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 (((unsigned long) fpu) & 3)
56 if (test_tsk_thread_flag(current, TIF_USEDFPU))
59 if (current == last_task_used_math) {
60 last_task_used_math = NULL;
65 clear_tsk_thread_flag(current, TIF_USEDFPU);
67 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
70 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
71 (sizeof(unsigned long) * 32));
72 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
73 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
74 if (current->thread.fpqdepth != 0)
75 err |= __copy_from_user(¤t->thread.fpqueue[0],
77 ((sizeof(unsigned long) +
78 (sizeof(unsigned long *)))*16));
82 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
84 int i, err = __put_user(wsaved, &rwin->wsaved);
86 for (i = 0; i < wsaved; i++) {
87 struct reg_window32 *rp;
90 rp = ¤t_thread_info()->reg_window[i];
91 fp = current_thread_info()->rwbuf_stkptrs[i];
92 err |= copy_to_user(&rwin->reg_window[i], rp,
93 sizeof(struct reg_window32));
94 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
99 int restore_rwin_state(__siginfo_rwin_t __user *rp)
101 struct thread_info *t = current_thread_info();
104 if (((unsigned long) rp) & 3)
107 get_user(wsaved, &rp->wsaved);
112 for (i = 0; i < wsaved; i++) {
113 err |= copy_from_user(&t->reg_window[i],
115 sizeof(struct reg_window32));
116 err |= __get_user(t->rwbuf_stkptrs[i],
117 &rp->rwbuf_stkptrs[i]);
123 synchronize_user_stack();