mirrors/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe.git synced 2026-01-21 08:31:37 +01:00
Code Issues Packages Projects Releases Wiki Activity

[build] Allow for per-architecture unprefixed constant operand modifier

Browse Source 
Over the years, the undocumented operand modifier used to produce the
unprefixed constant values in __einfo_error() has varied from "%c0" to
"%a0" in commit 1a77466 ("[build] Fix use of inline assembly on GCC
4.8 ARM64 builds") and back to "%c0" in commit 3fb3ffc ("[build] Fix
use of inline assembly on GCC 8 ARM64 builds"), according to the
evolving demands of the toolchain.

LoongArch64 suffers from a similar issue: GCC 13 will allow either,
but the currently released GCC 12 allows only the "%a0" form.

Introduce a macro ASM_NO_PREFIX, defined in bits/compiler.h, to
abstract away this difference and allow different architectures to use
different operand modifiers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2023-02-05 23:55:14 +00:00
parent a2bed43939
commit c6901792f0
5 changed files with 14 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/arch/arm32/include/bits/compiler.h
View File

@ -8,6 +8,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifndef ASSEMBLY
/** Unprefixed constant operand modifier */
#define ASM_NO_PREFIX "c"
#define __asmcall
#define __libgcc

3
src/arch/arm64/include/bits/compiler.h
View File

@ -8,6 +8,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifndef ASSEMBLY
/** Unprefixed constant operand modifier */
#define ASM_NO_PREFIX "c"
#define __asmcall
#define __libgcc

3
src/arch/i386/include/bits/compiler.h
View File

@ -8,6 +8,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifndef ASSEMBLY
/** Unprefixed constant operand modifier */
#define ASM_NO_PREFIX "c"
/** Declare a function with standard calling conventions */
#define __asmcall __attribute__ (( cdecl, regparm(0) ))

3
src/arch/x86_64/include/bits/compiler.h
View File

@ -8,6 +8,9 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifndef ASSEMBLY
/** Unprefixed constant operand modifier */
#define ASM_NO_PREFIX "c"
/** Declare a function with standard calling conventions */
#define __asmcall __attribute__ (( regparm(0) ))

4
src/include/errno.h
View File

@ -262,10 +262,10 @@ static inline void eplatform_discard ( int dummy __unused, ... ) {}
".balign 8\n\t" \
"\n1:\n\t" \
".long ( 4f - 1b )\n\t" \
".long %c0\n\t" \
".long %" ASM_NO_PREFIX "0\n\t" \
".long ( 2f - 1b )\n\t" \
".long ( 3f - 1b )\n\t" \
".long %c1\n\t" \
".long %" ASM_NO_PREFIX "1\n\t" \
"\n2:\t.asciz \"" __einfo_desc ( einfo ) "\"\n\t" \
"\n3:\t.asciz \"" __FILE__ "\"\n\t" \
".balign 8\n\t" \