[mirror_ubuntu-hirsute-kernel.git] / arch / sh / kernel / ptrace_32.c

/*
 * linux/arch/sh/kernel/ptrace.c
 *
 * Original x86 implementation:
 *	By Ross Biro 1/23/92
 *	edited by Linus Torvalds
 *
 * SuperH version:   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
 * Audit support: Yuichi Nakamura <ynakam@hitachisoft.jp>
 */
#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/user.h>
#include <linux/slab.h>
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/io.h>
#include <linux/audit.h>
#include <linux/seccomp.h>
#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>

/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */

/*
 * This routine will get a word off of the process kernel stack.
 */
static inline int get_stack_long(struct task_struct *task, int offset)
{
	unsigned char *stack;

	stack = (unsigned char *)task_pt_regs(task);
	stack += offset;
	return (*((int *)stack));
}

/*
 * This routine will put a word on the process kernel stack.
 */
static inline int put_stack_long(struct task_struct *task, int offset,
				 unsigned long data)
{
	unsigned char *stack;

	stack = (unsigned char *)task_pt_regs(task);
	stack += offset;
	*(unsigned long *) stack = data;
	return 0;
}

void user_enable_single_step(struct task_struct *child)
{
	struct pt_regs *regs = task_pt_regs(child);
	long pc;

	pc = get_stack_long(child, (long)&regs->pc);

	/* Next scheduling will set up UBC */
	if (child->thread.ubc_pc == 0)
		ubc_usercnt += 1;

	child->thread.ubc_pc = pc;

	set_tsk_thread_flag(child, TIF_SINGLESTEP);
}

void user_disable_single_step(struct task_struct *child)
{
	clear_tsk_thread_flag(child, TIF_SINGLESTEP);

	/*
	 * Ensure the UBC is not programmed at the next context switch.
	 *
	 * Normally this is not needed but there are sequences such as
	 * singlestep, signal delivery, and continue that leave the
	 * ubc_pc non-zero leading to spurious SIGTRAPs.
	 */
	if (child->thread.ubc_pc != 0) {
		ubc_usercnt -= 1;
		child->thread.ubc_pc = 0;
	}
}

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure single step bits etc are not set.
 */
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)
{
	struct user * dummy = NULL;
	int ret;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR: {
		unsigned long tmp;

		ret = -EIO;
		if ((addr & 3) || addr < 0 ||
		    addr > sizeof(struct user) - 3)
			break;

		if (addr < sizeof(struct pt_regs))
			tmp = get_stack_long(child, addr);
		else if (addr >= (long) &dummy->fpu &&
			 addr < (long) &dummy->u_fpvalid) {
			if (!tsk_used_math(child)) {
				if (addr == (long)&dummy->fpu.fpscr)
					tmp = FPSCR_INIT;
				else
					tmp = 0;
			} else
				tmp = ((long *)&child->thread.fpu)
					[(addr - (long)&dummy->fpu) >> 2];
		} else if (addr == (long) &dummy->u_fpvalid)
			tmp = !!tsk_used_math(child);
		else
			tmp = 0;
		ret = put_user(tmp, (unsigned long __user *)data);
		break;
	}

	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
		ret = -EIO;
		if ((addr & 3) || addr < 0 ||
		    addr > sizeof(struct user) - 3)
			break;

		if (addr < sizeof(struct pt_regs))
			ret = put_stack_long(child, addr, data);
		else if (addr >= (long) &dummy->fpu &&
			 addr < (long) &dummy->u_fpvalid) {
			set_stopped_child_used_math(child);
			((long *)&child->thread.fpu)
				[(addr - (long)&dummy->fpu) >> 2] = data;
			ret = 0;
		} else if (addr == (long) &dummy->u_fpvalid) {
			conditional_stopped_child_used_math(data, child);
			ret = 0;
		}
		break;

#ifdef CONFIG_SH_DSP
	case PTRACE_GETDSPREGS: {
		unsigned long dp;

		ret = -EIO;
		dp = ((unsigned long) child) + THREAD_SIZE -
			 sizeof(struct pt_dspregs);
		if (*((int *) (dp - 4)) == SR_FD) {
			copy_to_user((void *)addr, (void *) dp,
				sizeof(struct pt_dspregs));
			ret = 0;
		}
		break;
	}

	case PTRACE_SETDSPREGS: {
		unsigned long dp;

		ret = -EIO;
		dp = ((unsigned long) child) + THREAD_SIZE -
			 sizeof(struct pt_dspregs);
		if (*((int *) (dp - 4)) == SR_FD) {
			copy_from_user((void *) dp, (void *)addr,
				sizeof(struct pt_dspregs));
			ret = 0;
		}
		break;
	}
#endif
#ifdef CONFIG_BINFMT_ELF_FDPIC
	case PTRACE_GETFDPIC: {
		unsigned long tmp = 0;

		switch (addr) {
		case PTRACE_GETFDPIC_EXEC:
			tmp = child->mm->context.exec_fdpic_loadmap;
			break;
		case PTRACE_GETFDPIC_INTERP:
			tmp = child->mm->context.interp_fdpic_loadmap;
			break;
		default:
			break;
		}

		ret = 0;
		if (put_user(tmp, (unsigned long *) data)) {
			ret = -EFAULT;
			break;
		}
		break;
	}
#endif
	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

static inline int audit_arch(void)
{
	int arch = EM_SH;

