[linux-2.6-block.git] / arch / powerpc / kernel / ptrace32.c

/*
 * ptrace for 32-bit processes running on a 64-bit kernel.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Derived from "arch/m68k/kernel/ptrace.c"
 *  Copyright (C) 1994 by Hamish Macdonald
 *  Taken from linux/kernel/ptrace.c and modified for M680x0.
 *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 *
 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
 * and Paul Mackerras (paulus@samba.org).
 *
 * 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.
 */

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

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

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

/*
 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
 * we mark them as obsolete now, they will be removed in a future version
 */
static long compat_ptrace_old(struct task_struct *child, long request,
			      long addr, long data)
{
	switch (request) {
	case PPC_PTRACE_GETREGS:	/* Get GPRs 0 - 31. */
		return copy_regset_to_user(child,
					   task_user_regset_view(current), 0,
					   0, 32 * sizeof(compat_long_t),
					   compat_ptr(data));

	case PPC_PTRACE_SETREGS:	/* Set GPRs 0 - 31. */
		return copy_regset_from_user(child,
					     task_user_regset_view(current), 0,
					     0, 32 * sizeof(compat_long_t),
					     compat_ptr(data));
	}

	return -EPERM;
}

/* Macros to workout the correct index for the FPR in the thread struct */
#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
#define FPRHALF(i) (((i) - PT_FPR0) & 1)
#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) + FPRHALF(i)

long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
			compat_ulong_t caddr, compat_ulong_t cdata)
{
	unsigned long addr = caddr;
	unsigned long data = cdata;
	int ret;

	switch (request) {
	/*
	 * Read 4 bytes of the other process' storage
	 *  data is a pointer specifying where the user wants the
	 *	4 bytes copied into
	 *  addr is a pointer in the user's storage that contains an 8 byte
	 *	address in the other process of the 4 bytes that is to be read
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 * when I and D space are separate, these will need to be fixed.
	 */
	case PPC_PTRACE_PEEKTEXT_3264:
	case PPC_PTRACE_PEEKDATA_3264: {
		u32 tmp;
		int copied;
		u32 __user * addrOthers;

		ret = -EIO;

		/* Get the addr in the other process that we want to read */
		if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
			break;

		copied = access_process_vm(child, (u64)addrOthers, &tmp,
				sizeof(tmp), 0);
		if (copied != sizeof(tmp))
			break;
		ret = put_user(tmp, (u32 __user *)data);
		break;
	}

	/* Read a register (specified by ADDR) out of the "user area" */
	case PTRACE_PEEKUSR: {
		int index;
		unsigned long tmp;

		ret = -EIO;
		/* convert to index and check */
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR32))
			break;

		CHECK_FULL_REGS(child->thread.regs);
		if (index < PT_FPR0) {
			tmp = ptrace_get_reg(child, index);
		} else {
			flush_fp_to_thread(child);
			/*
			 * the user space code considers the floating point
			 * to be an array of unsigned int (32 bits) - the
			 * index passed in is based on this assumption.
			 */
			tmp = ((unsigned int *)child->thread.fpr)
				[FPRINDEX(index)];
		}
		ret = put_user((unsigned int)tmp, (u32 __user *)data);
		break;
	}
  
	/*
	 * Read 4 bytes out of the other process' pt_regs area
	 *  data is a pointer specifying where the user wants the
	 *	4 bytes copied into
	 *  addr is the offset into the other process' pt_regs structure
	 *	that is to be read
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 */
	case PPC_PTRACE_PEEKUSR_3264: {
		u32 index;
		u32 reg32bits;
		u64 tmp;
		u32 numReg;
		u32 part;

		ret = -EIO;
		/* Determine which register the user wants */
		index = (u64)addr >> 2;
		numReg = index / 2;
		/* Determine which part of the register the user wants */
		if (index % 2)
			part = 1;  /* want the 2nd half of the register (right-most). */
		else
			part = 0;  /* want the 1st half of the register (left-most). */

		/* Validate the input - check to see if address is on the wrong boundary
		 * or beyond the end of the user area
		 */
		if ((addr & 3) || numReg > PT_FPSCR)
			break;

		CHECK_FULL_REGS(child->thread.regs);
		if (numReg >= PT_FPR0) {
			flush_fp_to_thread(child);
			tmp = ((unsigned long int *)child->thread.fpr)
				[FPRINDEX(numReg)];
		} else { /* register within PT_REGS struct */
			tmp = ptrace_get_reg(child, numReg);
		} 
		reg32bits = ((u32*)&tmp)[part];
		ret = put_user(reg32bits, (u32 __user *)data);
		break;
	}

