-/*
- * 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/config.h>
-#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/user.h>
-#include <linux/security.h>
-#include <linux/signal.h>
-
-#include <asm/uaccess.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-
-#include "ptrace-common.h"
-
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
-
-long compat_sys_ptrace(int request, int pid, unsigned long addr,
- unsigned long data)
-{
- struct task_struct *child;
- int ret;
-
- lock_kernel();
- if (request == PTRACE_TRACEME) {
- ret = ptrace_traceme();
- goto out;
- }
-
- child = ptrace_get_task_struct(pid);
- if (IS_ERR(child)) {
- ret = PTR_ERR(child);
- goto out;
- }
-
- if (request == PTRACE_ATTACH) {
- ret = ptrace_attach(child);
- goto out_tsk;
- }
-
- ret = ptrace_check_attach(child, request == PTRACE_KILL);
- if (ret < 0)
- goto out_tsk;
-
- switch (request) {
- /* when I and D space are separate, these will need to be fixed. */
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA: {
- unsigned int tmp;
- int copied;
-
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- ret = -EIO;
- if (copied != sizeof(tmp))
- break;
- ret = put_user(tmp, (u32 __user *)data);
- break;
- }
-
- /*
- * 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;
-
- if (index < PT_FPR0) {
- tmp = 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)[index - PT_FPR0];
- }
- 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;
-
- if (numReg >= PT_FPR0) {
- flush_fp_to_thread(child);
- tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
- } else { /* register within PT_REGS struct */
- tmp = get_reg(child, numReg);
- }
- reg32bits = ((u32*)&tmp)[part];
- ret = put_user(reg32bits, (u32 __user *)data);
- break;
- }
-
- /* If I and D space are separate, this will have to be fixed. */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA: {
- unsigned int tmp;
- tmp = data;
- ret = 0;
- if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
- == sizeof(tmp))
- break;
- ret = -EIO;
- 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;
-
- if (index == PT_ORIG_R3)
- break;
- if (index < PT_FPR0) {
- ret = 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)[index - PT_FPR0] = 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;
- /* Insure it is a register we let them change */
- if ((numReg == PT_ORIG_R3)
- || ((numReg > PT_CCR) && (numReg < PT_FPR0)))
- break;
- if (numReg >= PT_FPR0) {
- flush_fp_to_thread(child);
- }
- if (numReg == PT_MSR)
- data = (data & MSR_DEBUGCHANGE)
- | (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
- ((u32*)child->thread.regs)[index] = data;
- ret = 0;
- break;
- }
-
- case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: { /* restart after signal. */
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- /* make sure the single step bit is not set. */
- clear_single_step(child);
- wake_up_process(child);
- ret = 0;
- break;
- }
-
- /*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- case PTRACE_KILL: {
- ret = 0;
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- break;
- child->exit_code = SIGKILL;
- /* make sure the single step bit is not set. */
- clear_single_step(child);
- wake_up_process(child);
- break;
- }
-
- case PTRACE_SINGLESTEP: { /* set the trap flag. */
- ret = -EIO;
- if (!valid_signal(data))
- break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- set_single_step(child);
- child->exit_code = data;
- /* give it a chance to run. */
- wake_up_process(child);
- 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_SET_DEBUGREG:
- ret = ptrace_set_debugreg(child, addr, data);
- break;
-
- case PTRACE_DETACH:
- ret = ptrace_detach(child, data);
- break;
-
- case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
- int i;
- unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
- unsigned int __user *tmp = (unsigned int __user *)addr;
-
- for (i = 0; i < 32; i++) {
- ret = put_user(*reg, tmp);
- if (ret)
- break;
- reg++;
- tmp++;
- }
- break;
- }
-
- case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
- int i;
- unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
- unsigned int __user *tmp = (unsigned int __user *)addr;
-
- for (i = 0; i < 32; i++) {
- ret = get_user(*reg, tmp);
- if (ret)
- break;
- reg++;
- tmp++;
- }
- break;
- }
-
- case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
- int i;
- unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
- unsigned int __user *tmp = (unsigned int __user *)addr;
-
- flush_fp_to_thread(child);
-
- for (i = 0; i < 32; i++) {
- ret = put_user(*reg, tmp);
- if (ret)
- break;
- reg++;
- tmp++;
- }
- break;
- }
-
- case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
- int i;
- unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
- unsigned int __user *tmp = (unsigned int __user *)addr;
-
- flush_fp_to_thread(child);
-
- for (i = 0; i < 32; i++) {
- ret = get_user(*reg, tmp);
- if (ret)
- break;
- reg++;
- tmp++;
- }
- break;
- }
-
- case PTRACE_GETEVENTMSG:
- ret = put_user(child->ptrace_message, (unsigned int __user *) data);
- break;
-
-#ifdef CONFIG_ALTIVEC
- case PTRACE_GETVRREGS:
- /* Get the child altivec register state. */
- flush_altivec_to_thread(child);
- ret = get_vrregs((unsigned long __user *)data, child);
- break;
-
- case PTRACE_SETVRREGS:
- /* Set the child altivec register state. */
- flush_altivec_to_thread(child);
- ret = set_vrregs(child, (unsigned long __user *)data);
- break;
-#endif
-
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-out_tsk:
- put_task_struct(child);
-out:
- unlock_kernel();
- return ret;
-}
git://git.onelab.eu / linux-2.6.git / blobdiff