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mips: Use Linux kABI for syscall return

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It changes the mips INTERNAL_SYSCALL* and internal_syscall*  macros
to return a negative value instead of the 'a3' register value on then
'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.
The redefinition of INTERNAL_VSYSCALL_CALL is also no longer
required.

Checked on mips64-linux-gnu, mips64n32-linux-gnu, and mips-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2020-02-03 11:52:43 -03:00
parent ebb4aed873
commit cf1e05f599
3 changed files with 23 additions and 53 deletions
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16
sysdeps/unix/sysv/linux/mips/sysdep.h
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@ -28,19 +28,3 @@
#endif
#define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
#define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
#ifndef __ASSEMBLER__
/* Standard MIPS syscalls have an error flag, and return a positive errno
when the error flag is set. Emulate this behaviour for vsyscalls so that
the INTERNAL_SYSCALL_{ERROR_P,ERRNO} macros work correctly. */
#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
({ \
long int _ret = funcptr (args); \
err = ((unsigned long int) (_ret) >= (unsigned long int) -4095L); \
if (err) \
_ret = -_ret; \
_ret; \
})
#endif /* __ASSEMBLER__ */