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linux: Introduce INTERNAL_VSYSCALL

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Add an INTERNAL_VSYSCALL() macro that makes a vDSO call, falling back to
a regular syscall, but without setting errno. Instead, the return value
is plumbed straight out of the macro.

Signed-off-by: Evan Green <evan@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Evan Green 2024-02-27 14:56:38 -08:00 committed by Palmer Dabbelt
parent 426d0e1aa8
commit c6c33339b4
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1 changed files with 12 additions and 0 deletions
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12
sysdeps/unix/sysv/linux/sysdep-vdso.h
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@ -53,4 +53,16 @@
sc_ret; \
})
#define INTERNAL_VSYSCALL(name, nr, args...) \
({ \
long int sc_ret = -ENOSYS; \
\
__typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \
if (vdsop != NULL) \
sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args); \
if (sc_ret == -ENOSYS) \
sc_ret = INTERNAL_SYSCALL_CALL (name, ##args); \
sc_ret; \
})
#endif /* SYSDEP_VDSO_LINUX_H */