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Move some dwarf functionality from ptrace to dwarf

Browse source 
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 2012-03-12 18:45:40 -07:00
parent 25ee9f8172
commit 6525714c27
7 changed files with 364 additions and 337 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/dwarf.h
View file

@ -37,6 +37,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <libunwind.h>
struct dwarf_cursor; /* forward-declaration */
struct elf_dyn_info;
#include "dwarf-config.h"
#ifndef UNW_REMOTE_ONLY
@ -368,6 +369,7 @@ struct dwarf_callback_data
#define dwarf_find_proc_info UNW_OBJ (dwarf_find_proc_info)
#define dwarf_find_debug_frame UNW_OBJ (dwarf_find_debug_frame)
#define dwarf_search_unwind_table UNW_OBJ (dwarf_search_unwind_table)
#define dwarf_find_unwind_table UNW_OBJ (dwarf_find_unwind_table)
#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
#define dwarf_put_unwind_info UNW_OBJ (dwarf_put_unwind_info)
#define dwarf_eval_expr UNW_OBJ (dwarf_eval_expr)
@ -395,6 +397,9 @@ extern int dwarf_search_unwind_table (unw_addr_space_t as,
unw_dyn_info_t *di,
unw_proc_info_t *pi,
int need_unwind_info, void *arg);
extern int dwarf_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);
extern void dwarf_put_unwind_info (unw_addr_space_t as,
unw_proc_info_t *pi, void *arg);
extern int dwarf_eval_expr (struct dwarf_cursor *c, unw_word_t *addr,

6
src/Makefile.am
View file

@ -109,12 +109,14 @@ libunwind_dwarf_common_la_SOURCES = dwarf/global.c
libunwind_dwarf_local_la_SOURCES = \
dwarf/Lexpr.c dwarf/Lfde.c dwarf/Lparser.c dwarf/Lpe.c dwarf/Lstep.c \
dwarf/Lfind_proc_info-lsb.c
dwarf/Lfind_proc_info-lsb.c \
dwarf/Lfind_unwind_table.c
libunwind_dwarf_local_la_LIBADD = libunwind-dwarf-common.la
libunwind_dwarf_generic_la_SOURCES = \
dwarf/Gexpr.c dwarf/Gfde.c dwarf/Gparser.c dwarf/Gpe.c dwarf/Gstep.c \
dwarf/Gfind_proc_info-lsb.c
dwarf/Gfind_proc_info-lsb.c \
dwarf/Gfind_unwind_table.c
libunwind_dwarf_generic_la_LIBADD = libunwind-dwarf-common.la
if USE_DWARF

348
src/dwarf/Gfind_unwind_table.c Normal file
View file

@ -0,0 +1,348 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2003-2004 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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 <elf.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include "libunwind_i.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;
}
int
dwarf_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"
int
dwarf_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*/

5
src/dwarf/Lfind_unwind_table.c Normal file
View file

@ -0,0 +1,5 @@
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#if defined(UNW_LOCAL_ONLY) && !defined(UNW_REMOTE_ONLY)
#include "Gfind_unwind_table.c"
#endif

328
src/ptrace/_UPT_find_proc_info.c
View file

@ -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

2
src/ptrace/_UPT_get_dyn_info_list_addr.c
View file

@ -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)

7
src/ptrace/_UPT_internal.h
View file

@ -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 */