Commit 19cbcbf7 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Michael Ellerman

powerpc/ptrace: Enable support for NT_PPC_CFPR

This patch enables support for TM checkpointed FPR register
set ELF core note NT_PPC_CFPR based ptrace requests through
PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved
through adding a register set REGSET_CFPR in powerpc
corresponding to the ELF core note section added. It
implements the get, set and active functions for this new
register set added.
Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarSimon Guo <wei.guo.simon@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 25847fb1
...@@ -1032,6 +1032,121 @@ static int tm_cgpr_set(struct task_struct *target, ...@@ -1032,6 +1032,121 @@ static int tm_cgpr_set(struct task_struct *target,
return ret; return ret;
} }
/**
* tm_cfpr_active - get active number of registers in CFPR
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks for the active number of available
* regisers in transaction checkpointed FPR category.
*/
static int tm_cfpr_active(struct task_struct *target,
const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return 0;
return regset->n;
}
/**
* tm_cfpr_get - get CFPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy from.
* @ubuf: User buffer to copy into.
*
* This function gets in transaction checkpointed FPR registers.
*
* When the transaction is active 'fp_state' holds the checkpointed
* values for the current transaction to fall back on if it aborts
* in between. This function gets those checkpointed FPR registers.
* The userspace interface buffer layout is as follows.
*
* struct data {
* u64 fpr[32];
* u64 fpscr;
*};
*/
static int tm_cfpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
u64 buf[33];
int i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
flush_tmregs_to_thread(target);
/* copy to local buffer then write that out */
for (i = 0; i < 32 ; i++)
buf[i] = target->thread.TS_FPR(i);
buf[32] = target->thread.fp_state.fpscr;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
}
/**
* tm_cfpr_set - set CFPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets in transaction checkpointed FPR registers.
*
* When the transaction is active 'fp_state' holds the checkpointed
* FPR register values for the current transaction to fall back on
* if it aborts in between. This function sets these checkpointed
* FPR registers. The userspace interface buffer layout is as follows.
*
* struct data {
* u64 fpr[32];
* u64 fpscr;
*};
*/
static int tm_cfpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
u64 buf[33];
int i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
flush_tmregs_to_thread(target);
/* copy to local buffer then write that out */
i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
if (i)
return i;
for (i = 0; i < 32 ; i++)
target->thread.TS_FPR(i) = buf[i];
target->thread.fp_state.fpscr = buf[32];
return 0;
}
#endif #endif
/* /*
...@@ -1051,6 +1166,7 @@ enum powerpc_regset { ...@@ -1051,6 +1166,7 @@ enum powerpc_regset {
#endif #endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
REGSET_TM_CGPR, /* TM checkpointed GPR registers */ REGSET_TM_CGPR, /* TM checkpointed GPR registers */
REGSET_TM_CFPR, /* TM checkpointed FPR registers */
#endif #endif
}; };
...@@ -1092,6 +1208,11 @@ static const struct user_regset native_regsets[] = { ...@@ -1092,6 +1208,11 @@ static const struct user_regset native_regsets[] = {
.size = sizeof(long), .align = sizeof(long), .size = sizeof(long), .align = sizeof(long),
.active = tm_cgpr_active, .get = tm_cgpr_get, .set = tm_cgpr_set .active = tm_cgpr_active, .get = tm_cgpr_get, .set = tm_cgpr_set
}, },
[REGSET_TM_CFPR] = {
.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cfpr_active, .get = tm_cfpr_get, .set = tm_cfpr_set
},
#endif #endif
}; };
...@@ -1324,6 +1445,11 @@ static const struct user_regset compat_regsets[] = { ...@@ -1324,6 +1445,11 @@ static const struct user_regset compat_regsets[] = {
.active = tm_cgpr_active, .active = tm_cgpr_active,
.get = tm_cgpr32_get, .set = tm_cgpr32_set .get = tm_cgpr32_get, .set = tm_cgpr32_set
}, },
[REGSET_TM_CFPR] = {
.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cfpr_active, .get = tm_cfpr_get, .set = tm_cfpr_set
},
#endif #endif
}; };
......
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