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sim-crt0.S @ 612

Last change on this file since 612 was 444, checked in by satin@…, 6 years ago
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 10.3 KB

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1	# Copyright (c) 2003 Red Hat, Inc. All rights reserved.
2	#
3	# This copyrighted material is made available to anyone wishing to use, modify,
4	# copy, or redistribute it subject to the terms and conditions of the BSD
5	# License. This program is distributed in the hope that it will be useful,
6	# but WITHOUT ANY WARRANTY expressed or implied, including the implied
7	# warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of
8	# this license is available at http://www.opensource.org/licenses. Any Red Hat
9	# trademarks that are incorporated in the source code or documentation are not
10	# subject to the BSD License and may only be used or replicated with the express
11	# permission of Red Hat, Inc.
12	#
13	# Toshiba Media Processor startup file (crt0.S)
14	#
15	# Designed for user programs running in the 0-2Mb startup section.
16	# Designed for the simulator by default.
17	#
18	# Exception/Interrupt Handler Locations
19	# CFG.EVM CFG.EVA CFG.IVA Exception INTn
20	## 0 - - 0x0000_0000 0x0000_0030 rom
21	## 1 0 0 0x0020_0000 0x0020_0030 local RAM / local RAM
22	## 1 1 0 0x0080_0000 0x0020_0000 ext RAM / local RAM
23	## 1 0 1 0x0020_0000 0x0080_0000 local RAM / ext RAM
24	## 1 1 1 0x0080_0000 0x0080_0030 ext RAM / ext RAM
25	#
26	# Exceptions
27	# Reset 0x0000_0000
28	# NMI 0x0000_0000+4
29	# RI (Base Address) +0x08
30	# ZDIV (Base Address) +0x0C
31	# BRK (Base Address) +0x10
32	# SWI (Base Address) +0x14
33	# DSP (Base Address) +0x1C
34	# COP (Base Address) +0x20
35
36	.set _local_ram_base, 0x00200000
37	.set _ext_ram_base, 0x00800000
38	.set _int_base_offset, 0x30
39
40	#include "syscall.h"
41
42	.macro if_bitfield_zero reg, start, length, label
43	ldc $0, \reg
44	srl $0, \start
45	and3 $0, $0, (1 << \length) - 1
46	beqz $0,\label
47	.endm
48
49	.macro if_bitfield_notN reg, start, length, N, label
50	ldc $0, \reg
51	srl $0, \start
52	and3 $0, $0, (1 << \length) - 1
53	bnei $0,\N, \label
54	.endm
55
56	.macro if_bitfield_eqN reg, start, length, N, label
57	ldc $0, \reg
58	srl $0, \start
59	and3 $0, $0, (1 << \length) - 1
60	beqi $0,\N, \label
61	.endm
62
63	.macro if_bitfield_ltN reg, start, length, N, label
64	ldc $0, \reg
65	srl $0, \start
66	and3 $0, $0, (1 << \length) - 1
67	blti $0,\N, \label
68	.endm
69
70	.section .hwinit, "ax"
71	# CCFG.ICSZ
72	if_bitfield_zero reg=$ccfg, start=16, length=7, label=.Lend_enable_icache
73	__enable_icache:
74	# set ICE(cfg[1])
75	ldc $1,$cfg
76	or3 $1,$1,2
77	stc $1,$cfg
78	nop
79	nop
80	nop
81	nop
82	nop
83	.Lend_enable_icache:
84	ret
85
86	__enable_dcache:
87	# CCFG.DCSZ
88	if_bitfield_zero reg=$ccfg, start=0, length=7, label=.Lend_enable_dcache
89	# set DCE(cfg[0])
90	ldc $1,$cfg
91	or3 $1,$1,1
92	stc $1,$cfg
93	nop
94	nop
95	nop
96	nop
97	nop
98	ret
99	.Lend_enable_dcache:
100
101	.text
102
103	#ifdef NOVEC
104	.global _reset
105	_reset:
106	#endif
107
108	.global _start
109	_start:
110	mov $fp, 0 # for unwinding
111
112	# $sp set
113	movh $sp, %uhi(__stack_table)
114	or3 $sp, $sp, %lo(__stack_table)
