sparc,sparc64: unify kernel/

o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1090 insertions, 0 deletions

diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c
new file mode 100644
index 00000000000..a941c610e7c
--- /dev/null
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -0,0 +1,1090 @@
+/* ptrace.c: Sparc process tracing support.
+ *
+ * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ *
+ * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
+ * and David Mosberger.
+ *
+ * Added Linux support -miguel (weird, eh?, the original code was meant
+ * to emulate SunOS).
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/security.h>
+#include <linux/seccomp.h>
+#include <linux/audit.h>
+#include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <linux/compat.h>
+#include <linux/elf.h>
+
+#include <asm/asi.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/psrcompat.h>
+#include <asm/visasm.h>
+#include <asm/spitfire.h>
+#include <asm/page.h>
+#include <asm/cpudata.h>
+#include <asm/cacheflush.h>
+
+#include "entry.h"
+
+/* #define ALLOW_INIT_TRACING */
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+	/* nothing to do */
+}
+
+/* To get the necessary page struct, access_process_vm() first calls
+ * get_user_pages().  This has done a flush_dcache_page() on the
+ * accessed page.  Then our caller (copy_{to,from}_user_page()) did
+ * to memcpy to read/write the data from that page.
+ *
+ * Now, the only thing we have to do is:
+ * 1) flush the D-cache if it's possible than an illegal alias
+ *    has been created
+ * 2) flush the I-cache if this is pre-cheetah and we did a write
+ */
+void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
+			 unsigned long uaddr, void *kaddr,
+			 unsigned long len, int write)
+{
+	BUG_ON(len > PAGE_SIZE);
+
+	if (tlb_type == hypervisor)
+		return;
+
+	preempt_disable();
+
+#ifdef DCACHE_ALIASING_POSSIBLE
+	/* If bit 13 of the kernel address we used to access the
+	 * user page is the same as the virtual address that page
+	 * is mapped to in the user's address space, we can skip the
+	 * D-cache flush.
+	 */
+	if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
+		unsigned long start = __pa(kaddr);
+		unsigned long end = start + len;
+		unsigned long dcache_line_size;
+
+		dcache_line_size = local_cpu_data().dcache_line_size;
+
+		if (tlb_type == spitfire) {
+			for (; start < end; start += dcache_line_size)
+				spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
+		} else {
+			start &= ~(dcache_line_size - 1);
+			for (; start < end; start += dcache_line_size)
+				__asm__ __volatile__(
+					"stxa %%g0, [%0] %1\n\t"
+					"membar #Sync"
+					: /* no outputs */
+					: "r" (start),
+					"i" (ASI_DCACHE_INVALIDATE));
+		}
+	}
+#endif
+	if (write && tlb_type == spitfire) {
+		unsigned long start = (unsigned long) kaddr;
+		unsigned long end = start + len;
+		unsigned long icache_line_size;
+
+		icache_line_size = local_cpu_data().icache_line_size;
+
+		for (; start < end; start += icache_line_size)
+			flushi(start);
+	}
+
+	preempt_enable();
+}
+
+static int get_from_target(struct task_struct *target, unsigned long uaddr,
+			   void *kbuf, int len)
+{
+	if (target == current) {
+		if (copy_from_user(kbuf, (void __user *) uaddr, len))
+			return -EFAULT;
+	} else {
+		int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
+		if (len2 != len)
+			return -EFAULT;
+	}
+	return 0;
+}
+
+static int set_to_target(struct task_struct *target, unsigned long uaddr,
+			 void *kbuf, int len)
+{
+	if (target == current) {
