1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* thread_info.h: PowerPC low-level thread information 3 * adapted from the i386 version by Paul Mackerras 4 * 5 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 6 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 7 */ 8 9 #ifndef _ASM_POWERPC_THREAD_INFO_H 10 #define _ASM_POWERPC_THREAD_INFO_H 11 12 #include <asm/asm-const.h> 13 #include <asm/page.h> 14 15 #ifdef __KERNEL__ 16 17 #ifdef CONFIG_KASAN 18 #define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1) 19 #else 20 #define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT 21 #endif 22 23 #if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT 24 #define THREAD_SHIFT PAGE_SHIFT 25 #else 26 #define THREAD_SHIFT MIN_THREAD_SHIFT 27 #endif 28 29 #define THREAD_SIZE (1 << THREAD_SHIFT) 30 31 /* 32 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by 33 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry 34 * assembly. 35 */ 36 #ifdef CONFIG_VMAP_STACK 37 #define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1) 38 #else 39 #define THREAD_ALIGN_SHIFT THREAD_SHIFT 40 #endif 41 42 #define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT) 43 44 #ifndef __ASSEMBLY__ 45 #include <linux/cache.h> 46 #include <asm/processor.h> 47 #include <asm/accounting.h> 48 49 #define SLB_PRELOAD_NR 16U 50 /* 51 * low level task data. 52 */ 53 struct thread_info { 54 int preempt_count; /* 0 => preemptable, 55 <0 => BUG */ 56 unsigned long local_flags; /* private flags for thread */ 57 #ifdef CONFIG_LIVEPATCH 58 unsigned long *livepatch_sp; 59 #endif 60 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 61 struct cpu_accounting_data accounting; 62 #endif 63 unsigned char slb_preload_nr; 64 unsigned char slb_preload_tail; 65 u32 slb_preload_esid[SLB_PRELOAD_NR]; 66 67 /* low level flags - has atomic operations done on it */ 68 unsigned long flags ____cacheline_aligned_in_smp; 69 }; 70 71 /* 72 * macros/functions for gaining access to the thread information structure 73 */ 74 #define INIT_THREAD_INFO(tsk) \ 75 { \ 76 .preempt_count = INIT_PREEMPT_COUNT, \ 77 .flags = 0, \ 78 } 79 80 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 81 82 /* how to get the thread information struct from C */ 83 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 84 85 void arch_setup_new_exec(void); 86 #define arch_setup_new_exec arch_setup_new_exec 87 88 #endif /* __ASSEMBLY__ */ 89 90 /* 91 * thread information flag bit numbers 92 */ 93 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 94 #define TIF_SIGPENDING 1 /* signal pending */ 95 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 96 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */ 97 #define TIF_SYSCALL_EMU 4 /* syscall emulation active */ 98 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 99 #define TIF_PATCH_PENDING 6 /* pending live patching update */ 100 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 101 #define TIF_SINGLESTEP 8 /* singlestepping active */ 102 #define TIF_SECCOMP 10 /* secure computing */ 103 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 104 #define TIF_NOERROR 12 /* Force successful syscall return */ 105 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 106 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 107 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 108 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 109 for stack store? */ 110 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 111 #if defined(CONFIG_PPC64) 112 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 113 #endif 114 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 115 #define TIF_32BIT 20 /* 32 bit binary */ 116 117 /* as above, but as bit values */ 118 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 119 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 120 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 121 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 122 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 123 #define _TIF_32BIT (1<<TIF_32BIT) 124 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 125 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 126 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 127 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 128 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 129 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 130 #define _TIF_NOERROR (1<<TIF_NOERROR) 131 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 132 #define _TIF_UPROBE (1<<TIF_UPROBE) 133 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 134 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 135 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) 136 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 137 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 138 _TIF_SYSCALL_EMU) 139 140 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 141 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 142 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \ 143 _TIF_NOTIFY_SIGNAL) 144 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 145 146 /* Bits in local_flags */ 147 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 148 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 149 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 150 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 151 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 152 153 #define _TLF_NAPPING (1 << TLF_NAPPING) 154 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 155 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 156 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 157 158 #ifndef __ASSEMBLY__ 159 clear_thread_local_flags(unsigned int flags)160static inline void clear_thread_local_flags(unsigned int flags) 161 { 162 struct thread_info *ti = current_thread_info(); 163 ti->local_flags &= ~flags; 164 } 165 test_thread_local_flags(unsigned int flags)166static inline bool test_thread_local_flags(unsigned int flags) 167 { 168 struct thread_info *ti = current_thread_info(); 169 return (ti->local_flags & flags) != 0; 170 } 171 172 #ifdef CONFIG_COMPAT 173 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 174 #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) 175 #else 176 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) 177 #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) 178 #endif 179 180 #if defined(CONFIG_PPC64) 181 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 182 #else 183 #define is_elf2_task() (0) 184 #endif 185 186 #endif /* !__ASSEMBLY__ */ 187 188 #endif /* __KERNEL__ */ 189 190 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 191