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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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175
security/nss/lib/freebl/mpi/mpi_arm.c Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* This inlined version is for 32-bit ARM platform only */
#if !defined(__arm__)
#error "This is for ARM only"
#endif
/* 16-bit thumb doesn't work inlined assember version */
#if (!defined(__thumb__) || defined(__thumb2__)) && !defined(__ARM_ARCH_3__)
#include "mpi-priv.h"
#ifdef MP_ASSEMBLY_MULTIPLY
void
s_mpv_mul_d(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
{
__asm__ __volatile__(
"mov r5, #0\n"
#ifdef __thumb2__
"cbz %1, 2f\n"
#else
"cmp %1, r5\n" /* r5 is 0 now */
"beq 2f\n"
#endif
"1:\n"
"mov r4, #0\n"
"ldr r6, [%0], #4\n"
"umlal r5, r4, r6, %2\n"
"str r5, [%3], #4\n"
"mov r5, r4\n"
"subs %1, #1\n"
"bne 1b\n"
"2:\n"
"str r5, [%3]\n"
:
: "r"(a), "r"(a_len), "r"(b), "r"(c)
: "memory", "cc", "%r4", "%r5", "%r6");
}
void
s_mpv_mul_d_add(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
{
__asm__ __volatile__(
"mov r5, #0\n"
#ifdef __thumb2__
"cbz %1, 2f\n"
#else
"cmp %1, r5\n" /* r5 is 0 now */
"beq 2f\n"
#endif
"1:\n"
"mov r4, #0\n"
"ldr r6, [%3]\n"
"adds r5, r6\n"
"adc r4, r4, #0\n"
"ldr r6, [%0], #4\n"
"umlal r5, r4, r6, %2\n"
"str r5, [%3], #4\n"
"mov r5, r4\n"
"subs %1, #1\n"
"bne 1b\n"
"2:\n"
"str r5, [%3]\n"
:
: "r"(a), "r"(a_len), "r"(b), "r"(c)
: "memory", "cc", "%r4", "%r5", "%r6");
}
void
s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
{
if (!a_len)
return;
__asm__ __volatile__(
"mov r5, #0\n"
"1:\n"
"mov r4, #0\n"
"ldr r6, [%3]\n"
"adds r5, r6\n"
"adc r4, r4, #0\n"
"ldr r6, [%0], #4\n"
"umlal r5, r4, r6, %2\n"
"str r5, [%3], #4\n"
"mov r5, r4\n"
"subs %1, #1\n"
"bne 1b\n"
#ifdef __thumb2__
"cbz r4, 3f\n"
#else
"cmp r4, #0\n"
"beq 3f\n"
#endif
"2:\n"
"mov r4, #0\n"
"ldr r6, [%3]\n"
"adds r5, r6\n"
"adc r4, r4, #0\n"
"str r5, [%3], #4\n"
"movs r5, r4\n"
"bne 2b\n"
"3:\n"
:
: "r"(a), "r"(a_len), "r"(b), "r"(c)
: "memory", "cc", "%r4", "%r5", "%r6");
}
#endif
#ifdef MP_ASSEMBLY_SQUARE
void
s_mpv_sqr_add_prop(const mp_digit *pa, mp_size a_len, mp_digit *ps)
{
if (!a_len)
return;
__asm__ __volatile__(
"mov r3, #0\n"
"1:\n"
"mov r4, #0\n"
"ldr r6, [%0], #4\n"
"ldr r5, [%2]\n"
"adds r3, r5\n"
"adc r4, r4, #0\n"
"umlal r3, r4, r6, r6\n" /* w = r3:r4 */
"str r3, [%2], #4\n"
"ldr r5, [%2]\n"
"adds r3, r4, r5\n"
"mov r4, #0\n"
"adc r4, r4, #0\n"
"str r3, [%2], #4\n"
"mov r3, r4\n"
"subs %1, #1\n"
"bne 1b\n"
#ifdef __thumb2__
"cbz r3, 3f\n"
#else
"cmp r3, #0\n"
"beq 3f\n"
#endif
"2:\n"
"mov r4, #0\n"
"ldr r5, [%2]\n"
"adds r3, r5\n"
"adc r4, r4, #0\n"
"str r3, [%2], #4\n"
"movs r3, r4\n"
"bne 2b\n"
"3:"
:
: "r"(pa), "r"(a_len), "r"(ps)
: "memory", "cc", "%r3", "%r4", "%r5", "%r6");
}
#endif
#endif