1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * include/asm-m68k/processor.h 4 * 5 * Copyright (C) 1995 Hamish Macdonald 6 */ 7 8#ifndef __ASM_M68K_PROCESSOR_H 9#define __ASM_M68K_PROCESSOR_H 10 11#include <linux/preempt.h> 12#include <linux/thread_info.h> 13#include <asm/fpu.h> 14#include <asm/ptrace.h> 15 16static inline unsigned long rdusp(void) 17{ 18#ifdef CONFIG_COLDFIRE_SW_A7 19 extern unsigned int sw_usp; 20 return sw_usp; 21#else 22 register unsigned long usp __asm__("a0"); 23 /* move %usp,%a0 */ 24 __asm__ __volatile__(".word 0x4e68" : "=a" (usp)); 25 return usp; 26#endif 27} 28 29static inline void wrusp(unsigned long usp) 30{ 31#ifdef CONFIG_COLDFIRE_SW_A7 32 extern unsigned int sw_usp; 33 sw_usp = usp; 34#else 35 register unsigned long a0 __asm__("a0") = usp; 36 /* move %a0,%usp */ 37 __asm__ __volatile__(".word 0x4e60" : : "a" (a0) ); 38#endif 39} 40 41/* 42 * User space process size: 3.75GB. This is hardcoded into a few places, 43 * so don't change it unless you know what you are doing. 44 */ 45#ifdef CONFIG_MMU 46#if defined(CONFIG_COLDFIRE) 47#define TASK_SIZE (0xC0000000UL) 48#elif defined(CONFIG_SUN3) 49#define TASK_SIZE (0x0E000000UL) 50#else 51#define TASK_SIZE (0xF0000000UL) 52#endif 53#else 54#define TASK_SIZE (0xFFFFFFFFUL) 55#endif 56 57#ifdef __KERNEL__ 58#define STACK_TOP TASK_SIZE 59#define STACK_TOP_MAX STACK_TOP 60#endif 61 62/* This decides where the kernel will search for a free chunk of vm 63 * space during mmap's. 64 */ 65#ifdef CONFIG_MMU 66#if defined(CONFIG_COLDFIRE) 67#define TASK_UNMAPPED_BASE 0x60000000UL 68#elif defined(CONFIG_SUN3) 69#define TASK_UNMAPPED_BASE 0x0A000000UL 70#else 71#define TASK_UNMAPPED_BASE 0xC0000000UL 72#endif 73#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr) 74#else 75#define TASK_UNMAPPED_BASE 0 76#endif 77 78/* Address spaces (or Function Codes in Motorola lingo) */ 79#define USER_DATA 1 80#define USER_PROGRAM 2 81#define SUPER_DATA 5 82#define SUPER_PROGRAM 6 83#define CPU_SPACE 7 84 85#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES 86/* 87 * Set the SFC/DFC registers for special MM operations. For most normal 88 * operation these remain set to USER_DATA for the uaccess routines. 89 */ 90static inline void set_fc(unsigned long val) 91{ 92 WARN_ON_ONCE(in_interrupt()); 93 94 __asm__ __volatile__ ("movec %0,%/sfc\n\t" 95 "movec %0,%/dfc\n\t" 96 : /* no outputs */ : "r" (val) : "memory"); 97} 98#else 99static inline void set_fc(unsigned long val) 100{ 101} 102#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */ 103 104struct thread_struct { 105 unsigned long ksp; /* kernel stack pointer */ 106 unsigned long usp; /* user stack pointer */ 107 unsigned short sr; /* saved status register */ 108 unsigned short fc; /* saved fc (sfc, dfc) */ 109 unsigned long crp[2]; /* cpu root pointer */ 110 unsigned long esp0; /* points to SR of stack frame */ 111 unsigned long faddr; /* info about last fault */ 112 int signo, code; 113 unsigned long fp[8*3]; 114 unsigned long fpcntl[3]; /* fp control regs */ 115 unsigned char fpstate[FPSTATESIZE]; /* floating point state */ 116}; 117 118#define INIT_THREAD { \ 119 .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ 120 .sr = PS_S, \ 121 .fc = USER_DATA, \ 122} 123 124/* 125 * ColdFire stack format sbould be 0x4 for an aligned usp (will always be 126 * true on thread creation). We need to set this explicitly. 127 */ 128#ifdef CONFIG_COLDFIRE 129#define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0) 130#else 131#define setframeformat(_regs) do { } while (0) 132#endif 133 134/* 135 * Do necessary setup to start up a newly executed thread. 136 */ 137static inline void start_thread(struct pt_regs * regs, unsigned long pc, 138 unsigned long usp) 139{ 140 regs->pc = pc; 141 regs->sr &= ~0x2000; 142 setframeformat(regs); 143 wrusp(usp); 144} 145 146/* Forward declaration, a strange C thing */ 147struct task_struct; 148 149unsigned long __get_wchan(struct task_struct *p); 150void show_registers(struct pt_regs *regs); 151 152#define KSTK_EIP(tsk) \ 153 ({ \ 154 unsigned long eip = 0; \ 155 if ((tsk)->thread.esp0 > PAGE_SIZE && \ 156 (virt_addr_valid((tsk)->thread.esp0))) \ 157 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ 158 eip; }) 159#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) 160 161#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0)) 162 163#define cpu_relax() barrier() 164 165#endif 166