| // Copyright 2024 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <cstdint> |
| |
| extern "C" { |
| void isr_wrapper(void); |
| __attribute__((naked)) void isr_wrapper(void) { |
| asm volatile( |
| "csrr t0, mepc \n" |
| "addi t0, t0, 4 \n" |
| "csrw mepc, t0 \n" |
| "csrr t0, mcause \n" |
| "li t1, 2 \n" |
| "beq t0, t1, 0f \n" |
| "csrr t0, mtval \n" |
| "la t1, 0x02007043 \n" |
| "beq t0, t1, 0f \n" |
| "ebreak \n" |
| "0: mpause \n" |
| ); |
| } |
| |
| } // extern "C" |
| |
| int main(int argc, char** argv) { |
| asm volatile("csrw mtvec, %0" :: "rK"((uint32_t)(&isr_wrapper))); |
| asm volatile(".word 0x02007043"); // fmadd.d f0, f0, f0, f0 |
| |
| return 0; |
| } |
