/* SPDX-License-Identifier: GPL-2.0 */#ifndef _ASM_S390_STACKTRACE_H#define _ASM_S390_STACKTRACE_H #include <linux/stacktrace.h>#include <linux/uaccess.h>#include <linux/ptrace.h> struct stack_frame_user {	unsigned long back_chain;	unsigned long empty1[5];	unsigned long gprs[10];	unsigned long empty2[4];}; struct stack_frame_vdso_wrapper {	struct stack_frame_user sf;	unsigned long return_address;}; struct perf_callchain_entry_ctx; void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie,				 struct perf_callchain_entry_ctx *entry,				 const struct pt_regs *regs, bool perf); enum stack_type {	STACK_TYPE_UNKNOWN,	STACK_TYPE_TASK,	STACK_TYPE_IRQ,	STACK_TYPE_NODAT,	STACK_TYPE_RESTART,	STACK_TYPE_MCCK,}; 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;} /* * Stack layout of a C stack frame. * Kernel uses the packed stack layout (-mpacked-stack). */struct stack_frame {	union {		unsigned long empty[9];		struct {			unsigned long sie_control_block;			unsigned long sie_savearea;			unsigned long sie_return;			unsigned long sie_flags;			unsigned long sie_control_block_phys;			unsigned long sie_guest_asce;			unsigned long sie_irq;		};	};	unsigned long gprs[10];	unsigned long back_chain;}; /* * Unlike current_stack_pointer which simply contains the 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)) 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_frame_address();	return (unsigned long)task->thread.ksp;} /* * To keep this simple mark register 2-6 as being changed (volatile) * by the called function, even though register 6 is saved/nonvolatile. */#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_LARGS_0(...)						\	long dummy = 0#define CALL_LARGS_1(t1, a1)						\	long arg1  = (long)(t1)(a1)#define CALL_LARGS_2(t1, a1, t2, a2)					\	CALL_LARGS_1(t1, a1);						\	long arg2 = (long)(t2)(a2)#define CALL_LARGS_3(t1, a1, t2, a2, t3, a3)				\	CALL_LARGS_2(t1, a1, t2, a2);					\	long arg3 = (long)(t3)(a3)#define CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4)			\	CALL_LARGS_3(t1, a1, t2, a2, t3, a3);				\	long arg4  = (long)(t4)(a4)#define CALL_LARGS_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5)		\	CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4);			\	long arg5 = (long)(t5)(a5) #define CALL_REGS_0							\	register long r2 asm("2") = dummy#define CALL_REGS_1							\	register long r2 asm("2") = arg1#define CALL_REGS_2							\	CALL_REGS_1;							\	register long r3 asm("3") = arg2#define CALL_REGS_3							\	CALL_REGS_2;							\	register long r4 asm("4") = arg3#define CALL_REGS_4							\	CALL_REGS_3;							\	register long r5 asm("5") = arg4#define CALL_REGS_5							\	CALL_REGS_4;							\	register long r6 asm("6") = arg5 #define CALL_TYPECHECK_0(...)#define CALL_TYPECHECK_1(t, a, ...)					\	typecheck(t, a)#define CALL_TYPECHECK_2(t, a, ...)					\	CALL_TYPECHECK_1(__VA_ARGS__);					\	typecheck(t, a)#define CALL_TYPECHECK_3(t, a, ...)					\	CALL_TYPECHECK_2(__VA_ARGS__);					\	typecheck(t, a)#define CALL_TYPECHECK_4(t, a, ...)					\	CALL_TYPECHECK_3(__VA_ARGS__);					\	typecheck(t, a)#define CALL_TYPECHECK_5(t, a, ...)					