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Linux/arch/m68k/include/asm/processor.h

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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/thread_info.h>
 17 #include <asm/segment.h>
 18 #include <asm/fpu.h>
 19 #include <asm/ptrace.h>
 20 
 21 static inline unsigned long rdusp(void)
 22 {
 23 #ifdef CONFIG_COLDFIRE_SW_A7
 24         extern unsigned int sw_usp;
 25         return sw_usp;
 26 #else
 27         register unsigned long usp __asm__("a0");
 28         /* move %usp,%a0 */
 29         __asm__ __volatile__(".word 0x4e68" : "=a" (usp));
 30         return usp;
 31 #endif
 32 }
 33 
 34 static inline void wrusp(unsigned long usp)
 35 {
 36 #ifdef CONFIG_COLDFIRE_SW_A7
 37         extern unsigned int sw_usp;
 38         sw_usp = usp;
 39 #else
 40         register unsigned long a0 __asm__("a0") = usp;
 41         /* move %a0,%usp */
 42         __asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
 43 #endif
 44 }
 45 
 46 /*
 47  * User space process size: 3.75GB. This is hardcoded into a few places,
 48  * so don't change it unless you know what you are doing.
 49  */
 50 #ifdef CONFIG_MMU
 51 #if defined(CONFIG_COLDFIRE)
 52 #define TASK_SIZE       (0xC0000000UL)
 53 #elif defined(CONFIG_SUN3)
 54 #define TASK_SIZE       (0x0E000000UL)
 55 #else
 56 #define TASK_SIZE       (0xF0000000UL)
 57 #endif
 58 #else
 59 #define TASK_SIZE       (0xFFFFFFFFUL)
 60 #endif
 61 
 62 #ifdef __KERNEL__
 63 #define STACK_TOP       TASK_SIZE
 64 #define STACK_TOP_MAX   STACK_TOP
 65 #endif
 66 
 67 /* This decides where the kernel will search for a free chunk of vm
 68  * space during mmap's.
 69  */
 70 #ifdef CONFIG_MMU
 71 #if defined(CONFIG_COLDFIRE)
 72 #define TASK_UNMAPPED_BASE      0x60000000UL
 73 #elif defined(CONFIG_SUN3)
 74 #define TASK_UNMAPPED_BASE      0x0A000000UL
 75 #else
 76 #define TASK_UNMAPPED_BASE      0xC0000000UL
 77 #endif
 78 #define TASK_UNMAPPED_ALIGN(addr, off)  PAGE_ALIGN(addr)
 79 #else
 80 #define TASK_UNMAPPED_BASE      0
 81 #endif
 82 
 83 struct thread_struct {
 84         unsigned long  ksp;             /* kernel stack pointer */
 85         unsigned long  usp;             /* user stack pointer */
 86         unsigned short sr;              /* saved status register */
 87         unsigned short fs;              /* saved fs (sfc, dfc) */
 88         unsigned long  crp[2];          /* cpu root pointer */
 89         unsigned long  esp0;            /* points to SR of stack frame */
 90         unsigned long  faddr;           /* info about last fault */
 91         int            signo, code;
 92         unsigned long  fp[8*3];
 93         unsigned long  fpcntl[3];       /* fp control regs */
 94         unsigned char  fpstate[FPSTATESIZE];  /* floating point state */
 95 };
 96 
 97 #define INIT_THREAD  {                                                  \
 98         .ksp    = sizeof(init_stack) + (unsigned long) init_stack,      \
 99         .sr     = PS_S,                                                 \
100         .fs     = __KERNEL_DS,                                          \
101 }
102 
103 /*
104  * ColdFire stack format sbould be 0x4 for an aligned usp (will always be
105  * true on thread creation). We need to set this explicitly.
106  */
107 #ifdef CONFIG_COLDFIRE
108 #define setframeformat(_regs)   do { (_regs)->format = 0x4; } while(0)
109 #else
110 #define setframeformat(_regs)   do { } while (0)
111 #endif
112 
113 #ifdef CONFIG_MMU
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 {
120         regs->pc = pc;
121         regs->sr &= ~0x2000;
122         setframeformat(regs);
123         wrusp(usp);
124 }
125 
126 extern int handle_kernel_fault(struct pt_regs *regs);
127 
128 #else
129 
130 #define start_thread(_regs, _pc, _usp)                  \
131 do {                                                    \
132         (_regs)->pc = (_pc);                            \
133         setframeformat(_regs);                          \
134         if (current->mm)                                \
135                 (_regs)->d5 = current->mm->start_data;  \
136         (_regs)->sr &= ~0x2000;                         \
137         wrusp(_usp);                                    \
138 } while(0)
139 
140 static inline  int handle_kernel_fault(struct pt_regs *regs)
141 {
142         /* Any fault in kernel is fatal on non-mmu */
143         return 0;
144 }
145 
146 #endif
147 
148 /* Forward declaration, a strange C thing */
149 struct task_struct;
150 
151 /* Free all resources held by a thread. */
152 static inline void release_thread(struct task_struct *dead_task)
153 {
154 }
155 
156 /*
157  * Free current thread data structures etc..
158  */
159 static inline void exit_thread(void)
160 {
161 }
162 
163 extern unsigned long thread_saved_pc(struct task_struct *tsk);
164 
165 unsigned long get_wchan(struct task_struct *p);
166 
167 #define KSTK_EIP(tsk)   \
168     ({                  \
169         unsigned long eip = 0;   \
170         if ((tsk)->thread.esp0 > PAGE_SIZE && \
171             (virt_addr_valid((tsk)->thread.esp0))) \
172               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
173         eip; })
174 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
175 
176 #define task_pt_regs(tsk)       ((struct pt_regs *) ((tsk)->thread.esp0))
177 
178 #define cpu_relax()     barrier()
179 
180 #endif
181 

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