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