Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef __S390_EXTABLE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __S390_EXTABLE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * The exception table consists of three addresses:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * - Address of an instruction that is allowed to fault.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * - Address at which the program should continue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * - Optional address of handler that takes pt_regs * argument and runs in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *   interrupt context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * No registers are modified, so it is entirely up to the continuation code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * to figure out what to do.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * All the routines below use bits of fixup code that are out of line
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * with the main instruction path.  This means when everything is well,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * we don't even have to jump over them.  Further, they do not intrude
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * on our cache or tlb entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct exception_table_entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	int insn, fixup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	long handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) extern struct exception_table_entry *__start_dma_ex_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) extern struct exception_table_entry *__stop_dma_ex_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) const struct exception_table_entry *s390_search_extables(unsigned long addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static inline unsigned long extable_fixup(const struct exception_table_entry *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return (unsigned long)&x->fixup + x->fixup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) typedef bool (*ex_handler_t)(const struct exception_table_entry *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			     struct pt_regs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static inline ex_handler_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) ex_fixup_handler(const struct exception_table_entry *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	if (likely(!x->handler))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return (ex_handler_t)((unsigned long)&x->handler + x->handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static inline bool ex_handle(const struct exception_table_entry *x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			     struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	ex_handler_t handler = ex_fixup_handler(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	if (unlikely(handler))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		return handler(x, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	regs->psw.addr = extable_fixup(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #define ARCH_HAS_RELATIVE_EXTABLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static inline void swap_ex_entry_fixup(struct exception_table_entry *a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 				       struct exception_table_entry *b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 				       struct exception_table_entry tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 				       int delta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	a->fixup = b->fixup + delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	b->fixup = tmp.fixup - delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	a->handler = b->handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	if (a->handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 		a->handler += delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	b->handler = tmp.handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	if (b->handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		b->handler -= delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #define swap_ex_entry_fixup swap_ex_entry_fixup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif