1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * thread_info.h: sparc low-level thread information 4 * adapted from the ppc version by Pete Zaitcev, which was 5 * adapted from the i386 version by Paul Mackerras 6 * 7 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 8 * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com) 9 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 10 */ 11 12 #ifndef _ASM_THREAD_INFO_H 13 #define _ASM_THREAD_INFO_H 14 15 #ifdef __KERNEL__ 16 17 #ifndef __ASSEMBLY__ 18 19 #include <asm/ptrace.h> 20 #include <asm/page.h> 21 22 /* 23 * Low level task data. 24 * 25 * If you change this, change the TI_* offsets below to match. 26 */ 27 #define NSWINS 8 28 struct thread_info { 29 unsigned long uwinmask; 30 struct task_struct *task; /* main task structure */ 31 unsigned long flags; /* low level flags */ 32 int cpu; /* cpu we're on */ 33 int preempt_count; /* 0 => preemptable, 34 <0 => BUG */ 35 int softirq_count; 36 int hardirq_count; 37 38 u32 __unused; 39 40 /* Context switch saved kernel state. */ 41 unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */ 42 unsigned long kpc; 43 unsigned long kpsr; 44 unsigned long kwim; 45 46 /* A place to store user windows and stack pointers 47 * when the stack needs inspection. 48 */ 49 struct reg_window32 reg_window[NSWINS]; /* align for ldd! */ 50 unsigned long rwbuf_stkptrs[NSWINS]; 51 unsigned long w_saved; 52 }; 53 54 /* 55 * macros/functions for gaining access to the thread information structure 56 */ 57 #define INIT_THREAD_INFO(tsk) \ 58 { \ 59 .uwinmask = 0, \ 60 .task = &tsk, \ 61 .flags = 0, \ 62 .cpu = 0, \ 63 .preempt_count = INIT_PREEMPT_COUNT, \ 64 } 65 66 #define init_thread_info (init_thread_union.thread_info) 67 #define init_stack (init_thread_union.stack) 68 69 /* how to get the thread information struct from C */ 70 register struct thread_info *current_thread_info_reg asm("g6"); 71 #define current_thread_info() (current_thread_info_reg) 72 73 /* 74 * thread information allocation 75 */ 76 #define THREAD_SIZE_ORDER 1 77 78 #endif /* __ASSEMBLY__ */ 79 80 /* Size of kernel stack for each process */ 81 #define THREAD_SIZE (2 * PAGE_SIZE) 82 83 /* 84 * Offsets in thread_info structure, used in assembly code 85 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications. 86 */ 87 #define TI_UWINMASK 0x00 /* uwinmask */ 88 #define TI_TASK 0x04 89 #define TI_FLAGS 0x08 90 #define TI_CPU 0x0c 91 #define TI_PREEMPT 0x10 /* preempt_count */ 92 #define TI_SOFTIRQ 0x14 /* softirq_count */ 93 #define TI_HARDIRQ 0x18 /* hardirq_count */ 94 #define TI_KSP 0x20 /* ksp */ 95 #define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */ 96 #define TI_KPSR 0x28 /* kpsr */ 97 #define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */ 98 #define TI_REG_WINDOW 0x30 99 #define TI_RWIN_SPTRS 0x230 100 #define TI_W_SAVED 0x250 101 102 /* 103 * thread information flag bit numbers 104 */ 105 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 106 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 107 #define TIF_SIGPENDING 2 /* signal pending */ 108 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 109 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ 110 #define TIF_USEDFPU 8 /* FPU was used by this task 111 * this quantum (SMP) */ 112 #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling 113 * TIF_NEED_RESCHED */ 114 #define TIF_MEMDIE 10 /* is terminating due to OOM killer */ 115 116 /* as above, but as bit values */ 117 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 118 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 119 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 120 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 121 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 122 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 123 124 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \ 125 _TIF_SIGPENDING) 126 127 #define is_32bit_task() (1) 128 129 #endif /* __KERNEL__ */ 130 131 #endif /* _ASM_THREAD_INFO_H */ 132