diff options
Diffstat (limited to 'libc/sysdeps/linux/i960/mmap.S')
| -rw-r--r-- | libc/sysdeps/linux/i960/mmap.S | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/libc/sysdeps/linux/i960/mmap.S b/libc/sysdeps/linux/i960/mmap.S deleted file mode 100644 index 63a284384..000000000 --- a/libc/sysdeps/linux/i960/mmap.S +++ /dev/null @@ -1,51 +0,0 @@ -# -# __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, see <http://www.gnu.org/licenses/>. -# -# 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 |