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annotate third_party/luajit/dynasm/dasm_mips.h @ 279:b3b547563ec7
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> |
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| date | Mon, 17 Aug 2026 22:22:36 -0700 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* |
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2 ** DynASM MIPS encoding engine. |
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3 ** Copyright (C) 2005-2023 Mike Pall. All rights reserved. |
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4 ** Released under the MIT license. See dynasm.lua for full copyright notice. |
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5 */ |
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6 |
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7 #include <stddef.h> |
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8 #include <stdarg.h> |
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9 #include <string.h> |
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10 #include <stdlib.h> |
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11 |
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12 #define DASM_ARCH "mips" |
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13 |
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14 #ifndef DASM_EXTERN |
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15 #define DASM_EXTERN(a,b,c,d) 0 |
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16 #endif |
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17 |
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18 /* Action definitions. */ |
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19 enum { |
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20 DASM_STOP, DASM_SECTION, DASM_ESC, DASM_REL_EXT, |
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21 /* The following actions need a buffer position. */ |
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22 DASM_ALIGN, DASM_REL_LG, DASM_LABEL_LG, |
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23 /* The following actions also have an argument. */ |
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24 DASM_REL_PC, DASM_LABEL_PC, DASM_IMM, DASM_IMMS, |
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25 DASM__MAX |
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26 }; |
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27 |
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28 /* Maximum number of section buffer positions for a single dasm_put() call. */ |
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29 #define DASM_MAXSECPOS 25 |
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30 |
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31 /* DynASM encoder status codes. Action list offset or number are or'ed in. */ |
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32 #define DASM_S_OK 0x00000000 |
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33 #define DASM_S_NOMEM 0x01000000 |
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34 #define DASM_S_PHASE 0x02000000 |
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35 #define DASM_S_MATCH_SEC 0x03000000 |
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36 #define DASM_S_RANGE_I 0x11000000 |
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37 #define DASM_S_RANGE_SEC 0x12000000 |
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38 #define DASM_S_RANGE_LG 0x13000000 |
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39 #define DASM_S_RANGE_PC 0x14000000 |
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40 #define DASM_S_RANGE_REL 0x15000000 |
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41 #define DASM_S_UNDEF_LG 0x21000000 |
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42 #define DASM_S_UNDEF_PC 0x22000000 |
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43 |
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44 /* Macros to convert positions (8 bit section + 24 bit index). */ |
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45 #define DASM_POS2IDX(pos) ((pos)&0x00ffffff) |
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46 #define DASM_POS2BIAS(pos) ((pos)&0xff000000) |
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47 #define DASM_SEC2POS(sec) ((sec)<<24) |
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48 #define DASM_POS2SEC(pos) ((pos)>>24) |
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49 #define DASM_POS2PTR(D, pos) (D->sections[DASM_POS2SEC(pos)].rbuf + (pos)) |
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50 |
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51 /* Action list type. */ |
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52 typedef const unsigned int *dasm_ActList; |
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53 |
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54 /* Per-section structure. */ |
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55 typedef struct dasm_Section { |
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56 int *rbuf; /* Biased buffer pointer (negative section bias). */ |
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57 int *buf; /* True buffer pointer. */ |
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58 size_t bsize; /* Buffer size in bytes. */ |
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59 int pos; /* Biased buffer position. */ |
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60 int epos; /* End of biased buffer position - max single put. */ |
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61 int ofs; /* Byte offset into section. */ |
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62 } dasm_Section; |
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63 |
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64 /* Core structure holding the DynASM encoding state. */ |
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65 struct dasm_State { |
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66 size_t psize; /* Allocated size of this structure. */ |
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67 dasm_ActList actionlist; /* Current actionlist pointer. */ |
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68 int *lglabels; /* Local/global chain/pos ptrs. */ |
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69 size_t lgsize; |
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70 int *pclabels; /* PC label chains/pos ptrs. */ |
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71 size_t pcsize; |
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72 void **globals; /* Array of globals. */ |
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73 dasm_Section *section; /* Pointer to active section. */ |
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74 size_t codesize; /* Total size of all code sections. */ |
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75 int maxsection; /* 0 <= sectionidx < maxsection. */ |
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76 int status; /* Status code. */ |
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77 dasm_Section sections[1]; /* All sections. Alloc-extended. */ |
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78 }; |
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79 |
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80 /* The size of the core structure depends on the max. number of sections. */ |
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81 #define DASM_PSZ(ms) (sizeof(dasm_State)+(ms-1)*sizeof(dasm_Section)) |
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82 |
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83 |
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84 /* Initialize DynASM state. */ |
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85 void dasm_init(Dst_DECL, int maxsection) |
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86 { |
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87 dasm_State *D; |
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88 size_t psz = 0; |
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89 Dst_REF = NULL; |
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90 DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection)); |
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91 D = Dst_REF; |
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92 D->psize = psz; |
