diff options
Diffstat (limited to 'gcc-4.9/libgcc/config/ia64/fde-glibc.c')
| -rw-r--r-- | gcc-4.9/libgcc/config/ia64/fde-glibc.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/ia64/fde-glibc.c b/gcc-4.9/libgcc/config/ia64/fde-glibc.c new file mode 100644 index 000000000..8643b86ba --- /dev/null +++ b/gcc-4.9/libgcc/config/ia64/fde-glibc.c @@ -0,0 +1,161 @@ +/* Copyright (C) 2000-2014 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@cygnus.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 glibc ld.so routines + to avoid register/deregister calls at DSO load/unload. */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE 1 +#endif +#include "config.h" +#include <stddef.h> +#include <stdlib.h> +#include <link.h> +#include "unwind-ia64.h" + +#if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 2) \ + || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && !defined(DT_CONFIG)) +# error You need GLIBC 2.2.4 or later on IA-64 Linux +#endif + +struct unw_ia64_callback_data +{ + Elf64_Addr pc; + unsigned long *segment_base; + unsigned long *gp; + struct unw_table_entry *ret; +}; + +static int +_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr) +{ + struct unw_ia64_callback_data *data = (struct unw_ia64_callback_data *) ptr; + const Elf64_Phdr *phdr, *p_unwind, *p_dynamic; + long n, match; + Elf64_Addr load_base, seg_base; + struct unw_table_entry *f_base, *f; + size_t lo, hi; + + /* 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; + + match = 0; + phdr = info->dlpi_phdr; + load_base = info->dlpi_addr; + p_unwind = NULL; + p_dynamic = NULL; + seg_base = ~(Elf64_Addr) 0; + + /* See if PC falls into one of the loaded segments. Find the unwind + segment at the same time. */ + for (n = info->dlpi_phnum; --n >= 0; phdr++) + { + if (phdr->p_type == PT_LOAD) + { + Elf64_Addr vaddr = phdr->p_vaddr + load_base; + if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz) + match = 1; + if (vaddr < seg_base) + seg_base = vaddr; + } + else if (phdr->p_type == PT_IA_64_UNWIND) + p_unwind = phdr; + else if (phdr->p_type == PT_DYNAMIC) + p_dynamic = phdr; + } + if (!match || !p_unwind) + return 0; + + /* Search for the FDE within the unwind segment. */ + + f_base = (struct unw_table_entry *) (p_unwind->p_vaddr + load_base); + lo = 0; + hi = p_unwind->p_memsz / sizeof (struct unw_table_entry); + + while (lo < hi) + { + size_t mid = (lo + hi) / 2; + + f = f_base + mid; + if (data->pc < f->start_offset + seg_base) + hi = mid; + else if (data->pc >= f->end_offset + seg_base) + lo = mid + 1; + else + goto found; + } + /* No need to search for further libraries when we know pc is contained + in this library. */ + return 1; + + found: + *data->segment_base = seg_base; + *data->gp = 0; + data->ret = f; + + if (p_dynamic) + { + /* For dynamically linked executables and shared libraries, + DT_PLTGOT is the gp value for that object. */ + Elf64_Dyn *dyn = (Elf64_Dyn *)(p_dynamic->p_vaddr + load_base); + for (; dyn->d_tag != DT_NULL ; dyn++) + if (dyn->d_tag == DT_PLTGOT) + { + /* On IA-64, _DYNAMIC is writable and GLIBC has relocated it. */ + *data->gp = dyn->d_un.d_ptr; + break; + } + } + else + { + /* Otherwise this is a static executable with no _DYNAMIC. + The gp is constant program-wide. */ + register unsigned long gp __asm__("gp"); + *data->gp = gp; + } + + return 1; +} + +/* Return a pointer to the unwind table entry for the function + containing PC. */ + +struct unw_table_entry * +_Unwind_FindTableEntry (void *pc, unw_word *segment_base, unw_word *gp, + struct unw_table_entry *ent ATTRIBUTE_UNUSED) +{ + struct unw_ia64_callback_data data; + + data.pc = (Elf64_Addr) pc; + data.segment_base = segment_base; + data.gp = gp; + data.ret = NULL; + + if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0) + return NULL; + + return data.ret; +} |