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/errno.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        unsigned long *fpregs = current_thread_info()->fpregs;
  17        unsigned long fprs;
  18        int err = 0;
  19        
  20        fprs = current_thread_info()->fpsaved[0];
  21        if (fprs & FPRS_DL)
  22                err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  23                                    (sizeof(unsigned int) * 32));
  24        if (fprs & FPRS_DU)
  25                err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  26                                    (sizeof(unsigned int) * 32));
  27        err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  28        err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  29        err |= __put_user(fprs, &fpu->si_fprs);
  30
  31        return err;
  32}
  33
  34int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  35{
  36        unsigned long *fpregs = current_thread_info()->fpregs;
  37        unsigned long fprs;
  38        int err;
  39
  40        if (((unsigned long) fpu) & 7)
  41                return -EFAULT;
  42
  43        err = get_user(fprs, &fpu->si_fprs);
  44        fprs_write(0);
  45        regs->tstate &= ~TSTATE_PEF;
  46        if (fprs & FPRS_DL)
  47                err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  48                               (sizeof(unsigned int) * 32));
  49        if (fprs & FPRS_DU)
  50                err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  51                               (sizeof(unsigned int) * 32));
  52        err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  53        err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  54        current_thread_info()->fpsaved[0] |= fprs;
  55        return err;
  56}
  57
  58int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  59{
  60        int i, err = __put_user(wsaved, &rwin->wsaved);
  61
  62        for (i = 0; i < wsaved; i++) {
  63                struct reg_window *rp = &current_thread_info()->reg_window[i];
  64                unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  65
  66                err |= copy_to_user(&rwin->reg_window[i], rp,
  67                                    sizeof(struct reg_window));
  68                err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  69        }
  70        return err;
  71}
  72
  73int restore_rwin_state(__siginfo_rwin_t __user *rp)
  74{
  75        struct thread_info *t = current_thread_info();
  76        int i, wsaved, err;
  77
  78        if (((unsigned long) rp) & 7)
  79                return -EFAULT;
  80
  81        get_user(wsaved, &rp->wsaved);
  82        if (wsaved > NSWINS)
  83                return -EFAULT;
  84
  85        err = 0;
  86        for (i = 0; i < wsaved; i++) {
  87                err |= copy_from_user(&t->reg_window[i],
  88                                      &rp->reg_window[i],
  89                                      sizeof(struct reg_window));
  90                err |= __get_user(t->rwbuf_stkptrs[i],
  91                                  &rp->rwbuf_stkptrs[i]);
  92        }
  93        if (err)
  94                return err;
  95
  96        set_thread_wsaved(wsaved);
  97        synchronize_user_stack();
  98        if (get_thread_wsaved())
  99                return -EFAULT;
 100        return 0;
 101}
 102