arch/sparc/kernel/ptrace.c - arm/linux - Git at Google

 /* 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/smp_lock.h>
 #include <linux/security.h>
 #include <linux/signal.h>
 #include <linux/regset.h>
 #include <linux/elf.h>

 #include <asm/pgtable.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>

 #define MAGIC_CONSTANT 0x80000000


 /* Returning from ptrace is a bit tricky because the syscall return
  * low level code assumes any value returned which is negative and
  * is a valid errno will mean setting the condition codes to indicate
  * an error return.  This doesn't work, so we have this hook.
  */
 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
 {
 	regs->u_regs[UREG_I0] = error;
 	regs->psr |= PSR_C;
 	regs->pc = regs->npc;
 	regs->npc += 4;
 }

 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
 {
 	regs->u_regs[UREG_I0] = value;
 	regs->psr &= ~PSR_C;
 	regs->pc = regs->npc;
 	regs->npc += 4;
 }

 static void
 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
 {
 	if (put_user(value, addr)) {
 		pt_error_return(regs, EFAULT);
 		return;
 	}
 	regs->u_regs[UREG_I0] = 0;
 	regs->psr &= ~PSR_C;
 	regs->pc = regs->npc;
 	regs->npc += 4;
 }

 static void
 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
 {
 	if (current->personality == PER_SUNOS)
 		pt_succ_return (regs, val);
 	else
 		pt_succ_return_linux (regs, val, addr);
 }

 /* Fuck me gently with a chainsaw... */
 static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
 				   struct task_struct *tsk, long __user *addr)
 {
 	struct pt_regs *cregs = tsk->thread.kregs;
 	struct thread_info *t = task_thread_info(tsk);
 	int v;

 	if(offset >= 1024)
 		offset -= 1024; /* whee... */
 	if(offset & ((sizeof(unsigned long) - 1))) {
 		pt_error_return(regs, EIO);
 		return;
 	}
 	if(offset >= 16 && offset < 784) {
 		offset -= 16; offset >>= 2;
 		pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
 		return;
 	}
 	if(offset >= 784 && offset < 832) {
 		offset -= 784; offset >>= 2;
 		pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
 		return;
 	}
 	switch(offset) {
 	case 0:
 		v = t->ksp;
 		break;
 	case 4:
 		v = t->kpc;
 		break;
 	case 8:
 		v = t->kpsr;
 		break;
 	case 12:
 		v = t->uwinmask;
 		break;
 	case 832:
 		v = t->w_saved;
 		break;
 	case 896:
 		v = cregs->u_regs[UREG_I0];
 		break;
 	case 900:
 		v = cregs->u_regs[UREG_I1];
 		break;
 	case 904:
 		v = cregs->u_regs[UREG_I2];
 		break;
 	case 908:
 		v = cregs->u_regs[UREG_I3];
 		break;
 	case 912:
 		v = cregs->u_regs[UREG_I4];
 		break;
 	case 916:
 		v = cregs->u_regs[UREG_I5];
 		break;
 	case 920:
 		v = cregs->u_regs[UREG_I6];
 		break;
 	case 924:
 		if(tsk->thread.flags & MAGIC_CONSTANT)
 			v = cregs->u_regs[UREG_G1];
 		else
 			v = 0;
 		break;
 	case 940:
 		v = cregs->u_regs[UREG_I0];
 		break;
 	case 944:
 		v = cregs->u_regs[UREG_I1];
 		break;

 	case 948:
 		/* Isn't binary compatibility _fun_??? */
 		if(cregs->psr & PSR_C)
 			v = cregs->u_regs[UREG_I0] << 24;
 		else
 			v = 0;
 		break;

