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1 /****************************************************************************
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2 * *
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3 * GNAT RUN-TIME COMPONENTS *
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4 * *
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5 * T R A C E B A C K *
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6 * *
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7 * C Implementation File *
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8 * *
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131
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9 * Copyright (C) 2000-2018, Free Software Foundation, Inc. *
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111
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10 * *
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11 * GNAT is free software; you can redistribute it and/or modify it under *
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12 * terms of the GNU General Public License as published by the Free Soft- *
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13 * ware Foundation; either version 3, or (at your option) any later ver- *
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14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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16 * or FITNESS FOR A PARTICULAR PURPOSE. *
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17 * *
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18 * As a special exception under Section 7 of GPL version 3, you are granted *
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19 * additional permissions described in the GCC Runtime Library Exception, *
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20 * version 3.1, as published by the Free Software Foundation. *
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21 * *
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22 * You should have received a copy of the GNU General Public License and *
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23 * a copy of the GCC Runtime Library Exception along with this program; *
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24 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
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25 * <http://www.gnu.org/licenses/>. *
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26 * *
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27 * GNAT was originally developed by the GNAT team at New York University. *
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28 * Extensive contributions were provided by Ada Core Technologies Inc. *
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29 * *
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30 ****************************************************************************/
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31
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32 /* This file contains low level support for stack unwinding using GCC intrinsic
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33 functions.
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34 It has been tested on the following configurations:
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35 PowerPC/AiX
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36 PowerPC/Darwin
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37 PowerPC/VxWorks
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38 PowerPC/LynxOS-178
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39 SPARC/Solaris
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40 i386/GNU/Linux
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41 i386/Solaris
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42 i386/NT
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43 i386/OS2
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44 i386/LynxOS
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45 Alpha/VxWorks
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46 Alpha/VMS
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47 */
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48
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49 #ifdef __cplusplus
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50 extern "C" {
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51 #endif
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52
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53 #ifdef __alpha_vxworks
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54 #include "vxWorks.h"
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55 #endif
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56
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57 #ifdef IN_RTS
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58 #define POSIX
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59 #include "tconfig.h"
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60 #include "tsystem.h"
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61 #else
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62 #include "config.h"
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63 #include "system.h"
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64 /* We don't want fancy_abort here. */
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65 #undef abort
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66 #endif
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67
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68 extern int __gnat_backtrace (void **, int, void *, void *, int);
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69
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70 /* The point is to provide an implementation of the __gnat_backtrace function
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71 above, called by the default implementation of the System.Traceback package.
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72
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73 We first have a series of target specific implementations, each included
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74 from a separate C file for readability purposes.
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75
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76 Then come two flavors of a generic implementation: one relying on static
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77 assumptions about the frame layout, and the other one using the GCC EH
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78 infrastructure. The former uses a whole set of macros and structures which
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79 may be tailored on a per target basis, and is activated as soon as
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80 USE_GENERIC_UNWINDER is defined. The latter uses a small subset of the
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81 macro definitions and is activated when USE_GCC_UNWINDER is defined. It is
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82 only available post GCC 3.3.
