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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
633ea5d7 GU |
2 | /* |
3 | * include/asm-m68k/processor.h | |
4 | * | |
5 | * Copyright (C) 1995 Hamish Macdonald | |
6 | */ | |
7 | ||
8 | #ifndef __ASM_M68K_PROCESSOR_H | |
9 | #define __ASM_M68K_PROCESSOR_H | |
10 | ||
11 | /* | |
12 | * Default implementation of macro that returns current | |
13 | * instruction pointer ("program counter"). | |
14 | */ | |
15 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
16 | ||
17 | #include <linux/thread_info.h> | |
18 | #include <asm/segment.h> | |
19 | #include <asm/fpu.h> | |
20 | #include <asm/ptrace.h> | |
21 | ||
22 | static inline unsigned long rdusp(void) | |
23 | { | |
1c83af5f | 24 | #ifdef CONFIG_COLDFIRE_SW_A7 |
633ea5d7 GU |
25 | extern unsigned int sw_usp; |
26 | return sw_usp; | |
49148020 | 27 | #else |
1c83af5f GU |
28 | register unsigned long usp __asm__("a0"); |
29 | /* move %usp,%a0 */ | |
30 | __asm__ __volatile__(".word 0x4e68" : "=a" (usp)); | |
633ea5d7 GU |
31 | return usp; |
32 | #endif | |
33 | } | |
34 | ||
35 | static inline void wrusp(unsigned long usp) | |
36 | { | |
1c83af5f | 37 | #ifdef CONFIG_COLDFIRE_SW_A7 |
633ea5d7 GU |
38 | extern unsigned int sw_usp; |
39 | sw_usp = usp; | |
40 | #else | |
1c83af5f GU |
41 | register unsigned long a0 __asm__("a0") = usp; |
42 | /* move %a0,%usp */ | |
43 | __asm__ __volatile__(".word 0x4e60" : : "a" (a0) ); | |
633ea5d7 GU |
44 | #endif |
45 | } | |
46 | ||
47 | /* | |
48 | * User space process size: 3.75GB. This is hardcoded into a few places, | |
49 | * so don't change it unless you know what you are doing. | |
50 | */ | |
cc24c405 | 51 | #ifdef CONFIG_MMU |
2c9b82ad GU |
52 | #if defined(CONFIG_COLDFIRE) |
53 | #define TASK_SIZE (0xC0000000UL) | |
54 | #elif defined(CONFIG_SUN3) | |
633ea5d7 | 55 | #define TASK_SIZE (0x0E000000UL) |
2c9b82ad GU |
56 | #else |
57 | #define TASK_SIZE (0xF0000000UL) | |
633ea5d7 | 58 | #endif |
cc24c405 GU |
59 | #else |
60 | #define TASK_SIZE (0xFFFFFFFFUL) | |
61 | #endif | |
633ea5d7 GU |
62 | |
63 | #ifdef __KERNEL__ | |
64 | #define STACK_TOP TASK_SIZE | |
65 | #define STACK_TOP_MAX STACK_TOP | |
66 | #endif | |
67 | ||
68 | /* This decides where the kernel will search for a free chunk of vm | |
69 | * space during mmap's. | |
70 | */ | |
71 | #ifdef CONFIG_MMU | |
2c9b82ad GU |
72 | #if defined(CONFIG_COLDFIRE) |
73 | #define TASK_UNMAPPED_BASE 0x60000000UL | |
74 | #elif defined(CONFIG_SUN3) | |
633ea5d7 | 75 | #define TASK_UNMAPPED_BASE 0x0A000000UL |
2c9b82ad GU |
76 | #else |
77 | #define TASK_UNMAPPED_BASE 0xC0000000UL | |
633ea5d7 GU |
78 | #endif |
79 | #define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr) | |
80 | #else | |
81 | #define TASK_UNMAPPED_BASE 0 | |
82 | #endif | |
83 | ||
84 | struct thread_struct { | |
85 | unsigned long ksp; /* kernel stack pointer */ | |
86 | unsigned long usp; /* user stack pointer */ | |
87 | unsigned short sr; /* saved status register */ | |
88 | unsigned short fs; /* saved fs (sfc, dfc) */ | |
89 | unsigned long crp[2]; /* cpu root pointer */ | |
90 | unsigned long esp0; /* points to SR of stack frame */ | |
91 | unsigned long faddr; /* info about last fault */ | |
92 | int signo, code; | |
93 | unsigned long fp[8*3]; | |
94 | unsigned long fpcntl[3]; /* fp control regs */ | |
95 | unsigned char fpstate[FPSTATESIZE]; /* floating point state */ | |
633ea5d7 GU |
96 | }; |
97 | ||
98 | #define INIT_THREAD { \ | |
99 | .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ | |
100 | .sr = PS_S, \ | |
101 | .fs = __KERNEL_DS, \ | |
633ea5d7 GU |
102 | } |
103 | ||
0973c687 GU |
104 | /* |
105 | * ColdFire stack format sbould be 0x4 for an aligned usp (will always be | |
106 | * true on thread creation). We need to set this explicitly. | |
107 | */ | |
108 | #ifdef CONFIG_COLDFIRE | |
109 | #define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0) | |
110 | #else | |
111 | #define setframeformat(_regs) do { } while (0) | |
112 | #endif | |
113 | ||
633ea5d7 GU |
114 | /* |
115 | * Do necessary setup to start up a newly executed thread. | |
116 | */ | |
117 | static inline void start_thread(struct pt_regs * regs, unsigned long pc, | |
118 | unsigned long usp) | |
119 | { | |
633ea5d7 GU |
120 | regs->pc = pc; |
121 | regs->sr &= ~0x2000; | |
0973c687 | 122 | setframeformat(regs); |
633ea5d7 GU |
123 | wrusp(usp); |
124 | } | |
125 | ||
633ea5d7 GU |
126 | /* Forward declaration, a strange C thing */ |
127 | struct task_struct; | |
128 | ||
129 | /* Free all resources held by a thread. */ | |
130 | static inline void release_thread(struct task_struct *dead_task) | |
131 | { | |
132 | } | |
133 | ||
633ea5d7 GU |
134 | unsigned long get_wchan(struct task_struct *p); |
135 | ||
136 | #define KSTK_EIP(tsk) \ | |
137 | ({ \ | |
138 | unsigned long eip = 0; \ | |
139 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ | |
140 | (virt_addr_valid((tsk)->thread.esp0))) \ | |
141 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ | |
142 | eip; }) | |
143 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
144 | ||
c23b6538 GU |
145 | #define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0)) |
146 | ||
633ea5d7 GU |
147 | #define cpu_relax() barrier() |
148 | ||
49148020 | 149 | #endif |