[linux-2.6-block.git] / arch / parisc / kernel / ptrace.c

/*
 * Kernel support for the ptrace() and syscall tracing interfaces.
 *
 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
 * Copyright (C) 2008 Helge Deller <deller@gmx.de>
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/user.h>
#include <linux/personality.h>
#include <linux/security.h>
#include <linux/seccomp.h>
#include <linux/compat.h>
#include <linux/signal.h>
#include <linux/audit.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/asm-offsets.h>

/* PSW bits we allow the debugger to modify */
#define USER_PSW_BITS	(PSW_N | PSW_B | PSW_V | PSW_CB)

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure single step bits etc are not set.
 */
void ptrace_disable(struct task_struct *task)
{
	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);

	/* make sure the trap bits are not set */
	pa_psw(task)->r = 0;
	pa_psw(task)->t = 0;
	pa_psw(task)->h = 0;
	pa_psw(task)->l = 0;
}

/*
 * The following functions are called by ptrace_resume() when
 * enabling or disabling single/block tracing.
 */
void user_disable_single_step(struct task_struct *task)
{
	ptrace_disable(task);
}

void user_enable_single_step(struct task_struct *task)
{
	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
	set_tsk_thread_flag(task, TIF_SINGLESTEP);

	if (pa_psw(task)->n) {
		struct siginfo si;

		/* Nullified, just crank over the queue. */
		task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
		task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
		task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
		pa_psw(task)->n = 0;
		pa_psw(task)->x = 0;
		pa_psw(task)->y = 0;
		pa_psw(task)->z = 0;
		pa_psw(task)->b = 0;
		ptrace_disable(task);
		/* Don't wake up the task, but let the
		   parent know something happened. */
		si.si_code = TRAP_TRACE;
		si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
		si.si_signo = SIGTRAP;
		si.si_errno = 0;
		force_sig_info(SIGTRAP, &si, task);
		/* notify_parent(task, SIGCHLD); */
		return;
	}

	/* Enable recovery counter traps.  The recovery counter
	 * itself will be set to zero on a task switch.  If the
	 * task is suspended on a syscall then the syscall return
	 * path will overwrite the recovery counter with a suitable
	 * value such that it traps once back in user space.  We
	 * disable interrupts in the tasks PSW here also, to avoid
	 * interrupts while the recovery counter is decrementing.
	 */
	pa_psw(task)->r = 1;
	pa_psw(task)->t = 0;
	pa_psw(task)->h = 0;
	pa_psw(task)->l = 0;
}

void user_enable_block_step(struct task_struct *task)
{
	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
	set_tsk_thread_flag(task, TIF_BLOCKSTEP);

	/* Enable taken branch trap. */
	pa_psw(task)->r = 0;
	pa_psw(task)->t = 1;
	pa_psw(task)->h = 0;
	pa_psw(task)->l = 0;
}

long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	unsigned long tmp;
	long ret = -EIO;

	switch (request) {

	/* Read the word at location addr in the USER area.  For ptraced
	   processes, the kernel saves all regs on a syscall. */
	case PTRACE_PEEKUSR:
		if ((addr & (sizeof(unsigned long)-1)) ||
		     addr >= sizeof(struct pt_regs))
			break;
		tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
		ret = put_user(tmp, (unsigned long __user *) data);
		break;

	/* Write the word at location addr in the USER area.  This will need
	   to change when the kernel no longer saves all regs on a syscall.
	   FIXME.  There is a problem at the moment in that r3-r18 are only
	   saved if the process is ptraced on syscall entry, and even then
	   those values are overwritten by actual register values on syscall
	   exit. */
	case PTRACE_POKEUSR:
		/* Some register values written here may be ignored in
		 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
		 * r31/r31+4, and not with the values in pt_regs.
		 */
		if (addr == PT_PSW) {
			/* Allow writing to Nullify, Divide-step-correction,
			 * and carry/borrow bits.
			 * BEWARE, if you set N, and then single step, it won't
			 * stop on the nullified instruction.
			 */
			data &= USER_PSW_BITS;
			task_regs(child)->gr[0] &= ~USER_PSW_BITS;
			task_regs(child)->gr[0] |= data;
			ret = 0;
			break;
		}

		if ((addr & (sizeof(unsigned long)-1)) ||
		     addr >= sizeof(struct pt_regs))
			break;
		if ((addr >= PT_GR1 && addr <= PT_GR31) ||
				addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
				(addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
				addr == PT_SAR) {
			*(unsigned long *) ((char *) task_regs(child) + addr) = data;
			ret = 0;
		}
		break;