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83
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84 Finally, there is a default dummy implementation, necessary to make the
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85 linker happy on platforms where the feature is not supported, but where the
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86 function is still referenced by the default System.Traceback. */
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87
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88 #define Lock_Task system__soft_links__lock_task
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89 extern void (*Lock_Task) (void);
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90
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91 #define Unlock_Task system__soft_links__unlock_task
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92 extern void (*Unlock_Task) (void);
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93
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94 /*-------------------------------------*
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95 *-- Target specific implementations --*
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96 *-------------------------------------*/
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97
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98 #if defined (_WIN64) && defined (__SEH__)
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99
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100 #include <windows.h>
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101
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102 #define IS_BAD_PTR(ptr) (IsBadCodePtr((FARPROC)ptr))
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103
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104 int
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105 __gnat_backtrace (void **array,
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106 int size,
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107 void *exclude_min,
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108 void *exclude_max,
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109 int skip_frames)
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110 {
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111 CONTEXT context;
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112 UNWIND_HISTORY_TABLE history;
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113 int i;
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114
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115 /* Get the context. */
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116 RtlCaptureContext (&context);
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117
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118 /* Setup unwind history table (a cached to speed-up unwinding). */
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119 memset (&history, 0, sizeof (history));
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120
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121 i = 0;
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122 while (1)
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123 {
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124 PRUNTIME_FUNCTION RuntimeFunction;
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125 KNONVOLATILE_CONTEXT_POINTERS NvContext;
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126 ULONG64 ImageBase;
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127 VOID *HandlerData;
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128 ULONG64 EstablisherFrame;
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129
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130 /* Get function metadata. */
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131 RuntimeFunction = RtlLookupFunctionEntry
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132 (context.Rip, &ImageBase, &history);
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133
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134 if (!RuntimeFunction)
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135 {
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136 /* In case of failure, assume this is a leaf function. */
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137 context.Rip = *(ULONG64 *) context.Rsp;
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138 context.Rsp += 8;
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139 }
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140 else
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141 {
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142 /* If the last unwinding step failed somehow, stop here. */
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143 if (IS_BAD_PTR(context.Rip))
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144 break;
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145
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146 /* Unwind. */
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147 memset (&NvContext, 0, sizeof (KNONVOLATILE_CONTEXT_POINTERS));
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148 RtlVirtualUnwind (0, ImageBase, context.Rip, RuntimeFunction,
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149 &context, &HandlerData, &EstablisherFrame,
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150 &NvContext);
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151 }
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152
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153 /* 0 means bottom of the stack. */
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154 if (context.Rip == 0)
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155 break;
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156
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157 /* Skip frames. */
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158 if (skip_frames > 1)
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159 {
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160 skip_frames--;
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161 continue;
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162 }
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163 /* Excluded frames. */
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164 if ((void *)context.Rip >= exclude_min
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165 && (void *)context.Rip <= exclude_max)
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166 continue;
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167
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168 array[i++] = (void *)(context.Rip - 2);
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169 if (i >= size)
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170 break;
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171 }
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172 return i;
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173 }
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174 #else
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175
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176 /* No target specific implementation. */
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177
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178 /*----------------------------------------------------------------*
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179 *-- Target specific definitions for the generic implementation --*
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180 *----------------------------------------------------------------*/
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181
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182 /* The stack layout is specified by the target ABI. The "generic" scheme is
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183 based on the following assumption:
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184
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185 The stack layout from some frame pointer is such that the information
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186 required to compute the backtrace is available at static offsets.
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187
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188 For a given frame, the information we are interested in is the saved return
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189 address (somewhere after the call instruction in the caller) and a pointer
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190 to the caller's frame. The former is the base of the call chain information
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191 we store in the tracebacks array. The latter allows us to loop over the
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192 successive frames in the chain.
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193
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194 To initiate the process, we retrieve an initial frame address using the
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195 appropriate GCC builtin (__builtin_frame_address).
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196
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197 This scheme is unfortunately not applicable on every target because the
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198 stack layout is not necessarily regular (static) enough. On targets where
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199 this scheme applies, the implementation relies on the following items:
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200
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201 o struct layout, describing the expected stack data layout relevant to the
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202 information we are interested in,
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203
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204 o FRAME_OFFSET, the offset, from a given frame address or frame pointer
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205 value, at which this layout will be found,
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206
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207 o FRAME_LEVEL, controls how many frames up we get at to start with,
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208 from the initial frame pointer we compute by way of the GCC builtin,
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209
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210 0 is most often the appropriate value. 1 may be necessary on targets
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211 where return addresses are saved by a function in it's caller's frame
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212 (e.g. PPC).
