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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
*/
#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_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_NOTIFY_SIGNAL 3 /* signal notifications exist */
#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_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
#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 | _TIF_NOTIFY_SIGNAL)
/* 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 /* __ASM_SH_THREAD_INFO_H */
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