144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2010 LunarG Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Chia-I Wu <olv@lunarg.com>
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*/
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#ifdef __CET__
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#define ENDBR "endbr64\n\t"
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#else
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#define ENDBR
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
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#define HIDDEN __attribute__((visibility("hidden")))
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#else
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#define HIDDEN
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#endif
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__asm__(".text\n"
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".balign 32\n"
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"x86_64_entry_start:");
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#define STUB_ASM_ENTRY(func) \
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".globl " func "\n" \
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".type " func ", @function\n" \
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".balign 32\n" \
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func ":"
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#ifndef __ILP32__
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#define STUB_ASM_CODE(slot) \
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ENDBR \
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"movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \
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"movq %fs:(%rax), %r11\n\t" \
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"jmp *(8 * " slot ")(%r11)"
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#else
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#define STUB_ASM_CODE(slot) \
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ENDBR \
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"movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \
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"movl %fs:(%rax), %r11d\n\t" \
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"movl 4*" slot "(%r11d), %r11d\n\t" \
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"jmp *%r11"
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#endif
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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#ifndef MAPI_MODE_BRIDGE
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#include <string.h>
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#include "u_execmem.h"
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void
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entry_patch_public(void)
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{
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}
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extern char
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x86_64_entry_start[] HIDDEN;
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mapi_func
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entry_get_public(int slot)
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{
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return (mapi_func) (x86_64_entry_start + slot * 32);
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}
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void
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entry_patch(mapi_func entry, int slot)
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{
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char *code = (char *) entry;
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int offset = 12;
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#ifdef __ILP32__
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offset = 13;
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#endif
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*((unsigned int *) (code + offset)) = slot * sizeof(mapi_func);
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}
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mapi_func
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entry_generate(int slot)
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{
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const char code_templ[] = {
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#ifndef __ILP32__
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/* movq %fs:0, %r11 */
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0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
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/* jmp *0x1234(%r11) */
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0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
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#else
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/* movl %fs:0, %r11d */
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0x64, 0x44, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
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/* movl 0x1234(%r11d), %r11d */
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0x67, 0x45, 0x8b, 0x9b, 0x34, 0x12, 0x00, 0x00,
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/* jmp *%r11 */
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0x41, 0xff, 0xe3,
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#endif
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};
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unsigned long long addr;
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char *code;
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mapi_func entry;
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__asm__("movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%%rip), %0"
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: "=r" (addr));
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if ((addr >> 32) != 0xffffffff)
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return NULL;
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addr &= 0xffffffff;
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code = u_execmem_alloc(sizeof(code_templ));
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if (!code)
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return NULL;
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memcpy(code, code_templ, sizeof(code_templ));
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*((unsigned int *) (code + 5)) = addr;
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entry = (mapi_func) code;
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entry_patch(entry, slot);
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return entry;
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}
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#endif /* MAPI_MODE_BRIDGE */
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