From 124ec188720b6bdea85ade49e7ea195161b12fce Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Sat, 5 Jan 2008 10:05:27 +0000 Subject: Chris Zankel writes: The following patches add support for the Xtensa processor architecture to uClibc. They are based on a recent SVN checkout (12/05/2007). The first patch (attached to this post) adds Xtensa support to various shared configuration and make files. The following patches then include the Xtensa specific files and directories. I welcome any feedback and would appreciate it if you could include the patches into the mainline tree. I am certainly committed to maintain the port. Bob Wilson was kind enough to review the patches. Some notes about the architecture: Xtensa is a configurable and extensible processor architecture developed by Tensilica. For more information, please visit: www.linux-xtensa.org. --- libc/sysdeps/linux/xtensa/windowspill.S | 95 +++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 libc/sysdeps/linux/xtensa/windowspill.S (limited to 'libc/sysdeps/linux/xtensa/windowspill.S') diff --git a/libc/sysdeps/linux/xtensa/windowspill.S b/libc/sysdeps/linux/xtensa/windowspill.S new file mode 100644 index 000000000..950c27b1b --- /dev/null +++ b/libc/sysdeps/linux/xtensa/windowspill.S @@ -0,0 +1,95 @@ +/* Function to force register windows to the stack. + 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 + + .text + .align 4 + .literal_position + .global __window_spill + .type __window_spill, @function +__window_spill: + entry a1, 48 + bbci.l a0, 31, .L4 // branch if called with call4 + bbsi.l a0, 30, .L12 // branch if called with call12 + + /* Called with call8: touch register NUM_REGS-12 (4/20/52) */ +.L8: +#if XCHAL_NUM_AREGS > 16 + call12 1f + retw + + .align 4 +1: _entry a1, 48 // touch NUM_REGS-24 (x/8/40) + +#if XCHAL_NUM_AREGS == 32 + mov a8, a0 + retw +#else + _entry a1, 48 // touch NUM_REGS-36 (x/x/28) + mov a12, a0 + _entry a1, 48 // touch NUM_REGS-48 (x/x/16) + mov a12, a0 + _entry a1, 16 // touch NUM_REGS-60 (x/x/4) +#endif +#endif + mov a4, a0 + retw + + /* Called with call4: touch register NUM_REGS-8 (8/24/56) */ +.L4: +#if XCHAL_NUM_AREGS == 16 + mov a8, a0 +#else + call12 1f + retw + + .align 4 +1: _entry a1, 48 // touch NUM_REGS-20 (x/12/44) + mov a12, a0 +#if XCHAL_NUM_AREGS > 32 + _entry a1, 48 // touch NUM_REGS-32 (x/x/32) + mov a12, a0 + _entry a1, 48 // touch NUM_REGS-44 (x/x/20) + mov a12, a0 + _entry a1, 48 // touch NUM_REGS-56 (x/x/8) + mov a8, a0 +#endif +#endif + retw + + /* Called with call12: touch register NUM_REGS-16 (x/16/48) */ +.L12: +#if XCHAL_NUM_AREGS > 16 + call12 1f + retw + + .align 4 +1: _entry a1, 48 // touch NUM_REGS-28 (x/4/36) +#if XCHAL_NUM_AREGS == 32 + mov a4, a0 +#else + mov a12, a0 + _entry a1, 48 // touch NUM_REGS-40 (x/x/24) + mov a12, a0 + _entry a1, 48 // touch NUM_REGS-52 (x/x/12) + mov a12, a0 +#endif +#endif + retw -- cgit v1.2.3