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Commit fa439810 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Michael Ellerman
Browse files

powerpc/ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR 



This patch enables support for running TAR, PPR, DSCR registers
related ELF core notes NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR based
ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls.
This is achieved through adding three new register sets REGSET_TAR,
REGSET_PPR, REGSET_DSCR in powerpc corresponding to the ELF core
note sections added in this regad. It implements the get, set and
active functions for all these new register sets added.

Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarSimon Guo <wei.guo.simon@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent c45dc900

arch/powerpc/kernel/ptrace.c

+117 −0
Original line number Diff line number Diff line
@@ -1689,6 +1689,78 @@ static int tm_dscr_set(struct task_struct *target, 
}

#endif	/* CONFIG_PPC_TRANSACTIONAL_MEM */



#ifdef CONFIG_PPC64

static int ppr_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,

				&target->thread.ppr, 0, sizeof(u64));

	return ret;

}



static int ppr_set(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      const void *kbuf, const void __user *ubuf)

{

	int ret;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

				&target->thread.ppr, 0, sizeof(u64));

	return ret;

}



static int dscr_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,

				&target->thread.dscr, 0, sizeof(u64));

	return ret;

}

static int dscr_set(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      const void *kbuf, const void __user *ubuf)

{

	int ret;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

				&target->thread.dscr, 0, sizeof(u64));

	return ret;

}

#endif

#ifdef CONFIG_PPC_BOOK3S_64

static int tar_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,

				&target->thread.tar, 0, sizeof(u64));

	return ret;

}

static int tar_set(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      const void *kbuf, const void __user *ubuf)

{

	int ret;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

				&target->thread.tar, 0, sizeof(u64));

	return ret;

}

#endif

/*

 * These are our native regset flavors.

 */
@@ -1714,6 +1786,13 @@ enum powerpc_regset { 
	REGSET_TM_CPPR,		/* TM checkpointed PPR register */

	REGSET_TM_CDSCR,	/* TM checkpointed DSCR register */

#endif

#ifdef CONFIG_PPC64

	REGSET_PPR,		/* PPR register */

	REGSET_DSCR,		/* DSCR register */

#endif

#ifdef CONFIG_PPC_BOOK3S_64

	REGSET_TAR,		/* TAR register */

#endif

};



static const struct user_regset native_regsets[] = {
@@ -1790,6 +1869,25 @@ static const struct user_regset native_regsets[] = { 
		.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set

	},

#endif

#ifdef CONFIG_PPC64

	[REGSET_PPR] = {

		.core_note_type = NT_PPC_PPR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = ppr_get, .set = ppr_set

	},

	[REGSET_DSCR] = {

		.core_note_type = NT_PPC_DSCR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = dscr_get, .set = dscr_set

	},

#endif

#ifdef CONFIG_PPC_BOOK3S_64

	[REGSET_TAR] = {

		.core_note_type = NT_PPC_TAR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = tar_get, .set = tar_set

	},

#endif

};



static const struct user_regset_view user_ppc_native_view = {
@@ -2057,6 +2155,25 @@ static const struct user_regset compat_regsets[] = { 
		.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set

	},

#endif

#ifdef CONFIG_PPC64

	[REGSET_PPR] = {

		.core_note_type = NT_PPC_PPR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = ppr_get, .set = ppr_set

	},

	[REGSET_DSCR] = {

		.core_note_type = NT_PPC_DSCR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = dscr_get, .set = dscr_set

	},

#endif

#ifdef CONFIG_PPC_BOOK3S_64

	[REGSET_TAR] = {

		.core_note_type = NT_PPC_TAR, .n = 1,

		.size = sizeof(u64), .align = sizeof(u64),

		.get = tar_get, .set = tar_set

	},

#endif

};



static const struct user_regset_view user_ppc_compat_view = {