m68knommu: define arch_has_single_step() and friends
Towards adding CONFIG_UTRACE support for non-mmu m68k add arch_has_single_step, and its support functions user_enable_single_step() and user_disable_single_step(). Signed-off-by: Greg Ungerer <gerg@uclinux.org>
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@ -82,6 +82,18 @@ struct switch_stack {
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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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extern void show_regs(struct pt_regs *);
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/*
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* These are defined as per linux/ptrace.h.
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*/
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struct task_struct;
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#ifndef CONFIG_MMU
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#define arch_has_single_step() (1)
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extern void user_enable_single_step(struct task_struct *);
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extern void user_disable_single_step(struct task_struct *);
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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#endif /* _M68K_PTRACE_H */
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@ -86,6 +86,20 @@ static inline int put_reg(struct task_struct *task, int regno,
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return 0;
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}
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void user_enable_single_step(struct task_struct *task)
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{
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unsigned long srflags;
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srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);
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put_reg(task, PT_SR, srflags);
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}
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void user_disable_single_step(struct task_struct *task)
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{
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unsigned long srflags;
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srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);
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put_reg(task, PT_SR, srflags);
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}
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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@ -93,10 +107,8 @@ static inline int put_reg(struct task_struct *task, int regno,
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*/
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void ptrace_disable(struct task_struct *child)
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{
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unsigned long tmp;
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/* make sure the single step bit is not set. */
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tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
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put_reg(child, PT_SR, tmp);
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user_disable_single_step(child);
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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