aboutsummaryrefslogtreecommitdiffstats
path: root/arch/h8300/platform/h8300h/entry.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/h8300/platform/h8300h/entry.S')
-rw-r--r--arch/h8300/platform/h8300h/entry.S333
1 files changed, 333 insertions, 0 deletions
diff --git a/arch/h8300/platform/h8300h/entry.S b/arch/h8300/platform/h8300h/entry.S
new file mode 100644
index 000000000000..2052dbb9483f
--- /dev/null
+++ b/arch/h8300/platform/h8300h/entry.S
@@ -0,0 +1,333 @@
1/* -*- mode: asm -*-
2 *
3 * linux/arch/h8300/platform/h8300h/entry.S
4 *
5 * Yoshinori Sato <ysato@users.sourceforge.jp>
6 * David McCullough <davidm@snapgear.com>
7 *
8 */
9
10/*
11 * entry.S
12 * include exception/interrupt gateway
13 * system call entry
14 */
15
16#include <linux/sys.h>
17#include <linux/config.h>
18#include <asm/unistd.h>
19#include <asm/setup.h>
20#include <asm/segment.h>
21#include <asm/linkage.h>
22#include <asm/asm-offsets.h>
23#include <asm/thread_info.h>
24#include <asm/errno.h>
25
26 .h8300h
27
28/* CPU context save/restore macros. */
29
30 .macro SAVE_ALL
31 mov.l er0,@-sp
32
33 stc ccr,r0l /* check kernel mode */
34 orc #0x10,ccr
35 btst #4,r0l
36 bne 5f
37
38 mov.l sp,@SYMBOL_NAME(sw_usp) /* user mode */
39 mov.l @sp,er0
40 mov.l @SYMBOL_NAME(sw_ksp),sp
41 sub.l #(LRET-LORIG),sp /* allocate LORIG - LRET */
42 mov.l er0,@-sp
43 mov.l er1,@-sp
44 mov.l @SYMBOL_NAME(sw_usp),er0
45 mov.l @(8:16,er0),er1 /* copy the RET addr */
46 mov.l er1,@(LRET-LER1:16,sp)
47
48 mov.w e1,r1 /* e1 highbyte = ccr */
49 and #0xef,r1h /* mask mode? flag */
50 sub.w r0,r0
51 mov.b r1h,r0l
52 mov.w r0,@(LCCR-LER1:16,sp) /* copy ccr */
53 mov.l @(LORIG-LER1:16,sp),er0
54 mov.l er0,@(LER0-LER1:16,sp) /* copy ER0 */
55 bra 6f
565:
57 mov.l @sp,er0 /* kernel mode */
58 subs #2,sp /* dummy ccr */
59 mov.l er0,@-sp
60 mov.l er1,@-sp
61 mov.w @(LRET-LER1:16,sp),r1 /* copy old ccr */
62 mov.b r1h,r1l
63 mov.b #0,r1h
64 mov.w r1,@(LCCR-LER1:16,sp) /* set ccr */
656:
66 mov.l er2,@-sp
67 mov.l er3,@-sp
68 mov.l er6,@-sp /* syscall arg #6 */
69 mov.l er5,@-sp /* syscall arg #5 */
70 mov.l er4,@-sp /* syscall arg #4 */
71 .endm
72
73 .macro RESTORE_ALL
74 mov.l @sp+,er4
75 mov.l @sp+,er5
76 mov.l @sp+,er6
77 mov.l @sp+,er3
78 mov.l @sp+,er2
79 mov.w @(LCCR-LER1:16,sp),r0 /* check kernel mode */
80 btst #4,r0l
81 bne 7f
82
83 orc #0x80,ccr
84 mov.l @SYMBOL_NAME(sw_usp),er0
85 mov.l @(LER0-LER1:16,sp),er1 /* restore ER0 */
86 mov.l er1,@er0
87 mov.w @(LCCR-LER1:16,sp),r1 /* restore the RET addr */
88 mov.b r1l,r1h
89 mov.b @(LRET+1-LER1:16,sp),r1l
90 mov.w r1,e1
91 mov.w @(LRET+2-LER1:16,sp),r1
92 mov.l er1,@(8:16,er0)
93
94 mov.l @sp+,er1
95 add.l #(LRET-LER1),sp /* remove LORIG - LRET */
96 mov.l sp,@SYMBOL_NAME(sw_ksp)
97 mov.l er0,sp
98 bra 8f
997:
100 mov.l @sp+,er1
101 adds #4,sp
102 adds #2,sp
1038:
104 mov.l @sp+,er0
105 adds #4,sp /* remove the sw created LVEC */
106 rte
107 .endm
108
109.globl SYMBOL_NAME(system_call)
110.globl SYMBOL_NAME(ret_from_exception)
