779 lines
22 KiB
C
779 lines
22 KiB
C
/* Copyright (C) 2001-2017 Free Software Foundation, Inc.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3, or (at your option)
|
|
any later version.
|
|
|
|
GCC is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* Locate the FDE entry for a given address, using PT_GNU_EH_FRAME ELF
|
|
segment and dl_iterate_phdr to avoid register/deregister calls at
|
|
DSO load/unload. */
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1
|
|
#endif
|
|
|
|
#include "tconfig.h"
|
|
#include "tsystem.h"
|
|
#if !defined(inhibit_libc) && !defined(__OpenBSD__) && !defined(__QNX__)
|
|
#include <elf.h> /* Get DT_CONFIG. */
|
|
#elif defined(__QNX__)
|
|
#include <sys/elf.h>
|
|
#endif
|
|
#include "coretypes.h"
|
|
#include "tm.h"
|
|
#include "libgcc_tm.h"
|
|
#include "dwarf2.h"
|
|
#include "unwind.h"
|
|
#define NO_BASE_OF_ENCODED_VALUE
|
|
#include "unwind-pe.h"
|
|
#include "unwind-dw2-fde.h"
|
|
#include "unwind-compat.h"
|
|
#include "gthr.h"
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
|
|
|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& defined(__BIONIC__)
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& defined(TARGET_DL_ITERATE_PHDR) \
|
|
&& defined(__linux__)
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& defined(TARGET_DL_ITERATE_PHDR) \
|
|
&& (defined(__DragonFly__) || defined(__FreeBSD__))
|
|
# define ElfW __ElfN
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& (defined(__OpenBSD__) || defined(__NetBSD__))
|
|
# define ElfW(type) Elf_##type
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
|
|
&& defined(TARGET_DL_ITERATE_PHDR) \
|
|
&& defined(__sun__) && defined(__svr4__)
|
|
# define USE_PT_GNU_EH_FRAME
|
|
#endif
|
|
|
|
#if defined(USE_PT_GNU_EH_FRAME)
|
|
|
|
#include <link.h>
|
|
|
|
#ifndef __RELOC_POINTER
|
|
# if ! (defined (__e2k__) && defined (__ptr128__))
|
|
# define __RELOC_POINTER(ptr, base) ((ptr) + (base))
|
|
# else /* defined (__e2k__) && defined (__ptr128__) */
|
|
// # define __RELOC_POINTER(idx, ap) &ap[idx]
|
|
# endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
#endif
|
|
|
|
static const fde * _Unwind_Find_registered_FDE (
|
|
#if ! (defined (__e2k__) && defined ( __ptr128__))
|
|
void *pc,
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr pc,
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
struct dwarf_eh_bases *bases);
|
|
|
|
#define _Unwind_Find_FDE _Unwind_Find_registered_FDE
|
|
#include "unwind-dw2-fde.c"
|
|
#undef _Unwind_Find_FDE
|
|
|
|
#ifndef PT_GNU_EH_FRAME
|
|
#define PT_GNU_EH_FRAME (PT_LOOS + 0x474e550)
|
|
#endif
|
|
|
|
struct unw_eh_callback_data
|
|
{
|
|
_Unwind_Ptr pc;
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
void *tbase;
|
|
void *dbase;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr tbase;
|
|
_Unwind_Ptr dbase;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
void *func;
|
|
const fde *ret;
|
|
int check_cache;
|
|
};
|
|
|
|
struct unw_eh_frame_hdr
|
|
{
|
|
unsigned char version;
|
|
unsigned char eh_frame_ptr_enc;
|
|
unsigned char fde_count_enc;
|
|
unsigned char table_enc;
|
|
};
|
|
|
|
#define FRAME_HDR_CACHE_SIZE 8
|
|
|
|