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213
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214 o PC_ADJUST, to account for the difference between a call point (address
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215 of a call instruction), which is what we want in the output array, and
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216 the associated return address, which is what we retrieve from the stack.
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217
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218 o STOP_FRAME, to decide whether we reached the top of the call chain, and
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219 thus if the process shall stop.
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220
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221 :
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222 : stack
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223 | +----------------+
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224 | +-------->| : |
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225 | | | (FRAME_OFFSET) |
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226 | | | : | (PC_ADJUST)
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227 | | layout:| return_address ----------------+
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228 | | | .... | |
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229 +--------------- next_frame | |
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230 | | .... | |
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231 | | | |
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232 | +----------------+ | +-----+
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233 | | : |<- Base fp | | : |
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234 | | (FRAME_OFFSET) | (FRAME_LEVEL) | | : |
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235 | | : | +---> | [1]
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236 | layout:| return_address --------------------> | [0]
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237 | | ... | (PC_ADJUST) +-----+
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238 +---------- next_frame | traceback[]
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239 | ... |
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240 | |
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241 +----------------+
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242
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243 o BASE_SKIP,
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244
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245 Since we inherently deal with return addresses, there is an implicit shift
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246 by at least one for the initial point we are able to observe in the chain.
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247
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248 On some targets (e.g. sparc-solaris), the first return address we can
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249 easily get without special code is even our caller's return address, so
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250 there is a initial shift of two.
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251
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252 BASE_SKIP represents this initial shift, which is the minimal "skip_frames"
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253 value we support. We could add special code for the skip_frames < BASE_SKIP
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254 cases. This is not done currently because there is virtually no situation
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255 in which this would be useful.
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256
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257 Finally, to account for some ABI specificities, a target may (but does
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258 not have to) define:
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259
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260 o FORCE_CALL, to force a call to a dummy function at the very beginning
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261 of the computation. See the PPC AIX target for an example where this
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262 is useful.
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263
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264 o FETCH_UP_FRAME, to force an invocation of __builtin_frame_address with a
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265 positive argument right after a possibly forced call even if FRAME_LEVEL
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266 is 0. See the SPARC Solaris case for an example where this is useful.
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267
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268 */
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269
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270 /*------------------- Darwin 8 (OSX 10.4) or newer ----------------------*/
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271 #if defined (__APPLE__) \
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272 && defined (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) \
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273 && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1040
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274
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275 #define USE_GCC_UNWINDER
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276
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277 #if defined (__i386__) || defined (__x86_64__)
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278 #define PC_ADJUST -2
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279 #elif defined (__ppc__) || defined (__ppc64__)
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280 #define PC_ADJUST -4
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281 #elif defined (__arm__)
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282 #define PC_ADJUST -2
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283 #elif defined (__arm64__)
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284 #define PC_ADJUST -4
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285 #else
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286 #error Unhandled darwin architecture.
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287 #endif
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288
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289 /*---------------------------- x86 *BSD --------------------------------*/
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290
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291 #elif defined (__i386__) && \
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292 ( defined (__NetBSD__) || defined (__FreeBSD__) || defined (__OpenBSD__) )
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293
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294 #define USE_GCC_UNWINDER
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295 /* The generic unwinder is not used for this target because the default
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296 implementation doesn't unwind on the BSD platforms. AMD64 targets use the
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297 gcc unwinder for all platforms, so let's keep i386 consistent with that.
