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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1371" y="554">S6</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1391" y="574">S7</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1411" y="594">S8</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1431" y="614">S9</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1451" y="634">S10</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="534">A5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="554">A6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="574">A7</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="594">A8</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="614">A9</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="974" y="634">A10</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="974" y="654">A11</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="974" y="674">A12</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="454">D1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="474">D2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="494">D3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="534">D5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="554">D6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="574">D7</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="594">D8</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1028" y="614">D9</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="784">^EN</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="1634">A0</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="964" y="1654">A1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="974" y="1854">A11</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="974" y="1874">A12</text>
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4mux1.dlsche 0 → 100644
浏览文件 @ 348288ca
添加文件
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浏览文件 @ 348288ca
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="469" y="2054">C1</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="469" y="2074">C2</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="469" y="2094">C3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="962" y="2154">A6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1026" y="2134">D5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1026" y="2154">D6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="962" y="2764">A9</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="972" y="2784">A10</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="972" y="2824">A12</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1026" y="2684">D5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1026" y="2764">D9</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1026" y="2844">D13</text>
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8signto16.dlsche.svg 0 → 100644
浏览文件 @ 348288ca
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="488" y="424">Instr4</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="488" y="444">Instr5</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="488" y="464">Instr6</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="488" y="484">Instr7</text>
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="384">imm2</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="404">imm3</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="424">imm4</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="444">imm5</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="464">imm6</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="484">imm7</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="504">imm8</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="524">imm9</text>
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="564">imm11</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="15" font-weight="400" text-anchor="start" x="1158" y="584">imm12</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="18" y="844">低电平，无符号扩展</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="90" font-weight="700" text-anchor="start" x="558" y="124">数据位扩展模块</text>
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# 说明
16 位 MIPS 多周期微处理器
# 原理图
![raw svg](MIPS.dlsche.svg)
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<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<project id="73bfb951-3609-4a62-8c77-b373026f1088" name="mips-multi-cycle" version="1">
<files>
<filefolder id="c0a181af-d67c-4dd0-9275-aa277475c77c" name="子模块">
<file relativepath="2mux1.dlsche"/>
<file relativepath="4mux1.dlsche"/>
<file relativepath="alu.dlsche"/>
<file relativepath="regdst_mux.dlsche"/>
<file relativepath="al.dlsche"/>
<file relativepath="8signto16.dlsche"/>
<file relativepath="reg.dlsche"/>
<file relativepath="fsm.dlsche"/>
<file relativepath="multi_mux.dlsche"/>
</filefolder>
<filefolder id="2156f6c8-84d5-409f-859c-fddce752753a" name="存储器映射文件">
<file relativepath="ram.rxm"/>
</filefolder>
<filefolder id="3463ada9-1cc7-4838-ab12-f98af0a12bf2" name="源程序文件">
<file relativepath="ram.asm"/>
