mirror of
https://github.com/espressif/esp-idf.git
synced 2025-11-04 17:11:45 +01:00
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
|
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
|
||
|
|
//
|
||
|
|
// 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 <stdlib.h>
|
||
|
|
#include "riscv/instruction_decode.h"
|
||
|
|
|
||
|
|
typedef union {
|
||
|
|
struct {
|
||
|
|
unsigned int opcode: 7;
|
||
|
|
unsigned int rd: 5;
|
||
|
|
int imm_19_12: 8;
|
||
|
|
int imm_11: 1;
|
||
|
|
int imm_10_1: 10;
|
||
|
|
int imm20: 1;
|
||
|
|
};
|
||
|
|
unsigned int inst;
|
||
|
|
} riscv_jal_intruction_t;
|
||
|
|
|
||
|
|
int riscv_decode_offset_from_jal_instruction(const intptr_t inst_addr)
|
||
|
|
{
|
||
|
|
riscv_jal_intruction_t *jal_inst = (riscv_jal_intruction_t *)inst_addr;
|
||
|
|
// check if it's a valid JAL instruction
|
||
|
|
if (jal_inst->opcode != 0x6f && jal_inst->rd != 0) {
|
||
|
|
abort();
|
||
|
|
}
|
||
|
|
return (jal_inst->imm_10_1 | jal_inst->imm_11 << 10 | jal_inst->imm_19_12 << 11 | jal_inst->imm20 << 19) << 1;
|
||
|
|
}
|