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s390/ptrace: add runtime instrumention register get/set 

Add runtime instrumention register get and set which allows to read
and modify the runtime instrumention control block.

Signed-off-by: Alice Frosi <alice@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Alice Frosi 2017-09-14 12:36:03 +02:00 committed by Martin Schwidefsky
parent bb59c2da3f
commit 262832bc5a
2 changed files with 110 additions and 0 deletions
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109
arch/s390/kernel/ptrace.c
View File

@ -30,6 +30,9 @@
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include <asm/switch_to.h>
#include <asm/runtime_instr.h>
#include <asm/facility.h>
#include "entry.h"
#ifdef CONFIG_COMPAT
@ -1239,6 +1242,96 @@ static int s390_gs_bc_set(struct task_struct *target,
data, 0, sizeof(struct gs_cb));
}
static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
{
return (cb->rca & 0x1f) == 0 &&
(cb->roa & 0xfff) == 0 &&
(cb->rla & 0xfff) == 0xfff &&
cb->s == 1 &&
cb->k == 1 &&
cb->h == 0 &&
cb->reserved1 == 0 &&
cb->ps == 1 &&
cb->qs == 0 &&
cb->pc == 1 &&
cb->qc == 0 &&
cb->reserved2 == 0 &&
cb->key == PAGE_DEFAULT_KEY &&
cb->reserved3 == 0 &&
cb->reserved4 == 0 &&
cb->reserved5 == 0 &&
cb->reserved6 == 0 &&
cb->reserved7 == 0 &&
cb->reserved8 == 0 &&
cb->rla >= cb->roa &&
cb->rca >= cb->roa &&
cb->rca <= cb->rla+1 &&
cb->m < 3;
}
static int s390_runtime_instr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct runtime_instr_cb *data = target->thread.ri_cb;
if (!test_facility(64))
return -ENODEV;
if (!data)
return -ENODATA;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct runtime_instr_cb));
}
static int s390_runtime_instr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct runtime_instr_cb ri_cb = { }, *data = NULL;
int rc;
if (!test_facility(64))
return -ENODEV;
if (!target->thread.ri_cb) {
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
}
if (target->thread.ri_cb) {
if (target == current)
store_runtime_instr_cb(&ri_cb);
else
ri_cb = *target->thread.ri_cb;
}
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&ri_cb, 0, sizeof(struct runtime_instr_cb));
if (rc) {
kfree(data);
return -EFAULT;
}
if (!is_ri_cb_valid(&ri_cb)) {
kfree(data);
return -EINVAL;
}
preempt_disable();
if (!target->thread.ri_cb)
target->thread.ri_cb = data;
*target->thread.ri_cb = ri_cb;
if (target == current)
load_runtime_instr_cb(target->thread.ri_cb);
preempt_enable();
return 0;
}
static const struct user_regset s390_regsets[] = {
{
.core_note_type = NT_PRSTATUS,
@ -1312,6 +1405,14 @@ static const struct user_regset s390_regsets[] = {
.get = s390_gs_bc_get,
.set = s390_gs_bc_set,
},
{
.core_note_type = NT_S390_RI_CB,
.n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.get = s390_runtime_instr_get,
.set = s390_runtime_instr_set,
},
};
static const struct user_regset_view user_s390_view = {
@ -1548,6 +1649,14 @@ static const struct user_regset s390_compat_regsets[] = {
.get = s390_gs_cb_get,
.set = s390_gs_cb_set,
},
{
.core_note_type = NT_S390_RI_CB,
.n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.get = s390_runtime_instr_get,
.set = s390_runtime_instr_set,
},
};
static const struct user_regset_view user_s390_compat_view = {

1
include/uapi/linux/elf.h
View File

@ -411,6 +411,7 @@ typedef struct elf64_shdr {
#define NT_S390_VXRS_HIGH 0x30a /* s390 vector registers 16-31 */
#define NT_S390_GS_CB 0x30b /* s390 guarded storage registers */
#define NT_S390_GS_BC 0x30c /* s390 guarded storage broadcast control block */
#define NT_S390_RI_CB 0x30d /* s390 runtime instrumentation */
#define NT_ARM_VFP 0x400 /* ARM VFP/NEON registers */
#define NT_ARM_TLS 0x401 /* ARM TLS register */
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */