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powerpc/ptrace: Enable in transaction NT_PPC_VMX ptrace requests 

This patch enables in transaction NT_PPC_VMX ptrace requests. The
function vr_get which gets the running value of all VMX registers
and the function vr_set which sets the running value of of all VMX
registers work on the running set of VMX registers whose location
will be different if transaction is active. This patch makes these
functions adapt to situations when the transaction is active.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anshuman Khandual 2016-07-28 10:57:33 +08:00 committed by Michael Ellerman
parent 1ec8549d44
commit d844e27915
1 changed files with 87 additions and 3 deletions
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90
arch/powerpc/kernel/ptrace.c
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@ -518,10 +518,28 @@ static int vr_active(struct task_struct *target,
return target->thread.used_vr ? regset->n : 0;
}
/*
* When the transaction is active, 'transact_vr' holds the current running
* value of all the VMX registers and 'vr_state' holds the last checkpointed
* value of all the VMX registers for the current transaction to fall back
* on in case it aborts. When transaction is not active 'vr_state' holds
* the current running state of all the VMX registers. So this function which
* gets the current running values of all the VMX registers, needs to know
* whether any transaction is active or not.
*
* Userspace interface buffer layout:
*
* struct data {
* vector128 vr[32];
* vector128 vscr;
* vector128 vrsave;
* };
*/
static int vr_get(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct thread_vr_state *addr;
int ret;
flush_altivec_to_thread(target);
@ -529,8 +547,19 @@ static int vr_get(struct task_struct *target, const struct user_regset *regset,
BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) !=
offsetof(struct thread_vr_state, vr[32]));
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (MSR_TM_ACTIVE(target->thread.regs->msr)) {
flush_fp_to_thread(target);
flush_tmregs_to_thread(target);
addr = &target->thread.transact_vr;
} else {
addr = &target->thread.vr_state;
}
#else
addr = &target->thread.vr_state;
#endif
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.vr_state, 0,
addr, 0,
33 * sizeof(vector128));
if (!ret) {
/*
@ -541,7 +570,16 @@ static int vr_get(struct task_struct *target, const struct user_regset *regset,
u32 word;
} vrsave;
memset(&vrsave, 0, sizeof(vrsave));
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (MSR_TM_ACTIVE(target->thread.regs->msr))
vrsave.word = target->thread.transact_vrsave;
else
vrsave.word = target->thread.vrsave;
#else
vrsave.word = target->thread.vrsave;
#endif
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
33 * sizeof(vector128), -1);
}
@ -549,10 +587,28 @@ static int vr_get(struct task_struct *target, const struct user_regset *regset,
return ret;
}
/*
* When the transaction is active, 'transact_vr' holds the current running
* value of all the VMX registers and 'vr_state' holds the last checkpointed
* value of all the VMX registers for the current transaction to fall back
* on in case it aborts. When transaction is not active 'vr_state' holds
* the current running state of all the VMX registers. So this function which
* sets the current running values of all the VMX registers, needs to know
* whether any transaction is active or not.
*
* Userspace interface buffer layout:
*
* struct data {
* vector128 vr[32];
* vector128 vscr;
* vector128 vrsave;
* };
*/
static int vr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct thread_vr_state *addr;
int ret;
flush_altivec_to_thread(target);
@ -560,8 +616,19 @@ static int vr_set(struct task_struct *target, const struct user_regset *regset,
BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) !=
offsetof(struct thread_vr_state, vr[32]));
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (MSR_TM_ACTIVE(target->thread.regs->msr)) {
flush_fp_to_thread(target);
flush_tmregs_to_thread(target);
addr = &target->thread.transact_vr;
} else {
addr = &target->thread.vr_state;
}
#else
addr = &target->thread.vr_state;
#endif
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.vr_state, 0,
addr, 0,
33 * sizeof(vector128));
if (!ret && count > 0) {
/*
@ -572,11 +639,28 @@ static int vr_set(struct task_struct *target, const struct user_regset *regset,
u32 word;
} vrsave;
memset(&vrsave, 0, sizeof(vrsave));
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (MSR_TM_ACTIVE(target->thread.regs->msr))
vrsave.word = target->thread.transact_vrsave;
else
vrsave.word = target->thread.vrsave;
#else
vrsave.word = target->thread.vrsave;
#endif
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
33 * sizeof(vector128), -1);
if (!ret)
if (!ret) {
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (MSR_TM_ACTIVE(target->thread.regs->msr))
target->thread.transact_vrsave = vrsave.word;
else
target->thread.vrsave = vrsave.word;
#else
target->thread.vrsave = vrsave.word;
#endif
}
}
return ret;