The Tor Browser: security/nss/lib/freebl/mpi/mpi

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 /* This inlined version is for 32-bit ARM platform only */

     7 #if !defined(__arm__)

     8 #error "This is for ARM only"

     9 #endif

    11 /* 16-bit thumb doesn't work inlined assember version */

    12 #if (!defined(__thumb__) || defined(__thumb2__)) && !defined(__ARM_ARCH_3__)

    14 #include "mpi-priv.h"

    16 #ifdef MP_ASSEMBLY_MULTIPLY

    17 void s_mpv_mul_d(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)

    18 {

    19   __asm__ __volatile__(

    20     "mov     r5, #0\n"

    21 #ifdef __thumb2__

    22     "cbz     %1, 2f\n"

    23 #else

    24     "cmp     %1, r5\n" /* r5 is 0 now */

    25     "beq     2f\n"

    26 #endif

    28     "1:\n"

    29     "mov     r4, #0\n"

    30     "ldr     r6, [%0], #4\n"

    31     "umlal   r5, r4, r6, %2\n"

    32     "str     r5, [%3], #4\n"

    33     "mov     r5, r4\n"

    35     "subs    %1, #1\n"

    36     "bne     1b\n"

    38     "2:\n"

    39     "str     r5, [%3]\n"

    40   :

    41   : "r"(a), "r"(a_len), "r"(b), "r"(c)

    42   : "memory", "cc", "%r4", "%r5", "%r6");

    43 }

    45 void s_mpv_mul_d_add(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)

    46 {

    47   __asm__ __volatile__(

    48     "mov     r5, #0\n"

    49 #ifdef __thumb2__

    50     "cbz     %1, 2f\n"

    51 #else

    52     "cmp     %1, r5\n" /* r5 is 0 now */

    53     "beq     2f\n"

    54 #endif

    56     "1:\n"

    57     "mov     r4, #0\n"

    58     "ldr     r6, [%3]\n"

    59     "adds    r5, r6\n"

    60     "adc     r4, r4, #0\n"

    62     "ldr     r6, [%0], #4\n"

    63     "umlal   r5, r4, r6, %2\n"

    64     "str     r5, [%3], #4\n"

    65     "mov     r5, r4\n"

    67     "subs    %1, #1\n"

    68     "bne     1b\n"

    70     "2:\n"

    71     "str     r5, [%3]\n"

    72     :

    73     : "r"(a), "r"(a_len), "r"(b), "r"(c)

    74     : "memory", "cc", "%r4", "%r5", "%r6");

    75 }

    77 void s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)

    78 {

    79   if (!a_len)

    80     return;

    82   __asm__ __volatile__(

    83     "mov     r5, #0\n"

    85     "1:\n"

    86     "mov     r4, #0\n"

    87     "ldr     r6, [%3]\n"

    88     "adds    r5, r6\n"

    89     "adc     r4, r4, #0\n"

    90     "ldr     r6, [%0], #4\n"

    91     "umlal   r5, r4, r6, %2\n"

    92     "str     r5, [%3], #4\n"

    93     "mov     r5, r4\n"

    95     "subs    %1, #1\n"

    96     "bne     1b\n"

    98 #ifdef __thumb2__

    99     "cbz     r4, 3f\n"

   100 #else

   101     "cmp     r4, #0\n"

   102     "beq     3f\n"

   103 #endif

   105     "2:\n"

   106     "mov     r4, #0\n"

   107     "ldr     r6, [%3]\n"

   108     "adds    r5, r6\n"

   109     "adc     r4, r4, #0\n"

   110     "str     r5, [%3], #4\n"

   111     "movs    r5, r4\n"

   112     "bne     2b\n"

   114     "3:\n"

   115     :

   116     : "r"(a), "r"(a_len), "r"(b), "r"(c)

   117     : "memory", "cc", "%r4", "%r5", "%r6");

   118 }

   119 #endif

   121 #ifdef MP_ASSEMBLY_SQUARE

   122 void s_mpv_sqr_add_prop(const mp_digit *pa, mp_size a_len, mp_digit *ps)

   123 {

   124   if (!a_len)

   125     return;

   127   __asm__ __volatile__(

   128     "mov     r3, #0\n"

   130     "1:\n"

   131     "mov     r4, #0\n"

   132     "ldr     r6, [%0], #4\n"

   133     "ldr     r5, [%2]\n"

   134     "adds    r3, r5\n"

   135     "adc     r4, r4, #0\n"

   136     "umlal   r3, r4, r6, r6\n" /* w = r3:r4 */

   137     "str     r3, [%2], #4\n"

   139     "ldr     r5, [%2]\n"

   140     "adds    r3, r4, r5\n"

   141     "mov     r4, #0\n"

   142     "adc     r4, r4, #0\n"

   143     "str     r3, [%2], #4\n"

   144     "mov     r3, r4\n"

   146     "subs    %1, #1\n"

   147     "bne     1b\n"

   149 #ifdef __thumb2__

   150     "cbz     r3, 3f\n"

   151 #else

   152     "cmp     r3, #0\n"

   153     "beq     3f\n"

   154 #endif

   156     "2:\n"

   157     "mov     r4, #0\n"

   158     "ldr     r5, [%2]\n"

   159     "adds    r3, r5\n"

   160     "adc     r4, r4, #0\n"

   161     "str     r3, [%2], #4\n"

   162     "movs    r3, r4\n"

   163     "bne     2b\n"

   165     "3:"

   166     :

   167     : "r"(pa), "r"(a_len), "r"(ps)

   168     : "memory", "cc", "%r3", "%r4", "%r5", "%r6");

   169 }

   170 #endif

   171 #endif

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