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0500871f21
Construct the init thread stack in the linker script rather than doing it by means of a union so that ia64's init_task.c can be got rid of. The following symbols are then made available from INIT_TASK_DATA() linker script macro: init_thread_union init_stack INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the size of the init stack. init_thread_union is given its own section so that it can be placed into the stack space in the right order. I'm assuming that the ia64 ordering is correct and that the task_struct is first and the thread_info second. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com> Tested-by: Will Deacon <will.deacon@arm.com> (arm64) Tested-by: Palmer Dabbelt <palmer@sifive.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* MN10300 Low-level thread information
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#include <asm/page.h>
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#ifdef CONFIG_4KSTACKS
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#define THREAD_SIZE (4096)
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#define THREAD_SIZE_ORDER (0)
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#else
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#define THREAD_SIZE (8192)
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#define THREAD_SIZE_ORDER (1)
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#endif
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#define STACK_WARN (THREAD_SIZE / 8)
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants
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* must also be changed
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*/
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct pt_regs *frame; /* current exception frame */
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unsigned long flags; /* low level flags */
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__u32 cpu; /* current CPU */
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__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* thread address space:
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0-0xBFFFFFFF for user-thead
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0-0xFFFFFFFF for kernel-thread
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*/
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__u8 supervisor_stack[0];
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};
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#define thread_info_to_uregs(ti) \
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((struct pt_regs *) \
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((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
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#else /* !__ASSEMBLY__ */
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#ifndef __ASM_OFFSETS_H__
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#include <asm/asm-offsets.h>
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#endif
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#endif
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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}
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#define init_uregs \
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((struct pt_regs *) \
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((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
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extern struct thread_info *__current_ti;
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/* how to get the thread information struct from C */
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static inline __attribute__((const))
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struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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asm("mov sp,%0\n"
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"and %1,%0\n"
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: "=d" (ti)
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: "i" (~(THREAD_SIZE - 1))
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: "cc");
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return ti;
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}
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static inline __attribute__((const))
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struct pt_regs *current_frame(void)
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{
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return current_thread_info()->frame;
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}
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/* how to get the current stack pointer from C */
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static inline unsigned long current_stack_pointer(void)
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{
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unsigned long sp;
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asm("mov sp,%0; ":"=r" (sp));
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return sp;
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}
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#ifndef CONFIG_KGDB
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void arch_release_thread_stack(unsigned long *stack);
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#endif
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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#else /* !__ASSEMBLY__ */
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#ifndef __VMLINUX_LDS__
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/* how to get the thread information struct from ASM */
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.macro GET_THREAD_INFO reg
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mov sp,\reg
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and -THREAD_SIZE,\reg
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.endm
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#endif
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#endif
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to
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* access
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* - pending work-to-be-done flags are in LSW
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* - other flags in MSW
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
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#define _TIF_SYSCALL_TRACE +(1 << TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME +(1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING +(1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED +(1 << TIF_NEED_RESCHED)
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#define _TIF_SINGLESTEP +(1 << TIF_SINGLESTEP)
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#define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG)
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#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
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#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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