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298 */
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299
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300 #define PC_ADJUST -2
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301 /* The minimum size of call instructions on this architecture is 2 bytes */
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302
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303 /*---------------------- ARM VxWorks ------------------------------------*/
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304 #elif (defined (ARMEL) && defined (__vxworks))
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305
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306 #include "vxWorks.h"
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307 #include "version.h"
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308
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309 #define USE_GCC_UNWINDER
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310 #define PC_ADJUST -2
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311
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131
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312 #if ((_WRS_VXWORKS_MAJOR >= 7) && (_VX_CPU != ARMARCH8A))
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111
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313 #define USING_ARM_UNWINDING 1
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314 #endif
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315
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316 /*---------------------- PPC AIX/PPC Lynx 178/Older Darwin --------------*/
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317 #elif ((defined (_POWER) && defined (_AIX)) || \
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318 (defined (__powerpc__) && defined (__Lynx__) && !defined(__ELF__)) || \
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319 (defined (__ppc__) && defined (__APPLE__)))
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320
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321 #define USE_GENERIC_UNWINDER
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322
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323 struct layout
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324 {
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325 struct layout *next;
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326 void *pad;
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327 void *return_address;
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328 };
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329
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330 #define FRAME_OFFSET(FP) 0
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331 #define PC_ADJUST -4
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332
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333 /* Eventhough the base PPC ABI states that a toplevel frame entry
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334 should to feature a null backchain, AIX might expose a null return
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335 address instead. */
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336
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337 /* Then LynxOS-178 features yet another variation, with return_address
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338 == &<entrypoint>, with two possible entry points (one for the main
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339 process and one for threads). Beware that &bla returns the address
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340 of a descriptor when "bla" is a function. Getting the code address
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341 requires an extra dereference. */
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342
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343 #if defined (__Lynx__)
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344 extern void __start(); /* process entry point. */
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345 extern void __runnit(); /* thread entry point. */
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346 #define EXTRA_STOP_CONDITION(CURRENT) \
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347 ((CURRENT)->return_address == *(void**)&__start \
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348 || (CURRENT)->return_address == *(void**)&__runnit)
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349 #else
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350 #define EXTRA_STOP_CONDITION(CURRENT) (0)
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351 #endif
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352
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353 #define STOP_FRAME(CURRENT, TOP_STACK) \
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354 (((void *) (CURRENT) < (TOP_STACK)) \
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355 || (CURRENT)->return_address == NULL \
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356 || EXTRA_STOP_CONDITION(CURRENT))
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357
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358 /* The PPC ABI has an interesting specificity: the return address saved by a
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359 function is located in it's caller's frame, and the save operation only
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360 takes place if the function performs a call.
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361
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362 To have __gnat_backtrace retrieve its own return address, we then
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363 define ... */
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364
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365 #define FORCE_CALL 1
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366 #define FRAME_LEVEL 1
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367
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368 #define BASE_SKIP 1
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369
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370 /*----------- PPC ELF (GNU/Linux & VxWorks & Lynx178e) -------------------*/
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371
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372 #elif (defined (_ARCH_PPC) && defined (__vxworks)) || \
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373 (defined (__powerpc__) && defined (__Lynx__) && defined(__ELF__)) || \
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374 (defined (__linux__) && defined (__powerpc__))
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375
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131
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376 #if defined (_ARCH_PPC64) && !defined (__USING_SJLJ_EXCEPTIONS__)
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377 #define USE_GCC_UNWINDER
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378 #else
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111
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379 #define USE_GENERIC_UNWINDER
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131
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380 #endif
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111
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381
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382 struct layout
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383 {
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384 struct layout *next;
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385 void *return_address;
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386 };
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387
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388 #define FORCE_CALL 1
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389 #define FRAME_LEVEL 1
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390 /* See the PPC AIX case for an explanation of these values. */
