Logo Search packages:      
Sourcecode: linux version File versions

ptrace.c

/* ptrace.c: Sparc process tracing support.
 *
 * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *
 * 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/seccomp.h>
#include <linux/audit.h>
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/compat.h>
#include <linux/elf.h>

#include <asm/asi.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/psrcompat.h>
#include <asm/visasm.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/cpudata.h>
#include <asm/cacheflush.h>

#include "entry.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 */
}

/* To get the necessary page struct, access_process_vm() first calls
 * get_user_pages().  This has done a flush_dcache_page() on the
 * accessed page.  Then our caller (copy_{to,from}_user_page()) did
 * to memcpy to read/write the data from that page.
 *
 * Now, the only thing we have to do is:
 * 1) flush the D-cache if it's possible than an illegal alias
 *    has been created
 * 2) flush the I-cache if this is pre-cheetah and we did a write
 */
void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
                   unsigned long uaddr, void *kaddr,
                   unsigned long len, int write)
{
      BUG_ON(len > PAGE_SIZE);

      if (tlb_type == hypervisor)
            return;

      preempt_disable();

#ifdef DCACHE_ALIASING_POSSIBLE
      /* If bit 13 of the kernel address we used to access the
       * user page is the same as the virtual address that page
       * is mapped to in the user's address space, we can skip the
       * D-cache flush.
       */
      if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
            unsigned long start = __pa(kaddr);
            unsigned long end = start + len;
            unsigned long dcache_line_size;

            dcache_line_size = local_cpu_data().dcache_line_size;

            if (tlb_type == spitfire) {
                  for (; start < end; start += dcache_line_size)
                        spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
            } else {
                  start &= ~(dcache_line_size - 1);
                  for (; start < end; start += dcache_line_size)
                        __asm__ __volatile__(
                              "stxa %%g0, [%0] %1\n\t"
                              "membar #Sync"
                              : /* no outputs */
                              : "r" (start),
                              "i" (ASI_DCACHE_INVALIDATE));
            }
      }
#endif
      if (write && tlb_type == spitfire) {
            unsigned long start = (unsigned long) kaddr;
            unsigned long end = start + len;
            unsigned long icache_line_size;

            icache_line_size = local_cpu_data().icache_line_size;

            for (; start < end; start += icache_line_size)
                  flushi(start);
      }

      preempt_enable();
}

static int get_from_target(struct task_struct *target, unsigned long uaddr,
                     void *kbuf, int len)
{
      if (target == current) {
            if (copy_from_user(kbuf, (void __user *) uaddr, len))
                  return -EFAULT;
      } else {
            int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
            if (len2 != len)
                  return -EFAULT;
      }
      return 0;
}

static int set_to_target(struct task_struct *target, unsigned long uaddr,
                   void *kbuf, int len)
{
      if (target == current) {
            if (copy_to_user((void __user *) uaddr, kbuf, len))
                  return -EFAULT;
      } else {
            int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
            if (len2 != len)
                  return -EFAULT;
      }
      return 0;
}

static int regwindow64_get(struct task_struct *target,
                     const struct pt_regs *regs,
                     struct reg_window *wbuf)
{
      unsigned long rw_addr = regs->u_regs[UREG_I6];

      if (test_tsk_thread_flag(current, TIF_32BIT)) {
            struct reg_window32 win32;
            int i;

            if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
                  return -EFAULT;
            for (i = 0; i < 8; i++)
                  wbuf->locals[i] = win32.locals[i];
            for (i = 0; i < 8; i++)
                  wbuf->ins[i] = win32.ins[i];
      } else {
            rw_addr += STACK_BIAS;
            if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
                  return -EFAULT;
      }

      return 0;
}

static int regwindow64_set(struct task_struct *target,
                     const struct pt_regs *regs,
                     struct reg_window *wbuf)
{
      unsigned long rw_addr = regs->u_regs[UREG_I6];