 		/* Rest of them are completely unsupported. */
 	default:
 		printk("%s [%d]: Wants to read user offset %ld\n",
 		       current->comm, task_pid_nr(current), offset);
 		pt_error_return(regs, EIO);
 		return;
 	}
 	if (current->personality == PER_SUNOS)
 		pt_succ_return (regs, v);
 	else
 		pt_succ_return_linux (regs, v, addr);
 	return;
 }

 static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
 				    struct task_struct *tsk)
 {
 	struct pt_regs *cregs = tsk->thread.kregs;
 	struct thread_info *t = task_thread_info(tsk);
 	unsigned long value = regs->u_regs[UREG_I3];

 	if(offset >= 1024)
 		offset -= 1024; /* whee... */
 	if(offset & ((sizeof(unsigned long) - 1)))
 		goto failure;
 	if(offset >= 16 && offset < 784) {
 		offset -= 16; offset >>= 2;
 		*(((unsigned long *)(&t->reg_window[0]))+offset) = value;
 		goto success;
 	}
 	if(offset >= 784 && offset < 832) {
 		offset -= 784; offset >>= 2;
 		*(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
 		goto success;
 	}
 	switch(offset) {
 	case 896:
 		cregs->u_regs[UREG_I0] = value;
 		break;
 	case 900:
 		cregs->u_regs[UREG_I1] = value;
 		break;
 	case 904:
 		cregs->u_regs[UREG_I2] = value;
 		break;
 	case 908:
 		cregs->u_regs[UREG_I3] = value;
 		break;
 	case 912:
 		cregs->u_regs[UREG_I4] = value;
 		break;
 	case 916:
 		cregs->u_regs[UREG_I5] = value;
 		break;
 	case 920:
 		cregs->u_regs[UREG_I6] = value;
 		break;
 	case 924:
 		cregs->u_regs[UREG_I7] = value;
 		break;
 	case 940:
 		cregs->u_regs[UREG_I0] = value;
 		break;
 	case 944:
 		cregs->u_regs[UREG_I1] = value;
 		break;

 		/* Rest of them are completely unsupported or "no-touch". */
 	default:
 		printk("%s [%d]: Wants to write user offset %ld\n",
 		       current->comm, task_pid_nr(current), offset);
 		goto failure;
 	}
 success:
 	pt_succ_return(regs, 0);
 	return;
 failure:
 	pt_error_return(regs, EIO);
 	return;
 }

 /* #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 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 = target->thread.kregs;
 	unsigned long __user *reg_window;
 	unsigned long *k = kbuf;
 	unsigned long __user *u = ubuf;
 	unsigned long reg;

 	if (target == current)
 		flush_user_windows();

 	pos /= sizeof(reg);
 	count /= sizeof(reg);

 	if (kbuf) {
 		for (; count > 0 && pos < 16; count--)
 			*k++ = regs->u_regs[pos++];

 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(*k++, &reg_window[pos++]))
 				return -EFAULT;
 		}
 	} else {
 		for (; count > 0 && pos < 16; count--) {
 			if (put_user(regs->u_regs[pos++], u++))
 				return -EFAULT;
 		}

 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(reg, &reg_window[pos++]) ||
 			    put_user(reg, u++))
 				return -EFAULT;
 		}
 	}
 	while (count > 0) {
 		switch (pos) {
 		case 32: /* PSR */
 			reg = regs->psr;
 			break;
 		case 33: /* PC */
 			reg = regs->pc;
 			break;
 		case 34: /* NPC */
 			reg = regs->npc;
 			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 = target->thread.kregs;
 	unsigned long __user *reg_window;
 	const unsigned long *k = kbuf;
 	const unsigned long __user *u = ubuf;
 	unsigned long reg;

 	if (target == current)
 		flush_user_windows();

 	pos /= sizeof(reg);
 	count /= sizeof(reg);

 	if (kbuf) {
 		for (; count > 0 && pos < 16; count--)
 			regs->u_regs[pos++] = *k++;

 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 		for (; count > 0 && pos < 32; count--) {
 			if (put_user(*k++, &reg_window[pos++]))
 				return -EFAULT;
 		}
 	} else {
 		for (; count > 0 && pos < 16; count--) {
 			if (get_user(reg, u++))
 				return -EFAULT;
 			regs->u_regs[pos++] = reg;
 		}

 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(reg, u++) ||
 			    put_user(reg, &reg_window[pos++]))
 				return -EFAULT;
 		}
 	}
 	while (count > 0) {
 		unsigned long psr;

 		if (kbuf)
 			reg = *k++;
 		else if (get_user(reg, u++))
 			return -EFAULT;

 		switch (pos) {
 		case 32: /* PSR */
 			psr = regs->psr;
 			psr &= ~PSR_ICC;
 			psr |= (reg & PSR_ICC);
 			regs->psr = psr;
 			break;
 		case 33: /* PC */
 			regs->pc = reg;
 			break;
 		case 34: /* NPC */
 			regs->npc = 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 = target->thread.float_regs;
 	int ret = 0;