111.globl SYMBOL_NAME(ret_from_fork)
112.globl SYMBOL_NAME(ret_from_interrupt)
113.globl SYMBOL_NAME(interrupt_redirect_table)
114.globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
115.globl SYMBOL_NAME(resume)
116.globl SYMBOL_NAME(interrupt_redirect_table)
117.globl SYMBOL_NAME(interrupt_entry)
118.globl SYMBOL_NAME(system_call)
119.globl SYMBOL_NAME(trace_break)
120
121#if defined(CONFIG_ROMKERNEL)
122INTERRUPTS = 64
123 .section .int_redirect,"ax"
124SYMBOL_NAME_LABEL(interrupt_redirect_table)
125 .rept 7
126 .long 0
127 .endr
128 jsr @SYMBOL_NAME(interrupt_entry) /* NMI */
129 jmp @SYMBOL_NAME(system_call) /* TRAPA #0 (System call) */
130 .long 0
131 .long 0
132 jmp @SYMBOL_NAME(trace_break) /* TRAPA #3 (breakpoint) */
133 .rept INTERRUPTS-12
134 jsr @SYMBOL_NAME(interrupt_entry)
135 .endr
136#endif
137#if defined(CONFIG_RAMKERNEL)
138.globl SYMBOL_NAME(interrupt_redirect_table)
139 .section .bss
140SYMBOL_NAME_LABEL(interrupt_redirect_table)
141 .space 4
142#endif
143
144 .section .text
145 .align 2
146SYMBOL_NAME_LABEL(interrupt_entry)
147 SAVE_ALL
148 mov.w @(LCCR,sp),r0
149 btst #4,r0l
150 bne 1f
151 mov.l @SYMBOL_NAME(sw_usp),er0
152 mov.l @(4:16,er0),er0
153 bra 2f
1541:
155 mov.l @(LVEC,sp),er0
1562:
157#if defined(CONFIG_ROMKERNEL)
158 sub.l #SYMBOL_NAME(interrupt_redirect_table),er0
159#endif
160#if defined(CONFIG_RAMKERNEL)
161 mov.l @SYMBOL_NAME(interrupt_redirect_table),er1
162 sub.l er1,er0
163#endif
164 shlr.l er0
165 shlr.l er0
166 dec.l #1,er0
167 mov.l sp,er1
168 subs #4,er1 /* adjust ret_pc */
169 jsr @SYMBOL_NAME(process_int)
170 mov.l @SYMBOL_NAME(irq_stat)+CPUSTAT_SOFTIRQ_PENDING,er0
171 beq 1f
172 jsr @SYMBOL_NAME(do_softirq)
1731:
174 jmp @SYMBOL_NAME(ret_from_interrupt)
175
176SYMBOL_NAME_LABEL(system_call)
177 subs #4,sp /* dummy LVEC */
178 SAVE_ALL
179 mov.w @(LCCR:16,sp),r1
180 bset #4,r1l
181 ldc r1l,ccr
182 mov.l er0,er4
183 mov.l #-ENOSYS,er0
184 mov.l er0,@(LER0:16,sp)
185
186 /* save top of frame */
187 mov.l sp,er0
188 jsr @SYMBOL_NAME(set_esp0)
189 cmp.l #NR_syscalls,er4
190 bcc SYMBOL_NAME(ret_from_exception):16
191 shll.l er4
192 shll.l er4
193 mov.l #SYMBOL_NAME(sys_call_table),er0
194 add.l er4,er0
195 mov.l @er0,er4
196 beq SYMBOL_NAME(ret_from_exception):16
197 mov.l sp,er2
198 and.w #0xe000,r2
199 mov.b @((TASK_FLAGS+3-(TIF_SYSCALL_TRACE >> 3)):16,er2),r2l
200 btst #(TIF_SYSCALL_TRACE & 7),r2l
201 bne 1f
202 mov.l @(LER1:16,sp),er0
203 mov.l @(LER2:16,sp),er1
204 mov.l @(LER3:16,sp),er2
205 jsr @er4
206 mov.l er0,@(LER0:16,sp) /* save the return value */
207#if defined(CONFIG_SYSCALL_PRINT)
208 jsr @SYMBOL_NAME(syscall_print)
209#endif
210 bra SYMBOL_NAME(ret_from_exception):8
2111:
212 jsr SYMBOL_NAME(syscall_trace)
213 mov.l @(LER1:16,sp),er0
214 mov.l @(LER2:16,sp),er1
215 mov.l @(LER3:16,sp),er2
216 jsr @er4
217 mov.l er0,@(LER0:16,sp) /* save the return value */
218 jsr @SYMBOL_NAME(syscall_trace)
219 bra SYMBOL_NAME(ret_from_exception):8
