198 lines
6.6 KiB
C
198 lines
6.6 KiB
C
/* 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 => preemptible, <0 => BUG */
|
|
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, \
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_HAS_CURRENT_STACK_POINTER
|
|
register unsigned long current_stack_pointer __asm__("sp");
|
|
#endif
|
|
|
|
#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 */
|