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powerpc/ptrace: Enable NT_PPC_TM_CTAR, NT_PPC_TM_CPPR, NT_PPC_TM_CDSCR
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This patch enables support for all three TM checkpointed SPR
states related ELF core note  NT_PPC_TM_CTAR, NT_PPC_TM_CPPR,
NT_PPC_TM_CDSCR based ptrace requests through PTRACE_GETREGSET,
PTRACE_SETREGSET calls. This is achieved through adding three
new register sets REGSET_TM_CTAR, REGSET_TM_CPPR and
REGSET_TM_CDSCR in powerpc corresponding to the ELF core note
sections added. It implements the get, set and active functions
for all these new register sets added.

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>
Anshuman Khandual authored and mpe committed Aug 1, 2016
1 parent 08e1c01 commit c45dc90
Showing 1 changed file with 178 additions and 0 deletions.
178 changes: 178 additions & 0 deletions arch/powerpc/kernel/ptrace.c
Original file line number Diff line number Diff line change
@@ -1542,6 +1542,151 @@ static int tm_spr_set(struct task_struct *target,
2 * sizeof(u64), 3 * sizeof(u64));
return ret;
}

static int tm_tar_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 regset->n;

return 0;
}

static int tm_tar_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_tar, 0, sizeof(u64));
return ret;
}

static int tm_tar_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_tar, 0, sizeof(u64));
return ret;
}

static int tm_ppr_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 regset->n;

return 0;
}


static int tm_ppr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_ppr, 0, sizeof(u64));
return ret;
}

static int tm_ppr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_ppr, 0, sizeof(u64));
return ret;
}

static int tm_dscr_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 regset->n;

return 0;
}

static int tm_dscr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_dscr, 0, sizeof(u64));
return ret;
}

static int tm_dscr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;

if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;

if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;

ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_dscr, 0, sizeof(u64));
return ret;
}
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */

/*
@@ -1565,6 +1710,9 @@ enum powerpc_regset {
REGSET_TM_CVMX, /* TM checkpointed VMX registers */
REGSET_TM_CVSX, /* TM checkpointed VSX registers */
REGSET_TM_SPR, /* TM specific SPR registers */
REGSET_TM_CTAR, /* TM checkpointed TAR register */
REGSET_TM_CPPR, /* TM checkpointed PPR register */
REGSET_TM_CDSCR, /* TM checkpointed DSCR register */
#endif
};

@@ -1626,6 +1774,21 @@ static const struct user_regset native_regsets[] = {
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_spr_active, .get = tm_spr_get, .set = tm_spr_set
},
[REGSET_TM_CTAR] = {
.core_note_type = NT_PPC_TM_CTAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_tar_active, .get = tm_tar_get, .set = tm_tar_set
},
[REGSET_TM_CPPR] = {
.core_note_type = NT_PPC_TM_CPPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_ppr_active, .get = tm_ppr_get, .set = tm_ppr_set
},
[REGSET_TM_CDSCR] = {
.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set
},
#endif
};

@@ -1878,6 +2041,21 @@ static const struct user_regset compat_regsets[] = {
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_spr_active, .get = tm_spr_get, .set = tm_spr_set
},
[REGSET_TM_CTAR] = {
.core_note_type = NT_PPC_TM_CTAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_tar_active, .get = tm_tar_get, .set = tm_tar_set
},
[REGSET_TM_CPPR] = {
.core_note_type = NT_PPC_TM_CPPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_ppr_active, .get = tm_ppr_get, .set = tm_ppr_set
},
[REGSET_TM_CDSCR] = {
.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set
},
#endif
};

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