\	CALL_TYPECHECK_4(__VA_ARGS__);					\	typecheck(t, a) #define CALL_PARM_0(...) void#define CALL_PARM_1(t, a, ...) t#define CALL_PARM_2(t, a, ...) t, CALL_PARM_1(__VA_ARGS__)#define CALL_PARM_3(t, a, ...) t, CALL_PARM_2(__VA_ARGS__)#define CALL_PARM_4(t, a, ...) t, CALL_PARM_3(__VA_ARGS__)#define CALL_PARM_5(t, a, ...) t, CALL_PARM_4(__VA_ARGS__)#define CALL_PARM_6(t, a, ...) t, CALL_PARM_5(__VA_ARGS__) /* * Use call_on_stack() to call a function switching to a specified * stack. Proper sign and zero extension of function arguments is * done. Usage: * * rc = call_on_stack(nr, stack, rettype, fn, t1, a1, t2, a2, ...) * * - nr specifies the number of function arguments of fn. * - stack specifies the stack to be used. * - fn is the function to be called. * - rettype is the return type of fn. * - t1, a1, ... are pairs, where t1 must match the type of the first *   argument of fn, t2 the second, etc. a1 is the corresponding *   first function argument (not name), etc. */#define call_on_stack(nr, stack, rettype, fn, ...)			\({									\	rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = fn;		\	unsigned long frame = current_frame_address();			\	unsigned long __stack = stack;					\	unsigned long prev;						\	CALL_LARGS_##nr(__VA_ARGS__);					\	CALL_REGS_##nr;							\									\	CALL_TYPECHECK_##nr(__VA_ARGS__);				\	asm volatile(							\		"	lgr	%[_prev],15\n"				\		"	lg	15,%[_stack]\n"				\		"	stg	%[_frame],%[_bc](15)\n"			\		"	brasl	14,%[_fn]\n"				\		"	lgr	15,%[_prev]"				\		: [_prev] "=&d" (prev), CALL_FMT_##nr			\		: [_stack] "R" (__stack),				\		  [_bc] "i" (offsetof(struct stack_frame, back_chain)),	\		  [_frame] "d" (frame),					\		  [_fn] "X" (__fn) : CALL_CLOBBER_##nr);		\	(rettype)r2;							\}) /* * Use call_nodat() to call a function with DAT disabled. * Proper sign and zero extension of function arguments is done. * Usage: * * rc = call_nodat(nr, rettype, fn, t1, a1, t2, a2, ...) * * - nr specifies the number of function arguments of fn. * - fn is the function to be called, where fn is a physical address. * - rettype is the return type of fn. * - t1, a1, ... are pairs, where t1 must match the type of the first *   argument of fn, t2 the second, etc. a1 is the corresponding *   first function argument (not name), etc. * * fn() is called with standard C function call ABI, with the exception * that no useful stackframe or stackpointer is passed via register 15. * Therefore the called function must not use r15 to access the stack. */#define call_nodat(nr, rettype, fn, ...)				\({									\	rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = (fn);		\	/* aligned since psw_leave must not cross page boundary */	\	psw_t __aligned(16) psw_leave;					\	psw_t psw_enter;						\	CALL_LARGS_##nr(__VA_ARGS__);					\	CALL_REGS_##nr;							\									\	CALL_TYPECHECK_##nr(__VA_ARGS__);				\	psw_enter.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;		\	psw_enter.addr = (unsigned long)__fn;				\	asm volatile(							\		"	epsw	0,1\n"					\		"	risbg	1,0,0,31,32\n"				\		"	larl	7,1f\n"					\		"	stg	1,%[psw_leave]\n"			\		"	stg	7,8+%[psw_leave]\n"			\		"	la	7,%[psw_leave]\n"			\		"	lra	7,0(7)\n"				\		"	larl	1,0f\n"					\		"	lra	14,0(1)\n"				\		"	lpswe	%[psw_enter]\n"				\		"0:	lpswe	0(7)\n"					\		"1:"							\		: CALL_FMT_##nr, [psw_leave] "=Q" (psw_leave)		\		: [psw_enter] "Q" (psw_enter)				\		: "7", CALL_CLOBBER_##nr);				\	(rettype)r2;							\}) #endif /* _ASM_S390_STACKTRACE_H */