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wdenkd62589d2002-08-20 21:10:12 +00001/*
2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * This file contains all the macros and symbols which define
26 * a PowerPC assembly language environment.
27 */
28#ifndef __PPC_ASM_TMPL__
29#define __PPC_ASM_TMPL__
30
31/***************************************************************************
32 *
33 * These definitions simplify the ugly declarations necessary for GOT
34 * definitions.
35 *
36 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
37 *
38 * Uses r14 to access the GOT
39 */
40
41#define START_GOT \
42 .section ".got2","aw"; \
43.LCTOC1 = .+32768
44
45#define END_GOT \
46 .text
47
48#define GET_GOT \
49 bl 1f ; \
50 .text 2 ; \
510: .long .LCTOC1-1f ; \
52 .text ; \
531: mflr r14 ; \
54 lwz r0,0b-1b(r14) ; \
55 add r14,r0,r14 ;
56
57#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
58
59#define GOT(NAME) .L_ ## NAME (r14)
60
61
62/***************************************************************************
63 * Register names
64 */
65#define r0 0
66#define r1 1
67#define r2 2
68#define r3 3
69#define r4 4
70#define r5 5
71#define r6 6
72#define r7 7
73#define r8 8
74#define r9 9
75#define r10 10
76#define r11 11
77#define r12 12
78#define r13 13
79#define r14 14
80#define r15 15
81#define r16 16
82#define r17 17
83#define r18 18
84#define r19 19
85#define r20 20
86#define r21 21
87#define r22 22
88#define r23 23
89#define r24 24
90#define r25 25
91#define r26 26
92#define r27 27
93#define r28 28
94#define r29 29
95#define r30 30
96#define r31 31
97
98
99#if defined(CONFIG_8xx) || defined(CONFIG_MPC824X)
100
101/* Some special registers */
102
103#define ICR 148 /* Interrupt Cause Register (37-44) */
104#define DER 149
105#define COUNTA 150 /* Breakpoint Counter (37-44) */
106#define COUNTB 151 /* Breakpoint Counter (37-44) */
107#define LCTRL1 156 /* Load/Store Support (37-40) */
108#define LCTRL2 157 /* Load/Store Support (37-41) */
109#define ICTRL 158
110
111#endif /* CONFIG_8xx, CONFIG_MPC824X */
112
wdenk0db5bca2003-03-31 17:27:09 +0000113
114#if defined(CONFIG_5xx)
115/* Some special purpose registers */
116#define DER 149 /* Debug Enable Register */
117#define COUNTA 150 /* Breakpoint Counter */
118#define COUNTB 151 /* Breakpoint Counter */
119#define LCTRL1 156 /* Load/Store Support */
120#define LCTRL2 157 /* Load/Store Support */
121#define ICTRL 158 /* I-Bus Support Control Register */
122#define EID 81
123#endif /* CONFIG_5xx */
124
wdenkd62589d2002-08-20 21:10:12 +0000125#if defined(CONFIG_8xx)
126
127/* Registers in the processor's internal memory map that we use.
128*/
129#define SYPCR 0x00000004
130#define BR0 0x00000100
131#define OR0 0x00000104
132#define BR1 0x00000108
133#define OR1 0x0000010c
134#define BR2 0x00000110
135#define OR2 0x00000114
136#define BR3 0x00000118
137#define OR3 0x0000011c
138#define BR4 0x00000120
139#define OR4 0x00000124
140
141#define MAR 0x00000164
142#define MCR 0x00000168
143#define MAMR 0x00000170
144#define MBMR 0x00000174
145#define MSTAT 0x00000178
146#define MPTPR 0x0000017a
147#define MDR 0x0000017c
148
149#define TBSCR 0x00000200
150#define TBREFF0 0x00000204
151
152#define PLPRCR 0x00000284
153
154#elif defined(CONFIG_8260)
155
156#define HID2 1011
157
158#define HID0_IFEM (1<<7)
159
160#define HID0_ICE_BITPOS 16
161#define HID0_DCE_BITPOS 17
162
163#define IM_REGBASE 0x10000
164#define IM_SYPCR (IM_REGBASE+0x0004)
165#define IM_SWSR (IM_REGBASE+0x000e)
166#define IM_BR0 (IM_REGBASE+0x0100)
167#define IM_OR0 (IM_REGBASE+0x0104)
168#define IM_BR1 (IM_REGBASE+0x0108)
169#define IM_OR1 (IM_REGBASE+0x010c)
170#define IM_BR2 (IM_REGBASE+0x0110)
171#define IM_OR2 (IM_REGBASE+0x0114)
172#define IM_MPTPR (IM_REGBASE+0x0184)
173#define IM_PSDMR (IM_REGBASE+0x0190)
174#define IM_PSRT (IM_REGBASE+0x019c)
175#define IM_IMMR (IM_REGBASE+0x01a8)
176#define IM_SCCR (IM_REGBASE+0x0c80)
177
wdenk983fda82004-10-28 00:09:35 +0000178#elif defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8220)
wdenk945af8d2003-07-16 21:53:01 +0000179
180#define HID0_ICE_BITPOS 16
181#define HID0_DCE_BITPOS 17
182
wdenkd62589d2002-08-20 21:10:12 +0000183#endif
184
185#define curptr r2
186
187#define SYNC \
188 sync; \
189 isync
190
191/*
192 * Macros for storing registers into and loading registers from
193 * exception frames.