	/*
	 * Write 4 bytes into the other process' storage
	 *  data is the 4 bytes that the user wants written
	 *  addr is a pointer in the user's storage that contains an
	 *	8 byte address in the other process where the 4 bytes
	 *	that is to be written
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 * when I and D space are separate, these will need to be fixed.
	 */
	case PPC_PTRACE_POKETEXT_3264:
	case PPC_PTRACE_POKEDATA_3264: {
		u32 tmp = data;
		u32 __user * addrOthers;

		/* Get the addr in the other process that we want to write into */
		ret = -EIO;
		if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
			break;
		ret = 0;
		if (access_process_vm(child, (u64)addrOthers, &tmp,
					sizeof(tmp), 1) == sizeof(tmp))
			break;
		ret = -EIO;
		break;
	}

	/* write the word at location addr in the USER area */
	case PTRACE_POKEUSR: {
		unsigned long index;

		ret = -EIO;
		/* convert to index and check */
		index = (unsigned long) addr >> 2;
		if ((addr & 3) || (index > PT_FPSCR32))
			break;

		CHECK_FULL_REGS(child->thread.regs);
		if (index < PT_FPR0) {
			ret = ptrace_put_reg(child, index, data);
		} else {
			flush_fp_to_thread(child);
			/*
			 * the user space code considers the floating point
			 * to be an array of unsigned int (32 bits) - the
			 * index passed in is based on this assumption.
			 */
			((unsigned int *)child->thread.fpr)
				[FPRINDEX(index)] = data;
			ret = 0;
		}
		break;
	}

	/*
	 * Write 4 bytes into the other process' pt_regs area
	 *  data is the 4 bytes that the user wants written
	 *  addr is the offset into the other process' pt_regs structure
	 *	that is to be written into
	 * (this is run in a 32-bit process looking at a 64-bit process)
	 */
	case PPC_PTRACE_POKEUSR_3264: {
		u32 index;
		u32 numReg;

		ret = -EIO;
		/* Determine which register the user wants */
		index = (u64)addr >> 2;
		numReg = index / 2;

		/*
		 * Validate the input - check to see if address is on the
		 * wrong boundary or beyond the end of the user area
		 */
		if ((addr & 3) || (numReg > PT_FPSCR))
			break;
		CHECK_FULL_REGS(child->thread.regs);
		if (numReg < PT_FPR0) {
			unsigned long freg = ptrace_get_reg(child, numReg);
			if (index % 2)
				freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
			else
				freg = (freg & 0xfffffffful) | (data << 32);
			ret = ptrace_put_reg(child, numReg, freg);
		} else {
			flush_fp_to_thread(child);
			((unsigned int *)child->thread.regs)[index] = data;
			ret = 0;
		}
		break;
	}

	case PTRACE_GET_DEBUGREG: {
		ret = -EINVAL;
		/* We only support one DABR and no IABRS at the moment */
		if (addr > 0)
			break;
		ret = put_user(child->thread.dabr, (u32 __user *)data);
		break;
	}

	case PTRACE_GETREGS:	/* Get all pt_regs from the child. */
		return copy_regset_to_user(
			child, task_user_regset_view(current), 0,
			0, PT_REGS_COUNT * sizeof(compat_long_t),
			compat_ptr(data));

	case PTRACE_SETREGS:	/* Set all gp regs in the child. */
		return copy_regset_from_user(
			child, task_user_regset_view(current), 0,
			0, PT_REGS_COUNT * sizeof(compat_long_t),
			compat_ptr(data));

	case PTRACE_GETFPREGS:
	case PTRACE_SETFPREGS:
	case PTRACE_GETVRREGS:
	case PTRACE_SETVRREGS:
	case PTRACE_GETVSRREGS:
	case PTRACE_SETVSRREGS:
	case PTRACE_GETREGS64:
	case PTRACE_SETREGS64:
	case PPC_PTRACE_GETFPREGS:
	case PPC_PTRACE_SETFPREGS:
	case PTRACE_KILL:
	case PTRACE_SINGLESTEP:
	case PTRACE_DETACH:
	case PTRACE_SET_DEBUGREG:
	case PTRACE_SYSCALL:
	case PTRACE_CONT:
		ret = arch_ptrace(child, request, addr, data);
		break;

