--- /dev/null
+/*
+ * 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 */
projects / mesa.git / blobdiff