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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180/* 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");}
static inline unsigned long get_fc(void){ unsigned long val;
__asm__ ("movec %/dfc,%0" : "=r" (val) : );
return val;}#elsestatic inline void set_fc(unsigned long val){}
static inline unsigned long get_fc(void){ return USER_DATA;}#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