1 |
38 |
julius |
/* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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2 |
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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4 |
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This file is part of GCC.
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5 |
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6 |
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GCC is free software; you can redistribute it and/or modify
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7 |
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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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9 |
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any later version.
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11 |
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GCC 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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16 |
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You should have received a copy of the GNU General Public License
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17 |
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along with GCC; see the file COPYING. If not, write to
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18 |
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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19 |
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Boston, MA 02110-1301, USA. */
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20 |
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21 |
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/* As a special exception, if you link this library with other files,
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22 |
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some of which are compiled with GCC, to produce an executable,
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23 |
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this library does not by itself cause the resulting executable
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24 |
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to be covered by the GNU General Public License.
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25 |
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This exception does not however invalidate any other reasons why
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26 |
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the executable file might be covered by the GNU General Public License. */
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27 |
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28 |
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/* Locate the FDE entry for a given address, using PT_GNU_EH_FRAME ELF
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29 |
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segment and dl_iterate_phdr to avoid register/deregister calls at
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30 |
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DSO load/unload. */
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31 |
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32 |
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#ifndef _GNU_SOURCE
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33 |
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#define _GNU_SOURCE 1
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34 |
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#endif
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35 |
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36 |
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#include "tconfig.h"
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37 |
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#include "tsystem.h"
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38 |
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#ifndef inhibit_libc
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39 |
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#include <link.h>
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40 |
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#endif
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41 |
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#include "coretypes.h"
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42 |
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#include "tm.h"
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43 |
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#include "dwarf2.h"
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44 |
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#include "unwind.h"
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45 |
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#define NO_BASE_OF_ENCODED_VALUE
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46 |
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|
#include "unwind-pe.h"
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47 |
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#include "unwind-dw2-fde.h"
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48 |
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#include "unwind-compat.h"
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49 |
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|
#include "gthr.h"
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50 |
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51 |
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#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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52 |
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&& (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
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53 |
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|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
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54 |
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55 |
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#ifndef __RELOC_POINTER
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56 |
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# define __RELOC_POINTER(ptr, base) ((ptr) + (base))
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57 |
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#endif
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58 |
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59 |
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static const fde * _Unwind_Find_registered_FDE (void *pc, struct dwarf_eh_bases *bases);
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60 |
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61 |
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#define _Unwind_Find_FDE _Unwind_Find_registered_FDE
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62 |
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#include "unwind-dw2-fde.c"
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63 |
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#undef _Unwind_Find_FDE
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64 |
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65 |
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#ifndef PT_GNU_EH_FRAME
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66 |
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#define PT_GNU_EH_FRAME (PT_LOOS + 0x474e550)
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67 |
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#endif
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68 |
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69 |
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struct unw_eh_callback_data
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70 |
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{
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71 |
