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csky: Fixup abiv2 syscall_trace break a4 & a5

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[ Upstream commit e0bbb53843b5fdfe464b099217e3b9d97e8a75d7 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guo Ren 2020-05-24 10:44:38 +00:00 committed by Greg Kroah-Hartman
parent 16d902821b
commit 108681048c
2 changed files with 6 additions and 2 deletions
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2
arch/csky/abiv2/inc/abi/entry.h
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@ -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

6
arch/csky/kernel/entry.S
View File

@ -170,8 +170,10 @@ 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)