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m68knommu: define arch_has_single_step() and friends

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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>
This commit is contained in:
Greg Ungerer 2009-07-07 15:54:54 +10:00 committed by Greg Ungerer
parent 588baeac38
commit 193f087d49
2 changed files with 27 additions and 3 deletions
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12
arch/m68k/include/asm/ptrace.h
View file

@ -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 */

18
arch/m68knommu/kernel/ptrace.c
View file

@ -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)