#ifdef CONFIG_CPU_LITTLE_ENDIAN
	arch |= __AUDIT_ARCH_LE;
#endif

	return arch;
}

asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
{
	long ret = 0;

	secure_computing(regs->regs[0]);

	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	    tracehook_report_syscall_entry(regs))
		/*
		 * Tracing decided this syscall should not happen.
		 * We'll return a bogus call number to get an ENOSYS
		 * error, but leave the original number in regs->regs[0].
		 */
		ret = -1L;

	if (unlikely(current->audit_context))
		audit_syscall_entry(audit_arch(), regs->regs[3],
				    regs->regs[4], regs->regs[5],
				    regs->regs[6], regs->regs[7]);

	return ret ?: regs->regs[0];
}

asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
	int step;

	if (unlikely(current->audit_context))
		audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
				   regs->regs[0]);

	step = test_thread_flag(TIF_SINGLESTEP);
	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(regs, step);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/sh/kernel/ptrace.c
	3	*
	4	* Original x86 implementation:
	5	* By Ross Biro 1/23/92
	6	* edited by Linus Torvalds
	7	*
	8	* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
1322b9de	9	* Audit support: Yuichi Nakamura <ynakam@hitachisoft.jp>
1da177e4	10	*/
1da177e4 LT	11	#include <linux/kernel.h>
	12	#include <linux/sched.h>
	13	#include <linux/mm.h>
	14	#include <linux/smp.h>
1da177e4 LT	15	#include <linux/errno.h>
	16	#include <linux/ptrace.h>
	17	#include <linux/user.h>
	18	#include <linux/slab.h>
	19	#include <linux/security.h>
7ed20e1a	20	#include <linux/signal.h>
9432f968	21	#include <linux/io.h>
1322b9de	22	#include <linux/audit.h>
c4637d47	23	#include <linux/seccomp.h>
ab99c733	24	#include <linux/tracehook.h>
1da177e4 LT	25	#include <asm/uaccess.h>
	26	#include <asm/pgtable.h>
	27	#include <asm/system.h>
	28	#include <asm/processor.h>
	29	#include <asm/mmu_context.h>
	30
	31	/*
	32	* does not yet catch signals sent when the child dies.
	33	* in exit.c or in signal.c.
	34	*/
	35
	36	/*
	37	* This routine will get a word off of the process kernel stack.
	38	*/
	39	static inline int get_stack_long(struct task_struct *task, int offset)
	40	{
	41	unsigned char *stack;
	42
3cf0f4ec	43	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	44	stack += offset;
	45	return (((int )stack));
	46	}
	47
	48	/*
	49	* This routine will put a word on the process kernel stack.
	50	*/
	51	static inline int put_stack_long(struct task_struct *task, int offset,
	52	unsigned long data)
	53	{
	54	unsigned char *stack;
	55
3cf0f4ec	56	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	57	stack += offset;
	58	(unsigned long ) stack = data;
	59	return 0;
	60	}
	61
c459dbf2 PM	62	void user_enable_single_step(struct task_struct *child)
	63	{
	64	struct pt_regs *regs = task_pt_regs(child);
	65	long pc;
	66
	67	pc = get_stack_long(child, (long)&regs->pc);
	68
	69	/* Next scheduling will set up UBC */
	70	if (child->thread.ubc_pc == 0)
	71	ubc_usercnt += 1;
	72
	73	child->thread.ubc_pc = pc;
	74
	75	set_tsk_thread_flag(child, TIF_SINGLESTEP);
	76	}
	77
	78	void user_disable_single_step(struct task_struct *child)
9432f968 SM	79	{
	80	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	81
	82	/*
	83	* Ensure the UBC is not programmed at the next context switch.
	84	*
	85	* Normally this is not needed but there are sequences such as
	86	* singlestep, signal delivery, and continue that leave the
	87	* ubc_pc non-zero leading to spurious SIGTRAPs.
	88	*/
	89	if (child->thread.ubc_pc != 0) {
	90	ubc_usercnt -= 1;
	91	child->thread.ubc_pc = 0;
	92	}
	93	}
	94
1da177e4 LT	95	/*
	96	* Called by kernel/ptrace.c when detaching..
	97	*
	98	* Make sure single step bits etc are not set.
	99	*/
	100	void ptrace_disable(struct task_struct *child)
	101	{
c459dbf2	102	user_disable_single_step(child);
1da177e4 LT	103	}
1da177e4 LT	104
481bed45	105	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	106	{
1da177e4 LT	107	struct user * dummy = NULL;
	108	int ret;
	109
1da177e4	110	switch (request) {
1da177e4 LT	111	/* read the word at location addr in the USER area. */
	112	case PTRACE_PEEKUSR: {
