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/* * arch/arm/include/asm/processor.h * * Copyright (C) 1995-1999 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __ASM_ARM_PROCESSOR_H #define __ASM_ARM_PROCESSOR_H /* * Default implementation of macro that returns current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) #ifdef __KERNEL__ #include <asm/ptrace.h> #include <asm/types.h> #ifdef __KERNEL__ #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ TASK_SIZE : TASK_SIZE_26) #define STACK_TOP_MAX TASK_SIZE #endif union debug_insn { u32 arm; u16 thumb; }; struct debug_entry { u32 address; union debug_insn insn; }; struct debug_info { int nsaved; struct debug_entry bp[2]; }; struct thread_struct { /* fault info */ unsigned long address; unsigned long trap_no; unsigned long error_code; /* debugging */ struct debug_info debug; }; #define INIT_THREAD { } #ifdef CONFIG_MMU #define nommu_start_thread(regs) do { } while (0) #else #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data #endif #define start_thread(regs,pc,sp) \ ({ \ unsigned long *stack = (unsigned long *)sp; \ set_fs(USER_DS); \ memset(regs->uregs, 0, sizeof(regs->uregs)); \ if (current->personality & ADDR_LIMIT_32BIT) \ regs->ARM_cpsr = USR_MODE; \ else \ regs->ARM_cpsr = USR26_MODE; \ if (elf_hwcap & HWCAP_THUMB && pc & 1) \ regs->ARM_cpsr |= PSR_T_BIT; \ regs->ARM_cpsr |= PSR_ENDSTATE; \ regs->ARM_pc = pc & ~1; /* pc */ \ regs->ARM_sp = sp; /* sp */ \ regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ nommu_start_thread(regs); \ }) /* Forward declaration, a strange C thing */ struct task_struct; /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) unsigned long get_wchan(struct task_struct *p); #define cpu_relax() barrier() /* * Create a new kernel thread */ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); #define task_pt_regs(p) \ ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp /* * Prefetching support - only ARMv5. */ #if __LINUX_ARM_ARCH__ >= 5 #define ARCH_HAS_PREFETCH static inline void prefetch(const void *ptr) { __asm__ __volatile__( "pld\t%a0" : : "p" (ptr) : "cc"); } #define ARCH_HAS_PREFETCHW #define prefetchw(ptr) prefetch(ptr) #define ARCH_HAS_SPINLOCK_PREFETCH #define spin_lock_prefetch(x) do { } while (0) #endif #endif #endif /* __ASM_ARM_PROCESSOR_H */


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