mirror of
https://sourceware.org/git/glibc.git
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Update.
2002-01-03 Jakub Jelinek <jakub@redhat.com> * elf/Makefile (routines, shared-only-routines): Add unwind-dw2-fde-glibc instead of unwind-dw2-fde. * elf/elf.h (PT_GNU_EH_FRAME): Define. * sysdeps/generic/unwind-dw2-fde-glibc.c: New file. * sysdeps/generic/unwind-dw2-fde.c (__register_frame_info_bases): Optimize if .eh_frame section contains no FDEs. (__register_frame, __deregister_frame_info_bases, __deregister_frame): Likewise. * sysdeps/generic/unwind-dw2.c (execute_cfa_program): Fix DW_CFA_restore handling. 2002-01-07 Stephen L Moshier <moshier@mediaone.net>
This commit is contained in:
Ulrich Drepper
parent
abd336891b
commit
a0dcb6896c
15
ChangeLog
15
ChangeLog
@ -1,4 +1,17 @@
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2002-01-07 Stephen L Moshier <moshier@mediaone.net>
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2002-01-03 Jakub Jelinek <jakub@redhat.com>
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* elf/Makefile (routines, shared-only-routines): Add
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unwind-dw2-fde-glibc instead of unwind-dw2-fde.
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* elf/elf.h (PT_GNU_EH_FRAME): Define.
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* sysdeps/generic/unwind-dw2-fde-glibc.c: New file.
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* sysdeps/generic/unwind-dw2-fde.c (__register_frame_info_bases):
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Optimize if .eh_frame section contains no FDEs.
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(__register_frame, __deregister_frame_info_bases,
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__deregister_frame): Likewise.
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* sysdeps/generic/unwind-dw2.c (execute_cfa_program): Fix
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DW_CFA_restore handling.
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2002-01-07 Stephen L Moshier <moshier@mediaone.net>
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* sysdeps/ieee754/ldbl-96/s_erfl.c (erfcl): Fix K&R header.
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@ -67,8 +67,8 @@ distribute := $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
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include ../Makeconfig
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ifeq ($(unwind-find-fde),yes)
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routines += unwind-dw2-fde
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shared-only-routines = unwind-dw2-fde
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routines += unwind-dw2-fde-glibc
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shared-only-routines = unwind-dw2-fde-glibc
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endif
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before-compile = $(objpfx)trusted-dirs.h
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@ -561,6 +561,7 @@ typedef struct
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#define PT_TLS 7 /* Thread-local storage segment */
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#define PT_NUM 8 /* Number of defined types */
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#define PT_LOOS 0x60000000 /* Start of OS-specific */
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#define PT_GNU_EH_FRAME 0x6474e550 /* GCC .eh_frame_hdr segment */
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#define PT_LOSUNW 0x6ffffffa
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#define PT_SUNWBSS 0x6ffffffa /* Sun Specific segment */
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#define PT_SUNWSTACK 0x6ffffffb /* Stack segment */
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279
sysdeps/generic/unwind-dw2-fde-glibc.c
Normal file
279
sysdeps/generic/unwind-dw2-fde-glibc.c
Normal file
@ -0,0 +1,279 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* Locate the FDE entry for a given address, using PT_GNU_EH_FRAME ELF
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segment and dl_iterate_phdr to avoid register/deregister calls at
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DSO load/unload. */
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#ifdef _LIBC
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# include <shlib-compat.h>
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#endif
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#if !defined _LIBC || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2_5)
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#include <link.h>
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#include <stddef.h>
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#define _Unwind_Find_FDE _Unwind_Find_registered_FDE
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#include <unwind-dw2-fde.c>
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#undef _Unwind_Find_FDE
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fde * _Unwind_Find_registered_FDE (void *pc, struct dwarf_eh_bases *bases);
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struct unw_eh_callback_data
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{
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_Unwind_Ptr pc;
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void *tbase;
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void *dbase;
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void *func;
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fde *ret;
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};
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struct unw_eh_frame_hdr
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{
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unsigned char version;
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unsigned char eh_frame_ptr_enc;
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unsigned char fde_count_enc;
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unsigned char table_enc;
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};
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/* Like base_of_encoded_value, but take the base from a struct object
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instead of an _Unwind_Context. */
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static _Unwind_Ptr
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base_from_cb_data (unsigned char encoding, struct unw_eh_callback_data *data)
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{
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if (encoding == DW_EH_PE_omit)
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return 0;
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switch (encoding & 0x70)
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{
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case DW_EH_PE_absptr:
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case DW_EH_PE_pcrel:
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case DW_EH_PE_aligned:
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return 0;
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case DW_EH_PE_textrel:
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return (_Unwind_Ptr) data->tbase;
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case DW_EH_PE_datarel:
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return (_Unwind_Ptr) data->dbase;
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}
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abort ();
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}
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static int
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_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
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{
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struct unw_eh_callback_data *data = (struct unw_eh_callback_data *) ptr;
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const ElfW(Phdr) *phdr, *p_eh_frame_hdr, *p_dynamic;
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long n, match;
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_Unwind_Ptr load_base;
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const unsigned char *p;
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const struct unw_eh_frame_hdr *hdr;
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_Unwind_Ptr eh_frame;
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struct object ob;
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/* Make sure struct dl_phdr_info is at least as big as we need. */
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if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
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+ sizeof (info->dlpi_phnum))
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return -1;
