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39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
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// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdlib.h>
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#include "riscv/instruction_decode.h"
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typedef union {
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struct {
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unsigned int opcode: 7;
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unsigned int rd: 5;
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int imm_19_12: 8;
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int imm_11: 1;
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int imm_10_1: 10;
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int imm20: 1;
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};
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unsigned int inst;
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} riscv_jal_intruction_t;
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int riscv_decode_offset_from_jal_instruction(const intptr_t inst_addr)
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{
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riscv_jal_intruction_t *jal_inst = (riscv_jal_intruction_t *)inst_addr;
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// check if it's a valid JAL instruction
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if (jal_inst->opcode != 0x6f && jal_inst->rd != 0) {
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abort();
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}
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return (jal_inst->imm_10_1 | jal_inst->imm_11 << 10 | jal_inst->imm_19_12 << 11 | jal_inst->imm20 << 19) << 1;
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}
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