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Subject[PATCH 2/3] csky: Fixup abiv2 syscall_trace break a4 & a5
Date
From: Guo Ren <guoren@linux.alibaba.com>

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>
---
arch/csky/abiv2/inc/abi/entry.h | 2 ++
arch/csky/kernel/entry.S | 6 ++++--
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h
index 698df2f..6ee71bf 100644
--- 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
--- 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)
--
2.7.4
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