/* SPDX-License-Identifier: GPL-2.0 */#ifndef _ASM_S390_STACKTRACE_H#define _ASM_S390_STACKTRACE_H #include <linux/uaccess.h>#include <linux/ptrace.h>#include <asm/switch_to.h> enum stack_type {	STACK_TYPE_UNKNOWN,	STACK_TYPE_TASK,	STACK_TYPE_IRQ,	STACK_TYPE_NODAT,	STACK_TYPE_RESTART,}; struct stack_info {	enum stack_type type;	unsigned long begin, end;}; const char *stack_type_name(enum stack_type type);int get_stack_info(unsigned long sp, struct task_struct *task,		   struct stack_info *info, unsigned long *visit_mask); static inline bool on_stack(struct stack_info *info,			    unsigned long addr, size_t len){	if (info->type == STACK_TYPE_UNKNOWN)		return false;	if (addr + len < addr)		return false;	return addr >= info->begin && addr + len <= info->end;} static __always_inline unsigned long get_stack_pointer(struct task_struct *task,						       struct pt_regs *regs){	if (regs)		return (unsigned long) kernel_stack_pointer(regs);	if (task == current)		return current_stack_pointer();	return (unsigned long) task->thread.ksp;} /* * Stack layout of a C stack frame. */#ifndef __PACK_STACKstruct stack_frame {	unsigned long back_chain;	unsigned long empty1[5];	unsigned long gprs[10];	unsigned int  empty2[8];};#elsestruct stack_frame {	unsigned long empty1[5];	unsigned int  empty2[8];	unsigned long gprs[10];	unsigned long back_chain;};#endif /* * Unlike current_stack_pointer() which simply returns current value of %r15 * current_frame_address() returns function stack frame address, which matches * %r15 upon function invocation. It may differ from %r15 later if function * allocates stack for local variables or new stack frame to call other * functions. */#define current_frame_address()						\	((unsigned long)__builtin_frame_address(0) -			\	 offsetof(struct stack_frame, back_chain)) #define CALL_ARGS_0()							\	register unsigned long r2 asm("2")#define CALL_ARGS_1(arg1)						\	register unsigned long r2 asm("2") = (unsigned long)(arg1)#define CALL_ARGS_2(arg1, arg2)						\	CALL_ARGS_1(arg1);						\	register unsigned long r3 asm("3") = (unsigned long)(arg2)#define CALL_ARGS_3(arg1, arg2, arg3)					\	CALL_ARGS_2(arg1, arg2);					\	register unsigned long r4 asm("4") = (unsigned long)(arg3)#define CALL_ARGS_4(arg1, arg2, arg3, arg4)				\	CALL_ARGS_3(arg1, arg2, arg3);					\	register unsigned long r4 asm("5") = (unsigned long)(arg4)#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5)			\	CALL_ARGS_4(arg1, arg2, arg3, arg4);				\	register unsigned long r4 asm("6") = (unsigned long)(arg5) #define CALL_FMT_0 "=&d" (r2) :#define CALL_FMT_1 "+&d" (r2) :#define CALL_FMT_2 CALL_FMT_1 "d" (r3),#define CALL_FMT_3 CALL_FMT_2 "d" (r4),#define CALL_FMT_4 CALL_FMT_3 "d" (r5),#define CALL_FMT_5 CALL_FMT_4 "d" (r6), #define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"#define CALL_CLOBBER_4 CALL_CLOBBER_5#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"#define CALL_CLOBBER_0 CALL_CLOBBER_1 #define CALL_ON_STACK(fn, stack, nr, args...)				\({									\	unsigned long frame = current_frame_address();			\	CALL_ARGS_##nr(args);						\	unsigned long prev;						\									\	asm volatile(							\		"	la	%[_prev],0(15)\n"			\		"	lg	15,%[_stack]\n"				\		"	stg	%[_frame],%[_bc](15)\n"			\		"	brasl	14,%[_fn]\n"				\		"	la	15,0(%[_prev])\n"			\		: [_prev] "=&a" (prev), CALL_FMT_##nr			\		  [_stack] "R" (stack),					\		  [_bc] "i" (offsetof(struct stack_frame, back_chain)),	\		  [_frame] "d" (frame),					\		  [_fn] "X" (fn) : CALL_CLOBBER_##nr);			\	r2;								\}) #define CALL_ON_STACK_NORETURN(fn, stack)				\({									\	asm volatile(							\		"	la	15,0(%[_stack])\n"			\		"	xc	%[_bc](8,15),%[_bc](15)\n"		\		"	brasl	14,%[_fn]\n"				\		::[_bc] "i" (offsetof(struct stack_frame, back_chain)),	\		  [_stack] "a" (stack), [_fn] "X" (fn));		\	BUG();								\}) #endif /* _ASM_S390_STACKTRACE_H */