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ptrace32.c

/*
 * 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.
 *
 * Copyright (C) 1992 Ross Biro
 * Copyright (C) Linus Torvalds
 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
 * Copyright (C) 1996 David S. Miller
 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999 MIPS Technologies, Inc.
 * Copyright (C) 2000 Ulf Carlsson
 *
 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
 * binaries.
 */
#include <linux/compiler.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/user.h>
#include <linux/security.h>

#include <asm/cpu.h>
#include <asm/dsp.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>

/*
 * Tracing a 32-bit process with a 64-bit strace and vice versa will not
 * work.  I don't know how to fix this.
 */
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                  compat_ulong_t caddr, compat_ulong_t cdata)
{
      int addr = caddr;
      int data = cdata;
      int ret;

      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, (unsigned int __user *) (unsigned long) 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 PTRACE_PEEKTEXT_3264:
      case 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 *) (unsigned long) 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 *) (unsigned long) data);
            break;
      }

      /* Read the word at location addr in the USER area. */
      case PTRACE_PEEKUSR: {
            struct pt_regs *regs;
            unsigned int tmp;

            regs = task_pt_regs(child);
            ret = 0;  /* Default return value. */

            switch (addr) {
            case 0 ... 31:
                  tmp = regs->regs[addr];
                  break;
            case FPR_BASE ... FPR_BASE + 31:
                  if (tsk_used_math(child)) {
                        fpureg_t *fregs = get_fpu_regs(child);

                        /*
                         * The odd registers are actually the high
                         * order bits of the values stored in the even
                         * registers - unless we're using r2k_switch.S.
                         */
                        if (addr & 1)
                              tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
                        else
                              tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
                  } else {
                        tmp = -1;   /* FP not yet used  */
                  }
                  break;
            case PC:
                  tmp = regs->cp0_epc;
                  break;
            case CAUSE:
                  tmp = regs->cp0_cause;
                  break;
            case BADVADDR:
                  tmp = regs->cp0_badvaddr;
                  break;
            case MMHI:
                  tmp = regs->hi;
                  break;
            case MMLO:
                  tmp = regs->lo;
                  break;
            case FPC_CSR:
                  tmp = child->thread.fpu.fcr31;
                  break;
            case FPC_EIR: {   /* implementation / version register */
                  unsigned int flags;
#ifdef CONFIG_MIPS_MT_SMTC
                  unsigned int irqflags;
                  unsigned int mtflags;
#endif /* CONFIG_MIPS_MT_SMTC */

                  preempt_disable();
                  if (!cpu_has_fpu) {
                        preempt_enable();
                        tmp = 0;
                        break;
                  }

#ifdef CONFIG_MIPS_MT_SMTC
                  /* Read-modify-write of Status must be atomic */
                  local_irq_save(irqflags);
                  mtflags = dmt();
#endif /* CONFIG_MIPS_MT_SMTC */

                  if (cpu_has_mipsmt) {
                        unsigned int vpflags = dvpe();
                        flags = read_c0_status();
                        __enable_fpu();
                        __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
                        write_c0_status(flags);
                        evpe(vpflags);
                  } else {
                        flags = read_c0_status();
                        __enable_fpu();
                        __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
                        write_c0_status(flags);
                  }
#ifdef CONFIG_MIPS_MT_SMTC
                  emt(mtflags);
                  local_irq_restore(irqflags);
#endif /* CONFIG_MIPS_MT_SMTC */
                  preempt_enable();
                  break;
            }
            case DSP_BASE ... DSP_BASE + 5: {
                  dspreg_t *dregs;

                  if (!cpu_has_dsp) {
                        tmp = 0;
                        ret = -EIO;
                        goto out;
                  }
                  dregs = __get_dsp_regs(child);
                  tmp = (unsigned long) (dregs[addr - DSP_BASE]);
                  break;
            }
            case DSP_CONTROL:
                  if (!cpu_has_dsp) {
                        tmp = 0;
                        ret = -EIO;
                        goto out;
                  }
                  tmp = child->thread.dsp.dspcontrol;
                  break;
            default:
                  tmp = 0;
                  ret = -EIO;
                  goto out;
            }
            ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
            break;
      }

