[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / xtensa / kernel / ptrace.c

// TODO some minor issues
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2007  Tensilica Inc.
 *
 * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
 * Chris Zankel <chris@zankel.net>
 * Scott Foehner<sfoehner@yahoo.com>,
 * Kevin Chea
 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/security.h>
#include <linux/signal.h>

#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/elf.h>
#include <asm/coprocessor.h>

/*
 * Called by kernel/ptrace.c when detaching to disable single stepping.
 */

void ptrace_disable(struct task_struct *child)
{
	/* Nothing to do.. */
}

int ptrace_getregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	xtensa_gregset_t __user *gregset = uregs;
	unsigned long wm = regs->wmask;
	unsigned long wb = regs->windowbase;
	int live, i;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
		return -EIO;

	__put_user(regs->pc, &gregset->pc);
	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	__put_user(regs->lbeg, &gregset->lbeg);
	__put_user(regs->lend, &gregset->lend);
	__put_user(regs->lcount, &gregset->lcount);
	__put_user(regs->windowstart, &gregset->windowstart);
	__put_user(regs->windowbase, &gregset->windowbase);

	live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;

	for (i = 0; i < live; i++)
		__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
		__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));

	return 0;
}

int ptrace_setregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	xtensa_gregset_t *gregset = uregs;
	const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
	unsigned long ps;
	unsigned long wb;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
		return -EIO;

	__get_user(regs->pc, &gregset->pc);
	__get_user(ps, &gregset->ps);
	__get_user(regs->lbeg, &gregset->lbeg);
	__get_user(regs->lend, &gregset->lend);
	__get_user(regs->lcount, &gregset->lcount);
	__get_user(regs->windowstart, &gregset->windowstart);
	__get_user(wb, &gregset->windowbase);

	regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);

	if (wb >= XCHAL_NUM_AREGS / 4)
		return -EFAULT;

	regs->windowbase = wb;

	if (wb != 0 &&  __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
					 gregset->a, wb * 16))
		return -EFAULT;

	if (__copy_from_user(regs->areg, gregset->a + wb*4, (WSBITS-wb) * 16))
		return -EFAULT;

	return 0;
}


int ptrace_getxregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	struct thread_info *ti = task_thread_info(child);
	elf_xtregs_t __user *xtregs = uregs;
	int ret = 0;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
		return -EIO;

#if XTENSA_HAVE_COPROCESSORS
	/* Flush all coprocessor registers to memory. */
	coprocessor_flush_all(ti);
	ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
			      sizeof(xtregs_coprocessor_t));
#endif
	ret |= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
			      sizeof(xtregs->opt));
	ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
			      sizeof(xtregs->user));

	return ret ? -EFAULT : 0;
}

int ptrace_setxregs(struct task_struct *child, void __user *uregs)
{
	struct thread_info *ti = task_thread_info(child);
	struct pt_regs *regs = task_pt_regs(child);
	elf_xtregs_t *xtregs = uregs;
	int ret = 0;

#if XTENSA_HAVE_COPROCESSORS
	/* Flush all coprocessors before we overwrite them. */
	coprocessor_flush_all(ti);
	coprocessor_release_all(ti);

	ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0, 
				sizeof(xtregs_coprocessor_t));
#endif
	ret |= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
				sizeof(xtregs->opt));
	ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
				sizeof(xtregs->user));

	return ret ? -EFAULT : 0;
}

int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
{
	struct pt_regs *regs;
	unsigned long tmp;

	regs = task_pt_regs(child);
	tmp = 0;  /* Default return value. */

	switch(regno) {

		case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
			tmp = regs->areg[regno - REG_AR_BASE];
			break;

		case REG_A_BASE ... REG_A_BASE + 15:
			tmp = regs->areg[regno - REG_A_BASE];
			break;

		case REG_PC:
			tmp = regs->pc;
			break;

		case REG_PS:
			/* Note:  PS.EXCM is not set while user task is running;
			 * its being set in regs is for exception handling
			 * convenience.  */
			tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
			break;

		case REG_WB:
			break;		/* tmp = 0 */

		case REG_WS:
		{
			unsigned long wb = regs->windowbase;
			unsigned long ws = regs->windowstart;
			tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
			break;
		}
		case REG_LBEG:
			tmp = regs->lbeg;
			break;

		case REG_LEND:
			tmp = regs->lend;
			break;

		case REG_LCOUNT:
			tmp = regs->lcount;
			break;

