LXR linux/arch/sparc/kernel/sigutil

   1#include <linux/kernel.h>
   2#include <linux/types.h>
   3#include <linux/thread_info.h>
   4#include <linux/uaccess.h>
   5#include <linux/sched.h>
   6
   7#include <asm/sigcontext.h>
   8#include <asm/fpumacro.h>
   9#include <asm/ptrace.h>
  10#include <asm/switch_to.h>
  11
  12#include "sigutil.h"
  13
  14int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  15{
  16        int err = 0;
  17#ifdef CONFIG_SMP
  18        if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
  19                put_psr(get_psr() | PSR_EF);
  20                fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  21                       &current->thread.fpqueue[0], &current->thread.fpqdepth);
  22                regs->psr &= ~(PSR_EF);
  23                clear_tsk_thread_flag(current, TIF_USEDFPU);
  24        }
  25#else
  26        if (current == last_task_used_math) {
  27                put_psr(get_psr() | PSR_EF);
  28                fpsave(&current->thread.float_regs[0], &current->thread.fsr,
  29                       &current->thread.fpqueue[0], &current->thread.fpqdepth);
  30                last_task_used_math = NULL;
  31                regs->psr &= ~(PSR_EF);
  32        }
  33#endif
  34        err |= __copy_to_user(&fpu->si_float_regs[0],
  35                              &current->thread.float_regs[0],
  36                              (sizeof(unsigned long) * 32));
  37        err |= __put_user(current->thread.fsr, &fpu->si_fsr);
  38        err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  39        if (current->thread.fpqdepth != 0)
  40                err |= __copy_to_user(&fpu->si_fpqueue[0],
  41                                      &current->thread.fpqueue[0],
  42                                      ((sizeof(unsigned long) +
  43                                      (sizeof(unsigned long *)))*16));
  44        clear_used_math();
  45        return err;
  46}
  47
  48int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  49{
  50        int err;
  51
  52        if (((unsigned long) fpu) & 3)
  53                return -EFAULT;
  54
  55#ifdef CONFIG_SMP
  56        if (test_tsk_thread_flag(current, TIF_USEDFPU))
  57                regs->psr &= ~PSR_EF;
  58#else
  59        if (current == last_task_used_math) {
  60                last_task_used_math = NULL;
  61                regs->psr &= ~PSR_EF;
  62        }
  63#endif
  64        set_used_math();
  65        clear_tsk_thread_flag(current, TIF_USEDFPU);
  66
  67        if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  68                return -EFAULT;
  69
  70        err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
  71                               (sizeof(unsigned long) * 32));
  72        err |= __get_user(current->thread.fsr, &fpu->si_fsr);
  73        err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  74        if (current->thread.fpqdepth != 0)
  75                err |= __copy_from_user(&current->thread.fpqueue[0],
  76                                        &fpu->si_fpqueue[0],
  77                                        ((sizeof(unsigned long) +
  78                                        (sizeof(unsigned long *)))*16));
  79        return err;
  80}
  81
  82int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  83{
  84        int i, err = __put_user(wsaved, &rwin->wsaved);
  85
  86        for (i = 0; i < wsaved; i++) {
  87                struct reg_window32 *rp;
  88                unsigned long fp;
  89
  90                rp = &current_thread_info()->reg_window[i];
  91                fp = current_thread_info()->rwbuf_stkptrs[i];
  92                err |= copy_to_user(&rwin->reg_window[i], rp,
  93                                    sizeof(struct reg_window32));
  94                err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  95        }
  96        return err;
  97}
  98
  99int restore_rwin_state(__siginfo_rwin_t __user *rp)
 100{
 101        struct thread_info *t = current_thread_info();
 102        int i, wsaved, err;
 103
 104        if (((unsigned long) rp) & 3)
 105                return -EFAULT;
 106
 107        get_user(wsaved, &rp->wsaved);
 108        if (wsaved > NSWINS)
 109                return -EFAULT;
 110
 111        err = 0;
 112        for (i = 0; i < wsaved; i++) {
 113                err |= copy_from_user(&t->reg_window[i],
 114                                      &rp->reg_window[i],
 115                                      sizeof(struct reg_window32));
 116                err |= __get_user(t->rwbuf_stkptrs[i],
 117                                  &rp->rwbuf_stkptrs[i]);
 118        }
 119        if (err)
 120                return err;
 121
 122        t->w_saved = wsaved;
 123        synchronize_user_stack();
 124        if (t->w_saved)
 125                return -EFAULT;
 126        return 0;
 127
 128}
 129