
||||
section. If there is such a section, we know it's full of
|
||||
function descriptors, and we can simply pick up the gp from the
|
||||
second word of the first entry in this table. */
|
||||
|
||||
soff = ehdr->e_shoff;
|
||||
str_soff = soff + (ehdr->e_shstrndx * ehdr->e_shentsize);
|
||||
|
||||
if (soff + ehdr->e_shnum * ehdr->e_shentsize > edi->ei.size)
|
||||
{
|
||||
Debug (1, "section table outside of image? (%lu > %lu)",
|
||||
soff + ehdr->e_shnum * ehdr->e_shentsize,
|
||||
edi->ei.size);
|
||||
goto done;
|
||||
}
|
||||
|
||||
shdr = (Elf64_Shdr *) ((char *) edi->ei.image + soff);
|
||||
str_shdr = (Elf64_Shdr *) ((char *) edi->ei.image + str_soff);
|
||||
strtab = (char *) edi->ei.image + str_shdr->sh_offset;
|
||||
for (i = 0; i < ehdr->e_shnum; ++i)
|
||||
{
|
||||
if (strcmp (strtab + shdr->sh_name, ".opd") == 0
|
||||
&& shdr->sh_size >= 16)
|
||||
{
|
||||
gp = ((Elf64_Addr *) ((char *) edi->ei.image + shdr->sh_offset))[1];
|
||||
goto done;
|
||||
}
|
||||
shdr = (Elf64_Shdr *) (((char *) shdr) + ehdr->e_shentsize);
|
||||
}
|
||||
|
||||
done:
|
||||
Debug (16, "image at %p, gp = %lx\n", edi->ei.image, gp);
|
||||
return gp;
|
||||
}
|
||||
|
||||
HIDDEN int
|
||||
_UPTi_find_unwind_table (struct elf_dyn_info *edi, unw_addr_space_t as,
|
||||
char *path, unw_word_t segbase, unw_word_t mapoff,
|
||||
unw_word_t ip)
|
||||
{
|
||||
Elf64_Phdr *phdr, *ptxt = NULL, *punw = NULL, *pdyn = NULL;
|
||||
Elf64_Ehdr *ehdr;
|
||||
int i;
|
||||
|
||||
if (!_Uelf64_valid_object (&edi->ei))
|
||||
return -UNW_ENOINFO;
|
||||
|
||||
ehdr = edi->ei.image;
|
||||
phdr = (Elf64_Phdr *) ((char *) edi->ei.image + ehdr->e_phoff);
|
||||
|
||||
for (i = 0; i < ehdr->e_phnum; ++i)
|
||||
{
|
||||
switch (phdr[i].p_type)
|
||||
{
|
||||
case PT_LOAD:
|
||||
if (phdr[i].p_offset == mapoff)
|
||||
ptxt = phdr + i;
|
||||
break;
|
||||
|
||||
case PT_IA_64_UNWIND:
|
||||
punw = phdr + i;
|
||||
break;
|
||||
|
||||
case PT_DYNAMIC:
|
||||
pdyn = phdr + i;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!ptxt || !punw)
|
||||
return 0;
|
||||
|
||||
edi->di_cache.start_ip = segbase;
|
||||
edi->di_cache.end_ip = edi->di_cache.start_ip + ptxt->p_memsz;
|
||||
edi->di_cache.gp = find_gp (edi, pdyn, segbase - ptxt->p_vaddr);
|
||||
edi->di_cache.format = UNW_INFO_FORMAT_TABLE;
|
||||
edi->di_cache.u.ti.name_ptr = 0;
|
||||
edi->di_cache.u.ti.segbase = segbase;
|
||||
edi->di_cache.u.ti.table_len = punw->p_memsz / sizeof (unw_word_t);
|
||||
edi->di_cache.u.ti.table_data = (unw_word_t *)
|
||||
((char *) edi->ei.image + (punw->p_vaddr - ptxt->p_vaddr));
|
||||
return 1;
|
||||
}
|
||||
|
||||
#elif UNW_TARGET_X86 || UNW_TARGET_X86_64 || UNW_TARGET_HPPA \
|
||||
|| UNW_TARGET_PPC32 || UNW_TARGET_PPC64 || UNW_TARGET_ARM