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391
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392 #define FRAME_OFFSET(FP) 0
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393 #define PC_ADJUST -4
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394
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395 /* According to the base PPC ABI, a toplevel frame entry should feature
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396 a null backchain. What happens at signal handler frontiers isn't so
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397 well specified, so we add a safety guard on top. */
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398
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399 #define STOP_FRAME(CURRENT, TOP_STACK) \
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400 ((CURRENT)->next == 0 || ((long)(CURRENT)->next % __alignof__(void*)) != 0)
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401
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402 #define BASE_SKIP 1
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403
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404 /*-------------------------- SPARC Solaris -----------------------------*/
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405
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406 #elif defined (__sun__) && defined (__sparc__)
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407
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408 #define USE_GENERIC_UNWINDER
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409
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410 /* These definitions are inspired from the Appendix D (Software
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411 Considerations) of the SPARC V8 architecture manual. */
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412
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413 struct layout
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414 {
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415 struct layout *next;
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416 void *return_address;
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417 };
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418
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419 #ifdef __arch64__
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420 #define STACK_BIAS 2047 /* V9 ABI */
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421 #else
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422 #define STACK_BIAS 0 /* V8 ABI */
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423 #endif
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424
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425 #define FRAME_LEVEL 0
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426 #define FRAME_OFFSET(FP) (14 * sizeof (void*) + (FP ? STACK_BIAS : 0))
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427 #define PC_ADJUST 0
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|
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428 #define STOP_FRAME(CURRENT, TOP_STACK) \
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429 ((CURRENT)->return_address == 0|| (CURRENT)->next == 0 \
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430 || (void *) (CURRENT) < (TOP_STACK))
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431
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432 /* The SPARC register windows need to be flushed before we may access them
|
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|
433 from the stack. This is achieved by way of builtin_frame_address only
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434 when the "count" argument is positive, so force at least one such call. */
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435 #define FETCH_UP_FRAME_ADDRESS
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|
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436
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|
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437 #define BASE_SKIP 2
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|
438 /* From the frame pointer of frame N, we are accessing the flushed register
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439 window of frame N-1 (positive offset from fp), in which we retrieve the
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|
|
440 saved return address. We then end up with our caller's return address. */
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441
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|
|
442 /*---------------------------- x86 & x86_64 ---------------------------------*/
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443
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|
|
444 #elif defined (__i386__) || defined (__x86_64__)
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445
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|
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446 #if defined (__WIN32)
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447 #include <windows.h>
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448 #define IS_BAD_PTR(ptr) (IsBadCodePtr((FARPROC)ptr))
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449 #elif defined (__sun__)
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|
450 #define IS_BAD_PTR(ptr) ((unsigned long)ptr == -1UL)
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451 #else
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|
|
452 #define IS_BAD_PTR(ptr) 0
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|
|
453 #endif
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454
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455 /* Use the dwarf2 unwinder when we expect to have dwarf2 tables at
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456 hand. Backtraces will reliably stop on frames missing such tables,
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457 but our only alternative is the generic unwinder which requires
|
|
|
458 compilation forcing a frame pointer to be reliable. */
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|
|
459
|
|
|
460 #if (defined (__x86_64__) || defined (__linux__)) && !defined (__USING_SJLJ_EXCEPTIONS__)
|
|
|
461 #define USE_GCC_UNWINDER
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|
|
462 #else
|
|
|
463 #define USE_GENERIC_UNWINDER
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|
|
464 #endif
|
|
|
465
|
|
|
466 struct layout
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|
|
467 {
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|
|
468 struct layout *next;
|
|
|
469 void *return_address;
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|
|
470 };
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|
|
471
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|
|
472 #define FRAME_LEVEL 1
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|
|
473 /* builtin_frame_address (1) is expected to work on this family of targets,
|
|
|
474 and (0) might return the soft stack pointer, which does not designate a
|
|
|
475 location where a backchain and a return address might be found. */
|
|
|
476
|
|
|
477 #define FRAME_OFFSET(FP) 0
|
|
|
478 #define PC_ADJUST -2
|
|
|
479 #define STOP_FRAME(CURRENT, TOP_STACK) \
|
|
|
480 (IS_BAD_PTR((long)(CURRENT)) \
|
|
131
|
481 || (void *) (CURRENT) < (TOP_STACK) \
|
|
111
|
482 || IS_BAD_PTR((long)(CURRENT)->return_address) \
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|
|
483 || (CURRENT)->return_address == 0 \
|
|
|
484 || (void *) ((CURRENT)->next) < (TOP_STACK) \
|
|
131
|
485 || EXTRA_STOP_CONDITION(CURRENT))
|
|
111
|
486
|
|
|
487 #define BASE_SKIP (1+FRAME_LEVEL)
|
|
|
488
|
|
|
489 /* On i386 architecture we check that at the call point we really have a call
|
|
|
490 insn. Possible call instructions are:
|
|
|
491
|
|
|
492 call addr16 E8 xx xx xx xx
|
|
|
493 call reg FF Dx
|
|
|
494 call off(reg) FF xx xx
|
|
|
495 lcall addr seg 9A xx xx xx xx xx xx
|
|
|
496
|
|
|
497 This check will not catch all cases but it will increase the backtrace
|
|
|
498 reliability on this architecture.
