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9d42c84f | 1 | /* |
6d1a20b1 | 2 | * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) |
9d42c84f VG |
3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
9d42c84f VG |
8 | */ |
9 | ||
10 | #ifndef __ASM_ARC_ENTRY_H | |
11 | #define __ASM_ARC_ENTRY_H | |
12 | ||
9d42c84f | 13 | #include <asm/unistd.h> /* For NR_syscalls defination */ |
9d42c84f VG |
14 | #include <asm/arcregs.h> |
15 | #include <asm/ptrace.h> | |
080c3747 | 16 | #include <asm/processor.h> /* For VMALLOC_START */ |
4ffd9e2c | 17 | #include <asm/mmu.h> |
9d42c84f | 18 | |
1f6ccfff | 19 | #ifdef CONFIG_ISA_ARCOMPACT |
6d1a20b1 | 20 | #include <asm/entry-compact.h> /* ISA specific bits */ |
1f6ccfff VG |
21 | #else |
22 | #include <asm/entry-arcv2.h> | |
23 | #endif | |
6d1a20b1 | 24 | |
9d42c84f VG |
25 | /* Note on the LD/ST addr modes with addr reg wback |
26 | * | |
27 | * LD.a same as LD.aw | |
28 | * | |
29 | * LD.a reg1, [reg2, x] => Pre Incr | |
30 | * Eff Addr for load = [reg2 + x] | |
31 | * | |
32 | * LD.ab reg1, [reg2, x] => Post Incr | |
33 | * Eff Addr for load = [reg2] | |
34 | */ | |
35 | ||
3ebedbb2 VG |
36 | .macro PUSH reg |
37 | st.a \reg, [sp, -4] | |
38 | .endm | |
39 | ||
40 | .macro PUSHAX aux | |
41 | lr r9, [\aux] | |
42 | PUSH r9 | |
43 | .endm | |
44 | ||
45 | .macro POP reg | |
46 | ld.ab \reg, [sp, 4] | |
47 | .endm | |
48 | ||
49 | .macro POPAX aux | |
50 | POP r9 | |
51 | sr r9, [\aux] | |
52 | .endm | |
53 | ||
9d42c84f | 54 | /*-------------------------------------------------------------- |
3ebedbb2 VG |
55 | * Helpers to save/restore Scratch Regs: |
56 | * used by Interrupt/Exception Prologue/Epilogue | |
9d42c84f | 57 | *-------------------------------------------------------------*/ |
3ebedbb2 VG |
58 | .macro SAVE_R0_TO_R12 |
59 | PUSH r0 | |
60 | PUSH r1 | |
61 | PUSH r2 | |
62 | PUSH r3 | |
63 | PUSH r4 | |
64 | PUSH r5 | |
65 | PUSH r6 | |
66 | PUSH r7 | |
67 | PUSH r8 | |
68 | PUSH r9 | |
69 | PUSH r10 | |
70 | PUSH r11 | |
71 | PUSH r12 | |
72 | .endm | |
73 | ||
74 | .macro RESTORE_R12_TO_R0 | |
75 | POP r12 | |
76 | POP r11 | |
77 | POP r10 | |
78 | POP r9 | |
79 | POP r8 | |
80 | POP r7 | |
81 | POP r6 | |
82 | POP r5 | |
83 | POP r4 | |
84 | POP r3 | |
85 | POP r2 | |
86 | POP r1 | |
87 | POP r0 | |
359105bd | 88 | |
9d42c84f VG |
89 | .endm |
90 | ||
91 | /*-------------------------------------------------------------- | |
3ebedbb2 VG |
92 | * Helpers to save/restore callee-saved regs: |
93 | * used by several macros below | |
9d42c84f | 94 | *-------------------------------------------------------------*/ |
3ebedbb2 VG |
95 | .macro SAVE_R13_TO_R24 |
96 | PUSH r13 | |
97 | PUSH r14 | |
98 | PUSH r15 | |
99 | PUSH r16 | |
100 | PUSH r17 | |
101 | PUSH r18 | |
102 | PUSH r19 | |
103 | PUSH r20 | |
104 | PUSH r21 | |
105 | PUSH r22 | |
106 | PUSH r23 | |
107 | PUSH r24 | |
108 | .endm | |
109 | ||
110 | .macro RESTORE_R24_TO_R13 | |
111 | POP r24 | |
112 | POP r23 | |
113 | POP r22 | |
114 | POP r21 | |
115 | POP r20 | |
116 | POP r19 | |
117 | POP r18 | |
118 | POP r17 | |
119 | POP r16 | |
120 | POP r15 | |
121 | POP r14 | |
122 | POP r13 | |
9d42c84f VG |
123 | .endm |
124 | ||
9d42c84f | 125 | /*-------------------------------------------------------------- |
3ebedbb2 VG |
126 | * Collect User Mode callee regs as struct callee_regs - needed by |