static struct frame_hdr_cache_element
|
|
{
|
|
_Unwind_Ptr pc_low;
|
|
_Unwind_Ptr pc_high;
|
|
#if defined __FRV_FDPIC__ || defined __BFIN_FDPIC__
|
|
struct elf32_fdpic_loadaddr load_base;
|
|
#else
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
_Unwind_Ptr load_base;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr text_base;
|
|
const char *gd;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
#endif
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
const ElfW(Phdr) *p_eh_frame_hdr;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
const struct unw_eh_frame_hdr *eh_frame_hdr_contents;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
const ElfW(Phdr) *p_dynamic;
|
|
struct frame_hdr_cache_element *link;
|
|
} frame_hdr_cache[FRAME_HDR_CACHE_SIZE];
|
|
|
|
static struct frame_hdr_cache_element *frame_hdr_cache_head;
|
|
|
|
/* Like base_of_encoded_value, but take the base from a struct
|
|
unw_eh_callback_data instead of an _Unwind_Context. */
|
|
|
|
static _Unwind_Ptr
|
|
base_from_cb_data (unsigned char encoding, struct unw_eh_callback_data *data)
|
|
{
|
|
if (encoding == DW_EH_PE_omit)
|
|
return 0;
|
|
|
|
switch (encoding & 0x70)
|
|
{
|
|
case DW_EH_PE_absptr:
|
|
case DW_EH_PE_pcrel:
|
|
case DW_EH_PE_aligned:
|
|
return 0;
|
|
|
|
case DW_EH_PE_textrel:
|
|
return (_Unwind_Ptr) data->tbase;
|
|
case DW_EH_PE_datarel:
|
|
return (_Unwind_Ptr) data->dbase;
|
|
default:
|
|
gcc_unreachable ();
|
|
}
|
|
}
|
|
|
|
#if defined __e2k__ && defined __ptr128__
|
|
|
|
static unsigned int
|
|
get_range_num (const char *gd,
|
|
unsigned int phnum,
|
|
const ElfW(Phdr) *phdrs)
|
|
{
|
|
unsigned int i = 0;
|
|
const ElfW(Phdr) *phdr;
|
|
|
|
for (phdr = &phdrs[0]; phdr < &phdrs[phnum]; phdr++)
|
|
{
|
|
if (phdr->p_type == PT_LOAD)
|
|
{
|
|
++i;
|
|
/* Use the same criterium as in glibc to distinguish between legacy
|
|
and packed PM ELFs. */
|
|
if (phdr->p_offset == 0 && !(phdr->p_flags & PF_X))
|
|
{
|
|
uintptr_t phdr_offset = (uintptr_t) phdrs - (uintptr_t) gd;
|
|
if (phdr_offset >= phdr->p_vaddr)
|
|
/* Good chances are that this is a legacy PM ELF. */
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
struct range
|
|
{
|
|
uintptr_t min;
|
|
uintptr_t max;
|
|
uintptr_t align;
|
|
long delta;
|
|
int in_cud;
|
|
};
|
|
|
|
static void
|
|
fill_ranges (unsigned int phnum,
|
|
const ElfW(Phdr) *phdrs,
|
|
unsigned int range_num,
|
|
struct range *ranges)
|
|
{
|
|
unsigned int i;
|
|
const ElfW(Phdr) *phdr;
|
|
|
|
for (phdr = phdrs, i = 0;
|
|
(phdr < &phdrs[phnum]
|
|
/* Just to be on the safe side. */
|
|
&& i < range_num);
|
|
++phdr)
|
|
{
|
|
if (phdr->p_type == PT_LOAD)
|
|
{
|
|
ranges[i].min = phdr->p_vaddr;
|
|
ranges[i].max = phdr->p_vaddr + phdr->p_memsz;
|
|
ranges[i].align = phdr->p_align;
|
|
ranges[i].in_cud = (phdr->p_flags & PF_X) ? 1 : 0;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
/* Stupidly sort the obtained ranges. I believe that qsort () may be
|
|
unavailable in context of ld.so */
|
|
for (i = 0; i < range_num - 1; i++)
|
|
{
|
|
unsigned int j;
|
|
for (j = i + 1; j < range_num; j++)
|
|
{
|
|
if (ranges[j].min < ranges[i].min)
|
|
{
|
|
struct range tmp = ranges[i];