115
116	# initialize sp, gp, tp
117	# get CPU ID
118	ldc $0, $id
119	srl $0, 16
120
121	# load ID-specific stack pointer
122	sl2ad3 $0, $0, $sp # $0 = ($0 << 2) + $sp
123	lw $sp,($0) # $sp = *($0)
124	mov $0,0xfffffff8
125	and $sp, $0
126
127	#ifndef NOVEC
128	# copy exception vector table
129
130	# RCFG.IRSZ
131	if_bitfield_zero reg=$rcfg, start=16, length=7, label=.Lend_ev_imem
132	# handle imem
133	movh $11,%uhi(_local_ram_base)
134	or3 $11,$11,%lo(_local_ram_base)
135	# clear CFG.EVA ([23])
136	ldc $0,$cfg
137	movh $1, %uhi(0xff7fffff)
138	or3 $1, $1, %lo(0xff7fffff)
139	and $0,$1
140	stc $0,$cfg
141	bra .Ldo_repeat_ev
142	.Lend_ev_imem:
143	#ifdef UseSDRAM
144	movh $11,%uhi(_ext_ram_base)
145	or3 $11,$11,%lo(_ext_ram_base)
146	# set CFG.EVA ([23])
147	ldc $0,$cfg
148	movh $1,%uhi(1<<23)
149	or3 $1,$1,%lo(1<<23)
150	or $0,$1
151	stc $0,$cfg
152	#else
153	# handle ROM
154	bra .Lend_ev
155	#endif
156	.Ldo_repeat_ev:
157	# set CFG.EVM ([4])
158	ldc $0,$cfg
159	or3 $0,$0,(1<<4)
160	stc $0,$cfg
161	# copy _exception_table to $11
162	movh $12,%uhi(_exception_table)
163	or3 $12,$12,%lo(_exception_table)
164	mov $13,8
165	repeat $13,.Lrepeat_ev
166	lw $1,0($12)
167	add $12,4
168	.Lrepeat_ev:
169	sw $1,0($11)
170	add $11,4
171	.Lend_ev:
172
173	# copy interrupt vector table
174	# RCFG.IRSZ
175	if_bitfield_zero reg=$rcfg, start=16, length=7, label=.Lend_iv_imem
176	# handle imem
177	movh $11,%uhi(_local_ram_base)
178	or3 $11,$11,%lo(_int_base_offset)
179	# clear CFG.IVA ([22])
180	ldc $0,$cfg
181	movh $1,%uhi(0xffbfffff) # ~(1<<22)
182	or3 $1,$1,%lo(0xffbfffff)
183	and $0,$1
184	stc $0,$cfg
185	bra .Ldo_repeat_iv
186	.Lend_iv_imem:
187	#ifdef UseSDRAM
188	movh $11,%uhi(_ext_ram_base)
189	or3 $11,$11,%lo(_int_base_offset)
190	# set CFG. IVA ([22])
191	ldc $0,$cfg
192	movh $1,%uhi(1<<22)
193	or3 $1,$1,%lo(1<<22)
194	or $0,$1
195	stc $0,$cfg
196	#else
197	# handle ROM
198	bra .Lend_iv
199	#endif
200	.Ldo_repeat_iv:
201	# set CFG.IVM ([3])
202	ldc $0,$cfg
203	or3 $0,$0,(1<<3)
204	stc $0,$cfg
205	# copy _interrupt_table to $11
206	movh $12,%uhi(_interrupt_table)
207	or3 $12,$12,%lo(_interrupt_table)
208	mov $13,32
209	add $13,-1
210	and3 $13,$13,127
211	repeat $13,.Lrepeat_iv
212	lw $1,0($12)
213	add $12,4
214	.Lrepeat_iv:
215	sw $1,0($11)
216	add $11,4
217	.Lend_iv:
218
219	# initialize instruction cache
220	# Icache Size CCFG.ICSZ ([22..16]) KByte
221	if_bitfield_zero reg=$ccfg, start=16, length=7, label=.Lend_ic
222	mov $3,$0 # cache size in KB
223	# ID.ID
224	if_bitfield_ltN reg=$ID, start=8, length=8, N=3, label=.Lend_mepc3_ic
225	# Line Size CCFG.ICSZ ([26..24]) Byte
226	if_bitfield_ltN reg=$ccfg, start=24, length=3, N=2, label=.Lend_ic
227	bgei $0,5,.Lend_ic
228
229	add3 $1,$0,3 # bit width of line size
230	mov $0,$3
231	# clear tag
232	mov $2,10
233	sub $2,$1
234	sll $0,$2 # *KByte/(line size)
235	add $0,-1
236	mov $2,1
237	sll $2,$1 # line size
238	bra .Ldo_repeat_icache
239	.Lend_mepc3_ic:
240	# ICache: $0 KByte
241	mov $0,$3
242	# clear tag
243	sll $0,(10-5) # *KByte/(32byte=linesize)
244	add $0,-1
245	mov $2,32
246	.Ldo_repeat_icache:
247	mov $1,0
248	bra 0f
249	# Align this code on an 8 byte boundary in order to keep the repeat
250	# loop entirely within the instruction fetch buffer.