      if (test_tsk_thread_flag(current, TIF_32BIT)) {
            struct reg_window32 win32;
            int i;

            for (i = 0; i < 8; i++)
                  win32.locals[i] = wbuf->locals[i];
            for (i = 0; i < 8; i++)
                  win32.ins[i] = wbuf->ins[i];

            if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
                  return -EFAULT;
      } else {
            rw_addr += STACK_BIAS;
            if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
                  return -EFAULT;
      }

      return 0;
}

enum sparc_regset {
      REGSET_GENERAL,
      REGSET_FP,
};

static int genregs64_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 = task_pt_regs(target);
      int ret;

      if (target == current)
            flushw_user();

      ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                          regs->u_regs,
                          0, 16 * sizeof(u64));
      if (!ret && count && pos < (32 * sizeof(u64))) {
            struct reg_window window;

            if (regwindow64_get(target, regs, &window))
                  return -EFAULT;
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &window,
                                16 * sizeof(u64),
                                32 * sizeof(u64));
      }

      if (!ret) {
            /* TSTATE, TPC, TNPC */
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &regs->tstate,
                                32 * sizeof(u64),
                                35 * sizeof(u64));
      }

      if (!ret) {
            unsigned long y = regs->y;

            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &y,
                                35 * sizeof(u64),
                                36 * sizeof(u64));
      }

      if (!ret) {
            ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                     36 * sizeof(u64), -1);

      }
      return ret;
}

static int genregs64_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 = task_pt_regs(target);
      int ret;

      if (target == current)
            flushw_user();

      ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                         regs->u_regs,
                         0, 16 * sizeof(u64));
      if (!ret && count && pos < (32 * sizeof(u64))) {
            struct reg_window window;

            if (regwindow64_get(target, regs, &window))
                  return -EFAULT;

            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &window,
                               16 * sizeof(u64),
                               32 * sizeof(u64));

            if (!ret &&
                regwindow64_set(target, regs, &window))
                  return -EFAULT;
      }

      if (!ret && count > 0) {
            unsigned long tstate;

            /* TSTATE */
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &tstate,
                               32 * sizeof(u64),
                               33 * sizeof(u64));
            if (!ret) {
                  /* Only the condition codes and the "in syscall"
                   * state can be modified in the %tstate register.
                   */
                  tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
                  regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
                  regs->tstate |= tstate;
            }
      }

      if (!ret) {
            /* TPC, TNPC */
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &regs->tpc,
                               33 * sizeof(u64),
                               35 * sizeof(u64));
      }

      if (!ret) {
            unsigned long y;

            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &y,
                               35 * sizeof(u64),
                               36 * sizeof(u64));
            if (!ret)
                  regs->y = y;
      }

      if (!ret)
            ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                                    36 * sizeof(u64), -1);

      return ret;
}

static int fpregs64_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 = task_thread_info(target)->fpregs;
      unsigned long fprs, fsr, gsr;
      int ret;

      if (target == current)
            save_and_clear_fpu();

      fprs = task_thread_info(target)->fpsaved[0];

      if (fprs & FPRS_DL)
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                fpregs,
                                0, 16 * sizeof(u64));
      else
            ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                     0,
                                     16 * sizeof(u64));

      if (!ret) {
            if (fprs & FPRS_DU)
                  ret = user_regset_copyout(&pos, &count,
                                      &kbuf, &ubuf,
                                      fpregs + 16,
                                      16 * sizeof(u64),
                                      32 * sizeof(u64));
            else
                  ret = user_regset_copyout_zero(&pos, &count,
                                           &kbuf, &ubuf,
                                           16 * sizeof(u64),
                                           32 * sizeof(u64));
      }

      if (fprs & FPRS_FEF) {
            fsr = task_thread_info(target)->xfsr[0];
            gsr = task_thread_info(target)->gsr[0];
      } else {
            fsr = gsr = 0;
      }

      if (!ret)
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &fsr,
                                32 * sizeof(u64),
                                33 * sizeof(u64));
      if (!ret)
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &gsr,
                                33 * sizeof(u64),
                                34 * sizeof(u64));
      if (!ret)
            ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                &fprs,
                                34 * sizeof(u64),
                                35 * sizeof(u64));

      if (!ret)
            ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
                                     35 * sizeof(u64), -1);

      return ret;
}

static int fpregs64_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 = task_thread_info(target)->fpregs;
      unsigned long fprs;
      int ret;

      if (target == current)
            save_and_clear_fpu();

      ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                         fpregs,
                         0, 32 * sizeof(u64));
      if (!ret)
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               task_thread_info(target)->xfsr,
                               32 * sizeof(u64),
                               33 * sizeof(u64));
      if (!ret)
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               task_thread_info(target)->gsr,
                               33 * sizeof(u64),
                               34 * sizeof(u64));

      fprs = task_thread_info(target)->fpsaved[0];
      if (!ret && count > 0) {
            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &fprs,
                               34 * sizeof(u64),
                               35 * sizeof(u64));
      }

      fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
      task_thread_info(target)->fpsaved[0] = fprs;

      if (!ret)
            ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
                                    35 * sizeof(u64), -1);
      return ret;
}

static const struct user_regset sparc64_regsets[] = {
      /* Format is:
       *    G0 --> G7
       *    O0 --> O7
       *    L0 --> L7
       *    I0 --> I7
       *    TSTATE, TPC, TNPC, Y
       */
      [REGSET_GENERAL] = {
            .core_note_type = NT_PRSTATUS,
            .n = 36 * sizeof(u64),
            .size = sizeof(u64), .align = sizeof(u64),
            .get = genregs64_get, .set = genregs64_set
      },
      /* Format is:
       *    F0 --> F63
       *    FSR
       *    GSR
       *    FPRS
       */
      [REGSET_FP] = {
            .core_note_type = NT_PRFPREG,
            .n = 35 * sizeof(u64),
            .size = sizeof(u64), .align = sizeof(u64),
            .get = fpregs64_get, .set = fpregs64_set
      },
};

static const struct user_regset_view user_sparc64_view = {
      .name = "sparc64", .e_machine = EM_SPARCV9,
      .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
};

#ifdef CONFIG_COMPAT
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 = task_pt_regs(target);
      compat_ulong_t __user *reg_window;
      compat_ulong_t *k = kbuf;
      compat_ulong_t __user *u = ubuf;
      compat_ulong_t reg;

      if (target == current)
            flushw_user();

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

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

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

            reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
            if (target == current) {
                  for (; count > 0 && pos < 32; count--) {
                        if (get_user(reg, &reg_window[pos++]) ||
                            put_user(reg, u++))
                              return -EFAULT;
                  }
            } else {
                  for (; count > 0 && pos < 32; count--) {
                        if (access_process_vm(target,
                                          (unsigned long)
                                          &reg_window[pos],
                                          &reg, sizeof(reg), 0)
                            != sizeof(reg))
                              return -EFAULT;
                        if (access_process_vm(target,
                                          (unsigned long) u,
                                          &reg, sizeof(reg), 1)
                            != sizeof(reg))
                              return -EFAULT;
                        pos++;
                        u++;
                  }
            }
      }
      while (count > 0) {
            switch (pos) {
            case 32: /* PSR */
                  reg = tstate_to_psr(regs->tstate);
                  break;
            case 33: /* PC */
                  reg = regs->tpc;
                  break;
            case 34: /* NPC */
                  reg = regs->tnpc;
                  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 = task_pt_regs(target);
      compat_ulong_t __user *reg_window;
      const compat_ulong_t *k = kbuf;
      const compat_ulong_t __user *u = ubuf;
      compat_ulong_t reg;

      if (target == current)
            flushw_user();

