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Commit | Line | Data |
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174cd4b1 | 1 | #include <linux/sched/signal.h> |
29930025 | 2 | #include <linux/sched/task.h> |
68db0cf1 | 3 | #include <linux/sched/task_stack.h> |
5a0e3ad6 | 4 | #include <linux/slab.h> |
0ea820cf PM |
5 | #include <asm/processor.h> |
6 | #include <asm/fpu.h> | |
f03c4866 | 7 | #include <asm/traps.h> |
4cf421e5 | 8 | #include <asm/ptrace.h> |
0ea820cf PM |
9 | |
10 | int init_fpu(struct task_struct *tsk) | |
11 | { | |
12 | if (tsk_used_math(tsk)) { | |
13 | if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) | |
14 | unlazy_fpu(tsk, task_pt_regs(tsk)); | |
15 | return 0; | |
16 | } | |
17 | ||
18 | /* | |
19 | * Memory allocation at the first usage of the FPU and other state. | |
20 | */ | |
21 | if (!tsk->thread.xstate) { | |
22 | tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
23 | GFP_KERNEL); | |
24 | if (!tsk->thread.xstate) | |
25 | return -ENOMEM; | |
26 | } | |
27 | ||
28 | if (boot_cpu_data.flags & CPU_HAS_FPU) { | |
29 | struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu; | |
30 | memset(fp, 0, xstate_size); | |
31 | fp->fpscr = FPSCR_INIT; | |
32 | } else { | |
33 | struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu; | |
34 | memset(fp, 0, xstate_size); | |
35 | fp->fpscr = FPSCR_INIT; | |
36 | } | |
37 | ||
38 | set_stopped_child_used_math(tsk); | |
39 | return 0; | |
40 | } | |
41 | ||
42 | #ifdef CONFIG_SH_FPU | |
43 | void __fpu_state_restore(void) | |
44 | { | |
45 | struct task_struct *tsk = current; | |
46 | ||
47 | restore_fpu(tsk); | |
48 | ||
49 | task_thread_info(tsk)->status |= TS_USEDFPU; | |
616c05d1 | 50 | tsk->thread.fpu_counter++; |
0ea820cf PM |
51 | } |
52 | ||
53 | void fpu_state_restore(struct pt_regs *regs) | |
54 | { | |
55 | struct task_struct *tsk = current; | |
56 | ||
57 | if (unlikely(!user_mode(regs))) { | |
58 | printk(KERN_ERR "BUG: FPU is used in kernel mode.\n"); | |
59 | BUG(); | |
60 | return; | |
61 | } | |
62 | ||
63 | if (!tsk_used_math(tsk)) { | |
4291b730 | 64 | local_irq_enable(); |
0ea820cf PM |
65 | /* |
66 | * does a slab alloc which can sleep | |
67 | */ | |
68 | if (init_fpu(tsk)) { | |
69 | /* | |
70 | * ran out of memory! | |
71 | */ | |
72 | do_group_exit(SIGKILL); | |
73 | return; | |
74 | } | |
4291b730 | 75 | local_irq_disable(); |
0ea820cf PM |
76 | } |
77 | ||
78 | grab_fpu(regs); | |
79 | ||
80 | __fpu_state_restore(); | |
81 | } | |
82 | ||
83 | BUILD_TRAP_HANDLER(fpu_state_restore) | |
84 | { | |
85 | TRAP_HANDLER_DECL; | |
86 | ||
87 | fpu_state_restore(regs); | |
88 | } | |
89 | #endif /* CONFIG_SH_FPU */ |