|
|
|
499 */
|
|
|
500
|
|
|
501 #define VALID_STACK_FRAME(ptr) \
|
|
|
502 (!IS_BAD_PTR(ptr) \
|
|
|
503 && (((*((ptr) - 3) & 0xff) == 0xe8) \
|
|
|
504 || ((*((ptr) - 5) & 0xff) == 0x9a) \
|
|
|
505 || ((*((ptr) - 1) & 0xff) == 0xff) \
|
|
|
506 || (((*(ptr) & 0xd0ff) == 0xd0ff))))
|
|
|
507
|
|
131
|
508 #if defined (__vxworks) && defined (__RTP__)
|
|
|
509
|
|
|
510 /* For VxWorks following backchains past the "main" frame gets us into the
|
|
|
511 kernel space, where it can't be dereferenced. So lets stop at the main
|
|
|
512 symbol. */
|
|
|
513 extern void main();
|
|
|
514
|
|
|
515 static int
|
|
|
516 is_return_from(void *symbol_addr, void *ret_addr)
|
|
|
517 {
|
|
|
518 int ret = 0;
|
|
|
519 char *ptr = (char *)ret_addr;
|
|
|
520
|
|
|
521 if ((*(ptr - 5) & 0xff) == 0xe8)
|
|
|
522 {
|
|
|
523 /* call addr16 E8 xx xx xx xx */
|
|
|
524 int32_t offset = *(int32_t *)(ptr - 4);
|
|
|
525 ret = (ptr + offset) == symbol_addr;
|
|
|
526 }
|
|
|
527
|
|
|
528 /* Others not implemented yet... But it is very likely that call addr16
|
|
|
529 is used here. */
|
|
|
530 return ret;
|
|
|
531 }
|
|
|
532
|
|
|
533 #define EXTRA_STOP_CONDITION(CURRENT) \
|
|
|
534 (is_return_from(&main, (CURRENT)->return_address))
|
|
|
535 #else /* not (defined (__vxworks) && defined (__RTP__)) */
|
|
|
536 #define EXTRA_STOP_CONDITION(CURRENT) (0)
|
|
|
537 #endif /* not (defined (__vxworks) && defined (__RTP__)) */
|
|
|
538
|
|
|
539 /*----------------------------- qnx ----------------------------------*/
|
|
|
540
|
|
|
541 #elif defined (__QNX__)
|
|
|
542
|
|
|
543 #define USE_GCC_UNWINDER
|
|
|
544
|
|
|
545 #if defined (__aarch64__)
|
|
|
546 #define PC_ADJUST -4
|
|
|
547 #else
|
|
|
548 #error Unhandled QNX architecture.
