1 /* 2 * Mesa 3-D graphics library 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 (at) lunarg.com> 26 */ 27 28 #ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY 29 #define HIDDEN __attribute__((visibility("hidden"))) 30 #else 31 #define HIDDEN 32 #endif 33 34 __asm__(".text\n" 35 ".balign 32\n" 36 "x86_64_entry_start:"); 37 38 #define STUB_ASM_ENTRY(func) \ 39 ".globl " func "\n" \ 40 ".type " func ", @function\n" \ 41 ".balign 32\n" \ 42 func ":" 43 44 #ifndef __ILP32__ 45 46 #define STUB_ASM_CODE(slot) \ 47 "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \ 48 "movq %fs:(%rax), %r11\n\t" \ 49 "jmp *(8 * " slot ")(%r11)" 50 51 #else 52 53 #define STUB_ASM_CODE(slot) \ 54 "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \ 55 "movl %fs:(%rax), %r11d\n\t" \ 56 "movl 4*" slot "(%r11d), %r11d\n\t" \ 57 "jmp *%r11" 58 59 #endif 60 61 #define MAPI_TMP_STUB_ASM_GCC 62 #include "mapi_tmp.h" 63 64 #ifndef MAPI_MODE_BRIDGE 65 66 #include <string.h> 67 #include "u_execmem.h" 68 69 void 70 entry_patch_public(void) 71 { 72 } 73 74 extern char 75 x86_64_entry_start[] HIDDEN; 76 77 mapi_func 78 entry_get_public(int slot) 79 { 80 return (mapi_func) (x86_64_entry_start + slot * 32); 81 } 82 83 void 84 entry_patch(mapi_func entry, int slot) 85 { 86 char *code = (char *) entry; 87 int offset = 12; 88 #ifdef __ILP32__ 89 offset = 13; 90 #endif 91 *((unsigned int *) (code + offset)) = slot * sizeof(mapi_func); 92 } 93 94 mapi_func 95 entry_generate(int slot) 96 { 97 const char code_templ[] = { 98 #ifndef __ILP32__ 99 /* movq %fs:0, %r11 */ 100 0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00, 101 /* jmp *0x1234(%r11) */ 102 0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00, 103 #else 104 /* movl %fs:0, %r11d */ 105 0x64, 0x44, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00, 106 /* movl 0x1234(%r11d), %r11d */ 107 0x67, 0x45, 0x8b, 0x9b, 0x34, 0x12, 0x00, 0x00, 108 /* jmp *%r11 */ 109 0x41, 0xff, 0xe3, 110 #endif 111 }; 112 unsigned long long addr; 113 char *code; 114 mapi_func entry; 115 116 __asm__("movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%%rip), %0" 117 : "=r" (addr)); 118 if ((addr >> 32) != 0xffffffff) 119 return NULL; 120 addr &= 0xffffffff; 121 122 code = u_execmem_alloc(sizeof(code_templ)); 123 if (!code) 124 return NULL; 125 126 memcpy(code, code_templ, sizeof(code_templ)); 127 128 *((unsigned int *) (code + 5)) = addr; 129 entry = (mapi_func) code; 130 entry_patch(entry, slot); 131 132 return entry; 133 } 134 135 #endif /* MAPI_MODE_BRIDGE */ 136
