[people/ms/u-boot.git] / include / ppc_asm.tmpl

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * This file contains all the macros and symbols which define
 * a PowerPC assembly language environment.
 */
#ifndef	__PPC_ASM_TMPL__
#define __PPC_ASM_TMPL__

#include <config.h>

/***************************************************************************
 *
 * These definitions simplify the ugly declarations necessary for GOT
 * definitions.
 *
 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
 *
 * Uses r12 to access the GOT
 */

#define START_GOT			\
	.section	".got2","aw";	\
.LCTOC1 = .+32768

#define END_GOT				\
	.text

#define GET_GOT				\
	bl	1f		;	\
	.text	2		;	\
0:	.long	.LCTOC1-1f	;	\
	.text			;	\
1:	mflr	r12		;	\
	lwz	r0,0b-1b(r12)	;	\
	add	r12,r0,r12	;

#define GOT_ENTRY(NAME)		.L_ ## NAME = . - .LCTOC1 ; .long NAME

#define GOT(NAME)		.L_ ## NAME (r12)


/***************************************************************************
 * Register names
 */
#define	r0	0
#define	r1	1
#define	r2	2
#define	r3	3
#define	r4	4
#define	r5	5
#define	r6	6
#define	r7	7
#define	r8	8
#define	r9	9
#define	r10	10
#define	r11	11
#define	r12	12
#define	r13	13
#define	r14	14
#define	r15	15
#define	r16	16
#define	r17	17
#define	r18	18
#define	r19	19
#define	r20	20
#define	r21	21
#define	r22	22
#define	r23	23
#define	r24	24
#define	r25	25
#define	r26	26
#define	r27	27
#define	r28	28
#define	r29	29
#define	r30	30
#define	r31	31

#if defined(CONFIG_MPC5xxx)

#define HID0_ICE_BITPOS	16
#define HID0_DCE_BITPOS	17

#endif

#define curptr r2

#define SYNC \
	sync; \
	isync

/*
 * Macros for storing registers into and loading registers from
 * exception frames.
 */
#define SAVE_GPR(n, base)	stw	n,GPR0+4*(n)(base)
#define SAVE_2GPRS(n, base)	SAVE_GPR(n, base); SAVE_GPR(n+1, base)
#define SAVE_4GPRS(n, base)	SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
#define SAVE_8GPRS(n, base)	SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
#define SAVE_10GPRS(n, base)	SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
#define REST_GPR(n, base)	lwz	n,GPR0+4*(n)(base)
#define REST_2GPRS(n, base)	REST_GPR(n, base); REST_GPR(n+1, base)
#define REST_4GPRS(n, base)	REST_2GPRS(n, base); REST_2GPRS(n+2, base)
#define REST_8GPRS(n, base)	REST_4GPRS(n, base); REST_4GPRS(n+4, base)
#define REST_10GPRS(n, base)	REST_8GPRS(n, base); REST_2GPRS(n+8, base)

/*
 * GCC sometimes accesses words at negative offsets from the stack
 * pointer, although the SysV ABI says it shouldn't.  To cope with
 * this, we leave this much untouched space on the stack on exception
 * entry.
 */
#define STACK_UNDERHEAD	64

/*
 * Exception entry code.  This code runs with address translation
 * turned off, i.e. using physical addresses.
 * We assume sprg3 has the physical address of the current
 * task's thread_struct.
 */
#define EXCEPTION_PROLOG(reg1, reg2)	\
	mtspr	SPRG0,r20;	\
	mtspr	SPRG1,r21;	\
	mfcr	r20;		\
	subi	r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD;	/* alloc exc. frame */\
	stw	r20,_CCR(r21);		/* save registers */ \
	stw	r22,GPR22(r21);	\
	stw	r23,GPR23(r21);	\
	mfspr	r20,SPRG0;	\
	stw	r20,GPR20(r21);	\
	mfspr	r22,SPRG1;	\
	stw	r22,GPR21(r21);	\
	mflr	r20;		\
	stw	r20,_LINK(r21);	\
	mfctr	r22;		\
	stw	r22,_CTR(r21);	\
	mfspr	r20,XER;	\
	stw	r20,_XER(r21);	\
	mfspr	r20, DAR_DEAR;	\
	stw	r20,_DAR(r21);	\
	mfspr	r22,reg1;	\
	mfspr	r23,reg2;	\
	stw	r0,GPR0(r21);	\
	stw	r1,GPR1(r21);	\
	stw	r2,GPR2(r21);	\
	stw	r1,0(r21);	\
	mr	r1,r21;			/* set new kernel sp */	\
	SAVE_4GPRS(3, r21);
/*
 * Note: code which follows this uses cr0.eq (set if from kernel),
 * r21, r22 (SRR0), and r23 (SRR1).
 */

