On Wed, 2009-04-01 at 14:59 -0700, Roland McGrath wrote:
> diff --git a/arch/powerpc/include/asm/ptrace.h
> b/arch/powerpc/include/asm/ptrace.h
> index c9c678f..d7692b8 100644
> --- a/arch/powerpc/include/asm/ptrace.h
> +++ b/arch/powerpc/include/asm/ptrace.h
> @@ -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() (1)
The patch only implements it for "server/classic" processors, not BookE,
thus it should probably only advertise it for these :-)
Though it wouldn't be too hard to implement it for BookE using DBCR0:BRT
(Branch Taken debug event) though it might need some careful fixups such
as the one we have for single step regarding hitting exception entry
code.
Cheers,
Ben.
> 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 */
> diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
> index 3635be6..656fea2 100644
> --- a/arch/powerpc/kernel/ptrace.c
> +++ b/arch/powerpc/kernel/ptrace.c
> @@ -707,12 +707,29 @@ void user_enable_single_step(struct task_struct *task)
> task->thread.dbcr0 |= DBCR0_IDM | DBCR0_IC;
> regs->msr |= MSR_DE;
> #else
> + regs->msr &= ~MSR_BE;
> regs->msr |= MSR_SE;
> #endif
> }
> set_tsk_thread_flag(task, TIF_SINGLESTEP);
> }
>
> +void user_enable_block_step(struct task_struct *task)
> +{
> + struct pt_regs *regs = task->thread.regs;
> +
> + if (regs != NULL) {
> +#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
> + task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
> + regs->msr |= MSR_DE;
> +#else
> + regs->msr &= ~MSR_SE;
> + regs->msr |= MSR_BE;
> +#endif
> + }
> + set_tsk_thread_flag(task, TIF_SINGLESTEP);
> +}
> +
> void user_disable_single_step(struct task_struct *task)
> {
> struct pt_regs *regs = task->thread.regs;
> @@ -729,7 +746,7 @@ void user_disable_single_step(struct task_struct *task)
> task->thread.dbcr0 &= ~(DBCR0_IC | DBCR0_IDM);
> regs->msr &= ~MSR_DE;
> #else
> - regs->msr &= ~MSR_SE;
> + regs->msr &= ~(MSR_SE | MSR_BE);
> #endif
> }
> clear_tsk_thread_flag(task, TIF_SINGLESTEP);
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
