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| author | Zack Weinberg <zackw@panix.com> | 2019-02-19 08:45:22 -0500 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2020-01-08 12:52:49 -0500 |
| commit | 9d8ecbbf117a1f3ddeb6b80a4e242d43a1f6d390 (patch) | |
| tree | c5f0bfa9f64c2a880e7f08e477bcab55be6edd4c /sysdeps/unix/sysv/linux/alpha/bits/typesizes.h | |
| parent | 6de42c53304928eb43ac2153a7b2bc6596e5ffdf (diff) | |
| download | glibc-9d8ecbbf117a1f3ddeb6b80a4e242d43a1f6d390.tar.gz glibc-9d8ecbbf117a1f3ddeb6b80a4e242d43a1f6d390.tar.xz glibc-9d8ecbbf117a1f3ddeb6b80a4e242d43a1f6d390.zip | |
Define register_t using bits/typesizes.h macros.
Currently register_t is, unlike all other types in sys/types.h,
defined using a GCC extension (__attribute__((mode(word)))), falling
back to ‘int’ if the extension is unavailable. This is a potential
ABI compatibility hazard for people using non-GNU compilers with
glibc. It’s also unnecessary; the bits/typesizes.h mechanism can
handle all of the existing variation in the definition. In most
cases, defining __REGISTER_T_TYPE as __SWORD_TYPE is sufficient.
Special handling is necessary for MIPS n32 and x86-64 x32, where
__SWORD_TYPE is ‘int’ and the appropriate type for register_t is
‘long long’. Unfortunately, this means we need to create a new
bits/typesizes.h variant for linux/mips. This variant is based
on the top-level bits/typesizes.h, not linux/generic/bits/typesizes.h,
to match the existing MIPS ABIs.
Tested using build-many-glibcs. The c++-types test confirms that the
physical type of register_t does not change on any supported platform.
* posix/sys/types.h: Typedef register_t as __register_t.
* posix/bits/types.h: Typedef __register_t using __REGISTER_T_TYPE.
* bits/typesizes.h
* sysdeps/mach/hurd/bits/typesizes.h
* sysdeps/unix/sysv/linux/alpha/bits/typesizes.h
* sysdeps/unix/sysv/linux/generic/bits/typesizes.h
* sysdeps/unix/sysv/linux/s390/bits/typesizes.h
* sysdeps/unix/sysv/linux/sparc/bits/typesizes.h:
Define __REGISTER_T_TYPE as __SWORD_TYPE.
* sysdeps/unix/sysv/linux/mips/bits/typesizes.h:
New file (copied from bits/typesizes.h).
Define __REGISTER_T_TYPE as __SWORD_TYPE for o32 and n64 ABIs.
Define __REGISTER_T_TYPE as __SQUAD_TYPE for n32.
* sysdeps/unix/sysv/linux/x86/bits/typesizes.h:
Define __REGISTER_T_TYPE as __SWORD_TYPE for o32 and 64-bit ABIs.
Define __REGISTER_T_TYPE as __SQUAD_TYPE for x32.
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/bits/typesizes.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/bits/typesizes.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h b/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h index 30356ba6d6..44e5381822 100644 --- a/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h +++ b/sysdeps/unix/sysv/linux/alpha/bits/typesizes.h @@ -60,6 +60,7 @@ #define __SYSCALL_ULONG_TYPE __ULONGWORD_TYPE #define __CPU_MASK_TYPE __ULONGWORD_TYPE #define __FSWORD_T_TYPE __S32_TYPE +#define __REGISTER_T_TYPE __SWORD_TYPE /* Tell the libc code that off_t and off64_t are actually the same type for all ABI purposes, even if possibly expressed as different base types |