MIPS: scall: Always run the seccomp syscall filters

[linux-drm-fsl-dcu.git] / arch / mips / kernel / scall32-o32.S

diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index d06e30c1e4cda2e05e4f3541e6a8e31d825ce58f..65a74e4f0f456d1de9d29ed83a62e1bcc6e644fc 100644 (file)
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -36,16 +36,8 @@ NESTED(handle_sys, PT_SIZE, sp)
        lw      t1, PT_EPC(sp)          # skip syscall on return
 
        subu    v0, v0, __NR_O32_Linux  # check syscall number
-       sltiu   t0, v0, __NR_O32_Linux_syscalls + 1
        addiu   t1, 4                   # skip to next instruction
        sw      t1, PT_EPC(sp)
-       beqz    t0, illegal_syscall
-
-       sll     t0, v0, 2
-       la      t1, sys_call_table
-       addu    t1, t0
-       lw      t2, (t1)                # syscall routine
-       beqz    t2, illegal_syscall
 
        sw      a3, PT_R26(sp)          # save a3 for syscall restarting
 
@@ -96,6 +88,16 @@ loads_done:
        li      t1, _TIF_WORK_SYSCALL_ENTRY
        and     t0, t1
        bnez    t0, syscall_trace_entry # -> yes
+syscall_common:
+       sltiu   t0, v0, __NR_O32_Linux_syscalls + 1
+       beqz    t0, illegal_syscall
+
+       sll     t0, v0, 2
+       la      t1, sys_call_table
+       addu    t1, t0
+       lw      t2, (t1)                # syscall routine
+
+       beqz    t2, illegal_syscall
 
        jalr    t2                      # Do The Real Thing (TM)
 
@@ -116,7 +118,7 @@ o32_syscall_exit:
 
 syscall_trace_entry:
        SAVE_STATIC
-       move    s0, t2
+       move    s0, v0
        move    a0, sp
 
        /*
@@ -129,27 +131,18 @@ syscall_trace_entry:
 
 1:     jal     syscall_trace_enter
 
-       bltz    v0, 2f                  # seccomp failed? Skip syscall
+       bltz    v0, 1f                  # seccomp failed? Skip syscall
+
+       move    v0, s0                  # restore syscall
 
-       move    t0, s0
        RESTORE_STATIC
        lw      a0, PT_R4(sp)           # Restore argument registers
        lw      a1, PT_R5(sp)
        lw      a2, PT_R6(sp)
        lw      a3, PT_R7(sp)
-       jalr    t0
-
-       li      t0, -EMAXERRNO - 1      # error?
-       sltu    t0, t0, v0
-       sw      t0, PT_R7(sp)           # set error flag
-       beqz    t0, 1f
-
-       lw      t1, PT_R2(sp)           # syscall number
-       negu    v0                      # error
-       sw      t1, PT_R0(sp)           # save it for syscall restarting
-1:     sw      v0, PT_R2(sp)           # result
+       j       syscall_common
 
-2:     j       syscall_exit
+1:     j       syscall_exit
 
 /* ------------------------------------------------------------------------ */