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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d2a5f499 YS |
2 | /* |
3 | * include/asm-h8300/processor.h | |
4 | * | |
5 | * Copyright (C) 2002 Yoshinori Sato | |
6 | * | |
7 | * Based on: linux/asm-m68nommu/processor.h | |
8 | * | |
9 | * Copyright (C) 1995 Hamish Macdonald | |
10 | */ | |
11 | ||
12 | #ifndef __ASM_H8300_PROCESSOR_H | |
13 | #define __ASM_H8300_PROCESSOR_H | |
14 | ||
15 | /* | |
16 | * Default implementation of macro that returns current | |
17 | * instruction pointer ("program counter"). | |
18 | */ | |
19 | #define current_text_addr() ({ __label__ _l; _l: &&_l; }) | |
20 | ||
21 | #include <linux/compiler.h> | |
22 | #include <asm/segment.h> | |
23 | #include <asm/ptrace.h> | |
24 | #include <asm/current.h> | |
25 | ||
26 | static inline unsigned long rdusp(void) | |
27 | { | |
28 | extern unsigned int _sw_usp; | |
29 | ||
30 | return _sw_usp; | |
31 | } | |
32 | ||
33 | static inline void wrusp(unsigned long usp) | |
34 | { | |
35 | extern unsigned int _sw_usp; | |
36 | ||
37 | _sw_usp = usp; | |
38 | } | |
39 | ||
40 | /* | |
41 | * User space process size: 3.75GB. This is hardcoded into a few places, | |
42 | * so don't change it unless you know what you are doing. | |
43 | */ | |
44 | #define TASK_SIZE (0xFFFFFFFFUL) | |
45 | ||
46 | #ifdef __KERNEL__ | |
47 | #define STACK_TOP TASK_SIZE | |
48 | #define STACK_TOP_MAX STACK_TOP | |
49 | #endif | |
50 | ||
51 | /* | |
52 | * This decides where the kernel will search for a free chunk of vm | |
53 | * space during mmap's. We won't be using it | |
54 | */ | |
55 | #define TASK_UNMAPPED_BASE 0 | |
56 | ||
57 | struct thread_struct { | |
58 | unsigned long ksp; /* kernel stack pointer */ | |
59 | unsigned long usp; /* user stack pointer */ | |
60 | unsigned long ccr; /* saved status register */ | |
61 | unsigned long esp0; /* points to SR of stack frame */ | |
62 | struct { | |
63 | unsigned short *addr; | |
64 | unsigned short inst; | |
65 | } breakinfo; | |
66 | }; | |
67 | ||
68 | #define INIT_THREAD { \ | |
69 | .ksp = sizeof(init_stack) + (unsigned long)init_stack, \ | |
70 | .usp = 0, \ | |
71 | .ccr = PS_S, \ | |
72 | .esp0 = 0, \ | |
73 | .breakinfo = { \ | |
74 | .addr = (unsigned short *)-1, \ | |
75 | .inst = 0 \ | |
76 | } \ | |
77 | } | |
78 | ||
79 | /* | |
80 | * Do necessary setup to start up a newly executed thread. | |
81 | * | |
82 | * pass the data segment into user programs if it exists, | |
83 | * it can't hurt anything as far as I can tell | |
84 | */ | |
85 | #if defined(CONFIG_CPU_H8300H) | |
86 | #define start_thread(_regs, _pc, _usp) \ | |
87 | do { \ | |
88 | (_regs)->pc = (_pc); \ | |
89 | (_regs)->ccr = 0x00; /* clear all flags */ \ | |
90 | (_regs)->er5 = current->mm->start_data; /* GOT base */ \ | |
91 | (_regs)->sp = ((unsigned long)(_usp)) - sizeof(unsigned long) * 3; \ | |
92 | } while (0) | |
93 | #endif | |
94 | #if defined(CONFIG_CPU_H8S) | |
95 | #define start_thread(_regs, _pc, _usp) \ | |
96 | do { \ | |
97 | (_regs)->pc = (_pc); \ | |
98 | (_regs)->ccr = 0x00; /* clear kernel flag */ \ | |
99 | (_regs)->exr = 0x78; /* enable all interrupts */ \ | |
100 | (_regs)->er5 = current->mm->start_data; /* GOT base */ \ | |
101 | /* 14 = space for retaddr(4), vector(4), er0(4) and exr(2) on stack */ \ | |
102 | (_regs)->sp = ((unsigned long)(_usp)) - 14; \ | |
103 | } while (0) | |
104 | #endif | |
105 | ||
106 | /* Forward declaration, a strange C thing */ | |
107 | struct task_struct; | |
108 | ||
109 | /* Free all resources held by a thread. */ | |
110 | static inline void release_thread(struct task_struct *dead_task) | |
111 | { | |
112 | } | |
113 | ||
d2a5f499 YS |
114 | unsigned long get_wchan(struct task_struct *p); |
115 | ||
116 | #define KSTK_EIP(tsk) \ | |
117 | ({ \ | |
118 | unsigned long eip = 0; \ | |
119 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ | |
120 | MAP_NR((tsk)->thread.esp0) < max_mapnr) \ | |
121 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ | |
122 | eip; }) | |
123 | ||
124 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) | |
125 | ||
126 | #define cpu_relax() barrier() | |
d2a5f499 YS |
127 | |
128 | #define HARD_RESET_NOW() ({ \ | |
129 | local_irq_disable(); \ | |
130 | asm("jmp @@0"); \ | |
131 | }) | |
132 | ||
133 | #endif |