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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ALPHA_THREAD_INFO_H
#define _ALPHA_THREAD_INFO_H
#ifdef __KERNEL__
#ifndef __ASSEMBLER__
#include <asm/processor.h>
#include <asm/types.h>
#include <asm/hwrpb.h>
#include <asm/sysinfo.h>
#endif
#ifndef __ASSEMBLER__
struct thread_info {
struct pcb_struct pcb; /* palcode state */
struct task_struct *task; /* main task structure */
unsigned int flags; /* low level flags */
unsigned int ieee_state; /* see fpu.h */
unsigned cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
unsigned int status; /* thread-synchronous flags */
int bpt_nsaved;
unsigned long bpt_addr[2]; /* breakpoint handling */
unsigned int bpt_insn[2];
unsigned long fp[32];
};
/*
* Macros/functions for gaining access to the thread information structure.
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
/* How to get the thread information struct from C. */
register struct thread_info *__current_thread_info __asm__("$8");
#define current_thread_info() __current_thread_info
register unsigned long *current_stack_pointer __asm__ ("$30");
#endif /* __ASSEMBLER__ */
/* Thread information allocation. */
#define THREAD_SIZE_ORDER 1
#define THREAD_SIZE (2*PAGE_SIZE)
/*
* Thread information flags:
* - these are process state flags and used from assembly
* - pending work-to-be-done flags come first and must be assigned to be
* within bits 0 to 7 to fit in and immediate operand.
*
* (Historically TIF_SYSCALL_TRACE was known to be 0 via blbs, but we may
* also test multiple bits via masks now.)
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_SYSCALL_AUDIT 4 /* syscall audit active */
#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
#define TIF_SECCOMP 6 /* seccomp syscall filtering active */
#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
#define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */
#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_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
/*
* Work to do on syscall entry (in entry.S).
* If you want this to exactly mirror what entry.S checks, keep it aligned
* with the mask used before branching to syscall_trace_enter().
*/
#ifdef CONFIG_AUDITSYSCALL
# define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
#else
# define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SECCOMP)
#endif
/* Work to do on interrupt/exception return. */
#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
_TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
#define TS_SAVED_FP 0x0008
#define TS_RESTORE_FP 0x0010
#define SET_UNALIGN_CTL(task,value) ({ \
__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
if (value & PR_UNALIGN_NOPRINT) \
status |= TS_UAC_NOPRINT; \
if (value & PR_UNALIGN_SIGBUS) \
status |= TS_UAC_SIGBUS; \
if (value & 4) /* alpha-specific */ \
status |= TS_UAC_NOFIX; \
task_thread_info(task)->status = status; \
0; })
#define GET_UNALIGN_CTL(task,value) ({ \
__u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
__u32 res = 0; \
if (status & TS_UAC_NOPRINT) \
res |= PR_UNALIGN_NOPRINT; \
if (status & TS_UAC_SIGBUS) \
res |= PR_UNALIGN_SIGBUS; \
if (status & TS_UAC_NOFIX) \
res |= 4; \
put_user(res, (int __user *)(value)); \
})
#ifndef __ASSEMBLER__
extern void __save_fpu(void);
static inline void save_fpu(void)
{
if (!(current_thread_info()->status & TS_SAVED_FP)) {
current_thread_info()->status |= TS_SAVED_FP;
__save_fpu();
}
}
#endif
#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */
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