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| 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 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 /* __ASSEMBLER__ */ |
| 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_NEED_RESCHED_LAZY 9 /* Scheduler driven lazy preemption */ |
| 107 | #define TIF_SECCOMP 10 /* secure computing */ |
| 108 | #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ |
| 109 | #define TIF_NOERROR 12 /* Force successful syscall return */ |
| 110 | #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ |
| 111 | #define TIF_UPROBE 14 /* breakpointed or single-stepping */ |
| 112 | #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ |
| 113 | #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation |
| 114 | for stack store? */ |
| 115 | #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ |
| 116 | #if defined(CONFIG_PPC64) |
| 117 | #define TIF_ELF2ABI 18 /* function descriptors must die! */ |
| 118 | #endif |
| 119 | #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
| 120 | #define TIF_32BIT 20 /* 32 bit binary */ |
| 121 | |
| 122 | /* as above, but as bit values */ |
| 123 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 124 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 125 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 126 | #define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY) |
| 127 | #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
| 128 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 129 | #define _TIF_32BIT (1<<TIF_32BIT) |
| 130 | #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) |
| 131 | #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) |
| 132 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| 133 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) |
| 134 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
| 135 | #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) |
| 136 | #define _TIF_NOERROR (1<<TIF_NOERROR) |
| 137 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 138 | #define _TIF_UPROBE (1<<TIF_UPROBE) |
| 139 | #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
| 140 | #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) |
| 141 | #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU) |
| 142 | #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ |
| 143 | _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ |
| 144 | _TIF_SYSCALL_EMU) |
| 145 | |
| 146 | #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ |
| 147 | _TIF_NEED_RESCHED_LAZY | _TIF_NOTIFY_RESUME | \ |
| 148 | _TIF_UPROBE | _TIF_RESTORE_TM | \ |
| 149 | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL) |
| 150 | |
| 151 | #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) |
| 152 | |
| 153 | /* Bits in local_flags */ |
| 154 | /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ |
| 155 | #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ |
| 156 | #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ |
| 157 | #define TLF_LAZY_MMU 3 /* tlb_batch is active */ |
| 158 | #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ |
| 159 | |
| 160 | #define _TLF_NAPPING (1 << TLF_NAPPING) |
| 161 | #define _TLF_SLEEPING (1 << TLF_SLEEPING) |
| 162 | #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) |
| 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 |
Warning: This file is not a C or C++ file. It does not have highlighting.