 #if 0
 	if (target == current)
 		save_and_clear_fpu();
 #endif

 	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,
 					  &target->thread.fsr,
 					  33 * sizeof(u32),
 					  34 * sizeof(u32));

 	if (!ret) {
 		unsigned long val;

 		val = (1 << 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 = 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 && count > 0) {
 		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 * sizeof(u32),
 		.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 * sizeof(u32),
 		.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)
 };

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

 asmlinkage void do_ptrace(struct pt_regs *regs)
 {
 	unsigned long request = regs->u_regs[UREG_I0];
 	unsigned long pid = regs->u_regs[UREG_I1];
 	unsigned long addr = regs->u_regs[UREG_I2];
 	unsigned long data = regs->u_regs[UREG_I3];
 	unsigned long addr2 = regs->u_regs[UREG_I4];
 	struct task_struct *child;
 	int ret;

 	lock_kernel();

 	if (request == PTRACE_TRACEME) {
 		ret = ptrace_traceme();
 		if (ret < 0)
 			pt_error_return(regs, -ret);
 		else
 			pt_succ_return(regs, 0);
 		goto out;
 	}

 	child = ptrace_get_task_struct(pid);
 	if (IS_ERR(child)) {
 		ret = PTR_ERR(child);
 		pt_error_return(regs, -ret);
 		goto out;
 	}

 	if (request == PTRACE_ATTACH) {
 		if (ptrace_attach(child)) {
 			pt_error_return(regs, EPERM);
 			goto out_tsk;
 		}
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	ret = ptrace_check_attach(child, request == PTRACE_KILL);
 	if (ret < 0) {
 		pt_error_return(regs, -ret);
 		goto out_tsk;
 	}

 	switch(request) {
 	case PTRACE_PEEKTEXT: /* read word at location addr. */
 	case PTRACE_PEEKDATA: {
 		unsigned long tmp;

 		if (access_process_vm(child, addr,
 				      &tmp, sizeof(tmp), 0) == sizeof(tmp))
 			pt_os_succ_return(regs, tmp, (long __user *)data);
 		else
 			pt_error_return(regs, EIO);
 		goto out_tsk;
 	}

 	case PTRACE_PEEKUSR:
 		read_sunos_user(regs, addr, child, (long __user *) data);
 		goto out_tsk;

 	case PTRACE_POKEUSR:
 		write_sunos_user(regs, addr, child);
 		goto out_tsk;

 	case PTRACE_POKETEXT: /* write the word at location addr. */
 	case PTRACE_POKEDATA: {
 		if (access_process_vm(child, addr,
 				      &data, sizeof(data), 1) == sizeof(data))
 			pt_succ_return(regs, 0);
 		else
 			pt_error_return(regs, EIO);
 		goto out_tsk;
 	}

 	case PTRACE_GETREGS: {
 		struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 		struct pt_regs *cregs = child->thread.kregs;
 		int rval;

 		if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
 			rval = -EFAULT;
 			pt_error_return(regs, -rval);
 			goto out_tsk;
 		}
 		__put_user(cregs->psr, (&pregs->psr));
 		__put_user(cregs->pc, (&pregs->pc));
 		__put_user(cregs->npc, (&pregs->npc));
 		__put_user(cregs->y, (&pregs->y));
 		for(rval = 1; rval < 16; rval++)
 			__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	case PTRACE_SETREGS: {
 		struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 		struct pt_regs *cregs = child->thread.kregs;
 		unsigned long psr, pc, npc, y;
 		int i;