/*
 * Exception vectors.
 *
 * The data words for `hdlr' and `int_return' are initialized with
 * OFFSET values only; they must be relocated first before they can
 * be used!
 */
#define COPY_EE(d, s)		rlwimi d,s,0,16,16
#define NOCOPY(d, s)

#ifdef CONFIG_E500
#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee)	\
	stw	r22,_NIP(r21);				\
	stw	r23,_MSR(r21);				\
	li	r23,n;					\
	stw	r23,TRAP(r21);				\
	li	r20,msr;				\
	copyee(r20,r23);				\
	rlwimi	r20,r23,0,25,25;			\
	mtmsr	r20;					\
	bl	1f;					\
1:	mflr	r23;					\
	addis	r23,r23,(hdlr - 1b)@ha;			\
	addi	r23,r23,(hdlr - 1b)@l;			\
	b	transfer_to_handler

#define STD_EXCEPTION(n, label, hdlr)				\
.align 4;							\
label:								\
	EXCEPTION_PROLOG(SRR0, SRR1);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY)	\

#define CRIT_EXCEPTION(n, label, hdlr)				\
.align 4;							\
label:								\
	EXCEPTION_PROLOG(CSRR0, CSRR1);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(n, label, hdlr,			\
	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\

#define MCK_EXCEPTION(n, label, hdlr)				\
.align 4;							\
label:								\
	EXCEPTION_PROLOG(MCSRR0, MCSRR1);			\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(n, label, hdlr,			\
	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\

#else	/* !E500 */

#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee)	\
	bl	1f;					\
1:	mflr    r20;					\
	lwz	r20,(.L_ ## label)-1b+8(r20);		\
	mtlr	r20;					\
	li	r20,msr;				\
	copyee(r20,r23);				\
	rlwimi	r20,r23,0,25,25;			\
	blrl;						\
.L_ ## label :						\
	.long	hdlr - _start + _START_OFFSET;		\
	.long	int_return - _start + _START_OFFSET;	\
	.long	transfer_to_handler - _start + _START_OFFSET

#define STD_EXCEPTION(n, label, hdlr)				\
	. = n;							\
label:								\
	EXCEPTION_PROLOG(SRR0, SRR1);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY)	\

#define CRIT_EXCEPTION(n, label, hdlr)				\
	. = n;							\
label:								\
	EXCEPTION_PROLOG(CSRR0, CSRR1);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(label, hdlr,				\
	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\

#define MCK_EXCEPTION(n, label, hdlr)				\
	. = n;							\
label:								\
	EXCEPTION_PROLOG(MCSRR0, MCSRR1);			\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(label, hdlr,				\
	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\

