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sp_sm2_armthumb.c
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/* sp.c
*
* Copyright (C) 2006-2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/* Implementation by Sean Parkinson. */
#include <wolfssl/wolfcrypt/libwolfssl_sources.h>
#if defined(WOLFSSL_HAVE_SP_RSA) || defined(WOLFSSL_HAVE_SP_DH) || \
defined(WOLFSSL_HAVE_SP_ECC)
#include <wolfssl/wolfcrypt/cpuid.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#ifdef RSA_LOW_MEM
#ifndef WOLFSSL_SP_SMALL
#define WOLFSSL_SP_SMALL
#endif
#endif
#if defined(WOLFSSL_SMALL_STACK) && !defined(WOLFSSL_SP_NO_MALLOC)
#undef WOLFSSL_SP_SMALL_STACK
#define WOLFSSL_SP_SMALL_STACK
#endif
#include <wolfssl/wolfcrypt/sp.h>
#ifdef __IAR_SYSTEMS_ICC__
#define __asm__ asm
#define __volatile__ volatile
#define WOLFSSL_NO_VAR_ASSIGN_REG
#endif /* __IAR_SYSTEMS_ICC__ */
#ifdef __KEIL__
#define __asm__ __asm
#define __volatile__ volatile
#endif
#ifdef WOLFSSL_SP_ARM_THUMB_ASM
#define SP_PRINT_NUM(var, name, total, words, bits) \
do { \
int ii; \
fprintf(stderr, name "=0x"); \
for (ii = (((bits) + 31) / 32) - 1; ii >= 0; ii--) \
fprintf(stderr, SP_PRINT_FMT, (var)[ii]); \
fprintf(stderr, "\n"); \
} while (0)
#define SP_PRINT_VAL(var, name) \
fprintf(stderr, name "=0x" SP_PRINT_FMT "\n", var)
#define SP_PRINT_INT(var, name) \
fprintf(stderr, name "=%d\n", var)
#ifdef WOLFSSL_HAVE_SP_ECC
#ifdef WOLFSSL_SP_SM2
/* Point structure to use. */
typedef struct sp_point_256 {
/* X ordinate of point. */
sp_digit x[2 * 8];
/* Y ordinate of point. */
sp_digit y[2 * 8];
/* Z ordinate of point. */
sp_digit z[2 * 8];
/* Indicates point is at infinity. */
int infinity;
} sp_point_256;
/* The modulus (prime) of the curve SM2 P256. */
static const sp_digit p256_sm2_mod[8] = {
0xffffffff,0xffffffff,0x00000000,0xffffffff,0xffffffff,0xffffffff,
0xffffffff,0xfffffffe
};
/* The Montgomery normalizer for modulus of the curve P256. */
static const sp_digit p256_sm2_norm_mod[8] = {
0x00000001,0x00000000,0xffffffff,0x00000000,0x00000000,0x00000000,
0x00000000,0x00000001
};
/* The Montgomery multiplier for modulus of the curve P256. */
static const sp_digit p256_sm2_mp_mod = 0x00000001;
#if defined(WOLFSSL_VALIDATE_ECC_KEYGEN) || defined(HAVE_ECC_SIGN) || \
defined(HAVE_ECC_VERIFY)
/* The order of the curve P256. */
static const sp_digit p256_sm2_order[8] = {
0x39d54123,0x53bbf409,0x21c6052b,0x7203df6b,0xffffffff,0xffffffff,
0xffffffff,0xfffffffe
};
#endif
/* The order of the curve P256 minus 2. */
static const sp_digit p256_sm2_order2[8] = {
0x39d54121,0x53bbf409,0x21c6052b,0x7203df6b,0xffffffff,0xffffffff,
0xffffffff,0xfffffffe
};
#if defined(HAVE_ECC_SIGN)
/* The Montgomery normalizer for order of the curve P256. */
static const sp_digit p256_sm2_norm_order[8] = {
