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 __ASSEMBLER__ 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 exit_flags; /* Exit Flags for entry/exit */ 61 unsigned long syscall_work; /* SYSCALL_WORK_ flags */ 62 unsigned long local_flags; /* private flags for thread */ 63 #ifdef CONFIG_LIVEPATCH_64 64 unsigned long *livepatch_sp; 65 #endif 66 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 67 struct cpu_accounting_data accounting; 68 #endif 69 unsigned char slb_preload_nr; 70 unsigned char slb_preload_tail; 71 u32 slb_preload_esid[SLB_PRELOAD_NR]; 72 73 /* low level flags - has atomic operations done on it */ 74 unsigned long flags ____cacheline_aligned_in_smp; 75 }; 76 77 /* 78 * macros/functions for gaining access to the thread information structure 79 */ 80 #define INIT_THREAD_INFO(tsk) \ 81 { \ 82 .preempt_count = INIT_PREEMPT_COUNT, \ 83 .flags = 0, \ 84 } 85 86 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 87 88 /* how to get the thread information struct from C */ 89 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 90 91 void arch_setup_new_exec(void); 92 #define arch_setup_new_exec arch_setup_new_exec 93 94 #endif /* __ASSEMBLER__ */ 95 96 /* 97 * thread information flag bit numbers 98 */ 99 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 100 #define TIF_SIGPENDING 1 /* signal pending */ 101 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 102 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */ 103 #define TIF_SYSCALL_EMU 4 /* syscall emulation active */ 104 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 105 #define TIF_PATCH_PENDING 6 /* pending live patching update */ 106 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 107 #define TIF_SINGLESTEP 8 /* singlestepping active */ 108 #define TIF_NEED_RESCHED_LAZY 9 /* Scheduler driven lazy preemption */ 109 #define TIF_SECCOMP 10 /* secure computing */ 110 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 111 #define TIF_NOERROR 12 /* Force successful syscall return */ 112 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 113 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 114 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 115 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 116 for stack store? */ 117 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 118 #if defined(CONFIG_PPC64) 119 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 120 #endif 121 #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 122 #define TIF_32BIT 20 /* 32 bit binary */ 123 124 /* as above, but as bit values */ 125 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 126 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 127 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 128 #define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY) 129 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) 130 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 131 #define _TIF_32BIT (1<<TIF_32BIT) 132 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 133 #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) 134 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 135 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 136 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 137 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 138 #define _TIF_NOERROR (1<<TIF_NOERROR) 139 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 140 #define _TIF_UPROBE (1<<TIF_UPROBE) 141 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 142 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 143 #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) 144 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 145 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 146 _TIF_SYSCALL_EMU) 147 148 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 149 _TIF_NEED_RESCHED_LAZY | _TIF_NOTIFY_RESUME | \ 150 _TIF_UPROBE | _TIF_RESTORE_TM | \ 151 _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL) 152 153 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 154 155 /* Bits in local_flags */ 156 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 157 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 158 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 159 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 160 161 #define _TLF_NAPPING (1 << TLF_NAPPING) 162 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 163 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 164 165 #ifndef __ASSEMBLER__ 166 167 static inline void clear_thread_local_flags(unsigned int flags) 168 { 169 struct thread_info *ti = current_thread_info(); 170 ti->local_flags &= ~flags; 171 } 172 173 static inline bool test_thread_local_flags(unsigned int flags) 174 { 175 struct thread_info *ti = current_thread_info(); 176 return (ti->local_flags & flags) != 0; 177 } 178 179 #ifdef CONFIG_COMPAT 180 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 181 #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT)) 182 #define clear_tsk_compat_task(tsk) (clear_tsk_thread_flag(p, TIF_32BIT)) 183 #else 184 #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32)) 185 #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32)) 186 #define clear_tsk_compat_task(tsk) do { } while (0) 187 #endif 188 189 #if defined(CONFIG_PPC64) 190 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 191 #else 192 #define is_elf2_task() (0) 193 #endif 194 195 /* 196 * Walks up the stack frames to make sure that the specified object is 197 * entirely contained by a single stack frame. 198 * 199 * Returns: 200 * GOOD_FRAME if within a frame 201 * BAD_STACK if placed across a frame boundary (or outside stack) 202 */ 203 static inline int arch_within_stack_frames(const void * const stack, 204 const void * const stackend, 205 const void *obj, unsigned long len) 206 { 207 const void *params; 208 const void *frame; 209 210 params = *(const void * const *)current_stack_pointer + STACK_FRAME_PARAMS; 211 frame = **(const void * const * const *)current_stack_pointer; 212 213 /* 214 * low -----------------------------------------------------------> high 215 * [backchain][metadata][params][local vars][saved registers][backchain] 216 * ^------------------------------------^ 217 * | allows copies only in this region | 218 * | | 219 * params frame 220 * The metadata region contains the saved LR, CR etc. 221 */ 222 while (stack <= frame && frame < stackend) { 223 if (obj + len <= frame) 224 return obj >= params ? GOOD_FRAME : BAD_STACK; 225 params = frame + STACK_FRAME_PARAMS; 226 frame = *(const void * const *)frame; 227 } 228 229 return BAD_STACK; 230 } 231 232 #ifdef CONFIG_PPC32 233 extern void *emergency_ctx[]; 234 #endif 235 236 #endif /* !__ASSEMBLER__ */ 237 238 #endif /* __KERNEL__ */ 239 240 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 241