csky: Fixup abiv2 syscall_trace break a4 & a5

Current implementation could destory a4 & a5 when strace, so we need to get them
from pt_regs by SAVE_ALL.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h
index 698df2f..6ee71bf 100644 (file)
--- a/arch/csky/abiv2/inc/abi/entry.h
+++ b/arch/csky/abiv2/inc/abi/entry.h
@@ -13,6 +13,8 @@
 #define LSAVE_A1       28
 #define LSAVE_A2       32
 #define LSAVE_A3       36
+#define LSAVE_A4       40
+#define LSAVE_A5       44
 
 #define KSPTOUSP
 #define USPTOKSP

diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index bfbef30..76dc729 100644 (file)
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@@ -173,8 +173,10 @@ csky_syscall_trace:
        ldw     a3, (sp, LSAVE_A3)
 #if defined(__CSKYABIV2__)
        subi    sp, 8
-       stw     r5, (sp, 0x4)
-       stw     r4, (sp, 0x0)
+       ldw     r9, (sp, LSAVE_A4)
+       stw     r9, (sp, 0x0)
+       ldw     r9, (sp, LSAVE_A5)
+       stw     r9, (sp, 0x4)
 #else
        ldw     r6, (sp, LSAVE_A4)
        ldw     r7, (sp, LSAVE_A5)