#endif	/* !E500 */
#endif	/* __PPC_ASM_TMPL__ */
Commit	Line	Data
d62589d5 WD	1	/*
	2	* (C) Copyright 2000-2002
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
d62589d5 WD	6	*/
	7
	8	/*
	9	* This file contains all the macros and symbols which define
	10	* a PowerPC assembly language environment.
	11	*/
	12	#ifndef __PPC_ASM_TMPL__
	13	#define __PPC_ASM_TMPL__
	14
96d2bb95 SW	15	#include <config.h>
96d2bb95 SW	16
d62589d5 WD	17	/***************************************************************************
	18	*
	19	* These definitions simplify the ugly declarations necessary for GOT
	20	* definitions.
	21	*
	22	* Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
	23	*
161e4ae4	24	* Uses r12 to access the GOT
d62589d5 WD	25	*/
	26
	27	#define START_GOT \
	28	.section ".got2","aw"; \
	29	.LCTOC1 = .+32768
	30
	31	#define END_GOT \
	32	.text
	33
	34	#define GET_GOT \
	35	bl 1f ; \
	36	.text 2 ; \
	37	0: .long .LCTOC1-1f ; \
	38	.text ; \
0f8aa159 JT	39	1: mflr r12 ; \
	40	lwz r0,0b-1b(r12) ; \
	41	add r12,r0,r12 ;
d62589d5 WD	42
	43	#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
	44
0f8aa159	45	#define GOT(NAME) .L_ ## NAME (r12)
d62589d5 WD	46
	47
	48	/***************************************************************************
	49	* Register names
	50	*/
	51	#define r0 0
	52	#define r1 1
	53	#define r2 2
	54	#define r3 3
	55	#define r4 4
	56	#define r5 5
	57	#define r6 6
	58	#define r7 7
	59	#define r8 8
	60	#define r9 9
	61	#define r10 10
	62	#define r11 11
	63	#define r12 12
	64	#define r13 13
	65	#define r14 14
	66	#define r15 15
	67	#define r16 16
	68	#define r17 17
	69	#define r18 18
	70	#define r19 19
	71	#define r20 20
	72	#define r21 21
	73	#define r22 22
	74	#define r23 23
	75	#define r24 24
	76	#define r25 25
	77	#define r26 26
	78	#define r27 27
	79	#define r28 28
	80	#define r29 29
	81	#define r30 30
	82	#define r31 31
	83
2eb48ff7	84	#if defined(CONFIG_MPC5xxx)
945af8d7 WD	85
	86	#define HID0_ICE_BITPOS 16
	87	#define HID0_DCE_BITPOS 17
	88
d62589d5 WD	89	#endif
	90
	91	#define curptr r2
	92
	93	#define SYNC \
	94	sync; \
	95	isync
	96
	97	/*
	98	* Macros for storing registers into and loading registers from
	99	* exception frames.
	100	*/
	101	#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
	102	#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
	103	#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
	104	#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
	105	#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
	106	#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
	107	#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
	108	#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
	109	#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
	110	#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
	111
	112	/*
	113	* GCC sometimes accesses words at negative offsets from the stack
	114	* pointer, although the SysV ABI says it shouldn't. To cope with
	115	* this, we leave this much untouched space on the stack on exception
	116	* entry.
	117	*/
	118	#define STACK_UNDERHEAD 64
	119
	120	/*
	121	* Exception entry code. This code runs with address translation
	122	* turned off, i.e. using physical addresses.
	123	* We assume sprg3 has the physical address of the current
	124	* task's thread_struct.
	125	*/
efa35cf1	126	#define EXCEPTION_PROLOG(reg1, reg2) \
d62589d5 WD	127	mtspr SPRG0,r20; \
	128	mtspr SPRG1,r21; \
	129	mfcr r20; \
	130	subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
	131	stw r20,_CCR(r21); /* save registers */ \
	132	stw r22,GPR22(r21); \
	133	stw r23,GPR23(r21); \
	134	mfspr r20,SPRG0; \
	135	stw r20,GPR20(r21); \
