Mercurial > hg > truffle
annotate src/os/aix/vm/porting_aix.cpp @ 19475:b7c9c23f7205
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 18 Feb 2015 12:49:57 +0100 |
parents | 666e6ce3976c |
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rev | line source |
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1 /* |
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2 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "asm/assembler.hpp" |
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26 #include "loadlib_aix.hpp" |
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27 #include "porting_aix.hpp" |
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28 #include "utilities/debug.hpp" |
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29 |
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30 #include <demangle.h> |
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31 #include <sys/debug.h> |
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32 |
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33 ////////////////////////////////// |
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34 // Provide implementation for dladdr based on LoadedLibraries pool and |
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35 // traceback table scan (see getFuncName). |
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36 |
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37 // Search traceback table in stack, |
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38 // return procedure name from trace back table. |
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39 #define MAX_FUNC_SEARCH_LEN 0x10000 |
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40 // Any PC below this value is considered toast. |
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41 #define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024) |
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42 |
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43 #define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2)) |
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44 |
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45 // Align a pointer without having to cast. |
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46 inline char* align_ptr_up(char* ptr, intptr_t alignment) { |
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47 return (char*) align_size_up((intptr_t)ptr, alignment); |
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48 } |
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49 |
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50 // Trace if verbose to tty. |
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51 // I use these now instead of the Xtrace system because the latter is |
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52 // not available at init time, hence worthless. Until we fix this, all |
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53 // tracing here is done with -XX:+Verbose. |
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54 #define trcVerbose(fmt, ...) { \ |
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55 if (Verbose) { \ |
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56 fprintf(stderr, fmt, ##__VA_ARGS__); \ |
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57 fputc('\n', stderr); fflush(stderr); \ |
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58 } \ |
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59 } |
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60 #define ERRBYE(s) { trcVerbose(s); return -1; } |
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61 |
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62 // Unfortunately, the interface of dladdr makes the implementator |
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63 // responsible for maintaining memory for function name/library |
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64 // name. I guess this is because most OS's keep those values as part |
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65 // of the mapped executable image ready to use. On AIX, this doesn't |
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66 // work, so I have to keep the returned strings. For now, I do this in |
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67 // a primitive string map. Should this turn out to be a performance |
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68 // problem, a better hashmap has to be used. |
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69 class fixed_strings { |
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70 struct node { |
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71 char* v; |
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72 node* next; |
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73 }; |
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74 |
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75 node* first; |
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76 |
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77 public: |
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78 |
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79 fixed_strings() : first(0) {} |
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80 ~fixed_strings() { |
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81 node* n = first; |
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82 while (n) { |
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83 node* p = n; |
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84 n = n->next; |
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85 free(p->v); |
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86 delete p; |
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87 } |
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88 } |
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89 |
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90 char* intern(const char* s) { |
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91 for (node* n = first; n; n = n->next) { |
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92 if (strcmp(n->v, s) == 0) { |
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93 return n->v; |
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94 } |
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95 } |
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96 node* p = new node; |
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97 p->v = strdup(s); |
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98 p->next = first; |
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99 first = p; |
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100 return p->v; |
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101 } |
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102 }; |
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103 |
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104 static fixed_strings dladdr_fixed_strings; |
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105 |
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106 // Given a code pointer, returns the function name and the displacement. |
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107 // Function looks for the traceback table at the end of the function. |
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108 extern "C" int getFuncName( |
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109 codeptr_t pc, // [in] program counter |
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110 char* p_name, size_t namelen, // [out] optional: function name ("" if not available) |
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111 int* p_displacement, // [out] optional: displacement (-1 if not available) |
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112 const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further |
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113 // information (NULL if not available) |
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114 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages |
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115 ) { |
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116 struct tbtable* tb = 0; |
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117 unsigned int searchcount = 0; |
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118 |
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119 // initialize output parameters |
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120 if (p_name && namelen > 0) { |
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121 *p_name = '\0'; |
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122 } |
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123 if (p_errmsg && errmsglen > 0) { |
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124 *p_errmsg = '\0'; |
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125 } |
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126 if (p_displacement) { |
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127 *p_displacement = -1; |
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128 } |
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129 if (p_tb) { |
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130 *p_tb = NULL; |
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131 } |
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132 |
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133 // weed out obvious bogus states |
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134 if (pc < MINIMUM_VALUE_FOR_PC) { |
