1 files changed, 120 insertions, 0 deletions
diff --git a/src/mapi/mapi/entry_x86_tls.h b/src/mapi/mapi/entry_x86_tls.h
new file mode 100644
index 0000000000..de0498181d
--- /dev/null
+++ b/src/mapi/mapi/entry_x86_tls.h
@@ -0,0 +1,120 @@
+/*
+ * 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_execmem.h"
+#include "u_macros.h"
+
+__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 _glapi_tls_Dispatch@GOTNTPOFF(%eax), %eax\n\t"
+	"ret");
+
+#ifndef GLX_X86_READONLY_TEXT
+__asm__(".section wtext, \"awx\", @progbits\n"
+        ".balign 16\n"
+        "x86_entry_start:");
+#endif /* GLX_X86_READONLY_TEXT */
+
+#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 */
+
+extern unsigned long
+x86_current_tls();
+
+void
+entry_patch_public(void)
+{
+#ifndef GLX_X86_READONLY_TEXT
+   extern char x86_entry_start[];
+   extern char x86_entry_end[];
+   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
+}
+
+void
+entry_patch(mapi_func entry, int slot)
+{
+   void *code = (void *) 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;
+}