arch/h8300/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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
 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()
 127
 128 #define HARD_RESET_NOW() ({             \
 129         local_irq_disable();            \
 130         asm("jmp @@0");                 \
 131 })
 132
 133 #endif