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/*
* Copyright (c) 2015, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
.altmacro
/*
* This helper macro concatenates instr_prefix, instr_suffix, to
* create a ldp/stp instruction. It also selects register name x/w
* based on reg_bytes.
*/
.macro __do_dregs instr_prefix, instr_suffix, reg_bytes, base_reg, \
base_offs, reg0, reg1
.if \reg_bytes == 8
\instr_prefix\instr_suffix \
x\reg0, x\reg1, [\base_reg, #\base_offs]
.else
\instr_prefix\instr_suffix \
w\reg0, w\reg1, [\base_reg, #\base_offs]
.endif
.endm
/*
* This helper macro concatenates instr_prefix, instr_suffix, to
* create a ldr/str instruction. It also selects register name x/w
* based on reg_bytes.
*/
.macro __do_reg instr_prefix, instr_suffix, reg_bytes, base_reg, \
base_offs, reg
.if \reg_bytes == 8
\instr_prefix\instr_suffix \
x\reg, [\base_reg, #\base_offs]
.else
\instr_prefix\instr_suffix \
w\reg, [\base_reg, #\base_offs]
.endif
.endm
/*
* This helper macro uses recursion to create a loop which will
* start with generating instructions for register pairs and if
* it's an odd number of registers end with a single load/store.
*/
.macro _do_regs instr_prefix, reg_bytes, base_reg, base_offs, \
from_regnum, to_regnum
.if (\to_regnum - \from_regnum + 1) >= 2
__do_dregs \instr_prefix, p, \reg_bytes, \base_reg, \
\base_offs, \from_regnum, %(\from_regnum + 1)
.else
__do_reg \instr_prefix, r, \reg_bytes, \base_reg, \
\base_offs, \from_regnum
.endif
.if (\to_regnum - \from_regnum + 1) > 2
_do_regs \instr_prefix, \reg_bytes, \base_reg, \
%(\base_offs + 2 * \reg_bytes), \
%(\from_regnum + 2), \to_regnum
.endif
.endm
/*
* Stores registers x[from_regnum]..x[to_regnum] at
* [base_reg, #base_offs]
*/
.macro store_xregs base_reg, base_offs, from_regnum, to_regnum
_do_regs st 8 \base_reg, \base_offs, \from_regnum, \to_regnum
.endm
/*
* Stores registers w[from_regnum]..w[to_regnum] at
* [base_reg, #base_offs]
*/
.macro store_wregs base_reg, base_offs, from_regnum, to_regnum
_do_regs st 4 \base_reg, \base_offs, \from_regnum, \to_regnum
.endm
/*
* Loads registers x[from_regnum]..x[to_regnum] at
* [base_reg, #base_offs]
*/
.macro load_xregs base_reg, base_offs, from_regnum, to_regnum
_do_regs ld 8 \base_reg, \base_offs, \from_regnum, \to_regnum
.endm
/*
* Loads registers w[from_regnum]..w[to_regnum] at
* [base_reg, #base_offs]
*/
.macro load_wregs base_reg, base_offs, from_regnum, to_regnum
_do_regs ld 4 \base_reg, \base_offs, \from_regnum, \to_regnum
.endm
/* Push register pair on stack */
.macro push, r1, r2
stp \r1, \r2, [sp, #-16]!
.endm
/* Pop register pair from stack */
.macro pop, r1, r2
ldp \r1, \r2, [sp], #16
.endm
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