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ptrace.c

/* ptrace.c: Sparc process tracing support.
 *
 * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
 *
 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
 * and David Mosberger.
 *
 * Added Linux support -miguel (weird, eh?, the original code was meant
 * to emulate SunOS).
 */

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

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

/* #define ALLOW_INIT_TRACING */

/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure single step bits etc are not set.
 */
void ptrace_disable(struct task_struct *child)
{
      /* nothing to do */
}

enum sparc_regset {
      REGSET_GENERAL,
      REGSET_FP,
};

static int genregs32_get(struct task_struct *target,
                   const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   void *kbuf, void __user *ubuf)
{
      const struct pt_regs *regs = target->thread.kregs;
      unsigned long __user *reg_window;
      unsigned long *k = kbuf;
      unsigned long __user *u = ubuf;
      unsigned long reg;

      if (target == current)
            flush_user_windows();

      pos /= sizeof(reg);
      count /= sizeof(reg);

      if (kbuf) {
            for (; count > 0 && pos < 16; count--)
                  *k++ = regs->u_regs[pos++];

            reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
            for (; count > 0 && pos < 32; count--) {
                  if (get_user(*k++, &reg_window[pos++]))
                        return -EFAULT;
            }
      } else {
            for (; count > 0 && pos < 16; count--) {
                  if (put_user(regs->u_regs[pos++], u++))
                        return -EFAULT;
            }

            reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
            for (; count > 0 && pos < 32; count--) {
                  if (get_user(reg, &reg_window[pos++]) ||
                      put_user(reg, u++))
                        return -EFAULT;
            }
      }
      while (count > 0) {
            switch (pos) {
            case 32: /* PSR */
                  reg = regs->psr;
                  break;
            case 33: /* PC */
                  reg = regs->pc;
                  break;
            case 34: /* NPC */
                  reg = regs->npc;
                  break;
            case 35: /* Y */
                  reg = regs->y;
                  break;
            case 36: /* WIM */
            case 37: /* TBR */
                  reg = 0;
                  break;
            default:
                  goto finish;
            }

            if (kbuf)
                  *k++ = reg;
            else if (put_user(reg, u++))
                  return -EFAULT;
            pos++;
            count--;
      }
finish:
      pos *= sizeof(reg);
      count *= sizeof(reg);

      return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                              38 * sizeof(reg), -1);
}

static int genregs32_set(struct task_struct *target,
                   const struct user_regset *regset,
                   unsigned int pos, unsigned int count,
                   const void *kbuf, const void __user *ubuf)
{
      struct pt_regs *regs = target->thread.kregs;
      unsigned long __user *reg_window;
      const unsigned long *k = kbuf;
      const unsigned long __user *u = ubuf;
      unsigned long reg;

      if (target == current)
            flush_user_windows();

      pos /= sizeof(reg);
      count /= sizeof(reg);

      if (kbuf) {
            for (; count > 0 && pos < 16; count--)
                  regs->u_regs[pos++] = *k++;

            reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
            for (; count > 0 && pos < 32; count--) {
                  if (put_user(*k++, &reg_window[pos++]))
                        return -EFAULT;
            }
      } else {
            for (; count > 0 && pos < 16; count--) {
                  if (get_user(reg, u++))
                        return -EFAULT;
                  regs->u_regs[pos++] = reg;
            }

            reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
            for (; count > 0 && pos < 32; count--) {
                  if (get_user(reg, u++) ||
                      put_user(reg, &reg_window[pos++]))
                        return -EFAULT;
            }
      }
      while (count > 0) {
            unsigned long psr;

            if (kbuf)
                  reg = *k++;
            else if (get_user(reg, u++))
                  return -EFAULT;

            switch (pos) {
            case 32: /* PSR */
                  psr = regs->psr;
                  psr &= ~(PSR_ICC | PSR_SYSCALL);
                  psr |= (reg & (PSR_ICC | PSR_SYSCALL));
                  regs->psr = psr;
                  break;
            case 33: /* PC */
                  regs->pc = reg;
                  break;
            case 34: /* NPC */
                  regs->npc = reg;
                  break;
            case 35: /* Y */
                  regs->y = reg;
                  break;
            case 36: /* WIM */
            case 37: /* TBR */
                  break;
            default:
                  goto finish;
            }

            pos++;
            count--;
      }
finish:
      pos *= sizeof(reg);
      count *= sizeof(reg);

      return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                               38 * sizeof(reg), -1);
}

static int fpregs32_get(struct task_struct *target,
                  const struct user_regset *regset,
                  unsigned int pos, unsigned int count,
                  void *kbuf, void __user *ubuf)
{
      const unsigned long *fpregs = target->thread.float_regs;
      int ret = 0;

#if 0
      if (target == current)
            save_and_clear_fpu();
#endif

      ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                          fpregs,
                          0, 32 * sizeof(u32));

      if (!ret)
            ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                     32 * sizeof(u32),
                                     33 * sizeof(u32));
      if (!ret)
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &target->thread.fsr,
                                33 * sizeof(u32),
                                34 * sizeof(u32));

      if (!ret) {
            unsigned long val;

            val = (1 << 8) | (8 << 16);
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &val,
                                34 * sizeof(u32),
                                35 * sizeof(u32));
      }

      if (!ret)
            ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                     35 * sizeof(u32), -1);

      return ret;
}

static int fpregs32_set(struct task_struct *target,
                  const struct user_regset *regset,
                  unsigned int pos, unsigned int count,
                  const void *kbuf, const void __user *ubuf)
{
      unsigned long *fpregs = target->thread.float_regs;
      int ret;