+		if (copy_to_user((void __user *) uaddr, kbuf, len))
+			return -EFAULT;
+	} else {
+		int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
+		if (len2 != len)
+			return -EFAULT;
+	}
+	return 0;
+}
+
+static int regwindow64_get(struct task_struct *target,
+			   const struct pt_regs *regs,
+			   struct reg_window *wbuf)
+{
+	unsigned long rw_addr = regs->u_regs[UREG_I6];
+
+	if (test_tsk_thread_flag(current, TIF_32BIT)) {
+		struct reg_window32 win32;
+		int i;
+
+		if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
+			return -EFAULT;
+		for (i = 0; i < 8; i++)
+			wbuf->locals[i] = win32.locals[i];
+		for (i = 0; i < 8; i++)
+			wbuf->ins[i] = win32.ins[i];
+	} else {
+		rw_addr += STACK_BIAS;
+		if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int regwindow64_set(struct task_struct *target,
+			   const struct pt_regs *regs,
+			   struct reg_window *wbuf)
+{
+	unsigned long rw_addr = regs->u_regs[UREG_I6];
+
+	if (test_tsk_thread_flag(current, TIF_32BIT)) {
+		struct reg_window32 win32;
+		int i;
+
+		for (i = 0; i < 8; i++)
+			win32.locals[i] = wbuf->locals[i];
+		for (i = 0; i < 8; i++)
+			win32.ins[i] = wbuf->ins[i];
+
+		if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
+			return -EFAULT;
+	} else {
+		rw_addr += STACK_BIAS;
+		if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+enum sparc_regset {
+	REGSET_GENERAL,
+	REGSET_FP,
+};
+
+static int genregs64_get(struct task_struct *target,
+			 const struct user_regset *regset,
+			 unsigned int pos, unsigned int count,
+			 void *kbuf, void __user *ubuf)
+{
+	const struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	if (target == current)
+		flushw_user();
+
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				  regs->u_regs,
+				  0, 16 * sizeof(u64));
+	if (!ret && count && pos < (32 * sizeof(u64))) {
+		struct reg_window window;
+
+		if (regwindow64_get(target, regs, &window))
+			return -EFAULT;
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &window,
+					  16 * sizeof(u64),
+					  32 * sizeof(u64));
+	}
+
+	if (!ret) {
+		/* TSTATE, TPC, TNPC */
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &regs->tstate,
+					  32 * sizeof(u64),
+					  35 * sizeof(u64));
+	}
+
+	if (!ret) {
+		unsigned long y = regs->y;
+
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &y,
+					  35 * sizeof(u64),
+					  36 * sizeof(u64));
+	}
+
+	if (!ret) {
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       36 * sizeof(u64), -1);
+
+	}
+	return ret;
+}
+
+static int genregs64_set(struct task_struct *target,
+			 const struct user_regset *regset,
+			 unsigned int pos, unsigned int count,
+			 const void *kbuf, const void __user *ubuf)
+{
+	struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	if (target == current)
+		flushw_user();
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 regs->u_regs,
+				 0, 16 * sizeof(u64));
+	if (!ret && count && pos < (32 * sizeof(u64))) {
+		struct reg_window window;
+
+		if (regwindow64_get(target, regs, &window))
+			return -EFAULT;
+
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &window,
+					 16 * sizeof(u64),
+					 32 * sizeof(u64));
+
+		if (!ret &&
+		    regwindow64_set(target, regs, &window))
+			return -EFAULT;
+	}
+
+	if (!ret && count > 0) {
+		unsigned long tstate;
+
+		/* TSTATE */
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &tstate,
+					 32 * sizeof(u64),
+					 33 * sizeof(u64));
+		if (!ret) {
+			/* Only the condition codes and the "in syscall"
+			 * state can be modified in the %tstate register.