<file relativepath="ram.bat"/>
</filefolder>
<file relativepath="MIPS.dlsche"/>
<file relativepath="README.md"/>
</files>
</project>
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/*******************************************************************************
*******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
typedef unsigned char BYTE;
typedef long BOOL;
#define FALSE 0
#define TRUE 1
#define MAX_LINE_LENGTH 256 // 一行代码最多可以有多少个字符
#define MAX_LINE_COUNT 1024 // 源代码文件最多可以有多少行
#define MAX_SYMBOL_LENGTH 64 // 一个符号最多可以包含多少个字符
#define MAX_SYMBOL_COUNT 256 // 源代码文件中最多可以包含多少个符号
#define MAX_INSTR_KEY_WORD_LENGTH 32 // 一个指令关键字最多可以包含多少个字符
#ifndef MAX_PATH
#define MAX_PATH 256 // 文件路径最多可以包含多少个字符
#endif
// 代码行数据库。记录源代码文件中所有代码行的信息（包括注释行、空行）
struct LINE_RECORD
{
char line_string[MAX_LINE_LENGTH]; // 代码行的内容
unsigned long line_num; // 行号
unsigned long address; // 此行代码转换的机器码在映像文件中的地址（偏移）
int machine_code_count; // 此行代码转换的机器码的字节数量
unsigned long flag; // 代码行标志位，32位
};
struct LINE_RECORD line_database[MAX_LINE_COUNT] = {0};
int line_count = 0;
int machine_code_line_count = 0; // 记录产生了机器码的代码行的数量
// 在此定义所有的代码行标志位。注意，代码行标志位是按位或的关系。
#define LF_INSTRUCTION 0x00000001 // 代码行标志位的最低位是1，表示此行是一条指令，否则表示此行是数据
// 重定位表。如果指令中使用了标号、变量名等符号，在第一次扫描时无法确定他们的地址，需要
// 在第二次扫描时进行重定位。
struct REALLOCATE
{
unsigned long address; // 第一次扫描时，在这里记录了需要重定位的机器码的地址（偏移），
// 第二次扫描时，根据符号的地址进行重定位。
char symbol_name[MAX_SYMBOL_LENGTH]; // 需要重定位的符号名称。
int line_num; // 行号。
char instr_key_word[MAX_INSTR_KEY_WORD_LENGTH]; // 指令关键字
};
struct REALLOCATE reallocate_table[MAX_LINE_COUNT] = {0};
int reallocate_count = 0;
// 符号表。符号包括源代码中的标号、变量名。
struct SYMBOL
{
char name[MAX_SYMBOL_LENGTH]; // 符号名称
unsigned long address; // 符号表示的地址。重定位时需要用到。
int machine_code_count; // 符号生成的机器码的数量（以字节为单位）。
int line_num; // 行号
int ref_count; // 引用计数
};
struct SYMBOL symbol_table[MAX_SYMBOL_COUNT] = {0};
int symbol_count = 0;
// 汇编过程的状态
enum
{
AS_BEGIN // 起始状态。在遇到代码段名称前，处于此状态
,AS_TEXT // 正在处理代码段。遇到代码段名称后，遇到数据的名称前，处于此状态
,AS_DATA // 正在处理数据段。遇到数据段名称后，处于此状态
};
unsigned long assembler_state = AS_BEGIN;
//
// 在下面定义所有的关键字
//
// 段名称
const char* code_section_keyword = ".text"; // 代码段标志
char const* data_section_keyword = ".data"; // 数据段标志
// 指令名称
// R型指令
const char* or_instruction_keyword = "or";
const char* and_instruction_keyword = "and";
const char* add_instruction_keyword = "add";
const char* sub_instruction_keyword = "sub";
const char* sllv_instruction_keyword = "sllv";
const char* srlv_instruction_keyword = "srlv";
const char* srav_instruction_keyword = "srav";
const char* slt_instruction_keyword = "slt";
const char* jr_instruction_keyword = "jr"; // jr rs 跳转寄存器，PC=[rs]
const char* jalr_instruction_keyword = "jalr"; // jalr rs 跳转和链接寄存器，$ra = PC+2，PC=[rs]
const char* sll_instruction_keyword = "sll";
const char* srl_instruction_keyword = "srl";
const char* sra_instruction_keyword = "sra";
const char* xor_instruction_keyword = "xor";
const char* nor_instruction_keyword = "nor";
// I型指令
const char* ori_instruction_keyword = "ori";
const char* andi_instruction_keyword = "andi";
const char* addi_instruction_keyword = "addi";
const char* lw_instruction_keyword = "lw";
const char* sw_instruction_keyword = "sw";
const char* beq_instruction_keyword = "beq";
const char* bne_instruction_keyword = "bne";
const char* bgt_instruction_keyword = "bgt";
const char* bltz_instruction_keyword = "bltz";// bltz rs, lable 如果rs小于0则转移
const char* bgez_instruction_keyword = "bgez";// bgez rs, lable 如果rs大于或等于0则转移
// J型指令
const char* jump_instruction_keyword = "jump";
const char* jal_instruction_keyword = "jal"; // jal lable 跳转并链接，$ra = PC+2,PC=跳转目标地址
// 通用寄存器名称
const char* r0_register_keyword = "$r0";
const char* r1_register_keyword = "$r1";
const char* r2_register_keyword = "$r2";
const char* r3_register_keyword = "$r3";
const char* ra_register_keyword = "$ra"; // 返回地址寄存器
const char* t0_register_keyword = "$t0"; // 常数0寄存器
const char* delimit_char = "\n\t\r "; // 需要忽略的空白字符
const char* delimit_char_comma = "\n\t\r, "; // 需要忽略的空白字符，包括英文逗号
// 汇编产生的机器码
#define MAX_MACHINE_CODE 1024
BYTE machine_code[MAX_MACHINE_CODE];
unsigned long machine_code_address = 0;
unsigned long machine_code_old_address = 0;
const char* assembly_file_name = NULL; // 汇编文件路径
const char* target_file_name = NULL; // 目标文件路径
const char* list_file_name = NULL; // 列表文件路径
const char* dbg_file_name = NULL; // 调试信息文件路径
const unsigned long dbg_file_magic = 58;
const unsigned long dbg_file_version = 1;
// 输出汇编过程中发现的语法错误信息
void error_msg(const char* error_msg, int line_num)
{
if(line_num >= 1)
{
printf("%s:%d: error: %s\n", assembly_file_name, line_num, error_msg);
}
else
{
printf("%s: error: %s\n", assembly_file_name, error_msg);
}
exit(1);
}
char formated_msg[1024]; // 将格式化后的错误信息放在此字符串中。
void error_msg_warning_instr(const char* instruction_name, int line_num)
{
sprintf(formated_msg, "%s 指令在微处理器还没有实现，不能正确执行。", instruction_name);
error_msg(formated_msg, line_num);
}
void error_msg_miss_op(const char* instruction_name, int line_num)
{
sprintf(formated_msg, "%s 指令缺少操作数。", instruction_name);
error_msg(formated_msg, line_num);
}
void error_msg_wrong_op(const char* instruction_name, int line_num)
