arch/score/kernel/ptrace.c - maze/linux - Git at Google

 /*
  * arch/score/kernel/ptrace.c
  *
  * Score Processor version.
  *
  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
  *  Chen Liqin <liqin.chen@sunplusct.com>
  *  Lennox Wu <lennox.wu@sunplusct.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/elf.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/ptrace.h>
 #include <linux/regset.h>

 #include <asm/uaccess.h>

 /*
  * retrieve the contents of SCORE userspace general registers
  */
 static int genregs_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;

 	/* skip 9 * sizeof(unsigned long) not use for pt_regs */
 	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 					0, offsetof(struct pt_regs, regs));

 	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  regs->regs,
 				  offsetof(struct pt_regs, regs),
 				  offsetof(struct pt_regs, cp0_condition));

 	if (!ret)
 		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 						sizeof(struct pt_regs), -1);

 	return ret;
 }

 /*
  * update the contents of the SCORE userspace general registers
  */
 static int genregs_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;

 	/* skip 9 * sizeof(unsigned long) */
 	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 					0, offsetof(struct pt_regs, regs));

 	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				  regs->regs,
 				  offsetof(struct pt_regs, regs),
 				  offsetof(struct pt_regs, cp0_condition));

 	if (!ret)
 		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 						sizeof(struct pt_regs), -1);

 	return ret;
 }

 /*
  * Define the register sets available on the score7 under Linux
  */
 enum score7_regset {
 	REGSET_GENERAL,
 };

 static const struct user_regset score7_regsets[] = {
 	[REGSET_GENERAL] = {
 		.core_note_type	= NT_PRSTATUS,
 		.n		= ELF_NGREG,
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= genregs_get,
 		.set		= genregs_set,
 	},
 };

 static const struct user_regset_view user_score_native_view = {
 	.name		= "score7",
 	.e_machine	= EM_SCORE7,
 	.regsets	= score7_regsets,
 	.n		= ARRAY_SIZE(score7_regsets),
 };

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

 static int is_16bitinsn(unsigned long insn)
 {
 	if ((insn & INSN32_MASK) == INSN32_MASK)
 		return 0;
 	else
 		return 1;
 }

 int
 read_tsk_long(struct task_struct *child,
 		unsigned long addr, unsigned long *res)
 {
 	int copied;

 	copied = access_process_vm(child, addr, res, sizeof(*res), 0);

 	return copied != sizeof(*res) ? -EIO : 0;
 }

 int
 read_tsk_short(struct task_struct *child,
 		unsigned long addr, unsigned short *res)
 {
 	int copied;

 	copied = access_process_vm(child, addr, res, sizeof(*res), 0);

 	return copied != sizeof(*res) ? -EIO : 0;
 }

 static int
 write_tsk_short(struct task_struct *child,
 		unsigned long addr, unsigned short val)
 {
 	int copied;

 	copied = access_process_vm(child, addr, &val, sizeof(val), 1);

 	return copied != sizeof(val) ? -EIO : 0;
 }

 static int
 write_tsk_long(struct task_struct *child,
 		unsigned long addr, unsigned long val)
 {
 	int copied;

 	copied = access_process_vm(child, addr, &val, sizeof(val), 1);

 	return copied != sizeof(val) ? -EIO : 0;
 }

 void user_enable_single_step(struct task_struct *child)
 {
 	/* far_epc is the target of branch */
 	unsigned int epc, far_epc = 0;
 	unsigned long epc_insn, far_epc_insn;
 	int ninsn_type;			/* next insn type 0=16b, 1=32b */
 	unsigned int tmp, tmp2;
 	struct pt_regs *regs = task_pt_regs(child);
 	child->thread.single_step = 1;
 	child->thread.ss_nextcnt = 1;
 	epc = regs->cp0_epc;

 	read_tsk_long(child, epc, &epc_insn);