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93 D->lglabels = NULL; |
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94 D->lgsize = 0; |
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95 D->pclabels = NULL; |
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96 D->pcsize = 0; |
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97 D->globals = NULL; |
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98 D->maxsection = maxsection; |
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99 memset((void *)D->sections, 0, maxsection * sizeof(dasm_Section)); |
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100 } |
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101 |
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102 /* Free DynASM state. */ |
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103 void dasm_free(Dst_DECL) |
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104 { |
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105 dasm_State *D = Dst_REF; |
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106 int i; |
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107 for (i = 0; i < D->maxsection; i++) |
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parents:
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changeset
|
108 if (D->sections[i].buf) |
|
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parents:
diff
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|
109 DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize); |
|
94705b5986b3
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diff
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|
110 if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize); |
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94705b5986b3
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parents:
diff
changeset
|
111 if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize); |
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94705b5986b3
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parents:
diff
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|
112 DASM_M_FREE(Dst, D, D->psize); |
|
94705b5986b3
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113 } |
|
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parents:
diff
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|
114 |
|
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parents:
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|
115 /* Setup global label array. Must be called before dasm_setup(). */ |
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parents:
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116 void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl) |
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117 { |
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118 dasm_State *D = Dst_REF; |
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119 D->globals = gl; |
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parents:
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120 DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int)); |
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121 } |
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122 |
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parents:
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|
123 /* Grow PC label array. Can be called after dasm_setup(), too. */ |
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parents:
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124 void dasm_growpc(Dst_DECL, unsigned int maxpc) |
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parents:
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125 { |
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126 dasm_State *D = Dst_REF; |
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127 size_t osz = D->pcsize; |
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128 DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int)); |
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129 memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz); |
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130 } |
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131 |
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132 /* Setup encoder. */ |
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133 void dasm_setup(Dst_DECL, const void *actionlist) |
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134 { |
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135 dasm_State *D = Dst_REF; |
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136 int i; |
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137 D->actionlist = (dasm_ActList)actionlist; |
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138 D->status = DASM_S_OK; |
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139 D->section = &D->sections[0]; |
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parents:
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140 memset((void *)D->lglabels, 0, D->lgsize); |
|
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parents:
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141 if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize); |
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parents:
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142 for (i = 0; i < D->maxsection; i++) { |
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parents:
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143 D->sections[i].pos = DASM_SEC2POS(i); |
|
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parents:
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144 D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos; |
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parents:
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145 D->sections[i].ofs = 0; |
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146 } |
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147 } |
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148 |
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149 |
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parents:
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|
150 #ifdef DASM_CHECKS |
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151 #define CK(x, st) \ |
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152 do { if (!(x)) { \ |
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153 D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0) |
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154 #define CKPL(kind, st) \ |
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155 do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { \ |
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parents:
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156 D->status = DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0) |
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parents:
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157 #else |
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158 #define CK(x, st) ((void)0) |
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159 #define CKPL(kind, st) ((void)0) |
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160 #endif |
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161 |
|
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parents:
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|
162 /* Pass 1: Store actions and args, link branches/labels, estimate offsets. */ |
|
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parents:
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163 void dasm_put(Dst_DECL, int start, ...) |
|
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164 { |
|
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165 va_list ap; |
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166 dasm_State *D = Dst_REF; |
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parents:
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|
167 dasm_ActList p = D->actionlist + start; |
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parents:
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168 dasm_Section *sec = D->section; |
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parents:
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169 int pos = sec->pos, ofs = sec->ofs; |
|
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parents:
