[v13,2/7] linux: Introduce INTERNAL_VSYSCALL
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Commit Message
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>
---
Changes in v13:
- Remove label, use -ENOSYS and return value directly (Florian)
Changes in v10:
- Introduced INTERNAL_VSYSCALL patch
sysdeps/unix/sysv/linux/sysdep-vdso.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
@@ -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 */