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

	return ret;
}


#ifdef CONFIG_COMPAT

/* This function is needed to translate 32 bit pt_regs offsets in to
 * 64 bit pt_regs offsets.  For example, a 32 bit gdb under a 64 bit kernel
 * will request offset 12 if it wants gr3, but the lower 32 bits of
 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
 * except for the fp registers which (a) are 64 bits, and (b) follow
 * the gr registers at the start of pt_regs.  The 32 bit pt_regs should
 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
 * being 64 bit in both cases.
 */

static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
{
	if (offset < 0)
		return sizeof(struct pt_regs);
	else if (offset <= 32*4)	/* gr[0..31] */
		return offset * 2 + 4;
	else if (offset <= 32*4+32*8)	/* gr[0..31] + fr[0..31] */
		return offset + 32*4;
	else if (offset < sizeof(struct pt_regs)/2 + 32*4)
		return offset * 2 + 4 - 32*8;
	else
		return sizeof(struct pt_regs);
}

long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
			compat_ulong_t addr, compat_ulong_t data)
{
	compat_uint_t tmp;
	long ret = -EIO;

	switch (request) {

	case PTRACE_PEEKUSR:
		if (addr & (sizeof(compat_uint_t)-1))
			break;
		addr = translate_usr_offset(addr);
		if (addr >= sizeof(struct pt_regs))
			break;

		tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
		ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
		break;

	/* Write the word at location addr in the USER area.  This will need
	   to change when the kernel no longer saves all regs on a syscall.
	   FIXME.  There is a problem at the moment in that r3-r18 are only
	   saved if the process is ptraced on syscall entry, and even then
	   those values are overwritten by actual register values on syscall
	   exit. */
	case PTRACE_POKEUSR:
		/* Some register values written here may be ignored in
		 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
		 * r31/r31+4, and not with the values in pt_regs.
		 */
		if (addr == PT_PSW) {
			/* Since PT_PSW==0, it is valid for 32 bit processes
			 * under 64 bit kernels as well.
			 */
			ret = arch_ptrace(child, request, addr, data);
		} else {
			if (addr & (sizeof(compat_uint_t)-1))
				break;
			addr = translate_usr_offset(addr);
			if (addr >= sizeof(struct pt_regs))
				break;
			if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
				/* Special case, fp regs are 64 bits anyway */
				*(__u64 *) ((char *) task_regs(child) + addr) = data;
				ret = 0;
			}
			else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
					addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
					addr == PT_SAR+4) {
				/* Zero the top 32 bits */
				*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
				*(__u32 *) ((char *) task_regs(child) + addr) = data;
				ret = 0;
			}
		}
		break;

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

	return ret;
}
#endif

long do_syscall_trace_enter(struct pt_regs *regs)
{
	/* Do the secure computing check first. */
	secure_computing_strict(regs->gr[20]);

	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	    tracehook_report_syscall_entry(regs)) {
		/*
		 * Tracing decided this syscall should not happen or the
		 * debugger stored an invalid system call number. Skip
		 * the system call and the system call restart handling.
		 */
		regs->gr[20] = -1UL;
		goto out;
	}

#ifdef CONFIG_64BIT
	if (!is_compat_task())
		audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
				    regs->gr[24], regs->gr[23]);
	else
#endif
		audit_syscall_entry(regs->gr[20] & 0xffffffff,
			regs->gr[26] & 0xffffffff,
			regs->gr[25] & 0xffffffff,
			regs->gr[24] & 0xffffffff,
			regs->gr[23] & 0xffffffff);

out:
	return regs->gr[20];
}

void do_syscall_trace_exit(struct pt_regs *regs)
{
	int stepping = test_thread_flag(TIF_SINGLESTEP) ||
		test_thread_flag(TIF_BLOCKSTEP);

	audit_syscall_exit(regs);

