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csky: Use in_syscall & forget_syscall instead of r11_sig

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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>
This commit is contained in:
Guo Ren
2019-03-30 23:44:34 +08:00
parent f335b10f3b
commit f4625ee0e4
5 changed files with 22 additions and 20 deletions
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12
arch/csky/include/asm/ptrace.h
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@@ -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;