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powerpc/ptrace: create ptrace_get_debugreg()

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Create ptrace_get_debugreg() to handle PTRACE_GET_DEBUGREG 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/c1482c41a39cc216f4073a51070d8680f52d5054.1582848567.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-02-28 00:14:47 +00:00 committed by Michael Ellerman
parent 323a780ca1
commit e08227d25a
4 changed files with 26 additions and 16 deletions
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9
arch/powerpc/kernel/ptrace/ptrace-adv.c
View File

@ -56,6 +56,15 @@ void user_disable_single_step(struct task_struct *task)
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}
int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
unsigned long __user *datalp)
{
/* We only support one DABR and no IABRS at the moment */
if (addr > 0)
return -EINVAL;
return put_user(child->thread.debug.dac1, datalp);
}
int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data)
{
#ifdef CONFIG_HAVE_HW_BREAKPOINT

2
arch/powerpc/kernel/ptrace/ptrace-decl.h
View File

@ -176,6 +176,8 @@ 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 */
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);
long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info);
long ppc_del_hwdebug(struct task_struct *child, long data);

13
arch/powerpc/kernel/ptrace/ptrace-noadv.c
View File

@ -39,6 +39,19 @@ void user_disable_single_step(struct task_struct *task)
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}
int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
unsigned long __user *datalp)
{
unsigned long dabr_fake;
/* We only support one DABR and no IABRS at the moment */
if (addr > 0)
return -EINVAL;
dabr_fake = ((child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
(child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
return put_user(dabr_fake, datalp);
}
int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, unsigned long data)
{
#ifdef CONFIG_HAVE_HW_BREAKPOINT

18
arch/powerpc/kernel/ptrace/ptrace.c
View File

@ -191,23 +191,9 @@ long arch_ptrace(struct task_struct *child, long request,
break;
}
case PTRACE_GET_DEBUGREG: {
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
unsigned long dabr_fake;
#endif
ret = -EINVAL;
/* We only support one DABR and no IABRS at the moment */
if (addr > 0)
break;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
ret = put_user(child->thread.debug.dac1, datalp);
#else
dabr_fake = ((child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
(child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
ret = put_user(dabr_fake, datalp);
#endif
case PTRACE_GET_DEBUGREG:
ret = ptrace_get_debugreg(child, addr, datalp);
break;
}
case PTRACE_SET_DEBUGREG:
ret = ptrace_set_debugreg(child, addr, data);