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1394f032 BW |
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 | ||
639f6571 | 35 | #include <asm/context.S> |
1394f032 BW |
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 | |
aa770aa7 RG |
57 | */ |
58 | r0 = [sp + PT_PC]; | |
59 | [sp + PT_P0] = r0; | |
60 | ||
1394f032 | 61 | RESTORE_ALL_SYS |
1394f032 | 62 | jump (p0); |
51be24c3 | 63 | ENDPROC(_ret_from_fork) |
1394f032 BW |
64 | |
65 | ENTRY(_sys_fork) | |
66 | r0 = -EINVAL; | |
2cfebf2b MH |
67 | #if (ANOMALY_05000371) |
68 | nop; | |
69 | nop; | |
70 | nop; | |
71 | #endif | |
1394f032 | 72 | rts; |
51be24c3 | 73 | ENDPROC(_sys_fork) |
1394f032 BW |
74 | |
75 | ENTRY(_sys_vfork) | |
76 | r0 = sp; | |
77 | r0 += 24; | |
78 | [--sp] = rets; | |
79 | SP += -12; | |
80 | call _bfin_vfork; | |
81 | SP += 12; | |
82 | rets = [sp++]; | |
83 | rts; | |
51be24c3 | 84 | ENDPROC(_sys_vfork) |
1394f032 BW |
85 | |
86 | ENTRY(_sys_clone) | |
87 | r0 = sp; | |
88 | r0 += 24; | |
89 | [--sp] = rets; | |
90 | SP += -12; | |
91 | call _bfin_clone; | |
92 | SP += 12; | |
93 | rets = [sp++]; | |
94 | rts; | |
51be24c3 | 95 | ENDPROC(_sys_clone) |
1394f032 BW |
96 | |
97 | ENTRY(_sys_rt_sigreturn) | |
98 | r0 = sp; | |
99 | r0 += 24; | |
100 | [--sp] = rets; | |
101 | SP += -12; | |
102 | call _do_rt_sigreturn; | |
103 | SP += 12; | |
104 | rets = [sp++]; | |
105 | rts; | |
51be24c3 | 106 | ENDPROC(_sys_rt_sigreturn) |