127 | * fork/do_signal/unaligned-access-emulation. | |
128 | * (By default only scratch regs are saved on entry to kernel) | |
129 | * | |
130 | * Special handling for r25 if used for caching Task Pointer. | |
131 | * It would have been saved in task->thread.user_r25 already, but to keep | |
132 | * the interface same it is copied into regular r25 placeholder in | |
133 | * struct callee_regs. | |
9d42c84f VG |
134 | *-------------------------------------------------------------*/ |
135 | .macro SAVE_CALLEE_SAVED_USER | |
3ebedbb2 | 136 | |
0d7b8855 | 137 | mov r12, sp ; save SP as ref to pt_regs |
3ebedbb2 | 138 | SAVE_R13_TO_R24 |
080c3747 VG |
139 | |
140 | #ifdef CONFIG_ARC_CURR_IN_REG | |
0d7b8855 | 141 | ; Retrieve orig r25 and save it with rest of callee_regs |
86147e3c | 142 | ld r12, [r12, PT_user_r25] |
0d7b8855 | 143 | PUSH r12 |
080c3747 | 144 | #else |
3ebedbb2 | 145 | PUSH r25 |
080c3747 | 146 | #endif |
9d42c84f | 147 | |
9d42c84f VG |
148 | .endm |
149 | ||
150 | /*-------------------------------------------------------------- | |
3ebedbb2 VG |
151 | * Save kernel Mode callee regs at the time of Contect Switch. |
152 | * | |
153 | * Special handling for r25 if used for caching Task Pointer. | |
154 | * Kernel simply skips saving it since it will be loaded with | |
155 | * incoming task pointer anyways | |
9d42c84f VG |
156 | *-------------------------------------------------------------*/ |
157 | .macro SAVE_CALLEE_SAVED_KERNEL | |
3ebedbb2 VG |
158 | |
159 | SAVE_R13_TO_R24 | |
160 | ||
080c3747 | 161 | #ifdef CONFIG_ARC_CURR_IN_REG |
16f9afe6 | 162 | sub sp, sp, 4 |
080c3747 | 163 | #else |
3ebedbb2 | 164 | PUSH r25 |
080c3747 | 165 | #endif |
9d42c84f VG |
166 | .endm |
167 | ||
168 | /*-------------------------------------------------------------- | |
3ebedbb2 | 169 | * Opposite of SAVE_CALLEE_SAVED_KERNEL |
9d42c84f VG |
170 | *-------------------------------------------------------------*/ |
171 | .macro RESTORE_CALLEE_SAVED_KERNEL | |
172 | ||
080c3747 | 173 | #ifdef CONFIG_ARC_CURR_IN_REG |
16f9afe6 | 174 | add sp, sp, 4 /* skip usual r25 placeholder */ |
080c3747 | 175 | #else |
3ebedbb2 | 176 | POP r25 |
080c3747 | 177 | #endif |
3ebedbb2 | 178 | RESTORE_R24_TO_R13 |
9d42c84f VG |
179 | .endm |
180 | ||
c3581039 | 181 | /*-------------------------------------------------------------- |
3ebedbb2 VG |
182 | * Opposite of SAVE_CALLEE_SAVED_USER |
183 | * | |
184 | * ptrace tracer or unaligned-access fixup might have changed a user mode | |
185 | * callee reg which is saved back to usual r25 storage location | |
c3581039 VG |
186 | *-------------------------------------------------------------*/ |
187 | .macro RESTORE_CALLEE_SAVED_USER | |
188 | ||
c3581039 | 189 | #ifdef CONFIG_ARC_CURR_IN_REG |
0d7b8855 | 190 | POP r12 |
c3581039 | 191 | #else |
3ebedbb2 | 192 | POP r25 |
c3581039 | 193 | #endif |
3ebedbb2 | 194 | RESTORE_R24_TO_R13 |
0d7b8855 VG |
195 | |
196 | ; SP is back to start of pt_regs | |
197 | #ifdef CONFIG_ARC_CURR_IN_REG | |
86147e3c | 198 | st r12, [sp, PT_user_r25] |
0d7b8855 | 199 | #endif |
c3581039 VG |
200 | .endm |
201 | ||
9d42c84f VG |
202 | /*-------------------------------------------------------------- |
203 | * Super FAST Restore callee saved regs by simply re-adjusting SP | |
204 | *-------------------------------------------------------------*/ | |
205 | .macro DISCARD_CALLEE_SAVED_USER | |
