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List:       glibc-alpha
Subject:    [PATCH/committed] ia64: syscall: add some helpful documentation
From:       Mike Frysinger <vapier () gentoo ! org>
Date:       2013-12-29 21:29:40
Message-ID: 1388352580-11078-1-git-send-email-vapier () gentoo ! org
[Download RAW message or body]

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 ports/ChangeLog.ia64                         | 4 ++++
 ports/sysdeps/unix/sysv/linux/ia64/syscall.S | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/ports/ChangeLog.ia64 b/ports/ChangeLog.ia64
index 34391c1..8e9b24d 100644
--- a/ports/ChangeLog.ia64
+++ b/ports/ChangeLog.ia64
@@ -1,3 +1,7 @@
+2013-12-29  Mike Frysinger  <vapier@gentoo.org>
+
+	* sysdeps/unix/sysv/linux/ia64/syscall.S: Add a comment.
+
 2013-12-25  Mike Frysinger  <vapier@gentoo.org>
 
 	* sysdeps/unix/sysv/linux/ia64/nptl/lowlevellock.h
diff --git a/ports/sysdeps/unix/sysv/linux/ia64/syscall.S b/ports/sysdeps/unix/sysv/linux/ia64/syscall.S
index 8bb77d2..4cd75b8 100644
--- a/ports/sysdeps/unix/sysv/linux/ia64/syscall.S
+++ b/ports/sysdeps/unix/sysv/linux/ia64/syscall.S
@@ -19,6 +19,10 @@
 #include <sysdep.h>
 
 ENTRY(syscall)
+	/* We are called like so:
+	   {out0,out1,...,out6} registers -> {NR, arg1, ..., arg6}
+	   Shift the register window so that {out1...out6} are available
+	   in {out0...out5} like the kernel syscall handler expects.  */
 	alloc r2=ar.pfs,1,0,8,0
 	mov r15=r32		/* syscall number */
 	break __BREAK_SYSCALL
-- 
1.8.4.3

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