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-rw-r--r--libc/sysdeps/linux/xtensa/mmap.S57
1 files changed, 57 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/xtensa/mmap.S b/libc/sysdeps/linux/xtensa/mmap.S
new file mode 100644
index 000000000..c991e7d27
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/mmap.S
@@ -0,0 +1,57 @@
+/* Copyright (C) 2005, 2007 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+#include "sysdep.h"
+#include <sys/syscall.h>
+
+#define PAGE_SHIFT 12
+
+/* __ptr_t __mmap (a2 = __ptr_t addr,
+ a3 = size_t len,
+ a4 = int prot,
+ a5 = int flags,
+ a6 = int fd,
+ a7 = off_t offset) */
+
+ENTRY (__mmap)
+
+ /* We only support mmap2 in the kernel, so shift offset by
+ page - size. */
+ mov a8, a6
+ mov a6, a2
+ movi a2, SYS_ify (mmap2)
+ srli a9, a7, PAGE_SHIFT
+
+ /* syscall (a2 = NR_mmap2,
+ a6 = arg0,
+ a3 = arg1,
+ a4 = arg2,
+ a5 = arg3,
+ a8 = arg4,
+ a9 = arg5) */
+
+ syscall
+ bltz a2, SYSCALL_ERROR_LABEL
+
+.Lpseudo_end:
+ retw
+
+PSEUDO_END (__mmap)
+
+weak_alias (__mmap, mmap)
+libc_hidden_weak (mmap)