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Commit | Line | Data |
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174cd4b1 | 1 | #include <linux/sched/signal.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> |
4cf421e5 | 6 | #include <asm/ptrace.h> |
0ea820cf PM |
7 | |
8 | int init_fpu(struct task_struct *tsk) | |
9 | { | |
10 | if (tsk_used_math(tsk)) { | |
11 | if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) | |
12 | unlazy_fpu(tsk, task_pt_regs(tsk)); | |
13 | return 0; | |
14 | } | |
15 | ||
16 | /* | |
17 | * Memory allocation at the first usage of the FPU and other state. | |
18 | */ | |
19 | if (!tsk->thread.xstate) { | |
20 | tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
21 | GFP_KERNEL); | |
22 | if (!tsk->thread.xstate) | |
23 | return -ENOMEM; | |
24 | } | |
25 | ||
26 | if (boot_cpu_data.flags & CPU_HAS_FPU) { | |
27 | struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu; | |
28 | memset(fp, 0, xstate_size); | |
29 | fp->fpscr = FPSCR_INIT; | |
30 | } else { | |
31 | struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu; | |
32 | memset(fp, 0, xstate_size); | |
33 | fp->fpscr = FPSCR_INIT; | |
34 | } | |
35 | ||
36 | set_stopped_child_used_math(tsk); | |
37 | return 0; | |
38 | } | |
39 | ||
40 | #ifdef CONFIG_SH_FPU | |
41 | void __fpu_state_restore(void) | |
42 | { | |
43 | struct task_struct *tsk = current; | |
44 | ||
45 | restore_fpu(tsk); | |
46 | ||
47 | task_thread_info(tsk)->status |= TS_USEDFPU; | |
616c05d1 | 48 | tsk->thread.fpu_counter++; |
0ea820cf PM |
49 | } |
50 | ||
51 | void fpu_state_restore(struct pt_regs *regs) | |
52 | { | |
53 | struct task_struct *tsk = current; | |
54 | ||
55 | if (unlikely(!user_mode(regs))) { | |
56 | printk(KERN_ERR "BUG: FPU is used in kernel mode.\n"); | |
57 | BUG(); | |
58 | return; | |
59 | } | |
60 | ||
61 | if (!tsk_used_math(tsk)) { | |
4291b730 | 62 | local_irq_enable(); |
0ea820cf PM |
63 | /* |
64 | * does a slab alloc which can sleep | |
65 | */ | |
66 | if (init_fpu(tsk)) { | |
67 | /* | |
68 | * ran out of memory! | |
69 | */ | |
70 | do_group_exit(SIGKILL); | |
71 | return; | |
72 | } | |
4291b730 | 73 | local_irq_disable(); |
0ea820cf PM |
74 | } |
75 | ||
76 | grab_fpu(regs); | |
77 | ||
78 | __fpu_state_restore(); | |
79 | } | |
80 | ||
81 | BUILD_TRAP_HANDLER(fpu_state_restore) | |
82 | { | |
83 | TRAP_HANDLER_DECL; | |
84 | ||
85 | fpu_state_restore(regs); | |
86 | } | |
87 | #endif /* CONFIG_SH_FPU */ |