[MIPS] Fix register handling in syscalls when debugging.

    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 12 insertions, 4 deletions

diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index 2258fc69e14d..a42e0e8caa7b 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -94,11 +94,13 @@ syscall_trace_entry:
         li      a1, 0
         jal     do_syscall_trace
 
+        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    s0
+        jalr    t0
 
         li      t0, -EMAXERRNO - 1      # error?
         sltu    t0, t0, v0
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index cb28de6a2efa..47bfbd416709 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -93,13 +93,15 @@ syscall_trace_entry:
         li      a1, 0
         jal     do_syscall_trace
 
+        move    t0, s0
+        RESTORE_STATIC
         ld      a0, PT_R4(sp)           # Restore argument registers
         ld      a1, PT_R5(sp)
         ld      a2, PT_R6(sp)
         ld      a3, PT_R7(sp)
         ld      a4, PT_R8(sp)
         ld      a5, PT_R9(sp)
-        jalr    s0
+        jalr    t0
 
         li      t0, -EMAXERRNO - 1      # error?
         sltu    t0, t0, v0
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 7e66eb823bf6..b465ced1758f 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -90,13 +90,15 @@ n32_syscall_trace_entry:
         li      a1, 0
         jal     do_syscall_trace
 
+        move    t0, s0
+        RESTORE_STATIC
         ld      a0, PT_R4(sp)           # Restore argument registers
         ld      a1, PT_R5(sp)
         ld      a2, PT_R6(sp)
         ld      a3, PT_R7(sp)
         ld      a4, PT_R8(sp)
         ld      a5, PT_R9(sp)
-        jalr    s0
+        jalr    t0
 
         li      t0, -EMAXERRNO - 1      # error?
         sltu    t0, t0, v0
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 5a16401e443a..3d338ca7eeeb 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -124,6 +124,8 @@ trace_a_syscall:
         li      a1, 0
         jal     do_syscall_trace
 
+        move    t0, s0
+        RESTORE_STATIC
         ld      a0, PT_R4(sp)           # Restore argument registers
         ld      a1, PT_R5(sp)
         ld      a2, PT_R6(sp)
@@ -132,7 +134,7 @@ trace_a_syscall:
         ld      a5, PT_R9(sp)
         ld      a6, PT_R10(sp)
         ld      a7, PT_R11(sp)          # For indirect syscalls
-        jalr    s0
+        jalr    t0
 
         li      t0, -EMAXERRNO - 1      # error?
         sltu    t0, t0, v0