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annotate third_party/luajit/src/lj_mcode.c @ 279:b3b547563ec7

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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 94705b5986b3
children
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178
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1 /*
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2 ** Machine code management.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #define lj_mcode_c
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7 #define LUA_CORE
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8
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9 #include "lj_obj.h"
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10 #if LJ_HASJIT
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11 #include "lj_gc.h"
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12 #include "lj_err.h"
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13 #include "lj_jit.h"
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14 #include "lj_mcode.h"
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15 #include "lj_trace.h"
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16 #include "lj_dispatch.h"
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17 #include "lj_prng.h"
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18 #endif
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19 #if LJ_HASJIT || LJ_HASFFI
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20 #include "lj_vm.h"
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21 #endif
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22
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23 /* -- OS-specific functions ----------------------------------------------- */
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24
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25 #if LJ_HASJIT || LJ_HASFFI
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26
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27 /* Define this if you want to run LuaJIT with Valgrind. */
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28 #ifdef LUAJIT_USE_VALGRIND
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29 #include <valgrind/valgrind.h>
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30 #endif
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31
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32 #if LJ_TARGET_IOS
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33 void sys_icache_invalidate(void *start, size_t len);
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34 #endif
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35
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36 /* Synchronize data/instruction cache. */
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37 void lj_mcode_sync(void *start, void *end)
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38 {
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39 #ifdef LUAJIT_USE_VALGRIND
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40 VALGRIND_DISCARD_TRANSLATIONS(start, (char *)end-(char *)start);
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41 #endif
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42 #if LJ_TARGET_X86ORX64
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43 UNUSED(start); UNUSED(end);
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44 #elif LJ_TARGET_IOS
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45 sys_icache_invalidate(start, (char *)end-(char *)start);
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46 #elif LJ_TARGET_PPC
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47 lj_vm_cachesync(start, end);
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48 #elif defined(__GNUC__) || defined(__clang__)
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49 __clear_cache(start, end);
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50 #else
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51 #error "Missing builtin to flush instruction cache"
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52 #endif
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53 }
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54
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55 #endif
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56
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57 #if LJ_HASJIT
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58
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59 #if LJ_TARGET_WINDOWS
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60
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61 #define WIN32_LEAN_AND_MEAN
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62 #include <windows.h>
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63
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64 #define MCPROT_RW PAGE_READWRITE
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65 #define MCPROT_RX PAGE_EXECUTE_READ
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66 #define MCPROT_RWX PAGE_EXECUTE_READWRITE
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67
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68 static void *mcode_alloc_at(jit_State *J, uintptr_t hint, size_t sz, DWORD prot)
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69 {
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70 void *p = LJ_WIN_VALLOC((void *)hint, sz,
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71 MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN, prot);
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72 if (!p && !hint)
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73 lj_trace_err(J, LJ_TRERR_MCODEAL);
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74 return p;
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75 }
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76
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77 static void mcode_free(jit_State *J, void *p, size_t sz)
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78 {
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79 UNUSED(J); UNUSED(sz);
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80 VirtualFree(p, 0, MEM_RELEASE);
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81 }
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82
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83 static int mcode_setprot(void *p, size_t sz, DWORD prot)
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84 {
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85 DWORD oprot;
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86 return !LJ_WIN_VPROTECT(p, sz, prot, &oprot);
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87 }
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88
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89 #elif LJ_TARGET_POSIX
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90
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91 #include <sys/mman.h>
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92
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93 #ifndef MAP_ANONYMOUS
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94 #define MAP_ANONYMOUS MAP_ANON
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95 #endif
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96
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97 #define MCPROT_RW (PROT_READ|PROT_WRITE)
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98 #define MCPROT_RX (PROT_READ|PROT_EXEC)
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99 #define MCPROT_RWX (PROT_READ|PROT_WRITE|PROT_EXEC)
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100 #ifdef PROT_MPROTECT
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101 #define MCPROT_CREATE (PROT_MPROTECT(MCPROT_RWX))
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102 #else
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103 #define MCPROT_CREATE 0
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104 #endif
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105
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106 static void *mcode_alloc_at(jit_State *J, uintptr_t hint, size_t sz, int prot)
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107 {
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108 void *p = mmap((void *)hint, sz, prot|MCPROT_CREATE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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109 if (p == MAP_FAILED) {
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110 if (!hint) lj_trace_err(J, LJ_TRERR_MCODEAL);
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111 p = NULL;
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112 }
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113 return p;
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114 }
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115
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116 static void mcode_free(jit_State *J, void *p, size_t sz)
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117 {
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118 UNUSED(J);
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119 munmap(p, sz);
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120 }
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121
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122 static int mcode_setprot(void *p, size_t sz, int prot)
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123 {
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124 return mprotect(p, sz, prot);
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125 }
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126
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127 #else
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128
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129 #error "Missing OS support for explicit placement of executable memory"
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130
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131 #endif
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132
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133 /* -- MCode area protection ----------------------------------------------- */
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134
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135 #if LUAJIT_SECURITY_MCODE == 0
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136
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137 /* Define this ONLY if page protection twiddling becomes a bottleneck.
