| /* |
| * include/asm-m68knommu/processor.h |
| * |
| * Copyright (C) 1995 Hamish Macdonald |
| */ |
| |
| #ifndef __ASM_M68K_PROCESSOR_H |
| #define __ASM_M68K_PROCESSOR_H |
| |
| /* |
| * Default implementation of macro that returns current |
| * instruction pointer ("program counter"). |
| */ |
| #define current_text_addr() ({ __label__ _l; _l: &&_l;}) |
| |
| #include <linux/compiler.h> |
| #include <linux/threads.h> |
| #include <asm/types.h> |
| #include <asm/segment.h> |
| #include <asm/fpu.h> |
| #include <asm/ptrace.h> |
| #include <asm/current.h> |
| |
| static inline unsigned long rdusp(void) |
| { |
| #ifdef CONFIG_COLDFIRE |
| extern unsigned int sw_usp; |
| return(sw_usp); |
| #else |
| unsigned long usp; |
| __asm__ __volatile__("move %/usp,%0" : "=a" (usp)); |
| return usp; |
| #endif |
| } |
| |
| static inline void wrusp(unsigned long usp) |
| { |
| #ifdef CONFIG_COLDFIRE |
| extern unsigned int sw_usp; |
| sw_usp = usp; |
| #else |
| __asm__ __volatile__("move %0,%/usp" : : "a" (usp)); |
| #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. |
| */ |
| #define TASK_SIZE (0xF0000000UL) |
| |
| /* |
| * This decides where the kernel will search for a free chunk of vm |
| * space during mmap's. We won't be using it |
| */ |
| #define TASK_UNMAPPED_BASE 0 |
| |
| /* |
| * if you change this structure, you must change the code and offsets |
| * in m68k/machasm.S |
| */ |
| |
| struct thread_struct { |
| unsigned long ksp; /* kernel stack pointer */ |
| unsigned long usp; /* user stack pointer */ |
| unsigned short sr; /* saved status register */ |
| unsigned short fs; /* saved fs (sfc, dfc) */ |
| unsigned long crp[2]; /* cpu root pointer */ |
| unsigned long esp0; /* points to SR of stack frame */ |
| 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, \ |
| .fs = __KERNEL_DS, \ |
| } |
| |
| /* |
| * Coldfire stacks need to be re-aligned on trap exit, conventional |
| * 68k can handle this case cleanly. |
| */ |
| #if defined(CONFIG_COLDFIRE) |
| #define reformat(_regs) do { (_regs)->format = 0x4; } while(0) |
| #else |
| #define reformat(_regs) do { } while (0) |
| #endif |
| |
| /* |
| * Do necessary setup to start up a newly executed thread. |
| * |
| * pass the data segment into user programs if it exists, |
| * it can't hurt anything as far as I can tell |
| */ |
| #define start_thread(_regs, _pc, _usp) \ |
| do { \ |
| set_fs(USER_DS); /* reads from user space */ \ |
| (_regs)->pc = (_pc); \ |
| ((struct switch_stack *)(_regs))[-1].a6 = 0; \ |
| reformat(_regs); \ |
| if (current->mm) \ |
| (_regs)->d5 = current->mm->start_data; \ |
| (_regs)->sr &= ~0x2000; \ |
| wrusp(_usp); \ |
| } while(0) |
| |
| /* Forward declaration, a strange C thing */ |
| struct task_struct; |
| |
| /* Free all resources held by a thread. */ |
| static inline void release_thread(struct task_struct *dead_task) |
| { |
| } |
| |
| /* Prepare to copy thread state - unlazy all lazy status */ |
| #define prepare_to_copy(tsk) do { } while (0) |
| |
| extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| |
| /* |
| * Free current thread data structures etc.. |
| */ |
| static inline void exit_thread(void) |
| { |
| } |
| |
| unsigned long thread_saved_pc(struct task_struct *tsk); |
| unsigned long get_wchan(struct task_struct *p); |
| |
| #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 cpu_relax() barrier() |
| |
| #endif |