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 #ifdef CONFIG_SMP 57 unsigned int cpu; 58 #endif 59 unsigned long local_flags; /* private flags for thread */ 60 #ifdef CONFIG_LIVEPATCH_64 61 unsigned long *livepatch_sp; 62 #endif 63 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 64 struct cpu_accounting_data accounting; 65 #endif 66 unsigned char slb_preload_nr; 67 unsigned char slb_preload_tail; 68 u32 slb_preload_esid[SLB_PRELOAD_NR]; 69 70 /* low level flags - has atomic operations done on it */ 71 unsigned long flags ____cacheline_aligned_in_smp; 72 }; 73 74 /* 75 * macros/functions for gaining access to the thread information structure 76 */ 77 #define INIT_THREAD_INFO(tsk) \ 78 { \ 79 .preempt_count = INIT_PREEMPT_COUNT, \ 80 .flags = 0, \ 81 } 82 83 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 84 85 /* how to get the thread information struct from C */ 86 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 87 88 void arch_setup_new_exec(void); 89 #define arch_setup_new_exec arch_setup_new_exec 90 91 #endif /* __ASSEMBLY__ */ 92 93 /* 94 * thread information flag bit numbers 95 */ 96 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 97 #define TIF_SIGPENDING 1 /* signal pending */ 98 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 99 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */ 100 #define TIF_SYSCALL_EMU 4 /* syscall emulation active */ 101 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 102 #define TIF_PATCH_PENDING 6 /* pending live patching update */ 103 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 104 #define TIF_SINGLESTEP 8 /* singlestepping active */ 105 #define TIF_SECCOMP 10 /* secure computing */ 106 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 107 #define TIF_NOERROR 12 /* Force successful syscall return */ 108 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 109 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 110 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 111 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 112 for stack store? */ 113 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 114 #if defined(CONFIG_PPC64) 115 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 116 #endif 117 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 118 #define TIF_32BIT 20 /* 32 bit binary */ 119 120 /* as above, but as bit values */ 121 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 122 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 123 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 124 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 125 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 126 #define _TIF_32BIT (1<<TIF_32BIT) 127 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 128 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 129 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 130 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 131 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 132 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 133 #define _TIF_NOERROR (1<<TIF_NOERROR) 134 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 135 #define _TIF_UPROBE (1<<TIF_UPROBE) 136 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 137 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 138 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) 139 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 140 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 141 _TIF_SYSCALL_EMU) 142 143 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 144 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 145 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \ 146 _TIF_NOTIFY_SIGNAL) 147 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 148 149 /* Bits in local_flags */ 150 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 151 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 152 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 153 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 154 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 155 156 #define _TLF_NAPPING (1 << TLF_NAPPING) 157 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 158 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 159 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 160 161 #ifndef __ASSEMBLY__ 162 clear_thread_local_flags(unsigned int flags)163 static inline void clear_thread_local_flags(unsigned int flags) 164 { 165 struct thread_info *ti = current_thread_info(); 166 ti->local_flags &= ~flags; 167 } 168 test_thread_local_flags(unsigned int flags)169 static inline bool test_thread_local_flags(unsigned int flags) 170 { 171 struct thread_info *ti = current_thread_info(); 172 return (ti->local_flags & flags) != 0; 173 } 174 175 #ifdef CONFIG_COMPAT 176 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 177 #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) 178 #else 179 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) 180 #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) 181 #endif 182 183 #if defined(CONFIG_PPC64) 184 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 185 #else 186 #define is_elf2_task() (0) 187 #endif 188 189 #endif /* !__ASSEMBLY__ */ 190 191 #endif /* __KERNEL__ */ 192 193 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 194