/* Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
|
/* Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
|
Contributed by Richard Henderson <rth@cygnus.com>.
|
Contributed by Richard Henderson <rth@cygnus.com>.
|
|
|
This file is part of GCC.
|
This file is part of GCC.
|
|
|
GCC is free software; you can redistribute it and/or modify
|
GCC is free software; you can redistribute it and/or modify
|
it under the terms of the GNU General Public License as published by
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 2, or (at your option)
|
the Free Software Foundation; either version 2, or (at your option)
|
any later version.
|
any later version.
|
|
|
GCC is distributed in the hope that it will be useful,
|
GCC is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with GCC; see the file COPYING. If not, write to
|
along with GCC; see the file COPYING. If not, write to
|
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
Boston, MA 02110-1301, USA. */
|
Boston, MA 02110-1301, USA. */
|
|
|
/* As a special exception, if you link this library with other files,
|
/* As a special exception, if you link this library with other files,
|
some of which are compiled with GCC, to produce an executable,
|
some of which are compiled with GCC, to produce an executable,
|
this library does not by itself cause the resulting executable
|
this library does not by itself cause the resulting executable
|
to be covered by the GNU General Public License.
|
to be covered by the GNU General Public License.
|
This exception does not however invalidate any other reasons why
|
This exception does not however invalidate any other reasons why
|
the executable file might be covered by the GNU General Public License. */
|
the executable file might be covered by the GNU General Public License. */
|
|
|
/* Locate the FDE entry for a given address, using glibc ld.so routines
|
/* Locate the FDE entry for a given address, using glibc ld.so routines
|
to avoid register/deregister calls at DSO load/unload. */
|
to avoid register/deregister calls at DSO load/unload. */
|
|
|
#ifndef _GNU_SOURCE
|
#ifndef _GNU_SOURCE
|
#define _GNU_SOURCE 1
|
#define _GNU_SOURCE 1
|
#endif
|
#endif
|
#include "config.h"
|
#include "config.h"
|
#include <stddef.h>
|
#include <stddef.h>
|
#include <stdlib.h>
|
#include <stdlib.h>
|
#include <link.h>
|
#include <link.h>
|
#include "unwind-ia64.h"
|
#include "unwind-ia64.h"
|
|
|
#if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 2) \
|
#if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 2) \
|
|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && !defined(DT_CONFIG))
|
|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && !defined(DT_CONFIG))
|
# error You need GLIBC 2.2.4 or later on IA-64 Linux
|
# error You need GLIBC 2.2.4 or later on IA-64 Linux
|
#endif
|
#endif
|
|
|
struct unw_ia64_callback_data
|
struct unw_ia64_callback_data
|
{
|
{
|
Elf64_Addr pc;
|
Elf64_Addr pc;
|
unsigned long *segment_base;
|
unsigned long *segment_base;
|
unsigned long *gp;
|
unsigned long *gp;
|
struct unw_table_entry *ret;
|
struct unw_table_entry *ret;
|
};
|
};
|
|
|
static int
|
static int
|
_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
|
_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
|
{
|
{
|
struct unw_ia64_callback_data *data = (struct unw_ia64_callback_data *) ptr;
|
struct unw_ia64_callback_data *data = (struct unw_ia64_callback_data *) ptr;
|
const Elf64_Phdr *phdr, *p_unwind, *p_dynamic;
|
const Elf64_Phdr *phdr, *p_unwind, *p_dynamic;
|
long n, match;
|
long n, match;
|
Elf64_Addr load_base, seg_base;
|
Elf64_Addr load_base, seg_base;
|
struct unw_table_entry *f_base, *f;
|
struct unw_table_entry *f_base, *f;
|
size_t lo, hi;
|
size_t lo, hi;
|
|
|
/* Make sure struct dl_phdr_info is at least as big as we need. */
|
/* Make sure struct dl_phdr_info is at least as big as we need. */
|
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
|
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
|
+ sizeof (info->dlpi_phnum))
|
+ sizeof (info->dlpi_phnum))
|
return -1;
|
return -1;
|
|
|
match = 0;
|
match = 0;
|
phdr = info->dlpi_phdr;
|
phdr = info->dlpi_phdr;
|
load_base = info->dlpi_addr;
|
load_base = info->dlpi_addr;
|
p_unwind = NULL;
|
p_unwind = NULL;
|
p_dynamic = NULL;
|
p_dynamic = NULL;
|
seg_base = ~(Elf64_Addr) 0;
|
