| 1 | /* |
| 2 | * Copyright (c) 2026 lowRISC CIC |
| 3 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 4 | */ |
| 5 | |
| 6 | #define crc32(op, rd, rs1) .insn r 19, 1, 48, rd, rs1, x##op |
| 7 | |
| 8 | #define crc32_b(rd, rs1) crc32(16, rd, rs1) |
| 9 | #define crc32_h(rd, rs1) crc32(17, rd, rs1) |
| 10 | #define crc32_w(rd, rs1) crc32(18, rd, rs1) |
| 11 | #define crc32_d(rd, rs1) crc32(19, rd, rs1) |
| 12 | #define crc32c_b(rd, rs1) crc32(24, rd, rs1) |
| 13 | #define crc32c_h(rd, rs1) crc32(25, rd, rs1) |
| 14 | #define crc32c_w(rd, rs1) crc32(26, rd, rs1) |
| 15 | #define crc32c_d(rd, rs1) crc32(27, rd, rs1) |
| 16 | |
| 17 | .option norvc |
| 18 | |
| 19 | .text |
| 20 | .globl _start |
| 21 | _start: |
| 22 | lla t0, trap |
| 23 | csrw mtvec, t0 |
| 24 | |
| 25 | li t0, 0x34e24a2cd65650d4 |
| 26 | |
| 27 | crc32_b (t0, t0) |
| 28 | crc32_h (t0, t0) |
| 29 | crc32_w (t0, t0) |
| 30 | crc32_d (t0, t0) |
| 31 | crc32c_b (t0, t0) |
| 32 | crc32c_h (t0, t0) |
| 33 | crc32c_w (t0, t0) |
| 34 | crc32c_d (t0, t0) |
| 35 | |
| 36 | li t1, 0x68167e78 |
| 37 | |
| 38 | li a0, 0 |
| 39 | beq t0, t1, _exit |
| 40 | fail: |
| 41 | li a0, 1 |
| 42 | _exit: |
| 43 | lla a1, semiargs |
| 44 | li t0, 0x20026 # ADP_Stopped_ApplicationExit |
| 45 | sd t0, 0(a1) |
| 46 | sd a0, 8(a1) |
| 47 | li a0, 0x20 # TARGET_SYS_EXIT_EXTENDED |
| 48 | |
| 49 | # Semihosting call sequence |
| 50 | .balign 16 |
| 51 | slli zero, zero, 0x1f |
| 52 | ebreak |
| 53 | srai zero, zero, 0x7 |
| 54 | j . |
| 55 | |
| 56 | .data |
| 57 | .balign 16 |
| 58 | semiargs: |
| 59 | .space 16 |
| 60 | |
| 61 | trap: |
| 62 | csrr t0, mepc |
| 63 | addi t0, t0, 4 |
| 64 | mret |