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>
8 #include <asm/sigcontext.h>
9 #include <asm/fpumacro.h>
10 #include <asm/ptrace.h>
11 #include <asm/switch_to.h>
15 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
17 unsigned long *fpregs = current_thread_info()->fpregs;
21 fprs = current_thread_info()->fpsaved[0];
23 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
24 (sizeof(unsigned int) * 32));
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);
35 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
37 unsigned long *fpregs = current_thread_info()->fpregs;
41 if (((unsigned long) fpu) & 7)
44 err = get_user(fprs, &fpu->si_fprs);
46 regs->tstate &= ~TSTATE_PEF;
48 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
49 (sizeof(unsigned int) * 32));
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;
59 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
61 int i, err = __put_user(wsaved, &rwin->wsaved);
63 for (i = 0; i < wsaved; i++) {
64 struct reg_window *rp = ¤t_thread_info()->reg_window[i];
65 unsigned long fp = current_thread_info()->rwbuf_stkptrs[i];
67 err |= copy_to_user(&rwin->reg_window[i], rp,
68 sizeof(struct reg_window));
69 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
74 int restore_rwin_state(__siginfo_rwin_t __user *rp)
76 struct thread_info *t = current_thread_info();
79 if (((unsigned long) rp) & 7)
82 get_user(wsaved, &rp->wsaved);
87 for (i = 0; i < wsaved; i++) {
88 err |= copy_from_user(&t->reg_window[i],
90 sizeof(struct reg_window));
91 err |= __get_user(t->rwbuf_stkptrs[i],
92 &rp->rwbuf_stkptrs[i]);
97 set_thread_wsaved(wsaved);
98 synchronize_user_stack();
99 if (get_thread_wsaved())