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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>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* linux/arch/unicore32/include/asm/thread_info.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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 __UNICORE_THREAD_INFO_H__
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#define __UNICORE_THREAD_INFO_H__
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#include <asm/fpstate.h>
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192
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#define THREAD_START_SP (THREAD_SIZE - 8)
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#ifndef __ASSEMBLY__
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struct task_struct;
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#include <asm/types.h>
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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 cpu_context_save {
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__u32 r4;
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__u32 r5;
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__u32 r6;
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__u32 r7;
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__u32 r8;
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__u32 r9;
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__u32 r10;
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__u32 r11;
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__u32 r12;
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__u32 r13;
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__u32 r14;
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__u32 r15;
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__u32 r16;
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__u32 r17;
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__u32 r18;
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__u32 r19;
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__u32 r20;
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__u32 r21;
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__u32 r22;
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__u32 r23;
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__u32 r24;
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__u32 r25;
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__u32 r26;
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__u32 fp;
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__u32 sp;
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__u32 pc;
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};
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/*
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* low level task data that entry.S needs immediate access to.
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* __switch_to() assumes cpu_context follows immediately after cpu_domain.
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*/
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struct thread_info {
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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable */
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/* <0 => bug */
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mm_segment_t addr_limit; /* address limit */
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struct task_struct *task; /* main task structure */
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__u32 cpu; /* cpu */
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struct cpu_context_save cpu_context; /* cpu context */
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__u32 syscall; /* syscall number */
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__u8 used_cp[16]; /* thread used copro */
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#ifdef CONFIG_UNICORE_FPU_F64
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struct fp_state fpstate __attribute__((aligned(8)));
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#endif
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};
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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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.preempt_count = INIT_PREEMPT_COUNT, \
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.addr_limit = KERNEL_DS, \
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}
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/*
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* how to get the thread information struct from C
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*/
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static inline struct thread_info *current_thread_info(void) __attribute_const__;
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static inline struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm ("sp");
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return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
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}
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#define thread_saved_pc(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
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#define thread_saved_sp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
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#define thread_saved_fp(tsk) \
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((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
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#endif
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/*
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* thread information flags:
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* TIF_SYSCALL_TRACE - syscall trace active
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* TIF_SIGPENDING - signal pending
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* TIF_NEED_RESCHED - rescheduling necessary
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* TIF_NOTIFY_RESUME - callback before returning to user
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*/
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#define TIF_SIGPENDING 0
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#define TIF_NEED_RESCHED 1
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#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
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#define TIF_SYSCALL_TRACE 8
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#define TIF_MEMDIE 18
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#define TIF_RESTORE_SIGMASK 20
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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_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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/*
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* Change these and you break ASM code in entry-common.S
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*/
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#define _TIF_WORK_MASK \
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(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
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#endif /* __KERNEL__ */
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#endif /* __UNICORE_THREAD_INFO_H__ */
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