		case REG_SAR:
			tmp = regs->sar;
			break;

		case SYSCALL_NR:
			tmp = regs->syscall;
			break;

		default:
			return -EIO;
	}
	return put_user(tmp, ret);
}

int ptrace_pokeusr(struct task_struct *child, long regno, long val)
{
	struct pt_regs *regs;
	regs = task_pt_regs(child);

	switch (regno) {
		case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
			regs->areg[regno - REG_AR_BASE] = val;
			break;

		case REG_A_BASE ... REG_A_BASE + 15:
			regs->areg[regno - REG_A_BASE] = val;
			break;

		case REG_PC:
			regs->pc = val;
			break;

		case SYSCALL_NR:
			regs->syscall = val;
			break;

		default:
			return -EIO;
	}
	return 0;
}

long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
	int ret = -EPERM;

	switch (request) {
	case PTRACE_PEEKTEXT:	/* read word at location addr. */
	case PTRACE_PEEKDATA:
		ret = generic_ptrace_peekdata(child, addr, data);
		break;

	case PTRACE_PEEKUSR:	/* read register specified by addr. */
		ret = ptrace_peekusr(child, addr, (void __user *) data);
		break;

	case PTRACE_POKETEXT:	/* write the word at location addr. */
	case PTRACE_POKEDATA:
		ret = generic_ptrace_pokedata(child, addr, data);
		break;

	case PTRACE_POKEUSR:	/* write register specified by addr. */
		ret = ptrace_pokeusr(child, addr, data);
		break;

	/* continue and stop at next (return from) syscall */

	case PTRACE_SYSCALL:
	case PTRACE_CONT: /* restart after signal. */
	{
		ret = -EIO;
		if (!valid_signal(data))
			break;
		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;
		/* Make sure the single step bit is not set. */
		child->ptrace &= ~PT_SINGLESTEP;
		wake_up_process(child);
		ret = 0;
		break;
	}

	/*
	 * 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:
		ret = 0;
		if (child->exit_state == EXIT_ZOMBIE)	/* already dead */
			break;
		child->exit_code = SIGKILL;
		child->ptrace &= ~PT_SINGLESTEP;
		wake_up_process(child);
		break;

	case PTRACE_SINGLESTEP:
		ret = -EIO;
		if (!valid_signal(data))
			break;
		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
		child->ptrace |= PT_SINGLESTEP;
		child->exit_code = data;
		wake_up_process(child);
		ret = 0;
		break;

	case PTRACE_GETREGS:
		ret = ptrace_getregs(child, (void __user *) data);
		break;

	case PTRACE_SETREGS:
		ret = ptrace_setregs(child, (void __user *) data);
		break;

	case PTRACE_GETXTREGS:
		ret = ptrace_getxregs(child, (void __user *) data);
		break;

	case PTRACE_SETXTREGS:
		ret = ptrace_setxregs(child, (void __user *) data);
		break;

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

	return ret;
}

void do_syscall_trace(void)
{
	/*
	 * 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;
	}
}

void do_syscall_trace_enter(struct pt_regs *regs)
{
	if (test_thread_flag(TIF_SYSCALL_TRACE)
			&& (current->ptrace & PT_PTRACED))
		do_syscall_trace();

#if 0
	if (unlikely(current->audit_context))
		audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
#endif
}

