From 83fcbc9f9c570a419e3cc4f9de87e2666e76b70a Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Mon, 9 Apr 2001 04:44:45 +0000 Subject: [PATCH] mmap64 implementation for Linux/CRIS. --- sysdeps/unix/sysv/linux/cris/mmap64.S | 91 +++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/cris/mmap64.S diff --git a/sysdeps/unix/sysv/linux/cris/mmap64.S b/sysdeps/unix/sysv/linux/cris/mmap64.S new file mode 100644 index 0000000..acf6ca3 --- /dev/null +++ b/sysdeps/unix/sysv/linux/cris/mmap64.S @@ -0,0 +1,91 @@ +/* Copyright (C) 2001 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +#include "kernel-features.h" + +#include + +/* Rather than dragging in yet another kernel file, , we + define it here. Provide for easy override. */ +#ifndef PAGE_SHIFT +#define PAGE_SHIFT 13 +#endif + +/* This is: __ptr_t + __mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, + off64_t offset); */ + +/* This was done in C, but the resulting code didn't look anywhere near + nice, and mmap64 is important enough to have fast code. Rather than + fixing (the generic bits in) gcc, we make sure not to depend on it by + writing code that GCC cannot reasonably generate. */ + + .syntax no_register_prefix + +ENTRY (__mmap64) + + move [sp],mof + move.d [sp+4],r9 + + /* Only accept an offset being a multiple of PAGE_SIZE, ditto address. */ + btstq (PAGE_SHIFT - 1),r9 + bne 1f + lsrq PAGE_SHIFT,r9 + + btstq (PAGE_SHIFT - 1),r10 + bne 1f + move.d r9,[sp] + + /* We have to store the adjusted part somewhere we can "or" from. + No registers available, so let's re-use the incoming low-part + parameter location. */ + move.d [sp+8],r9 + + swapwbr r9 + /* Check if the highest bits (now the lowest bits) are zero. They + must be, since we're actually calling a system function + specifying the size in *pages* in a single dword. Thus you can + mmap64 PAGE_SIZE * 4 Gbyte. */ + btstq (PAGE_SHIFT - 1),r9 + bne 1f + swapwbr r9 + + lslq (32 - PAGE_SHIFT),r9 + or.d [sp],r9 + move srp,[sp] + move r9,srp + + movu.b SYS_ify (mmap2),r9 + break 13 + + cmps.w -4096,r10 + bhs 0f + move [sp],srp + + Ret + nop + +/* Local error handler. */ +1: + movs.w -EINVAL,r10 + /* Drop through into the ordinary error handler. */ +PSEUDO_END (__mmap64) + +weak_alias (__mmap64, mmap64) -- 2.7.4