projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 60ffc30d CM |
1 | /* |
| 2 | * Copyright (C) 2012 ARM Ltd. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, | |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 | * GNU General Public License for more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public License | |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 15 | */ | |
| 16 | #ifndef __ASM_STACKTRACE_H | |
| 17 | #define __ASM_STACKTRACE_H | |
| 18 | ||
| f60ad4ed MR |
19 | #include <linux/percpu.h> |
| 20 | #include <linux/sched.h> | |
| 21 | #include <linux/sched/task_stack.h> | |
| 22 | ||
| 23 | #include <asm/memory.h> | |
| 24 | #include <asm/ptrace.h> | |
| fe13f95b | 25 | |
| 60ffc30d CM |
26 | struct stackframe { |
| 27 | unsigned long fp; | |
| 60ffc30d | 28 | unsigned long pc; |
| 20380bb3 AT |
29 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 30 | unsigned int graph; | |
| 31 | #endif | |
| 60ffc30d CM |
32 | }; |
| 33 | ||
| fe13f95b AT |
34 | extern int unwind_frame(struct task_struct *tsk, struct stackframe *frame); |
| 35 | extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame, | |
| 60ffc30d | 36 | int (*fn)(struct stackframe *, void *), void *data); |
| 1149aad1 | 37 | extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk); |
| 60ffc30d | 38 | |
| f60fe78f | 39 | DECLARE_PER_CPU(unsigned long *, irq_stack_ptr); |
| f60ad4ed MR |
40 | |
| 41 | static inline bool on_irq_stack(unsigned long sp) | |
| 42 | { | |
| f60fe78f | 43 | unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr); |
| f60ad4ed MR |
44 | unsigned long high = low + IRQ_STACK_SIZE; |
| 45 | ||
| f60fe78f MR |
46 | if (!low) |
| 47 | return false; | |
| 48 | ||
| f60ad4ed MR |
49 | return (low <= sp && sp < high); |
| 50 | } | |
| 51 | ||
| 52 | static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp) | |
| 53 | { | |
| 54 | unsigned long low = (unsigned long)task_stack_page(tsk); | |
| 55 | unsigned long high = low + THREAD_SIZE; | |
| 56 | ||
| 57 | return (low <= sp && sp < high); | |
| 58 | } | |
| 59 | ||
| 872d8327 MR |
60 | #ifdef CONFIG_VMAP_STACK |
| 61 | DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack); | |
| 62 | ||
| 63 | static inline bool on_overflow_stack(unsigned long sp) | |
| 64 | { | |
| 65 | unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack); | |
| 66 | unsigned long high = low + OVERFLOW_STACK_SIZE; | |
| 67 | ||
| 68 | return (low <= sp && sp < high); | |
| 69 | } | |
| 70 | #else | |
| 71 | static inline bool on_overflow_stack(unsigned long sp) { return false; } | |
| 72 | #endif | |
| 73 | ||
| 12964443 MR |
74 | /* |
| 75 | * We can only safely access per-cpu stacks from current in a non-preemptible | |
| 76 | * context. | |
| 77 | */ | |
| 78 | static inline bool on_accessible_stack(struct task_struct *tsk, unsigned long sp) | |
| 79 | { | |
| 80 | if (on_task_stack(tsk, sp)) | |
| 81 | return true; | |
| 82 | if (tsk != current || preemptible()) | |
| 83 | return false; | |
| 84 | if (on_irq_stack(sp)) | |
| 85 | return true; | |
| 872d8327 MR |
86 | if (on_overflow_stack(sp)) |
| 87 | return true; | |
| 12964443 MR |
88 | |
| 89 | return false; | |
| 90 | } | |
| 91 | ||
| 60ffc30d | 92 | #endif /* __ASM_STACKTRACE_H */ |