 		/* Must be careful, tracing process can only set certain
 		 * bits in the psr.
 		 */
 		if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
 			pt_error_return(regs, EFAULT);
 			goto out_tsk;
 		}
 		__get_user(psr, (&pregs->psr));
 		__get_user(pc, (&pregs->pc));
 		__get_user(npc, (&pregs->npc));
 		__get_user(y, (&pregs->y));
 		psr &= PSR_ICC;
 		cregs->psr &= ~PSR_ICC;
 		cregs->psr |= psr;
 		if (!((pc | npc) & 3)) {
 			cregs->pc = pc;
 			cregs->npc =npc;
 		}
 		cregs->y = y;
 		for(i = 1; i < 16; i++)
 			__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	case PTRACE_GETFPREGS: {
 		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];
 		};
 		struct fps __user *fps = (struct fps __user *) addr;
 		int i;

 		if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
 			i = -EFAULT;
 			pt_error_return(regs, -i);
 			goto out_tsk;
 		}
 		for(i = 0; i < 32; i++)
 			__put_user(child->thread.float_regs[i], (&fps->regs[i]));
 		__put_user(child->thread.fsr, (&fps->fsr));
 		__put_user(child->thread.fpqdepth, (&fps->fpqd));
 		__put_user(0, (&fps->flags));
 		__put_user(0, (&fps->extra));
 		for(i = 0; i < 16; i++) {
 			__put_user(child->thread.fpqueue[i].insn_addr,
 				   (&fps->fpq[i].insnaddr));
 			__put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
 		}
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	case PTRACE_SETFPREGS: {
 		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];
 		};
 		struct fps __user *fps = (struct fps __user *) addr;
 		int i;

 		if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
 			i = -EFAULT;
 			pt_error_return(regs, -i);
 			goto out_tsk;
 		}
 		copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
 		__get_user(child->thread.fsr, (&fps->fsr));
 		__get_user(child->thread.fpqdepth, (&fps->fpqd));
 		for(i = 0; i < 16; i++) {
 			__get_user(child->thread.fpqueue[i].insn_addr,
 				   (&fps->fpq[i].insnaddr));
 			__get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
 		}
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	case PTRACE_READTEXT:
 	case PTRACE_READDATA: {
 		int res = ptrace_readdata(child, addr,
 					  (void __user *) addr2, data);

 		if (res == data) {
 			pt_succ_return(regs, 0);
 			goto out_tsk;
 		}
 		/* Partial read is an IO failure */
 		if (res >= 0)
 			res = -EIO;
 		pt_error_return(regs, -res);
 		goto out_tsk;
 	}

 	case PTRACE_WRITETEXT:
 	case PTRACE_WRITEDATA: {
 		int res = ptrace_writedata(child, (void __user *) addr2,
 					   addr, data);

 		if (res == data) {
 			pt_succ_return(regs, 0);
 			goto out_tsk;
 		}
 		/* Partial write is an IO failure */
 		if (res >= 0)
 			res = -EIO;
 		pt_error_return(regs, -res);
 		goto out_tsk;
 	}

 	case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 		addr = 1;

 	case PTRACE_CONT: { /* restart after signal. */
 		if (!valid_signal(data)) {
 			pt_error_return(regs, EIO);
 			goto out_tsk;
 		}

 		if (request == PTRACE_SYSCALL)
 			set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 		else
 			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

 		child->exit_code = data;
 		wake_up_process(child);
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 /*
  * make the child exit.  Best I can do is send it a sigkill.
  * perhaps it should be put in the status that it wants to
  * exit.
  */
 	case PTRACE_KILL: {
 		if (child->exit_state == EXIT_ZOMBIE) {	/* already dead */
 			pt_succ_return(regs, 0);
 			goto out_tsk;
 		}
 		wake_up_process(child);
 		child->exit_code = SIGKILL;
 		pt_succ_return(regs, 0);
 		goto out_tsk;
 	}

 	default: {
 		int err = ptrace_request(child, request, addr, data);
 		if (err)
 			pt_error_return(regs, -err);
 		else
 			pt_succ_return(regs, 0);
 		goto out_tsk;
 	}
 	}
 out_tsk:
 	if (child)
 		put_task_struct(child);
 out:
 	unlock_kernel();
 }

 asmlinkage void syscall_trace(void)
 {
 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
 		return;
 	if (!(current->ptrace & PT_PTRACED))
 		return;
 	current->thread.flags ^= MAGIC_CONSTANT;
 	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 				 ? 0x80 : 0));
 	/*
 	 * this isn't the same as continuing with a signal, but it will do
 	 * for normal use.  strace only continues with a signal if the
 	 * stopping signal is not SIGTRAP.  -brl
 	 */
 	if (current->exit_code) {
 		send_sig (current->exit_code, current, 1);
 		current->exit_code = 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/smp_lock.h>
	#include <linux/security.h>
	#include <linux/signal.h>
	#include <linux/regset.h>
	#include <linux/elf.h>

