[mirror_ubuntu-hirsute-kernel.git] / arch / m68k / include / asm / entry_no.h

#ifndef __M68KNOMMU_ENTRY_H
#define __M68KNOMMU_ENTRY_H

#include <asm/setup.h>
#include <asm/page.h>

/*
 * Stack layout in 'ret_from_exception':
 *
 * This allows access to the syscall arguments in registers d1-d5
 *
 *	 0(sp) - d1
 *	 4(sp) - d2
 *	 8(sp) - d3
 *	 C(sp) - d4
 *	10(sp) - d5
 *	14(sp) - a0
 *	18(sp) - a1
 *	1C(sp) - a2
 *	20(sp) - d0
 *	24(sp) - orig_d0
 *	28(sp) - stack adjustment
 *	2C(sp) - [ sr              ] [ format & vector ]
 *	2E(sp) - [ pc-hiword       ] [ sr              ]
 *	30(sp) - [ pc-loword       ] [ pc-hiword       ]
 *	32(sp) - [ format & vector ] [ pc-loword       ]
 *		  ^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^
 *			M68K		  COLDFIRE
 */

#define ALLOWINT (~0x700)

#ifdef __ASSEMBLY__

#define SWITCH_STACK_SIZE (6*4+4)	/* Includes return address */

/*
 * This defines the normal kernel pt-regs layout.
 *
 * regs are a2-a6 and d6-d7 preserved by C code
 * the kernel doesn't mess with usp unless it needs to
 */

#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
/*
 * This is made a little more tricky on older ColdFires. There is no
 * separate supervisor and user stack pointers. Need to artificially
 * construct a usp in software... When doing this we need to disable
 * interrupts, otherwise bad things will happen.
 */
.globl sw_usp
.globl sw_ksp

.macro SAVE_ALL
	move	#0x2700,%sr		/* disable intrs */
	btst	#5,%sp@(2)		/* from user? */
	bnes	6f			/* no, skip */
	movel	%sp,sw_usp		/* save user sp */
	addql	#8,sw_usp		/* remove exception */
	movel	sw_ksp,%sp		/* kernel sp */
	subql	#8,%sp			/* room for exception */
	clrl	%sp@-			/* stkadj */
	movel	%d0,%sp@-		/* orig d0 */
	movel	%d0,%sp@-		/* d0 */
	lea	%sp@(-32),%sp		/* space for 8 regs */
	moveml	%d1-%d5/%a0-%a2,%sp@
	movel	sw_usp,%a0		/* get usp */
	movel	%a0@-,%sp@(PT_OFF_PC)	/* copy exception program counter */
	movel	%a0@-,%sp@(PT_OFF_FORMATVEC)/*copy exception format/vector/sr */
	bra	7f
	6:
	clrl	%sp@-			/* stkadj */
	movel	%d0,%sp@-		/* orig d0 */
	movel	%d0,%sp@-		/* d0 */
	lea	%sp@(-32),%sp		/* space for 8 regs */
	moveml	%d1-%d5/%a0-%a2,%sp@
	7:
.endm

.macro RESTORE_USER
	move	#0x2700,%sr		/* disable intrs */
	movel	sw_usp,%a0		/* get usp */
	movel	%sp@(PT_OFF_PC),%a0@-	/* copy exception program counter */
	movel	%sp@(PT_OFF_FORMATVEC),%a0@-/*copy exception format/vector/sr */
	moveml	%sp@,%d1-%d5/%a0-%a2
	lea	%sp@(32),%sp		/* space for 8 regs */
	movel	%sp@+,%d0
	addql	#4,%sp			/* orig d0 */
	addl	%sp@+,%sp		/* stkadj */
	addql	#8,%sp			/* remove exception */
	movel	%sp,sw_ksp		/* save ksp */
	subql	#8,sw_usp		/* set exception */
	movel	sw_usp,%sp		/* restore usp */
	rte
.endm

.macro RDUSP
	movel	sw_usp,%a2
.endm

.macro WRUSP
	movel	%a0,sw_usp
.endm

#else /* !CONFIG_COLDFIRE_SW_A7 */
/*
 * Modern ColdFire parts have separate supervisor and user stack
 * pointers. Simple load and restore macros for this case.
 */
.macro SAVE_ALL
	move	#0x2700,%sr		/* disable intrs */
	clrl	%sp@-			/* stkadj */
	movel	%d0,%sp@-		/* orig d0 */
	movel	%d0,%sp@-		/* d0 */
	lea	%sp@(-32),%sp		/* space for 8 regs */
	moveml	%d1-%d5/%a0-%a2,%sp@
.endm

.macro RESTORE_USER
	moveml	%sp@,%d1-%d5/%a0-%a2
	lea	%sp@(32),%sp		/* space for 8 regs */
	movel	%sp@+,%d0
	addql	#4,%sp			/* orig d0 */
	addl	%sp@+,%sp		/* stkadj */
	rte
.endm