 	if (is_16bitinsn(epc_insn)) {
 		if ((epc_insn & J16M) == J16) {
 			tmp = epc_insn & 0xFFE;
 			epc = (epc & 0xFFFFF000) | tmp;
 		} else if ((epc_insn & B16M) == B16) {
 			child->thread.ss_nextcnt = 2;
 			tmp = (epc_insn & 0xFF) << 1;
 			tmp = tmp << 23;
 			tmp = (unsigned int)((int) tmp >> 23);
 			far_epc = epc + tmp;
 			epc += 2;
 		} else if ((epc_insn & BR16M) == BR16) {
 			child->thread.ss_nextcnt = 2;
 			tmp = (epc_insn >> 4) & 0xF;
 			far_epc = regs->regs[tmp];
 			epc += 2;
 		} else
 			epc += 2;
 	} else {
 		if ((epc_insn & J32M) == J32) {
 			tmp = epc_insn & 0x03FFFFFE;
 			tmp2 = tmp & 0x7FFF;
 			tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
 			epc = (epc & 0xFFC00000) | tmp;
 		} else if ((epc_insn & B32M) == B32) {
 			child->thread.ss_nextcnt = 2;
 			tmp = epc_insn & 0x03FFFFFE;	/* discard LK bit */
 			tmp2 = tmp & 0x3FF;
 			tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /* 20bit */
 			tmp = tmp << 12;
 			tmp = (unsigned int)((int) tmp >> 12);
 			far_epc = epc + tmp;
 			epc += 4;
 		} else if ((epc_insn & BR32M) == BR32) {
 			child->thread.ss_nextcnt = 2;
 			tmp = (epc_insn >> 16) & 0x1F;
 			far_epc = regs->regs[tmp];
 			epc += 4;
 		} else
 			epc += 4;
 	}

 	if (child->thread.ss_nextcnt == 1) {
 		read_tsk_long(child, epc, &epc_insn);

 		if (is_16bitinsn(epc_insn)) {
 			write_tsk_short(child, epc, SINGLESTEP16_INSN);
 			ninsn_type = 0;
 		} else {
 			write_tsk_long(child, epc, SINGLESTEP32_INSN);
 			ninsn_type = 1;
 		}

 		if (ninsn_type == 0) {  /* 16bits */
 			child->thread.insn1_type = 0;
 			child->thread.addr1 = epc;
 			 /* the insn may have 32bit data */
 			child->thread.insn1 = (short)epc_insn;
 		} else {
 			child->thread.insn1_type = 1;
 			child->thread.addr1 = epc;
 			child->thread.insn1 = epc_insn;
 		}
 	} else {
 		/* branch! have two target child->thread.ss_nextcnt=2 */
 		read_tsk_long(child, epc, &epc_insn);
 		read_tsk_long(child, far_epc, &far_epc_insn);
 		if (is_16bitinsn(epc_insn)) {
 			write_tsk_short(child, epc, SINGLESTEP16_INSN);
 			ninsn_type = 0;
 		} else {
 			write_tsk_long(child, epc, SINGLESTEP32_INSN);
 			ninsn_type = 1;
 		}

 		if (ninsn_type == 0) {  /* 16bits */
 			child->thread.insn1_type = 0;
 			child->thread.addr1 = epc;
 			 /* the insn may have 32bit data */
 			child->thread.insn1 = (short)epc_insn;
 		} else {
 			child->thread.insn1_type = 1;
 			child->thread.addr1 = epc;
 			child->thread.insn1 = epc_insn;
 		}

 		if (is_16bitinsn(far_epc_insn)) {
 			write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
 			ninsn_type = 0;
 		} else {
 			write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
 			ninsn_type = 1;
 		}

 		if (ninsn_type == 0) {  /* 16bits */
 			child->thread.insn2_type = 0;
 			child->thread.addr2 = far_epc;
 			 /* the insn may have 32bit data */
 			child->thread.insn2 = (short)far_epc_insn;
 		} else {
 			child->thread.insn2_type = 1;
 			child->thread.addr2 = far_epc;
 			child->thread.insn2 = far_epc_insn;
 		}
 	}
 }

