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Commit 193f087d authored by Greg Ungerer's avatar Greg Ungerer Committed by Greg Ungerer
Browse files

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: default avatarGreg Ungerer <gerg@uclinux.org>
parent 588baeac

arch/m68k/include/asm/ptrace.h

+12 −0
Original line number Diff line number Diff line
@@ -82,6 +82,18 @@ struct switch_stack { 
#define instruction_pointer(regs) ((regs)->pc)

#define profile_pc(regs) instruction_pointer(regs)

extern void show_regs(struct pt_regs *);



/*

 * These are defined as per linux/ptrace.h.

 */

struct task_struct;



#ifndef CONFIG_MMU

#define	arch_has_single_step()	(1)

extern void user_enable_single_step(struct task_struct *);

extern void user_disable_single_step(struct task_struct *);

#endif



#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#endif /* _M68K_PTRACE_H */

arch/m68knommu/kernel/ptrace.c

+15 −3
Original line number Diff line number Diff line
@@ -86,6 +86,20 @@ static inline int put_reg(struct task_struct *task, int regno, 
	return 0;

}



void user_enable_single_step(struct task_struct *task)

{

	unsigned long srflags;

	srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);

	put_reg(task, PT_SR, srflags);

}



void user_disable_single_step(struct task_struct *task)

{

	unsigned long srflags;

	srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);

	put_reg(task, PT_SR, srflags);

}



/*

 * Called by kernel/ptrace.c when detaching..

 *
@@ -93,10 +107,8 @@ static inline int put_reg(struct task_struct *task, int regno, 
 */

void ptrace_disable(struct task_struct *child)

{

	unsigned long tmp;

	/* make sure the single step bit is not set. */

	tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);

	put_reg(child, PT_SR, tmp);

	user_disable_single_step(child);

}



long arch_ptrace(struct task_struct *child, long request, long addr, long data)