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-rw-r--r--arch/mips/kernel/scall32-o32.S11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index d01fe53a6638..c8e43e0c4066 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -35,7 +35,6 @@ NESTED(handle_sys, PT_SIZE, sp)
lw t1, PT_EPC(sp) # skip syscall on return
- subu v0, v0, __NR_O32_Linux # check syscall number
addiu t1, 4 # skip to next instruction
sw t1, PT_EPC(sp)
@@ -89,6 +88,7 @@ loads_done:
and t0, t1
bnez t0, syscall_trace_entry # -> yes
syscall_common:
+ subu v0, v0, __NR_O32_Linux # check syscall number
sltiu t0, v0, __NR_O32_Linux_syscalls + 1
beqz t0, illegal_syscall
@@ -118,24 +118,23 @@ o32_syscall_exit:
syscall_trace_entry:
SAVE_STATIC
- move s0, v0
move a0, sp
/*
* syscall number is in v0 unless we called syscall(__NR_###)
* where the real syscall number is in a0
*/
- addiu a1, v0, __NR_O32_Linux
- bnez v0, 1f /* __NR_syscall at offset 0 */
+ move a1, v0
+ subu t2, v0, __NR_O32_Linux
+ bnez t2, 1f /* __NR_syscall at offset 0 */
lw a1, PT_R4(sp)
1: jal syscall_trace_enter
bltz v0, 1f # seccomp failed? Skip syscall
- move v0, s0 # restore syscall
-
RESTORE_STATIC
+ lw v0, PT_R2(sp) # Restore syscall (maybe modified)
lw a0, PT_R4(sp) # Restore argument registers
lw a1, PT_R5(sp)
lw a2, PT_R6(sp)