+			 */
+			tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+			regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+			regs->tstate |= tstate;
+		}
+	}
+
+	if (!ret) {
+		/* TPC, TNPC */
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &regs->tpc,
+					 33 * sizeof(u64),
+					 35 * sizeof(u64));
+	}
+
+	if (!ret) {
+		unsigned long y;
+
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &y,
+					 35 * sizeof(u64),
+					 36 * sizeof(u64));
+		if (!ret)
+			regs->y = y;
+	}
+
+	if (!ret)
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						36 * sizeof(u64), -1);
+
+	return ret;
+}
+
+static int fpregs64_get(struct task_struct *target,
+			const struct user_regset *regset,
+			unsigned int pos, unsigned int count,
+			void *kbuf, void __user *ubuf)
+{
+	const unsigned long *fpregs = task_thread_info(target)->fpregs;
+	unsigned long fprs, fsr, gsr;
+	int ret;
+
+	if (target == current)
+		save_and_clear_fpu();
+
+	fprs = task_thread_info(target)->fpsaved[0];
+
+	if (fprs & FPRS_DL)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  fpregs,
+					  0, 16 * sizeof(u64));
+	else
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       0,
+					       16 * sizeof(u64));
+
+	if (!ret) {
+		if (fprs & FPRS_DU)
+			ret = user_regset_copyout(&pos, &count,
+						  &kbuf, &ubuf,
+						  fpregs + 16,
+						  16 * sizeof(u64),
+						  32 * sizeof(u64));
+		else
+			ret = user_regset_copyout_zero(&pos, &count,
+						       &kbuf, &ubuf,
+						       16 * sizeof(u64),
+						       32 * sizeof(u64));
+	}
+
+	if (fprs & FPRS_FEF) {
+		fsr = task_thread_info(target)->xfsr[0];
+		gsr = task_thread_info(target)->gsr[0];
+	} else {
+		fsr = gsr = 0;
+	}
+
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &fsr,
+					  32 * sizeof(u64),
+					  33 * sizeof(u64));
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &gsr,
+					  33 * sizeof(u64),
+					  34 * sizeof(u64));
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &fprs,
+					  34 * sizeof(u64),
+					  35 * sizeof(u64));
+
+	if (!ret)
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       35 * sizeof(u64), -1);
+
+	return ret;
+}
+
+static int fpregs64_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 *fpregs = task_thread_info(target)->fpregs;
+	unsigned long fprs;
+	int ret;
+
+	if (target == current)
+		save_and_clear_fpu();
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 fpregs,
+				 0, 32 * sizeof(u64));
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 task_thread_info(target)->xfsr,
+					 32 * sizeof(u64),
+					 33 * sizeof(u64));
+	if (!ret)
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 task_thread_info(target)->gsr,
+					 33 * sizeof(u64),
+					 34 * sizeof(u64));
+
+	fprs = task_thread_info(target)->fpsaved[0];
+	if (!ret && count > 0) {
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &fprs,
+					 34 * sizeof(u64),
+					 35 * sizeof(u64));
+	}
+
+	fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
+	task_thread_info(target)->fpsaved[0] = fprs;
+
+	if (!ret)
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						35 * sizeof(u64), -1);
+	return ret;
+}
+
+static const struct user_regset sparc64_regsets[] = {
+	/* Format is:
+	 * 	G0 --> G7
+	 *	O0 --> O7
+	 *	L0 --> L7
+	 *	I0 --> I7
+	 *	TSTATE, TPC, TNPC, Y
+	 */
+	[REGSET_GENERAL] = {
+		.core_note_type = NT_PRSTATUS,
+		.n = 36,
+		.size = sizeof(u64), .align = sizeof(u64),
+		.get = genregs64_get, .set = genregs64_set
+	},
+	/* Format is:
+	 *	F0 --> F63
+	 *	FSR
+	 *	GSR
+	 *	FPRS
+	 */
+	[REGSET_FP] = {
+		.core_note_type = NT_PRFPREG,
+		.n = 35,
+		.size = sizeof(u64), .align = sizeof(u64),
+		.get = fpregs64_get, .set = fpregs64_set
+	},
+};
+