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138 **
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139 ** It's generally considered to be a potential security risk to have
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140 ** pages with simultaneous write *and* execute access in a process.
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141 **
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142 ** Do not even think about using this mode for server processes or
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143 ** apps handling untrusted external data.
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144 **
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145 ** The security risk is not in LuaJIT itself -- but if an adversary finds
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146 ** any *other* flaw in your C application logic, then any RWX memory pages
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147 ** simplify writing an exploit considerably.
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148 */
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149 #define MCPROT_GEN MCPROT_RWX
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150 #define MCPROT_RUN MCPROT_RWX
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151
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152 static void mcode_protect(jit_State *J, int prot)
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153 {
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154 UNUSED(J); UNUSED(prot); UNUSED(mcode_setprot);
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155 }
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156
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157 #else
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158
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159 /* This is the default behaviour and much safer:
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160 **
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161 ** Most of the time the memory pages holding machine code are executable,
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162 ** but NONE of them is writable.
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163 **
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164 ** The current memory area is marked read-write (but NOT executable) only
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165 ** during the short time window while the assembler generates machine code.
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166 */
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167 #define MCPROT_GEN MCPROT_RW
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168 #define MCPROT_RUN MCPROT_RX
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169
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170 /* Protection twiddling failed. Probably due to kernel security. */
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171 static LJ_NORET LJ_NOINLINE void mcode_protfail(jit_State *J)
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172 {
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173 lua_CFunction panic = J2G(J)->panic;
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174 if (panic) {
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175 lua_State *L = J->L;
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176 setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITPROT));
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177 panic(L);
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178 }
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179 exit(EXIT_FAILURE);
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180 }
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181
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182 /* Change protection of MCode area. */
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183 static void mcode_protect(jit_State *J, int prot)
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184 {
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185 if (J->mcprot != prot) {
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186 if (LJ_UNLIKELY(mcode_setprot(J->mcarea, J->szmcarea, prot)))
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187 mcode_protfail(J);
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188 J->mcprot = prot;
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189 }
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190 }
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191
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192 #endif
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193
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194 /* -- MCode area allocation ----------------------------------------------- */
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195
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196 #if LJ_64
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197 #define mcode_validptr(p) (p)
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198 #else
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199 #define mcode_validptr(p) ((p) && (uintptr_t)(p) < 0xffff0000)
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200 #endif
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201
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202 #ifdef LJ_TARGET_JUMPRANGE
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203
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204 /* Get memory within relative jump distance of our code in 64 bit mode. */
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205 static void *mcode_alloc(jit_State *J, size_t sz)
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206 {
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207 /* Target an address in the static assembler code (64K aligned).
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208 ** Try addresses within a distance of target-range/2+1MB..target+range/2-1MB.
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209 ** Use half the jump range so every address in the range can reach any other.
