Patch from Martin Proulx <mproulx@okiok.com> to support

the i960 architecture.

1 files changed, 52 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/i960/_mmap.S b/libc/sysdeps/linux/i960/_mmap.S
new file mode 100644
index 000000000..bc4267948
--- /dev/null
+++ b/libc/sysdeps/linux/i960/_mmap.S
@@ -0,0 +1,52 @@
+#
+# __mmap.S, part of the i960 support for the uClibc library.
+#
+# Copyright (C) 2002 by Okiok Data Ltd.  http://www.okiok.com/
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU Library General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option) any
+# later version.
+#
+# This program 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 Library General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Library General Public License
+# along with this program; if not, write to the Free Software Foundation, Inc.,
+# at 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# Derived from an old port of uC-libc to the i960 by Keith Adams (kma@cse.ogi.edu).
+#
+
+#include <sys/syscall.h>
+
+/* This is a plain system call.  The 6 arguments are already set up correctly */
+/* void  *  mmap(void  *start,  size_t length, int prot , int flags, int fd, off_t offset) */
+     
+           
+        .globl _mmap
+_mmap:  
+        mov     g13, r3
+        ldconst __NR_mmap, g13
+        calls   0
+        mov     r3, g13
+
+        /* We now need to check if the return value is a small negative integer.                    */
+        /* This is somewhat tricky as the return code (normally an address) is an                   */
+        /* unsigned type, or an ordinal in i960 assembler.                                          */
+        /* We'll use the fact that, integers from -256 to -1 are ordinals 0xFFFFFF00 to 0xFFFFFFFF. */
+        /* So by checking that the return address is in the top range of the ordinals, we'll        */
+        /* in fact be checking if it's not an encoded negated erro code.                            */
+
+        /* The range -256 to -1 should be enough since that in uClinux 2.0.39, there are            */
+        /* 124 system calls for the i960.                                                           */
+        
+        ldconst 0xFFFFFF00, r3  /* This is the integer's -256 representation */
+        cmpobl  g0, r3, 1f      /* Something smaller than this means it's out of the range, and a valid address */
+        subi    g0, 0, r3       /* If it's an errno, save its negated (now positive) value in _errno. */
+        st      r3, _errno      
+        subi    1, 0, g0        /* And return -1. */
+1:
+        ret