|
|
ranges[i] = ranges[j];
|
|
ranges[j] = tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
uintptr_t max_page_aligned = 0;
|
|
uintptr_t cud_size = 0, gd_size = 0;
|
|
|
|
for (i = 0; i < range_num; i++)
|
|
{
|
|
uintptr_t min_page_aligned = ranges[i].min & ~(ranges[i].align - 1);
|
|
uintptr_t b, r, pos;
|
|
|
|
/* MAX_PAGE_ALIGNED corresponds to the preceding segment in this
|
|
comparison, of course. */
|
|
if (min_page_aligned < max_page_aligned)
|
|
{
|
|
/* The Kernel should have failed to load this executable
|
|
in such a case. */
|
|
}
|
|
|
|
max_page_aligned = (ranges[i].max + 0xfffULL) & ~(0xfffULL);
|
|
|
|
if (ranges[i].in_cud)
|
|
pos = cud_size;
|
|
else
|
|
pos = gd_size;
|
|
|
|
pos = (pos + 0xfffULL) & ~0xfffULL;
|
|
r = ranges[i].min & (ranges[i].align - 1);
|
|
b = (pos + ranges[i].align - (r + 1)) / ranges[i].align;
|
|
pos = b * ranges[i].align + r;
|
|
|
|
ranges[i].delta = pos - ranges[i].min;
|
|
pos += ranges[i].max - ranges[i].min;
|
|
|
|
if (ranges[i].in_cud)
|
|
cud_size = pos;
|
|
else
|
|
gd_size = pos;
|
|
}
|
|
}
|
|
|
|
long
|
|
get_offset_delta (const char *gd,
|
|
unsigned int phnum,
|
|
const ElfW(Phdr) *phdrs,
|
|
uintptr_t off)
|
|
{
|
|
unsigned int range_num = get_range_num (gd, phnum, phdrs);
|
|
struct range ranges[range_num];
|
|
fill_ranges (phnum, phdrs, range_num, ranges);
|
|
unsigned int j;
|
|
|
|
for (j = 0; j < range_num; j++)
|
|
{
|
|
if (off >= ranges[j].min && off < ranges[j].max)
|
|
return ranges[j].delta;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* defined __e2k__ && defined __ptr128__ */
|
|
|
|
static int
|
|
_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
|
|
{
|
|
struct unw_eh_callback_data *data = (struct unw_eh_callback_data *) ptr;
|
|
const ElfW(Phdr) *phdr;
|
|
# if ! (defined (__e2k__) && defined (__ptr128__))
|
|
const ElfW(Phdr) *p_eh_frame_hdr;
|
|
#endif /* ! (defined (__e2k__) && defined (__ptr128__)) */
|
|
const ElfW(Phdr) *p_dynamic;
|
|
long n, match;
|
|
#if defined __FRV_FDPIC__ || defined __BFIN_FDPIC__
|
|
struct elf32_fdpic_loadaddr load_base;
|
|
#else
|
|
|
|
# if ! (defined (__e2k__) && defined (__ptr128__))
|
|
_Unwind_Ptr load_base;
|
|
# else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr text_base;
|
|
const char *gd;
|
|
# endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
#endif
|
|
const unsigned char *p;
|
|
const struct unw_eh_frame_hdr *hdr;
|
|
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
_Unwind_Ptr eh_frame;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr eh_frame_off;
|
|
void *eh_frame;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
struct object ob;
|
|
_Unwind_Ptr pc_low = 0, pc_high = 0;
|
|
|
|
struct ext_dl_phdr_info
|
|
{
|
|
ElfW(Addr) dlpi_addr;
|
|
|
|
#if defined (__e2k__) && defined (__ptr128__)
|
|
const char *dlpi_gd;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
|
|
const char *dlpi_name;
|
|
const ElfW(Phdr) *dlpi_phdr;
|
|
ElfW(Half) dlpi_phnum;
|
|
unsigned long long int dlpi_adds;
|
|
unsigned long long int dlpi_subs;
|
|
};
|
|
|
|
match = 0;
|
|
phdr = info->dlpi_phdr;
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
