Linux kernel mirror (for testing)
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1/*
2 * include/asm-m68k/processor.h
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 */
6
7#ifndef __ASM_M68K_PROCESSOR_H
8#define __ASM_M68K_PROCESSOR_H
9
10/*
11 * Default implementation of macro that returns current
12 * instruction pointer ("program counter").
13 */
14#define current_text_addr() ({ __label__ _l; _l: &&_l;})
15
16#include <linux/config.h>
17#include <asm/segment.h>
18#include <asm/fpu.h>
19#include <asm/ptrace.h>
20
21static inline unsigned long rdusp(void)
22{
23 unsigned long usp;
24
25 __asm__ __volatile__("move %/usp,%0" : "=a" (usp));
26 return usp;
27}
28
29static inline void wrusp(unsigned long usp)
30{
31 __asm__ __volatile__("move %0,%/usp" : : "a" (usp));
32}
33
34/*
35 * User space process size: 3.75GB. This is hardcoded into a few places,
36 * so don't change it unless you know what you are doing.
37 */
38#ifndef CONFIG_SUN3
39#define TASK_SIZE (0xF0000000UL)
40#else
41#ifdef __ASSEMBLY__
42#define TASK_SIZE (0x0E000000)
43#else
44#define TASK_SIZE (0x0E000000UL)
45#endif
46#endif
47
48/* This decides where the kernel will search for a free chunk of vm
49 * space during mmap's.
50 */
51#ifndef CONFIG_SUN3
52#define TASK_UNMAPPED_BASE 0xC0000000UL
53#else
54#define TASK_UNMAPPED_BASE 0x0A000000UL
55#endif
56#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
57
58struct task_work {
59 unsigned char sigpending;
60 unsigned char notify_resume; /* request for notification on
61 userspace execution resumption */
62 char need_resched;
63 unsigned char delayed_trace; /* single step a syscall */
64 unsigned char syscall_trace; /* count of syscall interceptors */
65 unsigned char memdie; /* task was selected to be killed */
66 unsigned char pad[2];
67};
68
69struct thread_struct {
70 unsigned long ksp; /* kernel stack pointer */
71 unsigned long usp; /* user stack pointer */
72 unsigned short sr; /* saved status register */
73 unsigned short fs; /* saved fs (sfc, dfc) */
74 unsigned long crp[2]; /* cpu root pointer */
75 unsigned long esp0; /* points to SR of stack frame */
76 unsigned long faddr; /* info about last fault */
77 int signo, code;
78 unsigned long fp[8*3];
79 unsigned long fpcntl[3]; /* fp control regs */
80 unsigned char fpstate[FPSTATESIZE]; /* floating point state */
81 struct task_work work;
82};
83
84#define INIT_THREAD { \
85 ksp: sizeof(init_stack) + (unsigned long) init_stack, \
86 sr: PS_S, \
87 fs: __KERNEL_DS, \
88 info: INIT_THREAD_INFO(init_task) \
89}
90
91/*
92 * Do necessary setup to start up a newly executed thread.
93 */
94static inline void start_thread(struct pt_regs * regs, unsigned long pc,
95 unsigned long usp)
96{
97 /* reads from user space */
98 set_fs(USER_DS);
99
100 regs->pc = pc;
101 regs->sr &= ~0x2000;
102 wrusp(usp);
103}
104
105/* Forward declaration, a strange C thing */
106struct task_struct;
107
108/* Free all resources held by a thread. */
109static inline void release_thread(struct task_struct *dead_task)
110{
111}
112
113/* Prepare to copy thread state - unlazy all lazy status */
114#define prepare_to_copy(tsk) do { } while (0)
115
116extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
117
118/*
119 * Free current thread data structures etc..
120 */
121static inline void exit_thread(void)
122{
123}
124
125extern unsigned long thread_saved_pc(struct task_struct *tsk);
126
127unsigned long get_wchan(struct task_struct *p);
128
129#define KSTK_EIP(tsk) \
130 ({ \
131 unsigned long eip = 0; \
132 if ((tsk)->thread.esp0 > PAGE_SIZE && \
133 (virt_addr_valid((tsk)->thread.esp0))) \
134 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
135 eip; })
136#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
137
138#define cpu_relax() barrier()
139
140#endif