{
sprintf(formated_msg, "%s 指令不支持这样的操作数。", instruction_name);
error_msg(formated_msg, line_num);
}
void error_msg_same_symbol(const char* symbol, int line_num, int ref_line_num)
{
sprintf(formated_msg, "符号 %s 重复定义。参见第 %d 行。", symbol, ref_line_num);
error_msg(formated_msg, line_num);
}
void error_msg_keyword_symbol(const char* symbol, int line_num)
{
sprintf(formated_msg, "不能使用保留的关键字 %s 作为符号名称。", symbol);
error_msg(formated_msg, line_num);
}
void error_msg_wrong_data(const char* data, int line_num)
{
sprintf(formated_msg, "%s 不是有效的数据。", data);
error_msg(formated_msg, line_num);
}
// 输出汇编过程中发现的警告信息
void warning_msg(const char* warning_msg, int line_num)
{
if(line_num >= 1)
{
printf("%s:%d: warning: %s\n", assembly_file_name, line_num, warning_msg);
}
else
{
printf("%s: warning: %s\n", assembly_file_name, warning_msg);
}
}
void warning_msg_invalid_line(int line_num)
{
warning_msg("忽略无效的代码行。", line_num);
}
void warning_msg_unref_symbol(const char* symbol, int line_num)
{
sprintf(formated_msg, "符号 %s 未被引用。", symbol);
warning_msg(formated_msg, line_num);
}
// 判断是否是立即数。如果是数字开头，或者是负号开头的，就认为是立即数。
int is_immediate(const char* token)
{
return (isdigit(token[0]) || '-' == token[0]) ? 1 : 0;
}
// 指令操作数类型
enum
{
OT_REGISTER_R0 // $r0
,OT_REGISTER_R1 // $r1
,OT_REGISTER_R2 // $r2
,OT_REGISTER_R3 // $r3
,OT_IMMEDIATE // 立即数
,OT_SYMBOL // 符号
};
// 得到指令操作数的类型
unsigned long get_operand_type(const char* op)
{
unsigned long op_type;
if(stricmp(op, r0_register_keyword) == 0)
{
op_type = OT_REGISTER_R0;
}
else if(stricmp(op, r1_register_keyword) == 0)
{
op_type = OT_REGISTER_R1;
}
else if(stricmp(op, r2_register_keyword) == 0)
{
op_type = OT_REGISTER_R2;
}
else if(stricmp(op, r3_register_keyword) == 0)
{
op_type = OT_REGISTER_R3;
}
else if(is_immediate(op))
{
op_type = OT_IMMEDIATE;
}
else
{
op_type = OT_SYMBOL;
}
return op_type;
}
// 根据 r? 寄存器，得到一个机器码
char get_machine_code_from_r(unsigned long op_type)
{
return (char)(op_type - OT_REGISTER_R0);
}
// 根据立即数得到一个机器码。注意，允许使用负数，所以返回值是带符号的 8 位 char。
char get_machine_code_from_immediate(const char* immediate)
{
char* end;
int start_index = (immediate[0] == '-' ? 1 : 0);
int base = (immediate[start_index] == '0' && (immediate[start_index + 1] == 'x' || immediate[start_index + 1] == 'X')) ? 16 : 10;
return (char)strtol(immediate, &end, base);
}
// 向重定位表中添加一个重定位信息
void add_reallocate(const char* symbol, int line_num, const char* instr_key_word)
{
reallocate_table[reallocate_count].address = machine_code_address;
strcpy(reallocate_table[reallocate_count].symbol_name, symbol);
strcpy(reallocate_table[reallocate_count].instr_key_word, instr_key_word);
reallocate_table[reallocate_count].line_num = line_num;
reallocate_count++;
}
// 判断一个操作数是否是lw或sw指令的第二个操作数类型，立即数表示地址偏移，可正可负
int is_lw_sw_instr_operand(const char* op)
{
int i;
// 最后一个字符必须是后括号
if (op[strlen(op) - 1] != ')')
{
return 0;
}
// 倒数第二个字符必须是0,1,2,3
if (op[strlen(op) - 2] != '0'
&& op[strlen(op) - 2] != '1'
&& op[strlen(op) - 2] != '2'
&& op[strlen(op) - 2] != '3')
{
return 0;
}
// 倒数第三个字符必须是r
if (op[strlen(op) - 3] != 'r')
{
return 0;
}
// 倒数第四个字符必须是$
if (op[strlen(op) - 4] != '$')
{
return 0;
}
// 倒数第五个字符必须是'('
if (op[strlen(op) - 5] != '(')
{
return 0;
}
// 第2个到倒数第6个字符都必须是数字
// 第一个字符可以为‘-’，表示负数
if (op[0] == '-')
{
for(i=1; i<(int)strlen(op)-5; i++)
{
if(!isdigit(op[i]))
{
return 0;
}
}
}
else
{
for(i=0; i<(int)strlen(op)-5; i++)
{
if(!isdigit(op[i]))
{
return 0;
}
}
}
return 1;
}
// 根据 r? 寄存器，得到一个机器码
char get_machine_code_from_operand(const char* operand)
{
if (operand[strlen(operand) - 2] == '0')
{
return (char)0;
}
else if (operand[strlen(operand) - 2] == '1')
{
return (char)1;
}
else if (operand[strlen(operand) - 2] == '2')
{
return (char)2;
}
else if (operand[strlen(operand) - 2] == '3')
{
return (char)3;
}
else
{
return (char)(-1);
}
}
//////////////////////////////////////////////////////////////////////////
// R型指令
//
// or $rd, $rs, $rt
void parse_or(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(or_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd;
machine_code_address++;
}
else
{
error_msg_wrong_op(or_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// and $rd, $rs, $rt
void parse_and(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(and_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x01;
machine_code_address++;
}
else
{
error_msg_wrong_op(and_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// add $rd, $rs, $rt
void parse_add(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(add_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x02;
machine_code_address++;
}
else
{
error_msg_wrong_op(add_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// sub $rd, $rs, $rt
void parse_sub(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(sub_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x03;
machine_code_address++;
}
else
{
error_msg_wrong_op(sub_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// sllv $rd, $rs, $rt
void parse_sllv(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(sllv_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x04;
machine_code_address++;
}
else
{