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_Unwind_Ptr pc;
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72 |
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void *tbase;
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73 |
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void *dbase;
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74 |
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void *func;
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75 |
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const fde *ret;
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76 |
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int check_cache;
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77 |
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};
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78 |
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79 |
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struct unw_eh_frame_hdr
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80 |
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{
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81 |
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unsigned char version;
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82 |
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unsigned char eh_frame_ptr_enc;
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83 |
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unsigned char fde_count_enc;
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84 |
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unsigned char table_enc;
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85 |
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};
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86 |
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87 |
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#define FRAME_HDR_CACHE_SIZE 8
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88 |
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89 |
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static struct frame_hdr_cache_element
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90 |
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{
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91 |
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_Unwind_Ptr pc_low;
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92 |
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_Unwind_Ptr pc_high;
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93 |
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_Unwind_Ptr load_base;
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94 |
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const ElfW(Phdr) *p_eh_frame_hdr;
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95 |
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const ElfW(Phdr) *p_dynamic;
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96 |
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struct frame_hdr_cache_element *link;
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97 |
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} frame_hdr_cache[FRAME_HDR_CACHE_SIZE];
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98 |
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99 |
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static struct frame_hdr_cache_element *frame_hdr_cache_head;
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100 |
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101 |
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/* Like base_of_encoded_value, but take the base from a struct
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102 |
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unw_eh_callback_data instead of an _Unwind_Context. */
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103 |
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104 |
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static _Unwind_Ptr
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105 |
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base_from_cb_data (unsigned char encoding, struct unw_eh_callback_data *data)
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106 |
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{
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107 |
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if (encoding == DW_EH_PE_omit)
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108 |
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return 0;
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109 |
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110 |
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switch (encoding & 0x70)
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111 |
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{
|
112 |
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case DW_EH_PE_absptr:
|
113 |
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case DW_EH_PE_pcrel:
|
114 |
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case DW_EH_PE_aligned:
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115 |
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return 0;
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116 |
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117 |
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case DW_EH_PE_textrel:
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118 |
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return (_Unwind_Ptr) data->tbase;
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119 |
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case DW_EH_PE_datarel:
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120 |
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return (_Unwind_Ptr) data->dbase;
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121 |
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default:
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122 |
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|
gcc_unreachable ();
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123 |
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|
}
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124 |
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}
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125 |
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126 |
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static int
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127 |
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_Unwind_IteratePhdrCallback (struct dl_phdr_info *info, size_t size, void *ptr)
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128 |
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{
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129 |
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struct unw_eh_callback_data *data = (struct unw_eh_callback_data *) ptr;
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130 |
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const ElfW(Phdr) *phdr, *p_eh_frame_hdr, *p_dynamic;
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131 |
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long n, match;
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132 |
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#ifdef __FRV_FDPIC__
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133 |
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struct elf32_fdpic_loadaddr load_base;
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134 |
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#else
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135 |
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_Unwind_Ptr load_base;
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136 |
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|
#endif
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137 |
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const unsigned char *p;