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match = 0;
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phdr = info->dlpi_phdr;
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load_base = info->dlpi_addr;
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p_eh_frame_hdr = NULL;
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p_dynamic = NULL;
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/* See if PC falls into one of the loaded segments. Find the eh_frame
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segment at the same time. */
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for (n = info->dlpi_phnum; --n >= 0; phdr++)
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{
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if (phdr->p_type == PT_LOAD)
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{
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_Unwind_Ptr vaddr = phdr->p_vaddr + load_base;
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if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
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match = 1;
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}
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else if (phdr->p_type == PT_GNU_EH_FRAME)
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p_eh_frame_hdr = phdr;
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else if (phdr->p_type == PT_DYNAMIC)
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p_dynamic = phdr;
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}
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if (!match || !p_eh_frame_hdr)
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return 0;
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/* Read .eh_frame_hdr header. */
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hdr = (const struct unw_eh_frame_hdr *)
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(p_eh_frame_hdr->p_vaddr + load_base);
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if (hdr->version != 1)
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return 1;
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#ifdef CRT_GET_RFIB_DATA
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# ifdef __i386__
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data->dbase = NULL;
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if (p_dynamic)
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{
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/* For dynamicly linked executables and shared libraries,
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DT_PLTGOT is the gp value for that object. */
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ElfW(Dyn) *dyn = (ElfW(Dyn) *)(p_dynamic->p_vaddr + load_base);
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for (; dyn->d_tag != DT_NULL ; dyn++)
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if (dyn->d_tag == DT_PLTGOT)
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{
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/* On IA-32, _DYNAMIC is writable and GLIBC has relocated it. */
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data->dbase = (void *) dyn->d_un.d_ptr;
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break;
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}
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}
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# else
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# error What is DW_EH_PE_datarel base on this platform?
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# endif
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#endif
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#ifdef CRT_GET_RFIB_TEXT
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# error What is DW_EH_PE_textrel base on this platform?
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#endif
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p = read_encoded_value_with_base (hdr->eh_frame_ptr_enc,
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base_from_cb_data (hdr->eh_frame_ptr_enc,
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data),
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(const unsigned char *) (hdr + 1),
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&eh_frame);
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/* We require here specific table encoding to speed things up.
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Also, DW_EH_PE_datarel here means using PT_GNU_EH_FRAME start
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as base, not the processor specific DW_EH_PE_datarel. */
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if (hdr->fde_count_enc != DW_EH_PE_omit
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&& hdr->table_enc == (DW_EH_PE_datarel | DW_EH_PE_sdata4))
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{
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_Unwind_Ptr fde_count;
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p = read_encoded_value_with_base (hdr->fde_count_enc,
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base_from_cb_data (hdr->fde_count_enc,
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data),
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p, &fde_count);
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/* Shouldn't happen. */
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if (fde_count == 0)
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return 1;
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if ((((_Unwind_Ptr) p) & 3) == 0)
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{
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struct fde_table {
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signed initial_loc __attribute__ ((mode (SI)));
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signed fde __attribute__ ((mode (SI)));
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};
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const struct fde_table *table = (const struct fde_table *) p;
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size_t lo, hi, mid;
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_Unwind_Ptr data_base = (_Unwind_Ptr) hdr;
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fde *f;
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unsigned int f_enc, f_enc_size;
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_Unwind_Ptr range;
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mid = fde_count - 1;
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if (data->pc < table[0].initial_loc + data_base)
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return 1;
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else if (data->pc < table[mid].initial_loc + data_base)
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{
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lo = 0;
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hi = mid;
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while (lo < hi)
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{
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mid = (lo + hi) / 2;
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if (data->pc < table[mid].initial_loc + data_base)
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hi = mid;
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else if (data->pc >= table[mid + 1].initial_loc + data_base)
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lo = mid + 1;
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else
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break;
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}
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if (lo >= hi)
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__gxx_abort ();
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}
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f = (fde *) (table[mid].fde + data_base);
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f_enc = get_fde_encoding (f);
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f_enc_size = size_of_encoded_value (f_enc);
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read_encoded_value_with_base (f_enc & 0x0f, 0,
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&f->pc_begin[f_enc_size], &range);
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if (data->pc < table[mid].initial_loc + data_base + range)
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data->ret = f;
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data->func = (void *) (table[mid].initial_loc + data_base);
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return 1;
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}
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}
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/* We have no sorted search table, so need to go the slow way.