	136	mfspr r22,SPRG1; \
	137	stw r22,GPR21(r21); \
	138	mflr r20; \
	139	stw r20,_LINK(r21); \
	140	mfctr r22; \
	141	stw r22,_CTR(r21); \
	142	mfspr r20,XER; \
	143	stw r20,_XER(r21); \
cc3023b9	144	mfspr r20, DAR_DEAR; \
efa35cf1 GB	145	stw r20,_DAR(r21); \
	146	mfspr r22,reg1; \
	147	mfspr r23,reg2; \
d62589d5 WD	148	stw r0,GPR0(r21); \
	149	stw r1,GPR1(r21); \
	150	stw r2,GPR2(r21); \
	151	stw r1,0(r21); \
	152	mr r1,r21; /* set new kernel sp */ \
	153	SAVE_4GPRS(3, r21);
	154	/*
	155	* Note: code which follows this uses cr0.eq (set if from kernel),
	156	* r21, r22 (SRR0), and r23 (SRR1).
	157	*/
	158
d62589d5 WD	159	/*
	160	* Exception vectors.
	161	*
	162	* The data words for `hdlr' and `int_return' are initialized with
	163	* OFFSET values only; they must be relocated first before they can
	164	* be used!
	165	*/
fc4e1887 JT	166	#define COPY_EE(d, s) rlwimi d,s,0,16,16
fc4e1887 JT	167	#define NOCOPY(d, s)
96d2bb95 SW	168
	169	#ifdef CONFIG_E500
	170	#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \
	171	stw r22,_NIP(r21); \
	172	stw r23,_MSR(r21); \
	173	li r23,n; \
	174	stw r23,TRAP(r21); \
	175	li r20,msr; \
	176	copyee(r20,r23); \
	177	rlwimi r20,r23,0,25,25; \
	178	mtmsr r20; \
	179	bl 1f; \
	180	1: mflr r23; \
	181	addis r23,r23,(hdlr - 1b)@ha; \
	182	addi r23,r23,(hdlr - 1b)@l; \
	183	b transfer_to_handler
	184
	185	#define STD_EXCEPTION(n, label, hdlr) \
50689461	186	.align 4; \
96d2bb95 SW	187	label: \
	188	EXCEPTION_PROLOG(SRR0, SRR1); \
	189	addi r3,r1,STACK_FRAME_OVERHEAD; \
	190	EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \
	191
	192	#define CRIT_EXCEPTION(n, label, hdlr) \
50689461	193	.align 4; \
96d2bb95 SW	194	label: \
	195	EXCEPTION_PROLOG(CSRR0, CSRR1); \
	196	addi r3,r1,STACK_FRAME_OVERHEAD; \
	197	EXC_XFER_TEMPLATE(n, label, hdlr, \
	198	MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE), NOCOPY) \
	199
	200	#define MCK_EXCEPTION(n, label, hdlr) \
50689461	201	.align 4; \
96d2bb95 SW	202	label: \
	203	EXCEPTION_PROLOG(MCSRR0, MCSRR1); \
	204	addi r3,r1,STACK_FRAME_OVERHEAD; \
	205	EXC_XFER_TEMPLATE(n, label, hdlr, \
	206	MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE), NOCOPY) \
	207
	208	#else /* !E500 */
	209
fc4e1887 JT	210	#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \
	211	bl 1f; \
	212	1: mflr r20; \
	213	lwz r20,(.L_ ## label)-1b+8(r20); \
	214	mtlr r20; \
	215	li r20,msr; \
	216	copyee(r20,r23); \
d62589d5	217	rlwimi r20,r23,0,25,25; \
83b4cfa3	218	blrl; \
d62589d5	219	.L_ ## label : \
efa35cf1	220	.long hdlr - _start + _START_OFFSET; \
fc4e1887 JT	221	.long int_return - _start + _START_OFFSET; \
	222	.long transfer_to_handler - _start + _START_OFFSET
	223
	224	#define STD_EXCEPTION(n, label, hdlr) \
	225	. = n; \
	226	label: \
	227	EXCEPTION_PROLOG(SRR0, SRR1); \
	228	addi r3,r1,STACK_FRAME_OVERHEAD; \
	229	EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \
efa35cf1 GB	230
efa35cf1 GB	231	#define CRIT_EXCEPTION(n, label, hdlr) \
83b4cfa3	232	. = n; \
efa35cf1	233	label: \
02032e8f	234	EXCEPTION_PROLOG(CSRR0, CSRR1); \
83b4cfa3	235	addi r3,r1,STACK_FRAME_OVERHEAD; \
fc4e1887 JT	236	EXC_XFER_TEMPLATE(label, hdlr, \
fc4e1887 JT	237	MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE), NOCOPY) \
efa35cf1	238
efa35cf1	239	#define MCK_EXCEPTION(n, label, hdlr) \
83b4cfa3	240	. = n; \
efa35cf1	241	label: \
83b4cfa3	242	EXCEPTION_PROLOG(MCSRR0, MCSRR1); \
83b4cfa3	243	addi r3,r1,STACK_FRAME_OVERHEAD; \
fc4e1887 JT	244	EXC_XFER_TEMPLATE(label, hdlr, \
fc4e1887 JT	245	MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE), NOCOPY) \
d62589d5	246
96d2bb95	247	#endif /* !E500 */
d62589d5	248	#endif /* __PPC_ASM_TMPL__ */