mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-06-13 11:50:25 -04:00
f811f58597
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This originally was a completely mechanical patch (done with a simple "sed -i" statement), with some manual fixups during rebasing of the patch later. Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: linux-riscv@lists.infradead.org Signed-off-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/r/20250606070952.498274-3-thuth@redhat.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
162 lines
5.0 KiB
C
162 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_ALTERNATIVE_MACROS_H
|
|
#define __ASM_ALTERNATIVE_MACROS_H
|
|
|
|
#ifdef CONFIG_RISCV_ALTERNATIVE
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
.macro ALT_ENTRY oldptr newptr vendor_id patch_id new_len
|
|
.4byte \oldptr - .
|
|
.4byte \newptr - .
|
|
.2byte \vendor_id
|
|
.2byte \new_len
|
|
.4byte \patch_id
|
|
.endm
|
|
|
|
.macro ALT_NEW_CONTENT vendor_id, patch_id, enable = 1, new_c
|
|
.if \enable
|
|
.pushsection .alternative, "a"
|
|
ALT_ENTRY 886b, 888f, \vendor_id, \patch_id, 889f - 888f
|
|
.popsection
|
|
.subsection 1
|
|
888 :
|
|
.option push
|
|
.option norvc
|
|
.option norelax
|
|
\new_c
|
|
.option pop
|
|
889 :
|
|
.org . - (889b - 888b) + (887b - 886b)
|
|
.org . - (887b - 886b) + (889b - 888b)
|
|
.previous
|
|
.endif
|
|
.endm
|
|
|
|
.macro ALTERNATIVE_CFG old_c, new_c, vendor_id, patch_id, enable
|
|
886 :
|
|
.option push
|
|
.option norvc
|
|
.option norelax
|
|
\old_c
|
|
.option pop
|
|
887 :
|
|
ALT_NEW_CONTENT \vendor_id, \patch_id, \enable, "\new_c"
|
|
.endm
|
|
|
|
.macro ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, patch_id_1, enable_1, \
|
|
new_c_2, vendor_id_2, patch_id_2, enable_2
|
|
ALTERNATIVE_CFG "\old_c", "\new_c_1", \vendor_id_1, \patch_id_1, \enable_1
|
|
ALT_NEW_CONTENT \vendor_id_2, \patch_id_2, \enable_2, "\new_c_2"
|
|
.endm
|
|
|
|
#define __ALTERNATIVE_CFG(...) ALTERNATIVE_CFG __VA_ARGS__
|
|
#define __ALTERNATIVE_CFG_2(...) ALTERNATIVE_CFG_2 __VA_ARGS__
|
|
|
|
#else /* !__ASSEMBLER__ */
|
|
|
|
#include <asm/asm.h>
|
|
#include <linux/stringify.h>
|
|
|
|
#define ALT_ENTRY(oldptr, newptr, vendor_id, patch_id, newlen) \
|
|
".4byte ((" oldptr ") - .) \n" \
|
|
".4byte ((" newptr ") - .) \n" \
|
|
".2byte " vendor_id "\n" \
|
|
".2byte " newlen "\n" \
|
|
".4byte " patch_id "\n"
|
|
|
|
#define ALT_NEW_CONTENT(vendor_id, patch_id, enable, new_c) \
|
|
".if " __stringify(enable) " == 1\n" \
|
|
".pushsection .alternative, \"a\"\n" \
|
|
ALT_ENTRY("886b", "888f", __stringify(vendor_id), __stringify(patch_id), "889f - 888f") \
|
|
".popsection\n" \
|
|
".subsection 1\n" \
|
|
"888 :\n" \
|
|
".option push\n" \
|
|
".option norvc\n" \
|
|
".option norelax\n" \
|
|
new_c "\n" \
|
|
".option pop\n" \
|
|
"889 :\n" \
|
|
".org . - (887b - 886b) + (889b - 888b)\n" \
|
|
".org . - (889b - 888b) + (887b - 886b)\n" \
|
|
".previous\n" \
|
|
".endif\n"
|
|
|
|