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|
170 int *b; |
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parents:
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171 |
|
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parents:
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|
172 if (pos >= sec->epos) { |
|
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parents:
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|
173 DASM_M_GROW(Dst, int, sec->buf, sec->bsize, |
|
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parents:
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174 sec->bsize + 2*DASM_MAXSECPOS*sizeof(int)); |
|
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parents:
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175 sec->rbuf = sec->buf - DASM_POS2BIAS(pos); |
|
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parents:
diff
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|
176 sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos); |
|
94705b5986b3
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parents:
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|
177 } |
|
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parents:
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178 |
|
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parents:
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|
179 b = sec->rbuf; |
|
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parents:
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180 b[pos++] = start; |
|
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parents:
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|
181 |
|
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parents:
diff
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|
182 va_start(ap, start); |
|
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parents:
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|
183 while (1) { |
|
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parents:
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|
184 unsigned int ins = *p++; |
|
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parents:
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185 unsigned int action = (ins >> 16) - 0xff00; |
|
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parents:
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|
186 if (action >= DASM__MAX) { |
|
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parents:
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187 ofs += 4; |
|
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parents:
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|
188 } else { |
|
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parents:
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189 int *pl, n = action >= DASM_REL_PC ? va_arg(ap, int) : 0; |
|
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parents:
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|
190 switch (action) { |
|
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parents:
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|
191 case DASM_STOP: goto stop; |
|
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parents:
diff
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|
192 case DASM_SECTION: |
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parents:
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193 n = (ins & 255); CK(n < D->maxsection, RANGE_SEC); |
|
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parents:
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|
194 D->section = &D->sections[n]; goto stop; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
195 case DASM_ESC: p++; ofs += 4; break; |
|
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parents:
diff
changeset
|
196 case DASM_REL_EXT: break; |
|
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parents:
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197 case DASM_ALIGN: ofs += (ins & 255); b[pos++] = ofs; break; |
|
94705b5986b3
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parents:
diff
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|
198 case DASM_REL_LG: |
|
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parents:
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199 n = (ins & 2047) - 10; pl = D->lglabels + n; |
|
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parents:
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|
200 /* Bkwd rel or global. */ |
|
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parents:
diff
changeset
|
201 if (n >= 0) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
202 pl += 10; n = *pl; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
203 if (n < 0) n = 0; /* Start new chain for fwd rel if label exists. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
204 goto linkrel; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
205 case DASM_REL_PC: |
|
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parents:
diff
changeset
|
206 pl = D->pclabels + n; CKPL(pc, PC); |
|
94705b5986b3
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parents:
diff
changeset
|
207 putrel: |
|
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parents:
diff
changeset
|
208 n = *pl; |
|
94705b5986b3
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parents:
diff
changeset
|
209 if (n < 0) { /* Label exists. Get label pos and store it. */ |
|
94705b5986b3
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parents:
diff
changeset
|
210 b[pos] = -n; |
|
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parents:
diff
changeset
|
211 } else { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
212 linkrel: |
|
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[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
213 b[pos] = n; /* Else link to rel chain, anchored at label. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
214 *pl = pos; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
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215 } |
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216 pos++; |
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217 break; |
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218 case DASM_LABEL_LG: |
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219 pl = D->lglabels + (ins & 2047) - 10; CKPL(lg, LG); goto putlabel; |
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220 case DASM_LABEL_PC: |
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221 pl = D->pclabels + n; CKPL(pc, PC); |
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222 putlabel: |
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223 n = *pl; /* n > 0: Collapse rel chain and replace with label pos. */ |
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224 while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; |
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225 } |
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226 *pl = -pos; /* Label exists now. */ |
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227 b[pos++] = ofs; /* Store pass1 offset estimate. */ |
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228 break; |
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229 case DASM_IMM: case DASM_IMMS: |
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230 #ifdef DASM_CHECKS |
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231 CK((n & ((1<<((ins>>10)&31))-1)) == 0, RANGE_I); |
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232 #endif |
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233 n >>= ((ins>>10)&31); |
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234 #ifdef DASM_CHECKS |
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235 if (ins & 0x8000) |
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236 CK(((n + (1<<(((ins>>5)&31)-1)))>>((ins>>5)&31)) == 0, RANGE_I); |
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237 else |
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238 CK((n>>((ins>>5)&31)) == 0, RANGE_I); |
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239 #endif |
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240 b[pos++] = n; |
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241 break; |
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242 } |
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243 } |
