16f719de62
With gcc 4.3 and later, a pointer that has already been dereferenced is assumed not to be null since it should have caused a segmentation fault otherwise, hence any subsequent test against NULL is optimized away. Current inline asm constraint used in the implementation of prefetch() makes gcc believe that the pointer is dereferenced even though the PLD instruction does not load any data and does not cause a segmentation fault on null pointers, which causes all sorts of interesting results when reaching the end of a linked lists for example. Let's use a better constraint to properly represent the actual usage of the pointer value. Problem reported by Chris Steel. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/*
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* arch/arm/include/asm/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/types.h>
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#ifdef __KERNEL__
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#define STACK_TOP ((current->personality == PER_LINUX_32BIT) ? \
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TASK_SIZE : TASK_SIZE_26)
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#define STACK_TOP_MAX TASK_SIZE
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#endif
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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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#ifdef CONFIG_MMU
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#define nommu_start_thread(regs) do { } while (0)
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#else
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#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
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#endif
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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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nommu_start_thread(regs); \
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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 task_pt_regs(p) \
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((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
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#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
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#define KSTK_ESP(tsk) task_pt_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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static inline void prefetch(const void *ptr)
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{
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__asm__ __volatile__(
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"pld\t%a0"
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:
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: "p" (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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