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| author | fishsoupisgood <github@madingley.org> | 2019-04-29 01:17:54 +0100 |
|---|---|---|
| committer | fishsoupisgood <github@madingley.org> | 2019-05-27 03:43:43 +0100 |
| commit | 3f2546b2ef55b661fd8dd69682b38992225e86f6 (patch) | |
| tree | 65ca85f13617aee1dce474596800950f266a456c /roms/ipxe/src/arch/i386/include/bits/compiler.h | |
| download | qemu-master.tar.gz qemu-master.tar.bz2 qemu-master.zip | |
Diffstat (limited to 'roms/ipxe/src/arch/i386/include/bits/compiler.h')
| -rw-r--r-- | roms/ipxe/src/arch/i386/include/bits/compiler.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/roms/ipxe/src/arch/i386/include/bits/compiler.h b/roms/ipxe/src/arch/i386/include/bits/compiler.h new file mode 100644 index 00000000..d48b4b38 --- /dev/null +++ b/roms/ipxe/src/arch/i386/include/bits/compiler.h @@ -0,0 +1,38 @@ +#ifndef _BITS_COMPILER_H +#define _BITS_COMPILER_H + +FILE_LICENCE ( GPL2_OR_LATER ); + +#ifndef ASSEMBLY + +/** Declare a function with standard calling conventions */ +#define __asmcall __attribute__ (( cdecl, regparm(0) )) + +/** + * Declare a function with libgcc implicit linkage + * + * It seems as though gcc expects its implicit arithmetic functions to + * be cdecl, even if -mrtd is specified. This is somewhat + * inconsistent; for example, if -mregparm=3 is used then the implicit + * functions do become regparm(3). + * + * The implicit calls to memcpy() and memset() which gcc can generate + * do not seem to have this inconsistency; -mregparm and -mrtd affect + * them in the same way as any other function. + * + * Update (25/4/14): it appears that more recent gcc versions do allow + * -mrtd to affect calls to the implicit arithmetic functions. There + * is nothing obvious in the gcc changelogs to indicate precisely when + * this happened. From experimentation with available gcc versions, + * the change occurred sometime between v4.6.3 and v4.7.2. We assume + * that only versions up to v4.6.x require the special treatment. + */ +#if ( __GNUC__ < 4 ) || ( ( __GNUC__ == 4 ) && ( __GNUC_MINOR__ <= 6 ) ) +#define __libgcc __attribute__ (( cdecl )) +#else +#define __libgcc +#endif + +#endif /* ASSEMBLY */ + +#endif /* _BITS_COMPILER_H */ |