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- /* 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)
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