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138 |
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|
const struct unw_eh_frame_hdr *hdr;
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139 |
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|
_Unwind_Ptr eh_frame;
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140 |
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|
struct object ob;
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141 |
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142 |
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|
struct ext_dl_phdr_info
|
143 |
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|
{
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144 |
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|
ElfW(Addr) dlpi_addr;
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145 |
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|
const char *dlpi_name;
|
146 |
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|
const ElfW(Phdr) *dlpi_phdr;
|
147 |
|
|
ElfW(Half) dlpi_phnum;
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148 |
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unsigned long long int dlpi_adds;
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149 |
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|
unsigned long long int dlpi_subs;
|
150 |
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|
};
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151 |
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152 |
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match = 0;
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153 |
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phdr = info->dlpi_phdr;
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154 |
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load_base = info->dlpi_addr;
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155 |
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p_eh_frame_hdr = NULL;
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156 |
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p_dynamic = NULL;
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157 |
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|
158 |
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struct frame_hdr_cache_element *prev_cache_entry = NULL,
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159 |
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*last_cache_entry = NULL;
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160 |
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161 |
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if (data->check_cache && size >= sizeof (struct ext_dl_phdr_info))
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162 |
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{
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163 |
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static unsigned long long adds = -1ULL, subs;
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164 |
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struct ext_dl_phdr_info *einfo = (struct ext_dl_phdr_info *) info;
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165 |
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166 |
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/* We use a least recently used cache replacement policy. Also,
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167 |
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the most recently used cache entries are placed at the head
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168 |
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of the search chain. */
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169 |
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170 |
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if (einfo->dlpi_adds == adds && einfo->dlpi_subs == subs)
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171 |
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{
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172 |
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/* Find data->pc in shared library cache.
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173 |
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Set load_base, p_eh_frame_hdr and p_dynamic
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174 |
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plus match from the cache and goto
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175 |
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"Read .eh_frame_hdr header." below. */
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176 |
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|
177 |
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struct frame_hdr_cache_element *cache_entry;
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178 |
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179 |
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for (cache_entry = frame_hdr_cache_head;
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180 |
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cache_entry;
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181 |
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cache_entry = cache_entry->link)
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182 |
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{
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183 |
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if (data->pc >= cache_entry->pc_low
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184 |
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&& data->pc < cache_entry->pc_high)
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185 |
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{
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186 |
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load_base = cache_entry->load_base;
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187 |
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p_eh_frame_hdr = cache_entry->p_eh_frame_hdr;
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188 |
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p_dynamic = cache_entry->p_dynamic;
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189 |
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190 |
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/* And move the entry we're using to the head. */
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191 |
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if (cache_entry != frame_hdr_cache_head)
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192 |
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{
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193 |
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prev_cache_entry->link = cache_entry->link;
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194 |
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cache_entry->link = frame_hdr_cache_head;
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195 |
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frame_hdr_cache_head = cache_entry;
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196 |
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}
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197 |
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goto found;
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198 |
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}
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199 |
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|
200 |
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last_cache_entry = cache_entry;
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201 |
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/* Exit early if we found an unused entry. */
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202 |
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|
if ((cache_entry->pc_low | cache_entry->pc_high) == 0)
