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#ifdef CONFIG_SMP
  52        if (test_tsk_thread_flag(current, TIF_USEDFPU))
  53                regs->psr &= ~PSR_EF;
  54#else
  55        if (current == last_task_used_math) {
  56                last_task_used_math = NULL;
  57                regs->psr &= ~PSR_EF;
  58        }
  59#endif
  60        set_used_math();
  61        clear_tsk_thread_flag(current, TIF_USEDFPU);
  62
  63        if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  64                return -EFAULT;
  65
  66        err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
  67                               (sizeof(unsigned long) * 32));
  68        err |= __get_user(current->thread.fsr, &fpu->si_fsr);
  69        err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
  70        if (current->thread.fpqdepth != 0)
  71                err |= __copy_from_user(&current->thread.fpqueue[0],
  72                                        &fpu->si_fpqueue[0],
  73                                        ((sizeof(unsigned long) +
  74                                        (sizeof(unsigned long *)))*16));
  75        return err;
  76}
  77
  78int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  79{
  80        int i, err = __put_user(wsaved, &rwin->wsaved);
  81
  82        for (i = 0; i < wsaved; i++) {
  83                struct reg_window32 *rp;
  84                unsigned long fp;
  85
  86                rp = &current_thread_info()->reg_window[i];
  87                fp = current_thread_info()->rwbuf_stkptrs[i];
  88                err |= copy_to_user(&rwin->reg_window[i], rp,
  89                                    sizeof(struct reg_window32));
  90                err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  91        }
  92        return err;
  93}
  94
  95int restore_rwin_state(__siginfo_rwin_t __user *rp)
  96{
  97        struct thread_info *t = current_thread_info();
  98        int i, wsaved, err;
  99
 100        __get_user(wsaved, &rp->wsaved);
 101        if (wsaved > NSWINS)
 102                return -EFAULT;
 103
 104        err = 0;
 105        for (i = 0; i < wsaved; i++) {
 106                err |= copy_from_user(&t->reg_window[i],
 107                                      &rp->reg_window[i],
 108                                      sizeof(struct reg_window32));
 109                err |= __get_user(t->rwbuf_stkptrs[i],
 110                                  &rp->rwbuf_stkptrs[i]);
 111        }
 112        if (err)
 113                return err;
 114
 115        t->w_saved = wsaved;
 116        synchronize_user_stack();
 117        if (t->w_saved)
 118                return -EFAULT;
 119        return 0;
 120
 121}
 122