Try this patch -- as a bonus it compiles to smaller code.
(I've been using a variant on this since before 2.2.0 and it's reliable).
Enjoy,
-- Jamie
--- linux-2.2.8/include/asm-i386/system.h.devel Wed May 12 00:44:17 1999
+++ linux-2.2.8/include/asm-i386/system.h Wed May 12 00:50:44 1999
@@ -9,24 +9,25 @@
struct task_struct; /* one of the stranger aspects of C forward declarations.. */
extern void FASTCALL(__switch_to(struct task_struct *prev, struct task_struct *next));
+/*
+ * EBP must be the last thing pushed for get_wchan() [see fs/proc/array.c].
+ * Anyway GCC ignores EBP in a clobber list.
+ */
#define switch_to(prev,next,last) do { \
- asm volatile("pushl %%esi\n\t" \
- "pushl %%edi\n\t" \
- "pushl %%ebp\n\t" \
+ asm volatile("pushl %%ebp\n\t" \
"movl %%esp,%0\n\t" /* save ESP */ \
"movl %3,%%esp\n\t" /* restore ESP */ \
"movl $1f,%1\n\t" /* save EIP */ \
"pushl %4\n\t" /* restore EIP */ \
"jmp __switch_to\n" \
"1:\t" \
- "popl %%ebp\n\t" \
- "popl %%edi\n\t" \
- "popl %%esi\n\t" \
+ "popl %%ebp" \
:"=m" (prev->tss.esp),"=m" (prev->tss.eip), \
"=b" (last) \
:"m" (next->tss.esp),"m" (next->tss.eip), \
"a" (prev), "d" (next), \
- "b" (prev)); \
+ "b" (prev) \
+ :"esi", "edi"); \
} while (0)
#define _set_base(addr,base) do { unsigned long __pr; \
-
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