+static const struct user_regset_view user_sparc64_view = {
+	.name = "sparc64", .e_machine = EM_SPARCV9,
+	.regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
+};
+
+#ifdef CONFIG_COMPAT
+static int genregs32_get(struct task_struct *target,
+			 const struct user_regset *regset,
+			 unsigned int pos, unsigned int count,
+			 void *kbuf, void __user *ubuf)
+{
+	const struct pt_regs *regs = task_pt_regs(target);
+	compat_ulong_t __user *reg_window;
+	compat_ulong_t *k = kbuf;
+	compat_ulong_t __user *u = ubuf;
+	compat_ulong_t reg;
+
+	if (target == current)
+		flushw_user();
+
+	pos /= sizeof(reg);
+	count /= sizeof(reg);
+
+	if (kbuf) {
+		for (; count > 0 && pos < 16; count--)
+			*k++ = regs->u_regs[pos++];
+
+		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		if (target == current) {
+			for (; count > 0 && pos < 32; count--) {
+				if (get_user(*k++, &reg_window[pos++]))
+					return -EFAULT;
+			}
+		} else {
+			for (; count > 0 && pos < 32; count--) {
+				if (access_process_vm(target,
+						      (unsigned long)
+						      &reg_window[pos],
+						      k, sizeof(*k), 0)
+				    != sizeof(*k))
+					return -EFAULT;
+				k++;
+				pos++;
+			}
+		}
+	} else {
+		for (; count > 0 && pos < 16; count--) {
+			if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
+				return -EFAULT;
+		}
+
+		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		if (target == current) {
+			for (; count > 0 && pos < 32; count--) {
+				if (get_user(reg, &reg_window[pos++]) ||
+				    put_user(reg, u++))
+					return -EFAULT;
+			}
+		} else {
+			for (; count > 0 && pos < 32; count--) {
+				if (access_process_vm(target,
+						      (unsigned long)
+						      &reg_window[pos],
+						      &reg, sizeof(reg), 0)
+				    != sizeof(reg))
+					return -EFAULT;
+				if (access_process_vm(target,
+						      (unsigned long) u,
+						      &reg, sizeof(reg), 1)
+				    != sizeof(reg))
+					return -EFAULT;
+				pos++;
+				u++;
+			}
+		}
+	}
+	while (count > 0) {
+		switch (pos) {
+		case 32: /* PSR */
+			reg = tstate_to_psr(regs->tstate);
+			break;
+		case 33: /* PC */
+			reg = regs->tpc;
+			break;
+		case 34: /* NPC */
+			reg = regs->tnpc;
+			break;
+		case 35: /* Y */
+			reg = regs->y;
+			break;
+		case 36: /* WIM */
+		case 37: /* TBR */
+			reg = 0;
+			break;
+		default:
+			goto finish;
+		}
+
+		if (kbuf)
+			*k++ = reg;
+		else if (put_user(reg, u++))
+			return -EFAULT;
+		pos++;
+		count--;
+	}
+finish:
+	pos *= sizeof(reg);
+	count *= sizeof(reg);
+
+	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					38 * sizeof(reg), -1);
+}
+
+static int genregs32_set(struct task_struct *target,
+			 const struct user_regset *regset,
+			 unsigned int pos, unsigned int count,
+			 const void *kbuf, const void __user *ubuf)
+{
+	struct pt_regs *regs = task_pt_regs(target);
+	compat_ulong_t __user *reg_window;
+	const compat_ulong_t *k = kbuf;
+	const compat_ulong_t __user *u = ubuf;
+	compat_ulong_t reg;
+
+	if (target == current)
+		flushw_user();
+
+	pos /= sizeof(reg);
+	count /= sizeof(reg);
+
+	if (kbuf) {
+		for (; count > 0 && pos < 16; count--)
+			regs->u_regs[pos++] = *k++;
+
+		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		if (target == current) {
+			for (; count > 0 && pos < 32; count--) {
+				if (put_user(*k++, &reg_window[pos++]))
+					return -EFAULT;
+			}
+		} else {
+			for (; count > 0 && pos < 32; count--) {
+				if (access_process_vm(target,
+						      (unsigned long)
+						      &reg_window[pos],
+						      (void *) k,
+						      sizeof(*k), 1)
+				    != sizeof(*k))
+					return -EFAULT;
+				k++;
+				pos++;
+			}
+		}
+	} else {
+		for (; count > 0 && pos < 16; count--) {
