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>
13 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
17 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
18 put_psr(get_psr() | PSR_EF);
19 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
20 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
21 regs->psr &= ~(PSR_EF);
22 clear_tsk_thread_flag(current, TIF_USEDFPU);
25 if (current == last_task_used_math) {
26 put_psr(get_psr() | PSR_EF);
27 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
28 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
29 last_task_used_math = NULL;
30 regs->psr &= ~(PSR_EF);
33 err |= __copy_to_user(&fpu->si_float_regs[0],
34 ¤t->thread.float_regs[0],
35 (sizeof(unsigned long) * 32));
36 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
37 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
38 if (current->thread.fpqdepth != 0)
39 err |= __copy_to_user(&fpu->si_fpqueue[0],
40 ¤t->thread.fpqueue[0],
41 ((sizeof(unsigned long) +
42 (sizeof(unsigned long *)))*16));
47 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
51 if (test_tsk_thread_flag(current, TIF_USEDFPU))
54 if (current == last_task_used_math) {
55 last_task_used_math = NULL;
60 clear_tsk_thread_flag(current, TIF_USEDFPU);
62 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
65 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
66 (sizeof(unsigned long) * 32));
67 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
68 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
69 if (current->thread.fpqdepth != 0)
70 err |= __copy_from_user(¤t->thread.fpqueue[0],
72 ((sizeof(unsigned long) +
73 (sizeof(unsigned long *)))*16));
77 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
79 int i, err = __put_user(wsaved, &rwin->wsaved);
81 for (i = 0; i < wsaved; i++) {
82 struct reg_window32 *rp;
85 rp = ¤t_thread_info()->reg_window[i];
86 fp = current_thread_info()->rwbuf_stkptrs[i];
87 err |= copy_to_user(&rwin->reg_window[i], rp,
88 sizeof(struct reg_window32));
89 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
94 int restore_rwin_state(__siginfo_rwin_t __user *rp)
96 struct thread_info *t = current_thread_info();
99 __get_user(wsaved, &rp->wsaved);
104 for (i = 0; i < wsaved; i++) {
105 err |= copy_from_user(&t->reg_window[i],
107 sizeof(struct reg_window32));
108 err |= __get_user(t->rwbuf_stkptrs[i],
109 &rp->rwbuf_stkptrs[i]);
115 synchronize_user_stack();