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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> | |
f03c4866 | 5 | #include <asm/traps.h> |
0ea820cf PM |
6 | |
7 | int init_fpu(struct task_struct *tsk) | |
8 | { | |
9 | if (tsk_used_math(tsk)) { | |
10 | if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) | |
11 | unlazy_fpu(tsk, task_pt_regs(tsk)); | |
12 | return 0; | |
13 | } | |
14 | ||
15 | /* | |
16 | * Memory allocation at the first usage of the FPU and other state. | |
17 | */ | |
18 | if (!tsk->thread.xstate) { | |
19 | tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
20 | GFP_KERNEL); | |
21 | if (!tsk->thread.xstate) | |
22 | return -ENOMEM; | |
23 | } | |
24 | ||
25 | if (boot_cpu_data.flags & CPU_HAS_FPU) { | |
26 | struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu; | |
27 | memset(fp, 0, xstate_size); | |
28 | fp->fpscr = FPSCR_INIT; | |
29 | } else { | |
30 | struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu; | |
31 | memset(fp, 0, xstate_size); | |
32 | fp->fpscr = FPSCR_INIT; | |
33 | } | |
34 | ||
35 | set_stopped_child_used_math(tsk); | |
36 | return 0; | |
37 | } | |
38 | ||
39 | #ifdef CONFIG_SH_FPU | |
40 | void __fpu_state_restore(void) | |
41 | { | |
42 | struct task_struct *tsk = current; | |
43 | ||
44 | restore_fpu(tsk); | |
45 | ||
46 | task_thread_info(tsk)->status |= TS_USEDFPU; | |
616c05d1 | 47 | tsk->thread.fpu_counter++; |
0ea820cf PM |
48 | } |
49 | ||
50 | void fpu_state_restore(struct pt_regs *regs) | |
51 | { | |
52 | struct task_struct *tsk = current; | |
53 | ||
54 | if (unlikely(!user_mode(regs))) { | |
55 | printk(KERN_ERR "BUG: FPU is used in kernel mode.\n"); | |
56 | BUG(); | |
57 | return; | |
58 | } | |
59 | ||
60 | if (!tsk_used_math(tsk)) { | |
4291b730 | 61 | local_irq_enable(); |
0ea820cf PM |
62 | /* |
63 | * does a slab alloc which can sleep | |
64 | */ | |
65 | if (init_fpu(tsk)) { | |
66 | /* | |
67 | * ran out of memory! | |
68 | */ | |
69 | do_group_exit(SIGKILL); | |
70 | return; | |
71 | } | |
4291b730 | 72 | local_irq_disable(); |
0ea820cf PM |
73 | } |
74 | ||
75 | grab_fpu(regs); | |
76 | ||
77 | __fpu_state_restore(); | |
78 | } | |
79 | ||
80 | BUILD_TRAP_HANDLER(fpu_state_restore) | |
81 | { | |
82 | TRAP_HANDLER_DECL; | |
83 | ||
84 | fpu_state_restore(regs); | |
85 | } | |
86 | #endif /* CONFIG_SH_FPU */ |