[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/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/switch_to.h>

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

/* 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) * 2 + 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), FOLL_FORCE);
		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) {
			ret = ptrace_get_reg(child, index, &tmp);
			if (ret)
				break;
		} 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.fp_state.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);
			/* get 64 bit FPR */
			tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0];
		} else { /* register within PT_REGS struct */
			unsigned long tmp2;
			ret = ptrace_get_reg(child, numReg, &tmp2);
			if (ret)
				break;
			tmp = tmp2;
		} 
		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),
					FOLL_FORCE | FOLL_WRITE) == 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.fp_state.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;
			ret = ptrace_get_reg(child, numReg, &freg);
			if (ret)
				break;
			if (index % 2)
				freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
			else
				freg = (freg & 0xfffffffful) | (data << 32);
			ret = ptrace_put_reg(child, numReg, freg);
		} else {
			u64 *tmp;
			flush_fp_to_thread(child);
			/* get 64 bit FPR ... */
			tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0];
			/* ... write the 32 bit part we want */
			((u32 *)tmp)[index % 2] = data;
			ret = 0;
		}
		break;
	}

	case PTRACE_GET_DEBUGREG: {
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
		unsigned long dabr_fake;
#endif
		ret = -EINVAL;
		/* We only support one DABR and no IABRS at the moment */
		if (addr > 0)
			break;
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
		ret = put_user(child->thread.debug.dac1, (u32 __user *)data);
#else
		dabr_fake = (
			(child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
			(child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
		ret = put_user(dabr_fake, (u32 __user *)data);
#endif
		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 PTRACE_KILL:
	case PTRACE_SINGLESTEP:
	case PTRACE_DETACH:
	case PTRACE_SET_DEBUGREG:
	case PTRACE_SYSCALL:
	case PTRACE_CONT:
	case PPC_PTRACE_GETHWDBGINFO:
	case PPC_PTRACE_SETHWDEBUG:
	case PPC_PTRACE_DELHWDEBUG:
		ret = arch_ptrace(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>
1da177e4 LT	24	#include <linux/errno.h>
1da177e4 LT	25	#include <linux/ptrace.h>
0deef2c7	26	#include <linux/regset.h>
1da177e4 LT	27	#include <linux/user.h>
1da177e4 LT	28	#include <linux/security.h>
7ed20e1a	29	#include <linux/signal.h>
1d48d71c	30	#include <linux/compat.h>
1da177e4 LT	31
	32	#include <asm/uaccess.h>
	33	#include <asm/page.h>
	34	#include <asm/pgtable.h>
ae3a197e	35	#include <asm/switch_to.h>
21a62902	36
1da177e4 LT	37	/*
	38	* does not yet catch signals sent when the child dies.
	39	* in exit.c or in signal.c.
	40	*/
	41
9c75a31c MN	42	/* Macros to workout the correct index for the FPR in the thread struct */
	43	#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
	44	#define FPRHALF(i) (((i) - PT_FPR0) & 1)
bc826666	45	#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
9c75a31c	46
81e695c0 RM	47	long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
81e695c0 RM	48	compat_ulong_t caddr, compat_ulong_t cdata)
1da177e4	49	{
81e695c0 RM	50	unsigned long addr = caddr;
81e695c0 RM	51	unsigned long data = cdata;
6b9c7ed8	52	int ret;
1da177e4	53
1da177e4	54	switch (request) {
1da177e4 LT	55	/*
	56	* Read 4 bytes of the other process' storage
	57	* data is a pointer specifying where the user wants the
	58	* 4 bytes copied into
	59	* addr is a pointer in the user's storage that contains an 8 byte
	60	* address in the other process of the 4 bytes that is to be read
	61	* (this is run in a 32-bit process looking at a 64-bit process)
	62	* when I and D space are separate, these will need to be fixed.
	63	*/
	64	case PPC_PTRACE_PEEKTEXT_3264:
	65	case PPC_PTRACE_PEEKDATA_3264: {
	66	u32 tmp;
	67	int copied;
	68	u32 __user * addrOthers;
	69
	70	ret = -EIO;
	71
	72	/* Get the addr in the other process that we want to read */
	73	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
	74	break;
	75
	76	copied = access_process_vm(child, (u64)addrOthers, &tmp,
f307ab6d	77	sizeof(tmp), FOLL_FORCE);
1da177e4 LT	78	if (copied != sizeof(tmp))
	79	break;
	80	ret = put_user(tmp, (u32 __user *)data);
	81	break;
	82	}
	83
	84	/* Read a register (specified by ADDR) out of the "user area" */
	85	case PTRACE_PEEKUSR: {
	86	int index;
	87	unsigned long tmp;
	88
	89	ret = -EIO;
	90	/* convert to index and check */
	91	index = (unsigned long) addr >> 2;
	92	if ((addr & 3) \|\| (index > PT_FPSCR32))
	93	break;
	94
fabca2c0	95	CHECK_FULL_REGS(child->thread.regs);
1da177e4	96	if (index < PT_FPR0) {
ee4a3916 AK	97	ret = ptrace_get_reg(child, index, &tmp);
	98	if (ret)
	99	break;
1da177e4 LT	100	} else {
	101	flush_fp_to_thread(child);
	102	/*
	103	* the user space code considers the floating point
	104	* to be an array of unsigned int (32 bits) - the
	105	* index passed in is based on this assumption.
