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/sched.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)
19 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
20 put_psr(get_psr() | PSR_EF);
21 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
22 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
23 regs->psr &= ~(PSR_EF);
24 clear_tsk_thread_flag(current, TIF_USEDFPU);
27 if (current == last_task_used_math) {
28 put_psr(get_psr() | PSR_EF);
29 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
30 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
31 last_task_used_math = NULL;
32 regs->psr &= ~(PSR_EF);
35 err |= __copy_to_user(&fpu->si_float_regs[0],
36 ¤t->thread.float_regs[0],
37 (sizeof(unsigned long) * 32));
38 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
39 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
40 if (current->thread.fpqdepth != 0)
41 err |= __copy_to_user(&fpu->si_fpqueue[0],
42 ¤t->thread.fpqueue[0],
43 ((sizeof(unsigned long) +
44 (sizeof(unsigned long *)))*16));
49 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
53 if (((unsigned long) fpu) & 3)
57 if (test_tsk_thread_flag(current, TIF_USEDFPU))
60 if (current == last_task_used_math) {
61 last_task_used_math = NULL;
66 clear_tsk_thread_flag(current, TIF_USEDFPU);
68 if (!access_ok(fpu, sizeof(*fpu)))
71 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
72 (sizeof(unsigned long) * 32));
73 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
74 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
75 if (current->thread.fpqdepth != 0)
76 err |= __copy_from_user(¤t->thread.fpqueue[0],
78 ((sizeof(unsigned long) +
79 (sizeof(unsigned long *)))*16));
83 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
85 int i, err = __put_user(wsaved, &rwin->wsaved);
87 for (i = 0; i < wsaved; i++) {
88 struct reg_window32 *rp;
91 rp = ¤t_thread_info()->reg_window[i];
92 fp = current_thread_info()->rwbuf_stkptrs[i];
93 err |= copy_to_user(&rwin->reg_window[i], rp,
94 sizeof(struct reg_window32));
95 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
100 int restore_rwin_state(__siginfo_rwin_t __user *rp)
102 struct thread_info *t = current_thread_info();
105 if (((unsigned long) rp) & 3)
108 get_user(wsaved, &rp->wsaved);
113 for (i = 0; i < wsaved; i++) {
114 err |= copy_from_user(&t->reg_window[i],
116 sizeof(struct reg_window32));
117 err |= __get_user(t->rwbuf_stkptrs[i],
118 &rp->rwbuf_stkptrs[i]);
124 synchronize_user_stack();