load_base = info->dlpi_addr;
|
|
p_eh_frame_hdr = NULL;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
text_base = info->dlpi_addr;
|
|
gd = info->dlpi_gd;
|
|
hdr = NULL;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
p_dynamic = NULL;
|
|
|
|
struct frame_hdr_cache_element *prev_cache_entry = NULL,
|
|
*last_cache_entry = NULL;
|
|
|
|
if (data->check_cache && size >= sizeof (struct ext_dl_phdr_info))
|
|
{
|
|
static unsigned long long adds = -1ULL, subs;
|
|
struct ext_dl_phdr_info *einfo = (struct ext_dl_phdr_info *) info;
|
|
|
|
/* We use a least recently used cache replacement policy. Also,
|
|
the most recently used cache entries are placed at the head
|
|
of the search chain. */
|
|
|
|
if (einfo->dlpi_adds == adds && einfo->dlpi_subs == subs)
|
|
{
|
|
/* Find data->pc in shared library cache.
|
|
Set load_base, p_eh_frame_hdr and p_dynamic
|
|
plus match from the cache and goto
|
|
"Read .eh_frame_hdr header." below. */
|
|
|
|
struct frame_hdr_cache_element *cache_entry;
|
|
|
|
for (cache_entry = frame_hdr_cache_head;
|
|
cache_entry;
|
|
cache_entry = cache_entry->link)
|
|
{
|
|
if (data->pc >= cache_entry->pc_low
|
|
&& data->pc < cache_entry->pc_high)
|
|
{
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
load_base = cache_entry->load_base;
|
|
p_eh_frame_hdr = cache_entry->p_eh_frame_hdr;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
text_base = cache_entry->text_base;
|
|
gd = cache_entry->gd;
|
|
hdr = cache_entry->eh_frame_hdr_contents;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
p_dynamic = cache_entry->p_dynamic;
|
|
|
|
/* And move the entry we're using to the head. */
|
|
if (cache_entry != frame_hdr_cache_head)
|
|
{
|
|
prev_cache_entry->link = cache_entry->link;
|
|
cache_entry->link = frame_hdr_cache_head;
|
|
frame_hdr_cache_head = cache_entry;
|
|
}
|
|
goto found;
|
|
}
|
|
|
|
last_cache_entry = cache_entry;
|
|
/* Exit early if we found an unused entry. */
|
|
if ((cache_entry->pc_low | cache_entry->pc_high) == 0)
|
|
break;
|
|
if (cache_entry->link != NULL)
|
|
prev_cache_entry = cache_entry;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
adds = einfo->dlpi_adds;
|
|
subs = einfo->dlpi_subs;
|
|
/* Initialize the cache. Create a chain of cache entries,
|
|
with the final one terminated by a NULL link. */
|
|
int i;
|
|
for (i = 0; i < FRAME_HDR_CACHE_SIZE; i++)
|
|
{
|
|
frame_hdr_cache[i].pc_low = 0;
|
|
frame_hdr_cache[i].pc_high = 0;
|
|
frame_hdr_cache[i].link = &frame_hdr_cache[i+1];
|
|
}
|
|
frame_hdr_cache[i-1].link = NULL;
|
|
frame_hdr_cache_head = &frame_hdr_cache[0];
|
|
data->check_cache = 0;
|
|
}
|
|
}
|
|
|
|
/* Make sure struct dl_phdr_info is at least as big as we need. */
|
|
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
|
|
+ sizeof (info->dlpi_phnum))
|
|
return -1;
|
|
|
|
/* See if PC falls into one of the loaded segments. Find the eh_frame
|
|
segment at the same time. */
|
|
for (n = info->dlpi_phnum; --n >= 0; phdr++)
|
|
{
|
|
if (phdr->p_type == PT_LOAD
|
|
#if defined (__e2k__) && defined (__ptr128__)
|
|
/* Ensure that the segment under consideration belongs to the text
|
|
segment in PM. Otherwise, the calculation of VADDR below won't