void do_syscall_trace_leave(struct pt_regs *regs)
{
	if ((test_thread_flag(TIF_SYSCALL_TRACE))
			&& (current->ptrace & PT_PTRACED))
		do_syscall_trace();
}
Commit	Line	Data
5a0015d6 CZ	1	// TODO some minor issues
	2	/*
	3	* This file is subject to the terms and conditions of the GNU General Public
	4	* License. See the file "COPYING" in the main directory of this archive
	5	* for more details.
	6	*
c658eac6	7	* Copyright (C) 2001 - 2007 Tensilica Inc.
5a0015d6 CZ	8	*
	9	* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
	10	* Chris Zankel <chris@zankel.net>
	11	* Scott Foehner<sfoehner@yahoo.com>,
	12	* Kevin Chea
	13	* Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
	14	*/
	15
5a0015d6 CZ	16	#include <linux/kernel.h>
	17	#include <linux/sched.h>
	18	#include <linux/mm.h>
	19	#include <linux/errno.h>
	20	#include <linux/ptrace.h>
	21	#include <linux/smp.h>
5a0015d6	22	#include <linux/security.h>
0ee23b50	23	#include <linux/signal.h>
5a0015d6 CZ	24
	25	#include <asm/pgtable.h>
	26	#include <asm/page.h>
	27	#include <asm/system.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/ptrace.h>
	30	#include <asm/elf.h>
c658eac6	31	#include <asm/coprocessor.h>
5a0015d6 CZ	32
5a0015d6 CZ	33	/*
c658eac6	34	* Called by kernel/ptrace.c when detaching to disable single stepping.
5a0015d6 CZ	35	*/
	36
	37	void ptrace_disable(struct task_struct *child)
	38	{
	39	/* Nothing to do.. */
	40	}
	41
c658eac6	42	int ptrace_getregs(struct task_struct child, void __user uregs)
5a0015d6	43	{
c658eac6 CZ	44	struct pt_regs *regs = task_pt_regs(child);
c658eac6 CZ	45	xtensa_gregset_t __user *gregset = uregs;
c658eac6	46	unsigned long wm = regs->wmask;
42086cec CZ	47	unsigned long wb = regs->windowbase;
42086cec CZ	48	int live, i;
c658eac6 CZ	49
	50	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	51	return -EIO;
	52
42086cec CZ	53	__put_user(regs->pc, &gregset->pc);
	54	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	55	__put_user(regs->lbeg, &gregset->lbeg);
	56	__put_user(regs->lend, &gregset->lend);
	57	__put_user(regs->lcount, &gregset->lcount);
	58	__put_user(regs->windowstart, &gregset->windowstart);
	59	__put_user(regs->windowbase, &gregset->windowbase);
c658eac6 CZ	60
c658eac6 CZ	61	live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
c658eac6	62
42086cec CZ	63	for (i = 0; i < live; i++)
	64	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	65	for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
	66	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	67
	68	return 0;
c658eac6	69	}
5a0015d6	70
c658eac6 CZ	71	int ptrace_setregs(struct task_struct child, void __user uregs)
	72	{
	73	struct pt_regs *regs = task_pt_regs(child);
	74	xtensa_gregset_t *gregset = uregs;
	75	const unsigned long ps_mask = PS_CALLINC_MASK \| PS_OWB_MASK;
c658eac6	76	unsigned long ps;
42086cec	77	unsigned long wb;
c658eac6 CZ	78
	79	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	80	return -EIO;
	81
42086cec CZ	82	__get_user(regs->pc, &gregset->pc);
	83	__get_user(ps, &gregset->ps);
	84	__get_user(regs->lbeg, &gregset->lbeg);
	85	__get_user(regs->lend, &gregset->lend);
	86	__get_user(regs->lcount, &gregset->lcount);
	87	__get_user(regs->windowstart, &gregset->windowstart);
	88	__get_user(wb, &gregset->windowbase);
c658eac6 CZ	89
	90	regs->ps = (regs->ps & ~ps_mask) \| (ps & ps_mask) \| (1 << PS_EXCM_BIT);
	91
42086cec CZ	92	if (wb >= XCHAL_NUM_AREGS / 4)
42086cec CZ	93	return -EFAULT;
c658eac6	94
42086cec CZ	95	regs->windowbase = wb;
	96
	97	if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
	98	gregset->a, wb * 16))
	99	return -EFAULT;
	100
	101	if (__copy_from_user(regs->areg, gregset->a + wb4, (WSBITS-wb) 16))
	102	return -EFAULT;
	103
	104	return 0;
c658eac6	105	}
5a0015d6	106
5a0015d6	107
c658eac6 CZ	108	int ptrace_getxregs(struct task_struct child, void __user uregs)
	109	{
	110	struct pt_regs *regs = task_pt_regs(child);