251	.p2align 3
252	0:
253	movh $3,%hi(0x00310000) # for tag
254	repeat $0,.Lrepeat_icache
255	add $0,-1
256	.Lrepeat_icache:
257	sw $1,0($3)
258	add3 $3,$3,$2
259	.Lenable_icache:
260	movh $1,%hi(__enable_icache)
261	add3 $1,$1,%lo(__enable_icache)
262	jsr $1
263	.Lend_ic:
264
265	# initialize data cache
266	# Dcache Size CCFG.DCSZ ([6..0]) KByte
267	if_bitfield_zero reg=$ccfg, start=0, length=7, label=.Lend_dc
268	mov $3,$0 # cache size in KB
269	# ID.ID
270	if_bitfield_ltN reg=$ID, start=8, length=8, N=3, label=.Lend_mepc3_dc
271	# Line Size CCFG.DCSZ ([10..8]) Byte
272	if_bitfield_ltN reg=$ccfg, start=8, length=3, N=2, label=.Lend_dc
273	bgei $0,5,.Lend_dc
274
275	add3 $1,$0,3 # bit width of line size
276	mov $0,$3
277	# clear tag
278	mov $2,10
279	sub $2,$1
280	sll $0,$2 # *KByte/(line size)
281	add $0,-1
282	mov $2,1
283	sll $2,$1 # line size
284	bra .Ldo_repeat_dcache
285	.Lend_mepc3_dc:
286	# DCache: $0 KByte
287	mov $0,$3
288	# clear tag
289	sll $0,(10-5) # *KByte/(32byte=linesize)
290	add $0,-1
291	mov $2,32
292	.Ldo_repeat_dcache:
293	mov $1,0
294	movh $3,%hi(0x00330000) # for tag
295
296	repeat $0,.Lrepeat_dcache
297	add $0,-1
298	.Lrepeat_dcache:
299	sw $1,0($3)
300	add3 $3,$3,$2
301	.Lenable_dcache:
302	movh $1,%hi(__enable_dcache)
303	add3 $1,$1,%lo(__enable_dcache)
304	jsr $1
305	.Lend_dc:
306	# NOVEC
307	#endif
308	mov $0, 0
309
310	movh $gp, %uhi(__sdabase)
311	or3 $gp, $gp, %lo(__sdabase)
312
313	movh $tp, %uhi(__tpbase)
314	or3 $tp, $tp, %lo(__tpbase)
315
316	# zero out BSS
317	movh $1, %uhi(__bss_start)
318	or3 $1, $1, %lo(__bss_start)
319	mov $2, 0
320	movh $3, %uhi(_end)
321	or3 $3, $3, %lo(_end)
322	sub $3, $1
323	bsr memset
324
325	movh $1, %uhi(__sbss_start)
326	or3 $1, $1, %lo(__sbss_start)
327	mov $2, 0
328	movh $3, %uhi(__sbss_end)
329	or3 $3, $3, %lo(__sbss_end)
330	sub $3, $1
331	bsr memset
332
333	movh $1, %uhi(__farbss_start)
334	or3 $1, $1, %lo(__farbss_start)
335	mov $2, 0
336	movh $3, %uhi(__farbss_end)
337	or3 $3, $3, %lo(__farbss_end)
338	sub $3, $1
339	bsr memset
340
341	# enable interrupts
342	ei
343
344	# construct global class variables
345	bsr __invoke_init_section
346
347	# invoke main
348	mov $1, 0 # argc, argv, envp
349	mov $2, 0
350	mov $3, 0
351	bsr main
352	mov $1, $0
353	bsr exit
354
355	.global _exit
356	_exit:
357	# Prevent _exit recursion
358	movh $3, %uhi(_exit_in_progress)
359	or3 $3, $3, %lo(_exit_in_progress)
360	lw $5, ($3)
361	bnez $5, _skip_fini
362	mov $5, 1
363	sw $5, ($3)
364
365	# We don't need to preserve $5 because we're going to exit anyway.
