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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>
*/
#ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
#define HIDDEN __attribute__((visibility("hidden")))
#else
#define HIDDEN
#endif
#define X86_ENTRY_SIZE 64
__asm__(".text\n"
".balign " U_STRINGIFY(X86_ENTRY_SIZE) "\n"
"x86_entry_start:");
#define STUB_ASM_ENTRY(func) \
".globl " func "\n" \
".type " func ", @function\n" \
".balign " U_STRINGIFY(X86_ENTRY_SIZE) "\n" \
func ":"
#define STUB_ASM_CODE(slot) \
"push %ebx\n\t" \
"call 1f\n" \
"1:\n\t" \
"popl %ebx\n\t" \
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx\n\t" \
"movl " ENTRY_CURRENT_TABLE "@GOT(%ebx), %eax\n\t" \
"mov (%eax), %eax\n\t" \
"testl %eax, %eax\n\t" \
"jne 1f\n\t" \
"call " ENTRY_CURRENT_TABLE_GET "@PLT\n" \
"1:\n\t" \
"pop %ebx\n\t" \
"jmp *(4 * " slot ")(%eax)"
#define MAPI_TMP_STUB_ASM_GCC
#include "mapi_tmp.h"
#ifndef MAPI_MODE_BRIDGE
__asm__(".balign " U_STRINGIFY(X86_ENTRY_SIZE) "\n"
"x86_entry_end:");
#include <string.h>
#include "u_execmem.h"
extern const char x86_entry_start[] HIDDEN;
extern const char x86_entry_end[] HIDDEN;
void
entry_patch_public(void)
{
}
mapi_func
entry_get_public(int slot)
{
return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
}
void
entry_patch(mapi_func entry, int slot)
{
char *code = (char *) entry;
*((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
*((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
}
mapi_func
entry_generate(int slot)
{
const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
void *code;
mapi_func entry;
code = u_execmem_alloc(X86_ENTRY_SIZE);
if (!code)
return NULL;
memcpy(code, code_templ, X86_ENTRY_SIZE);
entry = (mapi_func) code;
entry_patch(entry, slot);
return entry;
}
#endif /* MAPI_MODE_BRIDGE */
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