.macro RDUSP
	/*move	%usp,%a2*/
	.word	0x4e6a
.endm

.macro WRUSP
	/*move	%a0,%usp*/
	.word	0x4e60
.endm

#endif /* !CONFIG_COLDFIRE_SW_A7 */

.macro SAVE_SWITCH_STACK
	lea	%sp@(-24),%sp		/* 6 regs */
	moveml	%a3-%a6/%d6-%d7,%sp@
.endm

.macro RESTORE_SWITCH_STACK
	moveml	%sp@,%a3-%a6/%d6-%d7
	lea	%sp@(24),%sp		/* 6 regs */
.endm

#else /* !CONFIG_COLDFIRE */

/*
 * Standard 68k interrupt entry and exit macros.
 */
.macro SAVE_ALL
	clrl	%sp@-			/* stkadj */
	movel	%d0,%sp@-		/* orig d0 */
	movel	%d0,%sp@-		/* d0 */
	moveml	%d1-%d5/%a0-%a2,%sp@-
.endm

.macro RESTORE_ALL
	moveml	%sp@+,%a0-%a2/%d1-%d5
	movel	%sp@+,%d0
	addql	#4,%sp			/* orig d0 */
	addl	%sp@+,%sp		/* stkadj */
	rte
.endm

.macro SAVE_SWITCH_STACK
	moveml	%a3-%a6/%d6-%d7,%sp@-
.endm

.macro RESTORE_SWITCH_STACK
	moveml	%sp@+,%a3-%a6/%d6-%d7
.endm

#endif /* !COLDFIRE_SW_A7 */
#endif /* __ASSEMBLY__ */
#endif /* __M68KNOMMU_ENTRY_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __M68KNOMMU_ENTRY_H
	2	#define __M68KNOMMU_ENTRY_H
	3
1da177e4 LT	4	#include <asm/setup.h>
	5	#include <asm/page.h>
	6
	7	/*
	8	* Stack layout in 'ret_from_exception':
	9	*
	10	* This allows access to the syscall arguments in registers d1-d5
	11	*
	12	* 0(sp) - d1
	13	* 4(sp) - d2
	14	* 8(sp) - d3
	15	* C(sp) - d4
	16	* 10(sp) - d5
	17	* 14(sp) - a0
	18	* 18(sp) - a1
	19	* 1C(sp) - a2
	20	* 20(sp) - d0
	21	* 24(sp) - orig_d0
	22	* 28(sp) - stack adjustment
	23	* 2C(sp) - [ sr ] [ format & vector ]
	24	* 2E(sp) - [ pc-hiword ] [ sr ]
	25	* 30(sp) - [ pc-loword ] [ pc-hiword ]
	26	* 32(sp) - [ format & vector ] [ pc-loword ]
	27	* ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^
	28	* M68K COLDFIRE
	29	*/
	30
df9ee292	31	#define ALLOWINT (~0x700)
1da177e4 LT	32
	33	#ifdef __ASSEMBLY__
	34
1da177e4 LT	35	#define SWITCH_STACK_SIZE (64+4) / Includes return address */
	36
	37	/*
	38	* This defines the normal kernel pt-regs layout.
	39	*
	40	* regs are a2-a6 and d6-d7 preserved by C code
	41	* the kernel doesn't mess with usp unless it needs to
	42	*/
	43
	44	#ifdef CONFIG_COLDFIRE
1c83af5f	45	#ifdef CONFIG_COLDFIRE_SW_A7
1da177e4	46	/*
1c83af5f GU	47	* This is made a little more tricky on older ColdFires. There is no
1c83af5f GU	48	* separate supervisor and user stack pointers. Need to artificially
1da177e4	49	* construct a usp in software... When doing this we need to disable
1c83af5f	50	* interrupts, otherwise bad things will happen.
1da177e4	51	*/
1c83af5f GU	52	.globl sw_usp
	53	.globl sw_ksp
	54
1da177e4 LT	55	.macro SAVE_ALL
	56	move #0x2700,%sr /* disable intrs */
	57	btst #5,%sp@(2) /* from user? */
	58	bnes 6f /* no, skip */
	59	movel %sp,sw_usp /* save user sp */
	60	addql #8,sw_usp /* remove exception */
	61	movel sw_ksp,%sp /* kernel sp */
	62	subql #8,%sp /* room for exception */
	63	clrl %sp@- /* stkadj */
	64	movel %d0,%sp@- /* orig d0 */
	65	movel %d0,%sp@- /* d0 */
	66	lea %sp@(-32),%sp /* space for 8 regs */
	67	moveml %d1-%d5/%a0-%a2,%sp@
	68	movel sw_usp,%a0 /* get usp */
f159ee78 HC	69	movel %a0@-,%sp@(PT_OFF_PC) /* copy exception program counter */
