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s390/gs: add regset for the guarded storage broadcast control block 

The guarded storage interface allows to register a control block for
each thread that is activated with the guarded storage broadcast event.
To retrieve the complete state of a process from the kernel a register
set for the stored broadcast control block is required.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2017-04-20 13:54:11 +02:00
parent aa824e1340
commit e525f8a6e6
2 changed files with 47 additions and 0 deletions
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46
arch/s390/kernel/ptrace.c
View File

@ -1171,10 +1171,48 @@ static int s390_gs_cb_set(struct task_struct *target,
{
struct gs_cb *data = target->thread.gs_cb;
if (!MACHINE_HAS_GS)
return -ENODEV;
if (!data) {
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
target->thread.gs_cb = data;
}
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
static int s390_gs_bc_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct gs_cb *data = target->thread.gs_bc_cb;
if (!MACHINE_HAS_GS)
return -ENODEV;
if (!data)
return -ENODATA;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
static int s390_gs_bc_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct gs_cb *data = target->thread.gs_bc_cb;
if (!MACHINE_HAS_GS)
return -ENODEV;
if (!data) {
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
target->thread.gs_bc_cb = data;
}
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
@ -1244,6 +1282,14 @@ static const struct user_regset s390_regsets[] = {
.get = s390_gs_cb_get,
.set = s390_gs_cb_set,
},
{
.core_note_type = NT_S390_GS_BC,
.n = sizeof(struct gs_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.get = s390_gs_bc_get,
.set = s390_gs_bc_set,
},
};
static const struct user_regset_view user_s390_view = {

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

@ -410,6 +410,7 @@ typedef struct elf64_shdr {
#define NT_S390_VXRS_LOW 0x309 /* s390 vector registers 0-15 upper half */
#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_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 */