xref: /openbmc/linux/arch/sparc/include/asm/asmmacro.h (revision b2441318)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* asmmacro.h: Assembler macros.
3  *
4  * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
5  */
6 
7 #ifndef _SPARC_ASMMACRO_H
8 #define _SPARC_ASMMACRO_H
9 
10 /* All trap entry points _must_ begin with this macro or else you
11  * lose.  It makes sure the kernel has a proper window so that
12  * c-code can be called.
13  */
14 #define SAVE_ALL_HEAD \
15 	sethi	%hi(trap_setup), %l4; \
16 	jmpl	%l4 + %lo(trap_setup), %l6;
17 #define SAVE_ALL \
18 	SAVE_ALL_HEAD \
19 	 nop;
20 
21 /* All traps low-level code here must end with this macro. */
22 #define RESTORE_ALL b ret_trap_entry; clr %l6;
23 
24 /* Support for run-time patching of single instructions.
25  * This is used to handle the differences in the ASI for
26  * MMUREGS for LEON and SUN.
27  *
28  * Sample:
29  * LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0
30  * SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0
31  * PI == Patch Instruction
32  *
33  * For LEON we will use the first variant,
34  * and for all other we will use the SUN variant.
35  * The order is important.
36  */
37 #define LEON_PI(...)				\
38 662:	__VA_ARGS__
39 
40 #define SUN_PI_(...)				\
41 	.section .leon_1insn_patch, "ax";	\
42 	.word 662b;				\
43 	__VA_ARGS__;				\
44 	.previous
45 
46 #endif /* !(_SPARC_ASMMACRO_H) */
47