arch/sparc/kernel/ptrace_32.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* ptrace.c: Sparc process tracing support.
  *
  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
  *
  * 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/security.h>
 #include <linux/signal.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
 #include <linux/tracehook.h>

 #include <linux/uaccess.h>
 #include <asm/cacheflush.h>

 #include "kernel.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 */
 }

 enum sparc_regset {
 	REGSET_GENERAL,
 	REGSET_FP,
 };

 static int regwindow32_get(struct task_struct *target,
 			   const struct pt_regs *regs,
 			   u32 *uregs)
 {
 	unsigned long reg_window = regs->u_regs[UREG_I6];
 	int size = 16 * sizeof(u32);

 	if (target == current) {
 		if (copy_from_user(uregs, (void __user *)reg_window, size))
 			return -EFAULT;
 	} else {
 		if (access_process_vm(target, reg_window, uregs, size,
 				      FOLL_FORCE) != size)
 			return -EFAULT;
 	}
 	return 0;
 }

 static int regwindow32_set(struct task_struct *target,
 			   const struct pt_regs *regs,
 			   u32 *uregs)
 {
 	unsigned long reg_window = regs->u_regs[UREG_I6];
 	int size = 16 * sizeof(u32);

 	if (target == current) {
 		if (copy_to_user((void __user *)reg_window, uregs, size))
 			return -EFAULT;
 	} else {
 		if (access_process_vm(target, reg_window, uregs, size,
 				      FOLL_FORCE | FOLL_WRITE) != size)
 			return -EFAULT;
 	}
 	return 0;
 }

 static int genregs32_get(struct task_struct *target,
 			 const struct user_regset *regset,
 			 struct membuf to)
 {
 	const struct pt_regs *regs = target->thread.kregs;
 	u32 uregs[16];

 	if (target == current)
 		flush_user_windows();

 	membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
 	if (!to.left)
 		return 0;
 	if (regwindow32_get(target, regs, uregs))
 		return -EFAULT;
 	membuf_write(&to, uregs, 16 * sizeof(u32));
 	membuf_store(&to, regs->psr);
 	membuf_store(&to, regs->pc);
 	membuf_store(&to, regs->npc);
 	membuf_store(&to, regs->y);
 	return membuf_zero(&to, 2 * sizeof(u32));
 }

 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 = target->thread.kregs;
 	u32 uregs[16];
 	u32 psr;
 	int ret;

 	if (target == current)
 		flush_user_windows();

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 regs->u_regs,
 				 0, 16 * sizeof(u32));
 	if (ret || !count)
 		return ret;

 	if (regwindow32_get(target, regs, uregs))
 		return -EFAULT;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 uregs,
 				 16 * sizeof(u32), 32 * sizeof(u32));
 	if (ret)
 		return ret;
 	if (regwindow32_set(target, regs, uregs))
 		return -EFAULT;
 	if (!count)
 		return 0;

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &psr,
 				 32 * sizeof(u32), 33 * sizeof(u32));
 	if (ret)
 		return ret;
 	regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
 		    (psr & (PSR_ICC | PSR_SYSCALL));
 	if (!count)
 		return 0;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->pc,
 				 33 * sizeof(u32), 34 * sizeof(u32));
 	if (ret || !count)
 		return ret;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->npc,
 				 34 * sizeof(u32), 35 * sizeof(u32));
 	if (ret || !count)
 		return ret;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->y,
 				 35 * sizeof(u32), 36 * sizeof(u32));
 	if (ret || !count)
 		return ret;
 	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 					 36 * sizeof(u32), 38 * sizeof(u32));
 }

 static int fpregs32_get(struct task_struct *target,
 			const struct user_regset *regset,
 			struct membuf to)
 {
 #if 0
 	if (target == current)
 		save_and_clear_fpu();
 #endif

 	membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
 	membuf_zero(&to, sizeof(u32));
 	membuf_write(&to, &target->thread.fsr, sizeof(u32));
 	membuf_store(&to, (u32)((1 << 8) | (8 << 16)));
 	return membuf_zero(&to, 64 * sizeof(u32));
 }

 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 = target->thread.float_regs;
 	int ret;

 #if 0
 	if (target == current)
 		save_and_clear_fpu();
 #endif
 	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)
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 &target->thread.fsr,
 					 33 * sizeof(u32),
 					 34 * sizeof(u32));
 	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),
 		.regset_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),
 		.regset_get = fpregs32_get, .set = fpregs32_set
 	},
 };

 static int getregs_get(struct task_struct *target,
 			 const struct user_regset *regset,
 			 struct membuf to)
 {
 	const struct pt_regs *regs = target->thread.kregs;

 	if (target == current)
 		flush_user_windows();

 	membuf_store(&to, regs->psr);
 	membuf_store(&to, regs->pc);
 	membuf_store(&to, regs->npc);
 	membuf_store(&to, regs->y);
 	return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
 }

 static int setregs_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 = target->thread.kregs;
 	u32 v[4];
 	int ret;

 	if (target == current)
 		flush_user_windows();

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 v,
 				 0, 4 * sizeof(u32));
 	if (ret)
 		return ret;
 	regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
 		    (v[0] & (PSR_ICC | PSR_SYSCALL));
 	regs->pc = v[1];
 	regs->npc = v[2];
 	regs->y = v[3];
 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 regs->u_regs + 1,
 				 4 * sizeof(u32) , 19 * sizeof(u32));
 }

 static int getfpregs_get(struct task_struct *target,
 			const struct user_regset *regset,
 			struct membuf to)
 {
 #if 0
 	if (target == current)
 		save_and_clear_fpu();
 #endif
 	membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
 	membuf_write(&to, &target->thread.fsr, sizeof(u32));
 	return membuf_zero(&to, 35 * sizeof(u32));
 }

 static int setfpregs_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 = target->thread.float_regs;
 	int ret;

 #if 0
 	if (target == current)
 		save_and_clear_fpu();
 #endif
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 fpregs,
 				 0, 32 * sizeof(u32));
 	if (ret)
 		return ret;
 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &target->thread.fsr,
 				 32 * sizeof(u32),
 				 33 * sizeof(u32));
 }

 static const struct user_regset ptrace32_regsets[] = {
 	[REGSET_GENERAL] = {
 		.n = 19, .size = sizeof(u32),
 		.regset_get = getregs_get, .set = setregs_set,
 	},
 	[REGSET_FP] = {
 		.n = 68, .size = sizeof(u32),
 		.regset_get = getfpregs_get, .set = setfpregs_set,
 	},
 };

 static const struct user_regset_view ptrace32_view = {
 	.regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
 };

 static const struct user_regset_view user_sparc32_view = {
 	.name = "sparc", .e_machine = EM_SPARC,
 	.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 };

 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 {
 	return &user_sparc32_view;
 }

 struct fps {
 	unsigned long regs[32];
 	unsigned long fsr;
 	unsigned long flags;
 	unsigned long extra;
 	unsigned long fpqd;
 	struct fq {
 		unsigned long *insnaddr;
 		unsigned long insn;
 	} fpq[16];
 };

 long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
 	void __user *addr2p;
 	struct pt_regs __user *pregs;
 	struct fps __user *fps;
 	int ret;

 	addr2p = (void __user *) addr2;
 	pregs = (struct pt_regs __user *) addr;
 	fps = (struct fps __user *) addr;

 	switch(request) {
 	case PTRACE_GETREGS: {
 		ret = copy_regset_to_user(child, &ptrace32_view,
 					  REGSET_GENERAL, 0,
 					  19 * sizeof(u32),
 					  pregs);
 		break;
 	}

 	case PTRACE_SETREGS: {
 		ret = copy_regset_from_user(child, &ptrace32_view,
 					    REGSET_GENERAL, 0,
 					    19 * sizeof(u32),
 					    pregs);
 		break;
 	}

 	case PTRACE_GETFPREGS: {
 		ret = copy_regset_to_user(child, &ptrace32_view,
 					  REGSET_FP, 0,
 					  68 * sizeof(u32),
 					  fps);
 		break;
 	}

 	case PTRACE_SETFPREGS: {
 		ret = copy_regset_from_user(child, &ptrace32_view,
 					  REGSET_FP, 0,
 					  33 * sizeof(u32),
 					  fps);
 		break;
 	}

 	case PTRACE_READTEXT:
 	case PTRACE_READDATA:
 		ret = ptrace_readdata(child, addr, addr2p, data);

 		if (ret == data)
 			ret = 0;
 		else if (ret >= 0)
 			ret = -EIO;
 		break;

 	case PTRACE_WRITETEXT:
 	case PTRACE_WRITEDATA:
 		ret = ptrace_writedata(child, addr2p, 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(struct pt_regs *regs, int syscall_exit_p)
 {
 	int ret = 0;

