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[PATCH] ARM: Fix kernel stack offset calculations

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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>
This commit is contained in:
Russell King
2005-05-05 13:11:00 +01:00
parent 897f5ab2cd
commit 4f7a18124c
7 changed files with 26 additions and 23 deletions
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7
include/asm-arm/processor.h
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@@ -23,8 +23,6 @@
#include <asm/procinfo.h>
#include <asm/types.h>
#define KERNEL_STACK_SIZE PAGE_SIZE
union debug_insn {
u32 arm;
u16 thumb;
@@ -87,8 +85,9 @@ unsigned long get_wchan(struct task_struct *p);
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#define KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1019])
#define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1017])
#define KSTK_REGS(tsk) (((struct pt_regs *)(THREAD_START_SP + (unsigned long)(tsk)->thread_info)) - 1)
#define KSTK_EIP(tsk) KSTK_REGS(tsk)->ARM_pc
#define KSTK_ESP(tsk) KSTK_REGS(tsk)->ARM_sp
/*
* Prefetching support - only ARMv5.