	106	*/
de79f7b9	107	tmp = ((unsigned int *)child->thread.fp_state.fpr)
9c75a31c	108	[FPRINDEX(index)];
1da177e4 LT	109	}
	110	ret = put_user((unsigned int)tmp, (u32 __user *)data);
	111	break;
	112	}
	113
	114	/*
	115	* Read 4 bytes out of the other process' pt_regs area
	116	* data is a pointer specifying where the user wants the
	117	* 4 bytes copied into
	118	* addr is the offset into the other process' pt_regs structure
	119	* that is to be read
	120	* (this is run in a 32-bit process looking at a 64-bit process)
	121	*/
	122	case PPC_PTRACE_PEEKUSR_3264: {
	123	u32 index;
	124	u32 reg32bits;
	125	u64 tmp;
	126	u32 numReg;
	127	u32 part;
	128
	129	ret = -EIO;
	130	/* Determine which register the user wants */
	131	index = (u64)addr >> 2;
	132	numReg = index / 2;
	133	/* Determine which part of the register the user wants */
	134	if (index % 2)
	135	part = 1; /* want the 2nd half of the register (right-most). */
	136	else
	137	part = 0; /* want the 1st half of the register (left-most). */
	138
912000e7 BH	139	/* Validate the input - check to see if address is on the wrong boundary
	140	* or beyond the end of the user area
	141	*/
1da177e4 LT	142	if ((addr & 3) \|\| numReg > PT_FPSCR)
	143	break;
	144
fabca2c0	145	CHECK_FULL_REGS(child->thread.regs);
1da177e4 LT	146	if (numReg >= PT_FPR0) {
1da177e4 LT	147	flush_fp_to_thread(child);
bc826666	148	/* get 64 bit FPR */
de79f7b9	149	tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0];
1da177e4	150	} else { /* register within PT_REGS struct */
ee4a3916 AK	151	unsigned long tmp2;
	152	ret = ptrace_get_reg(child, numReg, &tmp2);
	153	if (ret)
	154	break;
	155	tmp = tmp2;
1da177e4 LT	156	}
	157	reg32bits = ((u32*)&tmp)[part];
	158	ret = put_user(reg32bits, (u32 __user *)data);
	159	break;
	160	}
	161
1da177e4 LT	162	/*
	163	* Write 4 bytes into the other process' storage
	164	* data is the 4 bytes that the user wants written
	165	* addr is a pointer in the user's storage that contains an
	166	* 8 byte address in the other process where the 4 bytes
	167	* that is to be written
	168	* (this is run in a 32-bit process looking at a 64-bit process)
	169	* when I and D space are separate, these will need to be fixed.
	170	*/
	171	case PPC_PTRACE_POKETEXT_3264:
	172	case PPC_PTRACE_POKEDATA_3264: {
	173	u32 tmp = data;
	174	u32 __user * addrOthers;
	175
	176	/* Get the addr in the other process that we want to write into */
	177	ret = -EIO;
	178	if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
	179	break;
	180	ret = 0;
	181	if (access_process_vm(child, (u64)addrOthers, &tmp,
f307ab6d LS	182	sizeof(tmp),
f307ab6d LS	183	FOLL_FORCE \| FOLL_WRITE) == sizeof(tmp))
1da177e4 LT	184	break;
	185	ret = -EIO;
	186	break;
	187	}
	188
	189	/* write the word at location addr in the USER area */
	190	case PTRACE_POKEUSR: {
	191	unsigned long index;
	192
	193	ret = -EIO;
	194	/* convert to index and check */
	195	index = (unsigned long) addr >> 2;
	196	if ((addr & 3) \|\| (index > PT_FPSCR32))
	197	break;
	198
fabca2c0	199	CHECK_FULL_REGS(child->thread.regs);
1da177e4	200	if (index < PT_FPR0) {
865418d8	201	ret = ptrace_put_reg(child, index, data);
1da177e4 LT	202	} else {
	203	flush_fp_to_thread(child);
	204	/*
	205	* the user space code considers the floating point
	206	* to be an array of unsigned int (32 bits) - the
	207	* index passed in is based on this assumption.