	if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(regs, stepping);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Kernel support for the ptrace() and syscall tracing interfaces.
	3	*
	4	* Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
	5	* Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
	6	* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
81e192d6	7	* Copyright (C) 2008 Helge Deller <deller@gmx.de>
1da177e4 LT	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/errno.h>
1da177e4 LT	15	#include <linux/ptrace.h>
d6b58772	16	#include <linux/tracehook.h>
1da177e4 LT	17	#include <linux/user.h>
	18	#include <linux/personality.h>
	19	#include <linux/security.h>
fe5c8734	20	#include <linux/seccomp.h>
1da177e4	21	#include <linux/compat.h>
7ed20e1a	22	#include <linux/signal.h>
527973c8	23	#include <linux/audit.h>
1da177e4 LT	24
	25	#include <asm/uaccess.h>
	26	#include <asm/pgtable.h>
1da177e4	27	#include <asm/processor.h>
0013a854	28	#include <asm/asm-offsets.h>
1da177e4 LT	29
1da177e4 LT	30	/* PSW bits we allow the debugger to modify */
34360f08	31	#define USER_PSW_BITS (PSW_N \| PSW_B \| PSW_V \| PSW_CB)
1da177e4	32
81e192d6 HD	33	/*
	34	* Called by kernel/ptrace.c when detaching..
	35	*
	36	* Make sure single step bits etc are not set.
	37	*/
	38	void ptrace_disable(struct task_struct *task)
	39	{
ecd3d4bc KM	40	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
ecd3d4bc KM	41	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
1da177e4	42
81e192d6 HD	43	/* make sure the trap bits are not set */
	44	pa_psw(task)->r = 0;
	45	pa_psw(task)->t = 0;
	46	pa_psw(task)->h = 0;
	47	pa_psw(task)->l = 0;
	48	}
	49
	50	/*
	51	* The following functions are called by ptrace_resume() when
	52	* enabling or disabling single/block tracing.
	53	*/
	54	void user_disable_single_step(struct task_struct *task)
	55	{
	56	ptrace_disable(task);
	57	}
	58
	59	void user_enable_single_step(struct task_struct *task)
	60	{
ecd3d4bc KM	61	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
ecd3d4bc KM	62	set_tsk_thread_flag(task, TIF_SINGLESTEP);
81e192d6 HD	63
	64	if (pa_psw(task)->n) {
	65	struct siginfo si;
	66
	67	/* Nullified, just crank over the queue. */
	68	task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
	69	task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
	70	task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
	71	pa_psw(task)->n = 0;
	72	pa_psw(task)->x = 0;
	73	pa_psw(task)->y = 0;
	74	pa_psw(task)->z = 0;
	75	pa_psw(task)->b = 0;
	76	ptrace_disable(task);
	77	/* Don't wake up the task, but let the
	78	parent know something happened. */
	79	si.si_code = TRAP_TRACE;
	80	si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
	81	si.si_signo = SIGTRAP;
	82	si.si_errno = 0;
	83	force_sig_info(SIGTRAP, &si, task);
	84	/* notify_parent(task, SIGCHLD); */
	85	return;
	86	}
	87
	88	/* Enable recovery counter traps. The recovery counter
	89	* itself will be set to zero on a task switch. If the
	90	* task is suspended on a syscall then the syscall return
	91	* path will overwrite the recovery counter with a suitable
	92	* value such that it traps once back in user space. We
	93	* disable interrupts in the tasks PSW here also, to avoid
	94	* interrupts while the recovery counter is decrementing.
	95	*/
	96	pa_psw(task)->r = 1;
	97	pa_psw(task)->t = 0;
	98	pa_psw(task)->h = 0;
	99	pa_psw(task)->l = 0;
	100	}
	101
	102	void user_enable_block_step(struct task_struct *task)
	103	{
ecd3d4bc KM	104	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
ecd3d4bc KM	105	set_tsk_thread_flag(task, TIF_BLOCKSTEP);
81e192d6 HD	106
	107	/* Enable taken branch trap. */
	108	pa_psw(task)->r = 0;
	109	pa_psw(task)->t = 1;
