Linux kernel mirror (for testing)
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linux
1/*
2 * include/asm-h8300/processor.h
3 *
4 * Copyright (C) 2002 Yoshinori Sato
5 *
6 * Based on: linux/asm-m68nommu/processor.h
7 *
8 * Copyright (C) 1995 Hamish Macdonald
9 */
10
11#ifndef __ASM_H8300_PROCESSOR_H
12#define __ASM_H8300_PROCESSOR_H
13
14/*
15 * Default implementation of macro that returns current
16 * instruction pointer ("program counter").
17 */
18#define current_text_addr() ({ __label__ _l; _l: &&_l;})
19
20#include <linux/compiler.h>
21#include <asm/segment.h>
22#include <asm/fpu.h>
23#include <asm/ptrace.h>
24#include <asm/current.h>
25
26static inline unsigned long rdusp(void) {
27 extern unsigned int sw_usp;
28 return(sw_usp);
29}
30
31static inline void wrusp(unsigned long usp) {
32 extern unsigned int sw_usp;
33 sw_usp = usp;
34}
35
36/*
37 * User space process size: 3.75GB. This is hardcoded into a few places,
38 * so don't change it unless you know what you are doing.
39 */
40#define TASK_SIZE (0xFFFFFFFFUL)
41
42/*
43 * This decides where the kernel will search for a free chunk of vm
44 * space during mmap's. We won't be using it
45 */
46#define TASK_UNMAPPED_BASE 0
47
48struct thread_struct {
49 unsigned long ksp; /* kernel stack pointer */
50 unsigned long usp; /* user stack pointer */
51 unsigned long ccr; /* saved status register */
52 unsigned long esp0; /* points to SR of stack frame */
53 struct {
54 unsigned short *addr;
55 unsigned short inst;
56 } breakinfo;
57};
58
59#define INIT_THREAD { \
60 .ksp = sizeof(init_stack) + (unsigned long)init_stack, \
61 .usp = 0, \
62 .ccr = PS_S, \
63 .esp0 = 0, \
64 .breakinfo = { \
65 .addr = (unsigned short *)-1, \
66 .inst = 0 \
67 } \
68}
69
70/*
71 * Do necessary setup to start up a newly executed thread.
72 *
73 * pass the data segment into user programs if it exists,
74 * it can't hurt anything as far as I can tell
75 */
76#if defined(__H8300H__)
77#define start_thread(_regs, _pc, _usp) \
78do { \
79 set_fs(USER_DS); /* reads from user space */ \
80 (_regs)->pc = (_pc); \
81 (_regs)->ccr &= 0x00; /* clear kernel flag */ \
82 (_regs)->er5 = current->mm->start_data; /* GOT base */ \
83 wrusp((unsigned long)(_usp) - sizeof(unsigned long)*3); \
84} while(0)
85#endif
86#if defined(__H8300S__)
87#define start_thread(_regs, _pc, _usp) \
88do { \
89 set_fs(USER_DS); /* reads from user space */ \
90 (_regs)->pc = (_pc); \
91 (_regs)->ccr = 0x00; /* clear kernel flag */ \
92 (_regs)->exr = 0x78; /* enable all interrupts */ \
93 (_regs)->er5 = current->mm->start_data; /* GOT base */ \
94 /* 14 = space for retaddr(4), vector(4), er0(4) and ext(2) on stack */ \
95 wrusp(((unsigned long)(_usp)) - 14); \
96} while(0)
97#endif
98
99/* Forward declaration, a strange C thing */
100struct task_struct;
101
102/* Free all resources held by a thread. */
103static inline void release_thread(struct task_struct *dead_task)
104{
105}
106
107extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
108
109#define prepare_to_copy(tsk) do { } while (0)
110
111/*
112 * Free current thread data structures etc..
113 */
114static inline void exit_thread(void)
115{
116}
117
118/*
119 * Return saved PC of a blocked thread.
120 */
121unsigned long thread_saved_pc(struct task_struct *tsk);
122unsigned long get_wchan(struct task_struct *p);
123
124#define KSTK_EIP(tsk) \
125 ({ \
126 unsigned long eip = 0; \
127 if ((tsk)->thread.esp0 > PAGE_SIZE && \
128 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
129 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
130 eip; })
131#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
132
133#define cpu_relax() barrier()
134
135#endif