366	mov $5,$1
367
368	# destruct global class variables
369	bsr __invoke_fini_section
370	mov $1,$5
371
372	_skip_fini:
373
374	#ifdef NOSIM
375	_exit_loop:
376	bra _exit_loop
377	#else
378	.2byte 0x7800 \| ((SYS_exit & 0xe) << 7) \| ((SYS_exit & 1) << 4)
379	ret
380	#endif
381
382	.data
383	_exit_in_progress: .word 0
384
385
386
387	# For these two, the epilogue is in crtn.S
388
389	.section .init
390	__invoke_init_section:
391	add $sp, -8
392	ldc $0, $lp
393	sw $0, ($sp)
394
395	.section .fini
396	__invoke_fini_section:
397	add $sp, -8
398	ldc $0, $lp
399	sw $0, ($sp)
400
401	#ifndef NOVEC
402	.section .vec, "ax"
403	.core
404	.org 0x0, 0
405	.global _exception_table
406	.type _exception_table,@function
407	_exception_table:
408	.p2align 2
409	.org 0x0000, 0
410	.global _reset
411	_reset:
412	jmp _handler_RESET
413	.org 0x0004, 0
414	jmp _handler_NMI
415	.org 0x0008, 0
416	jmp _handler_RI
417	.org 0x000c, 0
418	jmp _handler_ZDIV
419	.org 0x0010, 0
420	jmp _handler_BRK
421	.org 0x0014, 0
422	jmp _handler_SWI
423	.org 0x0018, 0
424	jmp _handler_DEBUG
425	.org 0x001c, 0
426	jmp _handler_DSP
427	.org 0x0020, 0
428	jmp _handler_COP
429
430	.org 0x30, 0
431	.global _interrupt_table
432	.type _interrupt_table,@function
433	_interrupt_table:
434	.org 0x0030
435	jmp _handler_INT0
436	.org 0x0034
437	jmp _handler_INT1
438	.org 0x0038
439	jmp _handler_INT2
440	.org 0x003c
441	jmp _handler_INT3
442	.org 0x0040
443	jmp _handler_INT4
444	.org 0x0044
445	jmp _handler_INT5
446	.org 0x0048
447	jmp _handler_INT6
448	.org 0x004c
449	jmp _handler_INT7
450	.org 0x0050
451	jmp _handler_INT8
452	.org 0x0054
453	jmp _handler_INT9
454	.org 0x0058
455	jmp _handler_INT10
456	.org 0x005c
457	jmp _handler_INT11
458	.org 0x0060
459	jmp _handler_INT12
460	.org 0x0064
461	jmp _handler_INT13
462	.org 0x0068
463	jmp _handler_INT14
464	.org 0x006c
465	jmp _handler_INT15
466	.org 0x0070
467	jmp _handler_INT16
468	.org 0x0074
469	jmp _handler_INT17
470	.org 0x0078
471	jmp _handler_INT18
472	.org 0x007c
473	jmp _handler_INT19
474	.org 0x0080
475	jmp _handler_INT20
476	.org 0x0084
477	jmp _handler_INT21
478	.org 0x0088
479	jmp _handler_INT22
480	.org 0x008c
481	jmp _handler_INT23
482	.org 0x0090
483	jmp _handler_INT24
484	.org 0x0094
485	jmp _handler_INT25
486	.org 0x0098
487	jmp _handler_INT26
488	.org 0x009c
489	jmp _handler_INT27
490	.org 0x00a0
491	jmp _handler_INT28
492	.org 0x00a4
493	jmp _handler_INT29
494	.org 0x00a8
495	jmp _handler_INT30
496	.org 0x00ac
497	jmp _handler_INT31
498	# NOVEC
499	#endif

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