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135 ERRBYE("invalid program counter"); |
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136 } |
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137 |
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138 codeptr_t pc2 = pc; |
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139 |
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140 // make sure the pointer is word aligned. |
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141 pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4); |
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142 |
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143 // Find start of traceback table. |
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144 // (starts after code, is marked by word-aligned (32bit) zeros) |
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145 while ((*pc2 != NULL) && (searchcount++ < MAX_FUNC_SEARCH_LEN)) { |
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146 pc2++; |
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147 } |
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148 if (*pc2 != 0) { |
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149 ERRBYE("could not find traceback table within 5000 bytes of program counter"); |
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150 } |
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151 // |
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152 // Set up addressability to the traceback table |
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153 // |
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154 tb = (struct tbtable*) (pc2 + 1); |
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155 |
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156 // Is this really a traceback table? No way to be sure but |
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157 // some indicators we can check. |
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158 if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) { |
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159 // Language specifiers, go from 0 (C) to 14 (Objective C). |
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160 // According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm. |
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161 ERRBYE("not a traceback table"); |
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162 } |
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163 |
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164 // Existence of fields in the tbtable extension are contingent upon |
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165 // specific fields in the base table. Check for their existence so |
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166 // that we can address the function name if it exists. |
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167 pc2 = (codeptr_t) tb + |
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168 sizeof(struct tbtable_short)/sizeof(int); |
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169 if (tb->tb.fixedparms != 0 || tb->tb.floatparms != 0) |
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170 pc2++; |
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171 |
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172 if (tb->tb.has_tboff == TRUE) { |
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173 |
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174 // I want to know the displacement |
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175 const unsigned int tb_offset = *pc2; |
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176 codeptr_t start_of_procedure = |
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177 (codeptr_t)(((char*)tb) - 4 - tb_offset); // (-4 to omit leading 0000) |
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178 |
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179 // Weed out the cases where we did find the wrong traceback table. |
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180 if (pc < start_of_procedure) { |
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181 ERRBYE("could not find (the real) traceback table within 5000 bytes of program counter"); |
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182 } |
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183 |
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184 // return the displacement |
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185 if (p_displacement) { |
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186 (*p_displacement) = (int) PTRDIFF_BYTES(pc, start_of_procedure); |
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187 } |
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188 |
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189 pc2++; |
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190 } else { |
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191 // return -1 for displacement |
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192 if (p_displacement) { |
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193 (*p_displacement) = -1; |
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194 } |
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195 } |
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196 |
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197 if (tb->tb.int_hndl == TRUE) |
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198 pc2++; |
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199 |
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200 if (tb->tb.has_ctl == TRUE) |
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201 pc2 += (*pc2) + 1; // don't care |
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202 |
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203 // |
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204 // return function name if it exists. |
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205 // |
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206 if (p_name && namelen > 0) { |
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207 if (tb->tb.name_present) { |
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208 char buf[256]; |
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209 const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1); |
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210 memcpy(buf, (char*)pc2 + sizeof(short), l); |
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211 buf[l] = '\0'; |
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212 |
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213 p_name[0] = '\0'; |
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214 |
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215 // If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h). |
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216 char* rest; |
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217 Name* const name = Demangle(buf, rest); |
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218 if (name) { |
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219 const char* const demangled_name = name->Text(); |
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220 if (demangled_name) { |
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221 strncpy(p_name, demangled_name, namelen-1); |
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222 p_name[namelen-1] = '\0'; |
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223 } |
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224 delete name; |
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225 } |
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226 |
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227 // Fallback: if demangling did not work, just provide the unmangled name. |
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228 if (p_name[0] == '\0') { |
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229 strncpy(p_name, buf, namelen-1); |
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230 p_name[namelen-1] = '\0'; |
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231 } |
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232 |
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233 } else { |
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234 strncpy(p_name, "<nameless function>", namelen-1); |
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235 p_name[namelen-1] = '\0'; |
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236 } |
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237 } |
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238 // Return traceback table, if user wants it. |
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239 if (p_tb) { |
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240 (*p_tb) = tb; |
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241 } |
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242 |
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243 return 0; |
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244 } |
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245 |
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246 // Special implementation of dladdr for Aix based on LoadedLibraries |
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247 // Note: dladdr returns non-zero for ok, 0 for error! |
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248 // Note: dladdr is not posix, but a non-standard GNU extension. So this tries to |