 	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
 		if (syscall_exit_p)
 			tracehook_report_syscall_exit(regs, 0);
 		else
 			ret = tracehook_report_syscall_entry(regs);
 	}

 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0
	/* ptrace.c: Sparc process tracing support.
	*
	* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
	*
	* 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/security.h>
	#include <linux/signal.h>
	#include <linux/regset.h>
	#include <linux/elf.h>
	#include <linux/tracehook.h>

	#include <linux/uaccess.h>
	#include <asm/cacheflush.h>

	#include "kernel.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 */
	}

	enum sparc_regset {
	REGSET_GENERAL,
	REGSET_FP,
	};

	static int regwindow32_get(struct task_struct *target,
	const struct pt_regs *regs,
	u32 *uregs)
	{
	unsigned long reg_window = regs->u_regs[UREG_I6];
	int size = 16 * sizeof(u32);

	if (target == current) {
	if (copy_from_user(uregs, (void __user *)reg_window, size))
	return -EFAULT;
	} else {
	if (access_process_vm(target, reg_window, uregs, size,
	FOLL_FORCE) != size)
	return -EFAULT;
	}
	return 0;
	}

	static int regwindow32_set(struct task_struct *target,
	const struct pt_regs *regs,
	u32 *uregs)
	{
	unsigned long reg_window = regs->u_regs[UREG_I6];
	int size = 16 * sizeof(u32);

	if (target == current) {
	if (copy_to_user((void __user *)reg_window, uregs, size))
	return -EFAULT;
	} else {
	if (access_process_vm(target, reg_window, uregs, size,
	FOLL_FORCE \| FOLL_WRITE) != size)
	return -EFAULT;
	}
	return 0;
	}

	static int genregs32_get(struct task_struct *target,
	const struct user_regset *regset,
	struct membuf to)
	{
	const struct pt_regs *regs = target->thread.kregs;
	u32 uregs[16];

	if (target == current)
	flush_user_windows();

	membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
	if (!to.left)
	return 0;
	if (regwindow32_get(target, regs, uregs))
	return -EFAULT;
	membuf_write(&to, uregs, 16 * sizeof(u32));
	membuf_store(&to, regs->psr);
	membuf_store(&to, regs->pc);
	membuf_store(&to, regs->npc);
	membuf_store(&to, regs->y);
	return membuf_zero(&to, 2 * sizeof(u32));
	}

	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 = target->thread.kregs;
	u32 uregs[16];
	u32 psr;
	int ret;

	if (target == current)
	flush_user_windows();

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->u_regs,
	0, 16 * sizeof(u32));
	if (ret \|\| !count)
	return ret;

	if (regwindow32_get(target, regs, uregs))
	return -EFAULT;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	uregs,
	16 * sizeof(u32), 32 * sizeof(u32));
	if (ret)
	return ret;
	if (regwindow32_set(target, regs, uregs))
	return -EFAULT;
	if (!count)
	return 0;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&psr,
	32 * sizeof(u32), 33 * sizeof(u32));
	if (ret)
	return ret;
	regs->psr = (regs->psr & ~(PSR_ICC \| PSR_SYSCALL)) \|
	(psr & (PSR_ICC \| PSR_SYSCALL));
	if (!count)
	return 0;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->pc,
	33 * sizeof(u32), 34 * sizeof(u32));
	if (ret \|\| !count)
	return ret;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->npc,
	34 * sizeof(u32), 35 * sizeof(u32));
	if (ret \|\| !count)
	return ret;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->y,
	35 * sizeof(u32), 36 * sizeof(u32));
	if (ret \|\| !count)
	return ret;
	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	36 * sizeof(u32), 38 * sizeof(u32));
	}

	static int fpregs32_get(struct task_struct *target,
	const struct user_regset *regset,
	struct membuf to)
	{
	#if 0
	if (target == current)
	save_and_clear_fpu();
	#endif

	membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
	membuf_zero(&to, sizeof(u32));
	membuf_write(&to, &target->thread.fsr, sizeof(u32));
	membuf_store(&to, (u32)((1 << 8) \| (8 << 16)));
	return membuf_zero(&to, 64 * sizeof(u32));
	}

	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 = target->thread.float_regs;
	int ret;