	#include <asm/pgtable.h>
	#include <asm/system.h>
	#include <asm/uaccess.h>

	#define MAGIC_CONSTANT 0x80000000


	/* Returning from ptrace is a bit tricky because the syscall return
	* low level code assumes any value returned which is negative and
	* is a valid errno will mean setting the condition codes to indicate
	* an error return. This doesn't work, so we have this hook.
	*/
	static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
	{
	regs->u_regs[UREG_I0] = error;
	regs->psr \|= PSR_C;
	regs->pc = regs->npc;
	regs->npc += 4;
	}

	static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
	{
	regs->u_regs[UREG_I0] = value;
	regs->psr &= ~PSR_C;
	regs->pc = regs->npc;
	regs->npc += 4;
	}

	static void
	pt_succ_return_linux(struct pt_regs regs, unsigned long value, long __user addr)
	{
	if (put_user(value, addr)) {
	pt_error_return(regs, EFAULT);
	return;
	}
	regs->u_regs[UREG_I0] = 0;
	regs->psr &= ~PSR_C;
	regs->pc = regs->npc;
	regs->npc += 4;
	}

	static void
	pt_os_succ_return (struct pt_regs regs, unsigned long val, long __user addr)
	{
	if (current->personality == PER_SUNOS)
	pt_succ_return (regs, val);
	else
	pt_succ_return_linux (regs, val, addr);
	}

	/* Fuck me gently with a chainsaw... */
	static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
	struct task_struct tsk, long __user addr)
	{
	struct pt_regs *cregs = tsk->thread.kregs;
	struct thread_info *t = task_thread_info(tsk);
	int v;

	if(offset >= 1024)
	offset -= 1024; /* whee... */
	if(offset & ((sizeof(unsigned long) - 1))) {
	pt_error_return(regs, EIO);
	return;
	}
	if(offset >= 16 && offset < 784) {
	offset -= 16; offset >>= 2;
	pt_os_succ_return(regs, (((unsigned long )(&t->reg_window[0]))+offset), addr);
	return;
	}
	if(offset >= 784 && offset < 832) {
	offset -= 784; offset >>= 2;
	pt_os_succ_return(regs, (((unsigned long )(&t->rwbuf_stkptrs[0]))+offset), addr);
	return;
	}
	switch(offset) {
	case 0:
	v = t->ksp;
	break;
	case 4:
	v = t->kpc;
	break;
	case 8:
	v = t->kpsr;
	break;
	case 12:
	v = t->uwinmask;
	break;
	case 832:
	v = t->w_saved;
	break;
	case 896:
	v = cregs->u_regs[UREG_I0];
	break;
	case 900:
	v = cregs->u_regs[UREG_I1];
	break;
	case 904:
	v = cregs->u_regs[UREG_I2];
	break;
	case 908:
	v = cregs->u_regs[UREG_I3];
	break;
	case 912:
	v = cregs->u_regs[UREG_I4];
	break;
	case 916:
	v = cregs->u_regs[UREG_I5];
	break;
	case 920:
	v = cregs->u_regs[UREG_I6];
	break;
	case 924:
	if(tsk->thread.flags & MAGIC_CONSTANT)
	v = cregs->u_regs[UREG_G1];
	else
	v = 0;
	break;
	case 940:
	v = cregs->u_regs[UREG_I0];
	break;
	case 944:
	v = cregs->u_regs[UREG_I1];
	break;

	case 948:
	/* Isn't binary compatibility _fun_??? */
	if(cregs->psr & PSR_C)
	v = cregs->u_regs[UREG_I0] << 24;
	else
	v = 0;
	break;

