1 files changed, 58 insertions, 0 deletions

diff --git a/meta/recipes-graphics/mesa/qemugl/call_opengl_fix.patch b/meta/recipes-graphics/mesa/qemugl/call_opengl_fix.patch
new file mode 100644
index 0000000000..c5e3592a74
--- /dev/null
+++ b/meta/recipes-graphics/mesa/qemugl/call_opengl_fix.patch
@@ -0,0 +1,58 @@
+Save registers via local variables instead of simple "push", so that gcc become
+aware of this operation and avoid stack disorder.
+
+opengl calling (in call_opengl_qemu) includes 4 steps:
+1. prepare opengl parameters on stack
+2. save some "input" register by push
+3. load "input" register with parameters on stack via same index as step 1
+4. issue "int 0x99" to trap into qemu, who will get parameter in the registers
+
+New gcc uses "%esp" rather than "%ebp" to index local variable in stack, which
+leads wrong index in step 3, as push decrease "%esp" automatically. Saving
+registers via local variables to fix it.
+
+Upstream-Status: Pending
+
+Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>
+Index: git/opengl_client.c
+===================================================================
+--- git.orig/opengl_client.c    2011-09-19 19:44:51.000000000 +0800
++++ git/opengl_client.c 2011-09-22 10:11:04.000000000 +0800
+@@ -1076,23 +1076,29 @@
+ {
+ #if defined(__i386__)
+   int ret;
++  int bx, cx, dx, si;
+ #ifdef WIN32
+   __asm__ ("pushl %0;pushl %%fs:0;movl %%esp,%%fs:0;" : : "g" (win32_sigsegv_handler));
+ #endif
+-  __asm__ ("push %ebx");
+-  __asm__ ("push %ecx");
+-  __asm__ ("push %edx");
+-  __asm__ ("push %esi");
++  /* save registers before opengl call */
++  __asm__ ("mov %%ebx, %0"::"m"(bx));
++  __asm__ ("mov %%ecx, %0"::"m"(cx));
++  __asm__ ("mov %%edx, %0"::"m"(dx));
++  __asm__ ("mov %%esi, %0"::"m"(si));
++
+   __asm__ ("mov %0, %%eax"::"m"(func_number));
+   __asm__ ("mov %0, %%ebx"::"m"(pid));
+   __asm__ ("mov %0, %%ecx"::"m"(ret_string));
+   __asm__ ("mov %0, %%edx"::"m"(args));
+   __asm__ ("mov %0, %%esi"::"m"(args_size));
+   __asm__ ("int $0x99");
+-  __asm__ ("pop %esi");
+-  __asm__ ("pop %edx");
+-  __asm__ ("pop %ecx");
+-  __asm__ ("pop %ebx");
++
++  /* restore registers */
++  __asm__ ("mov %0, %%ebx"::"m"(bx));
++  __asm__ ("mov %0, %%ecx"::"m"(cx));
++  __asm__ ("mov %0, %%edx"::"m"(dx));
++  __asm__ ("mov %0, %%esi"::"m"(si));
++
+   __asm__ ("mov %%eax, %0"::"m"(ret));
+ #ifdef WIN32
+   __asm__ ("movl (%%esp),%%ecx;movl %%ecx,%%fs:0;addl $8,%%esp;" : : : "%ecx");