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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_SH_THREAD_INFO_H #define __ASM_SH_THREAD_INFO_H /* SuperH version * Copyright (C) 2002 Niibe Yutaka * * The copyright of original i386 version is: * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifdef __KERNEL__ #include <asm/page.h> /* * Page fault error code bits */ #define FAULT_CODE_WRITE (1 << 0) /* write access */ #define FAULT_CODE_INITIAL (1 << 1) /* initial page write */ #define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */ #define FAULT_CODE_PROT (1 << 3) /* protection fault */ #define FAULT_CODE_USER (1 << 4) /* user-mode access */ #ifndef __ASSEMBLY__ #include <asm/processor.h> struct thread_info { struct task_struct *task; /* main task structure */ unsigned long flags; /* low level flags */ __u32 status; /* thread synchronous flags */ __u32 cpu; int preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* thread address space */ unsigned long previous_sp; /* sp of previous stack in case of nested IRQ stacks */ __u8 supervisor_stack[0]; }; #endif #if defined(CONFIG_4KSTACKS) #define THREAD_SHIFT 12 #else #define THREAD_SHIFT 13 #endif #define THREAD_SIZE (1 << THREAD_SHIFT) #define STACK_WARN (THREAD_SIZE >> 3) /* * macros/functions for gaining access to the thread information structure */ #ifndef __ASSEMBLY__ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = 0, \ .status = 0, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ } /* how to get the current stack pointer from C */ register unsigned long current_stack_pointer asm("r15") __used; /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; #if defined(CONFIG_SUPERH64) __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); #elif defined(CONFIG_CPU_HAS_SR_RB) __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); #else unsigned long __dummy; __asm__ __volatile__ ( "mov r15, %0\n\t" "and %1, %0\n\t" : "=&r" (ti), "=r" (__dummy) : "1" (~(THREAD_SIZE - 1)) : "memory"); #endif return ti; } #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) extern void arch_task_cache_init(void); extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); extern void arch_release_task_struct(struct task_struct *tsk); extern void init_thread_xstate(void); #endif /* __ASSEMBLY__ */ /* * Thread information flags * * - Limited to 24 bits, upper byte used for fault code encoding. * * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or * we blow the tst immediate size constraints and need to fix up * arch/sh/kernel/entry-common.S. */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_SINGLESTEP 4 /* singlestepping active */ #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ #define TIF_SECCOMP 6 /* secure computing */ #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) /* work to do in syscall trace */ #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ _TIF_SYSCALL_TRACEPOINT) /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ _TIF_SYSCALL_TRACEPOINT) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) /* * Thread-synchronous status. * * This is different from the flags in that nobody else * ever touches our thread-synchronous status, so we don't * have to worry about atomic accesses. */ #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ #ifndef __ASSEMBLY__ #define TI_FLAG_FAULT_CODE_SHIFT 24 /* * Additional thread flag encoding */ static inline void set_thread_fault_code(unsigned int val) { struct thread_info *ti = current_thread_info(); ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) | (val << TI_FLAG_FAULT_CODE_SHIFT); } static inline unsigned int get_thread_fault_code(void) { struct thread_info *ti = current_thread_info(); return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; } #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* __ASM_SH_THREAD_INFO_H */
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