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f4625ee0e4
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>
41 lines
986 B
C
41 lines
986 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_PTRACE_H
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#define __ASM_CSKY_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#include <asm/traps.h>
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#include <linux/types.h>
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#ifndef __ASSEMBLY__
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#define PS_S 0x80000000 /* Supervisor Mode */
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#define arch_has_single_step() (1)
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#define current_pt_regs() \
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({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; })
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#define user_stack_pointer(regs) ((regs)->usp)
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#define user_mode(regs) (!((regs)->sr & PS_S))
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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static inline bool in_syscall(struct pt_regs const *regs)
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{
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return ((regs->sr >> 16) & 0xff) == VEC_TRAP0;
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}
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static inline void forget_syscall(struct pt_regs *regs)
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{
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regs->sr &= ~(0xff << 16);
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}
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static inline unsigned long regs_return_value(struct pt_regs *regs)
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{
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return regs->a0;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_CSKY_PTRACE_H */
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