by Mathieu Malaterre

[permalink] [raw]

Subject: Re: [RFC PATCH v1 11/13] powerpc/ptrace: create ppc_gethwdinfo()

On Tue, Jun 25, 2019 at 1:22 PM Christophe Leroy
<[email protected]> wrote:
>
> Create ippc_gethwdinfo() to handle PPC_PTRACE_GETHWDBGINFO and

s/ippc_gethwdinfo/ppc_gethwdinfo/

> reduce ifdef mess
>
> Signed-off-by: Christophe Leroy <[email protected]>
> ---
> arch/powerpc/kernel/ptrace/ptrace-adv.c | 15 +++++++++++++++
> arch/powerpc/kernel/ptrace/ptrace-decl.h | 1 +
> arch/powerpc/kernel/ptrace/ptrace-noadv.c | 20 +++++++++++++++++++
> arch/powerpc/kernel/ptrace/ptrace.c | 32 +------------------------------
> 4 files changed, 37 insertions(+), 31 deletions(-)
>
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-adv.c b/arch/powerpc/kernel/ptrace/ptrace-adv.c
> index dcc765940344..f5f334484ebc 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-adv.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace-adv.c
> @@ -83,6 +83,21 @@ void user_disable_single_step(struct task_struct *task)
> clear_tsk_thread_flag(task, TIF_SINGLESTEP);
> }
>
> +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo)

Would it be possible to rename it to `ppc_gethwdbginfo`, I find it
easier to read.

> +{
> + dbginfo->version = 1;
> + dbginfo->num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
> + dbginfo->num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
> + dbginfo->num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
> + dbginfo->data_bp_alignment = 4;
> + dbginfo->sizeof_condition = 4;
> + dbginfo->features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
> + PPC_DEBUG_FEATURE_INSN_BP_MASK;
> + if (IS_ENABLED(CONFIG_PPC_ADV_DEBUG_DAC_RANGE))
> + dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_RANGE |
> + PPC_DEBUG_FEATURE_DATA_BP_MASK;
> +}
> +
> int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
> unsigned long __user *datalp)
> {
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-decl.h b/arch/powerpc/kernel/ptrace/ptrace-decl.h
> index cd5b8256ba56..2404b987b23c 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-decl.h
> +++ b/arch/powerpc/kernel/ptrace/ptrace-decl.h
> @@ -141,6 +141,7 @@ int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset,
> extern const struct user_regset_view user_ppc_native_view;
>
> /* ptrace-(no)adv */
> +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo);
> int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
> unsigned long __user *datalp);
> int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data);
> diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> index 985cca136f85..426fedd7ab6c 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c
> @@ -64,6 +64,26 @@ void user_disable_single_step(struct task_struct *task)
> clear_tsk_thread_flag(task, TIF_SINGLESTEP);
> }
>
> +void ppc_gethwdinfo(struct ppc_debug_info *dbginfo)
> +{
> + dbginfo->version = 1;
> + dbginfo->num_instruction_bps = 0;
> + if (ppc_breakpoint_available())
> + dbginfo->num_data_bps = 1;
> + else
> + dbginfo->num_data_bps = 0;
> + dbginfo->num_condition_regs = 0;
> + dbginfo->data_bp_alignment = sizeof(long);
> + dbginfo->sizeof_condition = 0;
> + if (IS_ENABLED(CONFIG_HAVE_HW_BREAKPOINT)) {
> + dbginfo->features = PPC_DEBUG_FEATURE_DATA_BP_RANGE;
> + if (dawr_enabled())
> + dbginfo->features |= PPC_DEBUG_FEATURE_DATA_BP_DAWR;
> + } else {
> + dbginfo->features = 0;
> + }
> +}
> +
> int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
> unsigned long __user *datalp)
> {
> diff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c
> index e789afae6f56..31e8c5a9171e 100644
> --- a/arch/powerpc/kernel/ptrace/ptrace.c
> +++ b/arch/powerpc/kernel/ptrace/ptrace.c
> @@ -159,37 +159,7 @@ long arch_ptrace(struct task_struct *child, long request,
> case PPC_PTRACE_GETHWDBGINFO: {
> struct ppc_debug_info dbginfo;
>
> - dbginfo.version = 1;
> -#ifdef CONFIG_PPC_ADV_DEBUG_REGS
> - dbginfo.num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
> - dbginfo.num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
> - dbginfo.num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
> - dbginfo.data_bp_alignment = 4;
> - dbginfo.sizeof_condition = 4;
> - dbginfo.features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
> - PPC_DEBUG_FEATURE_INSN_BP_MASK;
> -#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
> - dbginfo.features |=
> - PPC_DEBUG_FEATURE_DATA_BP_RANGE |
> - PPC_DEBUG_FEATURE_DATA_BP_MASK;
> -#endif
> -#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
> - dbginfo.num_instruction_bps = 0;
> - if (ppc_breakpoint_available())
> - dbginfo.num_data_bps = 1;
> - else
> - dbginfo.num_data_bps = 0;
> - dbginfo.num_condition_regs = 0;
> - dbginfo.data_bp_alignment = sizeof(long);
> - dbginfo.sizeof_condition = 0;
> -#ifdef CONFIG_HAVE_HW_BREAKPOINT
> - dbginfo.features = PPC_DEBUG_FEATURE_DATA_BP_RANGE;
> - if (dawr_enabled())
> - dbginfo.features |= PPC_DEBUG_FEATURE_DATA_BP_DAWR;
> -#else
> - dbginfo.features = 0;
> -#endif /* CONFIG_HAVE_HW_BREAKPOINT */
> -#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
> + ppc_gethwdinfo(&dbginfo);
>
> if (copy_to_user(datavp, &dbginfo,
> sizeof(struct ppc_debug_info)))
> --
> 2.13.3
>