libwine: Fix wine_switch_to_stack on ppc.

The PowerPC ABI expects the caller to allocate space for the return address on the stack, above the current stack pointer, even if the address is passed in the link register (usually the address is stored at SP+4 by the callee).

libwine: Fix wine_switch_to_stack on ppc.
2416533c · Simon Richter · Alexandre Julliard · ff77ba8e · 2416533c
Commit 2416533c authored May 31, 2008 by Simon Richter Committed by Alexandre Julliard Jun 02, 2008
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port.c libs/wine/port.c +5 -2

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--- a/libs/wine/port.c
+++ b/libs/wine/port.c
@@ -90,14 +90,17 @@ __ASM_GLOBAL_FUNC( wine_switch_to_stack,
                   "mr r3,r4\n\t" /* args -> function param 1 (r3) */
                   "mr r1,r5\n\t" /* stack */
                   "subi r1,r1,0x100\n\t" /* adjust stack pointer */
-                   "bctr\n" /* call ctr */
+                   "bctrl\n" /* call ctr */
                   "1:\tb 1b") /* loop */
 #elif defined(__powerpc__) && defined(__GNUC__)
 __ASM_GLOBAL_FUNC( wine_switch_to_stack,
                   "mtctr 3\n\t" /* func -> ctr */
                   "mr 3,4\n\t" /* args -> function param 1 (r3) */
                   "mr 1,5\n\t" /* stack */
-                   "bctr\n\t" /* call ctr */
+                   "subi 1, 1, 16\n\t" /* allocate space for the callee */
+                   "li 0, 0\n\t" /* load zero */
+                   "stw 0, 0(1)\n\t" /* create a bottom stack frame */
+                   "bctrl\n\t" /* call ctr */
                   "1:\tb 1b") /* loop */
 #elif defined(__ALPHA__) && defined(__GNUC__)
 __ASM_GLOBAL_FUNC( wine_switch_to_stack,