	110	pa_psw(task)->h = 0;
	111	pa_psw(task)->l = 0;
	112	}
	113
9b05a69e NK	114	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	115	unsigned long addr, unsigned long data)
81e192d6 HD	116	{
	117	unsigned long tmp;
	118	long ret = -EIO;
1da177e4	119
81e192d6 HD	120	switch (request) {
	121
	122	/* Read the word at location addr in the USER area. For ptraced
	123	processes, the kernel saves all regs on a syscall. */
	124	case PTRACE_PEEKUSR:
9b05a69e NK	125	if ((addr & (sizeof(unsigned long)-1)) \|\|
9b05a69e NK	126	addr >= sizeof(struct pt_regs))
81e192d6 HD	127	break;
81e192d6 HD	128	tmp = (unsigned long ) ((char *) task_regs(child) + addr);
1cb4953c	129	ret = put_user(tmp, (unsigned long __user *) data);
81e192d6 HD	130	break;
	131
	132	/* Write the word at location addr in the USER area. This will need
	133	to change when the kernel no longer saves all regs on a syscall.
	134	FIXME. There is a problem at the moment in that r3-r18 are only
	135	saved if the process is ptraced on syscall entry, and even then
	136	those values are overwritten by actual register values on syscall
	137	exit. */
	138	case PTRACE_POKEUSR:
	139	/* Some register values written here may be ignored in
	140	* entry.S:syscall_restore_rfi; e.g. iaoq is written with
	141	* r31/r31+4, and not with the values in pt_regs.
	142	*/
	143	if (addr == PT_PSW) {
	144	/* Allow writing to Nullify, Divide-step-correction,
	145	* and carry/borrow bits.
	146	* BEWARE, if you set N, and then single step, it won't
	147	* stop on the nullified instruction.
	148	*/
	149	data &= USER_PSW_BITS;
	150	task_regs(child)->gr[0] &= ~USER_PSW_BITS;
	151	task_regs(child)->gr[0] \|= data;
	152	ret = 0;
	153	break;
	154	}
	155
9b05a69e NK	156	if ((addr & (sizeof(unsigned long)-1)) \|\|
9b05a69e NK	157	addr >= sizeof(struct pt_regs))
81e192d6 HD	158	break;
	159	if ((addr >= PT_GR1 && addr <= PT_GR31) \|\|
	160	addr == PT_IAOQ0 \|\| addr == PT_IAOQ1 \|\|
	161	(addr >= PT_FR0 && addr <= PT_FR31 + 4) \|\|
	162	addr == PT_SAR) {
	163	(unsigned long ) ((char *) task_regs(child) + addr) = data;
	164	ret = 0;
	165	}
	166	break;
	167
	168	default:
	169	ret = ptrace_request(child, request, addr, data);
	170	break;
	171	}
	172
	173	return ret;
	174	}
	175
	176
	177	#ifdef CONFIG_COMPAT
1da177e4 LT	178
	179	/* This function is needed to translate 32 bit pt_regs offsets in to
	180	* 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
	181	* will request offset 12 if it wants gr3, but the lower 32 bits of
	182	* the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
	183	* This code relies on a 32 bit pt_regs being comprised of 32 bit values
	184	* except for the fp registers which (a) are 64 bits, and (b) follow
	185	* the gr registers at the start of pt_regs. The 32 bit pt_regs should
	186	* be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
	187	* being 64 bit in both cases.
	188	*/
	189
ed79b86d	190	static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
1da177e4 LT	191	{
1da177e4 LT	192	if (offset < 0)
ed79b86d	193	return sizeof(struct pt_regs);
1da177e4 LT	194	else if (offset <= 324) / gr[0..31] */
	195	return offset * 2 + 4;
	196	else if (offset <= 324+328) /* gr[0..31] + fr[0..31] */
	197	return offset + 32*4;
	198	else if (offset < sizeof(struct pt_regs)/2 + 32*4)
	199	return offset * 2 + 4 - 32*8;
	200	else
ed79b86d	201	return sizeof(struct pt_regs);
1da177e4	202	}
1da177e4	203
81e192d6 HD	204	long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
81e192d6 HD	205	compat_ulong_t addr, compat_ulong_t data)
1da177e4	206	{
81e192d6 HD	207	compat_uint_t tmp;
81e192d6 HD	208	long ret = -EIO;
1da177e4	209
1da177e4	210	switch (request) {
1da177e4	211
81e192d6 HD	212	case PTRACE_PEEKUSR:
