cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

alternative-macros.h (6046B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_ALTERNATIVE_MACROS_H
      3#define __ASM_ALTERNATIVE_MACROS_H
      4
      5#ifdef CONFIG_RISCV_ALTERNATIVE
      6
      7#ifdef __ASSEMBLY__
      8
      9.macro ALT_ENTRY oldptr newptr vendor_id errata_id new_len
     10	RISCV_PTR \oldptr
     11	RISCV_PTR \newptr
     12	REG_ASM \vendor_id
     13	REG_ASM \new_len
     14	.word	\errata_id
     15.endm
     16
     17.macro ALT_NEW_CONTENT vendor_id, errata_id, enable = 1, new_c : vararg
     18	.if \enable
     19	.pushsection .alternative, "a"
     20	ALT_ENTRY 886b, 888f, \vendor_id, \errata_id, 889f - 888f
     21	.popsection
     22	.subsection 1
     23888 :
     24	.option push
     25	.option norvc
     26	.option norelax
     27	\new_c
     28	.option pop
     29889 :
     30	.org    . - (889b - 888b) + (887b - 886b)
     31	.org    . - (887b - 886b) + (889b - 888b)
     32	.previous
     33	.endif
     34.endm
     35
     36.macro __ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, enable
     37886 :
     38	.option push
     39	.option norvc
     40	.option norelax
     41	\old_c
     42	.option pop
     43887 :
     44	ALT_NEW_CONTENT \vendor_id, \errata_id, \enable, \new_c
     45.endm
     46
     47#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
     48	__ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k)
     49
     50.macro __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
     51				  new_c_2, vendor_id_2, errata_id_2, enable_2
     52886 :
     53	.option push
     54	.option norvc
     55	.option norelax
     56	\old_c
     57	.option pop
     58887 :
     59	ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_1
     60	ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2
     61.endm
     62
     63#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
     64					CONFIG_k_1,			\
     65				  new_c_2, vendor_id_2, errata_id_2,	\
     66					CONFIG_k_2)			\
     67	__ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1,	\
     68					IS_ENABLED(CONFIG_k_1),		\
     69				   new_c_2, vendor_id_2, errata_id_2,	\
     70					IS_ENABLED(CONFIG_k_2)
     71
     72#else /* !__ASSEMBLY__ */
     73
     74#include <asm/asm.h>
     75#include <linux/stringify.h>
     76
     77#define ALT_ENTRY(oldptr, newptr, vendor_id, errata_id, newlen)		\
     78	RISCV_PTR " " oldptr "\n"					\
     79	RISCV_PTR " " newptr "\n"					\
     80	REG_ASM " " vendor_id "\n"					\
     81	REG_ASM " " newlen "\n"						\
     82	".word " errata_id "\n"
     83
     84#define ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c)		\
     85	".if " __stringify(enable) " == 1\n"				\
     86	".pushsection .alternative, \"a\"\n"				\
     87	ALT_ENTRY("886b", "888f", __stringify(vendor_id), __stringify(errata_id), "889f - 888f") \
     88	".popsection\n"							\
     89	".subsection 1\n"						\
     90	"888 :\n"							\
     91	".option push\n"						\
     92	".option norvc\n"						\
     93	".option norelax\n"						\
     94	new_c "\n"							\
     95	".option pop\n"							\
     96	"889 :\n"							\
     97	".org	. - (887b - 886b) + (889b - 888b)\n"			\
     98	".org	. - (889b - 888b) + (887b - 886b)\n"			\
     99	".previous\n"							\
    100	".endif\n"
    101
    102#define __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, enable)	\
    103	"886 :\n"							\
    104	".option push\n"						\
    105	".option norvc\n"						\
    106	".option norelax\n"						\
    107	old_c "\n"							\
    108	".option pop\n"							\
    109	"887 :\n"							\
    110	ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c)
    111
    112#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k)	\
    113	__ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k))
    114
    115#define __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
    116					enable_1,			\
    117				   new_c_2, vendor_id_2, errata_id_2,	\
    118					enable_2)			\
    119	"886 :\n"							\
    120	".option push\n"						\
    121	".option norvc\n"						\
    122	".option norelax\n"						\
    123	old_c "\n"							\
    124	".option pop\n"							\
    125	"887 :\n"							\
    126	ALT_NEW_CONTENT(vendor_id_1, errata_id_1, enable_1, new_c_1)	\
    127	ALT_NEW_CONTENT(vendor_id_2, errata_id_2, enable_2, new_c_2)
    128
    129#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
    130					CONFIG_k_1,			\
    131				  new_c_2, vendor_id_2, errata_id_2,	\
    132					CONFIG_k_2)			\
    133	__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
    134					IS_ENABLED(CONFIG_k_1),		\
    135				   new_c_2, vendor_id_2, errata_id_2,	\
    136					IS_ENABLED(CONFIG_k_2))
    137
    138#endif /* __ASSEMBLY__ */
    139
    140#else /* CONFIG_RISCV_ALTERNATIVE */
    141#ifdef __ASSEMBLY__
    142
    143.macro __ALTERNATIVE_CFG old_c
    144	\old_c
    145.endm
    146
    147#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
    148	__ALTERNATIVE_CFG old_c
    149
    150#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
    151					CONFIG_k_1,			\
    152				  new_c_2, vendor_id_2, errata_id_2,	\
    153					CONFIG_k_2)			\
    154       __ALTERNATIVE_CFG old_c
    155
    156#else /* !__ASSEMBLY__ */
    157
    158#define __ALTERNATIVE_CFG(old_c)  \
    159	old_c "\n"
    160
    161#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
    162	__ALTERNATIVE_CFG(old_c)
    163
    164#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1,	\
    165					CONFIG_k_1,			\
    166				  new_c_2, vendor_id_2, errata_id_2,	\
    167					CONFIG_k_2) \
    168       __ALTERNATIVE_CFG(old_c)
    169
    170#endif /* __ASSEMBLY__ */
    171#endif /* CONFIG_RISCV_ALTERNATIVE */
    172
    173/*
    174 * Usage:
    175 *   ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k)
    176 * in the assembly code. Otherwise,
    177 *   asm(ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k));
    178 *
    179 * old_content: The old content which is probably replaced with new content.
    180 * new_content: The new content.
    181 * vendor_id: The CPU vendor ID.
    182 * errata_id: The errata ID.
    183 * CONFIG_k: The Kconfig of this errata. When Kconfig is disabled, the old
    184 *	     content will alwyas be executed.
    185 */
    186#define ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) \
    187	_ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k)
    188
    189/*
    190 * A vendor wants to replace an old_content, but another vendor has used
    191 * ALTERNATIVE() to patch its customized content at the same location. In
    192 * this case, this vendor can create a new macro ALTERNATIVE_2() based
    193 * on the following sample code and then replace ALTERNATIVE() with
    194 * ALTERNATIVE_2() to append its customized content.
    195 */
    196#define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1,		\
    197					errata_id_1, CONFIG_k_1,	\
    198				   new_content_2, vendor_id_2,		\
    199					errata_id_2, CONFIG_k_2)	\
    200	_ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1,	\
    201					    errata_id_1, CONFIG_k_1,	\
    202					new_content_2, vendor_id_2,	\
    203					    errata_id_2, CONFIG_k_2)
    204
    205#endif