1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * (C) Copyright 2000-2002
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7/*
8 * This file contains all the macros and symbols which define
9 * a PowerPC assembly language environment.
10 */
11#ifndef	__PPC_ASM_TMPL__
12#define __PPC_ASM_TMPL__
13
14#include <config.h>
15
16/***************************************************************************
17 *
18 * These definitions simplify the ugly declarations necessary for GOT
19 * definitions.
20 *
21 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
22 *
23 * Uses r12 to access the GOT
24 */
25
26#define START_GOT			\
27	.section	".got2","aw";	\
28.LCTOC1 = .+32768
29
30#define END_GOT				\
31	.text
32
33#define GET_GOT				\
34	bl	1f		;	\
35	.text	2		;	\
360:	.long	.LCTOC1-1f	;	\
37	.text			;	\
381:	mflr	r12		;	\
39	lwz	r0,0b-1b(r12)	;	\
40	add	r12,r0,r12	;
41
42#define GOT_ENTRY(NAME)		.L_ ## NAME = . - .LCTOC1 ; .long NAME
43
44#define GOT(NAME)		.L_ ## NAME (r12)
45
46
47/***************************************************************************
48 * Register names
49 */
50#define	r0	0
51#define	r1	1
52#define	r2	2
53#define	r3	3
54#define	r4	4
55#define	r5	5
56#define	r6	6
57#define	r7	7
58#define	r8	8
59#define	r9	9
60#define	r10	10
61#define	r11	11
62#define	r12	12
63#define	r13	13
64#define	r14	14
65#define	r15	15
66#define	r16	16
67#define	r17	17
68#define	r18	18
69#define	r19	19
70#define	r20	20
71#define	r21	21
72#define	r22	22
73#define	r23	23
74#define	r24	24
75#define	r25	25
76#define	r26	26
77#define	r27	27
78#define	r28	28
79#define	r29	29
80#define	r30	30
81#define	r31	31
82
83#if defined(CONFIG_MPC8xx)
84
85/* Some special registers */
86
87#define ICR	148	/* Interrupt Cause Register (37-44) */
88#define DER	149
89#define COUNTA	150	/* Breakpoint Counter	    (37-44) */
90#define COUNTB	151	/* Breakpoint Counter	    (37-44) */
91#define LCTRL1	156	/* Load/Store Support	    (37-40) */
92#define LCTRL2	157	/* Load/Store Support	    (37-41) */
93#define ICTRL	158
94
95#endif	/* CONFIG_MPC8xx */
96
97
98#if defined(CONFIG_MPC8xx)
99
100/* Registers in the processor's internal memory map that we use.
101*/
102#define SYPCR	0x00000004
103#define BR0	0x00000100
104#define OR0	0x00000104
105#define BR1	0x00000108
106#define OR1	0x0000010c
107#define BR2	0x00000110
108#define OR2	0x00000114
109#define BR3	0x00000118
110#define OR3	0x0000011c
111#define BR4	0x00000120
112#define OR4	0x00000124
113
114#define MAR	0x00000164
115#define MCR	0x00000168
116#define MAMR	0x00000170
117#define MBMR	0x00000174
118#define MSTAT	0x00000178
119#define MPTPR	0x0000017a
120#define MDR	0x0000017c
121
122#define TBSCR	0x00000200
123#define TBREFF0	0x00000204
124
125#define PLPRCR	0x00000284
126
127#endif
128
129#define curptr r2
130
131#define SYNC \
132	sync; \
133	isync
134
135/*
136 * Macros for storing registers into and loading registers from
137 * exception frames.
138 */
139#define SAVE_GPR(n, base)	stw	n,GPR0+4*(n)(base)
140#define SAVE_2GPRS(n, base)	SAVE_GPR(n, base); SAVE_GPR(n+1, base)
141#define SAVE_4GPRS(n, base)	SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
142#define SAVE_8GPRS(n, base)	SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
143#define SAVE_10GPRS(n, base)	SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
144#define REST_GPR(n, base)	lwz	n,GPR0+4*(n)(base)
145#define REST_2GPRS(n, base)	REST_GPR(n, base); REST_GPR(n+1, base)
146#define REST_4GPRS(n, base)	REST_2GPRS(n, base); REST_2GPRS(n+2, base)
147#define REST_8GPRS(n, base)	REST_4GPRS(n, base); REST_4GPRS(n+4, base)
148#define REST_10GPRS(n, base)	REST_8GPRS(n, base); REST_2GPRS(n+8, base)
149
150/*
151 * GCC sometimes accesses words at negative offsets from the stack
152 * pointer, although the SysV ABI says it shouldn't.  To cope with
153 * this, we leave this much untouched space on the stack on exception
154 * entry.
155 */
156#define STACK_UNDERHEAD	64
157
158/*
159 * Exception entry code.  This code runs with address translation
160 * turned off, i.e. using physical addresses.
