From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/sparc/kernel/kstack.h | 83 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 arch/sparc/kernel/kstack.h (limited to 'arch/sparc/kernel/kstack.h') diff --git a/arch/sparc/kernel/kstack.h b/arch/sparc/kernel/kstack.h new file mode 100644 index 00000000..53dfb92e --- /dev/null +++ b/arch/sparc/kernel/kstack.h @@ -0,0 +1,83 @@ +#ifndef _KSTACK_H +#define _KSTACK_H + +#include +#include +#include +#include + +/* SP must be STACK_BIAS adjusted already. */ +static inline bool kstack_valid(struct thread_info *tp, unsigned long sp) +{ + unsigned long base = (unsigned long) tp; + + /* Stack pointer must be 16-byte aligned. */ + if (sp & (16UL - 1)) + return false; + + if (sp >= (base + sizeof(struct thread_info)) && + sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) + return true; + + if (hardirq_stack[tp->cpu]) { + base = (unsigned long) hardirq_stack[tp->cpu]; + if (sp >= base && + sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) + return true; + base = (unsigned long) softirq_stack[tp->cpu]; + if (sp >= base && + sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) + return true; + } + return false; +} + +/* Does "regs" point to a valid pt_regs trap frame? */ +static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs) +{ + unsigned long base = (unsigned long) tp; + unsigned long addr = (unsigned long) regs; + + if (addr >= base && + addr <= (base + THREAD_SIZE - sizeof(*regs))) + goto check_magic; + + if (hardirq_stack[tp->cpu]) { + base = (unsigned long) hardirq_stack[tp->cpu]; + if (addr >= base && + addr <= (base + THREAD_SIZE - sizeof(*regs))) + goto check_magic; + base = (unsigned long) softirq_stack[tp->cpu]; + if (addr >= base && + addr <= (base + THREAD_SIZE - sizeof(*regs))) + goto check_magic; + } + return false; + +check_magic: + if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) + return true; + return false; + +} + +static inline __attribute__((always_inline)) void *set_hardirq_stack(void) +{ + void *orig_sp, *sp = hardirq_stack[smp_processor_id()]; + + __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp)); + if (orig_sp < sp || + orig_sp > (sp + THREAD_SIZE)) { + sp += THREAD_SIZE - 192 - STACK_BIAS; + __asm__ __volatile__("mov %0, %%sp" : : "r" (sp)); + } + + return orig_sp; +} + +static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) +{ + __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); +} + +#endif /* _KSTACK_H */ -- cgit v1.3.1