 void user_disable_single_step(struct task_struct *child)
 {
 	if (child->thread.insn1_type == 0)
 		write_tsk_short(child, child->thread.addr1,
 				child->thread.insn1);

 	if (child->thread.insn1_type == 1)
 		write_tsk_long(child, child->thread.addr1,
 				child->thread.insn1);

 	if (child->thread.ss_nextcnt == 2) {	/* branch */
 		if (child->thread.insn1_type == 0)
 			write_tsk_short(child, child->thread.addr1,
 					child->thread.insn1);
 		if (child->thread.insn1_type == 1)
 			write_tsk_long(child, child->thread.addr1,
 					child->thread.insn1);
 		if (child->thread.insn2_type == 0)
 			write_tsk_short(child, child->thread.addr2,
 					child->thread.insn2);
 		if (child->thread.insn2_type == 1)
 			write_tsk_long(child, child->thread.addr2,
 					child->thread.insn2);
 	}

 	child->thread.single_step = 0;
 	child->thread.ss_nextcnt = 0;
 }

 void ptrace_disable(struct task_struct *child)
 {
 	user_disable_single_step(child);
 }

 long
 arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
 	int ret;
 	unsigned long __user *datap = (void __user *)data;

 	switch (request) {
 	case PTRACE_GETREGS:
 		ret = copy_regset_to_user(child, &user_score_native_view,
 						REGSET_GENERAL,
 						0, sizeof(struct pt_regs),
 						(void __user *)datap);
 		break;

 	case PTRACE_SETREGS:
 		ret = copy_regset_from_user(child, &user_score_native_view,
 						REGSET_GENERAL,
 						0, sizeof(struct pt_regs),
 						(const void __user *)datap);
 		break;

 	default:
 		ret = ptrace_request(child, request, addr, data);
 		break;
 	}

 	return ret;
 }

 /*
  * Notification of system call entry/exit
  * - triggered by current->work.syscall_trace
  */
 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
 {
 	if (!(current->ptrace & PT_PTRACED))
 		return;

 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
 		return;

 	/* The 0x80 provides a way for the tracing parent to distinguish
 	   between a syscall stop and SIGTRAP delivery. */
 	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;
 	}
 }
	/*
	* arch/score/kernel/ptrace.c
	*
	* Score Processor version.
	*
	* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
	* Chen Liqin <liqin.chen@sunplusct.com>
	* Lennox Wu <lennox.wu@sunplusct.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/elf.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/ptrace.h>
	#include <linux/regset.h>

	#include <asm/uaccess.h>

	/*
	* retrieve the contents of SCORE userspace general registers
	*/
	static int genregs_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;

	/* skip 9 * sizeof(unsigned long) not use for pt_regs */
	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	0, offsetof(struct pt_regs, regs));

	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	offsetof(struct pt_regs, regs),
	offsetof(struct pt_regs, cp0_condition));

	if (!ret)
	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_regs), -1);

	return ret;
	}

	/*
	* update the contents of the SCORE userspace general registers
	*/
	static int genregs_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;

	/* skip 9 * sizeof(unsigned long) */
	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	0, offsetof(struct pt_regs, regs));

	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	offsetof(struct pt_regs, regs),
	offsetof(struct pt_regs, cp0_condition));

	if (!ret)
	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_regs), -1);

	return ret;
	}

	/*
	* Define the register sets available on the score7 under Linux
	*/
	enum score7_regset {
	REGSET_GENERAL,
	};

	static const struct user_regset score7_regsets[] = {
	[REGSET_GENERAL] = {
	.core_note_type = NT_PRSTATUS,
	.n = ELF_NGREG,
	.size = sizeof(long),
	.align = sizeof(long),
	.get = genregs_get,
	.set = genregs_set,
	},
	};

	static const struct user_regset_view user_score_native_view = {
	.name = "score7",
	.e_machine = EM_SCORE7,
	.regsets = score7_regsets,
	.n = ARRAY_SIZE(score7_regsets),
	};