#define __ALTERNATIVE_CFG(old_c, new_c, vendor_id, patch_id, enable) \
|
|
"886 :\n" \
|
|
".option push\n" \
|
|
".option norvc\n" \
|
|
".option norelax\n" \
|
|
old_c "\n" \
|
|
".option pop\n" \
|
|
"887 :\n" \
|
|
ALT_NEW_CONTENT(vendor_id, patch_id, enable, new_c)
|
|
|
|
#define __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, patch_id_1, enable_1, \
|
|
new_c_2, vendor_id_2, patch_id_2, enable_2) \
|
|
__ALTERNATIVE_CFG(old_c, new_c_1, vendor_id_1, patch_id_1, enable_1) \
|
|
ALT_NEW_CONTENT(vendor_id_2, patch_id_2, enable_2, new_c_2)
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, patch_id, CONFIG_k) \
|
|
__ALTERNATIVE_CFG(old_c, new_c, vendor_id, patch_id, IS_ENABLED(CONFIG_k))
|
|
|
|
#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, patch_id_1, CONFIG_k_1, \
|
|
new_c_2, vendor_id_2, patch_id_2, CONFIG_k_2) \
|
|
__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, patch_id_1, IS_ENABLED(CONFIG_k_1), \
|
|
new_c_2, vendor_id_2, patch_id_2, IS_ENABLED(CONFIG_k_2))
|
|
|
|
#else /* CONFIG_RISCV_ALTERNATIVE */
|
|
#ifdef __ASSEMBLER__
|
|
|
|
.macro ALTERNATIVE_CFG old_c
|
|
\old_c
|
|
.endm
|
|
|
|
#define __ALTERNATIVE_CFG(old_c, ...) ALTERNATIVE_CFG old_c
|
|
#define __ALTERNATIVE_CFG_2(old_c, ...) ALTERNATIVE_CFG old_c
|
|
|
|
#else /* !__ASSEMBLER__ */
|
|
|
|
#define __ALTERNATIVE_CFG(old_c, ...) old_c "\n"
|
|
#define __ALTERNATIVE_CFG_2(old_c, ...) old_c "\n"
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#define _ALTERNATIVE_CFG(old_c, ...) __ALTERNATIVE_CFG(old_c)
|
|
#define _ALTERNATIVE_CFG_2(old_c, ...) __ALTERNATIVE_CFG_2(old_c)
|
|
|
|
#endif /* CONFIG_RISCV_ALTERNATIVE */
|
|
|
|
/*
|
|
* Usage:
|
|
* ALTERNATIVE(old_content, new_content, vendor_id, patch_id, CONFIG_k)
|
|
* in the assembly code. Otherwise,
|
|
* asm(ALTERNATIVE(old_content, new_content, vendor_id, patch_id, CONFIG_k));
|
|
*
|
|
* old_content: The old content which is probably replaced with new content.
|
|
* new_content: The new content.
|
|
* vendor_id: The CPU vendor ID.
|
|
* patch_id: The patch ID (erratum ID or cpufeature ID).
|
|
* CONFIG_k: The Kconfig of this patch ID. When Kconfig is disabled, the old
|
|
* content will always be executed.
|
|
*/
|
|
#define ALTERNATIVE(old_content, new_content, vendor_id, patch_id, CONFIG_k) \
|
|
_ALTERNATIVE_CFG(old_content, new_content, vendor_id, patch_id, CONFIG_k)
|
|
|
|
/*
|
|
* A vendor wants to replace an old_content, but another vendor has used
|
|
* ALTERNATIVE() to patch its customized content at the same location. In
|
|
* this case, this vendor can create a new macro ALTERNATIVE_2() based
|
|
* on the following sample code and then replace ALTERNATIVE() with
|
|
* ALTERNATIVE_2() to append its customized content.
|
|
*/
|
|
#define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1, \
|
|
new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2) \
|
|
_ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1, \
|
|
new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2)
|
|
|
|
#endif
|