/* * 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 "u_macros.h" __asm__(".text\n" ".balign 32\n" "x86_64_entry_start:"); #define STUB_ASM_ENTRY(func) \ ".globl " func "\n" \ ".type " func ", @function\n" \ ".balign 32\n" \ func ":" #define STUB_ASM_CODE(slot) \ "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \ "movq %fs:(%rax), %r11\n\t" \ "jmp *(8 * " slot ")(%r11)" #define MAPI_TMP_STUB_ASM_GCC #include "mapi_tmp.h" #ifndef MAPI_MODE_BRIDGE __asm__("x86_64_current_tls:\n\t" "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" "ret"); extern unsigned long x86_64_current_tls(); #include <string.h> #include "u_execmem.h" void entry_patch_public(void) { } static char x86_64_entry_start[]; mapi_func entry_get_public(int slot) { return (mapi_func) (x86_64_entry_start + slot * 32); } void entry_patch(mapi_func entry, int slot) { char *code = (char *) entry; *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func); } mapi_func entry_generate(int slot) { const char code_templ[16] = { /* movq %fs:0, %r11 */ 0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00, /* jmp *0x1234(%r11) */ 0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00, }; unsigned long addr; void *code; mapi_func entry; addr = x86_64_current_tls(); if ((addr >> 32) != 0xffffffff) return NULL; addr &= 0xffffffff; code = u_execmem_alloc(sizeof(code_templ)); if (!code) return NULL; memcpy(code, code_templ, sizeof(code_templ)); *((unsigned int *) (code + 5)) = addr; entry = (mapi_func) code; entry_patch(entry, slot); return entry; } #endif /* MAPI_MODE_BRIDGE */