/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _KSTACK_H #define _KSTACK_H #include <linux/thread_info.h> #include <linux/sched.h> #include <asm/ptrace.h> #include <asm/irq.h> /* 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 */