[mirror_ubuntu-artful-kernel.git] / include / asm-m68knommu / entry.h

#ifndef __M68KNOMMU_ENTRY_H
#define __M68KNOMMU_ENTRY_H

#include <linux/config.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 0xf8ff

#ifdef __ASSEMBLY__

/* process bits for task_struct.flags */
PF_TRACESYS_OFF = 3
PF_TRACESYS_BIT = 5
PF_PTRACED_OFF = 3
PF_PTRACED_BIT = 4
PF_DTRACE_OFF = 1
PF_DTRACE_BIT = 5

LENOSYS = 38

#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
/*
 * This is made a little more tricky on the ColdFire. There is no
 * separate kernel and user stack pointers. Need to artificially
 * construct a usp in software... When doing this we need to disable
 * interrupts, otherwise bad things could happen.
 */
.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_PC)	/* copy exception program counter */
	movel	%a0@-,%sp@(PT_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_ALL
	btst	#5,%sp@(PT_SR)		/* going user? */
	bnes	8f			/* no, skip */
	move	#0x2700,%sr		/* disable intrs */
	movel	sw_usp,%a0		/* get usp */
	movel	%sp@(PT_PC),%a0@-	/* copy exception program counter */
	movel	%sp@(PT_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
	8:
	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

/*
 * Quick exception save, use current stack only.
 */
.macro SAVE_LOCAL
	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_LOCAL
	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 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

/*
 * Software copy of the user and kernel stack pointers... Ugh...
 * Need these to get around ColdFire not having separate kernel
 * and user stack pointers.
 */
.globl sw_usp
.globl sw_ksp

