182 lines
4.4 KiB
C
182 lines
4.4 KiB
C
/*
|
|
* include/asm-m68k/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/thread_info.h>
|
|
#include <asm/segment.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
|
|
|
|
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 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, \
|
|
.fs = __KERNEL_DS, \
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
#ifdef CONFIG_MMU
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
extern int handle_kernel_fault(struct pt_regs *regs);
|
|
|
|
#else
|
|
|
|
#define start_thread(_regs, _pc, _usp) \
|
|
do { \
|
|
(_regs)->pc = (_pc); \
|
|
setframeformat(_regs); \
|
|
if (current->mm) \
|
|
(_regs)->d5 = current->mm->start_data; \
|
|
(_regs)->sr &= ~0x2000; \
|
|
wrusp(_usp); \
|
|
} while(0)
|
|
|
|
static inline int handle_kernel_fault(struct pt_regs *regs)
|
|
{
|
|
/* Any fault in kernel is fatal on non-mmu */
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* 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)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
static inline void exit_thread(void)
|
|
{
|
|
}
|
|
|
|
extern 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 task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0))
|
|
|
|
#define cpu_relax() barrier()
|
|
#define cpu_relax_lowlatency() cpu_relax()
|
|
|
|
#endif
|