error_msg_wrong_op(sllv_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// srlv $rd, $rs, $rt
void parse_srlv(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(srlv_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x05;
machine_code_address++;
}
else
{
error_msg_wrong_op(srlv_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// srav $rd, $rs, $rt
void parse_srav(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(srav_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x06;
machine_code_address++;
}
else
{
error_msg_wrong_op(srav_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// slt $rd, $rs, $rt
void parse_slt(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(slt_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 2~0,3位运算方式编码
machine_code[machine_code_address] = rd | 0x07;
machine_code_address++;
}
else
{
error_msg_wrong_op(slt_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// xor $rd, $rs, $rt
void parse_xor(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(xor_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 3~0,4位运算方式编码
machine_code[machine_code_address] = rd | 0x08;
machine_code_address++;
}
else
{
error_msg_wrong_op(xor_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// nor $rd, $rs, $rt
void parse_nor(int line_num)
{
char *op1, *op2, *op3;
char rs, rt, rd;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(nor_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type >= OT_REGISTER_R0
&& op3_type <= OT_REGISTER_R3)
{
// 15~12共4位操作码都是0
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op3_type);
machine_code[machine_code_address] = rs | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 3~0,4位运算方式编码
machine_code[machine_code_address] = rd | 0x09;
machine_code_address++;
}
else
{
error_msg_wrong_op(nor_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// jr $rs
void parse_jr(int line_num)
{
char *op;
char rs;
unsigned long op_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op = strtok(NULL, delimit_char_comma);
if(NULL == op)
{
error_msg_miss_op(jr_instruction_keyword, line_num);
}
op_type = get_operand_type(op);
if(op_type >= OT_REGISTER_R0 && op_type <= OT_REGISTER_R3 )
{
// 15~12共4位操作码表示十进制数1
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op_type);
rs = rs << 2;
machine_code[machine_code_address] = 0x10 | rs;
machine_code_address++;
// 低8位
machine_code[machine_code_address] = 0x00;
machine_code_address++;
}
else
{
error_msg_wrong_op(jr_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// jalr $rs
void parse_jalr(int line_num)
{
char *op;
char rs;
unsigned long op_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op = strtok(NULL, delimit_char_comma);
if(NULL == op)
{
error_msg_miss_op(jalr_instruction_keyword, line_num);
}
op_type = get_operand_type(op);
if(op_type >= OT_REGISTER_R0 && op_type <= OT_REGISTER_R3 )
{
// 15~12共4位操作码表示十进制数2
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op_type);
rs = rs << 2;
machine_code[machine_code_address] = 0x20 | rs;
machine_code_address++;
// 低8位
machine_code[machine_code_address] = 0x00;
machine_code_address++;
}
else
{
error_msg_wrong_op(jalr_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// sll $rd, $rt, shamt
void parse_sll(int line_num)
{
char *op1, *op2, *op3;
char rd, rt, shamt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(sll_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_IMMEDIATE)
{
// 15~12共4位操作码表示十进制12
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op2_type);
machine_code[machine_code_address] = 0xC0 | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 5~4,2位编码移位数目
shamt = get_machine_code_from_immediate(op3);
// 3~0,4位运算方式编码
machine_code[machine_code_address] = rd | shamt | 0x04;
machine_code_address++;
}
else
{
error_msg_wrong_op(sll_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// srl $rd, $rt, shamt
void parse_srl(int line_num)
{
char *op1, *op2, *op3;
char rd, rt, shamt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(srl_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_IMMEDIATE)
{
// 15~12共4位操作码表示十进制13
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op2_type);
machine_code[machine_code_address] = 0xD0 | rt;
machine_code_address++;
// 7~6,2位rd寄存器编码
rd = get_machine_code_from_r(op1_type);
rd = rd << 6;
// 5~4,2位编码移位数目
shamt = get_machine_code_from_immediate(op3);
// 3~0,4位运算方式编码
machine_code[machine_code_address] = rd | shamt | 0x05;
machine_code_address++;
}
else
{
error_msg_wrong_op(srl_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
//////////////////////////////////////////////////////////////////////////
// I型指令
//
// ori $rt, $rs, imm
void parse_ori(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(ori_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_IMMEDIATE)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op1_type);
machine_code[machine_code_address] = 0x30 | rs | rt;
machine_code_address++;
// 7~0,8位立即数
machine_code[machine_code_address] = get_machine_code_from_immediate(op3);
machine_code_address++;
}
else
{
error_msg_wrong_op(ori_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// andi $rt, $rs, imm
