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/*
* 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 "entry.h"
#include "entry_common.h"
#include <assert.h>
#include <sys/mman.h>
#include <unistd.h>
#include <string.h>
#include "utils_misc.h"
#include "u_macros.h"
#include "glapi/glapi.h"
#include "glvnd/GLdispatchABI.h"
#define ENTRY_STUB_ALIGN 32
#define ENTRY_STUB_SIZE ENTRY_STUB_ALIGN
#define ENTRY_STUB_ALIGN_DIRECTIVE ".balign " U_STRINGIFY(ENTRY_STUB_ALIGN) "\n"
__asm__(".section wtext,\"ax\",@progbits\n");
__asm__(".balign 4096\n"
".globl public_entry_start\n"
"public_entry_start:");
#define STUB_ASM_ENTRY(func) \
".globl " func "\n" \
".type " func ", @function\n" \
ENTRY_STUB_ALIGN_DIRECTIVE \
func ":"
#define STUB_ASM_CODE(slot) \
"movq _glapi_tls_Current@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"
__asm__(".balign 4096\n"
".globl public_entry_end\n"
"public_entry_end:");
__asm__(".text\n");
__asm__("x86_64_current_tls:\n\t"
ENTRY_STUB_ALIGN_DIRECTIVE
"movq _glapi_tls_Current@GOTTPOFF(%rip), %rax\n\t"
"ret");
extern unsigned long
x86_64_current_tls();
const int entry_type = __GLDISPATCH_STUB_X86_64;
const int entry_stub_size = ENTRY_STUB_SIZE;
void entry_generate_default_code(char *entry, int slot)
{
char *writeEntry = u_execmem_get_writable(entry);
unsigned int *p;
unsigned long tls_addr;
char tmpl[] = {
0x48, 0xc7, 0xc0, 0x0, 0x0, 0x0, 0x0, // mov 0x0,%rax
0x64, 0x4c, 0x8b, 0x18, // mov %fs:(%rax),%r11
0x41, 0xff, 0xa3, // jmpq *0x0(%r11)
0x00, 0x00, 0x00, 0x00,
0x90 // nop
};
STATIC_ASSERT(sizeof(mapi_func) == 8);
STATIC_ASSERT(ENTRY_STUB_SIZE >= sizeof(tmpl));
assert(slot >= 0);
tls_addr = x86_64_current_tls();
p = (unsigned int *)&tmpl[3];
*p = (unsigned int)tls_addr;
p = (unsigned int *)&tmpl[14];
*p = (unsigned int)(8 * slot);
memcpy(writeEntry, tmpl, sizeof(tmpl));
}
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