	213	if (addr & (sizeof(compat_uint_t)-1))
	214	break;
	215	addr = translate_usr_offset(addr);
ed79b86d	216	if (addr >= sizeof(struct pt_regs))
81e192d6	217	break;
1da177e4	218
81e192d6 HD	219	tmp = (compat_uint_t ) ((char *) task_regs(child) + addr);
	220	ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
	221	break;
1da177e4 LT	222
	223	/* Write the word at location addr in the USER area. This will need
	224	to change when the kernel no longer saves all regs on a syscall.
	225	FIXME. There is a problem at the moment in that r3-r18 are only
	226	saved if the process is ptraced on syscall entry, and even then
	227	those values are overwritten by actual register values on syscall
	228	exit. */
	229	case PTRACE_POKEUSR:
1da177e4 LT	230	/* Some register values written here may be ignored in
	231	* entry.S:syscall_restore_rfi; e.g. iaoq is written with
	232	* r31/r31+4, and not with the values in pt_regs.
	233	*/
1da177e4	234	if (addr == PT_PSW) {
81e192d6 HD	235	/* Since PT_PSW==0, it is valid for 32 bit processes
81e192d6 HD	236	* under 64 bit kernels as well.
1da177e4	237	*/
81e192d6 HD	238	ret = arch_ptrace(child, request, addr, data);
	239	} else {
	240	if (addr & (sizeof(compat_uint_t)-1))
	241	break;
	242	addr = translate_usr_offset(addr);
ed79b86d	243	if (addr >= sizeof(struct pt_regs))
81e192d6	244	break;
1da177e4 LT	245	if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
1da177e4 LT	246	/* Special case, fp regs are 64 bits anyway */
81e192d6	247	(__u64 ) ((char *) task_regs(child) + addr) = data;
1da177e4 LT	248	ret = 0;
	249	}
	250	else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) \|\|
	251	addr == PT_IAOQ0+4 \|\| addr == PT_IAOQ1+4 \|\|
	252	addr == PT_SAR+4) {
	253	/* Zero the top 32 bits */
81e192d6 HD	254	(__u32 ) ((char *) task_regs(child) + addr - 4) = 0;
81e192d6 HD	255	(__u32 ) ((char *) task_regs(child) + addr) = data;
1da177e4 LT	256	ret = 0;
1da177e4 LT	257	}
1da177e4	258	}
81e192d6	259	break;
1da177e4 LT	260
1da177e4 LT	261	default:
81e192d6 HD	262	ret = compat_ptrace_request(child, request, addr, data);
81e192d6 HD	263	break;
1da177e4 LT	264	}
1da177e4 LT	265
1da177e4 LT	266	return ret;
1da177e4 LT	267	}
81e192d6 HD	268	#endif
81e192d6 HD	269
2798af1a KM	270	long do_syscall_trace_enter(struct pt_regs *regs)
2798af1a KM	271	{
c90f0694	272	/* Do the secure computing check first. */
fe5c8734	273	secure_computing_strict(regs->gr[20]);
c90f0694	274
2798af1a	275	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
98e8b6c9 HD	276	tracehook_report_syscall_entry(regs)) {
	277	/*
	278	* Tracing decided this syscall should not happen or the
	279	* debugger stored an invalid system call number. Skip
	280	* the system call and the system call restart handling.
	281	*/
	282	regs->gr[20] = -1UL;
	283	goto out;
	284	}
527973c8 HD	285
	286	#ifdef CONFIG_64BIT
	287	if (!is_compat_task())
91397401 EP	288	audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
91397401 EP	289	regs->gr[24], regs->gr[23]);
527973c8 HD	290	else
527973c8 HD	291	#endif
91397401	292	audit_syscall_entry(regs->gr[20] & 0xffffffff,
527973c8 HD	293	regs->gr[26] & 0xffffffff,
	294	regs->gr[25] & 0xffffffff,
	295	regs->gr[24] & 0xffffffff,
	296	regs->gr[23] & 0xffffffff);
	297
98e8b6c9 HD	298	out:
98e8b6c9 HD	299	return regs->gr[20];
2798af1a	300	}
1da177e4	301
2798af1a	302	void do_syscall_trace_exit(struct pt_regs *regs)
1da177e4	303	{
ecd3d4bc KM	304	int stepping = test_thread_flag(TIF_SINGLESTEP) \|\|
ecd3d4bc KM	305	test_thread_flag(TIF_BLOCKSTEP);
d6b58772	306
527973c8 HD	307	audit_syscall_exit(regs);
527973c8 HD	308
2798af1a KM	309	if (stepping \|\| test_thread_flag(TIF_SYSCALL_TRACE))
2798af1a KM	310	tracehook_report_syscall_exit(regs, stepping);
1da177e4	311	}