194 lines
6.1 KiB
C
194 lines
6.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/* thread_info.h: PowerPC low-level thread information
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* adapted from the i386 version by Paul Mackerras
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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#ifndef _ASM_POWERPC_THREAD_INFO_H
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#define _ASM_POWERPC_THREAD_INFO_H
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#include <asm/asm-const.h>
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#include <asm/page.h>
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#ifdef __KERNEL__
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#ifdef CONFIG_KASAN
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#define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1)
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#else
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#define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT
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#endif
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#if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT
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#define THREAD_SHIFT PAGE_SHIFT
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#else
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#define THREAD_SHIFT MIN_THREAD_SHIFT
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#endif
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#define THREAD_SIZE (1 << THREAD_SHIFT)
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/*
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* By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
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* checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
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* assembly.
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*/
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#ifdef CONFIG_VMAP_STACK
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#define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1)
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#else
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#define THREAD_ALIGN_SHIFT THREAD_SHIFT
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#endif
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#define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT)
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#ifndef __ASSEMBLY__
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#include <linux/cache.h>
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#include <asm/processor.h>
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#include <asm/accounting.h>
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#define SLB_PRELOAD_NR 16U
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/*
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* low level task data.
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*/
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struct thread_info {
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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#ifdef CONFIG_SMP
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unsigned int cpu;
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#endif
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unsigned long local_flags; /* private flags for thread */
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#ifdef CONFIG_LIVEPATCH_64
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unsigned long *livepatch_sp;
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#endif
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#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
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struct cpu_accounting_data accounting;
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#endif
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unsigned char slb_preload_nr;
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unsigned char slb_preload_tail;
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u32 slb_preload_esid[SLB_PRELOAD_NR];
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/* low level flags - has atomic operations done on it */
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unsigned long flags ____cacheline_aligned_in_smp;
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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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.preempt_count = INIT_PREEMPT_COUNT, \
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.flags = 0, \
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}
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#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
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/* how to get the thread information struct from C */
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
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void arch_setup_new_exec(void);
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#define arch_setup_new_exec arch_setup_new_exec
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#endif /* __ASSEMBLY__ */
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/*
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* thread information flag bit numbers
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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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_NOTIFY_SIGNAL 3 /* signal notifications exist */
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#define TIF_SYSCALL_EMU 4 /* syscall emulation active */
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#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
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#define TIF_PATCH_PENDING 6 /* pending live patching update */
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
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#define TIF_SINGLESTEP 8 /* singlestepping active */
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#define TIF_SECCOMP 10 /* secure computing */
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#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
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#define TIF_NOERROR 12 /* Force successful syscall return */
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#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
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#define TIF_UPROBE 14 /* breakpointed or single-stepping */
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#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
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#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
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for stack store? */
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#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
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#if defined(CONFIG_PPC64)
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#define TIF_ELF2ABI 18 /* function descriptors must die! */
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#endif
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#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_32BIT 20 /* 32 bit binary */
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/* as above, but as bit values */
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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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_32BIT (1<<TIF_32BIT)
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#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
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#define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
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#define _TIF_NOERROR (1<<TIF_NOERROR)
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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_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
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#define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
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#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
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_TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
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_TIF_SYSCALL_EMU)
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#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
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_TIF_NOTIFY_RESUME | _TIF_UPROBE | \
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_TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
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_TIF_NOTIFY_SIGNAL)
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#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
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/* Bits in local_flags */
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/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
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#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
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#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
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#define TLF_LAZY_MMU 3 /* tlb_batch is active */
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#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
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#define _TLF_NAPPING (1 << TLF_NAPPING)
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#define _TLF_SLEEPING (1 << TLF_SLEEPING)
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#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
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#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
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#ifndef __ASSEMBLY__
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static inline void clear_thread_local_flags(unsigned int flags)
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{
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struct thread_info *ti = current_thread_info();
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ti->local_flags &= ~flags;
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}
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static inline bool test_thread_local_flags(unsigned int flags)
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{
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struct thread_info *ti = current_thread_info();
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return (ti->local_flags & flags) != 0;
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}
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#ifdef CONFIG_COMPAT
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#define is_32bit_task() (test_thread_flag(TIF_32BIT))
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#define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT))
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#else
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#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
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#define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32))
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#endif
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#if defined(CONFIG_PPC64)
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#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
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#else
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#define is_elf2_task() (0)
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#endif
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_THREAD_INFO_H */
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