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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>
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* thread_info.h: sparc low-level thread information
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* adapted from the ppc version by Pete Zaitcev, which was
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* adapted from the i386 version by Paul Mackerras
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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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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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/page.h>
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/*
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* Low level task data.
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*
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* If you change this, change the TI_* offsets below to match.
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*/
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#define NSWINS 8
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struct thread_info {
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unsigned long uwinmask;
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struct task_struct *task; /* main task structure */
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unsigned long flags; /* low level flags */
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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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int softirq_count;
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int hardirq_count;
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u32 __unused;
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/* Context switch saved kernel state. */
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unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
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unsigned long kpc;
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unsigned long kpsr;
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unsigned long kwim;
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/* A place to store user windows and stack pointers
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* when the stack needs inspection.
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*/
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struct reg_window32 reg_window[NSWINS]; /* align for ldd! */
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unsigned long rwbuf_stkptrs[NSWINS];
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unsigned long w_saved;
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};
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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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#define INIT_THREAD_INFO(tsk) \
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{ \
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.uwinmask = 0, \
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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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}
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/* how to get the thread information struct from C */
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register struct thread_info *current_thread_info_reg asm("g6");
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#define current_thread_info() (current_thread_info_reg)
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/*
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* thread information allocation
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*/
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#define THREAD_SIZE_ORDER 1
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#endif /* __ASSEMBLY__ */
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/* Size of kernel stack for each process */
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#define THREAD_SIZE (2 * PAGE_SIZE)
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/*
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* Offsets in thread_info structure, used in assembly code
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* The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
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*/
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#define TI_UWINMASK 0x00 /* uwinmask */
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#define TI_TASK 0x04
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#define TI_FLAGS 0x08
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#define TI_CPU 0x0c
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#define TI_PREEMPT 0x10 /* preempt_count */
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#define TI_SOFTIRQ 0x14 /* softirq_count */
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#define TI_HARDIRQ 0x18 /* hardirq_count */
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#define TI_KSP 0x20 /* ksp */
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#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
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#define TI_KPSR 0x28 /* kpsr */
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#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
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#define TI_REG_WINDOW 0x30
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#define TI_RWIN_SPTRS 0x230
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#define TI_W_SAVED 0x250
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/*
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* thread information flag bit numbers
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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 /* callback before returning to user */
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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_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
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#define TIF_USEDFPU 8 /* FPU was used by this task
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* this quantum (SMP) */
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#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
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* TIF_NEED_RESCHED */
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#define TIF_MEMDIE 10 /* is terminating due to OOM killer */
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/* as above, but as bit values */
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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_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
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_TIF_SIGPENDING)
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#define is_32bit_task() (1)
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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