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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().
[Geert] m68k conflict resolution from linux-next

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Greg Ungerer 2009-07-07 15:54:54 +10:00 committed by Geert Uytterhoeven
parent f195e2bff3
commit f60a557267
2 changed files with 16 additions and 4 deletions
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2
arch/m68k/include/asm/ptrace.h
View File

@ -90,11 +90,11 @@ extern void show_regs(struct pt_regs *);
*/
struct task_struct;
#ifdef 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 *);
#ifdef CONFIG_MMU
#define arch_has_block_step() (1)
extern void user_enable_block_step(struct task_struct *);
#endif

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)