	113	unsigned long tmp;
	114
	115	ret = -EIO;
9432f968	116	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	117	addr > sizeof(struct user) - 3)
	118	break;
	119
	120	if (addr < sizeof(struct pt_regs))
	121	tmp = get_stack_long(child, addr);
	122	else if (addr >= (long) &dummy->fpu &&
	123	addr < (long) &dummy->u_fpvalid) {
	124	if (!tsk_used_math(child)) {
	125	if (addr == (long)&dummy->fpu.fpscr)
	126	tmp = FPSCR_INIT;
	127	else
	128	tmp = 0;
	129	} else
	130	tmp = ((long *)&child->thread.fpu)
	131	[(addr - (long)&dummy->fpu) >> 2];
	132	} else if (addr == (long) &dummy->u_fpvalid)
	133	tmp = !!tsk_used_math(child);
	134	else
	135	tmp = 0;
e08f457c	136	ret = put_user(tmp, (unsigned long __user *)data);
1da177e4 LT	137	break;
	138	}
	139
1da177e4 LT	140	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
1da177e4 LT	141	ret = -EIO;
9432f968	142	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	143	addr > sizeof(struct user) - 3)
	144	break;
	145
	146	if (addr < sizeof(struct pt_regs))
	147	ret = put_stack_long(child, addr, data);
	148	else if (addr >= (long) &dummy->fpu &&
	149	addr < (long) &dummy->u_fpvalid) {
	150	set_stopped_child_used_math(child);
	151	((long *)&child->thread.fpu)
	152	[(addr - (long)&dummy->fpu) >> 2] = data;
	153	ret = 0;
	154	} else if (addr == (long) &dummy->u_fpvalid) {
	155	conditional_stopped_child_used_math(data, child);
	156	ret = 0;
	157	}
	158	break;
	159
1da177e4 LT	160	#ifdef CONFIG_SH_DSP
	161	case PTRACE_GETDSPREGS: {
	162	unsigned long dp;
	163
	164	ret = -EIO;
	165	dp = ((unsigned long) child) + THREAD_SIZE -
	166	sizeof(struct pt_dspregs);
	167	if (((int ) (dp - 4)) == SR_FD) {
09061850	168	copy_to_user((void )addr, (void ) dp,
1da177e4 LT	169	sizeof(struct pt_dspregs));
	170	ret = 0;
	171	}
	172	break;
	173	}
	174
	175	case PTRACE_SETDSPREGS: {
	176	unsigned long dp;
1da177e4 LT	177
	178	ret = -EIO;
	179	dp = ((unsigned long) child) + THREAD_SIZE -
	180	sizeof(struct pt_dspregs);
	181	if (((int ) (dp - 4)) == SR_FD) {
09061850	182	copy_from_user((void ) dp, (void )addr,
1da177e4 LT	183	sizeof(struct pt_dspregs));
	184	ret = 0;
	185	}
	186	break;
	187	}
3bc24a1a PM	188	#endif
	189	#ifdef CONFIG_BINFMT_ELF_FDPIC
	190	case PTRACE_GETFDPIC: {
	191	unsigned long tmp = 0;
	192
	193	switch (addr) {
	194	case PTRACE_GETFDPIC_EXEC:
	195	tmp = child->mm->context.exec_fdpic_loadmap;
	196	break;
	197	case PTRACE_GETFDPIC_INTERP:
	198	tmp = child->mm->context.interp_fdpic_loadmap;
	199	break;
	200	default:
	201	break;
	202	}
	203
	204	ret = 0;
	205	if (put_user(tmp, (unsigned long *) data)) {
	206	ret = -EFAULT;
	207	break;
	208	}
	209	break;
	210	}
1da177e4 LT	211	#endif
	212	default:
	213	ret = ptrace_request(child, request, addr, data);
	214	break;
	215	}
481bed45	216
1da177e4 LT	217	return ret;
	218	}
	219
9e5e2117 PM	220	static inline int audit_arch(void)
	221	{
	222	int arch = EM_SH;
	223
	224	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	225	arch \|= __AUDIT_ARCH_LE;
	226	#endif
	227
	228	return arch;
	229	}
	230
ab99c733	231	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	232	{
ab99c733	233	long ret = 0;
1da177e4	234
c4637d47 PM	235	secure_computing(regs->regs[0]);
c4637d47 PM	236
ab99c733 PM	237	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	238	tracehook_report_syscall_entry(regs))
	239	/*
	240	* Tracing decided this syscall should not happen.
	241	* We'll return a bogus call number to get an ENOSYS
	242	* error, but leave the original number in regs->regs[0].
	243	*/
	244	ret = -1L;
1322b9de	245
ab99c733	246	if (unlikely(current->audit_context))
9e5e2117	247	audit_syscall_entry(audit_arch(), regs->regs[3],
1322b9de YN	248	regs->regs[4], regs->regs[5],
	249	regs->regs[6], regs->regs[7]);
	250
ab99c733 PM	251	return ret ?: regs->regs[0];
	252	}
	253
	254	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	255	{
	256	int step;
	257
	258	if (unlikely(current->audit_context))
	259	audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
	260	regs->regs[0]);
	261
	262	step = test_thread_flag(TIF_SINGLESTEP);
	263	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	264	tracehook_report_syscall_exit(regs, step);
1da177e4	265	}