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powerpc/ptrace: create ppc_gethwdinfo()

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Create ippc_gethwdinfo() to handle PPC_PTRACE_GETHWDBGINFO and
reduce ifdef mess

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/82fefcc1ec75b96cece792878217a5d85ecda0c2.1582848567.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-02-28 00:14:48 +00:00 committed by Michael Ellerman
parent e08227d25a
commit da529d4739
4 changed files with 37 additions and 31 deletions
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15
arch/powerpc/kernel/ptrace/ptrace-adv.c
View file

@ -56,6 +56,21 @@ void user_disable_single_step(struct task_struct *task)
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}
void ppc_gethwdinfo(struct ppc_debug_info *dbginfo)
{
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)
{

1
arch/powerpc/kernel/ptrace/ptrace-decl.h
View file

@ -176,6 +176,7 @@ 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);

20
arch/powerpc/kernel/ptrace/ptrace-noadv.c
View file

@ -39,6 +39,26 @@ 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)
{

32
arch/powerpc/kernel/ptrace/ptrace.c
View file

@ -139,37 +139,7 @@ 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)))