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84 lines
2.2 KiB
84 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _KSTACK_H |
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#define _KSTACK_H |
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#include <linux/thread_info.h> |
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#include <linux/sched.h> |
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#include <asm/ptrace.h> |
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#include <asm/irq.h> |
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/* SP must be STACK_BIAS adjusted already. */ |
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static inline bool kstack_valid(struct thread_info *tp, unsigned long sp) |
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{ |
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unsigned long base = (unsigned long) tp; |
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/* Stack pointer must be 16-byte aligned. */ |
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if (sp & (16UL - 1)) |
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return false; |
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if (sp >= (base + sizeof(struct thread_info)) && |
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sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) |
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return true; |
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if (hardirq_stack[tp->cpu]) { |
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base = (unsigned long) hardirq_stack[tp->cpu]; |
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if (sp >= base && |
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sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) |
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return true; |
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base = (unsigned long) softirq_stack[tp->cpu]; |
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if (sp >= base && |
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sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf))) |
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return true; |
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} |
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return false; |
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} |
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/* Does "regs" point to a valid pt_regs trap frame? */ |
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static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs) |
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{ |
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unsigned long base = (unsigned long) tp; |
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unsigned long addr = (unsigned long) regs; |
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if (addr >= base && |
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addr <= (base + THREAD_SIZE - sizeof(*regs))) |
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goto check_magic; |
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if (hardirq_stack[tp->cpu]) { |
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base = (unsigned long) hardirq_stack[tp->cpu]; |
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if (addr >= base && |
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addr <= (base + THREAD_SIZE - sizeof(*regs))) |
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goto check_magic; |
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base = (unsigned long) softirq_stack[tp->cpu]; |
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if (addr >= base && |
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addr <= (base + THREAD_SIZE - sizeof(*regs))) |
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goto check_magic; |
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} |
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return false; |
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check_magic: |
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if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) |
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return true; |
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return false; |
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} |
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static inline __attribute__((always_inline)) void *set_hardirq_stack(void) |
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{ |
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void *orig_sp, *sp = hardirq_stack[smp_processor_id()]; |
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__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp)); |
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if (orig_sp < sp || |
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orig_sp > (sp + THREAD_SIZE)) { |
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sp += THREAD_SIZE - 192 - STACK_BIAS; |
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__asm__ __volatile__("mov %0, %%sp" : : "r" (sp)); |
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} |
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return orig_sp; |
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} |
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static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) |
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{ |
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__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); |
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} |
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#endif /* _KSTACK_H */
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