1
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3#ifndef __ASM_ARC_ENTRY_ARCV2_H
4#define __ASM_ARC_ENTRY_ARCV2_H
5
6#include <asm/asm-offsets.h>
7#include <asm/dsp-impl.h>
8#include <asm/irqflags-arcv2.h>
9#include <asm/thread_info.h>
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50.macro INTERRUPT_PROLOGUE
51
52 ; (A) Before jumping to Interrupt Vector, hardware micro-ops did following:
53 ; 1. SP auto-switched to kernel mode stack
54 ; 2. STATUS32.Z flag set if in U mode at time of interrupt (U:1,K:0)
55 ; 3. Auto save: (mandatory) Push PC and STAT32 on stack
56 ; hardware does even if CONFIG_ARC_IRQ_NO_AUTOSAVE
57 ; 4. Auto save: (optional) r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI
58 ;
59 ; (B) Manually saved some regs: r12,r25,r30, sp,fp,gp, ACCL pair
60
61#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
62 ; carve pt_regs on stack (case #3), PC/STAT32 already on stack
63 sub sp, sp, SZ_PT_REGS - 8
64
65 __SAVE_REGFILE_HARD
66#else
67 ; carve pt_regs on stack (case #4), which grew partially already
68 sub sp, sp, PT_r0
69#endif
70
71 __SAVE_REGFILE_SOFT
72.endm
73
74
75.macro EXCEPTION_PROLOGUE
76
77 ; (A) Before jumping to Exception Vector, hardware micro-ops did following:
78 ; 1. SP auto-switched to kernel mode stack
79 ; 2. STATUS32.Z flag set if in U mode at time of exception (U:1,K:0)
80 ;
81 ; (B) Manually save the complete reg file below
82
83 sub sp, sp, SZ_PT_REGS ; carve pt_regs
84
85 ; _HARD saves r10 clobbered by _SOFT as scratch hence comes first
86
87 __SAVE_REGFILE_HARD
88 __SAVE_REGFILE_SOFT
89
90 st r0, [sp] ; orig_r0
91
92 lr r10, [eret]
93 lr r11, [erstatus]
94 ST2 r10, r11, PT_ret
95
96 lr r10, [ecr]
97 lr r11, [erbta]
98 ST2 r10, r11, PT_event
99
100 ; OUTPUT: r10 has ECR expected by EV_Trap
101.endm
102
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108
109.macro __SAVE_REGFILE_HARD
110
111 ST2 r0, r1, PT_r0
112 ST2 r2, r3, PT_r2
113 ST2 r4, r5, PT_r4
114 ST2 r6, r7, PT_r6
115 ST2 r8, r9, PT_r8
116 ST2 r10, r11, PT_r10
117
118 st blink, [sp, PT_blink]
119
120 lr r10, [lp_end]
121 lr r11, [lp_start]
122 ST2 r10, r11, PT_lpe
123
124 st lp_count, [sp, PT_lpc]
125
126 ; skip JLI, LDI, EI for now
127.endm
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135
136.macro __SAVE_REGFILE_SOFT
137
138 ST2 gp, fp, PT_r26 ; gp (r26), fp (r27)
139
140 st r12, [sp, PT_sp + 4]
141 st r30, [sp, PT_sp + 8]
142
143 ; Saving pt_regs->sp correctly requires some extra work due to the way
144 ; Auto stack switch works
145 ; - U mode: retrieve it from AUX_USER_SP
146 ; - K mode: add the offset from current SP where H/w starts auto push
147 ;
148 ; 1. Utilize the fact that Z bit is set if Intr taken in U mode
149 ; 2. Upon entry SP is always saved (for any inspection, unwinding etc),