void parse_andi(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(andi_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_IMMEDIATE)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op1_type);
machine_code[machine_code_address] = 0x40 | rs | rt;
machine_code_address++;
// 7~0,8位立即数
machine_code[machine_code_address] = get_machine_code_from_immediate(op3);
machine_code_address++;
}
else
{
error_msg_wrong_op(andi_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// addi $rt, $rs, imm
void parse_addi(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(addi_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_IMMEDIATE)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op2_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op1_type);
machine_code[machine_code_address] = 0x50 | rs | rt;
machine_code_address++;
// 7~0,8位立即数
machine_code[machine_code_address] = get_machine_code_from_immediate(op3);
machine_code_address++;
}
else
{
error_msg_wrong_op(addi_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// lw $rt, offset($rs)
void parse_lw(int line_num)
{
int i;
char *op1, *op2;
char immediate[8];
char rs, rt;
unsigned long op1_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2)
{
error_msg_miss_op(lw_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& is_lw_sw_instr_operand(op2))
{
rs = get_machine_code_from_operand(op2);
rs = rs << 2;
// 解析第一个到倒数第六个字符得到一个十进制数
for(i=0; i<(int)strlen(op2)-5; i++)
{
immediate[i] = op2[i];
}
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op1_type);
machine_code[machine_code_address] = 0x60 | rs | rt;
machine_code_address++;
// 7~0,8位立即数
machine_code[machine_code_address] = get_machine_code_from_immediate(immediate);
machine_code_address++;
}
else
{
error_msg_wrong_op(lw_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// sw $rt, offset($rs)
void parse_sw(int line_num)
{
int i;
char *op1, *op2;
char immediate[8];
char rs, rt;
unsigned long op1_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2)
{
error_msg_miss_op(sw_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& is_lw_sw_instr_operand(op2))
{
rs = get_machine_code_from_operand(op2);
rs = rs << 2;
// 解析第一个到倒数第六个字符得到一个十进制数
for(i=0; i<(int)strlen(op2)-5; i++)
{
immediate[i] = op2[i];
}
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op1_type);
machine_code[machine_code_address] = 0x70 | rs | rt;
machine_code_address++;
// 7~0,8位立即数
machine_code[machine_code_address] = get_machine_code_from_immediate(immediate);
machine_code_address++;
}
else
{
error_msg_wrong_op(sw_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// beq $rs, $rt, label
void parse_beq(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(beq_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_SYMBOL)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op1_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op2_type);
machine_code[machine_code_address] = 0x80 | rs | rt;
machine_code_address++;
// 7~0,有符号偏移量offset
add_reallocate(op3, line_num, beq_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(beq_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// bne $rs, $rt, label
void parse_bne(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(bne_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_SYMBOL)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op1_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op2_type);
machine_code[machine_code_address] = 0x90 | rs | rt;
machine_code_address++;
// 7~0,有符号偏移量offset
add_reallocate(op3, line_num, bne_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(bne_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// bgt $rs, $rt, label
void parse_bgt(int line_num)
{
char *op1, *op2, *op3;
char rs, rt;
unsigned long op1_type, op2_type, op3_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
op3 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2 || NULL == op3)
{
error_msg_miss_op(bgt_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
op3_type = get_operand_type(op3);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type >= OT_REGISTER_R0
&& op2_type <= OT_REGISTER_R3
&& op3_type == OT_SYMBOL)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op1_type);
rs = rs << 2;
// 9~8,2位rt寄存器编码
rt = get_machine_code_from_r(op2_type);
machine_code[machine_code_address] = 0xA0 | rs | rt;
machine_code_address++;
// 7~0,有符号偏移量offset
add_reallocate(op3, line_num, bgt_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(bgt_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// bltz $rs, label
void parse_bltz(int line_num)
{
char *op1, *op2;
char rs;
unsigned long op1_type, op2_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char_comma);
if(NULL == op1 || NULL == op2)
{
error_msg_miss_op(bltz_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type == OT_SYMBOL)
{
// 15~12共4位操作码表示十进制数14
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op1_type);
rs = rs << 2;
machine_code[machine_code_address] = 0xE0 | rs;
machine_code_address++;
// 7~0,有符号偏移量offset
add_reallocate(op2, line_num, bltz_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(bltz_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
