Thanks, that was the hint I needed. o32_ret_from_sys_call expects the
content of s-registers to be unchanged from userspace but sys_sysmips
clobbers them.
Below a patch from the famous ``Smoke This, It's Good For You (TM)''
series. Lemme know if it helps.
Ralf
--- arch/mips/kernel/sysmips.c 2001/02/09 21:05:46 1.17
+++ arch/mips/kernel/sysmips.c 2001/03/12 11:12:20
@@ -19,6 +19,7 @@
#include <asm/cachectl.h>
#include <asm/pgalloc.h>
+#include <asm/stackframe.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
@@ -47,8 +48,9 @@
return address;
}
-asmlinkage int
-sys_sysmips(int cmd, int arg1, int arg2, int arg3)
+save_static_function(sys_sysmips);
+static_unused int
+_sys_sysmips(int cmd, int arg1, int arg2, int arg3)
{
int *p;
char *name;
@@ -114,7 +116,7 @@
__asm__ __volatile__(
"move\t$29, %0\n\t"
- "j\to32_ret_from_sys_call"
+ "j\to32_ret_from_sys_call_restore_static"
: /* No outputs */
: "r" (&cmd));
/* Unreached */
--- arch/mips/kernel/scall_o32.S 2000/08/08 18:54:49 1.14
+++ arch/mips/kernel/scall_o32.S 2001/03/12 11:09:12
@@ -86,6 +86,10 @@
RESTORE_SOME
RESTORE_SP_AND_RET
+EXPORT(o32_ret_from_sys_call_restore_static)
+ RESTORE_STATIC
+ j o32_ret_from_sys_call
+
o32_handle_softirq:
jal do_softirq
b 9b
