/* * Mesa 3-D graphics library * * Copyright (C) 2010 LunarG Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Authors: * Chia-I Wu <olv@lunarg.com> */ #include <string.h> __asm__(".text"); __asm__("x86_current_tls:\n\t" "call 1f\n" "1:\n\t" "popl %eax\n\t" "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" "movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t" "ret"); #ifndef GLX_X86_READONLY_TEXT __asm__(".section wtext, \"awx\", @progbits"); #endif /* GLX_X86_READONLY_TEXT */ __asm__(".balign 16\n" "x86_entry_start:"); #define STUB_ASM_ENTRY(func) \ ".globl " func "\n" \ ".type " func ", @function\n" \ ".balign 16\n" \ func ":" #define STUB_ASM_CODE(slot) \ "call x86_current_tls\n\t" \ "movl %gs:(%eax), %eax\n\t" \ "jmp *(4 * " slot ")(%eax)" #define MAPI_TMP_STUB_ASM_GCC #include "mapi_tmp.h" #ifndef GLX_X86_READONLY_TEXT __asm__(".balign 16\n" "x86_entry_end:"); __asm__(".text"); #endif /* GLX_X86_READONLY_TEXT */ #ifndef MAPI_MODE_BRIDGE #include "u_execmem.h" extern unsigned long x86_current_tls(); static char x86_entry_start[]; static char x86_entry_end[]; void entry_patch_public(void) { #ifndef GLX_X86_READONLY_TEXT char patch[8] = { 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ 0x90, 0x90 /* nop's */ }; char *entry; *((unsigned long *) (patch + 2)) = x86_current_tls(); for (entry = x86_entry_start; entry < x86_entry_end; entry += 16) memcpy(entry, patch, sizeof(patch)); #endif } mapi_func entry_get_public(int slot) { return (mapi_func) (x86_entry_start + slot * 16); } void entry_patch(mapi_func entry, int slot) { char *code = (char *) entry; *((unsigned long *) (code + 8)) = slot * sizeof(mapi_func); } mapi_func entry_generate(int slot) { const char code_templ[16] = { 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */ 0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */ 0x90, 0x90, 0x90, 0x90 /* nop's */ }; char *code; mapi_func entry; code = u_execmem_alloc(sizeof(code_templ)); if (!code) return NULL; memcpy(code, code_templ, sizeof(code_templ)); *((unsigned long *) (code + 2)) = x86_current_tls(); entry = (mapi_func) code; entry_patch(entry, slot); return entry; } #endif /* MAPI_MODE_BRIDGE */