//////////////////////////////////////////////////////////////////////////
// J型指令
//
// jump label
void parse_jump(int line_num)
{
char *op;
unsigned long op_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op = strtok(NULL, delimit_char);
if(NULL == op)
{
error_msg_miss_op(jump_instruction_keyword, line_num);
}
op_type = get_operand_type(op);
if(OT_SYMBOL == op_type)
{
// jump label
machine_code[machine_code_address] = 0xB0;
machine_code_address++;
// 重定位
add_reallocate(op, line_num, jump_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(jump_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
// jal label
void parse_jal(int line_num)
{
char *op;
unsigned long op_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op = strtok(NULL, delimit_char);
if(NULL == op)
{
error_msg_miss_op(jal_instruction_keyword, line_num);
}
op_type = get_operand_type(op);
if(OT_SYMBOL == op_type)
{
// jal label
machine_code[machine_code_address] = 0xF0;
machine_code_address++;
// 重定位
add_reallocate(op, line_num, jal_instruction_keyword);
machine_code_address++;
}
else
{
error_msg_wrong_op(jal_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
//////////////////////////////////////////////////////////////////////////
// DISP指令
//
// DISP $rs, imm
void parse_disp(int line_num)
{
char *op1, *op2;
char rs;
unsigned long op1_type, op2_type;
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
op1 = strtok(NULL, delimit_char_comma);
op2 = strtok(NULL, delimit_char);
if(NULL == op1 || NULL == op2)
{
error_msg_miss_op(jal_instruction_keyword, line_num);
}
op1_type = get_operand_type(op1);
op2_type = get_operand_type(op2);
if(op1_type >= OT_REGISTER_R0
&& op1_type <= OT_REGISTER_R3
&& op2_type == OT_IMMEDIATE)
{
// 15~12共4位操作码
// 11~10,2位rs寄存器编码
rs = get_machine_code_from_r(op1_type);
rs = rs << 2;
machine_code[machine_code_address] = 0x01 | rs;
machine_code_address++;
// DISP指令的立即数字段只有0、1两个取值，用来选择在0号显示器还是1号显示器显示rs中的内容
machine_code[machine_code_address] = get_machine_code_from_immediate(op2);
machine_code_address++;
}
else
{
error_msg_wrong_op(jal_instruction_keyword, line_num);
}
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
//////////////////////////////////////////////////////////////////////////
// halt指令
//
// halt
void parse_halt(int line_num)
{
if(assembler_state != AS_TEXT)
{
warning_msg_invalid_line(line_num);
return;
}
machine_code[machine_code_address] = 0xC0;
machine_code_address++;
machine_code[machine_code_address] = 0x00;
machine_code_address++;
//
// 在代码行数据库中，标记此行是一个指令行
//
line_database[line_count].flag |= LF_INSTRUCTION;
}
//////////////////////////////////////////////////////////////////////////
//
// 向符号表中添加一个符号
void add_symbol(const char* symbol, int line_num)
{
int i;
// 符号名称不能重复
for(i=0; i<symbol_count; i++)
{
if(stricmp(symbol, symbol_table[i].name) == 0)
{
error_msg_same_symbol(symbol, line_num, symbol_table[i].line_num);
}
}
// 符号数量有限
if(symbol_count == MAX_SYMBOL_COUNT)
{
sprintf(formated_msg, "定义了太多的符号。最多可以定义 %d 个符号。", MAX_SYMBOL_COUNT);
error_msg(formated_msg, line_num);
}
// 添加符号
strcpy(symbol_table[symbol_count].name, symbol);
symbol_table[symbol_count].address = machine_code_address;
symbol_table[symbol_count].line_num = line_num;
symbol_count++;
}
// 解析符号
void parse_symbol(const char* symbol_with_colon, int line_num)
{
char symbol[MAX_SYMBOL_LENGTH];
char* token;
// 删除符号末尾的冒号
strcpy(symbol, symbol_with_colon);
symbol[strlen(symbol) - 1] = 0;
if(AS_TEXT == assembler_state)
{
// 代码段中的标号作为符号。记录到符号表中，不产生机器码。
add_symbol(symbol, line_num);
// 标号必须单独占一行，否则报错
if (strtok(NULL, delimit_char) != NULL)
{
error_msg("标号必须单独占用一行。", line_num);
}
}
else if(AS_DATA == assembler_state)
{
// 数据段中的变量作为符号。一个变量可以包含多个字节数据。记录到符号表中，产生机器码。
add_symbol(symbol, line_num);
while((token = strtok(NULL, delimit_char)) != NULL)
{
if(!is_immediate(token))
{
error_msg_wrong_data(token, line_num);
}
machine_code[machine_code_address] = get_machine_code_from_immediate(token);
machine_code_address++;
symbol_table[symbol_count - 1].machine_code_count++;
}
}
else
{
warning_msg_invalid_line(line_num);
}
}
// 解析代码段开始标志
void parse_code_section_keyword(int line_num)
{
// 代码段标志
if(AS_DATA == assembler_state)
{
error_msg("代码段不能定义在数据段的后面。", line_num);
}
else if(AS_TEXT == assembler_state)
{
error_msg("定义了重复的代码段。", line_num);
}
assembler_state = AS_TEXT;
}
// 解析数据段开始标志
void parse_data_section_keyword(int line_num)
{
// 数据段标志
if(AS_DATA == assembler_state)
{
error_msg("定义了重复的数据段。", line_num);
}
else if(AS_BEGIN == assembler_state)
{
error_msg("数据段不能定义在代码段的前面。", line_num);
}
assembler_state = AS_DATA;
}
// 定义关键字和解析函数的对应关系
typedef void (*PARSE_FUNCTION)(int line_num);
struct KEYWORD_FUNCTION_ENTRY
{
const char** keyword;
PARSE_FUNCTION parse_function;
};
//
// 必须将关键字及其解析函数放在下面的表中。从而可以使用“表驱动”的编程模式。
//
struct KEYWORD_FUNCTION_ENTRY keyword_function_table[] =
{
{ NULL, NULL } // 未用
,{ &code_section_keyword, parse_code_section_keyword }
,{ &data_section_keyword, parse_data_section_keyword }
,{ &or_instruction_keyword, parse_or }
,{ &and_instruction_keyword, parse_and }
,{ &add_instruction_keyword, parse_add }
,{ &sub_instruction_keyword, parse_sub }
