diff options
author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-01-26 14:10:34 +0100 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-03-22 08:14:25 +0100 |
commit | 916cda1aa1b412d7cf2991c3af7479544942d121 (patch) | |
tree | 51e373acacf962c1635899f1567484be0baed745 /arch/s390/kernel/ptrace.c | |
parent | 093b995e3b55a0ae0670226ddfcb05bfbf0099ae (diff) | |
download | linux-916cda1aa1b412d7cf2991c3af7479544942d121.tar.bz2 |
s390: add a system call for guarded storage
This adds a new system call to enable the use of guarded storage for
user space processes. The system call takes two arguments, a command
and pointer to a guarded storage control block:
s390_guarded_storage(int command, struct gs_cb *gs_cb);
The second argument is relevant only for the GS_SET_BC_CB command.
The commands in detail:
0 - GS_ENABLE
Enable the guarded storage facility for the current task. The
initial content of the guarded storage control block will be
all zeros. After the enablement the user space code can use
load-guarded-storage-controls instruction (LGSC) to load an
arbitrary control block. While a task is enabled the kernel
will save and restore the current content of the guarded
storage registers on context switch.
1 - GS_DISABLE
Disables the use of the guarded storage facility for the current
task. The kernel will cease to save and restore the content of
the guarded storage registers, the task specific content of
these registers is lost.
2 - GS_SET_BC_CB
Set a broadcast guarded storage control block. This is called
per thread and stores a specific guarded storage control block
in the task struct of the current task. This control block will
be used for the broadcast event GS_BROADCAST.
3 - GS_CLEAR_BC_CB
Clears the broadcast guarded storage control block. The guarded-
storage control block is removed from the task struct that was
established by GS_SET_BC_CB.
4 - GS_BROADCAST
Sends a broadcast to all thread siblings of the current task.
Every sibling that has established a broadcast guarded storage
control block will load this control block and will be enabled
for guarded storage. The broadcast guarded storage control block
is used up, a second broadcast without a refresh of the stored
control block with GS_SET_BC_CB will not have any effect.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
-rw-r--r-- | arch/s390/kernel/ptrace.c | 86 |
1 files changed, 72 insertions, 14 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index c14df0a1ec3c..c933e255b5d5 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -44,30 +44,42 @@ void update_cr_regs(struct task_struct *task) struct pt_regs *regs = task_pt_regs(task); struct thread_struct *thread = &task->thread; struct per_regs old, new; - + unsigned long cr0_old, cr0_new; + unsigned long cr2_old, cr2_new; + int cr0_changed, cr2_changed; + + __ctl_store(cr0_old, 0, 0); + __ctl_store(cr2_old, 2, 2); + cr0_new = cr0_old; + cr2_new = cr2_old; /* Take care of the enable/disable of transactional execution. */ if (MACHINE_HAS_TE) { - unsigned long cr, cr_new; - - __ctl_store(cr, 0, 0); /* Set or clear transaction execution TXC bit 8. */ - cr_new = cr | (1UL << 55); + cr0_new |= (1UL << 55); if (task->thread.per_flags & PER_FLAG_NO_TE) - cr_new &= ~(1UL << 55); - if (cr_new != cr) - __ctl_load(cr_new, 0, 0); + cr0_new &= ~(1UL << 55); /* Set or clear transaction execution TDC bits 62 and 63. */ - __ctl_store(cr, 2, 2); - cr_new = cr & ~3UL; + cr2_new &= ~3UL; if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) - cr_new |= 1UL; + cr2_new |= 1UL; else - cr_new |= 2UL; + cr2_new |= 2UL; } - if (cr_new != cr) - __ctl_load(cr_new, 2, 2); } + /* Take care of enable/disable of guarded storage. */ + if (MACHINE_HAS_GS) { + cr2_new &= ~(1UL << 4); + if (task->thread.gs_cb) + cr2_new |= (1UL << 4); + } + /* Load control register 0/2 iff changed */ + cr0_changed = cr0_new != cr0_old; + cr2_changed = cr2_new != cr2_old; + if (cr0_changed) + __ctl_load(cr0_new, 0, 0); + if (cr2_changed) + __ctl_load(cr2_new, 2, 2); /* Copy user specified PER registers */ new.control = thread->per_user.control; new.start = thread->per_user.start; @@ -1137,6 +1149,36 @@ static int s390_system_call_set(struct task_struct *target, data, 0, sizeof(unsigned int)); } +static int s390_gs_cb_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_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_cb_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_cb; + + if (!MACHINE_HAS_GS) + return -ENODEV; + if (!data) + return -ENODATA; + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct gs_cb)); +} + static const struct user_regset s390_regsets[] = { { .core_note_type = NT_PRSTATUS, @@ -1194,6 +1236,14 @@ static const struct user_regset s390_regsets[] = { .get = s390_vxrs_high_get, .set = s390_vxrs_high_set, }, + { + .core_note_type = NT_S390_GS_CB, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_cb_get, + .set = s390_gs_cb_set, + }, }; static const struct user_regset_view user_s390_view = { @@ -1422,6 +1472,14 @@ static const struct user_regset s390_compat_regsets[] = { .get = s390_compat_regs_high_get, .set = s390_compat_regs_high_set, }, + { + .core_note_type = NT_S390_GS_CB, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_cb_get, + .set = s390_gs_cb_set, + }, }; static const struct user_regset_view user_s390_compat_view = { |