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As soon as GLIBC will provide API so to notify that a library has been
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removed, we could cache this (and thus use search_object). */
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ob.pc_begin = NULL;
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ob.tbase = data->tbase;
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ob.dbase = data->dbase;
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ob.u.single = (fde *) eh_frame;
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ob.s.i = 0;
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ob.s.b.mixed_encoding = 1; /* Need to assume worst case. */
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data->ret = linear_search_fdes (&ob, (fde *) eh_frame, (void *) data->pc);
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if (data->ret != NULL)
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{
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unsigned int encoding = get_fde_encoding (data->ret);
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read_encoded_value_with_base (encoding,
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base_from_cb_data (encoding, data),
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data->ret->pc_begin,
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(_Unwind_Ptr *)&data->func);
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}
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return 1;
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}
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fde *
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_Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
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{
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struct unw_eh_callback_data data;
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fde *ret;
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ret = _Unwind_Find_registered_FDE (pc, bases);
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if (ret != NULL)
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return ret;
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data.pc = (_Unwind_Ptr) pc;
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data.tbase = NULL;
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data.dbase = NULL;
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data.func = NULL;
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data.ret = NULL;
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if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
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return NULL;
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if (data.ret)
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{
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bases->tbase = data.tbase;
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bases->dbase = data.dbase;
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bases->func = data.func;
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}
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return data.ret;
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}
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#endif
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@ -101,6 +101,10 @@ void
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__register_frame_info_bases (void *begin, struct object *ob,
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void *tbase, void *dbase)
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{
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/* If .eh_frame is empty, don't register at all. */
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if (*(uword *)begin == 0)
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return;
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ob->pc_begin = (void *)-1;
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ob->tbase = tbase;
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ob->dbase = dbase;
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@ -126,7 +130,13 @@ __register_frame_info (void *begin, struct object *ob)
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void
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__register_frame (void *begin)
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{
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struct object *ob = (struct object *) malloc (sizeof (struct object));
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struct object *ob;
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/* If .eh_frame is empty, don't register at all. */
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if (*(uword *)begin == 0)
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return;
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ob = (struct object *) malloc (sizeof (struct object));
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__register_frame_info (begin, ob);
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}
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@ -186,6 +196,10 @@ __deregister_frame_info_bases (void *begin)
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struct object **p;
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struct object *ob = 0;
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/* If .eh_frame is empty, we haven't registered. */
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if (*(uword *)begin == 0)
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return ob;
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init_object_mutex_once ();
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__gthread_mutex_lock (&object_mutex);
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@ -235,7 +249,9 @@ __deregister_frame_info (void *begin)
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void
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__deregister_frame (void *begin)
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{
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free (__deregister_frame_info (begin));
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/* If .eh_frame is empty, we haven't registered. */
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if (*(uword *)begin != 0)
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free (__deregister_frame_info (begin));
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}
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@ -968,7 +984,7 @@ _Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
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__gthread_mutex_lock (&object_mutex);
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/* Linear search through the classified objects, to find the one
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containing the pc. Note that pc_begin is sorted decending, and
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containing the pc. Note that pc_begin is sorted descending, and
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we expect objects to be non-overlapping. */
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for (ob = seen_objects; ob; ob = ob->next)
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if (pc >= ob->pc_begin)
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@ -721,9 +721,9 @@ execute_cfa_program (const unsigned char *insn_ptr,
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_Unwind_Sword offset;
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_Unwind_Ptr ptrtmp;
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if (insn & DW_CFA_advance_loc)
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if ((insn & 0xc0) == DW_CFA_advance_loc)
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fs->pc += (insn & 0x3f) * fs->code_align;
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else if (insn & DW_CFA_offset)
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else if ((insn & 0xc0) == DW_CFA_offset)
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{
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reg = insn & 0x3f;
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insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
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@ -731,7 +731,7 @@ execute_cfa_program (const unsigned char *insn_ptr,
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fs->regs.reg[reg].how = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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else if (insn & DW_CFA_restore)
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else if ((insn & 0xc0) == DW_CFA_restore)
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{
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reg = insn & 0x3f;
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fs->regs.reg[reg].how = REG_UNSAVED;
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