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143 lines
3.4 KiB
143 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/asm-m68k/processor.h |
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* |
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* Copyright (C) 1995 Hamish Macdonald |
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*/ |
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#ifndef __ASM_M68K_PROCESSOR_H |
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#define __ASM_M68K_PROCESSOR_H |
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#include <linux/thread_info.h> |
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#include <asm/segment.h> |
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#include <asm/fpu.h> |
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#include <asm/ptrace.h> |
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static inline unsigned long rdusp(void) |
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{ |
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#ifdef CONFIG_COLDFIRE_SW_A7 |
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extern unsigned int sw_usp; |
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return sw_usp; |
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#else |
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register unsigned long usp __asm__("a0"); |
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/* move %usp,%a0 */ |
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__asm__ __volatile__(".word 0x4e68" : "=a" (usp)); |
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return usp; |
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#endif |
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} |
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static inline void wrusp(unsigned long usp) |
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{ |
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#ifdef CONFIG_COLDFIRE_SW_A7 |
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extern unsigned int sw_usp; |
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sw_usp = usp; |
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#else |
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register unsigned long a0 __asm__("a0") = usp; |
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/* move %a0,%usp */ |
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__asm__ __volatile__(".word 0x4e60" : : "a" (a0) ); |
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#endif |
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} |
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/* |
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* User space process size: 3.75GB. This is hardcoded into a few places, |
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* so don't change it unless you know what you are doing. |
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*/ |
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#ifdef CONFIG_MMU |
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#if defined(CONFIG_COLDFIRE) |
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#define TASK_SIZE (0xC0000000UL) |
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#elif defined(CONFIG_SUN3) |
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#define TASK_SIZE (0x0E000000UL) |
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#else |
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#define TASK_SIZE (0xF0000000UL) |
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#endif |
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#else |
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#define TASK_SIZE (0xFFFFFFFFUL) |
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#endif |
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#ifdef __KERNEL__ |
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#define STACK_TOP TASK_SIZE |
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#define STACK_TOP_MAX STACK_TOP |
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#endif |
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/* This decides where the kernel will search for a free chunk of vm |
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* space during mmap's. |
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*/ |
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#ifdef CONFIG_MMU |
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#if defined(CONFIG_COLDFIRE) |
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#define TASK_UNMAPPED_BASE 0x60000000UL |
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#elif defined(CONFIG_SUN3) |
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#define TASK_UNMAPPED_BASE 0x0A000000UL |
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#else |
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#define TASK_UNMAPPED_BASE 0xC0000000UL |
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#endif |
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#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr) |
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#else |
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#define TASK_UNMAPPED_BASE 0 |
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#endif |
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struct thread_struct { |
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unsigned long ksp; /* kernel stack pointer */ |
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unsigned long usp; /* user stack pointer */ |
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unsigned short sr; /* saved status register */ |
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unsigned short fs; /* saved fs (sfc, dfc) */ |
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unsigned long crp[2]; /* cpu root pointer */ |
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unsigned long esp0; /* points to SR of stack frame */ |
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unsigned long faddr; /* info about last fault */ |
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int signo, code; |
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unsigned long fp[8*3]; |
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unsigned long fpcntl[3]; /* fp control regs */ |
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unsigned char fpstate[FPSTATESIZE]; /* floating point state */ |
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}; |
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#define INIT_THREAD { \ |
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.ksp = sizeof(init_stack) + (unsigned long) init_stack, \ |
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.sr = PS_S, \ |
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.fs = __KERNEL_DS, \ |
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} |
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/* |
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* ColdFire stack format sbould be 0x4 for an aligned usp (will always be |
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* true on thread creation). We need to set this explicitly. |
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*/ |
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#ifdef CONFIG_COLDFIRE |
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#define setframeformat(_regs) do { (_regs)->format = 0x4; } while(0) |
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#else |
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#define setframeformat(_regs) do { } while (0) |
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#endif |
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/* |
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* Do necessary setup to start up a newly executed thread. |
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*/ |
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static inline void start_thread(struct pt_regs * regs, unsigned long pc, |
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unsigned long usp) |
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{ |
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regs->pc = pc; |
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regs->sr &= ~0x2000; |
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setframeformat(regs); |
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wrusp(usp); |
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} |
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/* Forward declaration, a strange C thing */ |
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struct task_struct; |
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/* Free all resources held by a thread. */ |
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static inline void release_thread(struct task_struct *dead_task) |
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{ |
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} |
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unsigned long get_wchan(struct task_struct *p); |
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#define KSTK_EIP(tsk) \ |
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({ \ |
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unsigned long eip = 0; \ |
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if ((tsk)->thread.esp0 > PAGE_SIZE && \ |
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(virt_addr_valid((tsk)->thread.esp0))) \ |
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \ |
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eip; }) |
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp) |
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#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0)) |
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#define cpu_relax() barrier() |
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#endif
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