|
|
make any sense. */
|
|
&& (phdr->p_flags & PF_X)
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
)
|
|
{
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
_Unwind_Ptr vaddr = (_Unwind_Ptr)
|
|
__RELOC_POINTER (phdr->p_vaddr, load_base);
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr vaddr = (text_base + phdr->p_vaddr
|
|
+ get_offset_delta (info->dlpi_gd,
|
|
info->dlpi_phnum,
|
|
info->dlpi_phdr,
|
|
phdr->p_vaddr));
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
|
|
{
|
|
match = 1;
|
|
pc_low = vaddr;
|
|
pc_high = vaddr + phdr->p_memsz;
|
|
}
|
|
}
|
|
else if (phdr->p_type == PT_GNU_EH_FRAME)
|
|
{
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
p_eh_frame_hdr = phdr;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
/* One finds himself here if the matching hash entry does not exist
|
|
yet. So, gd should still contain info->dlpi_gd set in the very
|
|
beginning of this function. */
|
|
gcc_assert (gd == info->dlpi_gd);
|
|
hdr = ((const struct unw_eh_frame_hdr *)
|
|
&gd[phdr->p_vaddr
|
|
+ get_offset_delta (gd,
|
|
info->dlpi_phnum,
|
|
info->dlpi_phdr,
|
|
phdr->p_vaddr)]);
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
}
|
|
#ifdef PT_SUNW_UNWIND
|
|
/* Sun ld emits PT_SUNW_UNWIND .eh_frame_hdr sections instead of
|
|
PT_SUNW_EH_FRAME/PT_GNU_EH_FRAME, so accept them as well. */
|
|
else if (phdr->p_type == PT_SUNW_UNWIND)
|
|
p_eh_frame_hdr = phdr;
|
|
#endif
|
|
else if (phdr->p_type == PT_DYNAMIC)
|
|
p_dynamic = phdr;
|
|
}
|
|
|
|
if (!match)
|
|
return 0;
|
|
|
|
if (size >= sizeof (struct ext_dl_phdr_info))
|
|
{
|
|
/* Move the cache entry we're about to overwrite to the head of
|
|
the list. If either last_cache_entry or prev_cache_entry are
|
|
NULL, that cache entry is already at the head. */
|
|
if (last_cache_entry != NULL && prev_cache_entry != NULL)
|
|
{
|
|
prev_cache_entry->link = last_cache_entry->link;
|
|
last_cache_entry->link = frame_hdr_cache_head;
|
|
frame_hdr_cache_head = last_cache_entry;
|
|
}
|
|
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
frame_hdr_cache_head->load_base = load_base;
|
|
frame_hdr_cache_head->p_eh_frame_hdr = p_eh_frame_hdr;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
frame_hdr_cache_head->text_base = text_base;
|
|
frame_hdr_cache_head->gd = gd;
|
|
frame_hdr_cache_head->eh_frame_hdr_contents = hdr;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
|
|
frame_hdr_cache_head->p_dynamic = p_dynamic;
|
|
frame_hdr_cache_head->pc_low = pc_low;
|
|
frame_hdr_cache_head->pc_high = pc_high;
|
|
}
|
|
|
|
found:
|
|
|
|
if (
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
!p_eh_frame_hdr
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
!hdr
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
)
|
|
return 0;
|
|
|
|
/* Read .eh_frame_hdr header. */
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
hdr = (const struct unw_eh_frame_hdr *)
|
|
__RELOC_POINTER (p_eh_frame_hdr->p_vaddr, load_base);
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
/* In PM it has already been read or fetched from the cache above. */
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
if (hdr->version != 1)