0xc62abedd,0xac440bf6,0xde39fad4,0x8dfc2094,0x00000000,0x00000000,
0x00000000,0x00000001
};
#endif
#if defined(HAVE_ECC_SIGN)
/* The Montgomery multiplier for order of the curve P256. */
static const sp_digit p256_sm2_mp_order = 0x72350975;
#endif
/* The base point of curve P256. */
static const sp_point_256 p256_sm2_base = {
/* X ordinate */
{
0x334c74c7,0x715a4589,0xf2660be1,0x8fe30bbf,0x6a39c994,0x5f990446,
0x1f198119,0x32c4ae2c,
(sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0,
(sp_digit)0, (sp_digit)0, (sp_digit)0
},
/* Y ordinate */
{
0x2139f0a0,0x02df32e5,0xc62a4740,0xd0a9877c,0x6b692153,0x59bdcee3,
0xf4f6779c,0xbc3736a2,
(sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0,
(sp_digit)0, (sp_digit)0, (sp_digit)0
},
/* Z ordinate */
{
0x00000001,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,
0x00000000,0x00000000,
(sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0, (sp_digit)0,
(sp_digit)0, (sp_digit)0, (sp_digit)0
},
/* infinity */
0
};
#if defined(HAVE_ECC_CHECK_KEY) || defined(HAVE_COMP_KEY)
static const sp_digit p256_sm2_b[8] = {
0x4d940e93,0xddbcbd41,0x15ab8f92,0xf39789f5,0xcf6509a7,0x4d5a9e4b,
0x9d9f5e34,0x28e9fa9e
};
#endif
/* Multiply a and b into r. (r = a * b)
*
* r A single precision integer.
* a A single precision integer.
* b A single precision integer.
*/
SP_NOINLINE static void sp_256_mul_sm2_8(sp_digit* r, const sp_digit* a,
const sp_digit* b)
{
sp_digit t[8 * 2];
sp_digit* tmp = t;
__asm__ __volatile__ (
"movs r3, #0\n\t"
"movs r4, #0\n\t"
"mov r8, r3\n\t"
"mov r11, %[tmp]\n\t"
"mov r9, %[a]\n\t"
"mov r10, %[b]\n\t"
"movs r6, #32\n\t"
"add r6, r6, r9\n\t"
"mov r12, r6\n\t"
"\n"
"L_sp_256_mul_sm2_8_words_%=:\n\t"
"movs %[tmp], #0\n\t"
"movs r5, #0\n\t"
"movs r6, #28\n\t"
"mov %[a], r8\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs %[a], %[a], r6\n\t"
#else
"sub %[a], %[a], r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"sbcs r6, r6, r6\n\t"
#elif defined(__clang__)
"sbcs r6, r6\n\t"
#else
"sbc r6, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"mvns r6, r6\n\t"
#else
"mvn r6, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"ands %[a], %[a], r6\n\t"
#elif defined(__clang__)
"ands %[a], r6\n\t"
#else
"and %[a], r6\n\t"
#endif
"mov %[b], r8\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs %[b], %[b], %[a]\n\t"
#else
"sub %[b], %[b], %[a]\n\t"
#endif
"add %[a], %[a], r9\n\t"
"add %[b], %[b], r10\n\t"
"\n"
"L_sp_256_mul_sm2_8_mul_%=:\n\t"
"# Multiply Start\n\t"
"ldrh r6, [%[a]]\n\t"
"ldrh r7, [%[b]]\n\t"
#ifdef WOLFSSL_KEIL
"muls r7, r6, r7\n\t"
#elif defined(__clang__)
"muls r7, r6\n\t"
#else
"mul r7, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r7\n\t"
#else
"add r3, r3, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, %[tmp]\n\t"
