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