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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-05-19 16:32:09 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-06-12 17:25:59 +0300 |
| commit | f5bbd7219891364a6ba1231cb751905045fd4466 (patch) | |
| tree | 070a5d8591ddb7a5e660ee6c49d43deba0179e2c /arch/s390/kernel | |
| parent | 53d7f25f09eb0ea7cb119d86590f3992656a6892 (diff) | |
| download | linux-f5bbd7219891364a6ba1231cb751905045fd4466.tar.xz | |
s390/ptrace: guarded storage regset for the current task
The regset functions for guarded storage are supposed to work on
the current task as well. For task == current add the required
load and store instructions for the guarded storage control block.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index 488c5bb8dc77..252ed61a128b 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -1160,6 +1160,8 @@ static int s390_gs_cb_get(struct task_struct *target, return -ENODEV; if (!data) return -ENODATA; + if (target == current) + save_gs_cb(data); return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, sizeof(struct gs_cb)); } @@ -1170,6 +1172,7 @@ static int s390_gs_cb_set(struct task_struct *target, const void *kbuf, const void __user *ubuf) { struct gs_cb *data = target->thread.gs_cb; + int rc; if (!MACHINE_HAS_GS) return -ENODEV; @@ -1177,10 +1180,18 @@ static int s390_gs_cb_set(struct task_struct *target, data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; + data->gsd = 25; target->thread.gs_cb = data; + if (target == current) + __ctl_set_bit(2, 4); + } else if (target == current) { + save_gs_cb(data); } - return user_regset_copyin(&pos, &count, &kbuf, &ubuf, - data, 0, sizeof(struct gs_cb)); + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct gs_cb)); + if (target == current) + restore_gs_cb(data); + return rc; } static int s390_gs_bc_get(struct task_struct *target, |