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102 lines
2.6 KiB
102 lines
2.6 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/errno.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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unsigned long *fpregs = current_thread_info()->fpregs; |
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unsigned long fprs; |
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int err = 0; |
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fprs = current_thread_info()->fpsaved[0]; |
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if (fprs & FPRS_DL) |
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err |= copy_to_user(&fpu->si_float_regs[0], fpregs, |
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(sizeof(unsigned int) * 32)); |
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if (fprs & FPRS_DU) |
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err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, |
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(sizeof(unsigned int) * 32)); |
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err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); |
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err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); |
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err |= __put_user(fprs, &fpu->si_fprs); |
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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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unsigned long *fpregs = current_thread_info()->fpregs; |
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unsigned long fprs; |
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int err; |
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if (((unsigned long) fpu) & 7) |
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return -EFAULT; |
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err = get_user(fprs, &fpu->si_fprs); |
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fprs_write(0); |
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regs->tstate &= ~TSTATE_PEF; |
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if (fprs & FPRS_DL) |
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err |= copy_from_user(fpregs, &fpu->si_float_regs[0], |
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(sizeof(unsigned int) * 32)); |
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if (fprs & FPRS_DU) |
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err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], |
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(sizeof(unsigned int) * 32)); |
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err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); |
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err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); |
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current_thread_info()->fpsaved[0] |= fprs; |
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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_window *rp = ¤t_thread_info()->reg_window[i]; |
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unsigned long 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_window)); |
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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) & 7) |
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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_window)); |
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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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set_thread_wsaved(wsaved); |
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synchronize_user_stack(); |
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if (get_thread_wsaved()) |
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return -EFAULT; |
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return 0; |
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}
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