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249 // fulfill the contract of dladdr on Linux (see http://linux.die.net/man/3/dladdr) |
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250 // Note: addr may be both an AIX function descriptor or a real code pointer |
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251 // to the entry of a function. |
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252 extern "C" |
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253 int dladdr(void* addr, Dl_info* info) { |
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254 |
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255 if (!addr) { |
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256 return 0; |
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257 } |
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258 |
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259 assert(info, ""); |
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260 |
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261 int rc = 0; |
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262 |
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263 const char* const ZEROSTRING = ""; |
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264 |
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265 // Always return a string, even if a "" one. Linux dladdr manpage |
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266 // does not say anything about returning NULL |
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267 info->dli_fname = ZEROSTRING; |
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268 info->dli_sname = ZEROSTRING; |
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269 info->dli_saddr = NULL; |
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270 |
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271 address p = (address) addr; |
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272 const LoadedLibraryModule* lib = NULL; |
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273 |
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274 enum { noclue, code, data } type = noclue; |
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275 |
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276 trcVerbose("dladdr(%p)...", p); |
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277 |
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278 // Note: input address may be a function. I accept both a pointer to |
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279 // the entry of a function and a pointer to the function decriptor. |
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280 // (see ppc64 ABI) |
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281 lib = LoadedLibraries::find_for_text_address(p); |
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282 if (lib) { |
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283 type = code; |
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284 } |
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285 |
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286 if (!lib) { |
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287 // Not a pointer into any text segment. Is it a function descriptor? |
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288 const FunctionDescriptor* const pfd = (const FunctionDescriptor*) p; |
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289 p = pfd->entry(); |
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290 if (p) { |
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291 lib = LoadedLibraries::find_for_text_address(p); |
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292 if (lib) { |
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293 type = code; |
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294 } |
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295 } |
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296 } |
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297 |
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298 if (!lib) { |
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299 // Neither direct code pointer nor function descriptor. A data ptr? |
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300 p = (address)addr; |
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301 lib = LoadedLibraries::find_for_data_address(p); |
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302 if (lib) { |
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303 type = data; |
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304 } |
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305 } |
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306 |
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307 // If we did find the shared library this address belongs to (either |
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308 // code or data segment) resolve library path and, if possible, the |
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309 // symbol name. |
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310 if (lib) { |
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311 const char* const interned_libpath = |
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312 dladdr_fixed_strings.intern(lib->get_fullpath()); |
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313 if (interned_libpath) { |
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314 info->dli_fname = interned_libpath; |
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315 } |
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316 |
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317 if (type == code) { |
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318 |
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319 // For code symbols resolve function name and displacement. Use |
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320 // displacement to calc start of function. |
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321 char funcname[256] = ""; |
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322 int displacement = 0; |
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323 |
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324 if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement, |
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325 NULL, NULL, 0) == 0) { |
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326 if (funcname[0] != '\0') { |
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327 const char* const interned = dladdr_fixed_strings.intern(funcname); |
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328 info->dli_sname = interned; |
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329 trcVerbose("... function name: %s ...", interned); |
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330 } |
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331 |
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332 // From the displacement calculate the start of the function. |
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333 if (displacement != -1) { |
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334 info->dli_saddr = p - displacement; |
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335 } else { |
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336 info->dli_saddr = p; |
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337 } |
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338 } else { |
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339 |
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340 // No traceback table found. Just assume the pointer is it. |
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341 info->dli_saddr = p; |
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342 |
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343 } |
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344 |
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345 } else if (type == data) { |
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346 |
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347 // For data symbols. |
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348 info->dli_saddr = p; |
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349 |
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350 } else { |
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351 ShouldNotReachHere(); |
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352 } |
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353 |
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354 rc = 1; // success: return 1 [sic] |
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355 |
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356 } |
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357 |
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358 // sanity checks. |
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359 if (rc) { |
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360 assert(info->dli_fname, ""); |
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361 assert(info->dli_sname, ""); |
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362 assert(info->dli_saddr, ""); |
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363 } |
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364 |
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365 return rc; // error: return 0 [sic] |
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366 |
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367 } |