1/* 2 * Mesa 3-D graphics library 3 * Version: 7.9 4 * 5 * Copyright (C) 2010 LunarG Inc. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included 15 * in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 * DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: 26 * Chia-I Wu <olv@lunarg.com> 27 */ 28 29#include "u_macros.h" 30 31#define X86_ENTRY_SIZE 32 32 33__asm__(".text\n" 34 ".balign 32\n" 35 "x86_entry_start:"); 36 37#define STUB_ASM_ENTRY(func) \ 38 ".globl " func "\n" \ 39 ".type " func ", @function\n" \ 40 ".balign 32\n" \ 41 func ":" 42 43#define STUB_ASM_CODE(slot) \ 44 "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \ 45 "testl %eax, %eax\n\t" \ 46 "je 1f\n\t" \ 47 "jmp *(4 * " slot ")(%eax)\n" \ 48 "1:\n\t" \ 49 "call " ENTRY_CURRENT_TABLE_GET "\n\t" \ 50 "jmp *(4 * " slot ")(%eax)" 51 52#define MAPI_TMP_STUB_ASM_GCC 53#include "mapi_tmp.h" 54 55#ifndef MAPI_MODE_BRIDGE 56 57__asm__(".balign 32\n" 58 "x86_entry_end:"); 59 60#include <string.h> 61#include "u_execmem.h" 62 63static const char x86_entry_start[]; 64static const char x86_entry_end[]; 65 66void 67entry_patch_public(void) 68{ 69} 70 71mapi_func 72entry_get_public(int slot) 73{ 74 return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE); 75} 76 77void 78entry_patch(mapi_func entry, int slot) 79{ 80 char *code = (char *) entry; 81 82 *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func); 83 *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func); 84} 85 86mapi_func 87entry_generate(int slot) 88{ 89 const char *code_templ = x86_entry_end - X86_ENTRY_SIZE; 90 void *code; 91 mapi_func entry; 92 93 code = u_execmem_alloc(X86_ENTRY_SIZE); 94 if (!code) 95 return NULL; 96 97 memcpy(code, code_templ, X86_ENTRY_SIZE); 98 entry = (mapi_func) code; 99 entry_patch(entry, slot); 100 101 return entry; 102} 103 104#endif /* MAPI_MODE_BRIDGE */ 105