Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Mesa 3-D graphics library |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2010 LunarG Inc. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included |
| 14 | * in all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 21 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 22 | * DEALINGS IN THE SOFTWARE. |
| 23 | * |
| 24 | * Authors: |
| 25 | * Chia-I Wu <olv@lunarg.com> |
| 26 | */ |
| 27 | |
| 28 | #include <string.h> |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 29 | #include "u_macros.h" |
| 30 | |
| 31 | __asm__(".text"); |
| 32 | |
| 33 | __asm__("x86_current_tls:\n\t" |
| 34 | "call 1f\n" |
| 35 | "1:\n\t" |
| 36 | "popl %eax\n\t" |
| 37 | "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" |
Chia-I Wu | 96c52d1 | 2010-08-24 15:51:57 +0800 | [diff] [blame] | 38 | "movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t" |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 39 | "ret"); |
| 40 | |
| 41 | #ifndef GLX_X86_READONLY_TEXT |
Chia-I Wu | e6a7ef3 | 2010-12-24 15:06:41 +0800 | [diff] [blame] | 42 | __asm__(".section wtext, \"awx\", @progbits"); |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 43 | #endif /* GLX_X86_READONLY_TEXT */ |
| 44 | |
Chia-I Wu | e6a7ef3 | 2010-12-24 15:06:41 +0800 | [diff] [blame] | 45 | __asm__(".balign 16\n" |
| 46 | "x86_entry_start:"); |
| 47 | |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 48 | #define STUB_ASM_ENTRY(func) \ |
| 49 | ".globl " func "\n" \ |
| 50 | ".type " func ", @function\n" \ |
| 51 | ".balign 16\n" \ |
| 52 | func ":" |
| 53 | |
| 54 | #define STUB_ASM_CODE(slot) \ |
| 55 | "call x86_current_tls\n\t" \ |
| 56 | "movl %gs:(%eax), %eax\n\t" \ |
| 57 | "jmp *(4 * " slot ")(%eax)" |
| 58 | |
| 59 | #define MAPI_TMP_STUB_ASM_GCC |
| 60 | #include "mapi_tmp.h" |
| 61 | |
| 62 | #ifndef GLX_X86_READONLY_TEXT |
| 63 | __asm__(".balign 16\n" |
| 64 | "x86_entry_end:"); |
| 65 | __asm__(".text"); |
| 66 | #endif /* GLX_X86_READONLY_TEXT */ |
| 67 | |
Chia-I Wu | 97185bf | 2010-12-17 00:24:27 +0800 | [diff] [blame] | 68 | #ifndef MAPI_MODE_BRIDGE |
| 69 | |
| 70 | #include "u_execmem.h" |
| 71 | |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 72 | extern unsigned long |
| 73 | x86_current_tls(); |
| 74 | |
Chia-I Wu | 77b7e1b | 2011-06-13 11:41:41 +0800 | [diff] [blame] | 75 | static char x86_entry_start[]; |
| 76 | static char x86_entry_end[]; |
| 77 | |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 78 | void |
| 79 | entry_patch_public(void) |
| 80 | { |
| 81 | #ifndef GLX_X86_READONLY_TEXT |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 82 | char patch[8] = { |
| 83 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
| 84 | 0x90, 0x90 /* nop's */ |
| 85 | }; |
| 86 | char *entry; |
| 87 | |
| 88 | *((unsigned long *) (patch + 2)) = x86_current_tls(); |
| 89 | |
| 90 | for (entry = x86_entry_start; entry < x86_entry_end; entry += 16) |
| 91 | memcpy(entry, patch, sizeof(patch)); |
| 92 | #endif |
| 93 | } |
| 94 | |
Chia-I Wu | e6a7ef3 | 2010-12-24 15:06:41 +0800 | [diff] [blame] | 95 | mapi_func |
| 96 | entry_get_public(int slot) |
| 97 | { |
Chia-I Wu | e6a7ef3 | 2010-12-24 15:06:41 +0800 | [diff] [blame] | 98 | return (mapi_func) (x86_entry_start + slot * 16); |
| 99 | } |
| 100 | |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 101 | void |
| 102 | entry_patch(mapi_func entry, int slot) |
| 103 | { |
Chia-I Wu | ebeb4a7 | 2010-09-30 17:09:59 +0800 | [diff] [blame] | 104 | char *code = (char *) entry; |
Chia-I Wu | 56eb5d7 | 2010-04-22 15:33:43 +0800 | [diff] [blame] | 105 | *((unsigned long *) (code + 8)) = slot * sizeof(mapi_func); |
| 106 | } |
| 107 | |
| 108 | mapi_func |
| 109 | entry_generate(int slot) |
| 110 | { |
| 111 | const char code_templ[16] = { |
| 112 | 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ |
| 113 | 0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */ |
| 114 | 0x90, 0x90, 0x90, 0x90 /* nop's */ |
| 115 | }; |
| 116 | void *code; |
| 117 | mapi_func entry; |
| 118 | |
| 119 | code = u_execmem_alloc(sizeof(code_templ)); |
| 120 | if (!code) |
| 121 | return NULL; |
| 122 | |
| 123 | memcpy(code, code_templ, sizeof(code_templ)); |
| 124 | |
| 125 | *((unsigned long *) (code + 2)) = x86_current_tls(); |
| 126 | entry = (mapi_func) code; |
| 127 | entry_patch(entry, slot); |
| 128 | |
| 129 | return entry; |
| 130 | } |
Chia-I Wu | 97185bf | 2010-12-17 00:24:27 +0800 | [diff] [blame] | 131 | |
| 132 | #endif /* MAPI_MODE_BRIDGE */ |