      /* when I and D space are separate, this will have to be fixed. */
      case PTRACE_POKETEXT: /* write the word at location addr. */
      case PTRACE_POKEDATA:
            ret = 0;
            if (access_process_vm(child, addr, &data, sizeof(data), 1)
                == sizeof(data))
                  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 PTRACE_POKETEXT_3264:
      case PTRACE_POKEDATA_3264: {
            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 *) (unsigned long) addr) != 0)
                  break;
            ret = 0;
            if (access_process_vm(child, (u64)addrOthers, &data,
                              sizeof(data), 1) == sizeof(data))
                  break;
            ret = -EIO;
            break;
      }

      case PTRACE_POKEUSR: {
            struct pt_regs *regs;
            ret = 0;
            regs = task_pt_regs(child);

            switch (addr) {
            case 0 ... 31:
                  regs->regs[addr] = data;
                  break;
            case FPR_BASE ... FPR_BASE + 31: {
                  fpureg_t *fregs = get_fpu_regs(child);

                  if (!tsk_used_math(child)) {
                        /* FP not yet used  */
                        memset(&child->thread.fpu, ~0,
                               sizeof(child->thread.fpu));
                        child->thread.fpu.fcr31 = 0;
                  }
                  /*
                   * The odd registers are actually the high order bits
                   * of the values stored in the even registers - unless
                   * we're using r2k_switch.S.
                   */
                  if (addr & 1) {
                        fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
                        fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
                  } else {
                        fregs[addr - FPR_BASE] &= ~0xffffffffLL;
                        /* Must cast, lest sign extension fill upper
                           bits!  */
                        fregs[addr - FPR_BASE] |= (unsigned int)data;
                  }
                  break;
            }
            case PC:
                  regs->cp0_epc = data;
                  break;
            case MMHI:
                  regs->hi = data;
                  break;
            case MMLO:
                  regs->lo = data;
                  break;
            case FPC_CSR:
                  child->thread.fpu.fcr31 = data;
                  break;
            case DSP_BASE ... DSP_BASE + 5: {
                  dspreg_t *dregs;

                  if (!cpu_has_dsp) {
                        ret = -EIO;
                        break;
                  }

                  dregs = __get_dsp_regs(child);
                  dregs[addr - DSP_BASE] = data;
                  break;
            }
            case DSP_CONTROL:
                  if (!cpu_has_dsp) {
                        ret = -EIO;
                        break;
                  }
                  child->thread.dsp.dspcontrol = data;
                  break;
            default:
                  /* The rest are not allowed. */
                  ret = -EIO;
                  break;
            }
            break;
            }

      case PTRACE_GETREGS:
            ret = ptrace_getregs(child, (__s64 __user *) (__u64) data);
            break;

      case PTRACE_SETREGS:
            ret = ptrace_setregs(child, (__s64 __user *) (__u64) data);
            break;

      case PTRACE_GETFPREGS:
            ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
            break;

      case PTRACE_SETFPREGS:
            ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
            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;
            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;
            wake_up_process(child);
            break;

      case PTRACE_GET_THREAD_AREA:
            ret = put_user(task_thread_info(child)->tp_value,
                        (unsigned int __user *) (unsigned long) data);
            break;

      case PTRACE_DETACH: /* detach a process that was attached. */
            ret = ptrace_detach(child, data);
            break;

      case PTRACE_GETEVENTMSG:
            ret = put_user(child->ptrace_message,
                         (unsigned int __user *) (unsigned long) data);
            break;

      case PTRACE_GET_THREAD_AREA_3264:
            ret = put_user(task_thread_info(child)->tp_value,
                        (unsigned long __user *) (unsigned long) data);
            break;

      case PTRACE_GET_WATCH_REGS:
            ret = ptrace_get_watch_regs(child,
                  (struct pt_watch_regs __user *) (unsigned long) addr);
            break;

      case PTRACE_SET_WATCH_REGS:
            ret = ptrace_set_watch_regs(child,
                  (struct pt_watch_regs __user *) (unsigned long) addr);
            break;

      default:
            ret = ptrace_request(child, request, addr, data);
            break;
      }
out:
      return ret;
}

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