,{ &sllv_instruction_keyword, parse_sllv }
,{ &srlv_instruction_keyword, parse_srlv }
,{ &srav_instruction_keyword, parse_srav }
,{ &slt_instruction_keyword, parse_slt }
,{ &jr_instruction_keyword, parse_jr }
,{ &jalr_instruction_keyword, parse_jalr }
,{ &xor_instruction_keyword, parse_xor }
,{ &nor_instruction_keyword, parse_nor }
,{ &srl_instruction_keyword, parse_srl }
,{ &sra_instruction_keyword, NULL }
,{ &sll_instruction_keyword, parse_sll }
,{ &ori_instruction_keyword, parse_ori }
,{ &andi_instruction_keyword, parse_andi }
,{ &addi_instruction_keyword, parse_addi }
,{ &lw_instruction_keyword, parse_lw }
,{ &sw_instruction_keyword, parse_sw }
,{ &beq_instruction_keyword, parse_beq }
,{ &bne_instruction_keyword, parse_bne }
,{ &bgt_instruction_keyword, parse_bgt }
,{ &bltz_instruction_keyword, parse_bltz }
,{ &bgez_instruction_keyword, NULL }
,{ &jump_instruction_keyword, parse_jump }
,{ &jal_instruction_keyword, parse_jal }
,{ &r0_register_keyword, NULL }
,{ &r1_register_keyword, NULL }
,{ &r2_register_keyword, NULL }
,{ &r3_register_keyword, NULL }
,{ &ra_register_keyword, NULL }
,{ &t0_register_keyword, NULL }
};
// 判断是否是一个关键字。返回0，不是关键字；返回非0，是关键字，并且返回值就是关键字在表中的下标。
int match_keyword(const char* token)
{
int i;
for(i=1; i<sizeof(keyword_function_table)/sizeof(keyword_function_table[0]); i++)
{
if(stricmp(token, *keyword_function_table[i].keyword) == 0)
{
return i;
}
}
return 0;
}
// 判断是否是一个符号
int is_symbol(const char* token, int line_num)
{
int i;
char symbol_name[MAX_SYMBOL_LENGTH];
// 最后一个字符必须是冒号
if(token[strlen(token) - 1] != ':')
{
return 0;
}
// 第一个字符必须是字母或者下划线
if(token[0] != '_' && !isalpha(token[0]))
{
return 0;
}
// 后面的字符必须是字母、数字、下划线
for(i=0; i<(int)strlen(token)-2; i++)
{
if(token[i] != '_' && !isalpha(token[i]) && !isdigit(token[i]))
{
return 0;
}
}
// 不能与关键字相同
strcpy(symbol_name, token);
symbol_name[strlen(symbol_name) - 1] = 0;
if(match_keyword(symbol_name) != 0)
{
error_msg_keyword_symbol(symbol_name, line_num);
}
return 1;
}
// 输出版本信息
void version_msg()
{
printf(
"Engintime 16bit MIPS 指令汇编器 [版本 2.0]\n"
);
}
// 输出帮助信息
void help_msg()
{
printf(
"Engintime 16bit MIPS 指令汇编器。\n\n"
"用法:\n\n"
" dmasm.exe assembly_file_name [options]\n\n"
"选项:\n\n"
" -g debug_file_name\t指定生成的调试信息文件路径。\n"
" -h\t\t\t打印此帮助信息。\n"
" -l list_file_name\t指定生成的列表文件路径。\n"
" -o target_file_name\t指定生成的目标文件路径。若未指定，默认生成 a.obj 文件。\n"
" -v\t\t\t打印版本信息。\n"
);
printf("\n");
version_msg();
exit(1);
}
void argument_error_msg()
{
printf("命令行参数错误。\n\n");
help_msg();
}
// 处理器用户输入的命令行参数
void process_argument(int argc, char* argv[])
{
int i;
// argv[0] 是 "easm.exe"，所以可以忽略。
for(i=1; i<argc; i++)
{
if(strcmp(argv[i], "-v") == 0)
{
version_msg();
exit(1);
}
else if(strcmp(argv[i], "-h") == 0)
{
help_msg();
}
else if(strcmp(argv[i], "-o") == 0)
{
if(i + 1 < argc)
{
i++;
target_file_name = argv[i];
}
else
{
argument_error_msg();
}
}
else if(strcmp(argv[i], "-l") == 0)
{
if(i + 1 < argc)
{
i++;
list_file_name = argv[i];
}
else
{
argument_error_msg();
}
}
else if(strcmp(argv[i], "-g") == 0)
{
if(i + 1 < argc)
{
i++;
dbg_file_name = argv[i];
}
else
{
argument_error_msg();
}
}
else if(NULL == assembly_file_name && argv[i][0] != '-')
{
// 输入的汇编源代码文件路径。
assembly_file_name = argv[i];
}
else
{
argument_error_msg();
}
}
//
// 如果命令行参数中没有指定输入的汇编文件，就打印错误信息后退出
//
if(NULL == assembly_file_name)
{
printf("命令行参数错误。没有指定汇编源代码文件的路径。\n");
help_msg();
}
}
// 将一个字符串写入二进制文件中。先将字符串长度写入文件，然后将字符串中的
// 每个字符依次写入文件，不包括字符串末尾的 0.
void write_string_to_binary_file(const char* str, FILE* fp)
{
int str_length;
if(str != NULL)
{
str_length = strlen(str);
fwrite(&str_length, 1, sizeof(str_length), fp);
fwrite(str, 1, str_length, fp);
}
else
{
str_length = 0;
fwrite(&str_length, 1, sizeof(str_length), fp);
}
}
int main(int argc, char* argv[])
{
FILE* fp;
char* token;
char line[MAX_LINE_LENGTH];
int i, j;
int line_num = 1; // 行号从第一行开始计数
int keyword_index;
unsigned long base_PC, offset_PC;
//
// 处理命令行参数
//
process_argument(argc, argv);
//
// 打开汇编源代码文件
//
fp = fopen(assembly_file_name, "r");
if(NULL == fp)
{
printf("无法打开源代码文件 %s\n", assembly_file_name);
return 1;
}
//////////////////////////////////////////////////////////////////////////
// 第一遍扫描
version_msg();
printf("\n正在汇编 %s...\n", assembly_file_name);
//
// 一次读取一行文本，同时记录所有的代码行信息
//
while(fgets(line, sizeof(line), fp) != NULL)
{
//
// 将一行代码的信息记录到代码行数据库中
//
strcpy(line_database[line_count].line_string, line);
line_database[line_count].line_num = line_num;
line_database[line_count].address = machine_code_address;
//
// 将代码行中的注释剥离
//
line[strcspn(line, ";")] = 0;
//
// 开始解析代码行
//
token = strtok(line, delimit_char);
if(NULL == token)
{
// 如果是空行，不做任何处理
}
else if((keyword_index = match_keyword(token)) != 0
&& keyword_function_table[keyword_index].parse_function != NULL)
{
// 根据关键字进行相应的处理
keyword_function_table[keyword_index].parse_function(line_num);
}
else if(is_symbol(token, line_num))
{
// 处理符号
parse_symbol(token, line_num);
}
else
{
error_msg("无法识别的代码行。", line_num);
}
//
// 补充代码行数据库信息
//
line_database[line_count].machine_code_count = machine_code_address - machine_code_old_address;
machine_code_old_address = machine_code_address;
//
// 记录产生了机器码的代码行数量
//
