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/*
* mp32opt.arm.S
*
* Assembler optimized multiprecision integer routines for ARM processors
*
* Compile target is GNU Assembler
*
* Copyright (c) 2001 Virtual Unlimited B.V.
*
* Author: Bob Deblier <bob@virtualunlimited.com>
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "beecrypt.gas.h"
.file "mp32opt.arm.S"
.text
/* ARM uses up to four registers for parameter passing */
#if 0
C_FUNCTION_BEGIN(mp32addw)
LABEL(mp32addw)
/* r0 is xsize and must be at least one, r1 = xdata, r2 = y */
stmfd sp!, {r4, lr}
add r1, r1, r0, asl #2
mov r3, #0
.Lmp32addw_loop:
ldr r4, [r1, #-4]
adds r4, r4, r2
adc r2, r3, r3
str r4, [r1, #-4]!
subs r0, r0, #1
bne .Lmp32addw_loop
mov r0, r2
ldmfd sp!, {r4, pc}
C_FUNCTION_END(mp32addw, .Lmp32addw_size)
C_FUNCTION_BEGIN(mp32subw)
LABEL(mp32subw)
/* r0 is xsize and must be at least one, r1 = xdata, r2 = y */
stmfd sp!, {r4, lr}
add r1, r1, r0, asl #2
mov r3, #0
.Lmp32subw_loop:
ldr r4, [r1, #-4]
subs r4, r4, r2
adc r2, r3, r3
str r4, [r1, #-4]!
subs r0, r0, #1
bne .Lmp32subw_loop
mov r0, r2
ldmfd sp!, {r4, pc}
C_FUNCTION_END(mp32subw, .Lmp32subw_size)
C_FUNCTION_BEGIN(mp32add)
LABEL(mp32add)
/* r0 is size, r1 = xdata, r2 = ydata */
stmfd sp!, {r4, r5, lr}
/* copy cpsr to r5 and clear the carry bit */
mrs r5, cpsr
bic r5, r5, #0x20000000
/* adjust the addresses */
add r1, r1, r0, asl #2
add r2, r2, r0, asl #2
.Lmp32add_loop:
/* restore the carry bit */
msr cpsr_c, r5
ldr r3, [r1, #-4]!
ldr r4, [r2, #-4]!
adcs r3, r3, r2
str r3, [r1, #0]
/* save the carry bit */
mrs r5, cpsr
subs r0, r0, #1
bne .Lmp32add_loop
/* restore the carry bit */
msr cpsr_c, r5
/* set the result to the proper value */
adc r0, r0, r0
ldmfd sp!, {r4, r5, pc}
C_FUNCTION_END(mp32add, .Lmp32add_size)
#endif
C_FUNCTION_BEGIN(mp32setmul)
stmfd sp!, {r4, r5, lr}
/* adjust the addresses */
add r1, r1, r0, asl #2
add r2, r2, r0, asl #2
/* r3 is the multiplicand; r4 load from memory, r5 is scratch, ip is carry */
mov ip, #0
.Lmp32setmul_loop:
ldr r4, [r2, #-4]!
mov r5, #0
umlal ip, r5, r3, r4
str ip, [r1, #-4]!
mov ip, r5
subs r0, r0, #1
bne .Lmp32setmul_loop
/* return carry */
mov r0, ip
ldmfd sp!, {r4, r5, pc}
C_FUNCTION_END(mp32setmul, .Lmp32setmul_size)
C_FUNCTION_BEGIN(mp32addmul)
stmfd sp!, {r4, r5, r6, lr}
/* adjust the addresses */
add r1, r1, r0, asl #2
add r2, r2, r0, asl #2
/* r3 is the multiplicand; r4 & r5 load from memory, r6 is scratch, ip is carry */
mov ip, #0
.Lmp32addmul_loop:
ldr r4, [r2, #-4]!
ldr r5, [r1, #-4]
mov r6, #0
umlal ip, r6, r3, r4
adds r5, r5, ip
adc ip, r6, #0
str r5, [r1, #-4]!
subs r0, r0, #1
bne .Lmp32addmul_loop
/* return carry */
mov r0, ip
ldmfd sp!, {r4, r5, r6, pc}
C_FUNCTION_END(mp32addmul, .Lmp32addmul_size)
#if 0
/* this routine needs fixing; it causes a core dump for some reason */
/* unfortunately the system I test this on has no debugger */
C_FUNCTION_BEGIN(mp32addsqrtrc)
stmfd sp!, {r4, r5, r6, lr}
/* adjust the addresses */
add r1, r1, r0, asl #2
add r2, r2, r0, asl #2
/* r3 is a zero register, ip is the carry */
mov r3, #0
mov ip, #0
.Lmp32addsqrtrc_loop:
ldr r4, [r2, #-4]!
mov r6, #0
umlal ip, r6, r4, r4
ldr r5, [r1, #-4] /* lo word */
ldr r4, [r1, #-8] /* hi word */
adds r5, r5, ip
adcs r4, r4, r6
str r5, [r1, #-4]
str r4, [r1, #-8]!
adc ip, r3, #0 /* set carry */
subs r0, r0, #1
bne .Lmp32addsqrtrc_loop
/* return carry */
mov r0, ip
ldmfd sp!, {r4, r5, r6, pc}
C_FUNCTION_END(mp32addsqrtrc, .Lmp32addsqrtrc_size)
#endif
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