#elif defined(__clang__)
"adcs r4, %[tmp]\n\t"
#else
"adc r4, %[tmp]\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[tmp]\n\t"
#elif defined(__clang__)
"adcs r5, %[tmp]\n\t"
#else
"adc r5, %[tmp]\n\t"
#endif
"ldr r7, [%[b]]\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r7, #16\n\t"
#else
"lsr r7, r7, #16\n\t"
#endif
#ifdef WOLFSSL_KEIL
"muls r6, r7, r6\n\t"
#elif defined(__clang__)
"muls r6, r7\n\t"
#else
"mul r6, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r6, #16\n\t"
#else
"lsr r7, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsls r6, r6, #16\n\t"
#else
"lsl r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[tmp]\n\t"
#elif defined(__clang__)
"adcs r5, %[tmp]\n\t"
#else
"adc r5, %[tmp]\n\t"
#endif
"ldr r6, [%[a]]\n\t"
"ldr r7, [%[b]]\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r6, r6, #16\n\t"
#else
"lsr r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r7, #16\n\t"
#else
"lsr r7, r7, #16\n\t"
#endif
#ifdef WOLFSSL_KEIL
"muls r7, r6, r7\n\t"
#elif defined(__clang__)
"muls r7, r6\n\t"
#else
"mul r7, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r4, r4, r7\n\t"
#else
"add r4, r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[tmp]\n\t"
#elif defined(__clang__)
"adcs r5, %[tmp]\n\t"
#else
"adc r5, %[tmp]\n\t"
#endif
"ldrh r7, [%[b]]\n\t"
#ifdef WOLFSSL_KEIL
"muls r6, r7, r6\n\t"
#elif defined(__clang__)
"muls r6, r7\n\t"
#else
"mul r6, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r6, #16\n\t"
#else
"lsr r7, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsls r6, r6, #16\n\t"
#else
"lsl r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[tmp]\n\t"
#elif defined(__clang__)
"adcs r5, %[tmp]\n\t"
#else
"adc r5, %[tmp]\n\t"
#endif
"# Multiply Done\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds %[a], %[a], #4\n\t"
#else
"add %[a], %[a], #4\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs %[b], %[b], #4\n\t"
#else
"sub %[b], %[b], #4\n\t"
#endif
"cmp %[a], r12\n\t"
"beq L_sp_256_mul_sm2_8_done_mul_%=\n\t"
"mov r6, r8\n\t"
"add r6, r6, r9\n\t"
"cmp %[a], r6\n\t"
"ble L_sp_256_mul_sm2_8_mul_%=\n\t"
"\n"
"L_sp_256_mul_sm2_8_done_mul_%=:\n\t"
"mov %[tmp], r11\n\t"
"mov r7, r8\n\t"
"str r3, [%[tmp], r7]\n\t"
"movs r3, r4\n\t"
"movs r4, r5\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r7, r7, #4\n\t"
#else
"add r7, r7, #4\n\t"
#endif
"mov r8, r7\n\t"
"movs r6, #56\n\t"
"cmp r7, r6\n\t"
"ble L_sp_256_mul_sm2_8_words_%=\n\t"
"str r3, [%[tmp], r7]\n\t"
"mov %[a], r9\n\t"
"mov %[b], r10\n\t"
: [a] "+l" (a), [b] "+l" (b), [tmp] "+l" (tmp)
:
: "memory", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cc"
);
XMEMCPY(r, t, sizeof(t));
}
/* Square a and put result in r. (r = a * a)
*
* r A single precision integer.
* a A single precision integer.
