157 lines
4.1 KiB
C
157 lines
4.1 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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#include <string.h>
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#ifdef __CET__
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#define ENDBR "endbr32\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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#define X86_ENTRY_SIZE 32
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__asm__(".text");
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__asm__("x86_current_tls:\n\t"
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"call 1f\n"
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"1:\n\t"
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"popl %eax\n\t"
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"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t"
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"movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t"
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"ret");
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#ifndef GLX_X86_READONLY_TEXT
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__asm__(".section wtext, \"awx\", @progbits");
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#endif /* GLX_X86_READONLY_TEXT */
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__asm__(".balign 16\n"
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"x86_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 16\n" \
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func ":"
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#define STUB_ASM_CODE(slot) \
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ENDBR \
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"call 1f\n" \
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"1:\n\t" \
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"popl %eax\n\t" \
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"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" \
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"movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t" \
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"movl %gs:(%eax), %eax\n\t" \
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"jmp *(4 * " slot ")(%eax)"
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#define MAPI_TMP_STUB_ASM_GCC
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#include "mapi_tmp.h"
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#ifndef GLX_X86_READONLY_TEXT
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__asm__(".balign 16\n"
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"x86_entry_end:");
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__asm__(".text");
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#endif /* GLX_X86_READONLY_TEXT */
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#ifndef MAPI_MODE_BRIDGE
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#include "u_execmem.h"
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extern unsigned long
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x86_current_tls();
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extern char x86_entry_start[] HIDDEN;
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extern char x86_entry_end[] HIDDEN;
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static inline mapi_func
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entry_generate_or_patch(int, char *, size_t);
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void
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entry_patch_public(void)
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{
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#ifndef GLX_X86_READONLY_TEXT
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char *entry;
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int slot = 0;
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for (entry = x86_entry_start; entry < x86_entry_end;
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entry += X86_ENTRY_SIZE, ++slot)
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entry_generate_or_patch(slot, entry, X86_ENTRY_SIZE);
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#endif
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}
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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_entry_start + slot * X86_ENTRY_SIZE);
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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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*((unsigned long *) (code + 8)) = slot * sizeof(mapi_func);
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}
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static inline mapi_func
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entry_generate_or_patch(int slot, char *code, size_t size)
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{
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const char code_templ[16] = {
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0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
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0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */
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0x90, 0x90, 0x90, 0x90 /* nop's */
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};
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mapi_func entry;
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if (code == NULL) {
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size = sizeof(code_templ);
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code = u_execmem_alloc(size);
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}
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if (!code || size < sizeof(code_templ))
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return NULL;
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memcpy(code, code_templ, sizeof(code_templ));
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*((unsigned long *) (code + 2)) = x86_current_tls();
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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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mapi_func
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entry_generate(int slot)
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{
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return entry_generate_or_patch(slot, NULL, 0);
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}
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#endif /* MAPI_MODE_BRIDGE */
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