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203 |
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break;
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204 |
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if (cache_entry->link != NULL)
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205 |
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prev_cache_entry = cache_entry;
|
206 |
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|
}
|
207 |
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}
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208 |
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else
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209 |
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{
|
210 |
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adds = einfo->dlpi_adds;
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211 |
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|
subs = einfo->dlpi_subs;
|
212 |
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|
/* Initialize the cache. Create a chain of cache entries,
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213 |
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|
with the final one terminated by a NULL link. */
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214 |
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int i;
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215 |
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for (i = 0; i < FRAME_HDR_CACHE_SIZE; i++)
|
216 |
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{
|
217 |
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frame_hdr_cache[i].pc_low = 0;
|
218 |
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frame_hdr_cache[i].pc_high = 0;
|
219 |
|
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frame_hdr_cache[i].link = &frame_hdr_cache[i+1];
|
220 |
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|
}
|
221 |
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frame_hdr_cache[i-1].link = NULL;
|
222 |
|
|
frame_hdr_cache_head = &frame_hdr_cache[0];
|
223 |
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|
data->check_cache = 0;
|
224 |
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|
}
|
225 |
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|
}
|
226 |
|
|
|
227 |
|
|
/* Make sure struct dl_phdr_info is at least as big as we need. */
|
228 |
|
|
if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
|
229 |
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+ sizeof (info->dlpi_phnum))
|
230 |
|
|
return -1;
|
231 |
|
|
|
232 |
|
|
_Unwind_Ptr pc_low = 0, pc_high = 0;
|
233 |
|
|
|
234 |
|
|
/* See if PC falls into one of the loaded segments. Find the eh_frame
|
235 |
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|
segment at the same time. */
|
236 |
|
|
for (n = info->dlpi_phnum; --n >= 0; phdr++)
|
237 |
|
|
{
|
238 |
|
|
if (phdr->p_type == PT_LOAD)
|
239 |
|
|
{
|
240 |
|
|
_Unwind_Ptr vaddr = (_Unwind_Ptr)
|
241 |
|
|
__RELOC_POINTER (phdr->p_vaddr, load_base);
|
242 |
|
|
if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
|
243 |
|
|
{
|
244 |
|
|
match = 1;
|
245 |
|
|
pc_low = vaddr;
|
246 |
|
|
pc_high = vaddr + phdr->p_memsz;
|
247 |
|
|
}
|
248 |
|
|
}
|
249 |
|
|
else if (phdr->p_type == PT_GNU_EH_FRAME)
|
250 |
|
|
p_eh_frame_hdr = phdr;
|
251 |
|
|
else if (phdr->p_type == PT_DYNAMIC)
|
252 |
|
|
p_dynamic = phdr;
|
253 |
|
|
}
|
254 |
|
|
|
255 |
|
|
if (!match)
|
256 |
|
|
return 0;
|
257 |
|
|
|
258 |
|
|
if (size >= sizeof (struct ext_dl_phdr_info))
|
259 |
|
|
{
|
260 |
|
|
/* Move the cache entry we're about to overwrite to the head of
|
261 |
|
|
the list. If either last_cache_entry or prev_cache_entry are
|
262 |
|
|
NULL, that cache entry is already at the head. */
|
263 |
|
|
if (last_cache_entry != NULL && prev_cache_entry != NULL)
|
264 |
|
|
{
|
265 |
|
|
prev_cache_entry->link = last_cache_entry->link;
|
266 |
|
|
last_cache_entry->link = frame_hdr_cache_head;
|
267 |
|
|
frame_hdr_cache_head = last_cache_entry;
|
268 |
|
|
}
|
269 |
|
|
|
270 |
|
|
frame_hdr_cache_head->load_base = load_base;
|
271 |
|
|
frame_hdr_cache_head->p_eh_frame_hdr = p_eh_frame_hdr;
|
272 |
|
|
frame_hdr_cache_head->p_dynamic = p_dynamic;
|
273 |
|
|
frame_hdr_cache_head->pc_low = pc_low;
|
274 |
|
|
frame_hdr_cache_head->pc_high = pc_high;
|
275 |
|
|
}
|
276 |
|
|
|
277 |
|
|
found:
|
278 |
|
|
|
279 |
|
|
if (!p_eh_frame_hdr)
|
280 |
|
|
return 0;
|
281 |
|
|
|
282 |
|
|
/* Read .eh_frame_hdr header. */
|
283 |
|
|
hdr = (const struct unw_eh_frame_hdr *)
|
284 |
|
|
__RELOC_POINTER (p_eh_frame_hdr->p_vaddr, load_base);
|
285 |
|
|
if (hdr->version != 1)
|
286 |
|
|
return 1;
|
287 |
|
|
|
288 |
|
|
#ifdef CRT_GET_RFIB_DATA
|
289 |
|
|
# ifdef __i386__
|
290 |
|
|
data->dbase = NULL;
|
291 |
|
|
if (p_dynamic)
|
292 |
|
|
{
|
293 |
|
|
/* For dynamically linked executables and shared libraries,
|
294 |
|
|
DT_PLTGOT is the gp value for that object. */
|
295 |
|
|
ElfW(Dyn) *dyn = (ElfW(Dyn) *)
|
296 |
|
|
__RELOC_POINTER (p_dynamic->p_vaddr, load_base);
|
297 |
|
|
for (; dyn->d_tag != DT_NULL ; dyn++)
|
298 |
|
|
if (dyn->d_tag == DT_PLTGOT)
|
299 |
|
|
{
|
300 |
|
|
/* On IA-32, _DYNAMIC is writable and GLIBC has relocated it. */
|
301 |
|
|
data->dbase = (void *) dyn->d_un.d_ptr;
|
302 |
|
|
break;
|
303 |
|
|
}
|
304 |
|
|
}
|
305 |
|
|
# elif defined __FRV_FDPIC__ && defined __linux__
|
306 |
|
|
data->dbase = load_base.got_value;
|
307 |
|
|
# else
|
308 |
|
|
# error What is DW_EH_PE_datarel base on this platform?
|
309 |
|
|
# endif
|
310 |
|
|
#endif
|
311 |
|
|
|
312 |
|
|
p = read_encoded_value_with_base (hdr->eh_frame_ptr_enc,
|
313 |
|
|
base_from_cb_data (hdr->eh_frame_ptr_enc,
|
314 |
|
|
data),
|
315 |
|
|
(const unsigned char *) (hdr + 1),
|
316 |
|
|
&eh_frame);
|
317 |
|
|
|
318 |
|
|
/* We require here specific table encoding to speed things up.
|
319 |
|
|
Also, DW_EH_PE_datarel here means using PT_GNU_EH_FRAME start
|
320 |
|
|
as base, not the processor specific DW_EH_PE_datarel. */
|
321 |
|
|
if (hdr->fde_count_enc != DW_EH_PE_omit
|
322 |
|
|
&& hdr->table_enc == (DW_EH_PE_datarel | DW_EH_PE_sdata4))
|
323 |
|
|
{
|
324 |
|
|
_Unwind_Ptr fde_count;
|
325 |
|
|
|
326 |
|
|
p = read_encoded_value_with_base (hdr->fde_count_enc,
|
327 |
|
|
base_from_cb_data (hdr->fde_count_enc,
|
328 |
|
|
data),
|
329 |
|
|
p, &fde_count);
|
330 |
|
|
/* Shouldn't happen. */
|
331 |
|
|
if (fde_count == 0)
|
332 |
|
|
return 1;
|
333 |
|
|
if ((((_Unwind_Ptr) p) & 3) == 0)
|
334 |
|
|
{
|
335 |
|
|
struct fde_table {
|
336 |
|
|
signed initial_loc __attribute__ ((mode (SI)));
|
337 |
|
|
signed fde __attribute__ ((mode (SI)));
|
338 |
|
|
};
|
339 |
|
|
const struct fde_table *table = (const struct fde_table *) p;
|
340 |
|
|
size_t lo, hi, mid;
|
341 |
|
|
_Unwind_Ptr data_base = (_Unwind_Ptr) hdr;
|
342 |
|
|
fde *f;
|
343 |
|
|
unsigned int f_enc, f_enc_size;
|
344 |
|
|
_Unwind_Ptr range;
|
345 |
|
|
|
346 |
|
|
mid = fde_count - 1;
|
347 |
|
|
if (data->pc < table[0].initial_loc + data_base)
|
348 |
|
|
return 1;
|
349 |
|
|
else if (data->pc < table[mid].initial_loc + data_base)
|
350 |
|
|
{
|
351 |
|
|
lo = 0;
|
352 |
|
|
hi = mid;
|
353 |
|
|
|
354 |
|
|
while (lo < hi)
|
355 |
|
|
{
|
356 |
|
|
mid = (lo + hi) / 2;
|
357 |
|
|
if (data->pc < table[mid].initial_loc + data_base)
|
358 |
|
|
hi = mid;
|
359 |
|
|
else if (data->pc >= table[mid + 1].initial_loc + data_base)
|
360 |
|
|
lo = mid + 1;
|
361 |
|
|
else
|
362 |
|
|
break;
|
363 |
|
|
}
|
364 |
|
|
|
365 |
|
|
gcc_assert (lo < hi);
|
366 |
|
|
}
|
367 |
|
|
|
368 |
|
|
f = (fde *) (table[mid].fde + data_base);
|
369 |
|
|
f_enc = get_fde_encoding (f);
|
370 |
|
|
f_enc_size = size_of_encoded_value (f_enc);
|
371 |
|
|
read_encoded_value_with_base (f_enc & 0x0f, 0,
|
372 |
|
|
&f->pc_begin[f_enc_size], &range);
|
373 |
|
|
if (data->pc < table[mid].initial_loc + data_base + range)
|
374 |
|
|
data->ret = f;
|
375 |
|
|
data->func = (void *) (table[mid].initial_loc + data_base);
|
376 |
|
|
return 1;
|
377 |
|
|
}
|
378 |
|
|
}
|
379 |
|
|
|
380 |
|
|
/* We have no sorted search table, so need to go the slow way.