*/
SP_NOINLINE static void sp_256_sqr_sm2_8(sp_digit* r, const sp_digit* a)
{
__asm__ __volatile__ (
"movs r3, #0\n\t"
"movs r4, #0\n\t"
"movs r5, #0\n\t"
"mov r8, r3\n\t"
"mov r11, %[r]\n\t"
"movs r6, #0x40\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"negs r6, r6\n\t"
#else
"neg r6, r6\n\t"
#endif
"add sp, sp, r6\n\t"
"mov r10, sp\n\t"
"mov r9, %[a]\n\t"
"\n"
"L_sp_256_sqr_sm2_8_words_%=:\n\t"
"movs %[r], #0\n\t"
"movs r6, #28\n\t"
"mov %[a], r8\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs %[a], %[a], r6\n\t"
#else
"sub %[a], %[a], r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"sbcs r6, r6, r6\n\t"
#elif defined(__clang__)
"sbcs r6, r6\n\t"
#else
"sbc r6, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"mvns r6, r6\n\t"
#else
"mvn r6, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"ands %[a], %[a], r6\n\t"
#elif defined(__clang__)
"ands %[a], r6\n\t"
#else
"and %[a], r6\n\t"
#endif
"mov r2, r8\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs r2, r2, %[a]\n\t"
#else
"sub r2, r2, %[a]\n\t"
#endif
"add %[a], %[a], r9\n\t"
"add r2, r2, r9\n\t"
"\n"
"L_sp_256_sqr_sm2_8_mul_%=:\n\t"
"cmp r2, %[a]\n\t"
"beq L_sp_256_sqr_sm2_8_sqr_%=\n\t"
"# Multiply * 2: Start\n\t"
"ldrh r6, [%[a]]\n\t"
"ldrh r7, [r2]\n\t"
#ifdef WOLFSSL_KEIL
"muls r7, r6, r7\n\t"
#elif defined(__clang__)
"muls r7, r6\n\t"
#else
"mul r7, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r7\n\t"
#else
"add r3, r3, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, %[r]\n\t"
#elif defined(__clang__)
"adcs r4, %[r]\n\t"
#else
"adc r4, %[r]\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r7\n\t"
#else
"add r3, r3, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, %[r]\n\t"
#elif defined(__clang__)
"adcs r4, %[r]\n\t"
#else
"adc r4, %[r]\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
"ldr r7, [r2]\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r7, #16\n\t"
#else
"lsr r7, r7, #16\n\t"
#endif
#ifdef WOLFSSL_KEIL
"muls r6, r7, r6\n\t"
#elif defined(__clang__)
"muls r6, r7\n\t"
#else
"mul r6, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r6, #16\n\t"
#else
"lsr r7, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsls r6, r6, #16\n\t"
#else
"lsl r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
"ldr r6, [%[a]]\n\t"
"ldr r7, [r2]\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r6, r6, #16\n\t"
#else
"lsr r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r7, #16\n\t"
#else
"lsr r7, r7, #16\n\t"
#endif
#ifdef WOLFSSL_KEIL
"muls r7, r6, r7\n\t"
#elif defined(__clang__)
"muls r7, r6\n\t"
#else
"mul r7, r6\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r4, r4, r7\n\t"
#else
"add r4, r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r4, r4, r7\n\t"
#else
"add r4, r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
"ldrh r7, [r2]\n\t"
#ifdef WOLFSSL_KEIL
"muls r6, r7, r6\n\t"
#elif defined(__clang__)
"muls r6, r7\n\t"
#else
"mul r6, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r6, #16\n\t"
#else
"lsr r7, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsls r6, r6, #16\n\t"
#else
"lsl r6, r6, #16\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
"# Multiply * 2: Done\n\t"
"bal L_sp_256_sqr_sm2_8_done_sqr_%=\n\t"
"\n"
"L_sp_256_sqr_sm2_8_sqr_%=:\n\t"
"mov r12, r2\n\t"
"ldr r2, [%[a]]\n\t"
"# Square: Start\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r2, #16\n\t"
#else
"lsr r7, r2, #16\n\t"
#endif
"uxth r6, r2\n\t"
#ifdef WOLFSSL_KEIL
"muls r6, r6, r6\n\t"
#elif defined(__clang__)
"muls r6, r6\n\t"
#else
"mul r6, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"muls r7, r7, r7\n\t"
#elif defined(__clang__)
"muls r7, r7\n\t"
#else