+			if (get_user(reg, u++))
+				return -EFAULT;
+			regs->u_regs[pos++] = reg;
+		}
+
+		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		if (target == current) {
+			for (; count > 0 && pos < 32; count--) {
+				if (get_user(reg, u++) ||
+				    put_user(reg, &reg_window[pos++]))
+					return -EFAULT;
+			}
+		} else {
+			for (; count > 0 && pos < 32; count--) {
+				if (access_process_vm(target,
+						      (unsigned long)
+						      u,
+						      &reg, sizeof(reg), 0)
+				    != sizeof(reg))
+					return -EFAULT;
+				if (access_process_vm(target,
+						      (unsigned long)
+						      &reg_window[pos],
+						      &reg, sizeof(reg), 1)
+				    != sizeof(reg))
+					return -EFAULT;
+				pos++;
+				u++;
+			}
+		}
+	}
+	while (count > 0) {
+		unsigned long tstate;
+
+		if (kbuf)
+			reg = *k++;
+		else if (get_user(reg, u++))
+			return -EFAULT;
+
+		switch (pos) {
+		case 32: /* PSR */
+			tstate = regs->tstate;
+			tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+			tstate |= psr_to_tstate_icc(reg);
+			if (reg & PSR_SYSCALL)
+				tstate |= TSTATE_SYSCALL;
+			regs->tstate = tstate;
+			break;
+		case 33: /* PC */
+			regs->tpc = reg;
+			break;
+		case 34: /* NPC */
+			regs->tnpc = reg;
+			break;
+		case 35: /* Y */
+			regs->y = reg;
+			break;
+		case 36: /* WIM */
+		case 37: /* TBR */
+			break;
+		default:
+			goto finish;
+		}
+
+		pos++;
+		count--;
+	}
+finish:
+	pos *= sizeof(reg);
+	count *= sizeof(reg);
+
+	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+					 38 * sizeof(reg), -1);
+}
+
+static int fpregs32_get(struct task_struct *target,
+			const struct user_regset *regset,
+			unsigned int pos, unsigned int count,
+			void *kbuf, void __user *ubuf)
+{
+	const unsigned long *fpregs = task_thread_info(target)->fpregs;
+	compat_ulong_t enabled;
+	unsigned long fprs;
+	compat_ulong_t fsr;
+	int ret = 0;
+
+	if (target == current)
+		save_and_clear_fpu();
+
+	fprs = task_thread_info(target)->fpsaved[0];
+	if (fprs & FPRS_FEF) {
+		fsr = task_thread_info(target)->xfsr[0];
+		enabled = 1;
+	} else {
+		fsr = 0;
+		enabled = 0;
+	}
+
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				  fpregs,
+				  0, 32 * sizeof(u32));
+
+	if (!ret)
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       32 * sizeof(u32),
+					       33 * sizeof(u32));
+	if (!ret)
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &fsr,
+					  33 * sizeof(u32),
+					  34 * sizeof(u32));
+
+	if (!ret) {
+		compat_ulong_t val;
+
+		val = (enabled << 8) | (8 << 16);
+		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					  &val,
+					  34 * sizeof(u32),
+					  35 * sizeof(u32));
+	}
+
+	if (!ret)
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					       35 * sizeof(u32), -1);
+
+	return ret;
+}
+
+static int fpregs32_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 *fpregs = task_thread_info(target)->fpregs;
+	unsigned long fprs;
+	int ret;
+
+	if (target == current)
+		save_and_clear_fpu();
+
+	fprs = task_thread_info(target)->fpsaved[0];
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 fpregs,
+				 0, 32 * sizeof(u32));
+	if (!ret)
+		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+					  32 * sizeof(u32),
+					  33 * sizeof(u32));
+	if (!ret && count > 0) {
+		compat_ulong_t fsr;
+		unsigned long val;
+
+		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					 &fsr,
+					 33 * sizeof(u32),
+					 34 * sizeof(u32));
+		if (!ret) {
+			val = task_thread_info(target)->xfsr[0];
+			val &= 0xffffffff00000000UL;
+			val |= fsr;
+			task_thread_info(target)->xfsr[0] = val;
+		}
+	}
+
+	fprs |= (FPRS_FEF | FPRS_DL);
+	task_thread_info(target)->fpsaved[0] = fprs;
+
+	if (!ret)