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

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

            reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
            if (target == current) {
                  for (; count > 0 && pos < 32; count--) {
                        if (put_user(*k++, &reg_window[pos++]))
                              return -EFAULT;
                  }
            } else {
                  for (; count > 0 && pos < 32; count--) {
                        if (access_process_vm(target,
                                          (unsigned long)
                                          &reg_window[pos],
                                          (void *) k,
                                          sizeof(*k), 1)
                            != sizeof(*k))
                              return -EFAULT;
                        k++;
                        pos++;
                  }
            }
      } else {
            for (; count > 0 && pos < 16; count--) {
                  if (get_user(reg, u++))
                        return -EFAULT;
                  regs->u_regs[pos++] = reg;
            }

            reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
            if (target == current) {
                  for (; count > 0 && pos < 32; count--) {
                        if (get_user(reg, u++) ||
                            put_user(reg, &reg_window[pos++]))
                              return -EFAULT;
                  }
            } else {
                  for (; count > 0 && pos < 32; count--) {
                        if (access_process_vm(target,
                                          (unsigned long)
                                          u,
                                          &reg, sizeof(reg), 0)
                            != sizeof(reg))
                              return -EFAULT;
                        if (access_process_vm(target,
                                          (unsigned long)
                                          &reg_window[pos],
                                          &reg, sizeof(reg), 1)
                            != sizeof(reg))
                              return -EFAULT;
                        pos++;
                        u++;
                  }
            }
      }
      while (count > 0) {
            unsigned long tstate;

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

            switch (pos) {
            case 32: /* PSR */
                  tstate = regs->tstate;
                  tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
                  tstate |= psr_to_tstate_icc(reg);
                  if (reg & PSR_SYSCALL)
                        tstate |= TSTATE_SYSCALL;
                  regs->tstate = tstate;
                  break;
            case 33: /* PC */
                  regs->tpc = reg;
                  break;
            case 34: /* NPC */
                  regs->tnpc = 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 = task_thread_info(target)->fpregs;
      compat_ulong_t enabled;
      unsigned long fprs;
      compat_ulong_t fsr;
      int ret = 0;

      if (target == current)
            save_and_clear_fpu();

      fprs = task_thread_info(target)->fpsaved[0];
      if (fprs & FPRS_FEF) {
            fsr = task_thread_info(target)->xfsr[0];
            enabled = 1;
      } else {
            fsr = 0;
            enabled = 0;
      }

      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,
                                &fsr,
                                33 * sizeof(u32),
                                34 * sizeof(u32));

      if (!ret) {
            compat_ulong_t val;

            val = (enabled << 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 = task_thread_info(target)->fpregs;
      unsigned long fprs;
      int ret;

      if (target == current)
            save_and_clear_fpu();

      fprs = task_thread_info(target)->fpsaved[0];

      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) {
            compat_ulong_t fsr;
            unsigned long val;

            ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                               &fsr,
                               33 * sizeof(u32),
                               34 * sizeof(u32));
            if (!ret) {
                  val = task_thread_info(target)->xfsr[0];
                  val &= 0xffffffff00000000UL;
                  val |= fsr;
                  task_thread_info(target)->xfsr[0] = val;
            }
      }

      fprs |= (FPRS_FEF | FPRS_DL);
      task_thread_info(target)->fpsaved[0] = fprs;

      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 * sizeof(u32),
            .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 * sizeof(u32),
            .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)
};
#endif /* CONFIG_COMPAT */

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
#ifdef CONFIG_COMPAT
      if (test_tsk_thread_flag(task, TIF_32BIT))
            return &user_sparc32_view;
#endif
      return &user_sparc64_view;
}