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210 */
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211 #if LJ_TARGET_MIPS
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212 /* Use the middle of the 256MB-aligned region. */
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213 uintptr_t target = ((uintptr_t)(void *)lj_vm_exit_handler &
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214 ~(uintptr_t)0x0fffffffu) + 0x08000000u;
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215 #else
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216 uintptr_t target = (uintptr_t)(void *)lj_vm_exit_handler & ~(uintptr_t)0xffff;
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217 #endif
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218 const uintptr_t range = (1u << (LJ_TARGET_JUMPRANGE-1)) - (1u << 21);
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219 /* First try a contiguous area below the last one. */
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220 uintptr_t hint = J->mcarea ? (uintptr_t)J->mcarea - sz : 0;
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221 int i;
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222 /* Limit probing iterations, depending on the available pool size. */
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223 for (i = 0; i < LJ_TARGET_JUMPRANGE; i++) {
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224 if (mcode_validptr(hint)) {
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225 void *p = mcode_alloc_at(J, hint, sz, MCPROT_GEN);
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226
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227 if (mcode_validptr(p) &&
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228 ((uintptr_t)p + sz - target < range || target - (uintptr_t)p < range))
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229 return p;
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230 if (p) mcode_free(J, p, sz); /* Free badly placed area. */
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231 }
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232 /* Next try probing 64K-aligned pseudo-random addresses. */
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233 do {
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234 hint = lj_prng_u64(&J2G(J)->prng) & ((1u<<LJ_TARGET_JUMPRANGE)-0x10000);
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235 } while (!(hint + sz < range+range));
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236 hint = target + hint - range;
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237 }
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238 lj_trace_err(J, LJ_TRERR_MCODEAL); /* Give up. OS probably ignores hints? */
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239 return NULL;
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240 }
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241
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242 #else
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243
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244 /* All memory addresses are reachable by relative jumps. */
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245 static void *mcode_alloc(jit_State *J, size_t sz)
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246 {
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247 #if defined(__OpenBSD__) || defined(__NetBSD__) || LJ_TARGET_UWP
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248 /* Allow better executable memory allocation for OpenBSD W^X mode. */
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249 void *p = mcode_alloc_at(J, 0, sz, MCPROT_RUN);
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250 if (p && mcode_setprot(p, sz, MCPROT_GEN)) {
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251 mcode_free(J, p, sz);
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252 return NULL;
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253 }
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254 return p;
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255 #else
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256 return mcode_alloc_at(J, 0, sz, MCPROT_GEN);
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257 #endif
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258 }
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259
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260 #endif
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261
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
262 /* -- MCode area management ----------------------------------------------- */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
263
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
264 /* Allocate a new MCode area. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
265 static void mcode_allocarea(jit_State *J)
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MrJuneJune <me@mrjunejune.com>
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diff changeset
266 {
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MrJuneJune <me@mrjunejune.com>
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diff changeset
267 MCode *oldarea = J->mcarea;
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MrJuneJune <me@mrjunejune.com>
parents:
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268 size_t sz = (size_t)J->param[JIT_P_sizemcode] << 10;
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269 sz = (sz + LJ_PAGESIZE-1) & ~(size_t)(LJ_PAGESIZE - 1);
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MrJuneJune <me@mrjunejune.com>
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270 J->mcarea = (MCode *)mcode_alloc(J, sz);
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MrJuneJune <me@mrjunejune.com>
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271 J->szmcarea = sz;
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MrJuneJune <me@mrjunejune.com>
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272 J->mcprot = MCPROT_GEN;
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MrJuneJune <me@mrjunejune.com>
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273 J->mctop = (MCode *)((char *)J->mcarea + J->szmcarea);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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274 J->mcbot = (MCode *)((char *)J->mcarea + sizeof(MCLink));
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275 ((MCLink *)J->mcarea)->next = oldarea;
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276 ((MCLink *)J->mcarea)->size = sz;
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MrJuneJune <me@mrjunejune.com>
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277 J->szallmcarea += sz;
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MrJuneJune <me@mrjunejune.com>
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278 J->mcbot = (MCode *)lj_err_register_mcode(J->mcarea, sz, (uint8_t *)J->mcbot);
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MrJuneJune <me@mrjunejune.com>
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279 }
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280
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MrJuneJune <me@mrjunejune.com>
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281 /* Free all MCode areas. */
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MrJuneJune <me@mrjunejune.com>
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282 void lj_mcode_free(jit_State *J)
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283 {
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MrJuneJune <me@mrjunejune.com>
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284 MCode *mc = J->mcarea;
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MrJuneJune <me@mrjunejune.com>
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285 J->mcarea = NULL;
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MrJuneJune <me@mrjunejune.com>
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286 J->szallmcarea = 0;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
287 while (mc) {
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MrJuneJune <me@mrjunejune.com>
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288 MCode *next = ((MCLink *)mc)->next;
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289 size_t sz = ((MCLink *)mc)->size;
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MrJuneJune <me@mrjunejune.com>