#if 0
      if (target == current)
            save_and_clear_fpu();
#endif
      ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                         fpregs,
                         0, 32 * sizeof(u32));
      if (!ret)
            user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                                32 * sizeof(u32),
                                33 * sizeof(u32));
      if (!ret && count > 0) {
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &target->thread.fsr,
                               33 * sizeof(u32),
                               34 * sizeof(u32));
      }

      if (!ret)
            ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                                    34 * sizeof(u32), -1);
      return ret;
}

static const struct user_regset sparc32_regsets[] = {
      /* Format is:
       *    G0 --> G7
       *    O0 --> O7
       *    L0 --> L7
       *    I0 --> I7
       *    PSR, PC, nPC, Y, WIM, TBR
       */
      [REGSET_GENERAL] = {
            .core_note_type = NT_PRSTATUS,
            .n = 38,
            .size = sizeof(u32), .align = sizeof(u32),
            .get = genregs32_get, .set = genregs32_set
      },
      /* Format is:
       *    F0 --> F31
       *    empty 32-bit word
       *    FSR (32--bit word)
       *    FPU QUEUE COUNT (8-bit char)
       *    FPU QUEUE ENTRYSIZE (8-bit char)
       *    FPU ENABLED (8-bit char)
       *    empty 8-bit char
       *    FPU QUEUE (64 32-bit ints)
       */
      [REGSET_FP] = {
            .core_note_type = NT_PRFPREG,
            .n = 99,
            .size = sizeof(u32), .align = sizeof(u32),
            .get = fpregs32_get, .set = fpregs32_set
      },
};

static const struct user_regset_view user_sparc32_view = {
      .name = "sparc", .e_machine = EM_SPARC,
      .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
      return &user_sparc32_view;
}

long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
      unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
      const struct user_regset_view *view;
      int ret;

      view = task_user_regset_view(current);

      switch(request) {
      case PTRACE_GETREGS: {
            struct pt_regs __user *pregs = (struct pt_regs __user *) addr;

            ret = copy_regset_to_user(child, view, REGSET_GENERAL,
                                32 * sizeof(u32),
                                4 * sizeof(u32),
                                &pregs->psr);
            if (!ret)
                  copy_regset_to_user(child, view, REGSET_GENERAL,
                                  1 * sizeof(u32),
                                  15 * sizeof(u32),
                                  &pregs->u_regs[0]);
            break;
      }

      case PTRACE_SETREGS: {
            struct pt_regs __user *pregs = (struct pt_regs __user *) addr;

            ret = copy_regset_from_user(child, view, REGSET_GENERAL,
                                  32 * sizeof(u32),
                                  4 * sizeof(u32),
                                  &pregs->psr);
            if (!ret)
                  copy_regset_from_user(child, view, REGSET_GENERAL,
                                    1 * sizeof(u32),
                                    15 * sizeof(u32),
                                    &pregs->u_regs[0]);
            break;
      }

      case PTRACE_GETFPREGS: {
            struct fps {
                  unsigned long regs[32];
                  unsigned long fsr;
                  unsigned long flags;
                  unsigned long extra;
                  unsigned long fpqd;
                  struct fq {
                        unsigned long *insnaddr;
                        unsigned long insn;
                  } fpq[16];
            };
            struct fps __user *fps = (struct fps __user *) addr;

            ret = copy_regset_to_user(child, view, REGSET_FP,
                                0 * sizeof(u32),
                                32 * sizeof(u32),
                                &fps->regs[0]);
            if (!ret)
                  ret = copy_regset_to_user(child, view, REGSET_FP,
                                      33 * sizeof(u32),
                                      1 * sizeof(u32),
                                      &fps->fsr);

            if (!ret) {
                  if (__put_user(0, &fps->fpqd) ||
                      __put_user(0, &fps->flags) ||
                      __put_user(0, &fps->extra) ||
                      clear_user(fps->fpq, sizeof(fps->fpq)))
                        ret = -EFAULT;
            }
            break;
      }

      case PTRACE_SETFPREGS: {
            struct fps {
                  unsigned long regs[32];
                  unsigned long fsr;
                  unsigned long flags;
                  unsigned long extra;
                  unsigned long fpqd;
                  struct fq {
                        unsigned long *insnaddr;
                        unsigned long insn;
                  } fpq[16];
            };
            struct fps __user *fps = (struct fps __user *) addr;

            ret = copy_regset_from_user(child, view, REGSET_FP,
                                  0 * sizeof(u32),
                                  32 * sizeof(u32),
                                  &fps->regs[0]);
            if (!ret)
                  ret = copy_regset_from_user(child, view, REGSET_FP,
                                        33 * sizeof(u32),
                                        1 * sizeof(u32),
                                        &fps->fsr);
            break;
      }

      case PTRACE_READTEXT:
      case PTRACE_READDATA:
            ret = ptrace_readdata(child, addr,
                              (void __user *) addr2, data);

            if (ret == data)
                  ret = 0;
            else if (ret >= 0)
                  ret = -EIO;
            break;

      case PTRACE_WRITETEXT:
      case PTRACE_WRITEDATA:
            ret = ptrace_writedata(child, (void __user *) addr2,
                               addr, data);

            if (ret == data)
                  ret = 0;
            else if (ret >= 0)
                  ret = -EIO;
            break;

      default:
            if (request == PTRACE_SPARC_DETACH)
                  request = PTRACE_DETACH;
            ret = ptrace_request(child, request, addr, data);
            break;
      }

      return ret;
}

asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
{
      int ret = 0;

      if (test_thread_flag(TIF_SYSCALL_TRACE)) {
            if (syscall_exit_p)
                  tracehook_report_syscall_exit(regs, 0);
            else
                  ret = tracehook_report_syscall_entry(regs);
      }

      return ret;
}

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