#ifdef CONFIG_COMPAT
struct compat_fps {
      unsigned int regs[32];
      unsigned int fsr;
      unsigned int flags;
      unsigned int extra;
      unsigned int fpqd;
      struct compat_fq {
            unsigned int insnaddr;
            unsigned int insn;
      } fpq[16];
};

long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                  compat_ulong_t caddr, compat_ulong_t cdata)
{
      const struct user_regset_view *view = task_user_regset_view(current);
      compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
      struct pt_regs32 __user *pregs;
      struct compat_fps __user *fps;
      unsigned long addr2 = caddr2;
      unsigned long addr = caddr;
      unsigned long data = cdata;
      int ret;

      pregs = (struct pt_regs32 __user *) addr;
      fps = (struct compat_fps __user *) addr;

      switch (request) {
      case PTRACE_PEEKUSR:
            ret = (addr != 0) ? -EIO : 0;
            break;

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

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

      case PTRACE_GETFPREGS:
            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->flags) ||
                      __put_user(0, &fps->extra) ||
                      __put_user(0, &fps->fpqd) ||
                      clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
                        ret = -EFAULT;
            }
            break;

      case PTRACE_SETFPREGS:
            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,
                              (char __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, (char __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 = compat_ptrace_request(child, request, addr, data);
            break;
      }

      return ret;
}
#endif /* CONFIG_COMPAT */

struct fps {
      unsigned int regs[64];
      unsigned long fsr;
};

long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
      const struct user_regset_view *view = task_user_regset_view(current);
      unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
      struct pt_regs __user *pregs;
      struct fps __user *fps;
      int ret;

      pregs = (struct pt_regs __user *) (unsigned long) addr;
      fps = (struct fps __user *) (unsigned long) addr;

      switch (request) {
      case PTRACE_PEEKUSR:
            ret = (addr != 0) ? -EIO : 0;
            break;

      case PTRACE_GETREGS64:
            ret = copy_regset_to_user(child, view, REGSET_GENERAL,
                                1 * sizeof(u64),
                                15 * sizeof(u64),
                                &pregs->u_regs[0]);
            if (!ret) {
                  /* XXX doesn't handle 'y' register correctly XXX */
                  ret = copy_regset_to_user(child, view, REGSET_GENERAL,
                                      32 * sizeof(u64),
                                      4 * sizeof(u64),
                                      &pregs->tstate);
            }
            break;

      case PTRACE_SETREGS64:
            ret = copy_regset_from_user(child, view, REGSET_GENERAL,
                                  1 * sizeof(u64),
                                  15 * sizeof(u64),
                                  &pregs->u_regs[0]);
            if (!ret) {
                  /* XXX doesn't handle 'y' register correctly XXX */
                  ret = copy_regset_from_user(child, view, REGSET_GENERAL,
                                        32 * sizeof(u64),
                                        4 * sizeof(u64),
                                        &pregs->tstate);
            }
            break;

      case PTRACE_GETFPREGS64:
            ret = copy_regset_to_user(child, view, REGSET_FP,
                                0 * sizeof(u64),
                                33 * sizeof(u64),
                                fps);
            break;

      case PTRACE_SETFPREGS64:
            ret = copy_regset_to_user(child, view, REGSET_FP,
                                0 * sizeof(u64),
                                33 * sizeof(u64),
                                fps);
            break;

      case PTRACE_READTEXT:
      case PTRACE_READDATA:
            ret = ptrace_readdata(child, addr,
                              (char __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, (char __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;

      /* do the secure computing check first */
      secure_computing(regs->u_regs[UREG_G1]);

      if (unlikely(current->audit_context) && syscall_exit_p) {
            unsigned long tstate = regs->tstate;
            int result = AUDITSC_SUCCESS;

            if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
                  result = AUDITSC_FAILURE;

            audit_syscall_exit(result, regs->u_regs[UREG_I0]);
      }

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

      if (unlikely(current->audit_context) && !syscall_exit_p && !ret)
            audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
                             AUDIT_ARCH_SPARC :
                             AUDIT_ARCH_SPARC64),
                            regs->u_regs[UREG_G1],
                            regs->u_regs[UREG_I0],
                            regs->u_regs[UREG_I1],
                            regs->u_regs[UREG_I2],
                            regs->u_regs[UREG_I3]);

      return ret;
}

Generated by  Doxygen 1.6.0   Back to index