Mesa (master): mapi: Add x86-64 dispatcher.

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: de3994076ea673d71059c13dab78a327dd20896c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=de3994076ea673d71059c13dab78a327dd20896c

Author: Chia-I Wu <olv at lunarg.com>
Date:   Thu Apr 22 16:22:13 2010 +0800

mapi: Add x86-64 dispatcher.

---

 src/mapi/mapi/entry.c            |    2 +
 src/mapi/mapi/entry_x86-64_tls.h |   97 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+), 0 deletions(-)

diff --git a/src/mapi/mapi/entry.c b/src/mapi/mapi/entry.c
index 968aa44..fdf2a89 100644
--- a/src/mapi/mapi/entry.c
+++ b/src/mapi/mapi/entry.c
@@ -34,6 +34,8 @@
 #   else                 
 #      include "entry_x86_tsd.h"
 #   endif
+#elif defined(USE_X86_64_ASM) && defined(__GNUC__) && defined(GLX_USE_TLS)
+#   include "entry_x86-64_tls.h"
 #else
 
 #include <stdlib.h>
diff --git a/src/mapi/mapi/entry_x86-64_tls.h b/src/mapi/mapi/entry_x86-64_tls.h
new file mode 100644
index 0000000..d4c9907
--- /dev/null
+++ b/src/mapi/mapi/entry_x86-64_tls.h
@@ -0,0 +1,97 @@
+/*
+ * 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 at lunarg.com>
+ */
+
+#include <string.h>
+#include "u_execmem.h"
+#include "u_macros.h"
+
+__asm__(".text");
+
+__asm__("x86_64_current_tls:\n\t"
+	"movq _glapi_tls_Dispatch at GOTTPOFF(%rip), %rax\n\t"
+	"ret");
+
+#define STUB_ASM_ENTRY(func)                             \
+   ".globl " func "\n"                                   \
+   ".type " func ", @function\n"                         \
+   ".balign 32\n"                                        \
+   func ":"
+
+#define STUB_ASM_CODE(slot)                              \
+   "movq _glapi_tls_Dispatch at 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"
+
+extern unsigned long
+x86_64_current_tls();
+
+void
+entry_patch_public(void)
+{
+}
+
+void
+entry_patch(mapi_func entry, int slot)
+{
+   void *code = (void *) entry;
+   *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
+}
+
+mapi_func
+entry_generate(int slot)
+{
+   const char code_templ[16] = {
+      /* movq %fs:0, %r11 */
+      0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
+      /* jmp *0x1234(%r11) */
+      0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
+   };
+   unsigned long addr;
+   void *code;
+   mapi_func entry;
+
+   addr = x86_64_current_tls();
+   if ((addr >> 32) != 0xffffffff)
+      return NULL;
+   addr &= 0xffffffff;
+
+   code = u_execmem_alloc(sizeof(code_templ));
+   if (!code)
+      return NULL;
+
+   memcpy(code, code_templ, sizeof(code_templ));
+
+   *((unsigned int *) (code + 5)) = addr;
+   entry = (mapi_func) code;
+   entry_patch(entry, slot);
+
+   return entry;
+}