	/* Rest of them are completely unsupported. */
	default:
	printk("%s [%d]: Wants to read user offset %ld\n",
	current->comm, task_pid_nr(current), offset);
	pt_error_return(regs, EIO);
	return;
	}
	if (current->personality == PER_SUNOS)
	pt_succ_return (regs, v);
	else
	pt_succ_return_linux (regs, v, addr);
	return;
	}

	static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
	struct task_struct *tsk)
	{
	struct pt_regs *cregs = tsk->thread.kregs;
	struct thread_info *t = task_thread_info(tsk);
	unsigned long value = regs->u_regs[UREG_I3];

	if(offset >= 1024)
	offset -= 1024; /* whee... */
	if(offset & ((sizeof(unsigned long) - 1)))
	goto failure;
	if(offset >= 16 && offset < 784) {
	offset -= 16; offset >>= 2;
	(((unsigned long )(&t->reg_window[0]))+offset) = value;
	goto success;
	}
	if(offset >= 784 && offset < 832) {
	offset -= 784; offset >>= 2;
	(((unsigned long )(&t->rwbuf_stkptrs[0]))+offset) = value;
	goto success;
	}
	switch(offset) {
	case 896:
	cregs->u_regs[UREG_I0] = value;
	break;
	case 900:
	cregs->u_regs[UREG_I1] = value;
	break;
	case 904:
	cregs->u_regs[UREG_I2] = value;
	break;
	case 908:
	cregs->u_regs[UREG_I3] = value;
	break;
	case 912:
	cregs->u_regs[UREG_I4] = value;
	break;
	case 916:
	cregs->u_regs[UREG_I5] = value;
	break;
	case 920:
	cregs->u_regs[UREG_I6] = value;
	break;
	case 924:
	cregs->u_regs[UREG_I7] = value;
	break;
	case 940:
	cregs->u_regs[UREG_I0] = value;
	break;
	case 944:
	cregs->u_regs[UREG_I1] = value;
	break;

	/* Rest of them are completely unsupported or "no-touch". */
	default:
	printk("%s [%d]: Wants to write user offset %ld\n",
	current->comm, task_pid_nr(current), offset);
	goto failure;
	}
	success:
	pt_succ_return(regs, 0);
	return;
	failure:
	pt_error_return(regs, EIO);
	return;
	}

	/* #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 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 = target->thread.kregs;
	unsigned long __user *reg_window;
	unsigned long *k = kbuf;
	unsigned long __user *u = ubuf;
	unsigned long reg;

	if (target == current)
	flush_user_windows();

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf) {
	for (; count > 0 && pos < 16; count--)
	*k++ = regs->u_regs[pos++];

	reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
	for (; count > 0 && pos < 32; count--) {
	if (get_user(*k++, &reg_window[pos++]))
	return -EFAULT;
	}
	} else {
	for (; count > 0 && pos < 16; count--) {
	if (put_user(regs->u_regs[pos++], u++))
	return -EFAULT;
	}

	reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
	for (; count > 0 && pos < 32; count--) {
	if (get_user(reg, &reg_window[pos++]) \|\|
	put_user(reg, u++))
	return -EFAULT;
	}
	}
	while (count > 0) {
	switch (pos) {
	case 32: /* PSR */
	reg = regs->psr;
	break;
	case 33: /* PC */
	reg = regs->pc;
	break;
	case 34: /* NPC */
	reg = regs->npc;
	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 = target->thread.kregs;
	unsigned long __user *reg_window;
	const unsigned long *k = kbuf;
	const unsigned long __user *u = ubuf;
	unsigned long reg;

	if (target == current)
	flush_user_windows();

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf) {
	for (; count > 0 && pos < 16; count--)
	regs->u_regs[pos++] = *k++;

	reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
	for (; count > 0 && pos < 32; count--) {
	if (put_user(*k++, &reg_window[pos++]))
	return -EFAULT;
	}
	} else {
	for (; count > 0 && pos < 16; count--) {
	if (get_user(reg, u++))
	return -EFAULT;
	regs->u_regs[pos++] = reg;
	}

	reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
	for (; count > 0 && pos < 32; count--) {
	if (get_user(reg, u++) \|\|
	put_user(reg, &reg_window[pos++]))
	return -EFAULT;
	}
	}
	while (count > 0) {
	unsigned long psr;

	if (kbuf)
	reg = *k++;
	else if (get_user(reg, u++))
	return -EFAULT;

	switch (pos) {
	case 32: /* PSR */
	psr = regs->psr;
	psr &= ~PSR_ICC;
	psr \|= (reg & PSR_ICC);
	regs->psr = psr;
	break;
	case 33: /* PC */
	regs->pc = reg;
	break;
	case 34: /* NPC */
	regs->npc = 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 = target->thread.float_regs;
	int ret = 0;