|
||||
|
||||
#include "dwarf-eh.h"
|
||||
#include "dwarf_i.h"
|
||||
|
||||
/* We need our own instance of dwarf_read_encoded_pointer() here since
|
||||
the one in dwarf/Gpe.c is not (and should not be) exported. */
|
||||
int
|
||||
dwarf_read_encoded_pointer (unw_addr_space_t as, unw_accessors_t *a,
|
||||
unw_word_t *addr, unsigned char encoding,
|
||||
const unw_proc_info_t *pi,
|
||||
unw_word_t *valp, void *arg)
|
||||
{
|
||||
return dwarf_read_encoded_pointer_inlined (as, a, addr, encoding,
|
||||
pi, valp, arg);
|
||||
}
|
||||
|
||||
HIDDEN int
|
||||
_UPTi_find_unwind_table (struct elf_dyn_info *edi, unw_addr_space_t as,
|
||||
char *path, unw_word_t segbase, unw_word_t mapoff,
|
||||
unw_word_t ip)
|
||||
{
|
||||
Elf_W(Phdr) *phdr, *ptxt = NULL, *peh_hdr = NULL, *pdyn = NULL;
|
||||
unw_word_t addr, eh_frame_start, fde_count, load_base;
|
||||
unw_word_t max_load_addr = 0;
|
||||
unw_word_t start_ip = (unw_word_t) -1;
|
||||
unw_word_t end_ip = 0;
|
||||
struct dwarf_eh_frame_hdr *hdr;
|
||||
unw_proc_info_t pi;
|
||||
unw_accessors_t *a;
|
||||
Elf_W(Ehdr) *ehdr;
|
||||
#if UNW_TARGET_ARM
|
||||
const Elf_W(Phdr) *parm_exidx = NULL;
|
||||
#endif
|
||||
int i, ret, found = 0;
|
||||
|
||||
/* XXX: Much of this code is Linux/LSB-specific. */
|
||||
|
||||
if (!elf_w(valid_object) (&edi->ei))
|
||||
return -UNW_ENOINFO;
|
||||
|
||||
ehdr = edi->ei.image;
|
||||
phdr = (Elf_W(Phdr) *) ((char *) edi->ei.image + ehdr->e_phoff);
|
||||
|
||||
for (i = 0; i < ehdr->e_phnum; ++i)
|
||||
{
|
||||
switch (phdr[i].p_type)
|
||||
{
|
||||
case PT_LOAD:
|
||||
if (phdr[i].p_vaddr < start_ip)
|
||||
start_ip = phdr[i].p_vaddr;
|
||||
|
||||
if (phdr[i].p_vaddr + phdr[i].p_memsz > end_ip)
|
||||
end_ip = phdr[i].p_vaddr + phdr[i].p_memsz;
|
||||
|
||||
if (phdr[i].p_offset == mapoff)
|
||||
ptxt = phdr + i;
|
||||
if ((uintptr_t) edi->ei.image + phdr->p_filesz > max_load_addr)
|
||||
max_load_addr = (uintptr_t) edi->ei.image + phdr->p_filesz;
|
||||
break;
|
||||
|
||||
case PT_GNU_EH_FRAME:
|
||||
peh_hdr = phdr + i;
|
||||
break;
|
||||
|
||||
case PT_DYNAMIC:
|
||||
pdyn = phdr + i;
|
||||
break;
|
||||
|
||||
#if UNW_TARGET_ARM
|
||||
case PT_ARM_EXIDX:
|
||||
parm_exidx = phdr + i;
|
||||
break;
|
||||
#endif
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!ptxt)
|
||||
return 0;
|
||||
|
||||
load_base = segbase - ptxt->p_vaddr;
|
||||
start_ip += load_base;
|
||||
end_ip += load_base;
|
||||
|
||||
if (peh_hdr)
|
||||
{
|
||||
if (pdyn)
|
||||
{
|
||||
/* For dynamicly linked executables and shared libraries,
|
||||
DT_PLTGOT is the value that data-relative addresses are
|
||||
relative to for that object. We call this the "gp". */
|
||||
Elf_W(Dyn) *dyn = (Elf_W(Dyn) *)(pdyn->p_offset
|
