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Commit c45dc900 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Michael Ellerman
Browse files

powerpc/ptrace: Enable NT_PPC_TM_CTAR, NT_PPC_TM_CPPR, NT_PPC_TM_CDSCR 



This patch enables support for all three TM checkpointed SPR
states related ELF core note  NT_PPC_TM_CTAR, NT_PPC_TM_CPPR,
NT_PPC_TM_CDSCR based ptrace requests through PTRACE_GETREGSET,
PTRACE_SETREGSET calls. This is achieved through adding three
new register sets REGSET_TM_CTAR, REGSET_TM_CPPR and
REGSET_TM_CDSCR in powerpc corresponding to the ELF core note
sections added. 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 08e1c01d

arch/powerpc/kernel/ptrace.c

+178 −0
Original line number Diff line number Diff line
@@ -1542,6 +1542,151 @@ static int tm_spr_set(struct task_struct *target, 
				 2 * sizeof(u64), 3 * sizeof(u64));

	return ret;

}



static int tm_tar_active(struct task_struct *target,

			 const struct user_regset *regset)

{

	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (MSR_TM_ACTIVE(target->thread.regs->msr))

		return regset->n;



	return 0;

}



static int tm_tar_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}



static int tm_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;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}



static int tm_ppr_active(struct task_struct *target,

			 const struct user_regset *regset)

{

	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (MSR_TM_ACTIVE(target->thread.regs->msr))

		return regset->n;



	return 0;

}





static int tm_ppr_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}



static int tm_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;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}



static int tm_dscr_active(struct task_struct *target,

			 const struct user_regset *regset)

{

	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (MSR_TM_ACTIVE(target->thread.regs->msr))

		return regset->n;



	return 0;

}



static int tm_dscr_get(struct task_struct *target,

		      const struct user_regset *regset,

		      unsigned int pos, unsigned int count,

		      void *kbuf, void __user *ubuf)

{

	int ret;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}



static int tm_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;



	if (!cpu_has_feature(CPU_FTR_TM))

		return -ENODEV;



	if (!MSR_TM_ACTIVE(target->thread.regs->msr))

		return -ENODATA;



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

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

	return ret;

}

#endif	/* CONFIG_PPC_TRANSACTIONAL_MEM */



/*
@@ -1565,6 +1710,9 @@ enum powerpc_regset { 
	REGSET_TM_CVMX,		/* TM checkpointed VMX registers */

	REGSET_TM_CVSX,		/* TM checkpointed VSX registers */

	REGSET_TM_SPR,		/* TM specific SPR registers */

	REGSET_TM_CTAR,		/* TM checkpointed TAR register */

	REGSET_TM_CPPR,		/* TM checkpointed PPR register */

	REGSET_TM_CDSCR,	/* TM checkpointed DSCR register */

#endif

};
@@ -1626,6 +1774,21 @@ static const struct user_regset native_regsets[] = { 
		.size = sizeof(u64), .align = sizeof(u64),

		.active = tm_spr_active, .get = tm_spr_get, .set = tm_spr_set

	},

	[REGSET_TM_CTAR] = {

		.core_note_type = NT_PPC_TM_CTAR, .n = 1,

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

		.active = tm_tar_active, .get = tm_tar_get, .set = tm_tar_set

	},

	[REGSET_TM_CPPR] = {

		.core_note_type = NT_PPC_TM_CPPR, .n = 1,

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

		.active = tm_ppr_active, .get = tm_ppr_get, .set = tm_ppr_set

	},

	[REGSET_TM_CDSCR] = {

		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,

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

		.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set

	},

#endif

};
@@ -1878,6 +2041,21 @@ static const struct user_regset compat_regsets[] = { 
		.size = sizeof(u64), .align = sizeof(u64),

		.active = tm_spr_active, .get = tm_spr_get, .set = tm_spr_set

	},

	[REGSET_TM_CTAR] = {

		.core_note_type = NT_PPC_TM_CTAR, .n = 1,

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

		.active = tm_tar_active, .get = tm_tar_get, .set = tm_tar_set

	},

	[REGSET_TM_CPPR] = {

		.core_note_type = NT_PPC_TM_CPPR, .n = 1,

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

		.active = tm_ppr_active, .get = tm_ppr_get, .set = tm_ppr_set

	},

	[REGSET_TM_CDSCR] = {

		.core_note_type = NT_PPC_TM_CDSCR, .n = 1,

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

		.active = tm_dscr_active, .get = tm_dscr_get, .set = tm_dscr_set

	},

#endif

};