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>
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ALPHA_THREAD_INFO_H
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#define _ALPHA_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/types.h>
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#include <asm/hwrpb.h>
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#include <asm/sysinfo.h>
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#endif
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#ifndef __ASSEMBLY__
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struct thread_info {
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struct pcb_struct pcb; /* palcode state */
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struct task_struct *task; /* main task structure */
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unsigned int flags; /* low level flags */
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unsigned int ieee_state; /* see fpu.h */
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mm_segment_t addr_limit; /* thread address space */
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unsigned cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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unsigned int status; /* thread-synchronous flags */
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int bpt_nsaved;
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unsigned long bpt_addr[2]; /* breakpoint handling */
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unsigned int bpt_insn[2];
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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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.task = &tsk, \
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.addr_limit = KERNEL_DS, \
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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 __asm__("$8");
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#define current_thread_info() __current_thread_info
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#endif /* __ASSEMBLY__ */
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/* Thread information allocation. */
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (2*PAGE_SIZE)
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/*
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* Thread information flags:
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* - these are process state flags and used from assembly
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* - pending work-to-be-done flags come first and must be assigned to be
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* within bits 0 to 7 to fit in and immediate operand.
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*
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* TIF_SYSCALL_TRACE is known to be 0 via blbs.
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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_SYSCALL_AUDIT 4 /* syscall audit active */
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#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
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#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
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#define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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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_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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/* Work to do on interrupt/exception return. */
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#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
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_TIF_NOTIFY_RESUME)
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/* Work to do on any return to userspace. */
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#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
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| _TIF_SYSCALL_TRACE)
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#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
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#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
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#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
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#define SET_UNALIGN_CTL(task,value) ({ \
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__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
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if (value & PR_UNALIGN_NOPRINT) \
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status |= TS_UAC_NOPRINT; \
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if (value & PR_UNALIGN_SIGBUS) \
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status |= TS_UAC_SIGBUS; \
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if (value & 4) /* alpha-specific */ \
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status |= TS_UAC_NOFIX; \
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task_thread_info(task)->status = status; \
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0; })
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#define GET_UNALIGN_CTL(task,value) ({ \
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__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
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__u32 res = 0; \
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if (status & TS_UAC_NOPRINT) \
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res |= PR_UNALIGN_NOPRINT; \
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if (status & TS_UAC_SIGBUS) \
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res |= PR_UNALIGN_SIGBUS; \
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if (status & TS_UAC_NOFIX) \
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res |= 4; \
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put_user(res, (int __user *)(value)); \
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})
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#endif /* __KERNEL__ */
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#endif /* _ALPHA_THREAD_INFO_H */
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