|
|
return 1;
|
|
|
|
#ifdef CRT_GET_RFIB_DATA
|
|
# ifdef __i386__
|
|
data->dbase = NULL;
|
|
if (p_dynamic)
|
|
{
|
|
/* For dynamically linked executables and shared libraries,
|
|
DT_PLTGOT is the gp value for that object. */
|
|
ElfW(Dyn) *dyn = (ElfW(Dyn) *)
|
|
__RELOC_POINTER (p_dynamic->p_vaddr, load_base);
|
|
for (; dyn->d_tag != DT_NULL ; dyn++)
|
|
if (dyn->d_tag == DT_PLTGOT)
|
|
{
|
|
data->dbase = (void *) dyn->d_un.d_ptr;
|
|
# if defined __linux__
|
|
/* On IA-32 Linux, _DYNAMIC is writable and GLIBC has
|
|
relocated it. */
|
|
# elif defined __sun__ && defined __svr4__
|
|
/* On Solaris 2/x86, we need to do this ourselves. */
|
|
data->dbase += load_base;
|
|
# endif
|
|
break;
|
|
}
|
|
}
|
|
# elif (defined __FRV_FDPIC__ || defined __BFIN_FDPIC__) && defined __linux__
|
|
data->dbase = load_base.got_value;
|
|
# else
|
|
# error What is DW_EH_PE_datarel base on this platform?
|
|
# endif
|
|
#endif
|
|
|
|
p = read_encoded_value_with_base (hdr->eh_frame_ptr_enc,
|
|
base_from_cb_data (hdr->eh_frame_ptr_enc,
|
|
data),
|
|
(const unsigned char *) (hdr + 1),
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
&eh_frame
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
&eh_frame_off
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
);
|
|
|
|
#if defined (__e2k__) && defined (__ptr128__)
|
|
eh_frame = (void *) &info->dlpi_gd[eh_frame_off - (_Unwind_Ptr) info->dlpi_gd];
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
|
|
|
|
|
|
/* We require here specific table encoding to speed things up.
|
|
Also, DW_EH_PE_datarel here means using PT_GNU_EH_FRAME start
|
|
as base, not the processor specific DW_EH_PE_datarel. */
|
|
if (hdr->fde_count_enc != DW_EH_PE_omit
|
|
&& hdr->table_enc == (DW_EH_PE_datarel | DW_EH_PE_sdata4))
|
|
{
|
|
_Unwind_Ptr fde_count;
|
|
|
|
p = read_encoded_value_with_base (hdr->fde_count_enc,
|
|
base_from_cb_data (hdr->fde_count_enc,
|
|
data),
|
|
p, &fde_count);
|
|
/* Shouldn't happen. */
|
|
if (fde_count == 0)
|
|
return 1;
|
|
if ((((_Unwind_Ptr) p) & 3) == 0)
|
|
{
|
|
struct fde_table {
|
|
signed initial_loc __attribute__ ((mode (SI)));
|
|
signed fde __attribute__ ((mode (SI)));
|
|
};
|
|
const struct fde_table *table = (const struct fde_table *) p;
|
|
size_t lo, hi, mid;
|
|
_Unwind_Ptr data_base = (_Unwind_Ptr) hdr;
|
|
fde *f;
|
|
unsigned int f_enc, f_enc_size;
|
|
_Unwind_Ptr range;
|
|
|
|
#if defined (__e2k__) && defined (__ptr128__)
|
|
/* This rather strangely named variable is used by them both to
|
|
evaluate runtime PCs based on the values encoded in the `table[]'
|
|
and the pointer to the resulting FDE. In PM it's used only for the
|
|
former goal, whereas FDE is obtained via the offset from the start
|
|
of `.eh_frame_hdr' pointed to by `hdr' without this idiotic
|
|
intermediate cast to `_Unwind_Ptr'. */
|
|
data_base += text_base - (_Unwind_Ptr) gd;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
|
|
mid = fde_count - 1;
|
|
if (data->pc < table[0].initial_loc + data_base)
|
|
return 1;
|
|
else if (data->pc < table[mid].initial_loc + data_base)
|
|
{
|
|
lo = 0;
|
|
hi = mid;
|
|
|
|
while (lo < hi)
|
|
{
|
|
mid = (lo + hi) / 2;