|
381 |
|
|
As soon as GLIBC will provide API so to notify that a library has been
|
382 |
|
|
removed, we could cache this (and thus use search_object). */
|
383 |
|
|
ob.pc_begin = NULL;
|
384 |
|
|
ob.tbase = data->tbase;
|
385 |
|
|
ob.dbase = data->dbase;
|
386 |
|
|
ob.u.single = (fde *) eh_frame;
|
387 |
|
|
ob.s.i = 0;
|
388 |
|
|
ob.s.b.mixed_encoding = 1; /* Need to assume worst case. */
|
389 |
|
|
data->ret = linear_search_fdes (&ob, (fde *) eh_frame, (void *) data->pc);
|
390 |
|
|
if (data->ret != NULL)
|
391 |
|
|
{
|
392 |
|
|
_Unwind_Ptr func;
|
393 |
|
|
unsigned int encoding = get_fde_encoding (data->ret);
|
394 |
|
|
|
395 |
|
|
read_encoded_value_with_base (encoding,
|
396 |
|
|
base_from_cb_data (encoding, data),
|
397 |
|
|
data->ret->pc_begin, &func);
|
398 |
|
|
data->func = (void *) func;
|
399 |
|
|
}
|
400 |
|
|
return 1;
|
401 |
|
|
}
|
402 |
|
|
|
403 |
|
|
const fde *
|
404 |
|
|
_Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
|
405 |
|
|
{
|
406 |
|
|
struct unw_eh_callback_data data;
|
407 |
|
|
const fde *ret;
|
408 |
|
|
|
409 |
|
|
ret = _Unwind_Find_registered_FDE (pc, bases);
|
410 |
|
|
if (ret != NULL)
|
411 |
|
|
return ret;
|
412 |
|
|
|
413 |
|
|
data.pc = (_Unwind_Ptr) pc;
|
414 |
|
|
data.tbase = NULL;
|
415 |
|
|
data.dbase = NULL;
|
416 |
|
|
data.func = NULL;
|
417 |
|
|
data.ret = NULL;
|
418 |
|
|
data.check_cache = 1;
|
419 |
|
|
|
420 |
|
|
if (dl_iterate_phdr (_Unwind_IteratePhdrCallback, &data) < 0)
|
421 |
|
|
return NULL;
|
422 |
|
|
|
423 |
|
|
if (data.ret)
|
424 |
|
|
{
|
425 |
|
|
bases->tbase = data.tbase;
|
426 |
|
|
bases->dbase = data.dbase;
|
427 |
|
|
bases->func = data.func;
|
428 |
|
|
}
|
429 |
|
|
return data.ret;
|
430 |
|
|
}
|
431 |
|
|
|
432 |
|
|
#else
|
433 |
|
|
/* Prevent multiple include of header files. */
|
434 |
|
|
#define _Unwind_Find_FDE _Unwind_Find_FDE
|
435 |
|
|
#include "unwind-dw2-fde.c"
|
436 |
|
|
#endif
|
437 |
|
|
|
438 |
|
|
#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
|
439 |
|
|
alias (_Unwind_Find_FDE);
|
440 |
|
|
#endif
|