|
|
|
549 #endif
|
|
|
550
|
|
|
551 /*------------------- aarch64-linux ----------------------------------*/
|
|
|
552
|
|
|
553 #elif (defined (__aarch64__) && defined (__linux__))
|
|
|
554
|
|
|
555 #define USE_GCC_UNWINDER
|
|
|
556 #define PC_ADJUST -4
|
|
|
557
|
|
111
|
558 /*----------------------------- ia64 ---------------------------------*/
|
|
|
559
|
|
|
560 #elif defined (__ia64__) && (defined (__linux__) || defined (__hpux__))
|
|
|
561
|
|
|
562 #define USE_GCC_UNWINDER
|
|
|
563 /* Use _Unwind_Backtrace driven exceptions on ia64 HP-UX and ia64
|
|
|
564 GNU/Linux, where _Unwind_Backtrace is provided by the system unwind
|
|
|
565 library. On HP-UX 11.23 this requires patch PHSS_33352, which adds
|
|
|
566 _Unwind_Backtrace to the system unwind library. */
|
|
|
567
|
|
|
568 #define PC_ADJUST -4
|
|
|
569
|
|
|
570
|
|
|
571 #endif
|
|
|
572
|
|
|
573 /*---------------------------------------------------------------------*
|
|
|
574 *-- The post GCC 3.3 infrastructure based implementation --*
|
|
|
575 *---------------------------------------------------------------------*/
|
|
|
576
|
|
|
577 #if defined (USE_GCC_UNWINDER) && (__GNUC__ * 10 + __GNUC_MINOR__ > 33)
|
|
|
578
|
|
|
579 /* Conditioning the inclusion on the GCC version is useful to avoid bootstrap
|
|
|
580 path problems, since the included file refers to post 3.3 functions in
|
|
|
581 libgcc, and the stage1 compiler is unlikely to be linked against a post 3.3
|
|
|
582 library. It actually disables the support for backtraces in this compiler
|
|
|
583 for targets defining USE_GCC_UNWINDER, which is OK since we don't use the
|
|
|
584 traceback capability in the compiler anyway.
|
|
|
585
|
|
|
586 The condition is expressed the way above because we cannot reliably rely on
|
|
|
587 any other macro from the base compiler when compiling stage1. */
|
|
|
588
|
|
|
589 #ifdef USING_ARM_UNWINDING
|
|
|
590 /* This value is not part of the enumerated reason codes defined in unwind.h
|
|
|
591 for ARM style unwinding, but is used in the included "C" code, so we
|
|
|
592 define it to a reasonable value to avoid a compilation error. */
|
|
|
593 #define _URC_NORMAL_STOP 0
|
|
|
594 #endif
|
|
|
595 #include "tb-gcc.c"
|
|
|
596
|
|
|
597 /*------------------------------------------------------------------*
|
|
|
598 *-- The generic implementation based on frame layout assumptions --*
|
|
|
599 *------------------------------------------------------------------*/
|
|
|
600
|
|
|
601 #elif defined (USE_GENERIC_UNWINDER)
|
|
|
602
|
|
|
603 #ifndef CURRENT_STACK_FRAME
|
|
|
604 # define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
|
|
|
605 #endif
|
|
|
606
|
|
|
607 #ifndef VALID_STACK_FRAME
|
|
|
608 #define VALID_STACK_FRAME(ptr) 1
|
|
|
609 #endif
|
|
|
610
|
|
|
611 #ifndef MAX
|
|
|
612 #define MAX(x,y) ((x) > (y) ? (x) : (y))
|
|
|
613 #endif
|
|
|
614
|
|
|
615 #ifndef FORCE_CALL
|
|
|
616 #define FORCE_CALL 0
|
|
|
617 #endif
|
|
|
618
|
|
|
619 /* Make sure the function is not inlined. */
|
