LXR linux/arch/sparc/kernel/sigutil

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/kernel.h>
   3#include <linux/types.h>
   4#include <linux/thread_info.h>
   5#include <linux/uaccess.h>
   6#include <linux/errno.h>
   7
   8#include <asm/sigcontext.h>
   9#include <asm/fpumacro.h>
  10#include <asm/ptrace.h>
  11#include <asm/switch_to.h>
  12
  13#include "sigutil.h"
  14
  15int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  16{
  17        unsigned long *fpregs = current_thread_info()->fpregs;
  18        unsigned long fprs;
  19        int err = 0;
  20        
  21        fprs = current_thread_info()->fpsaved[0];
  22        if (fprs & FPRS_DL)
  23                err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
  24                                    (sizeof(unsigned int) * 32));
  25        if (fprs & FPRS_DU)
  26                err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
  27                                    (sizeof(unsigned int) * 32));
  28        err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  29        err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  30        err |= __put_user(fprs, &fpu->si_fprs);
  31
  32        return err;
  33}
  34
  35int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  36{
  37        unsigned long *fpregs = current_thread_info()->fpregs;
  38        unsigned long fprs;
  39        int err;
  40
  41        if (((unsigned long) fpu) & 7)
  42                return -EFAULT;
  43
  44        err = get_user(fprs, &fpu->si_fprs);
  45        fprs_write(0);
  46        regs->tstate &= ~TSTATE_PEF;
  47        if (fprs & FPRS_DL)
  48                err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
  49                               (sizeof(unsigned int) * 32));
  50        if (fprs & FPRS_DU)
  51                err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
  52                               (sizeof(unsigned int) * 32));
  53        err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
  54        err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
  55        current_thread_info()->fpsaved[0] |= fprs;
  56        return err;
  57}
  58
  59int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
  60{
  61        int i, err = __put_user(wsaved, &rwin->wsaved);
  62
  63        for (i = 0; i < wsaved; i++) {
  64                struct reg_window *rp = &current_thread_info()->reg_window[i];
  65                unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
  66
  67                err |= copy_to_user(&rwin->reg_window[i], rp,
  68                                    sizeof(struct reg_window));
  69                err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
  70        }
  71        return err;
  72}
  73
  74int restore_rwin_state(__siginfo_rwin_t __user *rp)
  75{
  76        struct thread_info *t = current_thread_info();
  77        int i, wsaved, err;
  78
  79        if (((unsigned long) rp) & 7)
  80                return -EFAULT;
  81
  82        get_user(wsaved, &rp->wsaved);
  83        if (wsaved > NSWINS)
  84                return -EFAULT;
  85
  86        err = 0;
  87        for (i = 0; i < wsaved; i++) {
  88                err |= copy_from_user(&t->reg_window[i],
  89                                      &rp->reg_window[i],
  90                                      sizeof(struct reg_window));
  91                err |= __get_user(t->rwbuf_stkptrs[i],
  92                                  &rp->rwbuf_stkptrs[i]);
  93        }
  94        if (err)
  95                return err;
  96
  97        set_thread_wsaved(wsaved);
  98        synchronize_user_stack();
  99        if (get_thread_wsaved())
 100                return -EFAULT;
 101        return 0;
 102}
 103