f159ee78 HC	70	movel %a0@-,%sp@(PT_OFF_FORMATVEC)/copy exception format/vector/sr /
1da177e4 LT	71	bra 7f
	72	6:
	73	clrl %sp@- /* stkadj */
	74	movel %d0,%sp@- /* orig d0 */
	75	movel %d0,%sp@- /* d0 */
	76	lea %sp@(-32),%sp /* space for 8 regs */
	77	moveml %d1-%d5/%a0-%a2,%sp@
	78	7:
	79	.endm
	80
1c83af5f	81	.macro RESTORE_USER
1da177e4 LT	82	move #0x2700,%sr /* disable intrs */
1da177e4 LT	83	movel sw_usp,%a0 /* get usp */
f159ee78 HC	84	movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */
f159ee78 HC	85	movel %sp@(PT_OFF_FORMATVEC),%a0@-/copy exception format/vector/sr /
1da177e4 LT	86	moveml %sp@,%d1-%d5/%a0-%a2
	87	lea %sp@(32),%sp /* space for 8 regs */
	88	movel %sp@+,%d0
	89	addql #4,%sp /* orig d0 */
	90	addl %sp@+,%sp /* stkadj */
	91	addql #8,%sp /* remove exception */
	92	movel %sp,sw_ksp /* save ksp */
	93	subql #8,sw_usp /* set exception */
	94	movel sw_usp,%sp /* restore usp */
	95	rte
1da177e4 LT	96	.endm
1da177e4 LT	97
1c83af5f GU	98	.macro RDUSP
	99	movel sw_usp,%a2
	100	.endm
	101
	102	.macro WRUSP
	103	movel %a0,sw_usp
	104	.endm
	105
	106	#else /* !CONFIG_COLDFIRE_SW_A7 */
1da177e4	107	/*
1c83af5f GU	108	* Modern ColdFire parts have separate supervisor and user stack
1c83af5f GU	109	* pointers. Simple load and restore macros for this case.
1da177e4	110	*/
1c83af5f	111	.macro SAVE_ALL
1da177e4 LT	112	move #0x2700,%sr /* disable intrs */
	113	clrl %sp@- /* stkadj */
	114	movel %d0,%sp@- /* orig d0 */
	115	movel %d0,%sp@- /* d0 */
	116	lea %sp@(-32),%sp /* space for 8 regs */
	117	moveml %d1-%d5/%a0-%a2,%sp@
	118	.endm
	119
1c83af5f	120	.macro RESTORE_USER
1da177e4 LT	121	moveml %sp@,%d1-%d5/%a0-%a2
	122	lea %sp@(32),%sp /* space for 8 regs */
	123	movel %sp@+,%d0
	124	addql #4,%sp /* orig d0 */
	125	addl %sp@+,%sp /* stkadj */
	126	rte
	127	.endm
	128
1c83af5f GU	129	.macro RDUSP
	130	/move %usp,%a2/
	131	.word 0x4e6a
	132	.endm
	133
	134	.macro WRUSP
	135	/move %a0,%usp/
	136	.word 0x4e60
	137	.endm
	138
	139	#endif /* !CONFIG_COLDFIRE_SW_A7 */
	140
1da177e4 LT	141	.macro SAVE_SWITCH_STACK
	142	lea %sp@(-24),%sp /* 6 regs */
	143	moveml %a3-%a6/%d6-%d7,%sp@
	144	.endm
	145
	146	.macro RESTORE_SWITCH_STACK
	147	moveml %sp@,%a3-%a6/%d6-%d7
	148	lea %sp@(24),%sp /* 6 regs */
	149	.endm
	150
1da177e4 LT	151	#else /* !CONFIG_COLDFIRE */
	152
	153	/*
	154	* Standard 68k interrupt entry and exit macros.
	155	*/
	156	.macro SAVE_ALL
	157	clrl %sp@- /* stkadj */
	158	movel %d0,%sp@- /* orig d0 */
	159	movel %d0,%sp@- /* d0 */
	160	moveml %d1-%d5/%a0-%a2,%sp@-
	161	.endm
	162
	163	.macro RESTORE_ALL
	164	moveml %sp@+,%a0-%a2/%d1-%d5
	165	movel %sp@+,%d0
	166	addql #4,%sp /* orig d0 */
	167	addl %sp@+,%sp /* stkadj */
	168	rte
	169	.endm
	170
	171	.macro SAVE_SWITCH_STACK
	172	moveml %a3-%a6/%d6-%d7,%sp@-
	173	.endm
	174
	175	.macro RESTORE_SWITCH_STACK
	176	moveml %sp@+,%a3-%a6/%d6-%d7
	177	.endm
	178
1c83af5f	179	#endif /* !COLDFIRE_SW_A7 */
1da177e4 LT	180	#endif /* __ASSEMBLY__ */
1da177e4 LT	181	#endif /* __M68KNOMMU_ENTRY_H */