projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4f70f7a9 DM |
1 | #ifndef _KSTACK_H |
| 2 | #define _KSTACK_H | |
| 3 | ||
| 4 | #include <linux/thread_info.h> | |
| 5 | #include <linux/sched.h> | |
| 6 | #include <asm/ptrace.h> | |
| 7 | #include <asm/irq.h> | |
| 8 | ||
| 9 | /* SP must be STACK_BIAS adjusted already. */ | |
| 10 | static inline bool kstack_valid(struct thread_info *tp, unsigned long sp) | |
| 11 | { | |
| 12 | unsigned long base = (unsigned long) tp; | |
| 13 | ||
| 232486e1 DM |
14 | /* Stack pointer must be 16-byte aligned. */ |
| 15 | if (sp & (16UL - 1)) | |
| 16 | return false; | |
| 17 | ||
| 4f70f7a9 DM |
18 | if (sp >= (base + sizeof(struct thread_info)) && |
| 19 | sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) | |
| 20 | return true; | |
| 21 | ||
| 6f63e781 DM |
22 | if (hardirq_stack[tp->cpu]) { |
| 23 | base = (unsigned long) hardirq_stack[tp->cpu]; | |
| 24 | if (sp >= base && | |
| 25 | sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) | |
| 26 | return true; | |
| 27 | base = (unsigned long) softirq_stack[tp->cpu]; | |
| 28 | if (sp >= base && | |
| 29 | sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) | |
| 30 | return true; | |
| 31 | } | |
| 4f70f7a9 DM |
32 | return false; |
| 33 | } | |
| 34 | ||
| 35 | /* Does "regs" point to a valid pt_regs trap frame? */ | |
| 36 | static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs) | |
| 37 | { | |
| 38 | unsigned long base = (unsigned long) tp; | |
| 39 | unsigned long addr = (unsigned long) regs; | |
| 40 | ||
| 41 | if (addr >= base && | |
| 42 | addr <= (base + THREAD_SIZE - sizeof(*regs))) | |
| 43 | goto check_magic; | |
| 44 | ||
| 6f63e781 DM |
45 | if (hardirq_stack[tp->cpu]) { |
| 46 | base = (unsigned long) hardirq_stack[tp->cpu]; | |
| 47 | if (addr >= base && | |
| 48 | addr <= (base + THREAD_SIZE - sizeof(*regs))) | |
| 49 | goto check_magic; | |
| 50 | base = (unsigned long) softirq_stack[tp->cpu]; | |
| 51 | if (addr >= base && | |
| 52 | addr <= (base + THREAD_SIZE - sizeof(*regs))) | |
| 53 | goto check_magic; | |
| 54 | } | |
| 4f70f7a9 DM |
55 | return false; |
| 56 | ||
| 57 | check_magic: | |
| 58 | if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) | |
| 59 | return true; | |
| 60 | return false; | |
| 61 | ||
| 62 | } | |
| 63 | ||
| ec687886 DM |
64 | static inline __attribute__((always_inline)) void *set_hardirq_stack(void) |
| 65 | { | |
| 66 | void *orig_sp, *sp = hardirq_stack[smp_processor_id()]; | |
| 67 | ||
| 68 | __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp)); | |
| 69 | if (orig_sp < sp || | |
| 70 | orig_sp > (sp + THREAD_SIZE)) { | |
| 71 | sp += THREAD_SIZE - 192 - STACK_BIAS; | |
| 72 | __asm__ __volatile__("mov %0, %%sp" : : "r" (sp)); | |
| 73 | } | |
| 74 | ||
| 75 | return orig_sp; | |
| 76 | } | |
| 77 | ||
| 78 | static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) | |
| 79 | { | |
| 80 | __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); | |
| 81 | } | |
| 82 | ||
| 4f70f7a9 | 83 | #endif /* _KSTACK_H */ |