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arm64: asm: Add new-style position independent function annotations

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commit 35e61c77ef386555f3df1bc2057098c6997ca10b upstream.

As part of an effort to make the annotations in assembly code clearer and
more consistent new macros have been introduced, including replacements
for ENTRY() and ENDPROC().

On arm64 we have ENDPIPROC(), a custom version of ENDPROC() which is
used for code that will need to run in position independent environments
like EFI, it creates an alias for the function with the prefix __pi_ and
then emits the standard ENDPROC. Add new-style macros to replace this
which expand to the standard SYM_FUNC_*() and SYM_FUNC_ALIAS_*(),
resulting in the same object code. These are added in linkage.h for
consistency with where the generic assembler code has its macros.

[will: Rename 'WEAK' macro, use ';' instead of ASM_NL, deprecate ENDPIPROC]

Change-Id: I30ea7f45da24be8fb7cd6e177ae65bf9d4c227b9
Cc: Jian Cai <jiancai@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
This commit is contained in:
Mark Brown 2021-07-16 22:42:59 +05:30 committed by Richard Raya
parent bb4d39d207
commit 2a653458b8
2 changed files with 17 additions and 0 deletions
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1
arch/arm64/include/asm/assembler.h
View File

@ -458,6 +458,7 @@ alternative_endif
.endm
/*
* Deprecated! Use SYM_FUNC_{START,START_WEAK,END}_PI instead.
* Annotate a function as position independent, i.e., safe to be called before
* the kernel virtual mapping is activated.
*/

16
arch/arm64/include/asm/linkage.h
View File

@ -4,4 +4,20 @@
#define __ALIGN .align 2
#define __ALIGN_STR ".align 2"
/*
* Annotate a function as position independent, i.e., safe to be called before
* the kernel virtual mapping is activated.
*/
#define SYM_FUNC_START_PI(x) \
SYM_FUNC_START_ALIAS(__pi_##x); \
SYM_FUNC_START(x)
#define SYM_FUNC_START_WEAK_PI(x) \
SYM_FUNC_START_ALIAS(__pi_##x); \
SYM_FUNC_START_WEAK(x)
#define SYM_FUNC_END_PI(x) \
SYM_FUNC_END(x); \
SYM_FUNC_END_ALIAS(__pi_##x)
#endif