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1da177e4 LT |
1 | #ifndef __M68KNOMMU_ENTRY_H |
2 | #define __M68KNOMMU_ENTRY_H | |
3 | ||
1da177e4 LT |
4 | #include <asm/setup.h> |
5 | #include <asm/page.h> | |
6 | ||
7 | /* | |
8 | * Stack layout in 'ret_from_exception': | |
9 | * | |
10 | * This allows access to the syscall arguments in registers d1-d5 | |
11 | * | |
12 | * 0(sp) - d1 | |
13 | * 4(sp) - d2 | |
14 | * 8(sp) - d3 | |
15 | * C(sp) - d4 | |
16 | * 10(sp) - d5 | |
17 | * 14(sp) - a0 | |
18 | * 18(sp) - a1 | |
19 | * 1C(sp) - a2 | |
20 | * 20(sp) - d0 | |
21 | * 24(sp) - orig_d0 | |
22 | * 28(sp) - stack adjustment | |
23 | * 2C(sp) - [ sr ] [ format & vector ] | |
24 | * 2E(sp) - [ pc-hiword ] [ sr ] | |
25 | * 30(sp) - [ pc-loword ] [ pc-hiword ] | |
26 | * 32(sp) - [ format & vector ] [ pc-loword ] | |
27 | * ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ | |
28 | * M68K COLDFIRE | |
29 | */ | |
30 | ||
31 | #define ALLOWINT 0xf8ff | |
32 | ||
33 | #ifdef __ASSEMBLY__ | |
34 | ||
35 | /* process bits for task_struct.flags */ | |
36 | PF_TRACESYS_OFF = 3 | |
37 | PF_TRACESYS_BIT = 5 | |
38 | PF_PTRACED_OFF = 3 | |
39 | PF_PTRACED_BIT = 4 | |
40 | PF_DTRACE_OFF = 1 | |
41 | PF_DTRACE_BIT = 5 | |
42 | ||
43 | LENOSYS = 38 | |
44 | ||
45 | #define SWITCH_STACK_SIZE (6*4+4) /* Includes return address */ | |
46 | ||
47 | /* | |
48 | * This defines the normal kernel pt-regs layout. | |
49 | * | |
50 | * regs are a2-a6 and d6-d7 preserved by C code | |
51 | * the kernel doesn't mess with usp unless it needs to | |
52 | */ | |
53 | ||
54 | #ifdef CONFIG_COLDFIRE | |
55 | /* | |
56 | * This is made a little more tricky on the ColdFire. There is no | |
57 | * separate kernel and user stack pointers. Need to artificially | |
58 | * construct a usp in software... When doing this we need to disable | |
59 | * interrupts, otherwise bad things could happen. | |
60 | */ | |
61 | .macro SAVE_ALL | |
62 | move #0x2700,%sr /* disable intrs */ | |
63 | btst #5,%sp@(2) /* from user? */ | |
64 | bnes 6f /* no, skip */ | |
65 | movel %sp,sw_usp /* save user sp */ | |
66 | addql #8,sw_usp /* remove exception */ | |
67 | movel sw_ksp,%sp /* kernel sp */ | |
68 | subql #8,%sp /* room for exception */ | |
69 | clrl %sp@- /* stkadj */ | |
70 | movel %d0,%sp@- /* orig d0 */ | |
71 | movel %d0,%sp@- /* d0 */ | |
72 | lea %sp@(-32),%sp /* space for 8 regs */ | |
73 | moveml %d1-%d5/%a0-%a2,%sp@ | |
74 | movel sw_usp,%a0 /* get usp */ | |
75 | movel %a0@-,%sp@(PT_PC) /* copy exception program counter */ | |
76 | movel %a0@-,%sp@(PT_FORMATVEC)/* copy exception format/vector/sr */ | |
77 | bra 7f | |
78 | 6: | |
79 | clrl %sp@- /* stkadj */ | |
80 | movel %d0,%sp@- /* orig d0 */ | |
81 | movel %d0,%sp@- /* d0 */ | |
82 | lea %sp@(-32),%sp /* space for 8 regs */ | |
83 | moveml %d1-%d5/%a0-%a2,%sp@ | |
84 | 7: | |
85 | .endm | |
86 | ||
87 | .macro RESTORE_ALL | |
88 | btst #5,%sp@(PT_SR) /* going user? */ | |