	#if 0
	if (target == current)
	save_and_clear_fpu();
	#endif

	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,
	&target->thread.fsr,
	33 * sizeof(u32),
	34 * sizeof(u32));

	if (!ret) {
	unsigned long val;

	val = (1 << 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 = 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 && count > 0) {
	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 * sizeof(u32),
	.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 * sizeof(u32),
	.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)
	};

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

	asmlinkage void do_ptrace(struct pt_regs *regs)
	{
	unsigned long request = regs->u_regs[UREG_I0];
	unsigned long pid = regs->u_regs[UREG_I1];
	unsigned long addr = regs->u_regs[UREG_I2];
	unsigned long data = regs->u_regs[UREG_I3];
	unsigned long addr2 = regs->u_regs[UREG_I4];
	struct task_struct *child;
	int ret;

	lock_kernel();

	if (request == PTRACE_TRACEME) {
	ret = ptrace_traceme();
	if (ret < 0)
	pt_error_return(regs, -ret);
	else
	pt_succ_return(regs, 0);
	goto out;
	}

	child = ptrace_get_task_struct(pid);
	if (IS_ERR(child)) {
	ret = PTR_ERR(child);
	pt_error_return(regs, -ret);
	goto out;
	}

	if (request == PTRACE_ATTACH) {
	if (ptrace_attach(child)) {
	pt_error_return(regs, EPERM);
	goto out_tsk;
	}
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	ret = ptrace_check_attach(child, request == PTRACE_KILL);
	if (ret < 0) {
	pt_error_return(regs, -ret);
	goto out_tsk;
	}

	switch(request) {
	case PTRACE_PEEKTEXT: /* read word at location addr. */
	case PTRACE_PEEKDATA: {
	unsigned long tmp;

	if (access_process_vm(child, addr,
	&tmp, sizeof(tmp), 0) == sizeof(tmp))
	pt_os_succ_return(regs, tmp, (long __user *)data);
	else
	pt_error_return(regs, EIO);
	goto out_tsk;
	}

	case PTRACE_PEEKUSR:
	read_sunos_user(regs, addr, child, (long __user *) data);
	goto out_tsk;

	case PTRACE_POKEUSR:
	write_sunos_user(regs, addr, child);
	goto out_tsk;

	case PTRACE_POKETEXT: /* write the word at location addr. */
	case PTRACE_POKEDATA: {
	if (access_process_vm(child, addr,
	&data, sizeof(data), 1) == sizeof(data))
	pt_succ_return(regs, 0);
	else
	pt_error_return(regs, EIO);
	goto out_tsk;
	}

	case PTRACE_GETREGS: {
	struct pt_regs __user pregs = (struct pt_regs __user ) addr;
	struct pt_regs *cregs = child->thread.kregs;
	int rval;

	if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
	rval = -EFAULT;
	pt_error_return(regs, -rval);
	goto out_tsk;
	}
	__put_user(cregs->psr, (&pregs->psr));
	__put_user(cregs->pc, (&pregs->pc));
	__put_user(cregs->npc, (&pregs->npc));
	__put_user(cregs->y, (&pregs->y));
	for(rval = 1; rval < 16; rval++)
	__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	case PTRACE_SETREGS: {
	struct pt_regs __user pregs = (struct pt_regs __user ) addr;
	struct pt_regs *cregs = child->thread.kregs;
	unsigned long psr, pc, npc, y;
	int i;