||||
+ (char *) edi->ei.image);
|
||||
for (; dyn->d_tag != DT_NULL; ++dyn)
|
||||
if (dyn->d_tag == DT_PLTGOT)
|
||||
{
|
||||
/* Assume that _DYNAMIC is writable and GLIBC has
|
||||
relocated it (true for x86 at least). */
|
||||
edi->di_cache.gp = dyn->d_un.d_ptr;
|
||||
break;
|
||||
}
|
||||
}
|
||||
else
|
||||
/* Otherwise this is a static executable with no _DYNAMIC. Assume
|
||||
that data-relative addresses are relative to 0, i.e.,
|
||||
absolute. */
|
||||
edi->di_cache.gp = 0;
|
||||
|
||||
hdr = (struct dwarf_eh_frame_hdr *) (peh_hdr->p_offset
|
||||
+ (char *) edi->ei.image);
|
||||
if (hdr->version != DW_EH_VERSION)
|
||||
{
|
||||
Debug (1, "table `%s' has unexpected version %d\n",
|
||||
path, hdr->version);
|
||||
return -UNW_ENOINFO;
|
||||
}
|
||||
|
||||
a = unw_get_accessors (unw_local_addr_space);
|
||||
addr = (unw_word_t) (hdr + 1);
|
||||
|
||||
/* Fill in a dummy proc_info structure. We just need to fill in
|
||||
enough to ensure that dwarf_read_encoded_pointer() can do it's
|
||||
job. Since we don't have a procedure-context at this point, all
|
||||
we have to do is fill in the global-pointer. */
|
||||
memset (&pi, 0, sizeof (pi));
|
||||
pi.gp = edi->di_cache.gp;
|
||||
|
||||
/* (Optionally) read eh_frame_ptr: */
|
||||
if ((ret = dwarf_read_encoded_pointer (unw_local_addr_space, a,
|
||||
&addr, hdr->eh_frame_ptr_enc, &pi,
|
||||
&eh_frame_start, NULL)) < 0)
|
||||
return -UNW_ENOINFO;
|
||||
|
||||
/* (Optionally) read fde_count: */
|
||||
if ((ret = dwarf_read_encoded_pointer (unw_local_addr_space, a,
|
||||
&addr, hdr->fde_count_enc, &pi,
|
||||
&fde_count, NULL)) < 0)
|
||||
return -UNW_ENOINFO;
|
||||
|
||||
if (hdr->table_enc != (DW_EH_PE_datarel | DW_EH_PE_sdata4))
|
||||
{
|
||||
#if 1
|
||||
abort ();
|
||||
#else
|
||||
unw_word_t eh_frame_end;
|
||||
|
||||
/* If there is no search table or it has an unsupported
|
||||
encoding, fall back on linear search. */
|
||||
if (hdr->table_enc == DW_EH_PE_omit)
|
||||
Debug (4, "EH lacks search table; doing linear search\n");
|
||||
else
|
||||
Debug (4, "EH table has encoding 0x%x; doing linear search\n",
|
||||
hdr->table_enc);
|
||||
|
||||
eh_frame_end = max_load_addr; /* XXX can we do better? */
|
||||
|
||||
if (hdr->fde_count_enc == DW_EH_PE_omit)
|
||||
fde_count = ~0UL;
|
||||
if (hdr->eh_frame_ptr_enc == DW_EH_PE_omit)
|
||||
abort ();
|
||||
|
||||
return linear_search (unw_local_addr_space, ip,
|
||||
eh_frame_start, eh_frame_end, fde_count,
|
||||
pi, need_unwind_info, NULL);
|
||||
#endif
|
||||
}
|
||||
|
||||
edi->di_cache.start_ip = start_ip;
|
||||
edi->di_cache.end_ip = end_ip;
|
||||
edi->di_cache.format = UNW_INFO_FORMAT_REMOTE_TABLE;
|
||||
edi->di_cache.u.rti.name_ptr = 0;
|
||||
