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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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2d7d5f0511
This also includes by necessity _TIF_RESTORE_SIGMASK support, which actually resulted in a lot of cleanups. The sparc signal handling code is quite a mess and I should clean it up some day. Signed-off-by: David S. Miller <davem@davemloft.net>
152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/*
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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/btfixup.h>
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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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struct exec_domain *exec_domain; /* execution domain */
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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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/* 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_window 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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struct restart_block restart_block;
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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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* preempt_count needs to be 1 initially, until the scheduler is functional.
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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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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = 1, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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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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#if PAGE_SHIFT == 13
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#define THREAD_INFO_ORDER 0
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#else /* PAGE_SHIFT */
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#define THREAD_INFO_ORDER 1
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#endif
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BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
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#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
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BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
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#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
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#endif /* __ASSEMBLY__ */
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/*
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* Size of kernel stack for each process.
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* Observe the order of get_free_pages() in alloc_thread_info().
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* The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
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*/
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#define THREAD_SIZE 8192
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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_EXECDOMAIN 0x08 /* exec_domain */
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#define TI_FLAGS 0x0c
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#define TI_CPU 0x10
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#define TI_PREEMPT 0x14 /* preempt_count */
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#define TI_SOFTIRQ 0x18 /* softirq_count */
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#define TI_HARDIRQ 0x1c /* 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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/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
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#define PREEMPT_ACTIVE 0x4000000
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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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/* flag bit 1 is available */
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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
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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_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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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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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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