150 ; but on return, restored only if U mode
151
152 lr r10, [AUX_USER_SP] ; U mode SP
153
154 ; ISA requires ADD.nz to have same dest and src reg operands
155 mov.nz r10, sp
156 add.nz r10, r10, SZ_PT_REGS ; K mode SP
157
158 st r10, [sp, PT_sp] ; SP (pt_regs->sp)
159
160#ifdef CONFIG_ARC_CURR_IN_REG
161 st r25, [sp, PT_user_r25]
162 GET_CURR_TASK_ON_CPU r25
163#endif
164
165#ifdef CONFIG_ARC_HAS_ACCL_REGS
166 ST2 r58, r59, PT_r58
167#endif
168
169
170 DSP_SAVE_REGFILE_IRQ
171.endm
172
173
174.macro __RESTORE_REGFILE_SOFT
175
176 LD2 gp, fp, PT_r26 ; gp (r26), fp (r27)
177
178 ld r12, [sp, PT_r12]
179 ld r30, [sp, PT_r30]
180
181 ; Restore SP (into AUX_USER_SP) only if returning to U mode
182 ; - for K mode, it will be implicitly restored as stack is unwound
183 ; - Z flag set on K is inverse of what hardware does on interrupt entry
184 ; but that doesn't really matter
185 bz 1f
186
187 ld r10, [sp, PT_sp] ; SP (pt_regs->sp)
188 sr r10, [AUX_USER_SP]
1891:
190
191#ifdef CONFIG_ARC_CURR_IN_REG
192 ld r25, [sp, PT_user_r25]
193#endif
194
195
196 DSP_RESTORE_REGFILE_IRQ
197
198#ifdef CONFIG_ARC_HAS_ACCL_REGS
199 LD2 r58, r59, PT_r58
200#endif
201.endm
202
203
204.macro __RESTORE_REGFILE_HARD
205
206 ld blink, [sp, PT_blink]
207
208 LD2 r10, r11, PT_lpe
209 sr r10, [lp_end]
210 sr r11, [lp_start]
211
212 ld r10, [sp, PT_lpc] ; lp_count can't be target of LD
213 mov lp_count, r10
214
215 LD2 r0, r1, PT_r0
216 LD2 r2, r3, PT_r2
217 LD2 r4, r5, PT_r4
218 LD2 r6, r7, PT_r6
219 LD2 r8, r9, PT_r8
220 LD2 r10, r11, PT_r10
221.endm
222
223
224
225.macro INTERRUPT_EPILOGUE
226
227 ; INPUT: r0 has STAT32 of calling context
228 ; INPUT: Z flag set if returning to K mode
229
230 ; _SOFT clobbers r10 restored by _HARD hence the order
231
232 __RESTORE_REGFILE_SOFT
233
234#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
235 __RESTORE_REGFILE_HARD
236
237 ; SP points to PC/STAT32: hw restores them despite NO_AUTOSAVE
238 add sp, sp, SZ_PT_REGS - 8
239#else
240 add sp, sp, PT_r0
241#endif
242
243.endm
244
245
246.macro EXCEPTION_EPILOGUE
247
248 ; INPUT: r0 has STAT32 of calling context
249
250 btst r0, STATUS_U_BIT ; Z flag set if K, used in restoring SP
251
252 ld r10, [sp, PT_event + 4]
253 sr r10, [erbta]
254
255 LD2 r10, r11, PT_ret
256 sr r10, [eret]
257 sr r11, [erstatus]
258
259 __RESTORE_REGFILE_SOFT
260 __RESTORE_REGFILE_HARD
261
262 add sp, sp, SZ_PT_REGS
263.endm
264
265.macro FAKE_RET_FROM_EXCPN
266 lr r9, [status32]
267 bic r9, r9, STATUS_AE_MASK
268 or r9, r9, STATUS_IE_MASK
269 kflag r9
270.endm
271
272
273.macro GET_CURR_THR_INFO_FROM_SP reg
274 bmskn \reg, sp, THREAD_SHIFT - 1
275.endm
276
277
278.macro GET_CPU_ID reg
279 lr \reg, [identity]
280 xbfu \reg, \reg, 0xE8
281
282.endm
283
284#endif
285
