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Commit | Line | Data |
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0ea820cf | 1 | #include <linux/sched.h> |
5a0e3ad6 | 2 | #include <linux/slab.h> |
0ea820cf PM |
3 | #include <asm/processor.h> |
4 | #include <asm/fpu.h> | |
5 | ||
6 | int init_fpu(struct task_struct *tsk) | |
7 | { | |
8 | if (tsk_used_math(tsk)) { | |
9 | if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) | |
10 | unlazy_fpu(tsk, task_pt_regs(tsk)); | |
11 | return 0; | |
12 | } | |
13 | ||
14 | /* | |
15 | * Memory allocation at the first usage of the FPU and other state. | |
16 | */ | |
17 | if (!tsk->thread.xstate) { | |
18 | tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
19 | GFP_KERNEL); | |
20 | if (!tsk->thread.xstate) | |
21 | return -ENOMEM; | |
22 | } | |
23 | ||
24 | if (boot_cpu_data.flags & CPU_HAS_FPU) { | |
25 | struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu; | |
26 | memset(fp, 0, xstate_size); | |
27 | fp->fpscr = FPSCR_INIT; | |
28 | } else { | |
29 | struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu; | |
30 | memset(fp, 0, xstate_size); | |
31 | fp->fpscr = FPSCR_INIT; | |
32 | } | |
33 | ||
34 | set_stopped_child_used_math(tsk); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | #ifdef CONFIG_SH_FPU | |
39 | void __fpu_state_restore(void) | |
40 | { | |
41 | struct task_struct *tsk = current; | |
42 | ||
43 | restore_fpu(tsk); | |
44 | ||
45 | task_thread_info(tsk)->status |= TS_USEDFPU; | |
46 | tsk->fpu_counter++; | |
47 | } | |
48 | ||
49 | void fpu_state_restore(struct pt_regs *regs) | |
50 | { | |
51 | struct task_struct *tsk = current; | |
52 | ||
53 | if (unlikely(!user_mode(regs))) { | |
54 | printk(KERN_ERR "BUG: FPU is used in kernel mode.\n"); | |
55 | BUG(); | |
56 | return; | |
57 | } | |
58 | ||
59 | if (!tsk_used_math(tsk)) { | |
4291b730 | 60 | local_irq_enable(); |
0ea820cf PM |
61 | /* |
62 | * does a slab alloc which can sleep | |
63 | */ | |
64 | if (init_fpu(tsk)) { | |
65 | /* | |
66 | * ran out of memory! | |
67 | */ | |
68 | do_group_exit(SIGKILL); | |
69 | return; | |
70 | } | |
4291b730 | 71 | local_irq_disable(); |
0ea820cf PM |
72 | } |
73 | ||
74 | grab_fpu(regs); | |
75 | ||
76 | __fpu_state_restore(); | |
77 | } | |
78 | ||
79 | BUILD_TRAP_HANDLER(fpu_state_restore) | |
80 | { | |
81 | TRAP_HANDLER_DECL; | |
82 | ||
83 | fpu_state_restore(regs); | |
84 | } | |
85 | #endif /* CONFIG_SH_FPU */ |