	/* Old reverse args ptrace callss */
	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
		ret = compat_ptrace_old(child, request, addr, data);
		break;

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

	return ret;
}
Commit	Line	Data
1da177e4	1	/*
b123923d	2	* ptrace for 32-bit processes running on a 64-bit kernel.
1da177e4 LT	3	*
	4	* PowerPC version
	5	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	6	*
	7	* Derived from "arch/m68k/kernel/ptrace.c"
	8	* Copyright (C) 1994 by Hamish Macdonald
	9	* Taken from linux/kernel/ptrace.c and modified for M680x0.
	10	* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
	11	*
	12	* Modified by Cort Dougan (cort@hq.fsmlabs.com)
b123923d	13	* and Paul Mackerras (paulus@samba.org).
1da177e4 LT	14	*
1da177e4 LT	15	* This file is subject to the terms and conditions of the GNU General
b123923d	16	* Public License. See the file COPYING in the main directory of
1da177e4 LT	17	* this archive for more details.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/sched.h>
	22	#include <linux/mm.h>
	23	#include <linux/smp.h>
	24	#include <linux/smp_lock.h>
	25	#include <linux/errno.h>
	26	#include <linux/ptrace.h>
0deef2c7	27	#include <linux/regset.h>
1da177e4 LT	28	#include <linux/user.h>
1da177e4 LT	29	#include <linux/security.h>
7ed20e1a	30	#include <linux/signal.h>
1d48d71c	31	#include <linux/compat.h>
1da177e4 LT	32
	33	#include <asm/uaccess.h>
	34	#include <asm/page.h>
	35	#include <asm/pgtable.h>
	36	#include <asm/system.h>
21a62902	37
1da177e4 LT	38	/*
	39	* does not yet catch signals sent when the child dies.
	40	* in exit.c or in signal.c.
	41	*/
	42
e17666ba BH	43	/*
	44	* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
	45	* we mark them as obsolete now, they will be removed in a future version
	46	*/
	47	static long compat_ptrace_old(struct task_struct *child, long request,
	48	long addr, long data)
	49	{
0deef2c7 RM	50	switch (request) {
	51	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	52	return copy_regset_to_user(child,
	53	task_user_regset_view(current), 0,
	54	0, 32 * sizeof(compat_long_t),
	55	compat_ptr(data));
	56
	57	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	58	return copy_regset_from_user(child,
	59	task_user_regset_view(current), 0,
	60	0, 32 * sizeof(compat_long_t),
	61	compat_ptr(data));
e17666ba BH	62	}
e17666ba BH	63
0deef2c7	64	return -EPERM;
e17666ba BH	65	}
e17666ba BH	66
9c75a31c MN	67	/* Macros to workout the correct index for the FPR in the thread struct */
	68	#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
	69	#define FPRHALF(i) (((i) - PT_FPR0) & 1)
	70	#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) + FPRHALF(i)
	71
81e695c0 RM	72	long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
81e695c0 RM	73	compat_ulong_t caddr, compat_ulong_t cdata)
1da177e4	74	{
81e695c0 RM	75	unsigned long addr = caddr;
81e695c0 RM	76	unsigned long data = cdata;
6b9c7ed8	77	int ret;
1da177e4	78
1da177e4	79	switch (request) {
1da177e4 LT	80	/*
	81	* Read 4 bytes of the other process' storage
	82	* data is a pointer specifying where the user wants the
	83	* 4 bytes copied into
	84	* addr is a pointer in the user's storage that contains an 8 byte
	85	* address in the other process of the 4 bytes that is to be read
	86	* (this is run in a 32-bit process looking at a 64-bit process)
	87	* when I and D space are separate, these will need to be fixed.
	88	*/
	89	case PPC_PTRACE_PEEKTEXT_3264:
	90	case PPC_PTRACE_PEEKDATA_3264: {
	91	u32 tmp;
	92	int copied;
	93	u32 __user * addrOthers;
	94
	95	ret = -EIO;
	96
	97	/* Get the addr in the other process that we want to read */