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244 } |
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245 stop: |
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246 va_end(ap); |
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247 sec->pos = pos; |
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248 sec->ofs = ofs; |
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249 } |
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250 #undef CK |
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251 |
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252 /* Pass 2: Link sections, shrink aligns, fix label offsets. */ |
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253 int dasm_link(Dst_DECL, size_t *szp) |
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254 { |
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255 dasm_State *D = Dst_REF; |
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256 int secnum; |
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257 int ofs = 0; |
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258 |
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259 #ifdef DASM_CHECKS |
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260 *szp = 0; |
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261 if (D->status != DASM_S_OK) return D->status; |
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262 { |
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263 int pc; |
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264 for (pc = 0; pc*sizeof(int) < D->pcsize; pc++) |
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265 if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc; |
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266 } |
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267 #endif |
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268 |
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269 { /* Handle globals not defined in this translation unit. */ |
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270 int idx; |
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271 for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) { |
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272 int n = D->lglabels[idx]; |
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273 /* Undefined label: Collapse rel chain and replace with marker (< 0). */ |
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274 while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; } |
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275 } |
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276 } |
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277 |
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278 /* Combine all code sections. No support for data sections (yet). */ |
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279 for (secnum = 0; secnum < D->maxsection; secnum++) { |
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280 dasm_Section *sec = D->sections + secnum; |
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281 int *b = sec->rbuf; |
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282 int pos = DASM_SEC2POS(secnum); |
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283 int lastpos = sec->pos; |
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284 |
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285 while (pos != lastpos) { |
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286 dasm_ActList p = D->actionlist + b[pos++]; |
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287 while (1) { |
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288 unsigned int ins = *p++; |
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289 unsigned int action = (ins >> 16) - 0xff00; |
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290 switch (action) { |
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291 case DASM_STOP: case DASM_SECTION: goto stop; |
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292 case DASM_ESC: p++; break; |
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293 case DASM_REL_EXT: break; |
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294 case DASM_ALIGN: ofs -= (b[pos++] + ofs) & (ins & 255); break; |
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295 case DASM_REL_LG: case DASM_REL_PC: pos++; break; |
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296 case DASM_LABEL_LG: case DASM_LABEL_PC: b[pos++] += ofs; break; |
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297 case DASM_IMM: case DASM_IMMS: pos++; break; |
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298 } |
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299 } |
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300 stop: (void)0; |
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301 } |
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302 ofs += sec->ofs; /* Next section starts right after current section. */ |
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303 } |
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304 |
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305 D->codesize = ofs; /* Total size of all code sections */ |
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306 *szp = ofs; |
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307 return DASM_S_OK; |
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308 } |
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309 |
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|
310 #ifdef DASM_CHECKS |
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311 #define CK(x, st) \ |
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312 do { if (!(x)) return DASM_S_##st|(int)(p-D->actionlist-1); } while (0) |
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313 #else |
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314 #define CK(x, st) ((void)0) |
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315 #endif |
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316 |
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parents:
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317 /* Pass 3: Encode sections. */ |
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318 int dasm_encode(Dst_DECL, void *buffer) |
|
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319 { |
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320 dasm_State *D = Dst_REF; |
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321 char *base = (char *)buffer; |
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322 unsigned int *cp = (unsigned int *)buffer; |
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323 int secnum; |
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324 |
|
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parents:
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325 /* Encode all code sections. No support for data sections (yet). */ |
|
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parents:
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326 for (secnum = 0; secnum < D->maxsection; secnum++) { |
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327 dasm_Section *sec = D->sections + secnum; |
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328 int *b = sec->buf; |
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329 int *endb = sec->rbuf + sec->pos; |
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330 |
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parents:
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331 while (b != endb) { |
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332 dasm_ActList p = D->actionlist + *b++; |
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333 while (1) { |
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334 unsigned int ins = *p++; |
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335 unsigned int action = (ins >> 16) - 0xff00; |
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336 int n = (action >= DASM_ALIGN && action < DASM__MAX) ? *b++ : 0; |
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337 switch (action) { |
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338 case DASM_STOP: case DASM_SECTION: goto stop; |
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339 case DASM_ESC: *cp++ = *p++; break; |
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340 case DASM_REL_EXT: |
