Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-m68k/processor.h |
| 3 | * |
| 4 | * Copyright (C) 1995 Hamish Macdonald |
| 5 | */ |
| 6 | |
| 7 | #ifndef __ASM_M68K_PROCESSOR_H |
| 8 | #define __ASM_M68K_PROCESSOR_H |
| 9 | |
| 10 | /* |
| 11 | * Default implementation of macro that returns current |
| 12 | * instruction pointer ("program counter"). |
| 13 | */ |
| 14 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/threads.h> |
| 17 | #include <asm/types.h> |
| 18 | #include <asm/segment.h> |
| 19 | #include <asm/fpu.h> |
| 20 | #include <asm/ptrace.h> |
| 21 | #include <asm/current.h> |
| 22 | |
Greg Ungerer | c514b8b | 2005-11-02 14:42:03 +1000 | [diff] [blame] | 23 | static inline unsigned long rdusp(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | { |
| 25 | #ifdef CONFIG_COLDFIRE |
| 26 | extern unsigned int sw_usp; |
| 27 | return(sw_usp); |
| 28 | #else |
| 29 | unsigned long usp; |
| 30 | __asm__ __volatile__("move %/usp,%0" : "=a" (usp)); |
| 31 | return usp; |
| 32 | #endif |
| 33 | } |
| 34 | |
Greg Ungerer | c514b8b | 2005-11-02 14:42:03 +1000 | [diff] [blame] | 35 | static inline void wrusp(unsigned long usp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | #ifdef CONFIG_COLDFIRE |
| 38 | extern unsigned int sw_usp; |
| 39 | sw_usp = usp; |
| 40 | #else |
| 41 | __asm__ __volatile__("move %0,%/usp" : : "a" (usp)); |
| 42 | #endif |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * User space process size: 3.75GB. This is hardcoded into a few places, |
| 47 | * so don't change it unless you know what you are doing. |
| 48 | */ |
| 49 | #define TASK_SIZE (0xF0000000UL) |
| 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 | /* |
| 58 | * if you change this structure, you must change the code and offsets |
| 59 | * in m68k/machasm.S |
| 60 | */ |
| 61 | |
| 62 | struct thread_struct { |
| 63 | unsigned long ksp; /* kernel stack pointer */ |
| 64 | unsigned long usp; /* user stack pointer */ |
| 65 | unsigned short sr; /* saved status register */ |
| 66 | unsigned short fs; /* saved fs (sfc, dfc) */ |
| 67 | unsigned long crp[2]; /* cpu root pointer */ |
| 68 | unsigned long esp0; /* points to SR of stack frame */ |
| 69 | unsigned long fp[8*3]; |
| 70 | unsigned long fpcntl[3]; /* fp control regs */ |
| 71 | unsigned char fpstate[FPSTATESIZE]; /* floating point state */ |
| 72 | }; |
| 73 | |
| 74 | #define INIT_THREAD { \ |
| 75 | sizeof(init_stack) + (unsigned long) init_stack, 0, \ |
| 76 | PS_S, __KERNEL_DS, \ |
| 77 | {0, 0}, 0, {0,}, {0, 0, 0}, {0,}, \ |
| 78 | } |
| 79 | |
| 80 | /* |
Greg Ungerer | 7bf9a37 | 2006-06-26 11:01:32 +1000 | [diff] [blame] | 81 | * Coldfire stacks need to be re-aligned on trap exit, conventional |
| 82 | * 68k can handle this case cleanly. |
| 83 | */ |
| 84 | #if defined(CONFIG_COLDFIRE) |
| 85 | #define reformat(_regs) do { (_regs)->format = 0x4; } while(0) |
| 86 | #else |
| 87 | #define reformat(_regs) do { } while (0) |
| 88 | #endif |
| 89 | |
| 90 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | * Do necessary setup to start up a newly executed thread. |
| 92 | * |
| 93 | * pass the data segment into user programs if it exists, |
| 94 | * it can't hurt anything as far as I can tell |
| 95 | */ |
Greg Ungerer | 7bf9a37 | 2006-06-26 11:01:32 +1000 | [diff] [blame] | 96 | #define start_thread(_regs, _pc, _usp) \ |
| 97 | do { \ |
| 98 | set_fs(USER_DS); /* reads from user space */ \ |
| 99 | (_regs)->pc = (_pc); \ |
| 100 | ((struct switch_stack *)(_regs))[-1].a6 = 0; \ |
| 101 | reformat(_regs); \ |
| 102 | if (current->mm) \ |
| 103 | (_regs)->d5 = current->mm->start_data; \ |
| 104 | (_regs)->sr &= ~0x2000; \ |
| 105 | wrusp(_usp); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } while(0) |
| 107 | |
| 108 | /* Forward declaration, a strange C thing */ |
| 109 | struct task_struct; |
| 110 | |
| 111 | /* Free all resources held by a thread. */ |
| 112 | static inline void release_thread(struct task_struct *dead_task) |
| 113 | { |
| 114 | } |
| 115 | |
| 116 | /* Prepare to copy thread state - unlazy all lazy status */ |
| 117 | #define prepare_to_copy(tsk) do { } while (0) |
| 118 | |
| 119 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); |
| 120 | |
| 121 | /* |
| 122 | * Free current thread data structures etc.. |
| 123 | */ |
| 124 | static inline void exit_thread(void) |
| 125 | { |
| 126 | } |
| 127 | |
| 128 | unsigned long thread_saved_pc(struct task_struct *tsk); |
| 129 | unsigned long get_wchan(struct task_struct *p); |
| 130 | |
| 131 | #define KSTK_EIP(tsk) \ |
| 132 | ({ \ |
| 133 | unsigned long eip = 0; \ |
| 134 | if ((tsk)->thread.esp0 > PAGE_SIZE && \ |
| 135 | (virt_addr_valid((tsk)->thread.esp0))) \ |
| 136 | eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ |
| 137 | eip; }) |
| 138 | #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) |
| 139 | |
| 140 | #define cpu_relax() do { } while (0) |
| 141 | |
| 142 | #endif |