|
|
if (data->pc < table[mid].initial_loc + data_base)
|
|
hi = mid;
|
|
else if (data->pc >= table[mid + 1].initial_loc + data_base)
|
|
lo = mid + 1;
|
|
else
|
|
break;
|
|
}
|
|
|
|
gcc_assert (lo < hi);
|
|
}
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
f = (fde *) (table[mid].fde + data_base);
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
f = (fde *) &((char *) hdr)[table[mid].fde];
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
f_enc = get_fde_encoding (f);
|
|
f_enc_size = size_of_encoded_value (f_enc);
|
|
read_encoded_value_with_base (f_enc & 0x0f, 0,
|
|
&f->pc_begin[f_enc_size], &range);
|
|
if (data->pc < table[mid].initial_loc + data_base + range)
|
|
data->ret = f;
|
|
data->func = (void *) (table[mid].initial_loc + data_base);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* We have no sorted search table, so need to go the slow way.
|
|
As soon as GLIBC will provide API so to notify that a library has been
|
|
removed, we could cache this (and thus use search_object). */
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
ob.pc_begin = NULL;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
ob.pc_begin = 0;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
ob.tbase = data->tbase;
|
|
ob.dbase = data->dbase;
|
|
ob.u.single = (fde *) eh_frame;
|
|
ob.s.i = 0;
|
|
ob.s.b.mixed_encoding = 1; /* Need to assume worst case. */
|
|
data->ret = linear_search_fdes (&ob, (fde *) eh_frame,
|
|
#if !(defined (__e2k__) && defined (__ptr128__))
|
|
(void *)
|
|
#endif /* !(defined (__e2k__) && defined (__ptr128__)) */
|
|
data->pc);
|
|
if (data->ret != NULL)
|
|
{
|
|
_Unwind_Ptr func;
|
|
unsigned int encoding = get_fde_encoding (data->ret);
|
|
|
|
read_encoded_value_with_base (encoding,
|
|
base_from_cb_data (encoding, data),
|
|
data->ret->pc_begin, &func);
|
|
data->func = (void *) func;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
const fde *
|
|
_Unwind_Find_FDE (
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
void *pc,
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
_Unwind_Ptr pc,
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
struct dwarf_eh_bases *bases)
|
|
{
|
|
struct unw_eh_callback_data data;
|
|
const fde *ret;
|
|
|
|
ret = _Unwind_Find_registered_FDE (pc, bases);
|
|
if (ret != NULL)
|
|
return ret;
|
|
|
|
data.pc = (_Unwind_Ptr) pc;
|
|
#if ! (defined (__e2k__) && defined (__ptr128__))
|
|
data.tbase = NULL;
|
|
data.dbase = NULL;
|
|
#else /* defined (__e2k__) && defined (__ptr128__) */
|
|
data.tbase = 0;
|
|
data.dbase = 0;
|
|
#endif /* defined (__e2k__) && defined (__ptr128__) */
|
|
data.func = NULL;
|
|
data.ret = NULL;
|
|
data.check_cache = 1;
|
|
|
|
if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
|
|
return NULL;
|
|
|
|
if (data.ret)
|
|
{
|
|
bases->tbase = data.tbase;
|
|
bases->dbase = data.dbase;
|
|
bases->func = data.func;
|
|
}
|
|
return data.ret;
|
|
}
|
|
|
|
#else
|
|
/* Prevent multiple include of header files. */
|
|
#define _Unwind_Find_FDE _Unwind_Find_FDE
|
|
#include "unwind-dw2-fde.c"
|
|
#endif
|
|
|
|
#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
|
|
alias (_Unwind_Find_FDE);
|
|
#endif
|