194 */
195#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
196#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
197#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
198#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
199#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
200#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
201#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
202#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
203#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
204#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
205
206/*
207 * GCC sometimes accesses words at negative offsets from the stack
208 * pointer, although the SysV ABI says it shouldn't. To cope with
209 * this, we leave this much untouched space on the stack on exception
210 * entry.
211 */
212#define STACK_UNDERHEAD 64
213
214/*
215 * Exception entry code. This code runs with address translation
216 * turned off, i.e. using physical addresses.
217 * We assume sprg3 has the physical address of the current
218 * task's thread_struct.
219 */
220#define EXCEPTION_PROLOG \
221 mtspr SPRG0,r20; \
222 mtspr SPRG1,r21; \
223 mfcr r20; \
224 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
225 stw r20,_CCR(r21); /* save registers */ \
226 stw r22,GPR22(r21); \
227 stw r23,GPR23(r21); \
228 mfspr r20,SPRG0; \
229 stw r20,GPR20(r21); \
230 mfspr r22,SPRG1; \
231 stw r22,GPR21(r21); \
232 mflr r20; \
233 stw r20,_LINK(r21); \
234 mfctr r22; \
235 stw r22,_CTR(r21); \
236 mfspr r20,XER; \
237 stw r20,_XER(r21); \
238 mfspr r22,SRR0; \
239 mfspr r23,SRR1; \
240 stw r0,GPR0(r21); \
241 stw r1,GPR1(r21); \
242 stw r2,GPR2(r21); \
243 stw r1,0(r21); \
244 mr r1,r21; /* set new kernel sp */ \
245 SAVE_4GPRS(3, r21);
246/*
247 * Note: code which follows this uses cr0.eq (set if from kernel),
248 * r21, r22 (SRR0), and r23 (SRR1).
249 */
250
251/*
252 * Critical exception entry code. This is just like the other exception
253 * code except that it uses SRR2 and SRR3 instead of SRR0 and SRR1.
254 */
255#define CRITICAL_EXCEPTION_PROLOG \
wdenk8bde7f72003-06-27 21:31:46 +0000256 mtspr SPRG0,r20; \
257 mtspr SPRG1,r21; \
258 mfcr r20; \
259 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
260 stw r20,_CCR(r21); /* save registers */ \
261 stw r22,GPR22(r21); \
262 stw r23,GPR23(r21); \
263 mfspr r20,SPRG0; \
264 stw r20,GPR20(r21); \
265 mfspr r22,SPRG1; \
266 stw r22,GPR21(r21); \
267 mflr r20; \
268 stw r20,_LINK(r21); \
269 mfctr r22; \
270 stw r22,_CTR(r21); \
271 mfspr r20,XER; \
272 stw r20,_XER(r21); \
273 mfspr r22,990; /* SRR2 */ \
274 mfspr r23,991; /* SRR3 */ \
275 stw r0,GPR0(r21); \
276 stw r1,GPR1(r21); \
277 stw r2,GPR2(r21); \
278 stw r1,0(r21); \
279 mr r1,r21; /* set new kernel sp */ \
280 SAVE_4GPRS(3, r21);
wdenkd62589d2002-08-20 21:10:12 +0000281/*
282 * Note: code which follows this uses cr0.eq (set if from kernel),
283 * r21, r22 (SRR2), and r23 (SRR3).
284 */
285
286/*
287 * Exception vectors.
288 *
289 * The data words for `hdlr' and `int_return' are initialized with
290 * OFFSET values only; they must be relocated first before they can
291 * be used!
292 */
293#define STD_EXCEPTION(n, label, hdlr) \
294 . = n; \
295label: \
296 EXCEPTION_PROLOG; \
297 lwz r3,GOT(transfer_to_handler); \
298 mtlr r3; \
299 addi r3,r1,STACK_FRAME_OVERHEAD; \
300 li r20,MSR_KERNEL; \
301 rlwimi r20,r23,0,25,25; \
302 blrl ; \
303.L_ ## label : \
304 .long hdlr - _start + EXC_OFF_SYS_RESET; \
305 .long int_return - _start + EXC_OFF_SYS_RESET
306
307
308#define CRIT_EXCEPTION(n, label, hdlr) \
wdenk8bde7f72003-06-27 21:31:46 +0000309 . = n; \
wdenkd62589d2002-08-20 21:10:12 +0000310label: \
wdenk8bde7f72003-06-27 21:31:46 +0000311 CRITICAL_EXCEPTION_PROLOG; \
312 lwz r3,GOT(transfer_to_handler); \
313 mtlr r3; \
314 addi r3,r1,STACK_FRAME_OVERHEAD; \
315 li r20,MSR_KERNEL; \
316 rlwimi r20,r23,0,25,25; \
317 blrl ; \
wdenkd62589d2002-08-20 21:10:12 +0000318.L_ ## label : \
wdenk8bde7f72003-06-27 21:31:46 +0000319 .long hdlr - _start + EXC_OFF_SYS_RESET; \
320 .long crit_return - _start + EXC_OFF_SYS_RESET
wdenkd62589d2002-08-20 21:10:12 +0000321
322#endif /* __PPC_ASM_TMPL__ */