4f7a18124c
Various places in the ARM kernel implicitly assumed that kernel stacks are always 8K due to hard coded constants. Replace these constants with definitions. Correct the allowable range of kernel stack pointer values within the allocation. Arrange for the entire kernel stack to be zeroed, not just the upper 4K if CONFIG_DEBUG_STACK_USAGE is set. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/*
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* linux/include/asm-arm/processor.h
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*
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* Copyright (C) 1995-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_PROCESSOR_H
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#define __ASM_ARM_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#ifdef __KERNEL__
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#include <asm/ptrace.h>
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#include <asm/procinfo.h>
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#include <asm/types.h>
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union debug_insn {
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u32 arm;
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u16 thumb;
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};
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struct debug_entry {
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u32 address;
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union debug_insn insn;
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};
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struct debug_info {
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int nsaved;
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struct debug_entry bp[2];
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};
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struct thread_struct {
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/* fault info */
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unsigned long address;
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unsigned long trap_no;
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unsigned long error_code;
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/* debugging */
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struct debug_info debug;
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};
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#define INIT_THREAD { }
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#define start_thread(regs,pc,sp) \
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({ \
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unsigned long *stack = (unsigned long *)sp; \
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set_fs(USER_DS); \
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memzero(regs->uregs, sizeof(regs->uregs)); \
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if (current->personality & ADDR_LIMIT_32BIT) \
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regs->ARM_cpsr = USR_MODE; \
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else \
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regs->ARM_cpsr = USR26_MODE; \
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if (elf_hwcap & HWCAP_THUMB && pc & 1) \
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regs->ARM_cpsr |= PSR_T_BIT; \
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regs->ARM_pc = pc & ~1; /* pc */ \
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regs->ARM_sp = sp; /* sp */ \
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regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
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regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
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regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
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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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extern void release_thread(struct task_struct *);
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/* Prepare to copy thread state - unlazy all lazy status */
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#define prepare_to_copy(tsk) do { } while (0)
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unsigned long get_wchan(struct task_struct *p);
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#define cpu_relax() barrier()
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/*
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* Create a new kernel thread
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*/
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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#define KSTK_REGS(tsk) (((struct pt_regs *)(THREAD_START_SP + (unsigned long)(tsk)->thread_info)) - 1)
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#define KSTK_EIP(tsk) KSTK_REGS(tsk)->ARM_pc
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#define KSTK_ESP(tsk) KSTK_REGS(tsk)->ARM_sp
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/*
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* Prefetching support - only ARMv5.
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*/
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#if __LINUX_ARM_ARCH__ >= 5
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#define ARCH_HAS_PREFETCH
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#define prefetch(ptr) \
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({ \
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__asm__ __volatile__( \
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"pld\t%0" \
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: \
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: "o" (*(char *)(ptr)) \
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: "cc"); \
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})
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#define ARCH_HAS_PREFETCHW
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#define prefetchw(ptr) prefetch(ptr)
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#define ARCH_HAS_SPINLOCK_PREFETCH
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#define spin_lock_prefetch(x) do { } while (0)
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#endif
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#endif
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#endif /* __ASM_ARM_PROCESSOR_H */
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