arch/powerpc/kernel/ptrace32.c - maze/linux - Git at Google

 /*
  * 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.
  */

 /*
  * 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) * 2 + FPRHALF(i)
 #define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0))

 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);
 			/* get 64 bit FPR */
 			tmp = ((u64 *)child->thread.fpr)
 				[FPRINDEX_3264(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 {
 			u64 *tmp;
 			flush_fp_to_thread(child);
 			/* get 64 bit FPR ... */
 			tmp = &(((u64 *)child->thread.fpr)
 				[FPRINDEX_3264(numReg)]);
 			/* ... write the 32 bit part we want */
 			((u32 *)tmp)[index % 2] = 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;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 		ret = put_user(child->thread.dac1, (u32 __user *)data);
 #else
 		ret = put_user(child->thread.dabr, (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 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:
 	case PPC_PTRACE_GETHWDBGINFO:
 	case PPC_PTRACE_SETHWDEBUG:
 	case PPC_PTRACE_DELHWDEBUG:
 		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;
 }
	/*
	* 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.
	*/

	/*
	* 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) * 2 + FPRHALF(i)
	#define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0))

	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);
	/* get 64 bit FPR */
	tmp = ((u64 *)child->thread.fpr)
	[FPRINDEX_3264(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 {
	u64 *tmp;
	flush_fp_to_thread(child);
	/* get 64 bit FPR ... */
	tmp = &(((u64 *)child->thread.fpr)
	[FPRINDEX_3264(numReg)]);
	/* ... write the 32 bit part we want */
	((u32 *)tmp)[index % 2] = 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;
	#ifdef CONFIG_PPC_ADV_DEBUG_REGS
	ret = put_user(child->thread.dac1, (u32 __user *)data);
	#else
	ret = put_user(child->thread.dabr, (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 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:
	case PPC_PTRACE_GETHWDBGINFO:
	case PPC_PTRACE_SETHWDEBUG:
	case PPC_PTRACE_DELHWDEBUG:
	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;
	}