	98	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
	99	break;
	100
	101	copied = access_process_vm(child, (u64)addrOthers, &tmp,
	102	sizeof(tmp), 0);
	103	if (copied != sizeof(tmp))
	104	break;
	105	ret = put_user(tmp, (u32 __user *)data);
	106	break;
	107	}
	108
	109	/* Read a register (specified by ADDR) out of the "user area" */
	110	case PTRACE_PEEKUSR: {
	111	int index;
	112	unsigned long tmp;
	113
	114	ret = -EIO;
	115	/* convert to index and check */
	116	index = (unsigned long) addr >> 2;
	117	if ((addr & 3) \|\| (index > PT_FPSCR32))
	118	break;
	119
fabca2c0	120	CHECK_FULL_REGS(child->thread.regs);
1da177e4	121	if (index < PT_FPR0) {
865418d8	122	tmp = ptrace_get_reg(child, index);
1da177e4 LT	123	} else {
	124	flush_fp_to_thread(child);
	125	/*
	126	* the user space code considers the floating point
	127	* to be an array of unsigned int (32 bits) - the
	128	* index passed in is based on this assumption.
	129	*/
9c75a31c MN	130	tmp = ((unsigned int *)child->thread.fpr)
9c75a31c MN	131	[FPRINDEX(index)];
1da177e4 LT	132	}
	133	ret = put_user((unsigned int)tmp, (u32 __user *)data);
	134	break;
	135	}
	136
	137	/*
	138	* Read 4 bytes out of the other process' pt_regs area
	139	* data is a pointer specifying where the user wants the
	140	* 4 bytes copied into
	141	* addr is the offset into the other process' pt_regs structure
	142	* that is to be read
	143	* (this is run in a 32-bit process looking at a 64-bit process)
	144	*/
	145	case PPC_PTRACE_PEEKUSR_3264: {
	146	u32 index;
	147	u32 reg32bits;
	148	u64 tmp;
	149	u32 numReg;
	150	u32 part;
	151
	152	ret = -EIO;
	153	/* Determine which register the user wants */
	154	index = (u64)addr >> 2;
	155	numReg = index / 2;
	156	/* Determine which part of the register the user wants */
	157	if (index % 2)
	158	part = 1; /* want the 2nd half of the register (right-most). */
	159	else
	160	part = 0; /* want the 1st half of the register (left-most). */
	161
912000e7 BH	162	/* Validate the input - check to see if address is on the wrong boundary
	163	* or beyond the end of the user area
	164	*/
1da177e4 LT	165	if ((addr & 3) \|\| numReg > PT_FPSCR)
	166	break;
	167
fabca2c0	168	CHECK_FULL_REGS(child->thread.regs);
1da177e4 LT	169	if (numReg >= PT_FPR0) {
1da177e4 LT	170	flush_fp_to_thread(child);
9c75a31c MN	171	tmp = ((unsigned long int *)child->thread.fpr)
9c75a31c MN	172	[FPRINDEX(numReg)];
1da177e4	173	} else { /* register within PT_REGS struct */
865418d8	174	tmp = ptrace_get_reg(child, numReg);
1da177e4 LT	175	}
	176	reg32bits = ((u32*)&tmp)[part];
	177	ret = put_user(reg32bits, (u32 __user *)data);
	178	break;
	179	}
	180
1da177e4 LT	181	/*
	182	* Write 4 bytes into the other process' storage
	183	* data is the 4 bytes that the user wants written
	184	* addr is a pointer in the user's storage that contains an
	185	* 8 byte address in the other process where the 4 bytes
	186	* that is to be written
	187	* (this is run in a 32-bit process looking at a 64-bit process)
	188	* when I and D space are separate, these will need to be fixed.
	189	*/
	190	case PPC_PTRACE_POKETEXT_3264:
	191	case PPC_PTRACE_POKEDATA_3264: {
	192	u32 tmp = data;
	193	u32 __user * addrOthers;
	194
	195	/* Get the addr in the other process that we want to write into */
	196	ret = -EIO;
	197	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
	198	break;
	199	ret = 0;
	200	if (access_process_vm(child, (u64)addrOthers, &tmp,
	201	sizeof(tmp), 1) == sizeof(tmp))
	202	break;
	203	ret = -EIO;
	204	break;
	205	}
	206
	207	/* write the word at location addr in the USER area */
	208	case PTRACE_POKEUSR: {
	209	unsigned long index;
	210
	211	ret = -EIO;
	212	/* convert to index and check */
