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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-04-20 13:54:11 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-04-21 12:38:56 +0200 |
| commit | e525f8a6e696210d15f8b8277d4da12fc4add299 (patch) | |
| tree | 6f8e78dd19d3f53c34a7656d097b832f8272c62e /arch/s390 | |
| parent | aa824e1340e79d26976c9f942add29edf612a67b (diff) | |
| download | linux-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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 46 |
1 files changed, 46 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 = { |