#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 /* !CONFIG_COLDFIRE */
#endif /* __ASSEMBLY__ */
#endif /* __M68KNOMMU_ENTRY_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __M68KNOMMU_ENTRY_H
	2	#define __M68KNOMMU_ENTRY_H
	3
	4	#include <linux/config.h>
	5	#include <asm/setup.h>
	6	#include <asm/page.h>
	7
	8	/*
	9	* Stack layout in 'ret_from_exception':
	10	*
	11	* This allows access to the syscall arguments in registers d1-d5
	12	*
	13	* 0(sp) - d1
	14	* 4(sp) - d2
	15	* 8(sp) - d3
	16	* C(sp) - d4
	17	* 10(sp) - d5
	18	* 14(sp) - a0
	19	* 18(sp) - a1
	20	* 1C(sp) - a2
	21	* 20(sp) - d0
	22	* 24(sp) - orig_d0
	23	* 28(sp) - stack adjustment
	24	* 2C(sp) - [ sr ] [ format & vector ]
	25	* 2E(sp) - [ pc-hiword ] [ sr ]
	26	* 30(sp) - [ pc-loword ] [ pc-hiword ]
	27	* 32(sp) - [ format & vector ] [ pc-loword ]
	28	* ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^
	29	* M68K COLDFIRE
	30	*/
	31
	32	#define ALLOWINT 0xf8ff
	33
	34	#ifdef __ASSEMBLY__
	35
	36	/* process bits for task_struct.flags */
	37	PF_TRACESYS_OFF = 3
	38	PF_TRACESYS_BIT = 5
	39	PF_PTRACED_OFF = 3
	40	PF_PTRACED_BIT = 4
	41	PF_DTRACE_OFF = 1
	42	PF_DTRACE_BIT = 5
	43
	44	LENOSYS = 38
	45
	46	#define SWITCH_STACK_SIZE (64+4) / Includes return address */
	47
	48	/*
	49	* This defines the normal kernel pt-regs layout.
	50	*
	51	* regs are a2-a6 and d6-d7 preserved by C code
	52	* the kernel doesn't mess with usp unless it needs to
	53	*/
	54
	55	#ifdef CONFIG_COLDFIRE
	56	/*
	57	* This is made a little more tricky on the ColdFire. There is no
	58	* separate kernel and user stack pointers. Need to artificially
	59	* construct a usp in software... When doing this we need to disable
	60	* interrupts, otherwise bad things could happen.
	61	*/
	62	.macro SAVE_ALL
	63	move #0x2700,%sr /* disable intrs */
	64	btst #5,%sp@(2) /* from user? */
65	bnes 6f /* no, skip */
66	movel %sp,sw_usp /* save user sp */
67	addql #8,sw_usp /* remove exception */
68	movel sw_ksp,%sp /* kernel sp */
69	subql #8,%sp /* room for exception */
70	clrl %sp@- /* stkadj */
71	movel %d0,%sp@- /* orig d0 */
72	movel %d0,%sp@- /* d0 */
73	lea %sp@(-32),%sp /* space for 8 regs */
74	moveml %d1-%d5/%a0-%a2,%sp@
75	movel sw_usp,%a0 /* get usp */
76	movel %a0@-,%sp@(PT_PC) /* copy exception program counter */
77	movel %a0@-,%sp@(PT_FORMATVEC)/* copy exception format/vector/sr */
78	bra 7f
79	6:
80	clrl %sp@- /* stkadj */
81	movel %d0,%sp@- /* orig d0 */
82	movel %d0,%sp@- /* d0 */
83	lea %sp@(-32),%sp /* space for 8 regs */
84	moveml %d1-%d5/%a0-%a2,%sp@
85	7:
86	.endm
87
88	.macro RESTORE_ALL
89	btst #5,%sp@(PT_SR) /* going user? */
90	bnes 8f /* no, skip */
91	move #0x2700,%sr /* disable intrs */
92	movel sw_usp,%a0 /* get usp */
93	movel %sp@(PT_PC),%a0@- /* copy exception program counter */
94	movel %sp@(PT_FORMATVEC),%a0@-/* copy exception format/vector/sr */
95	moveml %sp@,%d1-%d5/%a0-%a2
96	lea %sp@(32),%sp /* space for 8 regs */
97	movel %sp@+,%d0
98	addql #4,%sp /* orig d0 */
99	addl %sp@+,%sp /* stkadj */
100	addql #8,%sp /* remove exception */
101	movel %sp,sw_ksp /* save ksp */
102	subql #8,sw_usp /* set exception */
103	movel sw_usp,%sp /* restore usp */
104	rte
105	8:
106	moveml %sp@,%d1-%d5/%a0-%a2
107	lea %sp@(32),%sp /* space for 8 regs */
108	movel %sp@+,%d0
109	addql #4,%sp /* orig d0 */
110	addl %sp@+,%sp /* stkadj */
111	rte
112	.endm
113
114	/*
115	* Quick exception save, use current stack only.
116	*/
117	.macro SAVE_LOCAL
118	move #0x2700,%sr /* disable intrs */
119	clrl %sp@- /* stkadj */
120	movel %d0,%sp@- /* orig d0 */
121	movel %d0,%sp@- /* d0 */
122	lea %sp@(-32),%sp /* space for 8 regs */
123	moveml %d1-%d5/%a0-%a2,%sp@
124	.endm
125
126	.macro RESTORE_LOCAL
127	moveml %sp@,%d1-%d5/%a0-%a2
128	lea %sp@(32),%sp /* space for 8 regs */
129	movel %sp@+,%d0
130	addql #4,%sp /* orig d0 */
131	addl %sp@+,%sp /* stkadj */
132	rte
133	.endm
134
135	.macro SAVE_SWITCH_STACK
136	lea %sp@(-24),%sp /* 6 regs */
137	moveml %a3-%a6/%d6-%d7,%sp@
138	.endm
139
140	.macro RESTORE_SWITCH_STACK
141	moveml %sp@,%a3-%a6/%d6-%d7
142	lea %sp@(24),%sp /* 6 regs */
143	.endm
144
145	/*
146	* Software copy of the user and kernel stack pointers... Ugh...
147	* Need these to get around ColdFire not having separate kernel
148	* and user stack pointers.
149	*/
150	.globl sw_usp
151	.globl sw_ksp
152
153	#else /* !CONFIG_COLDFIRE */
154
155	/*
156	* Standard 68k interrupt entry and exit macros.
157	*/
158	.macro SAVE_ALL
159	clrl %sp@- /* stkadj */
160	movel %d0,%sp@- /* orig d0 */
161	movel %d0,%sp@- /* d0 */
162	moveml %d1-%d5/%a0-%a2,%sp@-
163	.endm
164
165	.macro RESTORE_ALL
166	moveml %sp@+,%a0-%a2/%d1-%d5
167	movel %sp@+,%d0
168	addql #4,%sp /* orig d0 */
169	addl %sp@+,%sp /* stkadj */
170	rte
171	.endm
172
173	.macro SAVE_SWITCH_STACK
174	moveml %a3-%a6/%d6-%d7,%sp@-
175	.endm
176
177	.macro RESTORE_SWITCH_STACK
178	moveml %sp@+,%a3-%a6/%d6-%d7
179	.endm
180
181	#endif /* !CONFIG_COLDFIRE */
182	#endif /* __ASSEMBLY__ */
183	#endif /* __M68KNOMMU_ENTRY_H */