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193 lines
6.5 KiB
193 lines
6.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* thread_info.h: MIPS low-level thread information |
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* |
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* Copyright (C) 2002 David Howells ([email protected]) |
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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/processor.h> |
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/* |
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* low level task data that entry.S needs immediate access to |
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* - this struct should fit entirely inside of one cache line |
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* - this struct shares the supervisor stack pages |
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* - if the contents of this structure are changed, the assembly constants |
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* must also be changed |
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*/ |
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struct thread_info { |
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struct task_struct *task; /* main task structure */ |
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unsigned long flags; /* low level flags */ |
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unsigned long tp_value; /* thread pointer */ |
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__u32 cpu; /* current CPU */ |
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int preempt_count; /* 0 => preemptable, <0 => BUG */ |
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struct pt_regs *regs; |
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long syscall; /* syscall number */ |
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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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.flags = _TIF_FIXADE, \ |
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.cpu = 0, \ |
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.preempt_count = INIT_PREEMPT_COUNT, \ |
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} |
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/* |
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* A pointer to the struct thread_info for the currently executing thread is |
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* held in register $28/$gp. |
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* |
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* We declare __current_thread_info as a global register variable rather than a |
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* local register variable within current_thread_info() because clang doesn't |
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* support explicit local register variables. |
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* |
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* When building the VDSO we take care not to declare the global register |
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* variable because this causes GCC to not preserve the value of $28/$gp in |
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* functions that change its value (which is common in the PIC VDSO when |
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* accessing the GOT). Since the VDSO shouldn't be accessing |
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* __current_thread_info anyway we declare it extern in order to cause a link |
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* failure if it's referenced. |
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*/ |
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#ifdef __VDSO__ |
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extern struct thread_info *__current_thread_info; |
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#else |
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register struct thread_info *__current_thread_info __asm__("$28"); |
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#endif |
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static inline struct thread_info *current_thread_info(void) |
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{ |
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return __current_thread_info; |
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} |
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#endif /* !__ASSEMBLY__ */ |
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/* thread information allocation */ |
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#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
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#define THREAD_SIZE_ORDER (1) |
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#endif |
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#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
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#define THREAD_SIZE_ORDER (2) |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_8KB |
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#define THREAD_SIZE_ORDER (1) |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_16KB |
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#define THREAD_SIZE_ORDER (0) |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_32KB |
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#define THREAD_SIZE_ORDER (0) |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_64KB |
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#define THREAD_SIZE_ORDER (0) |
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#endif |
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
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#define THREAD_MASK (THREAD_SIZE - 1UL) |
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#define STACK_WARN (THREAD_SIZE / 8) |
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/* |
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* thread information flags |
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* - these are process state flags that various assembly files may need to |
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* access |
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* - pending work-to-be-done flags are in LSW |
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* - other flags in MSW |
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*/ |
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#define TIF_SIGPENDING 1 /* signal pending */ |
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
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#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ |
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#define TIF_SECCOMP 4 /* secure computing */ |
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#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ |
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#define TIF_UPROBE 6 /* breakpointed or singlestepping */ |
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#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ |
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#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ |
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#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ |
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
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#define TIF_NOHZ 19 /* in adaptive nohz mode */ |
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#define TIF_FIXADE 20 /* Fix address errors in software */ |
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#define TIF_LOGADE 21 /* Log address errors to syslog */ |
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#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */ |
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#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ |
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#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ |
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#define TIF_LOAD_WATCH 25 /* If set, load watch registers */ |
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#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */ |
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#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */ |
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#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */ |
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#define TIF_USEDMSA 29 /* MSA has been used this quantum */ |
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#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */ |
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#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
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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_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
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#define _TIF_SECCOMP (1<<TIF_SECCOMP) |
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
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#define _TIF_UPROBE (1<<TIF_UPROBE) |
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#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
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#define _TIF_USEDFPU (1<<TIF_USEDFPU) |
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#define _TIF_NOHZ (1<<TIF_NOHZ) |
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#define _TIF_FIXADE (1<<TIF_FIXADE) |
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#define _TIF_LOGADE (1<<TIF_LOGADE) |
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#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) |
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#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) |
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#define _TIF_FPUBOUND (1<<TIF_FPUBOUND) |
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#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) |
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#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS) |
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#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS) |
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#define _TIF_USEDMSA (1<<TIF_USEDMSA) |
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#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE) |
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
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#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ |
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_TIF_SYSCALL_AUDIT | \ |
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_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) |
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/* work to do in syscall_trace_leave() */ |
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#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \ |
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_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT) |
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/* work to do on interrupt/exception return */ |
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#define _TIF_WORK_MASK \ |
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(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \ |
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_TIF_UPROBE | _TIF_NOTIFY_SIGNAL) |
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/* work to do on any return to u-space */ |
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#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \ |
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_TIF_WORK_SYSCALL_EXIT | \ |
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_TIF_SYSCALL_TRACEPOINT) |
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/* |
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* We stash processor id into a COP0 register to retrieve it fast |
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* at kernel exception entry. |
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*/ |
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#if defined(CONFIG_MIPS_PGD_C0_CONTEXT) |
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#define SMP_CPUID_REG 20, 0 /* XCONTEXT */ |
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#define ASM_SMP_CPUID_REG $20 |
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#define SMP_CPUID_PTRSHIFT 48 |
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#else |
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#define SMP_CPUID_REG 4, 0 /* CONTEXT */ |
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#define ASM_SMP_CPUID_REG $4 |
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#define SMP_CPUID_PTRSHIFT 23 |
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#endif |
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#ifdef CONFIG_64BIT |
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#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3) |
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#else |
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#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2) |
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#endif |
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#define ASM_CPUID_MFC0 MFC0 |
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#define UASM_i_CPUID_MFC0 UASM_i_MFC0 |
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#endif /* __KERNEL__ */ |
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#endif /* _ASM_THREAD_INFO_H */
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