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341 n = DASM_EXTERN(Dst, (unsigned char *)cp, (ins & 2047), 1); |
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342 goto patchrel; |
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343 case DASM_ALIGN: |
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344 ins &= 255; while ((((char *)cp - base) & ins)) *cp++ = 0x60000000; |
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345 break; |
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346 case DASM_REL_LG: |
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347 if (n < 0) { |
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348 n = (int)((ptrdiff_t)D->globals[-n-10] - (ptrdiff_t)cp); |
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349 goto patchrel; |
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350 } |
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351 /* fallthrough */ |
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352 case DASM_REL_PC: |
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353 CK(n >= 0, UNDEF_PC); |
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354 n = *DASM_POS2PTR(D, n); |
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355 if (ins & 2048) |
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356 n = (n + (int)(size_t)base) & 0x0fffffff; |
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357 else |
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358 n = n - (int)((char *)cp - base); |
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359 patchrel: { |
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360 unsigned int e = 16 + ((ins >> 12) & 15); |
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361 CK((n & 3) == 0 && |
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362 ((n + ((ins & 2048) ? 0 : (1<<(e+1)))) >> (e+2)) == 0, RANGE_REL); |
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363 cp[-1] |= ((n>>2) & ((1<<e)-1)); |
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364 } |
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365 break; |
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parents:
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366 case DASM_LABEL_LG: |
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367 ins &= 2047; if (ins >= 20) D->globals[ins-20] = (void *)(base + n); |
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368 break; |
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369 case DASM_LABEL_PC: break; |
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370 case DASM_IMMS: |
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371 cp[-1] |= ((n>>3) & 4); n &= 0x1f; |
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372 /* fallthrough */ |
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373 case DASM_IMM: |
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374 cp[-1] |= (n & ((1<<((ins>>5)&31))-1)) << (ins&31); |
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375 break; |
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376 default: *cp++ = ins; break; |
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377 } |
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378 } |
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379 stop: (void)0; |
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380 } |
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381 } |
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parents:
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|
382 |
|
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parents:
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|
383 if (base + D->codesize != (char *)cp) /* Check for phase errors. */ |
|
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384 return DASM_S_PHASE; |
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385 return DASM_S_OK; |
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386 } |
|
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parents:
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|
387 #undef CK |
|
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parents:
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|
388 |
|
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parents:
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|
389 /* Get PC label offset. */ |
|
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parents:
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|
390 int dasm_getpclabel(Dst_DECL, unsigned int pc) |
|
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parents:
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391 { |
|
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parents:
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392 dasm_State *D = Dst_REF; |
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parents:
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393 if (pc*sizeof(int) < D->pcsize) { |
|
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parents:
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394 int pos = D->pclabels[pc]; |
|
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parents:
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395 if (pos < 0) return *DASM_POS2PTR(D, -pos); |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
396 if (pos > 0) return -1; /* Undefined. */ |
|
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parents:
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|
397 } |
|
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parents:
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|
398 return -2; /* Unused or out of range. */ |
|
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parents:
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|
399 } |
|
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parents:
diff
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|
400 |
|
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parents:
diff
changeset
|
401 #ifdef DASM_CHECKS |
|
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parents:
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|
402 /* Optional sanity checker to call between isolated encoding steps. */ |
|
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parents:
diff
changeset
|
403 int dasm_checkstep(Dst_DECL, int secmatch) |
|
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parents:
diff
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|
404 { |
|
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parents:
diff
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|
405 dasm_State *D = Dst_REF; |
|
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parents:
diff
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|
406 if (D->status == DASM_S_OK) { |
|
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parents:
diff
changeset
|
407 int i; |
|
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parents:
diff
changeset
|
408 for (i = 1; i <= 9; i++) { |
|
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parents:
diff
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|
409 if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_LG|i; break; } |
|
94705b5986b3
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parents:
diff
changeset
|
410 D->lglabels[i] = 0; |
|
94705b5986b3
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parents:
diff
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|
411 } |
|
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parents:
diff
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|
412 } |
|
94705b5986b3
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parents:
diff
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|
413 if (D->status == DASM_S_OK && secmatch >= 0 && |
|
94705b5986b3
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parents:
diff
changeset
|
414 D->section != &D->sections[secmatch]) |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
415 D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections); |
|
94705b5986b3
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parents:
diff
changeset
|
416 return D->status; |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
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|
417 } |
|
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parents:
diff
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|
418 #endif |
|
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parents:
diff
changeset
|
419 |