/* 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(__umodsi3)

        abi_entry_default
#if XCHAL_HAVE_DIV32
        remu    a2, a2, a3
#else
        bltui   a3, 2, .Lle_one /* check if the divisor is <= 1 */

        do_nsau a5, a2, a6, a7  /* dividend_shift = nsau (dividend) */
        do_nsau a4, a3, a6, a7  /* divisor_shift = nsau (divisor) */
        bgeu    a5, a4, .Lspecial

        sub     a4, a4, a5      /* count = divisor_shift - dividend_shift */
        ssl     a4
        sll     a3, a3          /* divisor <<= 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 once more if dividend >= divisor */
.Lreturn:
        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(__umodsi3)
EXPORT_SYMBOL(__umodsi3)