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Diffstat (limited to 'src/mapi/entry_x86_tls.h')
| -rw-r--r-- | src/mapi/entry_x86_tls.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/mapi/entry_x86_tls.h b/src/mapi/entry_x86_tls.h new file mode 100644 index 0000000000..de918128ee --- /dev/null +++ b/src/mapi/entry_x86_tls.h @@ -0,0 +1,146 @@ +/* + * Mesa 3-D graphics library + * Version: 7.9 + * + * 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> +#include "u_macros.h" + +#ifdef __linux__ +__asm__(".section .note.ABI-tag, \"a\"\n\t" + ".p2align 2\n\t" + ".long 1f - 0f\n\t" /* name length */ + ".long 3f - 2f\n\t" /* data length */ + ".long 1\n\t" /* note length */ + "0: .asciz \"GNU\"\n\t" /* vendor name */ + "1: .p2align 2\n\t" + "2: .long 0\n\t" /* note data: the ABI tag */ + ".long 2,4,20\n\t" /* Minimum kernel version w/TLS */ + "3: .p2align 2\n\t"); /* pad out section */ +#endif /* __linux__ */ + +__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 */ + }; + void *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 */ |