/* SPDX-License-Identifier: GPL-2.0 */ /* thread_info.h: PowerPC low-level thread information * adapted from the i386 version by Paul Mackerras * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifndef _ASM_POWERPC_THREAD_INFO_H #define _ASM_POWERPC_THREAD_INFO_H #include <asm/asm-const.h> #include <asm/page.h> #ifdef __KERNEL__ #if defined(CONFIG_KASAN) && CONFIG_THREAD_SHIFT < 15 #define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1) #else #define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT #endif #if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT #define THREAD_SHIFT PAGE_SHIFT #else #define THREAD_SHIFT MIN_THREAD_SHIFT #endif #define THREAD_SIZE (1 << THREAD_SHIFT) /* * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry * assembly. */ #ifdef CONFIG_VMAP_STACK #define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1) #else #define THREAD_ALIGN_SHIFT THREAD_SHIFT #endif #define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT) #ifndef __ASSEMBLER__ #include <linux/cache.h> #include <asm/processor.h> #include <asm/accounting.h> #include <asm/ppc_asm.h> #define SLB_PRELOAD_NR 16U /* * low level task data. */ struct thread_info { int preempt_count; /* 0 => preemptable, <0 => BUG */ #ifdef CONFIG_SMP unsigned int cpu; #endif unsigned long local_flags; /* private flags for thread */ #ifdef CONFIG_LIVEPATCH_64 unsigned long *livepatch_sp; #endif #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) struct cpu_accounting_data accounting; #endif unsigned char slb_preload_nr; unsigned char slb_preload_tail; u32 slb_preload_esid[SLB_PRELOAD_NR]; /* low level flags - has atomic operations done on it */ unsigned long flags ____cacheline_aligned_in_smp; }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .preempt_count = INIT_PREEMPT_COUNT, \ .flags = 0, \ } #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) /* how to get the thread information struct from C */ extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); void arch_setup_new_exec(void); #define arch_setup_new_exec arch_setup_new_exec #endif /* __ASSEMBLER__ */ /* * thread information flag bit numbers */ #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_SYSCALL_EMU 4 /* syscall emulation active */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ #define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ #define TIF_NEED_RESCHED_LAZY 9 /* Scheduler driven lazy preemption */ #define TIF_SECCOMP 10 /* secure computing */ #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ #define TIF_NOERROR 12 /* Force successful syscall return */ #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ #define TIF_UPROBE 14 /* breakpointed or single-stepping */ #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation for stack store? */ #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ #if defined(CONFIG_PPC64) #define TIF_ELF2ABI 18 /* function descriptors must die! */ #endif #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_32BIT 20 /* 32 bit binary */ /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY) #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_32BIT (1<<TIF_32BIT) #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) #define _TIF_NOERROR (1<<TIF_NOERROR) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_UPROBE (1<<TIF_UPROBE) #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ _TIF_SYSCALL_EMU) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NEED_RESCHED_LAZY | _TIF_NOTIFY_RESUME | \ _TIF_UPROBE | _TIF_RESTORE_TM | \ _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) /* Bits in local_flags */ /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ #define _TLF_NAPPING (1 << TLF_NAPPING) #define _TLF_SLEEPING (1 << TLF_SLEEPING) #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) #ifndef __ASSEMBLER__ static inline void clear_thread_local_flags(unsigned int flags) { struct thread_info *ti = current_thread_info(); ti->local_flags &= ~flags; } static inline bool test_thread_local_flags(unsigned int flags) { struct thread_info *ti = current_thread_info(); return (ti->local_flags & flags) != 0; } #ifdef CONFIG_COMPAT #define is_32bit_task() (test_thread_flag(TIF_32BIT)) #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) #define clear_tsk_compat_task(tsk) (clear_tsk_thread_flag(p, TIF_32BIT)) #else #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) #define clear_tsk_compat_task(tsk) do { } while (0) #endif #if defined(CONFIG_PPC64) #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) #else #define is_elf2_task() (0) #endif /* * Walks up the stack frames to make sure that the specified object is * entirely contained by a single stack frame. * * Returns: * GOOD_FRAME if within a frame * BAD_STACK if placed across a frame boundary (or outside stack) */ static inline int arch_within_stack_frames(const void * const stack, const void * const stackend, const void *obj, unsigned long len) { const void *params; const void *frame; params = *(const void * const *)current_stack_pointer + STACK_FRAME_PARAMS; frame = **(const void * const * const *)current_stack_pointer; /* * low -----------------------------------------------------------> high * [backchain][metadata][params][local vars][saved registers][backchain] * ^------------------------------------^ * | allows copies only in this region | * | | * params frame * The metadata region contains the saved LR, CR etc. */ while (stack <= frame && frame < stackend) { if (obj + len <= frame) return obj >= params ? GOOD_FRAME : BAD_STACK; params = frame + STACK_FRAME_PARAMS; frame = *(const void * const *)frame; } return BAD_STACK; } #ifdef CONFIG_PPC32 extern void *emergency_ctx[]; #endif #endif /* !__ASSEMBLER__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_THREAD_INFO_H */