	#if 0
	if (target == current)
	save_and_clear_fpu();
	#endif
	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)
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&target->thread.fsr,
	33 * sizeof(u32),
	34 * sizeof(u32));
	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),
	.regset_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),
	.regset_get = fpregs32_get, .set = fpregs32_set
	},
	};

	static int getregs_get(struct task_struct *target,
	const struct user_regset *regset,
	struct membuf to)
	{
	const struct pt_regs *regs = target->thread.kregs;

	if (target == current)
	flush_user_windows();

	membuf_store(&to, regs->psr);
	membuf_store(&to, regs->pc);
	membuf_store(&to, regs->npc);
	membuf_store(&to, regs->y);
	return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
	}

	static int setregs_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 = target->thread.kregs;
	u32 v[4];
	int ret;

	if (target == current)
	flush_user_windows();

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	v,
	0, 4 * sizeof(u32));
	if (ret)
	return ret;
	regs->psr = (regs->psr & ~(PSR_ICC \| PSR_SYSCALL)) \|
	(v[0] & (PSR_ICC \| PSR_SYSCALL));
	regs->pc = v[1];
	regs->npc = v[2];
	regs->y = v[3];
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->u_regs + 1,
	4 * sizeof(u32) , 19 * sizeof(u32));
	}

	static int getfpregs_get(struct task_struct *target,
	const struct user_regset *regset,
	struct membuf to)
	{
	#if 0
	if (target == current)
	save_and_clear_fpu();
	#endif
	membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
	membuf_write(&to, &target->thread.fsr, sizeof(u32));
	return membuf_zero(&to, 35 * sizeof(u32));
	}

	static int setfpregs_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 = target->thread.float_regs;
	int ret;

	#if 0
	if (target == current)
	save_and_clear_fpu();
	#endif
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	fpregs,
	0, 32 * sizeof(u32));
	if (ret)
	return ret;
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&target->thread.fsr,
	32 * sizeof(u32),
	33 * sizeof(u32));
	}

	static const struct user_regset ptrace32_regsets[] = {
	[REGSET_GENERAL] = {
	.n = 19, .size = sizeof(u32),
	.regset_get = getregs_get, .set = setregs_set,
	},
	[REGSET_FP] = {
	.n = 68, .size = sizeof(u32),
	.regset_get = getfpregs_get, .set = setfpregs_set,
	},
	};

	static const struct user_regset_view ptrace32_view = {
	.regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
	};

	static const struct user_regset_view user_sparc32_view = {
	.name = "sparc", .e_machine = EM_SPARC,
	.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
	};

	const struct user_regset_view task_user_regset_view(struct task_struct task)
	{
	return &user_sparc32_view;
	}

	struct fps {
	unsigned long regs[32];
	unsigned long fsr;
	unsigned long flags;
	unsigned long extra;
	unsigned long fpqd;
	struct fq {
	unsigned long *insnaddr;
	unsigned long insn;
	} fpq[16];
	};

	long arch_ptrace(struct task_struct *child, long request,
	unsigned long addr, unsigned long data)
	{
	unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
	void __user *addr2p;
	struct pt_regs __user *pregs;
	struct fps __user *fps;
	int ret;

	addr2p = (void __user *) addr2;
	pregs = (struct pt_regs __user *) addr;
	fps = (struct fps __user *) addr;

	switch(request) {
	case PTRACE_GETREGS: {
	ret = copy_regset_to_user(child, &ptrace32_view,
	REGSET_GENERAL, 0,
	19 * sizeof(u32),
	pregs);
	break;
	}

	case PTRACE_SETREGS: {
	ret = copy_regset_from_user(child, &ptrace32_view,
	REGSET_GENERAL, 0,
	19 * sizeof(u32),
	pregs);
	break;
	}

	case PTRACE_GETFPREGS: {
	ret = copy_regset_to_user(child, &ptrace32_view,
	REGSET_FP, 0,
	68 * sizeof(u32),
	fps);
	break;
	}

	case PTRACE_SETFPREGS: {
	ret = copy_regset_from_user(child, &ptrace32_view,
	REGSET_FP, 0,
	33 * sizeof(u32),
	fps);
	break;
	}

	case PTRACE_READTEXT:
	case PTRACE_READDATA:
	ret = ptrace_readdata(child, addr, addr2p, data);

	if (ret == data)
	ret = 0;
	else if (ret >= 0)
	ret = -EIO;
	break;

	case PTRACE_WRITETEXT:
	case PTRACE_WRITEDATA:
	ret = ptrace_writedata(child, addr2p, 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(struct pt_regs *regs, int syscall_exit_p)
	{
	int ret = 0;

	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
	if (syscall_exit_p)
	tracehook_report_syscall_exit(regs, 0);
	else
	ret = tracehook_report_syscall_entry(regs);
	}

	return ret;
	}