diff mbox series

[v11,2/7] linux: Introduce INTERNAL_VSYSCALL

Message ID 20240110205140.754849-3-evan@rivosinc.com
State Superseded
Headers
Series RISC-V: ifunced memcpy using new kernel hwprobe interface |

Checks

Context Check Description
redhat-pt-bot/TryBot-apply_patch success Patch applied to master at the time it was sent
linaro-tcwg-bot/tcwg_glibc_build--master-aarch64 success Testing passed
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Commit Message

Evan Green Jan. 10, 2024, 8:51 p.m. UTC 
  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>
---

(no changes since v10)

Changes in v10:
 - Introduced INTERNAL_VSYSCALL patch

 sysdeps/unix/sysv/linux/sysdep-vdso.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h
index 189319ad98..f7d4b29b25 100644
--- a/sysdeps/unix/sysv/linux/sysdep-vdso.h
+++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h
@@ -53,4 +53,23 @@ 
     sc_ret;								      \
   })
 
+#define INTERNAL_VSYSCALL(name, nr, args...)				      \
+  ({									      \
+    __label__ out;							      \
+    long int sc_ret;							      \
+									      \
+    __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name);	      \
+    if (vdsop != NULL)							      \
+      {									      \
+	sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args);	      	      \
+	if ((!INTERNAL_SYSCALL_ERROR_P (sc_ret)) ||			      \
+	    (INTERNAL_SYSCALL_ERRNO (sc_ret) != ENOSYS))		      \
+	  goto out;							      \
+      }									      \
+									      \
+    sc_ret = INTERNAL_SYSCALL_CALL (name, ##args);		      	      \
+  out:									      \
+    sc_ret;								      \
+  })
+
 #endif /* SYSDEP_VDSO_LINUX_H  */