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| author | Evan Green <evan@rivosinc.com> | 2024-02-27 14:56:38 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-03-01 07:14:56 -0800 |
| commit | c6c33339b45281590f9db138ba6c9d79acb1da27 (patch) | |
| tree | 0734d08f9d44f8b1c28ca687f5339e737f8e3693 | |
| parent | 426d0e1aa8f17426d13707594111df712d2b8911 (diff) | |
| download | glibc-c6c33339b45281590f9db138ba6c9d79acb1da27.tar.gz glibc-c6c33339b45281590f9db138ba6c9d79acb1da27.tar.xz glibc-c6c33339b45281590f9db138ba6c9d79acb1da27.zip | |
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>
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysdep-vdso.h | 12 |
1 files changed, 12 insertions, 0 deletions
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 */ |