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

	static int is_16bitinsn(unsigned long insn)
	{
	if ((insn & INSN32_MASK) == INSN32_MASK)
	return 0;
	else
	return 1;
	}

	int
	read_tsk_long(struct task_struct *child,
	unsigned long addr, unsigned long *res)
	{
	int copied;

	copied = access_process_vm(child, addr, res, sizeof(*res), 0);

	return copied != sizeof(*res) ? -EIO : 0;
	}

	int
	read_tsk_short(struct task_struct *child,
	unsigned long addr, unsigned short *res)
	{
	int copied;

	copied = access_process_vm(child, addr, res, sizeof(*res), 0);

	return copied != sizeof(*res) ? -EIO : 0;
	}

	static int
	write_tsk_short(struct task_struct *child,
	unsigned long addr, unsigned short val)
	{
	int copied;

	copied = access_process_vm(child, addr, &val, sizeof(val), 1);

	return copied != sizeof(val) ? -EIO : 0;
	}

	static int
	write_tsk_long(struct task_struct *child,
	unsigned long addr, unsigned long val)
	{
	int copied;

	copied = access_process_vm(child, addr, &val, sizeof(val), 1);

	return copied != sizeof(val) ? -EIO : 0;
	}

	void user_enable_single_step(struct task_struct *child)
	{
	/* far_epc is the target of branch */
	unsigned int epc, far_epc = 0;
	unsigned long epc_insn, far_epc_insn;
	int ninsn_type; /* next insn type 0=16b, 1=32b */
	unsigned int tmp, tmp2;
	struct pt_regs *regs = task_pt_regs(child);
	child->thread.single_step = 1;
	child->thread.ss_nextcnt = 1;
	epc = regs->cp0_epc;

	read_tsk_long(child, epc, &epc_insn);

	if (is_16bitinsn(epc_insn)) {
	if ((epc_insn & J16M) == J16) {
	tmp = epc_insn & 0xFFE;
	epc = (epc & 0xFFFFF000) \| tmp;
	} else if ((epc_insn & B16M) == B16) {
	child->thread.ss_nextcnt = 2;
	tmp = (epc_insn & 0xFF) << 1;
	tmp = tmp << 23;
	tmp = (unsigned int)((int) tmp >> 23);
	far_epc = epc + tmp;
	epc += 2;
	} else if ((epc_insn & BR16M) == BR16) {
	child->thread.ss_nextcnt = 2;
	tmp = (epc_insn >> 4) & 0xF;
	far_epc = regs->regs[tmp];
	epc += 2;
	} else
	epc += 2;
	} else {
	if ((epc_insn & J32M) == J32) {
	tmp = epc_insn & 0x03FFFFFE;
	tmp2 = tmp & 0x7FFF;
	tmp = (((tmp >> 16) & 0x3FF) << 15) \| tmp2;
	epc = (epc & 0xFFC00000) \| tmp;
	} else if ((epc_insn & B32M) == B32) {
	child->thread.ss_nextcnt = 2;
	tmp = epc_insn & 0x03FFFFFE; /* discard LK bit */
	tmp2 = tmp & 0x3FF;
	tmp = (((tmp >> 16) & 0x3FF) << 10) \| tmp2; /* 20bit */
	tmp = tmp << 12;
	tmp = (unsigned int)((int) tmp >> 12);
	far_epc = epc + tmp;
	epc += 4;
	} else if ((epc_insn & BR32M) == BR32) {
	child->thread.ss_nextcnt = 2;
	tmp = (epc_insn >> 16) & 0x1F;
	far_epc = regs->regs[tmp];
	epc += 4;
	} else
	epc += 4;
	}

	if (child->thread.ss_nextcnt == 1) {
	read_tsk_long(child, epc, &epc_insn);

