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[PATCH/committed] ia64: syscall: add some helpful documentation
- From: Mike Frysinger <vapier at gentoo dot org>
- To: libc-alpha at sourceware dot org
- Date: Sun, 29 Dec 2013 16:29:40 -0500
- Subject: [PATCH/committed] ia64: syscall: add some helpful documentation
- Authentication-results: sourceware.org; auth=none
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