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Commit fa8f5cb0 authored by Roland McGrath's avatar Roland McGrath Committed by Paul Mackerras
Browse files

[POWERPC] Add user_regset compat support 



This extends task_user_regset_view CONFIG_PPC64 with support for the
32-bit view of register state, compatible with what a CONFIG_PPC32
kernel provides.  This will enable generic machine-independent code to
access user-mode threads' registers for debugging and dumping.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 80fdf470

arch/powerpc/kernel/ptrace.c

+162 −0
Original line number Diff line number Diff line
@@ -501,8 +501,170 @@ static const struct user_regset_view user_ppc_native_view = { 
	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)

};



#ifdef CONFIG_PPC64

#include <linux/compat.h>



static int gpr32_get(struct task_struct *target,

		     const struct user_regset *regset,

		     unsigned int pos, unsigned int count,

		     void *kbuf, void __user *ubuf)

{

	const unsigned long *regs = &target->thread.regs->gpr[0];

	compat_ulong_t *k = kbuf;

	compat_ulong_t __user *u = ubuf;

	compat_ulong_t reg;



	if (target->thread.regs == NULL)

		return -EIO;



	CHECK_FULL_REGS(target->thread.regs);



	pos /= sizeof(reg);

	count /= sizeof(reg);



	if (kbuf)

		for (; count > 0 && pos < PT_MSR; --count)

			*k++ = regs[pos++];

	else

		for (; count > 0 && pos < PT_MSR; --count)

			if (__put_user((compat_ulong_t) regs[pos++], u++))

				return -EFAULT;



	if (count > 0 && pos == PT_MSR) {

		reg = get_user_msr(target);

		if (kbuf)

			*k++ = reg;

		else if (__put_user(reg, u++))

			return -EFAULT;

		++pos;

		--count;

	}



	if (kbuf)

		for (; count > 0 && pos < PT_REGS_COUNT; --count)

			*k++ = regs[pos++];

	else

		for (; count > 0 && pos < PT_REGS_COUNT; --count)

			if (__put_user((compat_ulong_t) regs[pos++], u++))

				return -EFAULT;



	kbuf = k;

	ubuf = u;

	pos *= sizeof(reg);

	count *= sizeof(reg);

	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,

					PT_REGS_COUNT * sizeof(reg), -1);

}



static int gpr32_set(struct task_struct *target,

		     const struct user_regset *regset,

		     unsigned int pos, unsigned int count,

		     const void *kbuf, const void __user *ubuf)

{

	unsigned long *regs = &target->thread.regs->gpr[0];

	const compat_ulong_t *k = kbuf;

	const compat_ulong_t __user *u = ubuf;

	compat_ulong_t reg;



	if (target->thread.regs == NULL)

		return -EIO;



	CHECK_FULL_REGS(target->thread.regs);



	pos /= sizeof(reg);

	count /= sizeof(reg);



	if (kbuf)

		for (; count > 0 && pos < PT_MSR; --count)

			regs[pos++] = *k++;

	else

		for (; count > 0 && pos < PT_MSR; --count) {

			if (__get_user(reg, u++))

				return -EFAULT;

			regs[pos++] = reg;

		}





	if (count > 0 && pos == PT_MSR) {

		if (kbuf)

			reg = *k++;

		else if (__get_user(reg, u++))

			return -EFAULT;

		set_user_msr(target, reg);

		++pos;

		--count;

	}



	if (kbuf)

		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)

			regs[pos++] = *k++;

	else

		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {

			if (__get_user(reg, u++))

				return -EFAULT;

			regs[pos++] = reg;

		}



	if (count > 0 && pos == PT_TRAP) {

		if (kbuf)

			reg = *k++;

		else if (__get_user(reg, u++))

			return -EFAULT;

		set_user_trap(target, reg);

		++pos;

		--count;

	}



	kbuf = k;

	ubuf = u;

	pos *= sizeof(reg);

	count *= sizeof(reg);

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,

					 (PT_TRAP + 1) * sizeof(reg), -1);

}



/*

 * These are the regset flavors matching the CONFIG_PPC32 native set.

 */

static const struct user_regset compat_regsets[] = {

	[REGSET_GPR] = {

		.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,

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

		.get = gpr32_get, .set = gpr32_set

	},

	[REGSET_FPR] = {

		.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,

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

		.get = fpr_get, .set = fpr_set

	},

#ifdef CONFIG_ALTIVEC

	[REGSET_VMX] = {

		.core_note_type = NT_PPC_VMX, .n = 34,

		.size = sizeof(vector128), .align = sizeof(vector128),

		.active = vr_active, .get = vr_get, .set = vr_set

	},

#endif

#ifdef CONFIG_SPE

	[REGSET_SPE] = {

		.n = 35,

		.size = sizeof(u32), .align = sizeof(u32),

		.active = evr_active, .get = evr_get, .set = evr_set

	},

#endif

};



static const struct user_regset_view user_ppc_compat_view = {

	.name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,

	.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)

};

#endif	/* CONFIG_PPC64 */



const struct user_regset_view *task_user_regset_view(struct task_struct *task)

{

#ifdef CONFIG_PPC64

	if (test_tsk_thread_flag(task, TIF_32BIT))

		return &user_ppc_compat_view;

#endif

	return &user_ppc_native_view;

}