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/* SPDX-License-Identifier: GPL-2.0 */ /* thread_info.h: MIPS low-level thread information * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ #ifndef __ASSEMBLY__ #include <asm/processor.h> /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line * - this struct shares the supervisor stack pages * - if the contents of this structure are changed, the assembly constants * must also be changed */ struct thread_info { struct task_struct *task; /* main task structure */ unsigned long flags; /* low level flags */ unsigned long tp_value; /* thread pointer */ __u32 cpu; /* current CPU */ int preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* * thread address space limit: * 0x7fffffff for user-thead * 0xffffffff for kernel-thread */ struct pt_regs *regs; long syscall; /* syscall number */ }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = _TIF_FIXADE, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ } /* * A pointer to the struct thread_info for the currently executing thread is * held in register $28/$gp. * * We declare __current_thread_info as a global register variable rather than a * local register variable within current_thread_info() because clang doesn't * support explicit local register variables. * * When building the VDSO we take care not to declare the global register * variable because this causes GCC to not preserve the value of $28/$gp in * functions that change its value (which is common in the PIC VDSO when * accessing the GOT). Since the VDSO shouldn't be accessing * __current_thread_info anyway we declare it extern in order to cause a link * failure if it's referenced. */ #ifdef __VDSO__ extern struct thread_info *__current_thread_info; #else register struct thread_info *__current_thread_info __asm__("$28"); #endif static inline struct thread_info *current_thread_info(void) { return __current_thread_info; } #endif /* !__ASSEMBLY__ */ /* thread information allocation */ #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) #define THREAD_SIZE_ORDER (1) #endif #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) #define THREAD_SIZE_ORDER (2) #endif #ifdef CONFIG_PAGE_SIZE_8KB #define THREAD_SIZE_ORDER (1) #endif #ifdef CONFIG_PAGE_SIZE_16KB #define THREAD_SIZE_ORDER (0) #endif #ifdef CONFIG_PAGE_SIZE_32KB #define THREAD_SIZE_ORDER (0) #endif #ifdef CONFIG_PAGE_SIZE_64KB #define THREAD_SIZE_ORDER (0) #endif #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #define THREAD_MASK (THREAD_SIZE - 1UL) #define STACK_WARN (THREAD_SIZE / 8) /* * thread information flags * - these are process state flags that various assembly files may need to * access * - pending work-to-be-done flags are in LSW * - other flags in MSW */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ #define TIF_SECCOMP 4 /* secure computing */ #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ #define TIF_UPROBE 6 /* breakpointed or singlestepping */ #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_NOHZ 19 /* in adaptive nohz mode */ #define TIF_FIXADE 20 /* Fix address errors in software */ #define TIF_LOGADE 21 /* Log address errors to syslog */ #define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ #define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ #define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ #define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ #define TIF_USEDMSA 29 /* MSA has been used this quantum */ #define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_UPROBE (1<<TIF_UPROBE) #define _TIF_USEDFPU (1<<TIF_USEDFPU) #define _TIF_NOHZ (1<<TIF_NOHZ) #define _TIF_FIXADE (1<<TIF_FIXADE) #define _TIF_LOGADE (1<<TIF_LOGADE) #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) #define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) #define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) #define _TIF_USEDMSA (1<<TIF_USEDMSA) #define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ _TIF_SYSCALL_AUDIT | \ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) /* work to do in syscall_trace_leave() */ #define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK \ (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ _TIF_UPROBE) /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ _TIF_WORK_SYSCALL_EXIT | \ _TIF_SYSCALL_TRACEPOINT) /* * We stash processor id into a COP0 register to retrieve it fast * at kernel exception entry. */ #if defined(CONFIG_MIPS_PGD_C0_CONTEXT) #define SMP_CPUID_REG 20, 0 /* XCONTEXT */ #define ASM_SMP_CPUID_REG $20 #define SMP_CPUID_PTRSHIFT 48 #else #define SMP_CPUID_REG 4, 0 /* CONTEXT */ #define ASM_SMP_CPUID_REG $4 #define SMP_CPUID_PTRSHIFT 23 #endif #ifdef CONFIG_64BIT #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) #else #define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) #endif #define ASM_CPUID_MFC0 MFC0 #define UASM_i_CPUID_MFC0 UASM_i_MFC0 #endif /* __KERNEL__ */ #endif /* _ASM_THREAD_INFO_H */
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