130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/thread_info.h>
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#include <linux/uaccess.h>
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#include <linux/sched.h>
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#include <asm/sigcontext.h>
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#include <asm/fpumacro.h>
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#include <asm/ptrace.h>
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#include <asm/switch_to.h>
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#include "sigutil.h"
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int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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int err = 0;
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#ifdef CONFIG_SMP
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if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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regs->psr &= ~(PSR_EF);
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clear_tsk_thread_flag(current, TIF_USEDFPU);
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}
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#else
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if (current == last_task_used_math) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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last_task_used_math = NULL;
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regs->psr &= ~(PSR_EF);
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}
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#endif
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err |= __copy_to_user(&fpu->si_float_regs[0],
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¤t->thread.float_regs[0],
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(sizeof(unsigned long) * 32));
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err |= __put_user(current->thread.fsr, &fpu->si_fsr);
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err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
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if (current->thread.fpqdepth != 0)
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err |= __copy_to_user(&fpu->si_fpqueue[0],
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¤t->thread.fpqueue[0],
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((sizeof(unsigned long) +
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(sizeof(unsigned long *)))*16));
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clear_used_math();
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return err;
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}
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int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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int err;
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if (((unsigned long) fpu) & 3)
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return -EFAULT;
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#ifdef CONFIG_SMP
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if (test_tsk_thread_flag(current, TIF_USEDFPU))
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regs->psr &= ~PSR_EF;
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#else
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if (current == last_task_used_math) {
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last_task_used_math = NULL;
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regs->psr &= ~PSR_EF;
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}
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#endif
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set_used_math();
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clear_tsk_thread_flag(current, TIF_USEDFPU);
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if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
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return -EFAULT;
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err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
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(sizeof(unsigned long) * 32));
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err |= __get_user(current->thread.fsr, &fpu->si_fsr);
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err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
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if (current->thread.fpqdepth != 0)
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err |= __copy_from_user(¤t->thread.fpqueue[0],
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&fpu->si_fpqueue[0],
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((sizeof(unsigned long) +
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(sizeof(unsigned long *)))*16));
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return err;
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}
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int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
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{
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int i, err = __put_user(wsaved, &rwin->wsaved);
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for (i = 0; i < wsaved; i++) {
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struct reg_window32 *rp;
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unsigned long fp;
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rp = ¤t_thread_info()->reg_window[i];
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fp = current_thread_info()->rwbuf_stkptrs[i];
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err |= copy_to_user(&rwin->reg_window[i], rp,
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sizeof(struct reg_window32));
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err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
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}
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return err;
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}
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int restore_rwin_state(__siginfo_rwin_t __user *rp)
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{
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struct thread_info *t = current_thread_info();
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int i, wsaved, err;
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if (((unsigned long) rp) & 3)
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return -EFAULT;
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get_user(wsaved, &rp->wsaved);
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if (wsaved > NSWINS)
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return -EFAULT;
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err = 0;
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for (i = 0; i < wsaved; i++) {
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err |= copy_from_user(&t->reg_window[i],
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&rp->reg_window[i],
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sizeof(struct reg_window32));
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err |= __get_user(t->rwbuf_stkptrs[i],
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&rp->rwbuf_stkptrs[i]);
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}
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if (err)
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return err;
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t->w_saved = wsaved;
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synchronize_user_stack();
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if (t->w_saved)
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return -EFAULT;
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return 0;
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}
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