1 #include <linux/kernel.h>
2 #include <linux/types.h>
3 #include <linux/thread_info.h>
4 #include <linux/uaccess.h>
5 #include <linux/sched.h>
7 #include <asm/sigcontext.h>
8 #include <asm/fpumacro.h>
9 #include <asm/ptrace.h>
10 #include <asm/switch_to.h>
14 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
18 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
19 put_psr(get_psr() | PSR_EF);
20 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
21 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
22 regs->psr &= ~(PSR_EF);
23 clear_tsk_thread_flag(current, TIF_USEDFPU);
26 if (current == last_task_used_math) {
27 put_psr(get_psr() | PSR_EF);
28 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
29 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
30 last_task_used_math = NULL;
31 regs->psr &= ~(PSR_EF);
34 err |= __copy_to_user(&fpu->si_float_regs[0],
35 ¤t->thread.float_regs[0],
36 (sizeof(unsigned long) * 32));
37 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
38 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
39 if (current->thread.fpqdepth != 0)
40 err |= __copy_to_user(&fpu->si_fpqueue[0],
41 ¤t->thread.fpqueue[0],
42 ((sizeof(unsigned long) +
43 (sizeof(unsigned long *)))*16));
48 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
52 if (test_tsk_thread_flag(current, TIF_USEDFPU))
55 if (current == last_task_used_math) {
56 last_task_used_math = NULL;
61 clear_tsk_thread_flag(current, TIF_USEDFPU);
63 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
66 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
67 (sizeof(unsigned long) * 32));
68 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
69 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
70 if (current->thread.fpqdepth != 0)
71 err |= __copy_from_user(¤t->thread.fpqueue[0],
73 ((sizeof(unsigned long) +
74 (sizeof(unsigned long *)))*16));
78 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
80 int i, err = __put_user(wsaved, &rwin->wsaved);
82 for (i = 0; i < wsaved; i++) {
83 struct reg_window32 *rp;
86 rp = ¤t_thread_info()->reg_window[i];
87 fp = current_thread_info()->rwbuf_stkptrs[i];
88 err |= copy_to_user(&rwin->reg_window[i], rp,
89 sizeof(struct reg_window32));
90 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
95 int restore_rwin_state(__siginfo_rwin_t __user *rp)
97 struct thread_info *t = current_thread_info();
100 __get_user(wsaved, &rp->wsaved);
105 for (i = 0; i < wsaved; i++) {
106 err |= copy_from_user(&t->reg_window[i],
108 sizeof(struct reg_window32));
109 err |= __get_user(t->rwbuf_stkptrs[i],
110 &rp->rwbuf_stkptrs[i]);
116 synchronize_user_stack();