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290 lj_err_deregister_mcode(mc, sz, (uint8_t *)mc + sizeof(MCLink));
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MrJuneJune <me@mrjunejune.com>
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291 mcode_free(J, mc, sz);
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MrJuneJune <me@mrjunejune.com>
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292 mc = next;
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MrJuneJune <me@mrjunejune.com>
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293 }
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MrJuneJune <me@mrjunejune.com>
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294 }
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295
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MrJuneJune <me@mrjunejune.com>
parents:
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296 /* -- MCode transactions -------------------------------------------------- */
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297
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298 /* Reserve the remainder of the current MCode area. */
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MrJuneJune <me@mrjunejune.com>
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299 MCode *lj_mcode_reserve(jit_State *J, MCode **lim)
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300 {
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MrJuneJune <me@mrjunejune.com>
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301 if (!J->mcarea)
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MrJuneJune <me@mrjunejune.com>
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diff changeset
302 mcode_allocarea(J);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
303 else
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MrJuneJune <me@mrjunejune.com>
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304 mcode_protect(J, MCPROT_GEN);
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MrJuneJune <me@mrjunejune.com>
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305 *lim = J->mcbot;
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306 return J->mctop;
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MrJuneJune <me@mrjunejune.com>
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307 }
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308
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309 /* Commit the top part of the current MCode area. */
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310 void lj_mcode_commit(jit_State *J, MCode *top)
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parents:
diff changeset
311 {
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MrJuneJune <me@mrjunejune.com>
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312 J->mctop = top;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
313 mcode_protect(J, MCPROT_RUN);
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314 }
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315
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316 /* Abort the reservation. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
317 void lj_mcode_abort(jit_State *J)
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MrJuneJune <me@mrjunejune.com>
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318 {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
319 if (J->mcarea)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
320 mcode_protect(J, MCPROT_RUN);
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MrJuneJune <me@mrjunejune.com>
parents:
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321 }
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MrJuneJune <me@mrjunejune.com>
parents:
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322
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
323 /* Set/reset protection to allow patching of MCode areas. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
324 MCode *lj_mcode_patch(jit_State *J, MCode *ptr, int finish)
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parents:
diff changeset
325 {
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MrJuneJune <me@mrjunejune.com>
parents:
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326 if (finish) {
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diff changeset
327 #if LUAJIT_SECURITY_MCODE
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
328 if (J->mcarea == ptr)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
329 mcode_protect(J, MCPROT_RUN);
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parents:
diff changeset
330 else if (LJ_UNLIKELY(mcode_setprot(ptr, ((MCLink *)ptr)->size, MCPROT_RUN)))
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MrJuneJune <me@mrjunejune.com>
parents:
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331 mcode_protfail(J);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
332 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
333 return NULL;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
334 } else {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
335 MCode *mc = J->mcarea;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
336 /* Try current area first to use the protection cache. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
337 if (ptr >= mc && ptr < (MCode *)((char *)mc + J->szmcarea)) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
338 #if LUAJIT_SECURITY_MCODE
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
339 mcode_protect(J, MCPROT_GEN);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
340 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
341 return mc;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
342 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
343 /* Otherwise search through the list of MCode areas. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
344 for (;;) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
345 mc = ((MCLink *)mc)->next;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
346 lj_assertJ(mc != NULL, "broken MCode area chain");
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
347 if (ptr >= mc && ptr < (MCode *)((char *)mc + ((MCLink *)mc)->size)) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
348 #if LUAJIT_SECURITY_MCODE
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
349 if (LJ_UNLIKELY(mcode_setprot(mc, ((MCLink *)mc)->size, MCPROT_GEN)))
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
350 mcode_protfail(J);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
351 #endif
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
352 return mc;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
353 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
354 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
355 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
356 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
357
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
358 /* Limit of MCode reservation reached. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
359 void lj_mcode_limiterr(jit_State *J, size_t need)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
360 {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
361 size_t sizemcode, maxmcode;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
362 lj_mcode_abort(J);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
363 sizemcode = (size_t)J->param[JIT_P_sizemcode] << 10;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
364 sizemcode = (sizemcode + LJ_PAGESIZE-1) & ~(size_t)(LJ_PAGESIZE - 1);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
365 maxmcode = (size_t)J->param[JIT_P_maxmcode] << 10;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
366 if ((size_t)need > sizemcode)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
367 lj_trace_err(J, LJ_TRERR_MCODEOV); /* Too long for any area. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
368 if (J->szallmcarea + sizemcode > maxmcode)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
369 lj_trace_err(J, LJ_TRERR_MCODEAL);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
370 mcode_allocarea(J);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
371 lj_trace_err(J, LJ_TRERR_MCODELM); /* Retry with new area. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
372 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
373
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
374 #endif