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Commit e525f8a6 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent aa824e13

arch/s390/kernel/ptrace.c

+46 −0
Original line number Diff line number Diff line
@@ -1171,10 +1171,48 @@ static int s390_gs_cb_set(struct task_struct *target, 
{

	struct gs_cb *data = target->thread.gs_cb;



	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 = {

include/uapi/linux/elf.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */