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From: Palmer Dabbelt <palmer@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] linux: Introduce INTERNAL_VSYSCALL Date: Fri, 1 Mar 2024 15:17:33 +0000 (GMT) [thread overview] Message-ID: <20240301151733.DC3D03858C66@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c6c33339b45281590f9db138ba6c9d79acb1da27 commit c6c33339b45281590f9db138ba6c9d79acb1da27 Author: Evan Green <evan@rivosinc.com> Date: Tue Feb 27 14:56:38 2024 -0800 linux: Introduce INTERNAL_VSYSCALL 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> Diff: --- sysdeps/unix/sysv/linux/sysdep-vdso.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index 189319ad98..2f53ada6e5 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -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 */
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