/* two 32-bit values (ip_offset/fde_offset) per table-entry: */
|
||||
edi->di_cache.u.rti.table_len = (fde_count * 8) / sizeof (unw_word_t);
|
||||
edi->di_cache.u.rti.table_data = ((load_base + peh_hdr->p_vaddr)
|
||||
+ (addr - (unw_word_t) edi->ei.image
|
||||
- peh_hdr->p_offset));
|
||||
|
||||
/* For the binary-search table in the eh_frame_hdr, data-relative
|
||||
means relative to the start of that section... */
|
||||
edi->di_cache.u.rti.segbase = ((load_base + peh_hdr->p_vaddr)
|
||||
+ ((unw_word_t) hdr - (unw_word_t) edi->ei.image
|
||||
- peh_hdr->p_offset));
|
||||
found = 1;
|
||||
}
|
||||
|
||||
#if UNW_TARGET_ARM
|
||||
if (parm_exidx)
|
||||
{
|
||||
edi->di_arm.format = UNW_INFO_FORMAT_ARM_EXIDX;
|
||||
edi->di_arm.start_ip = start_ip;
|
||||
edi->di_arm.end_ip = end_ip;
|
||||
edi->di_arm.u.rti.name_ptr = (unw_word_t) path;
|
||||
edi->di_arm.u.rti.table_data = load_base + parm_exidx->p_vaddr;
|
||||
edi->di_arm.u.rti.table_len = parm_exidx->p_memsz;
|
||||
found = 1;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_DEBUG_FRAME
|
||||
/* Try .debug_frame. */
|
||||
found = dwarf_find_debug_frame (found, &edi->edi.di_debug, ip, segbase, path,
|
||||
start_ip, end_ip);
|
||||
#endif
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
#endif /* UNW_TARGET_X86 || UNW_TARGET_X86_64 || UNW_TARGET_HPPA*/
|
||||
|
||||
static int
|
||||
get_unwind_info (struct elf_dyn_info *edi, pid_t pid, unw_addr_space_t as, unw_word_t ip)
|
||||
@ -391,7 +65,7 @@ get_unwind_info (struct elf_dyn_info *edi, pid_t pid, unw_addr_space_t as, unw_w
|
||||
|
||||
/* Here, SEGBASE is the starting-address of the (mmap'ped) segment
|
||||
which covers the IP we're looking for. */
|
||||
if (_UPTi_find_unwind_table (edi, as, path, segbase, mapoff, ip) < 0)
|
||||
if (dwarf_find_unwind_table (edi, as, path, segbase, mapoff, ip) < 0)
|
||||
return -UNW_ENOINFO;
|
||||
|
||||
/* This can happen in corner cases where dynamically generated
|
||||
|
||||
@ -54,7 +54,7 @@ get_list_addr (unw_addr_space_t as, unw_word_t *dil_addr, void *arg,
|
||||
|
||||
Debug (16, "checking object %s\n", path);
|
||||
|
||||
if (_UPTi_find_unwind_table (&ui->edi, as, path, lo, off, 0) > 0)
|
||||
if (dwarf_find_unwind_table (&ui->edi, as, path, lo, off, 0) > 0)
|
||||
{
|
||||
res = _Uia64_find_dyn_list (as, &ui->edi.di_cache, arg);
|
||||
if (res && count++ == 0)
|
||||
|
||||
@ -56,11 +56,4 @@ struct UPT_info
|
||||
|
||||
extern int _UPT_reg_offset[UNW_REG_LAST + 1];
|
||||
|
||||
extern int _UPTi_find_unwind_table (struct elf_dyn_info *ui,
|
||||
unw_addr_space_t as,
|
||||
char *path,
|
||||
unw_word_t segbase,
|
||||
unw_word_t mapoff,
|
||||
unw_word_t ip);
|
||||
|
||||
#endif /* _UPT_internal_h */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user