1dbf4ed89SMax Filippov/* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0 */ 2dbf4ed89SMax Filippov#include <linux/linkage.h> 3dbf4ed89SMax Filippov#include <asm/asmmacro.h> 4dbf4ed89SMax Filippov#include <asm/core.h> 5dbf4ed89SMax Filippov 6dbf4ed89SMax FilippovENTRY(__umodsi3) 7dbf4ed89SMax Filippov 8dbf4ed89SMax Filippov abi_entry_default 9dbf4ed89SMax Filippov#if XCHAL_HAVE_DIV32 10dbf4ed89SMax Filippov remu a2, a2, a3 11dbf4ed89SMax Filippov#else 12dbf4ed89SMax Filippov bltui a3, 2, .Lle_one /* check if the divisor is <= 1 */ 13dbf4ed89SMax Filippov 14dbf4ed89SMax Filippov do_nsau a5, a2, a6, a7 /* dividend_shift = nsau (dividend) */ 15dbf4ed89SMax Filippov do_nsau a4, a3, a6, a7 /* divisor_shift = nsau (divisor) */ 16dbf4ed89SMax Filippov bgeu a5, a4, .Lspecial 17dbf4ed89SMax Filippov 18dbf4ed89SMax Filippov sub a4, a4, a5 /* count = divisor_shift - dividend_shift */ 19dbf4ed89SMax Filippov ssl a4 20dbf4ed89SMax Filippov sll a3, a3 /* divisor <<= count */ 21dbf4ed89SMax Filippov 22dbf4ed89SMax Filippov /* test-subtract-and-shift loop */ 23dbf4ed89SMax Filippov#if XCHAL_HAVE_LOOPS 24dbf4ed89SMax Filippov loopnez a4, .Lloopend 25dbf4ed89SMax Filippov#endif /* XCHAL_HAVE_LOOPS */ 26dbf4ed89SMax Filippov.Lloop: 27dbf4ed89SMax Filippov bltu a2, a3, .Lzerobit 28dbf4ed89SMax Filippov sub a2, a2, a3 29dbf4ed89SMax Filippov.Lzerobit: 30dbf4ed89SMax Filippov srli a3, a3, 1 31dbf4ed89SMax Filippov#if !XCHAL_HAVE_LOOPS 32dbf4ed89SMax Filippov addi a4, a4, -1 33dbf4ed89SMax Filippov bnez a4, .Lloop 34dbf4ed89SMax Filippov#endif /* !XCHAL_HAVE_LOOPS */ 35dbf4ed89SMax Filippov.Lloopend: 36dbf4ed89SMax Filippov 37dbf4ed89SMax Filippov.Lspecial: 38dbf4ed89SMax Filippov bltu a2, a3, .Lreturn 39dbf4ed89SMax Filippov sub a2, a2, a3 /* subtract once more if dividend >= divisor */ 40dbf4ed89SMax Filippov.Lreturn: 41dbf4ed89SMax Filippov abi_ret_default 42dbf4ed89SMax Filippov 43dbf4ed89SMax Filippov.Lle_one: 44dbf4ed89SMax Filippov bnez a3, .Lreturn0 45dbf4ed89SMax Filippov 46dbf4ed89SMax Filippov /* Divide by zero: Use an illegal instruction to force an exception. 47dbf4ed89SMax Filippov The subsequent "DIV0" string can be recognized by the exception 48dbf4ed89SMax Filippov handler to identify the real cause of the exception. */ 49dbf4ed89SMax Filippov ill 50dbf4ed89SMax Filippov .ascii "DIV0" 51dbf4ed89SMax Filippov 52dbf4ed89SMax Filippov.Lreturn0: 53dbf4ed89SMax Filippov movi a2, 0 54dbf4ed89SMax Filippov#endif /* XCHAL_HAVE_DIV32 */ 55dbf4ed89SMax Filippov abi_ret_default 56dbf4ed89SMax Filippov 57dbf4ed89SMax FilippovENDPROC(__umodsi3) 58*338d9150SMax FilippovEXPORT_SYMBOL(__umodsi3) 59