9372450cc2
Add the CONFIG_DEBUG_STACKOVERFLOW config option to enable checks to detect kernel stack overflows. Stack overflows can not be detected reliable since we do not want to introduce too much overhead. Instead, during irq processing in do_cpu_irq_mask() we check kernel stack usage of the interrupted kernel process. Kernel threads can be easily detected by checking the value of space register 7 (sr7) which is zero when running inside the kernel. Since THREAD_SIZE is 16k and PAGE_SIZE is 4k, reduce the alignment of the init thread to the lower value (PAGE_SIZE) in the kernel vmlinux.ld.S linker script. Signed-off-by: Helge Deller <deller@gmx.de>
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
#ifndef _ASM_PARISC_THREAD_INFO_H
|
|
#define _ASM_PARISC_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/processor.h>
|
|
#include <asm/special_insns.h>
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain;/* execution domain */
|
|
unsigned long flags; /* thread_info flags (see TIF_*) */
|
|
mm_segment_t addr_limit; /* user-level address space limit */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
|
|
struct restart_block restart_block;
|
|
};
|
|
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall \
|
|
} \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
/* how to get the thread information struct from C */
|
|
#define current_thread_info() ((struct thread_info *)mfctl(30))
|
|
|
|
#endif /* !__ASSEMBLY */
|
|
|
|
/* thread information allocation */
|
|
|
|
#define THREAD_SIZE_ORDER 2 /* PA-RISC requires at least 16k stack */
|
|
/* Be sure to hunt all references to this down when you change the size of
|
|
* the kernel stack */
|
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
|
#define THREAD_SHIFT (PAGE_SHIFT + THREAD_SIZE_ORDER)
|
|
|
|
#define PREEMPT_ACTIVE_BIT 28
|
|
#define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
|
|
|
|
/*
|
|
* thread information flags
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_SIGPENDING 1 /* signal pending */
|
|
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
|
|
#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_32BIT 4 /* 32 bit binary */
|
|
#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
|
|
#define TIF_RESTORE_SIGMASK 6 /* restore saved signal mask */
|
|
#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
|
|
#define TIF_SINGLESTEP 9 /* single stepping? */
|
|
#define TIF_BLOCKSTEP 10 /* branch stepping? */
|
|
|
|
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
|
|
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
|
|
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
|
|
#define _TIF_32BIT (1 << TIF_32BIT)
|
|
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
|
|
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
|
|
#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
|
|
|
|
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
|
|
_TIF_NEED_RESCHED)
|
|
#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
|
|
_TIF_BLOCKSTEP)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_PARISC_THREAD_INFO_H */
|