	208	*/
de79f7b9	209	((unsigned int *)child->thread.fp_state.fpr)
9c75a31c	210	[FPRINDEX(index)] = data;
1da177e4 LT	211	ret = 0;
	212	}
	213	break;
	214	}
	215
	216	/*
	217	* Write 4 bytes into the other process' pt_regs area
	218	* data is the 4 bytes that the user wants written
	219	* addr is the offset into the other process' pt_regs structure
	220	* that is to be written into
	221	* (this is run in a 32-bit process looking at a 64-bit process)
	222	*/
	223	case PPC_PTRACE_POKEUSR_3264: {
	224	u32 index;
	225	u32 numReg;
	226
	227	ret = -EIO;
	228	/* Determine which register the user wants */
	229	index = (u64)addr >> 2;
	230	numReg = index / 2;
912000e7	231
1da177e4 LT	232	/*
	233	* Validate the input - check to see if address is on the
	234	* wrong boundary or beyond the end of the user area
	235	*/
	236	if ((addr & 3) \|\| (numReg > PT_FPSCR))
	237	break;
fabca2c0	238	CHECK_FULL_REGS(child->thread.regs);
912000e7	239	if (numReg < PT_FPR0) {
ee4a3916 AK	240	unsigned long freg;
	241	ret = ptrace_get_reg(child, numReg, &freg);
	242	if (ret)
	243	break;
912000e7 BH	244	if (index % 2)
	245	freg = (freg & ~0xfffffffful) \| (data & 0xfffffffful);
	246	else
	247	freg = (freg & 0xfffffffful) \| (data << 32);
	248	ret = ptrace_put_reg(child, numReg, freg);
	249	} else {
bc826666	250	u64 *tmp;
1da177e4	251	flush_fp_to_thread(child);
bc826666	252	/* get 64 bit FPR ... */
de79f7b9	253	tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0];
bc826666 MN	254	/* ... write the 32 bit part we want */
bc826666 MN	255	((u32 *)tmp)[index % 2] = data;
912000e7	256	ret = 0;
1da177e4	257	}
1da177e4 LT	258	break;
	259	}
	260
fd9648df	261	case PTRACE_GET_DEBUGREG: {
9422de3e MN	262	#ifndef CONFIG_PPC_ADV_DEBUG_REGS
	263	unsigned long dabr_fake;
	264	#endif
fd9648df AB	265	ret = -EINVAL;
	266	/* We only support one DABR and no IABRS at the moment */
	267	if (addr > 0)
	268	break;
bb2c458b	269	#ifdef CONFIG_PPC_ADV_DEBUG_REGS
51ae8d4a	270	ret = put_user(child->thread.debug.dac1, (u32 __user *)data);
bb2c458b	271	#else
9422de3e MN	272	dabr_fake = (
	273	(child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) \|
	274	(child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
	275	ret = put_user(dabr_fake, (u32 __user *)data);
bb2c458b	276	#endif
fd9648df AB	277	break;
	278	}
	279
0deef2c7 RM	280	case PTRACE_GETREGS: /* Get all pt_regs from the child. */
	281	return copy_regset_to_user(
	282	child, task_user_regset_view(current), 0,
	283	0, PT_REGS_COUNT * sizeof(compat_long_t),
	284	compat_ptr(data));
	285
	286	case PTRACE_SETREGS: /* Set all gp regs in the child. */
	287	return copy_regset_from_user(
	288	child, task_user_regset_view(current), 0,
	289	0, PT_REGS_COUNT * sizeof(compat_long_t),
	290	compat_ptr(data));
1da177e4	291
e17666ba BH	292	case PTRACE_GETFPREGS:
e17666ba BH	293	case PTRACE_SETFPREGS:
962bca7f	294	case PTRACE_GETVRREGS:
e17666ba	295	case PTRACE_SETVRREGS:
33b3f03d MN	296	case PTRACE_GETVSRREGS:
33b3f03d MN	297	case PTRACE_SETVSRREGS:
e17666ba BH	298	case PTRACE_GETREGS64:
e17666ba BH	299	case PTRACE_SETREGS64:
e17666ba BH	300	case PTRACE_KILL:
	301	case PTRACE_SINGLESTEP:
	302	case PTRACE_DETACH:
	303	case PTRACE_SET_DEBUGREG:
	304	case PTRACE_SYSCALL:
	305	case PTRACE_CONT:
bb2c458b AS	306	case PPC_PTRACE_GETHWDBGINFO:
	307	case PPC_PTRACE_SETHWDEBUG:
	308	case PPC_PTRACE_DELHWDEBUG:
e17666ba	309	ret = arch_ptrace(child, request, addr, data);
962bca7f RJ	310	break;
962bca7f RJ	311
1da177e4	312	default:
1d48d71c	313	ret = compat_ptrace_request(child, request, addr, data);
1da177e4 LT	314	break;
1da177e4 LT	315	}
81e695c0	316
1da177e4 LT	317	return ret;
1da177e4 LT	318	}