/* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0 */
#include <linux/linkage.h>
#include <asm/asmmacro.h>
#include <asm/core.h>
ENTRY(__modsi3)
abi_entry_default
#if XCHAL_HAVE_DIV32
rems a2, a2, a3
#else
mov a7, a2
/* save original (signed) dividend */
do_abs a2, a2, a4
/* udividend = abs (dividend) */
do_abs a3, a3, a4
/* udivisor = abs (divisor) */
bltui a3, 2, .Lle_one
/* check if udivisor <= 1 */
do_nsau a5, a2, a6, a8
/* udividend_shift = nsau (udividend) */
do_nsau a4, a3, a6, a8
/* udivisor_shift = nsau (udivisor) */
bgeu a5, a4, .Lspecial
sub a4, a4, a5
/* count = udivisor_shift - udividend_shift */
ssl a4
sll a3, a3
/* udivisor <<= count */
/* test-subtract-and-shift loop */
#if XCHAL_HAVE_LOOPS
loopnez a4, .Lloopend
#endif
/* XCHAL_HAVE_LOOPS */
.Lloop:
bltu a2, a3, .Lzerobit
sub a2, a2, a3
.Lzerobit:
srli a3, a3, 1
#if
!XCHAL_HAVE_LOOPS
addi a4, a4, -1
bnez a4, .Lloop
#endif
/* !XCHAL_HAVE_LOOPS */
.Lloopend:
.Lspecial:
bltu a2, a3, .Lreturn
sub a2, a2, a3
/* subtract again if udividend >= udivisor */
.Lreturn:
bgez a7, .Lpositive
neg a2, a2
/* if (dividend < 0), return -udividend */
.Lpositive:
abi_ret_default
.Lle_one:
bnez a3, .Lreturn0
/* Divide by zero: Use an illegal instruction to force an exception.
The subsequent "DIV0" string can be recognized by the exception
handler to identify the real cause of the exception. */
ill
.
ascii "DIV0"
.Lreturn0:
movi a2, 0
#endif
/* XCHAL_HAVE_DIV32 */
abi_ret_default
ENDPROC(__modsi3)
EXPORT_SYMBOL(__modsi3)
#if
!XCHAL_HAVE_NSA
.
section .rodata
.
align 4
.
global __nsau_data
.type __nsau_data, @object
__nsau_data:
.byte 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4
.byte 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
.byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
.byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
.byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
.byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
.byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
.byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
.
size __nsau_data, . - __nsau_data
#endif
/* !XCHAL_HAVE_NSA */
