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_KASAN) && CONFIG_THREAD_SHIFT < 15 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 #include <asm/ppc_asm.h> 49 50 #define SLB_PRELOAD_NR 16U 51 /* 52 * low level task data. 53 */ 54 struct thread_info { 55 int preempt_count; /* 0 => preemptable, 56 <0 => BUG */ 57 #ifdef CONFIG_SMP 58 unsigned int cpu; 59 #endif 60 unsigned long local_flags; /* private flags for thread */ 61 #ifdef CONFIG_LIVEPATCH_64 62 unsigned long *livepatch_sp; 63 #endif 64 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 65 struct cpu_accounting_data accounting; 66 #endif 67 unsigned char slb_preload_nr; 68 unsigned char slb_preload_tail; 69 u32 slb_preload_esid[SLB_PRELOAD_NR]; 70 71 /* low level flags - has atomic operations done on it */ 72 unsigned long flags ____cacheline_aligned_in_smp; 73 }; 74 75 /* 76 * macros/functions for gaining access to the thread information structure 77 */ 78 #define INIT_THREAD_INFO(tsk) \ 79 { \ 80 .preempt_count = INIT_PREEMPT_COUNT, \ 81 .flags = 0, \ 82 } 83 84 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 85 86 /* how to get the thread information struct from C */ 87 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 88 89 void arch_setup_new_exec(void); 90 #define arch_setup_new_exec arch_setup_new_exec 91 92 #endif /* __ASSEMBLY__ */ 93 94 /* 95 * thread information flag bit numbers 96 */ 97 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 98 #define TIF_SIGPENDING 1 /* signal pending */ 99 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 100 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */ 101 #define TIF_SYSCALL_EMU 4 /* syscall emulation active */ 102 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 103 #define TIF_PATCH_PENDING 6 /* pending live patching update */ 104 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 105 #define TIF_SINGLESTEP 8 /* singlestepping active */ 106 #define TIF_SECCOMP 10 /* secure computing */ 107 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 108 #define TIF_NOERROR 12 /* Force successful syscall return */ 109 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 110 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 111 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 112 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 113 for stack store? */ 114 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 115 #if defined(CONFIG_PPC64) 116 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 117 #endif 118 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 119 #define TIF_32BIT 20 /* 32 bit binary */ 120 121 /* as above, but as bit values */ 122 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 123 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 124 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 125 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 126 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 127 #define _TIF_32BIT (1<<TIF_32BIT) 128 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 129 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 130 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 131 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 132 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 133 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 134 #define _TIF_NOERROR (1<<TIF_NOERROR) 135 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 136 #define _TIF_UPROBE (1<<TIF_UPROBE) 137 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 138 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 139 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) 140 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 141 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 142 _TIF_SYSCALL_EMU) 143 144 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 145 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 146 _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \ 147 _TIF_NOTIFY_SIGNAL) 148 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 149 150 /* Bits in local_flags */ 151 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 152 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 153 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 154 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 155 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 156 157 #define _TLF_NAPPING (1 << TLF_NAPPING) 158 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 159 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 160 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 161 162 #ifndef __ASSEMBLY__ 163 164 static inline void clear_thread_local_flags(unsigned int flags) 165 { 166 struct thread_info *ti = current_thread_info(); 167 ti->local_flags &= ~flags; 168 } 169 170 static inline bool test_thread_local_flags(unsigned int flags) 171 { 172 struct thread_info *ti = current_thread_info(); 173 return (ti->local_flags & flags) != 0; 174 } 175 176 #ifdef CONFIG_COMPAT 177 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 178 #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) 179 #define clear_tsk_compat_task(tsk) (clear_tsk_thread_flag(p, TIF_32BIT)) 180 #else 181 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) 182 #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) 183 #define clear_tsk_compat_task(tsk) do { } while (0) 184 #endif 185 186 #if defined(CONFIG_PPC64) 187 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 188 #else 189 #define is_elf2_task() (0) 190 #endif 191 192 /* 193 * Walks up the stack frames to make sure that the specified object is 194 * entirely contained by a single stack frame. 195 * 196 * Returns: 197 * GOOD_FRAME if within a frame 198 * BAD_STACK if placed across a frame boundary (or outside stack) 199 */ 200 static inline int arch_within_stack_frames(const void * const stack, 201 const void * const stackend, 202 const void *obj, unsigned long len) 203 { 204 const void *params; 205 const void *frame; 206 207 params = *(const void * const *)current_stack_pointer + STACK_FRAME_PARAMS; 208 frame = **(const void * const * const *)current_stack_pointer; 209 210 /* 211 * low -----------------------------------------------------------> high 212 * [backchain][metadata][params][local vars][saved registers][backchain] 213 * ^------------------------------------^ 214 * | allows copies only in this region | 215 * | | 216 * params frame 217 * The metadata region contains the saved LR, CR etc. 218 */ 219 while (stack <= frame && frame < stackend) { 220 if (obj + len <= frame) 221 return obj >= params ? GOOD_FRAME : BAD_STACK; 222 params = frame + STACK_FRAME_PARAMS; 223 frame = *(const void * const *)frame; 224 } 225 226 return BAD_STACK; 227 } 228 229 #endif /* !__ASSEMBLY__ */ 230 231 #endif /* __KERNEL__ */ 232 233 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 234