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						34 * sizeof(u32), -1);
+	return ret;
+}
+
+static const struct user_regset sparc32_regsets[] = {
+	/* Format is:
+	 * 	G0 --> G7
+	 *	O0 --> O7
+	 *	L0 --> L7
+	 *	I0 --> I7
+	 *	PSR, PC, nPC, Y, WIM, TBR
+	 */
+	[REGSET_GENERAL] = {
+		.core_note_type = NT_PRSTATUS,
+		.n = 38,
+		.size = sizeof(u32), .align = sizeof(u32),
+		.get = genregs32_get, .set = genregs32_set
+	},
+	/* Format is:
+	 *	F0 --> F31
+	 *	empty 32-bit word
+	 *	FSR (32--bit word)
+	 *	FPU QUEUE COUNT (8-bit char)
+	 *	FPU QUEUE ENTRYSIZE (8-bit char)
+	 *	FPU ENABLED (8-bit char)
+	 *	empty 8-bit char
+	 *	FPU QUEUE (64 32-bit ints)
+	 */
+	[REGSET_FP] = {
+		.core_note_type = NT_PRFPREG,
+		.n = 99,
+		.size = sizeof(u32), .align = sizeof(u32),
+		.get = fpregs32_get, .set = fpregs32_set
+	},
+};
+
+static const struct user_regset_view user_sparc32_view = {
+	.name = "sparc", .e_machine = EM_SPARC,
+	.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
+};
+#endif /* CONFIG_COMPAT */
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_COMPAT
+	if (test_tsk_thread_flag(task, TIF_32BIT))
+		return &user_sparc32_view;
+#endif
+	return &user_sparc64_view;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_fps {
+	unsigned int regs[32];
+	unsigned int fsr;
+	unsigned int flags;
+	unsigned int extra;
+	unsigned int fpqd;
+	struct compat_fq {
+		unsigned int insnaddr;
+		unsigned int insn;
+	} fpq[16];
+};
+
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+			compat_ulong_t caddr, compat_ulong_t cdata)
+{
+	const struct user_regset_view *view = task_user_regset_view(current);
+	compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
+	struct pt_regs32 __user *pregs;
+	struct compat_fps __user *fps;
+	unsigned long addr2 = caddr2;
+	unsigned long addr = caddr;
+	unsigned long data = cdata;
+	int ret;
+
+	pregs = (struct pt_regs32 __user *) addr;
+	fps = (struct compat_fps __user *) addr;
+
+	switch (request) {
+	case PTRACE_PEEKUSR:
+		ret = (addr != 0) ? -EIO : 0;
+		break;
+
+	case PTRACE_GETREGS:
+		ret = copy_regset_to_user(child, view, REGSET_GENERAL,
+					  32 * sizeof(u32),
+					  4 * sizeof(u32),
+					  &pregs->psr);
+		if (!ret)
+			ret = copy_regset_to_user(child, view, REGSET_GENERAL,
+						  1 * sizeof(u32),
+						  15 * sizeof(u32),
+						  &pregs->u_regs[0]);
+		break;
+
+	case PTRACE_SETREGS:
+		ret = copy_regset_from_user(child, view, REGSET_GENERAL,
+					    32 * sizeof(u32),
+					    4 * sizeof(u32),
+					    &pregs->psr);
+		if (!ret)
+			ret = copy_regset_from_user(child, view, REGSET_GENERAL,
+						    1 * sizeof(u32),
+						    15 * sizeof(u32),
+						    &pregs->u_regs[0]);
+		break;
+
+	case PTRACE_GETFPREGS:
+		ret = copy_regset_to_user(child, view, REGSET_FP,
+					  0 * sizeof(u32),
+					  32 * sizeof(u32),
+					  &fps->regs[0]);
+		if (!ret)
+			ret = copy_regset_to_user(child, view, REGSET_FP,
+						  33 * sizeof(u32),
+						  1 * sizeof(u32),
+						  &fps->fsr);
+		if (!ret) {
+			if (__put_user(0, &fps->flags) ||
+			    __put_user(0, &fps->extra) ||
+			    __put_user(0, &fps->fpqd) ||
+			    clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
+				ret = -EFAULT;
+		}
+		break;
+
+	case PTRACE_SETFPREGS:
+		ret = copy_regset_from_user(child, view, REGSET_FP,
+					    0 * sizeof(u32),
+					    32 * sizeof(u32),
+					    &fps->regs[0]);
+		if (!ret)
+			ret = copy_regset_from_user(child, view, REGSET_FP,
+						    33 * sizeof(u32),
+						    1 * sizeof(u32),
+						    &fps->fsr);
+		break;
+
+	case PTRACE_READTEXT:
+	case PTRACE_READDATA:
+		ret = ptrace_readdata(child, addr,
+				      (char __user *)addr2, data);
+		if (ret == data)
+			ret = 0;
