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fp64_stackB.S
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fp64_stackB.S
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/* Copyright (c) 2020 Uwe Bissinger
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
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 OWNER 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. */
/* $Id$ */
#include "fp64def.h"
#include "asmdef.h"
/* stack manipulation routines for B register set */
FUNCTION __fp64_stack
/* __fp64_pushB() save B register set in stack
Does not rely on YL,YH being the frame pointer
Function must be called via rcall or call, cannot be a target of rjmp/jmp!
Input:
rB7.rB6.rB5.rB4.rB3.rB2.rB1.rB0 - B will be saved on stack
Return:
nothing
Modifies:
nothing - also SREG is preserved
*/
ENTRY __fp64_pushB
sts __fp64_saver01, r0 ; save r0 & r1
sts __fp64_saver01+1, r1
pop r0 ; get return address
pop r1
#if defined (ARDUINO_AVR_MEGA2560)
sts __fp64_saver01+2, r0
pop r0
#endif
ENTRY __fp64_pushB_int
push rB7 ; save B as it will be modified
push rB6
push rB5
push rB4
push rB3
push rB2
push rB1
push rB0
rjmp .L_ret
/* __fp64_popB() restore B register set
Does not rely on YL,YH being the frame pointer
Function must be called via rcall or call, cannot be a target of rjmp/jmp!
Input:
none
Return:
rB7.rB6.rB5.rB4.rB3.rB2.rB1.rB0 - B restored from stack, as originally pushed by __fp64_pushB
Modifies:
nothing - also SREG is preserved
*/
ENTRY __fp64_popB
;call __fp64_saveAB
sts __fp64_saver01, r0 ; save r0 & r1
sts __fp64_saver01+1, r1
pop r0 ; get return address
pop r1
#if defined (ARDUINO_AVR_MEGA2560)
sts __fp64_saver01+2, r0
pop r0
#endif
pop rB0 ; restore B
pop rB1
pop rB2
pop rB3
pop rB4
pop rB5
pop rB6
pop rB7
ENTRY __fp64_L_ret
.L_ret: ; restore return address, r0&r1 and return to caller
#if defined (ARDUINO_AVR_MEGA2560)
push r0
lds r0, __fp64_saver01+2
#endif
push r1 ; push return address back to stack
push r0
lds r1, __fp64_saver01+1 ; retore r0 & r1
lds r0, __fp64_saver01
ret
/* __fp64_popBret() restore B register set and return
Does not rely on YL,YH being the frame pointer
Function must jumped to via rjmp/jmp!
Input:
none
Return:
rB7.rB6.rB5.rB4.rB3.rB2.rB1.rB0 - B restored from stack, as originally pushed by __fp64_pushB
Modifies:
nothing - also SREG is preserved
*/
ENTRY __fp64_popBret
pop rB0 ; restore B
pop rB1
pop rB2
pop rB3
pop rB4
pop rB5
pop rB6
pop rB7
ret
ENDFUNC
.data
ENTRY __fp64_saver01
.skip 3