|
|
620 static void forced_callee (void) __attribute__ ((noinline));
|
|
|
621
|
|
|
622 static void forced_callee (void)
|
|
|
623 {
|
|
|
624 /* Make sure the function is not pure. */
|
|
|
625 volatile int i __attribute__ ((unused)) = 0;
|
|
|
626 }
|
|
|
627
|
|
|
628 int
|
|
|
629 __gnat_backtrace (void **array,
|
|
|
630 int size,
|
|
|
631 void *exclude_min,
|
|
|
632 void *exclude_max,
|
|
|
633 int skip_frames)
|
|
|
634 {
|
|
|
635 struct layout *current;
|
|
|
636 void *top_frame;
|
|
|
637 void *top_stack ATTRIBUTE_UNUSED;
|
|
|
638 int cnt = 0;
|
|
|
639
|
|
|
640 if (FORCE_CALL)
|
|
|
641 forced_callee ();
|
|
|
642
|
|
|
643 /* Force a call to builtin_frame_address with a positive argument
|
|
|
644 if required. This is necessary e.g. on SPARC to have the register
|
|
|
645 windows flushed before we attempt to access them on the stack. */
|
|
|
646 #if defined (FETCH_UP_FRAME_ADDRESS) && (FRAME_LEVEL == 0)
|
|
|
647 __builtin_frame_address (1);
|
|
|
648 #endif
|
|
|
649
|
|
|
650 top_frame = __builtin_frame_address (FRAME_LEVEL);
|
|
|
651 top_stack = CURRENT_STACK_FRAME;
|
|
|
652 current = (struct layout *) ((size_t) top_frame + FRAME_OFFSET (0));
|
|
|
653
|
|
|
654 /* Skip the number of calls we have been requested to skip, accounting for
|
|
|
655 the BASE_SKIP parameter.
|
|
|
656
|
|
|
657 FRAME_LEVEL is meaningless for the count adjustment. It impacts where we
|
|
|
658 start retrieving data from, but how many frames "up" we start at is in
|
|
|
659 BASE_SKIP by definition. */
|
|
|
660
|
|
|
661 skip_frames = MAX (0, skip_frames - BASE_SKIP);
|
|
|
662
|
|
|
663 while (cnt < skip_frames)
|
|
|
664 {
|
|
|
665 current = (struct layout *) ((size_t) current->next + FRAME_OFFSET (1));
|
|
|
666 cnt++;
|
|
|
667 }
|
|
|
668
|
|
|
669 cnt = 0;
|
|
|
670 while (cnt < size)
|
|
|
671 {
|
|
|
672 if (STOP_FRAME (current, top_stack) ||
|
|
|
673 !VALID_STACK_FRAME(((char *) current->return_address) + PC_ADJUST))
|
|
|
674 break;
|
|
|
675
|
|
|
676 if (current->return_address < exclude_min
|
|
|
677 || current->return_address > exclude_max)
|
|
|
678 array[cnt++] = ((char *) current->return_address) + PC_ADJUST;
|
|
|
679
|
|
|
680 current = (struct layout *) ((size_t) current->next + FRAME_OFFSET (1));
|
|
|
681 }
|
|
|
682
|
|
|
683 return cnt;
|
|
|
684 }
|
|
|
685
|
|
|
686 #else
|
|
|
687
|
|
|
688 /* No target specific implementation and neither USE_GCC_UNWINDER nor
|
|
|
689 USE_GENERIC_UNWINDER defined. */
|
|
|
690
|
|
|
691 /*------------------------------*
|
|
|
692 *-- The dummy implementation --*
|
|
|
693 *------------------------------*/
|
|
|
694
|
|
|
695 int
|
|
|
696 __gnat_backtrace (void **array ATTRIBUTE_UNUSED,
|
|
|
697 int size ATTRIBUTE_UNUSED,
|
|
|
698 void *exclude_min ATTRIBUTE_UNUSED,
|
|
|
699 void *exclude_max ATTRIBUTE_UNUSED,
|
|
|
700 int skip_frames ATTRIBUTE_UNUSED)
|
|
|
701 {
|
|
|
702 return 0;
|
|
|
703 }
|
|
|
704
|
|
|
705 #endif
|
|
|
706
|
|
|
707 #endif
|
|
|
708
|
|
|
709 #ifdef __cplusplus
|
|
|
710 }
|
|
|
711 #endif
|
