diff options
Diffstat (limited to 'sysdeps/generic/unwind-dw2-fde-glibc.c')
| -rw-r--r-- | sysdeps/generic/unwind-dw2-fde-glibc.c | 279 |
1 files changed, 0 insertions, 279 deletions
diff --git a/sysdeps/generic/unwind-dw2-fde-glibc.c b/sysdeps/generic/unwind-dw2-fde-glibc.c deleted file mode 100644 index 9d698d575b..0000000000 --- a/sysdeps/generic/unwind-dw2-fde-glibc.c +++ /dev/null @@ -1,279 +0,0 @@ -/* Copyright (C) 2001-2017 Free Software Foundation, Inc. - Contributed by Jakub Jelinek <jakub@redhat.com>. - - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; 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. */ - -#ifdef _LIBC -# include <shlib-compat.h> -#endif - -#if !defined _LIBC || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2_5) - -#include <link.h> -#include <stddef.h> - -#define _Unwind_Find_FDE _Unwind_Find_registered_FDE - -#include <unwind-dw2-fde.c> - -#undef _Unwind_Find_FDE - -extern fde * _Unwind_Find_registered_FDE (void *pc, - struct dwarf_eh_bases *bases); -extern fde * _Unwind_Find_FDE (void *, struct dwarf_eh_bases *); - -struct unw_eh_callback_data -{ - _Unwind_Ptr pc; - void *tbase; - void *dbase; - void *func; - fde *ret; -}; - -struct unw_eh_frame_hdr -{ - unsigned char version; - unsigned char eh_frame_ptr_enc; - unsigned char fde_count_enc; - unsigned char table_enc; -}; - -/* Like base_of_encoded_value, but take the base from a struct object - 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; - } - abort (); -} - -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, *p_eh_frame_hdr; - const ElfW(Phdr) *p_dynamic __attribute__ ((unused)); - long n, match; - _Unwind_Ptr load_base; - const unsigned char *p; - const struct unw_eh_frame_hdr *hdr; - _Unwind_Ptr eh_frame; - struct object ob; - - /* 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_eh_frame_hdr = NULL; - p_dynamic = NULL; - - /* 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) - { - _Unwind_Ptr vaddr = phdr->p_vaddr + load_base; - if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz) - match = 1; - } - else if (phdr->p_type == PT_GNU_EH_FRAME) - p_eh_frame_hdr = phdr; - else if (phdr->p_type == PT_DYNAMIC) - p_dynamic = phdr; - } - if (!match || !p_eh_frame_hdr) - return 0; - - /* Read .eh_frame_hdr header. */ - hdr = (const struct unw_eh_frame_hdr *) - (p_eh_frame_hdr->p_vaddr + load_base); - if (hdr->version != 1) - return 1; - -#ifdef CRT_GET_RFIB_DATA -# ifdef __i386__ - data->dbase = NULL; - if (p_dynamic) - { - /* For dynamicly linked executables and shared libraries, - DT_PLTGOT is the gp value for that object. */ - ElfW(Dyn) *dyn = (ElfW(Dyn) *)(p_dynamic->p_vaddr + load_base); - for (; dyn->d_tag != DT_NULL ; dyn++) - if (dyn->d_tag == DT_PLTGOT) - { - /* On IA-32, _DYNAMIC is writable and GLIBC has relocated it. */ - data->dbase = (void *) dyn->d_un.d_ptr; - break; - } - } -# else -# error What is DW_EH_PE_datarel base on this platform? -# endif -#endif -#ifdef CRT_GET_RFIB_TEXT -# error What is DW_EH_PE_textrel base on this platform? -#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), - &eh_frame); - - /* 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; - - 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; - } - - if (lo >= hi) - __gxx_abort (); - } - - f = (fde *) (table[mid].fde + data_base); - 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). */ - ob.pc_begin = NULL; - 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, (void *) data->pc); - if (data->ret != NULL) - { - unsigned int encoding = get_fde_encoding (data->ret); - _Unwind_Ptr func; - read_encoded_value_with_base (encoding, - base_from_cb_data (encoding, data), - data->ret->pc_begin, &func); - data->func = (void *) func; - } - return 1; -} - -# ifdef _LIBC -# define dl_iterate_phdr __dl_iterate_phdr -# endif - -fde * -_Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases) -{ - struct unw_eh_callback_data data; - fde *ret; - - ret = _Unwind_Find_registered_FDE (pc, bases); - if (ret != NULL) - return ret; - - data.pc = (_Unwind_Ptr) pc; - data.tbase = NULL; - data.dbase = NULL; - data.func = NULL; - data.ret = NULL; - - 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; -} - -#endif |