+		else if (ret >= 0)
+			ret = -EIO;
+		break;
+
+	case PTRACE_WRITETEXT:
+	case PTRACE_WRITEDATA:
+		ret = ptrace_writedata(child, (char __user *) addr2,
+				       addr, data);
+		if (ret == data)
+			ret = 0;
+		else if (ret >= 0)
+			ret = -EIO;
+		break;
+
+	default:
+		if (request == PTRACE_SPARC_DETACH)
+			request = PTRACE_DETACH;
+		ret = compat_ptrace_request(child, request, addr, data);
+		break;
+	}
+
+	return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+struct fps {
+	unsigned int regs[64];
+	unsigned long fsr;
+};
+
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+	const struct user_regset_view *view = task_user_regset_view(current);
+	unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
+	struct pt_regs __user *pregs;
+	struct fps __user *fps;
+	int ret;
+
+	pregs = (struct pt_regs __user *) (unsigned long) addr;
+	fps = (struct fps __user *) (unsigned long) addr;
+
+	switch (request) {
+	case PTRACE_PEEKUSR:
+		ret = (addr != 0) ? -EIO : 0;
+		break;
+
+	case PTRACE_GETREGS64:
+		ret = copy_regset_to_user(child, view, REGSET_GENERAL,
+					  1 * sizeof(u64),
+					  15 * sizeof(u64),
+					  &pregs->u_regs[0]);
+		if (!ret) {
+			/* XXX doesn't handle 'y' register correctly XXX */
+			ret = copy_regset_to_user(child, view, REGSET_GENERAL,
+						  32 * sizeof(u64),
+						  4 * sizeof(u64),
+						  &pregs->tstate);
+		}
+		break;
+
+	case PTRACE_SETREGS64:
+		ret = copy_regset_from_user(child, view, REGSET_GENERAL,
+					    1 * sizeof(u64),
+					    15 * sizeof(u64),
+					    &pregs->u_regs[0]);
+		if (!ret) {
+			/* XXX doesn't handle 'y' register correctly XXX */
+			ret = copy_regset_from_user(child, view, REGSET_GENERAL,
+						    32 * sizeof(u64),
+						    4 * sizeof(u64),
+						    &pregs->tstate);
+		}
+		break;
+
+	case PTRACE_GETFPREGS64:
+		ret = copy_regset_to_user(child, view, REGSET_FP,
+					  0 * sizeof(u64),
+					  33 * sizeof(u64),
+					  fps);
+		break;
+
+	case PTRACE_SETFPREGS64:
+		ret = copy_regset_from_user(child, view, REGSET_FP,
+					  0 * sizeof(u64),
+					  33 * sizeof(u64),
+					  fps);
+		break;
+
+	case PTRACE_READTEXT:
+	case PTRACE_READDATA:
+		ret = ptrace_readdata(child, addr,
+				      (char __user *)addr2, data);
+		if (ret == data)
+			ret = 0;
+		else if (ret >= 0)
+			ret = -EIO;
+		break;
+
+	case PTRACE_WRITETEXT:
+	case PTRACE_WRITEDATA:
+		ret = ptrace_writedata(child, (char __user *) addr2,
+				       addr, data);
+		if (ret == data)
+			ret = 0;
+		else if (ret >= 0)
+			ret = -EIO;
+		break;
+
+	default:
+		if (request == PTRACE_SPARC_DETACH)
+			request = PTRACE_DETACH;
+		ret = ptrace_request(child, request, addr, data);
+		break;
+	}
+
+	return ret;
+}
+
+asmlinkage int syscall_trace_enter(struct pt_regs *regs)
+{
+	int ret = 0;
+
+	/* do the secure computing check first */
+	secure_computing(regs->u_regs[UREG_G1]);
+
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		ret = tracehook_report_syscall_entry(regs);
+
+	if (unlikely(current->audit_context) && !ret)
+		audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
+				     AUDIT_ARCH_SPARC :
+				     AUDIT_ARCH_SPARC64),
+				    regs->u_regs[UREG_G1],
+				    regs->u_regs[UREG_I0],
+				    regs->u_regs[UREG_I1],
+				    regs->u_regs[UREG_I2],
+				    regs->u_regs[UREG_I3]);
+
+	return ret;
+}
+
+asmlinkage void syscall_trace_leave(struct pt_regs *regs)
+{
+	if (unlikely(current->audit_context)) {
+		unsigned long tstate = regs->tstate;
+		int result = AUDITSC_SUCCESS;
+
+		if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
+			result = AUDITSC_FAILURE;
+
+		audit_syscall_exit(result, regs->u_regs[UREG_I0]);
+	}
+
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, 0);
+}