projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| dbf4ed89 MF |
1 | /* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0 */ |
| 2 | #include <linux/linkage.h> | |
| 3 | #include <asm/asmmacro.h> | |
| 4 | #include <asm/core.h> | |
| 5 | ||
| 6 | ENTRY(__modsi3) | |
| 7 | ||
| 8 | abi_entry_default | |
| 9 | #if XCHAL_HAVE_DIV32 | |
| 10 | rems a2, a2, a3 | |
| 11 | #else | |
| 12 | mov a7, a2 /* save original (signed) dividend */ | |
| 13 | do_abs a2, a2, a4 /* udividend = abs (dividend) */ | |
| 14 | do_abs a3, a3, a4 /* udivisor = abs (divisor) */ | |
| 15 | bltui a3, 2, .Lle_one /* check if udivisor <= 1 */ | |
| 16 | do_nsau a5, a2, a6, a8 /* udividend_shift = nsau (udividend) */ | |
| 17 | do_nsau a4, a3, a6, a8 /* udivisor_shift = nsau (udivisor) */ | |
| 18 | bgeu a5, a4, .Lspecial | |
| 19 | ||
| 20 | sub a4, a4, a5 /* count = udivisor_shift - udividend_shift */ | |
| 21 | ssl a4 | |
| 22 | sll a3, a3 /* udivisor <<= count */ | |
| 23 | ||
| 24 | /* test-subtract-and-shift loop */ | |
| 25 | #if XCHAL_HAVE_LOOPS | |
| 26 | loopnez a4, .Lloopend | |
| 27 | #endif /* XCHAL_HAVE_LOOPS */ | |
| 28 | .Lloop: | |
| 29 | bltu a2, a3, .Lzerobit | |
| 30 | sub a2, a2, a3 | |
| 31 | .Lzerobit: | |
| 32 | srli a3, a3, 1 | |
| 33 | #if !XCHAL_HAVE_LOOPS | |
| 34 | addi a4, a4, -1 | |
| 35 | bnez a4, .Lloop | |
| 36 | #endif /* !XCHAL_HAVE_LOOPS */ | |
| 37 | .Lloopend: | |
| 38 | ||
| 39 | .Lspecial: | |
| 40 | bltu a2, a3, .Lreturn | |
| 41 | sub a2, a2, a3 /* subtract again if udividend >= udivisor */ | |
| 42 | .Lreturn: | |
| 43 | bgez a7, .Lpositive | |
| 44 | neg a2, a2 /* if (dividend < 0), return -udividend */ | |
| 45 | .Lpositive: | |
| 46 | abi_ret_default | |
| 47 | ||
| 48 | .Lle_one: | |
| 49 | bnez a3, .Lreturn0 | |
| 50 | ||
| 51 | /* Divide by zero: Use an illegal instruction to force an exception. | |
| 52 | The subsequent "DIV0" string can be recognized by the exception | |
| 53 | handler to identify the real cause of the exception. */ | |
| 54 | ill | |
| 55 | .ascii "DIV0" | |
| 56 | ||
| 57 | .Lreturn0: | |
| 58 | movi a2, 0 | |
| 59 | #endif /* XCHAL_HAVE_DIV32 */ | |
| 60 | abi_ret_default | |
| 61 | ||
| 62 | ENDPROC(__modsi3) | |
| 338d9150 | 63 | EXPORT_SYMBOL(__modsi3) |
| dbf4ed89 MF |
64 | |
| 65 | #if !XCHAL_HAVE_NSA | |
| 66 | .section .rodata | |
| 67 | .align 4 | |
| 68 | .global __nsau_data | |
| 69 | .type __nsau_data, @object | |
| 70 | __nsau_data: | |
| 71 | .byte 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4 | |
| 72 | .byte 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 | |
| 73 | .byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 | |
| 74 | .byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 | |
| 75 | .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 | |
| 76 | .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 | |
| 77 | .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 | |
| 78 | .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 | |
| 79 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 80 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 81 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 82 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 83 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 84 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 85 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 86 | .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
| 87 | .size __nsau_data, . - __nsau_data | |
| 88 | #endif /* !XCHAL_HAVE_NSA */ |