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-rw-r--r--arch/sh/kernel/entry-common.S15
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index ca46834294b7..13047a4facd2 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -193,10 +193,10 @@ syscall_trace_entry:
! Reload R0-R4 from kernel stack, where the
! parent may have modified them using
! ptrace(POKEUSR). (Note that R0-R2 are
- ! used by the system call handler directly
- ! from the kernel stack anyway, so don't need
- ! to be reloaded here.) This allows the parent
- ! to rewrite system calls and args on the fly.
+ ! reloaded from the kernel stack by syscall_call
+ ! below, so don't need to be reloaded here.)
+ ! This allows the parent to rewrite system calls
+ ! and args on the fly.
mov.l @(OFF_R4,r15), r4 ! arg0
mov.l @(OFF_R5,r15), r5
mov.l @(OFF_R6,r15), r6
@@ -357,8 +357,15 @@ syscall_call:
mov.l 3f, r8 ! Load the address of sys_call_table
add r8, r3
mov.l @r3, r8
+ mov.l @(OFF_R2,r15), r2
+ mov.l @(OFF_R1,r15), r1
+ mov.l @(OFF_R0,r15), r0
+ mov.l r2, @-r15
+ mov.l r1, @-r15
+ mov.l r0, @-r15
jsr @r8 ! jump to specific syscall handler
nop
+ add #12, r15
mov.l @(OFF_R0,r15), r12 ! save r0
mov.l r0, @(OFF_R0,r15) ! save the return value
!