16f9afe6 | 206 | add sp, sp, SZ_CALLEE_REGS |
9d42c84f VG |
207 | .endm |
208 | ||
9d42c84f VG |
209 | /*------------------------------------------------------------- |
210 | * given a tsk struct, get to the base of it's kernel mode stack | |
211 | * tsk->thread_info is really a PAGE, whose bottom hoists stack | |
212 | * which grows upwards towards thread_info | |
213 | *------------------------------------------------------------*/ | |
214 | ||
215 | .macro GET_TSK_STACK_BASE tsk, out | |
216 | ||
217 | /* Get task->thread_info (this is essentially start of a PAGE) */ | |
218 | ld \out, [\tsk, TASK_THREAD_INFO] | |
219 | ||
220 | /* Go to end of page where stack begins (grows upwards) */ | |
283237a0 | 221 | add2 \out, \out, (THREAD_SIZE)/4 |
9d42c84f VG |
222 | |
223 | .endm | |
224 | ||
9d42c84f VG |
225 | /* |
226 | * @reg [OUT] thread_info->flags of "current" | |
227 | */ | |
228 | .macro GET_CURR_THR_INFO_FLAGS reg | |
229 | GET_CURR_THR_INFO_FROM_SP \reg | |
230 | ld \reg, [\reg, THREAD_INFO_FLAGS] | |
231 | .endm | |
232 | ||
41195d23 VG |
233 | #ifdef CONFIG_SMP |
234 | ||
235 | /*------------------------------------------------- | |
236 | * Retrieve the current running task on this CPU | |
237 | * 1. Determine curr CPU id. | |
238 | * 2. Use it to index into _current_task[ ] | |
239 | */ | |
240 | .macro GET_CURR_TASK_ON_CPU reg | |
241 | GET_CPU_ID \reg | |
242 | ld.as \reg, [@_current_task, \reg] | |
243 | .endm | |
244 | ||
245 | /*------------------------------------------------- | |
246 | * Save a new task as the "current" task on this CPU | |
247 | * 1. Determine curr CPU id. | |
248 | * 2. Use it to index into _current_task[ ] | |
249 | * | |
250 | * Coded differently than GET_CURR_TASK_ON_CPU (which uses LD.AS) | |
251 | * because ST r0, [r1, offset] can ONLY have s9 @offset | |
252 | * while LD can take s9 (4 byte insn) or LIMM (8 byte insn) | |
253 | */ | |
254 | ||
255 | .macro SET_CURR_TASK_ON_CPU tsk, tmp | |
256 | GET_CPU_ID \tmp | |
257 | add2 \tmp, @_current_task, \tmp | |
258 | st \tsk, [\tmp] | |
259 | #ifdef CONFIG_ARC_CURR_IN_REG | |
260 | mov r25, \tsk | |
261 | #endif | |
262 | ||
263 | .endm | |
264 | ||
265 | ||
266 | #else /* Uniprocessor implementation of macros */ | |
267 | ||
9d42c84f VG |
268 | .macro GET_CURR_TASK_ON_CPU reg |
269 | ld \reg, [@_current_task] | |
270 | .endm | |
271 | ||
272 | .macro SET_CURR_TASK_ON_CPU tsk, tmp | |
273 | st \tsk, [@_current_task] | |
080c3747 VG |
274 | #ifdef CONFIG_ARC_CURR_IN_REG |
275 | mov r25, \tsk | |
276 | #endif | |
9d42c84f VG |
277 | .endm |
278 | ||
41195d23 VG |
279 | #endif /* SMP / UNI */ |
280 | ||
9d42c84f VG |
281 | /* ------------------------------------------------------------------ |
282 | * Get the ptr to some field of Current Task at @off in task struct | |
080c3747 | 283 | * -Uses r25 for Current task ptr if that is enabled |
9d42c84f VG |
284 | */ |
285 | ||
080c3747 VG |
286 | #ifdef CONFIG_ARC_CURR_IN_REG |
287 | ||
288 | .macro GET_CURR_TASK_FIELD_PTR off, reg | |
289 | add \reg, r25, \off | |
290 | .endm | |
291 | ||
292 | #else | |
293 | ||
9d42c84f VG |
294 | .macro GET_CURR_TASK_FIELD_PTR off, reg |
295 | GET_CURR_TASK_ON_CPU \reg | |
296 | add \reg, \reg, \off | |
297 | .endm | |
298 | ||
080c3747 VG |
299 | #endif /* CONFIG_ARC_CURR_IN_REG */ |
300 | ||
9d42c84f | 301 | #endif /* __ASM_ARC_ENTRY_H */ |