	111	struct thread_info *ti = task_thread_info(child);
	112	elf_xtregs_t __user *xtregs = uregs;
	113	int ret = 0;
	114
	115	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
	116	return -EIO;
	117
	118	#if XTENSA_HAVE_COPROCESSORS
	119	/* Flush all coprocessor registers to memory. */
	120	coprocessor_flush_all(ti);
	121	ret \|= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
	122	sizeof(xtregs_coprocessor_t));
	123	#endif
	124	ret \|= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
	125	sizeof(xtregs->opt));
	126	ret \|= __copy_to_user(&xtregs->user,&ti->xtregs_user,
	127	sizeof(xtregs->user));
5a0015d6	128
c658eac6 CZ	129	return ret ? -EFAULT : 0;
	130	}
	131
	132	int ptrace_setxregs(struct task_struct child, void __user uregs)
	133	{
	134	struct thread_info *ti = task_thread_info(child);
	135	struct pt_regs *regs = task_pt_regs(child);
	136	elf_xtregs_t *xtregs = uregs;
	137	int ret = 0;
	138
	139	#if XTENSA_HAVE_COPROCESSORS
	140	/* Flush all coprocessors before we overwrite them. */
	141	coprocessor_flush_all(ti);
	142	coprocessor_release_all(ti);
	143
	144	ret \|= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
	145	sizeof(xtregs_coprocessor_t));
	146	#endif
	147	ret \|= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
	148	sizeof(xtregs->opt));
	149	ret \|= __copy_from_user(&ti->xtregs_user, &xtregs->user,
	150	sizeof(xtregs->user));
	151
	152	return ret ? -EFAULT : 0;
	153	}
	154
	155	int ptrace_peekusr(struct task_struct child, long regno, long __user ret)
	156	{
	157	struct pt_regs *regs;
	158	unsigned long tmp;
	159
	160	regs = task_pt_regs(child);
	161	tmp = 0; /* Default return value. */
5a0015d6	162
c658eac6	163	switch(regno) {
5a0015d6 CZ	164
5a0015d6 CZ	165	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	166	tmp = regs->areg[regno - REG_AR_BASE];
5a0015d6	167	break;
c658eac6	168
5a0015d6	169	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	170	tmp = regs->areg[regno - REG_A_BASE];
5a0015d6	171	break;
c658eac6	172
5a0015d6 CZ	173	case REG_PC:
	174	tmp = regs->pc;
	175	break;
c658eac6	176
5a0015d6 CZ	177	case REG_PS:
	178	/* Note: PS.EXCM is not set while user task is running;
	179	* its being set in regs is for exception handling
	180	* convenience. */
173d6681	181	tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
5a0015d6	182	break;
c658eac6	183
5a0015d6	184	case REG_WB:
c658eac6 CZ	185	break; /* tmp = 0 */
c658eac6 CZ	186
5a0015d6	187	case REG_WS:
c658eac6 CZ	188	{
	189	unsigned long wb = regs->windowbase;
	190	unsigned long ws = regs->windowstart;
	191	tmp = ((ws>>wb) \| (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
5a0015d6	192	break;
c658eac6	193	}
5a0015d6 CZ	194	case REG_LBEG:
	195	tmp = regs->lbeg;
	196	break;
c658eac6	197
5a0015d6 CZ	198	case REG_LEND:
	199	tmp = regs->lend;
	200	break;
c658eac6	201
5a0015d6 CZ	202	case REG_LCOUNT:
	203	tmp = regs->lcount;
	204	break;
c658eac6	205
5a0015d6 CZ	206	case REG_SAR:
	207	tmp = regs->sar;
	208	break;
c658eac6	209
5a0015d6 CZ	210	case SYSCALL_NR:
	211	tmp = regs->syscall;
	212	break;
5a0015d6	213
c658eac6 CZ	214	default:
	215	return -EIO;
	216	}
	217	return put_user(tmp, ret);
	218	}
5a0015d6	219
c658eac6 CZ	220	int ptrace_pokeusr(struct task_struct *child, long regno, long val)
	221	{
	222	struct pt_regs *regs;
	223	regs = task_pt_regs(child);
5a0015d6	224
c658eac6	225	switch (regno) {
5a0015d6	226	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	227	regs->areg[regno - REG_AR_BASE] = val;
5a0015d6	228	break;
c658eac6	229
5a0015d6	230	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	231	regs->areg[regno - REG_A_BASE] = val;
5a0015d6	232	break;
c658eac6	233
5a0015d6	234	case REG_PC:
c658eac6	235	regs->pc = val;
5a0015d6	236	break;
c658eac6	237
5a0015d6	238	case SYSCALL_NR:
c658eac6	239	regs->syscall = val;
5a0015d6	240	break;
5a0015d6 CZ	241
5a0015d6 CZ	242	default:
c658eac6 CZ	243	return -EIO;
	244	}
