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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>
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2 changed files with 47 additions and 0 deletions
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@ -1171,10 +1171,48 @@ static int s390_gs_cb_set(struct task_struct *target,
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{
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struct gs_cb *data = target->thread.gs_cb;
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if (!MACHINE_HAS_GS)
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return -ENODEV;
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if (!data) {
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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target->thread.gs_cb = data;
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}
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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data, 0, sizeof(struct gs_cb));
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}
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static int s390_gs_bc_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct gs_cb *data = target->thread.gs_bc_cb;
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if (!MACHINE_HAS_GS)
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return -ENODEV;
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if (!data)
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return -ENODATA;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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data, 0, sizeof(struct gs_cb));
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}
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static int s390_gs_bc_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct gs_cb *data = target->thread.gs_bc_cb;
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if (!MACHINE_HAS_GS)
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return -ENODEV;
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if (!data) {
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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target->thread.gs_bc_cb = data;
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}
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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data, 0, sizeof(struct gs_cb));
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}
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@ -1244,6 +1282,14 @@ static const struct user_regset s390_regsets[] = {
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.get = s390_gs_cb_get,
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.set = s390_gs_cb_set,
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},
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{
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.core_note_type = NT_S390_GS_BC,
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.n = sizeof(struct gs_cb) / sizeof(__u64),
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.size = sizeof(__u64),
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.align = sizeof(__u64),
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.get = s390_gs_bc_get,
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.set = s390_gs_bc_set,
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},
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};
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static const struct user_regset_view user_s390_view = {
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@ -410,6 +410,7 @@ typedef struct elf64_shdr {
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#define NT_S390_VXRS_LOW 0x309 /* s390 vector registers 0-15 upper half */
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#define NT_S390_VXRS_HIGH 0x30a /* s390 vector registers 16-31 */
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#define NT_S390_GS_CB 0x30b /* s390 guarded storage registers */
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#define NT_S390_GS_BC 0x30c /* s390 guarded storage broadcast control block */
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#define NT_ARM_VFP 0x400 /* ARM VFP/NEON registers */
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#define NT_ARM_TLS 0x401 /* ARM TLS register */
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#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */
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