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1 | /* |
2 | * File: arch/blackfin/kernel/entry.S | |
3 | * Based on: | |
4 | * Author: | |
5 | * | |
6 | * Created: | |
7 | * Description: | |
8 | * | |
9 | * Modified: | |
10 | * Copyright 2004-2006 Analog Devices Inc. | |
11 | * | |
12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, see the file COPYING, or write | |
26 | * to the Free Software Foundation, Inc., | |
27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
28 | */ | |
29 | ||
30 | #include <linux/linkage.h> | |
31 | #include <asm/thread_info.h> | |
32 | #include <asm/errno.h> | |
33 | #include <asm/asm-offsets.h> | |
34 | ||
35 | #include <asm/mach-common/context.S> | |
36 | ||
37 | #ifdef CONFIG_EXCPT_IRQ_SYSC_L1 | |
38 | .section .l1.text | |
39 | #else | |
40 | .text | |
41 | #endif | |
42 | ||
43 | ENTRY(_ret_from_fork) | |
44 | SP += -12; | |
45 | call _schedule_tail; | |
46 | SP += 12; | |
47 | r0 = [sp + PT_IPEND]; | |
48 | cc = bittst(r0,1); | |
49 | if cc jump .Lin_kernel; | |
50 | RESTORE_CONTEXT | |
51 | rti; | |
52 | .Lin_kernel: | |
53 | bitclr(r0,1); | |
54 | [sp + PT_IPEND] = r0; | |
55 | /* do a 'fake' RTI by jumping to [RETI] | |
56 | * to avoid clearing supervisor mode in child | |
57 | */ | |
58 | RESTORE_ALL_SYS | |
59 | p0 = reti; | |
60 | jump (p0); | |
51be24c3 | 61 | ENDPROC(_ret_from_fork) |
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62 | |
63 | ENTRY(_sys_fork) | |
64 | r0 = -EINVAL; | |
65 | rts; | |
51be24c3 | 66 | ENDPROC(_sys_fork) |
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67 | |
68 | ENTRY(_sys_vfork) | |
69 | r0 = sp; | |
70 | r0 += 24; | |
71 | [--sp] = rets; | |
72 | SP += -12; | |
73 | call _bfin_vfork; | |
74 | SP += 12; | |
75 | rets = [sp++]; | |
76 | rts; | |
51be24c3 | 77 | ENDPROC(_sys_vfork) |
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78 | |
79 | ENTRY(_sys_clone) | |
80 | r0 = sp; | |
81 | r0 += 24; | |
82 | [--sp] = rets; | |
83 | SP += -12; | |
84 | call _bfin_clone; | |
85 | SP += 12; | |
86 | rets = [sp++]; | |
87 | rts; | |
51be24c3 | 88 | ENDPROC(_sys_clone) |
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89 | |
90 | ENTRY(_sys_rt_sigreturn) | |
91 | r0 = sp; | |
92 | r0 += 24; | |
93 | [--sp] = rets; | |
94 | SP += -12; | |
95 | call _do_rt_sigreturn; | |
96 | SP += 12; | |
97 | rets = [sp++]; | |
98 | rts; | |
51be24c3 | 99 | ENDPROC(_sys_rt_sigreturn) |