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129 lines
3.3 KiB
129 lines
3.3 KiB
// 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(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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