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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2017-04-20 13:54:11 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-04-21 12:38:56 +0200
commite525f8a6e696210d15f8b8277d4da12fc4add299 (patch)
tree6f8e78dd19d3f53c34a7656d097b832f8272c62e
parentaa824e1340e79d26976c9f942add29edf612a67b (diff)
downloadlinux-e525f8a6e696210d15f8b8277d4da12fc4add299.tar.bz2
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>
-rw-r--r--arch/s390/kernel/ptrace.c46
-rw-r--r--include/uapi/linux/elf.h1
2 files changed, 47 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index c933e255b5d5..488c5bb8dc77 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -1173,8 +1173,46 @@ static int s390_gs_cb_set(struct task_struct *target,
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 = {
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 8c6d3bdb9a00..176b6cb1008d 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -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 */