	213	index = (unsigned long) addr >> 2;
	214	if ((addr & 3) \|\| (index > PT_FPSCR32))
	215	break;
	216
fabca2c0	217	CHECK_FULL_REGS(child->thread.regs);
1da177e4	218	if (index < PT_FPR0) {
865418d8	219	ret = ptrace_put_reg(child, index, data);
1da177e4 LT	220	} else {
	221	flush_fp_to_thread(child);
	222	/*
	223	* the user space code considers the floating point
	224	* to be an array of unsigned int (32 bits) - the
	225	* index passed in is based on this assumption.
	226	*/
9c75a31c MN	227	((unsigned int *)child->thread.fpr)
9c75a31c MN	228	[FPRINDEX(index)] = data;
1da177e4 LT	229	ret = 0;
	230	}
	231	break;
	232	}
	233
	234	/*
	235	* Write 4 bytes into the other process' pt_regs area
	236	* data is the 4 bytes that the user wants written
	237	* addr is the offset into the other process' pt_regs structure
	238	* that is to be written into
	239	* (this is run in a 32-bit process looking at a 64-bit process)
	240	*/
	241	case PPC_PTRACE_POKEUSR_3264: {
	242	u32 index;
	243	u32 numReg;
	244
	245	ret = -EIO;
	246	/* Determine which register the user wants */
	247	index = (u64)addr >> 2;
	248	numReg = index / 2;
912000e7	249
1da177e4 LT	250	/*
	251	* Validate the input - check to see if address is on the
	252	* wrong boundary or beyond the end of the user area
	253	*/
	254	if ((addr & 3) \|\| (numReg > PT_FPSCR))
	255	break;
fabca2c0	256	CHECK_FULL_REGS(child->thread.regs);
912000e7 BH	257	if (numReg < PT_FPR0) {
	258	unsigned long freg = ptrace_get_reg(child, numReg);
	259	if (index % 2)
	260	freg = (freg & ~0xfffffffful) \| (data & 0xfffffffful);
	261	else
	262	freg = (freg & 0xfffffffful) \| (data << 32);
	263	ret = ptrace_put_reg(child, numReg, freg);
	264	} else {
1da177e4	265	flush_fp_to_thread(child);
912000e7 BH	266	((unsigned int *)child->thread.regs)[index] = data;
912000e7 BH	267	ret = 0;
1da177e4	268	}
1da177e4 LT	269	break;
	270	}
	271
fd9648df AB	272	case PTRACE_GET_DEBUGREG: {
	273	ret = -EINVAL;
	274	/* We only support one DABR and no IABRS at the moment */
	275	if (addr > 0)
	276	break;
	277	ret = put_user(child->thread.dabr, (u32 __user *)data);
	278	break;
	279	}
	280
0deef2c7 RM	281	case PTRACE_GETREGS: /* Get all pt_regs from the child. */
	282	return copy_regset_to_user(
	283	child, task_user_regset_view(current), 0,
	284	0, PT_REGS_COUNT * sizeof(compat_long_t),
	285	compat_ptr(data));
	286
	287	case PTRACE_SETREGS: /* Set all gp regs in the child. */
	288	return copy_regset_from_user(
	289	child, task_user_regset_view(current), 0,
	290	0, PT_REGS_COUNT * sizeof(compat_long_t),
	291	compat_ptr(data));
1da177e4	292
e17666ba BH	293	case PTRACE_GETFPREGS:
e17666ba BH	294	case PTRACE_SETFPREGS:
962bca7f	295	case PTRACE_GETVRREGS:
e17666ba	296	case PTRACE_SETVRREGS:
33b3f03d MN	297	case PTRACE_GETVSRREGS:
33b3f03d MN	298	case PTRACE_SETVSRREGS:
e17666ba BH	299	case PTRACE_GETREGS64:
	300	case PTRACE_SETREGS64:
	301	case PPC_PTRACE_GETFPREGS:
	302	case PPC_PTRACE_SETFPREGS:
	303	case PTRACE_KILL:
	304	case PTRACE_SINGLESTEP:
	305	case PTRACE_DETACH:
	306	case PTRACE_SET_DEBUGREG:
	307	case PTRACE_SYSCALL:
	308	case PTRACE_CONT:
	309	ret = arch_ptrace(child, request, addr, data);
962bca7f RJ	310	break;
962bca7f RJ	311
e17666ba BH	312	/* Old reverse args ptrace callss */
	313	case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
	314	case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
	315	ret = compat_ptrace_old(child, request, addr, data);
962bca7f	316	break;
962bca7f	317
1da177e4	318	default:
1d48d71c	319	ret = compat_ptrace_request(child, request, addr, data);
1da177e4 LT	320	break;
1da177e4 LT	321	}
81e695c0	322
1da177e4 LT	323	return ret;
1da177e4 LT	324	}