Root/
1 | /* |
2 | * Copyright 2004-2009 Analog Devices Inc. |
3 | * |
4 | * Licensed under the GPL-2 or later |
5 | */ |
6 | |
7 | #include <linux/linkage.h> |
8 | #include <asm/thread_info.h> |
9 | #include <asm/errno.h> |
10 | #include <asm/blackfin.h> |
11 | #include <asm/asm-offsets.h> |
12 | |
13 | #include <asm/context.S> |
14 | |
15 | #ifdef CONFIG_EXCPT_IRQ_SYSC_L1 |
16 | .section .l1.text |
17 | #else |
18 | .text |
19 | #endif |
20 | |
21 | ENTRY(_ret_from_fork) |
22 | #ifdef CONFIG_IPIPE |
23 | /* |
24 | * Hw IRQs are off on entry, and we don't want the scheduling tail |
25 | * code to starve high priority domains from interrupts while it |
26 | * runs. Therefore we first stall the root stage to have the |
27 | * virtual interrupt state reflect IMASK. |
28 | */ |
29 | p0.l = ___ipipe_root_status; |
30 | p0.h = ___ipipe_root_status; |
31 | r4 = [p0]; |
32 | bitset(r4, 0); |
33 | [p0] = r4; |
34 | /* |
35 | * Then we may enable hw IRQs, allowing preemption from high |
36 | * priority domains. schedule_tail() will do local_irq_enable() |
37 | * since Blackfin does not define __ARCH_WANT_UNLOCKED_CTXSW, so |
38 | * there is no need to unstall the root domain by ourselves |
39 | * afterwards. |
40 | */ |
41 | p0.l = _bfin_irq_flags; |
42 | p0.h = _bfin_irq_flags; |
43 | r4 = [p0]; |
44 | sti r4; |
45 | #endif /* CONFIG_IPIPE */ |
46 | SP += -12; |
47 | pseudo_long_call _schedule_tail, p5; |
48 | SP += 12; |
49 | r0 = [sp + PT_IPEND]; |
50 | cc = bittst(r0,1); |
51 | if cc jump .Lin_kernel; |
52 | RESTORE_CONTEXT |
53 | rti; |
54 | .Lin_kernel: |
55 | bitclr(r0,1); |
56 | [sp + PT_IPEND] = r0; |
57 | /* do a 'fake' RTI by jumping to [RETI] |
58 | * to avoid clearing supervisor mode in child |
59 | */ |
60 | r0 = [sp + PT_PC]; |
61 | [sp + PT_P0] = r0; |
62 | |
63 | RESTORE_ALL_SYS |
64 | jump (p0); |
65 | ENDPROC(_ret_from_fork) |
66 | |
67 | ENTRY(_sys_fork) |
68 | r0 = -EINVAL; |
69 | #if (ANOMALY_05000371) |
70 | nop; |
71 | nop; |
72 | nop; |
73 | #endif |
74 | rts; |
75 | ENDPROC(_sys_fork) |
76 | |
77 | ENTRY(_sys_vfork) |
78 | r0 = sp; |
79 | r0 += 24; |
80 | [--sp] = rets; |
81 | SP += -12; |
82 | pseudo_long_call _bfin_vfork, p2; |
83 | SP += 12; |
84 | rets = [sp++]; |
85 | rts; |
86 | ENDPROC(_sys_vfork) |
87 | |
88 | ENTRY(_sys_clone) |
89 | r0 = sp; |
90 | r0 += 24; |
91 | [--sp] = rets; |
92 | SP += -12; |
93 | pseudo_long_call _bfin_clone, p2; |
94 | SP += 12; |
95 | rets = [sp++]; |
96 | rts; |
97 | ENDPROC(_sys_clone) |
98 | |
99 | ENTRY(_sys_rt_sigreturn) |
100 | r0 = sp; |
101 | r0 += 24; |
102 | [--sp] = rets; |
103 | SP += -12; |
104 | pseudo_long_call _do_rt_sigreturn, p2; |
105 | SP += 12; |
106 | rets = [sp++]; |
107 | rts; |
108 | ENDPROC(_sys_rt_sigreturn) |
109 |
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v2.6.34-rc5
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