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Diffstat (limited to 'arch/mips/include/asm/thread_info.h')
| -rw-r--r-- | arch/mips/include/asm/thread_info.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h new file mode 100644 index 000000000..e2c352da3 --- /dev/null +++ b/arch/mips/include/asm/thread_info.h @@ -0,0 +1,199 @@ +/* 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_NOTIFY_SIGNAL 7 /* signal notifications exist */ +#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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) +#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 | _TIF_NOTIFY_SIGNAL) +/* 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 */ |