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Rev | Author | Line No. | Line |
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4358 | Serge | 1 | /* |
2 | * Mesa 3-D graphics library |
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3 | * |
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4 | * Copyright (C) 2010 LunarG Inc. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the "Software"), |
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8 | * to deal in the Software without restriction, including without limitation |
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9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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10 | * and/or sell copies of the Software, and to permit persons to whom the |
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11 | * Software is furnished to do so, subject to the following conditions: |
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12 | * |
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13 | * The above copyright notice and this permission notice shall be included |
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14 | * in all copies or substantial portions of the Software. |
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15 | * |
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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21 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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22 | * DEALINGS IN THE SOFTWARE. |
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23 | * |
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24 | * Authors: |
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25 | * Chia-I Wu |
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26 | */ |
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27 | |||
28 | #include |
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29 | #include "u_macros.h" |
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30 | |||
31 | __asm__(".text"); |
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32 | |||
33 | __asm__("x86_current_tls:\n\t" |
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34 | "call 1f\n" |
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35 | "1:\n\t" |
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36 | "popl %eax\n\t" |
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37 | "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" |
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38 | "movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t" |
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39 | "ret"); |
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40 | |||
41 | #ifndef GLX_X86_READONLY_TEXT |
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42 | __asm__(".section wtext, \"awx\", @progbits"); |
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43 | #endif /* GLX_X86_READONLY_TEXT */ |
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44 | |||
45 | __asm__(".balign 16\n" |
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46 | "x86_entry_start:"); |
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47 | |||
48 | #define STUB_ASM_ENTRY(func) \ |
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49 | ".globl " func "\n" \ |
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50 | ".type " func ", @function\n" \ |
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51 | ".balign 16\n" \ |
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52 | func ":" |
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53 | |||
54 | #define STUB_ASM_CODE(slot) \ |
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55 | "call x86_current_tls\n\t" \ |
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56 | "movl %gs:(%eax), %eax\n\t" \ |
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57 | "jmp *(4 * " slot ")(%eax)" |
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58 | |||
59 | #define MAPI_TMP_STUB_ASM_GCC |
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60 | #include "mapi_tmp.h" |
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61 | |||
62 | #ifndef GLX_X86_READONLY_TEXT |
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63 | __asm__(".balign 16\n" |
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64 | "x86_entry_end:"); |
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65 | __asm__(".text"); |
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66 | #endif /* GLX_X86_READONLY_TEXT */ |
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67 | |||
68 | #ifndef MAPI_MODE_BRIDGE |
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69 | |||
70 | #include "u_execmem.h" |
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71 | |||
72 | extern unsigned long |
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73 | x86_current_tls(); |
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74 | |||
75 | static char x86_entry_start[]; |
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76 | static char x86_entry_end[]; |
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77 | |||
78 | void |
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79 | entry_patch_public(void) |
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80 | { |
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81 | #ifndef GLX_X86_READONLY_TEXT |
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82 | char patch[8] = { |
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83 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
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84 | 0x90, 0x90 /* nop's */ |
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85 | }; |
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86 | char *entry; |
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87 | |||
88 | *((unsigned long *) (patch + 2)) = x86_current_tls(); |
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89 | |||
90 | for (entry = x86_entry_start; entry < x86_entry_end; entry += 16) |
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91 | memcpy(entry, patch, sizeof(patch)); |
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92 | #endif |
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93 | } |
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94 | |||
95 | mapi_func |
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96 | entry_get_public(int slot) |
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97 | { |
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98 | return (mapi_func) (x86_entry_start + slot * 16); |
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99 | } |
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100 | |||
101 | void |
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102 | entry_patch(mapi_func entry, int slot) |
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103 | { |
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104 | char *code = (char *) entry; |
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105 | *((unsigned long *) (code + 8)) = slot * sizeof(mapi_func); |
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106 | } |
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107 | |||
108 | mapi_func |
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109 | entry_generate(int slot) |
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110 | { |
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111 | const char code_templ[16] = { |
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112 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
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113 | 0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */ |
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114 | 0x90, 0x90, 0x90, 0x90 /* nop's */ |
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115 | }; |
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116 | void *code; |
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117 | mapi_func entry; |
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118 | |||
119 | code = u_execmem_alloc(sizeof(code_templ)); |
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120 | if (!code) |
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121 | return NULL; |
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122 | |||
123 | memcpy(code, code_templ, sizeof(code_templ)); |
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124 | |||
125 | *((unsigned long *) (code + 2)) = x86_current_tls(); |
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126 | entry = (mapi_func) code; |
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127 | entry_patch(entry, slot); |
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128 | |||
129 | return entry; |
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130 | } |
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131 | |||
132 | #endif /* MAPI_MODE_BRIDGE */> |