	/* Must be careful, tracing process can only set certain
	* bits in the psr.
	*/
	if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
	pt_error_return(regs, EFAULT);
	goto out_tsk;
	}
	__get_user(psr, (&pregs->psr));
	__get_user(pc, (&pregs->pc));
	__get_user(npc, (&pregs->npc));
	__get_user(y, (&pregs->y));
	psr &= PSR_ICC;
	cregs->psr &= ~PSR_ICC;
	cregs->psr \|= psr;
	if (!((pc \| npc) & 3)) {
	cregs->pc = pc;
	cregs->npc =npc;
	}
	cregs->y = y;
	for(i = 1; i < 16; i++)
	__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	case PTRACE_GETFPREGS: {
	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];
	};
	struct fps __user fps = (struct fps __user ) addr;
	int i;

	if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
	i = -EFAULT;
	pt_error_return(regs, -i);
	goto out_tsk;
	}
	for(i = 0; i < 32; i++)
	__put_user(child->thread.float_regs[i], (&fps->regs[i]));
	__put_user(child->thread.fsr, (&fps->fsr));
	__put_user(child->thread.fpqdepth, (&fps->fpqd));
	__put_user(0, (&fps->flags));
	__put_user(0, (&fps->extra));
	for(i = 0; i < 16; i++) {
	__put_user(child->thread.fpqueue[i].insn_addr,
	(&fps->fpq[i].insnaddr));
	__put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
	}
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	case PTRACE_SETFPREGS: {
	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];
	};
	struct fps __user fps = (struct fps __user ) addr;
	int i;

	if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
	i = -EFAULT;
	pt_error_return(regs, -i);
	goto out_tsk;
	}
	copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
	__get_user(child->thread.fsr, (&fps->fsr));
	__get_user(child->thread.fpqdepth, (&fps->fpqd));
	for(i = 0; i < 16; i++) {
	__get_user(child->thread.fpqueue[i].insn_addr,
	(&fps->fpq[i].insnaddr));
	__get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
	}
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	case PTRACE_READTEXT:
	case PTRACE_READDATA: {
	int res = ptrace_readdata(child, addr,
	(void __user *) addr2, data);

	if (res == data) {
	pt_succ_return(regs, 0);
	goto out_tsk;
	}
	/* Partial read is an IO failure */
	if (res >= 0)
	res = -EIO;
	pt_error_return(regs, -res);
	goto out_tsk;
	}

	case PTRACE_WRITETEXT:
	case PTRACE_WRITEDATA: {
	int res = ptrace_writedata(child, (void __user *) addr2,
	addr, data);

	if (res == data) {
	pt_succ_return(regs, 0);
	goto out_tsk;
	}
	/* Partial write is an IO failure */
	if (res >= 0)
	res = -EIO;
	pt_error_return(regs, -res);
	goto out_tsk;
	}

	case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
	addr = 1;

	case PTRACE_CONT: { /* restart after signal. */
	if (!valid_signal(data)) {
	pt_error_return(regs, EIO);
	goto out_tsk;
	}

	if (request == PTRACE_SYSCALL)
	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	else
	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);

	child->exit_code = data;
	wake_up_process(child);
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	/*
	* make the child exit. Best I can do is send it a sigkill.
	* perhaps it should be put in the status that it wants to
	* exit.
	*/
	case PTRACE_KILL: {
	if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
	pt_succ_return(regs, 0);
	goto out_tsk;
	}
	wake_up_process(child);
	child->exit_code = SIGKILL;
	pt_succ_return(regs, 0);
	goto out_tsk;
	}

	default: {
	int err = ptrace_request(child, request, addr, data);
	if (err)
	pt_error_return(regs, -err);
	else
	pt_succ_return(regs, 0);
	goto out_tsk;
	}
	}
	out_tsk:
	if (child)
	put_task_struct(child);
	out:
	unlock_kernel();
	}

	asmlinkage void syscall_trace(void)
	{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	return;
	if (!(current->ptrace & PT_PTRACED))
	return;
	current->thread.flags ^= MAGIC_CONSTANT;
	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD)
	? 0x80 : 0));
	/*
	* this isn't the same as continuing with a signal, but it will do
	* for normal use. strace only continues with a signal if the
	* stopping signal is not SIGTRAP. -brl
	*/
	if (current->exit_code) {
	send_sig (current->exit_code, current, 1);
	current->exit_code = 0;
	}
	}