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powerpc: Add PTRACE_SINGLEBLOCK support

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Reworked by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

This adds block-step support on powerpc, including a PTRACE_SINGLEBLOCK
request for ptrace.

The BookE implementation is tweaked to fire a single step after a
block step in order to mimmic the server behaviour.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Roland McGrath
2009-05-28 21:26:38 +00:00
committed by Benjamin Herrenschmidt
parent dac4ccfb64
commit ec097c84df
4 changed files with 60 additions and 11 deletions
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4
arch/powerpc/include/asm/ptrace.h
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@@ -135,7 +135,9 @@ do { \
* These are defined as per linux/ptrace.h, which see.
*/
#define arch_has_single_step() (1)
#define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601))
extern void user_enable_single_step(struct task_struct *);
extern void user_enable_block_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);
#endif /* __ASSEMBLY__ */
@@ -288,4 +290,6 @@ extern void user_disable_single_step(struct task_struct *);
#define PPC_PTRACE_PEEKUSR_3264 0x91
#define PPC_PTRACE_POKEUSR_3264 0x90
#define PTRACE_SINGLEBLOCK 0x100 /* resume execution until next branch */
#endif /* _ASM_POWERPC_PTRACE_H */