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authorGuo Ren <ren_guo@c-sky.com>2019-03-30 23:44:34 +0800
committerGuo Ren <ren_guo@c-sky.com>2019-04-22 13:44:57 +0800
commitf4625ee0e40a5c724bb3f3eb7fd89e491bfd7646 (patch)
tree5e94b471f288c647793f4ad38697d28f81573022 /arch/csky/include/asm/ptrace.h
parentf335b10f3b6ca2d11adef95092fff65152c31b48 (diff)
downloadlinux-sh-f4625ee0e40a5c724bb3f3eb7fd89e491bfd7646.tar.gz
csky: Use in_syscall & forget_syscall instead of r11_sig
We could use regs->sr 16-24 bits to detect syscall: VEC_TRAP0 and r11_sig is no necessary for current implementation. In this patch, we implement the in_syscall and forget_syscall which are inspired from arm & nds32, but csky pt_regs has no syscall_num element and we just set zero to regs->sr's vector-bits-field instead. For ret_from_fork, current task was forked from parent which is in syscall progress and its regs->sr has been already setted with VEC_TRAP0. See: arch/csky/kernel/process.c: copy_thread() Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Diffstat (limited to 'arch/csky/include/asm/ptrace.h')
-rw-r--r--arch/csky/include/asm/ptrace.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/csky/include/asm/ptrace.h b/arch/csky/include/asm/ptrace.h
index 1e00578166f0..d0aba7b32417 100644
--- a/arch/csky/include/asm/ptrace.h
+++ b/arch/csky/include/asm/ptrace.h
@@ -5,6 +5,8 @@
#define __ASM_CSKY_PTRACE_H
#include <uapi/asm/ptrace.h>
+#include <asm/traps.h>
+#include <linux/types.h>
#ifndef __ASSEMBLY__
@@ -20,6 +22,16 @@
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
+static inline bool in_syscall(struct pt_regs const *regs)
+{
+ return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
+}
+
+static inline void forget_syscall(struct pt_regs *regs)
+{
+ regs->sr &= ~(0xff << 16);
+}
+
static inline unsigned long regs_return_value(struct pt_regs *regs)
{
return regs->a0;