"mul r7, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r2, #16\n\t"
#else
"lsr r7, r2, #16\n\t"
#endif
"uxth r6, r2\n\t"
#ifdef WOLFSSL_KEIL
"muls r6, r7, r6\n\t"
#elif defined(__clang__)
"muls r6, r7\n\t"
#else
"mul r6, r7\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsrs r7, r6, #15\n\t"
#else
"lsr r7, r6, #15\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"lsls r6, r6, #17\n\t"
#else
"lsl r6, r6, #17\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r6\n\t"
#else
"add r3, r3, r6\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r7\n\t"
#elif defined(__clang__)
"adcs r4, r7\n\t"
#else
"adc r4, r7\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r5, r5, %[r]\n\t"
#elif defined(__clang__)
"adcs r5, %[r]\n\t"
#else
"adc r5, %[r]\n\t"
#endif
"# Square: Done\n\t"
"mov r2, r12\n\t"
"\n"
"L_sp_256_sqr_sm2_8_done_sqr_%=:\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds %[a], %[a], #4\n\t"
#else
"add %[a], %[a], #4\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs r2, r2, #4\n\t"
#else
"sub r2, r2, #4\n\t"
#endif
"movs r6, #32\n\t"
"add r6, r6, r9\n\t"
"cmp %[a], r6\n\t"
"beq L_sp_256_sqr_sm2_8_done_mul_%=\n\t"
"cmp %[a], r2\n\t"
"bgt L_sp_256_sqr_sm2_8_done_mul_%=\n\t"
"mov r7, r8\n\t"
"add r7, r7, r9\n\t"
"cmp %[a], r7\n\t"
"ble L_sp_256_sqr_sm2_8_mul_%=\n\t"
"\n"
"L_sp_256_sqr_sm2_8_done_mul_%=:\n\t"
"mov %[r], r10\n\t"
"mov r7, r8\n\t"
"str r3, [%[r], r7]\n\t"
"movs r3, r4\n\t"
"movs r4, r5\n\t"
"movs r5, #0\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r7, r7, #4\n\t"
#else
"add r7, r7, #4\n\t"
#endif
"mov r8, r7\n\t"
"movs r6, #56\n\t"
"cmp r7, r6\n\t"
"ble L_sp_256_sqr_sm2_8_words_%=\n\t"
"mov %[a], r9\n\t"
"str r3, [%[r], r7]\n\t"
"mov %[r], r11\n\t"
"mov %[a], r10\n\t"
"movs r3, #60\n\t"
"\n"
"L_sp_256_sqr_sm2_8_store_%=:\n\t"
"ldr r6, [%[a], r3]\n\t"
"str r6, [%[r], r3]\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs r3, r3, #4\n\t"
#else
"sub r3, r3, #4\n\t"
#endif
"bge L_sp_256_sqr_sm2_8_store_%=\n\t"
"movs r6, #0x40\n\t"
"add sp, sp, r6\n\t"
: [r] "+l" (r), [a] "+l" (a)
:
: "memory", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cc"
);
}
#ifdef WOLFSSL_SP_SMALL
/* Add b to a into r. (r = a + b)
*
* r A single precision integer.
* a A single precision integer.
* b A single precision integer.
*/
SP_NOINLINE static sp_digit sp_256_add_sm2_8(sp_digit* r, const sp_digit* a,
const sp_digit* b)
{
__asm__ __volatile__ (
"movs r6, %[a]\n\t"
"movs r7, #0\n\t"
"movs r3, #0\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r6, r6, #32\n\t"
#else
"add r6, r6, #32\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"subs r7, r7, #1\n\t"
#else
"sub r7, r7, #1\n\t"
#endif
"\n"
"L_sp_256_add_sm2_8_word_%=:\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r7\n\t"
#else
"add r3, r3, r7\n\t"
#endif
"ldr r4, [%[a]]\n\t"
"ldr r5, [%[b]]\n\t"
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r5\n\t"
#elif defined(__clang__)
"adcs r4, r5\n\t"
#else
"adc r4, r5\n\t"
#endif
"str r4, [%[r]]\n\t"
"movs r3, #0\n\t"
#ifdef WOLFSSL_KEIL
"adcs r3, r3, r3\n\t"
#elif defined(__clang__)
"adcs r3, r3\n\t"
#else
"adc r3, r3\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds %[a], %[a], #4\n\t"
#else
"add %[a], %[a], #4\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds %[b], %[b], #4\n\t"
#else
"add %[b], %[b], #4\n\t"
#endif
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds %[r], %[r], #4\n\t"
#else
"add %[r], %[r], #4\n\t"
#endif
"cmp %[a], r6\n\t"
"bne L_sp_256_add_sm2_8_word_%=\n\t"
"movs %[r], r3\n\t"
: [r] "+l" (r), [a] "+l" (a), [b] "+l" (b)
:
: "memory", "r3", "r4", "r5", "r6", "r7", "cc"
);
return (word32)(size_t)r;
}
#else
/* Add b to a into r. (r = a + b)
*
* r A single precision integer.
