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Diffstat (limited to 'arch/powerpc/include/asm/thread_info.h')
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h new file mode 100644 index 000000000..bf5dde1a4 --- /dev/null +++ b/arch/powerpc/include/asm/thread_info.h @@ -0,0 +1,233 @@ +/* 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__ + +#ifdef CONFIG_KASAN +#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 __ASSEMBLY__ +#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 /* __ASSEMBLY__ */ + +/* + * 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_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_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_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_LAZY_MMU 3 /* tlb_batch is active */ +#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ + +#define _TLF_NAPPING (1 << TLF_NAPPING) +#define _TLF_SLEEPING (1 << TLF_SLEEPING) +#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) +#define _TLF_RUNLATCH (1 << TLF_RUNLATCH) + +#ifndef __ASSEMBLY__ + +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; +} + +#endif /* !__ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_POWERPC_THREAD_INFO_H */ |