161 * We assume sprg3 has the physical address of the current
162 * task's thread_struct.
163 */
164#define EXCEPTION_PROLOG(reg1, reg2)	\
165	mtspr	SPRG0,r20;	\
166	mtspr	SPRG1,r21;	\
167	mfcr	r20;		\
168	subi	r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD;	/* alloc exc. frame */\
169	stw	r20,_CCR(r21);		/* save registers */ \
170	stw	r22,GPR22(r21);	\
171	stw	r23,GPR23(r21);	\
172	mfspr	r20,SPRG0;	\
173	stw	r20,GPR20(r21);	\
174	mfspr	r22,SPRG1;	\
175	stw	r22,GPR21(r21);	\
176	mflr	r20;		\
177	stw	r20,_LINK(r21);	\
178	mfctr	r22;		\
179	stw	r22,_CTR(r21);	\
180	mfspr	r20,XER;	\
181	stw	r20,_XER(r21);	\
182	mfspr	r20, DAR_DEAR;	\
183	stw	r20,_DAR(r21);	\
184	mfspr	r22,reg1;	\
185	mfspr	r23,reg2;	\
186	stw	r0,GPR0(r21);	\
187	stw	r1,GPR1(r21);	\
188	stw	r2,GPR2(r21);	\
189	stw	r1,0(r21);	\
190	mr	r1,r21;			/* set new kernel sp */	\
191	SAVE_4GPRS(3, r21);
192/*
193 * Note: code which follows this uses cr0.eq (set if from kernel),
194 * r21, r22 (SRR0), and r23 (SRR1).
195 */
196
197/*
198 * Exception vectors.
199 *
200 * The data words for `hdlr' and `int_return' are initialized with
201 * OFFSET values only; they must be relocated first before they can
202 * be used!
203 */
204#define COPY_EE(d, s)		rlwimi d,s,0,16,16
205#define NOCOPY(d, s)
206
207#ifdef CONFIG_E500
208#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee)	\
209	stw	r22,_NIP(r21);				\
210	stw	r23,_MSR(r21);				\
211	li	r23,n;					\
212	stw	r23,TRAP(r21);				\
213	li	r20,msr;				\
214	copyee(r20,r23);				\
215	rlwimi	r20,r23,0,25,25;			\
216	mtmsr	r20;					\
217	bl	1f;					\
2181:	mflr	r23;					\
219	addis	r23,r23,(hdlr - 1b)@ha;			\
220	addi	r23,r23,(hdlr - 1b)@l;			\
221	b	transfer_to_handler
222
223#define STD_EXCEPTION(n, label, hdlr)				\
224.align 4;							\
225label:								\
226	EXCEPTION_PROLOG(SRR0, SRR1);				\
227	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
228	EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY)	\
229
230#define CRIT_EXCEPTION(n, label, hdlr)				\
231.align 4;							\
232label:								\
233	EXCEPTION_PROLOG(CSRR0, CSRR1);				\
234	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
235	EXC_XFER_TEMPLATE(n, label, hdlr,			\
236	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
237
238#define MCK_EXCEPTION(n, label, hdlr)				\
239.align 4;							\
240label:								\
241	EXCEPTION_PROLOG(MCSRR0, MCSRR1);			\
242	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
243	EXC_XFER_TEMPLATE(n, label, hdlr,			\
244	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
245
246#else	/* !E500 */
247
248#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee)	\
249	bl	1f;					\
2501:	mflr    r20;					\
251	lwz	r20,(.L_ ## label)-1b+8(r20);		\
252	mtlr	r20;					\
253	li	r20,msr;				\
254	copyee(r20,r23);				\
255	rlwimi	r20,r23,0,25,25;			\
256	blrl;						\
257.L_ ## label :						\
258	.long	hdlr - _start + _START_OFFSET;		\
259	.long	int_return - _start + _START_OFFSET;	\
260	.long	transfer_to_handler - _start + _START_OFFSET
261
262#define STD_EXCEPTION(n, label, hdlr)				\
263	. = n;							\
264label:								\
265	EXCEPTION_PROLOG(SRR0, SRR1);				\
266	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
267	EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY)	\
268
269#define CRIT_EXCEPTION(n, label, hdlr)				\
270	. = n;							\
271label:								\
272	EXCEPTION_PROLOG(CSRR0, CSRR1);				\
273	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
274	EXC_XFER_TEMPLATE(label, hdlr,				\
275	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
276
277#define MCK_EXCEPTION(n, label, hdlr)				\
278	. = n;							\
279label:								\
280	EXCEPTION_PROLOG(MCSRR0, MCSRR1);			\
281	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
282	EXC_XFER_TEMPLATE(label, hdlr,				\
283	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
284
285#endif	/* !E500 */
286#endif	/* __PPC_ASM_TMPL__ */
287