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   1 /*
   2  *  linux/include/asm-arm26/processor.h
   3  *
   4  *  Copyright (C) 1995 Russell King
   5  *  Copyright (C) 2003 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __ASM_ARM_PROCESSOR_H
  13 #define __ASM_ARM_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 #ifdef __KERNEL__
  22
  23 #include <asm/atomic.h>
  24 #include <asm/ptrace.h>
  25 #include <linux/string.h>
  26
  27 #define KERNEL_STACK_SIZE 4096
  28
  29 typedef struct {
  30         void (*put_byte)(void);               /* Special calling convention */
  31         void (*get_byte)(void);               /* Special calling convention */
  32         void (*put_half)(void);               /* Special calling convention */
  33         void (*get_half)(void);               /* Special calling convention */
  34         void (*put_word)(void);               /* Special calling convention */
  35         void (*get_word)(void);               /* Special calling convention */
  36         void (*put_dword)(void);              /* Special calling convention */
  37         unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz);
  38         unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz);
  39         unsigned long (*clear_user)(void *addr, unsigned long sz);
  40         unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz);
  41         unsigned long (*strnlen_user)(const char *s, long n);
  42 } uaccess_t;
  43
  44 extern uaccess_t uaccess_user, uaccess_kernel;
  45
  46 #define EXTRA_THREAD_STRUCT                     \
  47         uaccess_t       *uaccess;         /* User access functions*/
  48
  49 #define EXTRA_THREAD_STRUCT_INIT                \
  50         .uaccess        = &uaccess_kernel,
  51
  52 // FIXME?!!
  53
  54 #define start_thread(regs,pc,sp)                                        \
  55 ({                                                                      \
  56         unsigned long *stack = (unsigned long *)sp;                     \
  57         set_fs(USER_DS);                                                \
  58         memzero(regs->uregs, sizeof (regs->uregs));                     \
  59         regs->ARM_pc = pc | ~0xfc000003;        /* pc */                \
  60         regs->ARM_sp = sp;              /* sp */                        \
  61         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  62         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  63         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  64 })
  65
  66 #define KSTK_EIP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1020])
  67 #define KSTK_ESP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1018])
  68
  69 struct debug_entry {
  70         u32                     address;
  71         u32                     insn;
  72 };
  73
  74 struct debug_info {
  75         int                     nsaved;
  76         struct debug_entry      bp[2];
  77 };
  78
  79 struct thread_struct {
  80                                                         /* fault info     */
  81         unsigned long                   address;
  82         unsigned long                   trap_no;
  83         unsigned long                   error_code;
  84                                                         /* debugging      */
  85         struct debug_info               debug;
  86         EXTRA_THREAD_STRUCT
  87 };
  88
  89 #define INIT_THREAD  { \
  90 EXTRA_THREAD_STRUCT_INIT \
  91 }
  92
  93 /* Forward declaration, a strange C thing */
  94 struct task_struct;
  95
  96 /* Free all resources held by a thread. */
  97 extern void release_thread(struct task_struct *);
  98
  99 unsigned long get_wchan(struct task_struct *p);
 100
 101 #define cpu_relax()                     barrier()
 102
 103 /* Prepare to copy thread state - unlazy all lazy status */
 104 #define prepare_to_copy(tsk)    do { } while (0)
 105
 106 /*
 107  * Create a new kernel thread
 108  */
 109 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 110
 111 #endif
 112
 113 #endif /* __ASM_ARM_PROCESSOR_H */