220
221SYMBOL_NAME_LABEL(ret_from_fork)
222 mov.l er2,er0
223 jsr @SYMBOL_NAME(schedule_tail)
224 bra SYMBOL_NAME(ret_from_exception):8
225
226SYMBOL_NAME_LABEL(reschedule)
227 /* save top of frame */
228 mov.l sp,er0
229 jsr @SYMBOL_NAME(set_esp0)
230 jsr @SYMBOL_NAME(schedule)
231
232SYMBOL_NAME_LABEL(ret_from_exception)
233#if defined(CONFIG_PREEMPT)
234 orc #0x80,ccr
235#endif
236SYMBOL_NAME_LABEL(ret_from_interrupt)
237 mov.b @(LCCR+1:16,sp),r0l
238 btst #4,r0l /* check if returning to kernel */
239 bne done:8 /* if so, skip resched, signals */
240 andc #0x7f,ccr
241 mov.l sp,er4
242 and.w #0xe000,r4
243 mov.l @(TI_FLAGS:16,er4),er1
244 and.l #_TIF_WORK_MASK,er1
245 beq done:8
2461:
247 mov.l @(TI_FLAGS:16,er4),er1
248 btst #TIF_NEED_RESCHED,r1l
249 bne SYMBOL_NAME(reschedule):16
250 mov.l sp,er0
251 subs #4,er0 /* adjust retpc */
252 mov.l er2,er1
253 jsr @SYMBOL_NAME(do_signal)
254#if defined(CONFIG_PREEMPT)
255 bra done:8 /* userspace thoru */
2563:
257 btst #4,r0l
258 beq done:8 /* userspace thoru */
2594:
260 mov.l @(TI_PRE_COUNT:16,er4),er1
261 bne done:8
262 mov.l @(TI_FLAGS:16,er4),er1
263 btst #TIF_NEED_RESCHED,r1l
264 beq done:8
265 mov.b r0l,r0l
266 bpl done:8 /* interrupt off (exception path?) */
267 mov.l #PREEMPT_ACTIVE,er1
268 mov.l er1,@(TI_PRE_COUNT:16,er4)
269 andc #0x7f,ccr
270 jsr @SYMBOL_NAME(schedule)
271 sub.l er1,er1
272 mov.l er1,@(TI_PRE_COUNT:16,er4)
273 orc #0x80,ccr
274 bra 4b:8
275#endif
276done:
277 RESTORE_ALL /* Does RTE */
278
279SYMBOL_NAME_LABEL(resume)
280 /*
281 * Beware - when entering resume, offset of tss is in d1,
282 * prev (the current task) is in a0, next (the new task)
283 * is in a1 and d2.b is non-zero if the mm structure is
284 * shared between the tasks, so don't change these
285 * registers until their contents are no longer needed.
286 */
287
288 /* save sr */
289 sub.w r3,r3
290 stc ccr,r3l
291 mov.w r3,@(THREAD_CCR+2:16,er0)
292
293 /* disable interrupts */
294 orc #0x80,ccr
295 mov.l @SYMBOL_NAME(sw_usp),er3
296 mov.l er3,@(THREAD_USP:16,er0)
297 mov.l sp,@(THREAD_KSP:16,er0)
298
299 /* Skip address space switching if they are the same. */
300 /* FIXME: what did we hack out of here, this does nothing! */
301
302 mov.l @(THREAD_USP:16,er1),er0
303 mov.l er0,@SYMBOL_NAME(sw_usp)
304 mov.l @(THREAD_KSP:16,er1),sp
305
306 /* restore status register */
307 mov.w @(THREAD_CCR+2:16,er1),r3
308
309 ldc r3l,ccr
310 rts
311
312SYMBOL_NAME_LABEL(trace_break)
313 subs #4,sp
314 SAVE_ALL
315 sub.l er1,er1
316 dec.l #1,er1
317 mov.l er1,@(LORIG,sp)
318 mov.l sp,er0
319 jsr @SYMBOL_NAME(set_esp0)
320 mov.l @SYMBOL_NAME(sw_usp),er0
321 mov.l @er0,er1
322 subs #2,er1
323 mov.l er1,@er0
324 and.w #0xff,e1
325 mov.l er1,er0
326 jsr @SYMBOL_NAME(trace_trap)
327 jmp @SYMBOL_NAME(ret_from_exception)
328
329 .section .bss
330SYMBOL_NAME_LABEL(sw_ksp)
331 .space 4
332SYMBOL_NAME_LABEL(sw_usp)
333 .space 4
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-03 17:49:22 -0500