* a A single precision integer.
* b A single precision integer.
*/
SP_NOINLINE static sp_digit sp_256_add_sm2_8(sp_digit* r, const sp_digit* a,
const sp_digit* b)
{
__asm__ __volatile__ (
"ldm %[b]!, {r5, r6}\n\t"
"ldm %[a]!, {r3, r4}\n\t"
#if defined(__clang__) || defined(WOLFSSL_KEIL)
"adds r3, r3, r5\n\t"
#else
"add r3, r3, r5\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r6\n\t"
#elif defined(__clang__)
"adcs r4, r6\n\t"
#else
"adc r4, r6\n\t"
#endif
"stm %[r]!, {r3, r4}\n\t"
"ldm %[b]!, {r5, r6}\n\t"
"ldm %[a]!, {r3, r4}\n\t"
#ifdef WOLFSSL_KEIL
"adcs r3, r3, r5\n\t"
#elif defined(__clang__)
"adcs r3, r5\n\t"
#else
"adc r3, r5\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r6\n\t"
#elif defined(__clang__)
"adcs r4, r6\n\t"
#else
"adc r4, r6\n\t"
#endif
"stm %[r]!, {r3, r4}\n\t"
"ldm %[b]!, {r5, r6}\n\t"
"ldm %[a]!, {r3, r4}\n\t"
#ifdef WOLFSSL_KEIL
"adcs r3, r3, r5\n\t"
#elif defined(__clang__)
"adcs r3, r5\n\t"
#else
"adc r3, r5\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r6\n\t"
#elif defined(__clang__)
"adcs r4, r6\n\t"
#else
"adc r4, r6\n\t"
#endif
"stm %[r]!, {r3, r4}\n\t"
"ldm %[b]!, {r5, r6}\n\t"
"ldm %[a]!, {r3, r4}\n\t"
#ifdef WOLFSSL_KEIL
"adcs r3, r3, r5\n\t"
#elif defined(__clang__)
"adcs r3, r5\n\t"
#else
"adc r3, r5\n\t"
#endif
#ifdef WOLFSSL_KEIL
"adcs r4, r4, r6\n\t"
#elif defined(__clang__)
"adcs r4, r6\n\t"
#else
"adc r4, r6\n\t"
#endif
"stm %[r]!, {r3, r4}\n\t"
"movs %[r], #0\n\t"
#ifdef WOLFSSL_KEIL
"adcs %[r], %[r], %[r]\n\t"
#elif defined(__clang__)
"adcs %[r], %[r]\n\t"
#else
"adc %[r], %[r]\n\t"
#endif
: [r] "+l" (r), [a] "+l" (a), [b] "+l" (b)
:
: "memory", "r3", "r4", "r5", "r6", "cc"
);
return (word32)(size_t)r;
}
#endif /* WOLFSSL_SP_SMALL */
#ifdef WOLFSSL_SP_SMALL
/* Sub b from a into a. (a -= b)
*
* a A single precision integer.
* b A single precision integer.
*/
SP_NOINLINE static sp_digit sp_256_sub_in_place_sm2_8(sp_digit* a,