	245	return 0;
	246	}
	247
	248	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	249	{
	250	int ret = -EPERM;
	251
	252	switch (request) {
	253	case PTRACE_PEEKTEXT: /* read word at location addr. */
	254	case PTRACE_PEEKDATA:
	255	ret = generic_ptrace_peekdata(child, addr, data);
	256	break;
	257
	258	case PTRACE_PEEKUSR: /* read register specified by addr. */
	259	ret = ptrace_peekusr(child, addr, (void __user *) data);
	260	break;
	261
	262	case PTRACE_POKETEXT: /* write the word at location addr. */
	263	case PTRACE_POKEDATA:
	264	ret = generic_ptrace_pokedata(child, addr, data);
	265	break;
	266
	267	case PTRACE_POKEUSR: /* write register specified by addr. */
	268	ret = ptrace_pokeusr(child, addr, data);
5a0015d6	269	break;
5a0015d6 CZ	270
5a0015d6 CZ	271	/* continue and stop at next (return from) syscall */
c658eac6	272
5a0015d6 CZ	273	case PTRACE_SYSCALL:
	274	case PTRACE_CONT: /* restart after signal. */
	275	{
	276	ret = -EIO;
0ee23b50	277	if (!valid_signal(data))
5a0015d6 CZ	278	break;
	279	if (request == PTRACE_SYSCALL)
	280	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	281	else
	282	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	283	child->exit_code = data;
	284	/* Make sure the single step bit is not set. */
	285	child->ptrace &= ~PT_SINGLESTEP;
	286	wake_up_process(child);
	287	ret = 0;
	288	break;
	289	}
	290
	291	/*
	292	* make the child exit. Best I can do is send it a sigkill.
	293	* perhaps it should be put in the status that it wants to
	294	* exit.
	295	*/
	296	case PTRACE_KILL:
	297	ret = 0;
d742eae8	298	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
5a0015d6 CZ	299	break;
	300	child->exit_code = SIGKILL;
	301	child->ptrace &= ~PT_SINGLESTEP;
	302	wake_up_process(child);
	303	break;
	304
	305	case PTRACE_SINGLESTEP:
	306	ret = -EIO;
0ee23b50	307	if (!valid_signal(data))
5a0015d6 CZ	308	break;
	309	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
	310	child->ptrace \|= PT_SINGLESTEP;
	311	child->exit_code = data;
	312	wake_up_process(child);
	313	ret = 0;
	314	break;
	315
	316	case PTRACE_GETREGS:
c658eac6	317	ret = ptrace_getregs(child, (void __user *) data);
5a0015d6	318	break;
5a0015d6 CZ	319
5a0015d6 CZ	320	case PTRACE_SETREGS:
c658eac6	321	ret = ptrace_setregs(child, (void __user *) data);
5a0015d6	322	break;
5a0015d6	323
c658eac6 CZ	324	case PTRACE_GETXTREGS:
c658eac6 CZ	325	ret = ptrace_getxregs(child, (void __user *) data);
5a0015d6	326	break;
5a0015d6	327
c658eac6 CZ	328	case PTRACE_SETXTREGS:
c658eac6 CZ	329	ret = ptrace_setxregs(child, (void __user *) data);
5a0015d6 CZ	330	break;
5a0015d6 CZ	331
5a0015d6 CZ	332	default:
5a0015d6 CZ	333	ret = ptrace_request(child, request, addr, data);
c658eac6	334	break;
5a0015d6	335	}
c658eac6	336
5a0015d6 CZ	337	return ret;
	338	}
	339
	340	void do_syscall_trace(void)
	341	{
5a0015d6 CZ	342	/*
	343	* The 0x80 provides a way for the tracing parent to distinguish
	344	* between a syscall stop and SIGTRAP delivery
	345	*/
	346	ptrace_notify(SIGTRAP\|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
	347
	348	/*
	349	* this isn't the same as continuing with a signal, but it will do
	350	* for normal use. strace only continues with a signal if the
	351	* stopping signal is not SIGTRAP. -brl
	352	*/
	353	if (current->exit_code) {
	354	send_sig(current->exit_code, current, 1);
	355	current->exit_code = 0;
	356	}
	357	}
fc4fb2ad CZ	358
	359	void do_syscall_trace_enter(struct pt_regs *regs)
	360	{
	361	if (test_thread_flag(TIF_SYSCALL_TRACE)
	362	&& (current->ptrace & PT_PTRACED))
	363	do_syscall_trace();
	364
	365	#if 0
	366	if (unlikely(current->audit_context))
	367	audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
	368	#endif
	369	}
	370
	371	void do_syscall_trace_leave(struct pt_regs *regs)
	372	{
	373	if ((test_thread_flag(TIF_SYSCALL_TRACE))
	374	&& (current->ptrace & PT_PTRACED))
	375	do_syscall_trace();
	376	}
	377