89 | bnes 8f /* no, skip */ | |
90 | move #0x2700,%sr /* disable intrs */ | |
91 | movel sw_usp,%a0 /* get usp */ | |
92 | movel %sp@(PT_PC),%a0@- /* copy exception program counter */ | |
93 | movel %sp@(PT_FORMATVEC),%a0@-/* copy exception format/vector/sr */ | |
94 | moveml %sp@,%d1-%d5/%a0-%a2 | |
95 | lea %sp@(32),%sp /* space for 8 regs */ | |
96 | movel %sp@+,%d0 | |
97 | addql #4,%sp /* orig d0 */ | |
98 | addl %sp@+,%sp /* stkadj */ | |
99 | addql #8,%sp /* remove exception */ | |
100 | movel %sp,sw_ksp /* save ksp */ | |
101 | subql #8,sw_usp /* set exception */ | |
102 | movel sw_usp,%sp /* restore usp */ | |
103 | rte | |
104 | 8: | |
105 | moveml %sp@,%d1-%d5/%a0-%a2 | |
106 | lea %sp@(32),%sp /* space for 8 regs */ | |
107 | movel %sp@+,%d0 | |
108 | addql #4,%sp /* orig d0 */ | |
109 | addl %sp@+,%sp /* stkadj */ | |
110 | rte | |
111 | .endm | |
112 | ||
113 | /* | |
114 | * Quick exception save, use current stack only. | |
115 | */ | |
116 | .macro SAVE_LOCAL | |
117 | move #0x2700,%sr /* disable intrs */ | |
118 | clrl %sp@- /* stkadj */ | |
119 | movel %d0,%sp@- /* orig d0 */ | |
120 | movel %d0,%sp@- /* d0 */ | |
121 | lea %sp@(-32),%sp /* space for 8 regs */ | |
122 | moveml %d1-%d5/%a0-%a2,%sp@ | |
123 | .endm | |
124 | ||
125 | .macro RESTORE_LOCAL | |
126 | moveml %sp@,%d1-%d5/%a0-%a2 | |
127 | lea %sp@(32),%sp /* space for 8 regs */ | |
128 | movel %sp@+,%d0 | |
129 | addql #4,%sp /* orig d0 */ | |
130 | addl %sp@+,%sp /* stkadj */ | |
131 | rte | |
132 | .endm | |
133 | ||
134 | .macro SAVE_SWITCH_STACK | |
135 | lea %sp@(-24),%sp /* 6 regs */ | |
136 | moveml %a3-%a6/%d6-%d7,%sp@ | |
137 | .endm | |
138 | ||
139 | .macro RESTORE_SWITCH_STACK | |
140 | moveml %sp@,%a3-%a6/%d6-%d7 | |
141 | lea %sp@(24),%sp /* 6 regs */ | |
142 | .endm | |
143 | ||
144 | /* | |
145 | * Software copy of the user and kernel stack pointers... Ugh... | |
146 | * Need these to get around ColdFire not having separate kernel | |
147 | * and user stack pointers. | |
148 | */ | |
149 | .globl sw_usp | |
150 | .globl sw_ksp | |
151 | ||
152 | #else /* !CONFIG_COLDFIRE */ | |
153 | ||
154 | /* | |
155 | * Standard 68k interrupt entry and exit macros. | |
156 | */ | |
157 | .macro SAVE_ALL | |
158 | clrl %sp@- /* stkadj */ | |
159 | movel %d0,%sp@- /* orig d0 */ | |
160 | movel %d0,%sp@- /* d0 */ | |
161 | moveml %d1-%d5/%a0-%a2,%sp@- | |
162 | .endm | |
163 | ||
164 | .macro RESTORE_ALL | |
165 | moveml %sp@+,%a0-%a2/%d1-%d5 | |
166 | movel %sp@+,%d0 | |
167 | addql #4,%sp /* orig d0 */ | |
168 | addl %sp@+,%sp /* stkadj */ | |
169 | rte | |
170 | .endm | |
171 | ||
172 | .macro SAVE_SWITCH_STACK | |
173 | moveml %a3-%a6/%d6-%d7,%sp@- | |
174 | .endm | |
175 | ||
176 | .macro RESTORE_SWITCH_STACK | |
177 | moveml %sp@+,%a3-%a6/%d6-%d7 | |
178 | .endm | |
179 | ||
180 | #endif /* !CONFIG_COLDFIRE */ | |
181 | #endif /* __ASSEMBLY__ */ | |
182 | #endif /* __M68KNOMMU_ENTRY_H */ |