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