	if (is_16bitinsn(epc_insn)) {
	write_tsk_short(child, epc, SINGLESTEP16_INSN);
	ninsn_type = 0;
	} else {
	write_tsk_long(child, epc, SINGLESTEP32_INSN);
	ninsn_type = 1;
	}

	if (ninsn_type == 0) { /* 16bits */
	child->thread.insn1_type = 0;
	child->thread.addr1 = epc;
	/* the insn may have 32bit data */
	child->thread.insn1 = (short)epc_insn;
	} else {
	child->thread.insn1_type = 1;
	child->thread.addr1 = epc;
	child->thread.insn1 = epc_insn;
	}
	} else {
	/* branch! have two target child->thread.ss_nextcnt=2 */
	read_tsk_long(child, epc, &epc_insn);
	read_tsk_long(child, far_epc, &far_epc_insn);
	if (is_16bitinsn(epc_insn)) {
	write_tsk_short(child, epc, SINGLESTEP16_INSN);
	ninsn_type = 0;
	} else {
	write_tsk_long(child, epc, SINGLESTEP32_INSN);
	ninsn_type = 1;
	}

	if (ninsn_type == 0) { /* 16bits */
	child->thread.insn1_type = 0;
	child->thread.addr1 = epc;
	/* the insn may have 32bit data */
	child->thread.insn1 = (short)epc_insn;
	} else {
	child->thread.insn1_type = 1;
	child->thread.addr1 = epc;
	child->thread.insn1 = epc_insn;
	}

	if (is_16bitinsn(far_epc_insn)) {
	write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
	ninsn_type = 0;
	} else {
	write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
	ninsn_type = 1;
	}

	if (ninsn_type == 0) { /* 16bits */
	child->thread.insn2_type = 0;
	child->thread.addr2 = far_epc;
	/* the insn may have 32bit data */
	child->thread.insn2 = (short)far_epc_insn;
	} else {
	child->thread.insn2_type = 1;
	child->thread.addr2 = far_epc;
	child->thread.insn2 = far_epc_insn;
	}
	}
	}

	void user_disable_single_step(struct task_struct *child)
	{
	if (child->thread.insn1_type == 0)
	write_tsk_short(child, child->thread.addr1,
	child->thread.insn1);

	if (child->thread.insn1_type == 1)
	write_tsk_long(child, child->thread.addr1,
	child->thread.insn1);

	if (child->thread.ss_nextcnt == 2) { /* branch */
	if (child->thread.insn1_type == 0)
	write_tsk_short(child, child->thread.addr1,
	child->thread.insn1);
	if (child->thread.insn1_type == 1)
	write_tsk_long(child, child->thread.addr1,
	child->thread.insn1);
	if (child->thread.insn2_type == 0)
	write_tsk_short(child, child->thread.addr2,
	child->thread.insn2);
	if (child->thread.insn2_type == 1)
	write_tsk_long(child, child->thread.addr2,
	child->thread.insn2);
	}

	child->thread.single_step = 0;
	child->thread.ss_nextcnt = 0;
	}

	void ptrace_disable(struct task_struct *child)
	{
	user_disable_single_step(child);
	}

	long
	arch_ptrace(struct task_struct *child, long request, long addr, long data)
	{
	int ret;
	unsigned long __user datap = (void __user )data;

	switch (request) {
	case PTRACE_GETREGS:
	ret = copy_regset_to_user(child, &user_score_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	(void __user *)datap);
	break;

	case PTRACE_SETREGS:
	ret = copy_regset_from_user(child, &user_score_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	(const void __user *)datap);
	break;

	default:
	ret = ptrace_request(child, request, addr, data);
	break;
	}

	return ret;
	}

	/*
	* Notification of system call entry/exit
	* - triggered by current->work.syscall_trace
	*/
	asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
	{
	if (!(current->ptrace & PT_PTRACED))
	return;

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	return;

	/* The 0x80 provides a way for the tracing parent to distinguish
	between a syscall stop and SIGTRAP delivery. */
	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;
	}
	}