seg_base = ~(Elf64_Addr) 0;
|
|
|
/* See if PC falls into one of the loaded segments. Find the unwind
|
/* See if PC falls into one of the loaded segments. Find the unwind
|
segment at the same time. */
|
segment at the same time. */
|
for (n = info->dlpi_phnum; --n >= 0; phdr++)
|
for (n = info->dlpi_phnum; --n >= 0; phdr++)
|
{
|
{
|
if (phdr->p_type == PT_LOAD)
|
if (phdr->p_type == PT_LOAD)
|
{
|
{
|
Elf64_Addr vaddr = phdr->p_vaddr + load_base;
|
Elf64_Addr vaddr = phdr->p_vaddr + load_base;
|
if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
|
if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
|
match = 1;
|
match = 1;
|
if (vaddr < seg_base)
|
if (vaddr < seg_base)
|
seg_base = vaddr;
|
seg_base = vaddr;
|
}
|
}
|
else if (phdr->p_type == PT_IA_64_UNWIND)
|
else if (phdr->p_type == PT_IA_64_UNWIND)
|
p_unwind = phdr;
|
p_unwind = phdr;
|
else if (phdr->p_type == PT_DYNAMIC)
|
else if (phdr->p_type == PT_DYNAMIC)
|
p_dynamic = phdr;
|
p_dynamic = phdr;
|
}
|
}
|
if (!match || !p_unwind)
|
if (!match || !p_unwind)
|
return 0;
|
return 0;
|
|
|
/* Search for the FDE within the unwind segment. */
|
/* Search for the FDE within the unwind segment. */
|
|
|
f_base = (struct unw_table_entry *) (p_unwind->p_vaddr + load_base);
|
f_base = (struct unw_table_entry *) (p_unwind->p_vaddr + load_base);
|
lo = 0;
|
lo = 0;
|
hi = p_unwind->p_memsz / sizeof (struct unw_table_entry);
|
hi = p_unwind->p_memsz / sizeof (struct unw_table_entry);
|
|
|
while (lo < hi)
|
while (lo < hi)
|
{
|
{
|
size_t mid = (lo + hi) / 2;
|
size_t mid = (lo + hi) / 2;
|
|
|
f = f_base + mid;
|
f = f_base + mid;
|
if (data->pc < f->start_offset + seg_base)
|
if (data->pc < f->start_offset + seg_base)
|
hi = mid;
|
hi = mid;
|
else if (data->pc >= f->end_offset + seg_base)
|
else if (data->pc >= f->end_offset + seg_base)
|
lo = mid + 1;
|
lo = mid + 1;
|
else
|
else
|
goto found;
|
goto found;
|
}
|
}
|
/* No need to search for further libraries when we know pc is contained
|
/* No need to search for further libraries when we know pc is contained
|
in this library. */
|
in this library. */
|
return 1;
|
return 1;
|
|
|
found:
|
found:
|
*data->segment_base = seg_base;
|
*data->segment_base = seg_base;
|
*data->gp = 0;
|
*data->gp = 0;
|
data->ret = f;
|
data->ret = f;
|
|
|
if (p_dynamic)
|
if (p_dynamic)
|
{
|
{
|
/* For dynamically linked executables and shared libraries,
|
/* For dynamically linked executables and shared libraries,
|
DT_PLTGOT is the gp value for that object. */
|
DT_PLTGOT is the gp value for that object. */
|
Elf64_Dyn *dyn = (Elf64_Dyn *)(p_dynamic->p_vaddr + load_base);
|
Elf64_Dyn *dyn = (Elf64_Dyn *)(p_dynamic->p_vaddr + load_base);
|
for (; dyn->d_tag != DT_NULL ; dyn++)
|
for (; dyn->d_tag != DT_NULL ; dyn++)
|
if (dyn->d_tag == DT_PLTGOT)
|
if (dyn->d_tag == DT_PLTGOT)
|
{
|
{
|
/* On IA-64, _DYNAMIC is writable and GLIBC has relocated it. */
|
/* On IA-64, _DYNAMIC is writable and GLIBC has relocated it. */
|
*data->gp = dyn->d_un.d_ptr;
|
*data->gp = dyn->d_un.d_ptr;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Otherwise this is a static executable with no _DYNAMIC.
|
/* Otherwise this is a static executable with no _DYNAMIC.
|
The gp is constant program-wide. */
|
The gp is constant program-wide. */
|
register unsigned long gp __asm__("gp");
|
register unsigned long gp __asm__("gp");
|
*data->gp = gp;
|
*data->gp = gp;
|
}
|
}
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Return a pointer to the unwind table entry for the function
|
/* Return a pointer to the unwind table entry for the function
|
containing PC. */
|
containing PC. */
|
|
|
struct unw_table_entry *
|
struct unw_table_entry *
|
_Unwind_FindTableEntry (void *pc, unsigned long *segment_base,
|
_Unwind_FindTableEntry (void *pc, unsigned long *segment_base,
|
unsigned long *gp)
|
unsigned long *gp)
|
{
|
{
|
struct unw_ia64_callback_data data;
|
struct unw_ia64_callback_data data;
|
|
|
data.pc = (Elf64_Addr) pc;
|
data.pc = (Elf64_Addr) pc;
|
data.segment_base = segment_base;
|
data.segment_base = segment_base;
|
data.gp = gp;
|
data.gp = gp;
|
data.ret = NULL;
|
data.ret = NULL;
|
|
|
if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
|
if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
|
return NULL;
|
return NULL;
|
|
|
return data.ret;
|
return data.ret;
|
}
|
}
|
|
|