if(line_database[line_count].machine_code_count != 0)
{
machine_code_line_count++;
}
//
// 增加行号
//
line_count++;
line_num++;
if(line_count == MAX_LINE_COUNT)
{
sprintf(formated_msg, "汇编文件中的代码行过多，最多只能有 %d 行代码。", MAX_LINE_COUNT);
error_msg(formated_msg, -1);
}
}
fclose(fp);
//////////////////////////////////////////////////////////////////////////
// 第二遍扫描
//
// 根据符号表更新重定位表
//
for(i=0; i<reallocate_count; i++)
{
for(j=0; j<symbol_count; j++)
{
if(stricmp(symbol_table[j].name, reallocate_table[i].symbol_name) == 0)
{
if (stricmp(beq_instruction_keyword, reallocate_table[i].instr_key_word) == 0
|| stricmp(bne_instruction_keyword, reallocate_table[i].instr_key_word) == 0
|| stricmp(bgt_instruction_keyword, reallocate_table[i].instr_key_word) == 0
|| stricmp(bltz_instruction_keyword, reallocate_table[i].instr_key_word) == 0)
{
// 条件转移指令
// 因为标号是指令的第二个字节编码，所以标号地址首先减1，指向该条指令。
// 然后加2，指向下一条指令。因为偏移是相对于PC+2后的地址计算的
//
machine_code[reallocate_table[i].address] = (BYTE)((symbol_table[j].address - (reallocate_table[i].address - 1 + 2))/2);
symbol_table[j].ref_count++;
}
else if (stricmp(jump_instruction_keyword, reallocate_table[i].instr_key_word) == 0
|| stricmp(jal_instruction_keyword, reallocate_table[i].instr_key_word) == 0)
{
//
// 无条件转移指令
//
// 获取跳转指令地址高4位，低12位置为0，作为无条件跳转指令的相对偏移基址
base_PC = reallocate_table[i].address & 0xf000;
// 获取标号地址相对于基地址的偏移，并取出其中的低12位做为有效位
offset_PC = (symbol_table[j].address - base_PC) & 0x0fff;
// 更新跳转指令编码
machine_code[reallocate_table[i].address - 1] = (BYTE)(machine_code[reallocate_table[i].address - 1] | offset_PC >> 8);
machine_code[reallocate_table[i].address] = (BYTE)(offset_PC/2);
symbol_table[j].ref_count++;
}
break;
}
}
if(j == symbol_count)
{
// 重定位表中使用的符号在符号表中未定义，报错
sprintf(formated_msg, "使用了未定义的符号 %s。", reallocate_table[i].symbol_name);
error_msg(formated_msg, reallocate_table[i].line_num);
}
}
//
// 如果存在未引用的符号，输出警告信息。
//
for(i=0; i<symbol_count; i++)
{
if(0 == symbol_table[i].ref_count)
{
warning_msg_unref_symbol(symbol_table[i].name, symbol_table[i].line_num);
}
}
//////////////////////////////////////////////////////////////////////////
// 产生各种输出文件
//
// 将机器码写入二进制文件
//
if(NULL == target_file_name)
{
target_file_name = "a.obj";
}
fp = fopen(target_file_name, "wb");
if(NULL == fp)
{
printf("无法打开输出文件 %s\n", target_file_name);
return 1;
}
fwrite(machine_code, 1, machine_code_address, fp);
fclose(fp);
printf("\n生成目标文件 %s\n", target_file_name);
//
// 将代码行数据库中的信息写入列表文件
//
if(list_file_name != NULL)
{
fp = fopen(list_file_name, "w");
if(NULL == fp)
{
printf("无法打开列表文件 %s\n", list_file_name);
return 1;
}
for(i=0; i<line_count; i++)
{
// 行号
fprintf(fp, "%04d ", line_database[i].line_num);
// 地址和机器码
if(line_database[i].machine_code_count > 0)
{
fprintf(fp, "%02X ", line_database[i].address);
for(j=0; j<line_database[i].machine_code_count; j++)
{
// 确保每行最多写两个字节的机器码
if(j != 0 && j % 2 == 0)
{
if(2 == j)
{
fprintf(fp, " ");
}
else
{
fprintf(fp, "\n ");
}
}
fprintf(fp, "%02X ", machine_code[line_database[i].address + j]);
if(1 == j)
{
fprintf(fp, " ");
fprintf(fp, line_database[i].line_string);
}
}
if(1 == j)
{
fprintf(fp, " ");
fprintf(fp, line_database[i].line_string);
}
else if(j > 2)
{
fprintf(fp, "\n");
}
}
else
{
fprintf(fp, " ");
// 源代码
fprintf(fp, line_database[i].line_string);
}
}
fclose(fp);
printf("生成列表文件 %s\n", list_file_name);
}
//
// 将代码行数据库中的信息写入二进制的调试信息文件。
//
// 调试信息的基本格式为：
// 魔数（4字节），固定不可改变
// 版本号（4字节），固定不可改变
// 源代码文件绝对路径字符串长度（4字节）
// 源代码文件绝对路径字符串（不包括字符串结尾的0）
// 列表文件绝对路径字符串长度（4字节）
// 列表文件绝对路径字符串（不包括字符串结尾的0）
//
// 代码行数据库中元素的数量（4字节）
// 代码行数据库中的所有元素
//
// 符号表元素的数量（4字节）
// 符号表中的所有元素
//
if(dbg_file_name != NULL)
{
fp = fopen(dbg_file_name, "wb");
if(NULL == fp)
{
printf("无法打开调试信息文件 %s\n", dbg_file_name);
return 1;
}
// 魔数
fwrite(&dbg_file_magic, 1, sizeof(dbg_file_magic), fp);
// 版本号
fwrite(&dbg_file_version, 1, sizeof(dbg_file_version), fp);
// 源代码文件路径
write_string_to_binary_file(assembly_file_name, fp);
// 列表文件路径
write_string_to_binary_file(list_file_name, fp);
// 代码行数据库中的所有元素
fwrite(&machine_code_line_count, 1, sizeof(machine_code_line_count), fp);
for(i=0; i<line_count; i++)
{
// 跳过没有产生机器码的代码行
if(0 == line_database[i].machine_code_count)
{
continue;
}
fwrite(&line_database[i].line_num, 1, sizeof(unsigned long), fp);
fwrite(&line_database[i].address, 1, sizeof(unsigned long), fp);
fwrite(&line_database[i].machine_code_count, 1, sizeof(int), fp);
fwrite(&line_database[i].flag, 1, sizeof(unsigned long), fp);
}
// 符号表中的所有元素
fwrite(&symbol_count, 1, sizeof(symbol_count), fp);
for(i=0; i<symbol_count; i++)
{
write_string_to_binary_file(symbol_table[i].name, fp);
fwrite(&symbol_table[i].address, 1, sizeof(unsigned long), fp);
fwrite(&symbol_table[i].machine_code_count, 1, sizeof(int), fp);
fwrite(&symbol_table[i].line_num, 1, sizeof(int), fp);
}
fclose(fp);
printf("生成调试信息文件 %s\n", dbg_file_name);
}
return 0;
}
multi_mux.dlsche.svg 0 → 100644
浏览文件 @ 348288ca
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<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="105" font-weight="700" text-anchor="start" x="930" y="260">3选1复用器</text>
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ram.asm 0 → 100644
浏览文件 @ 348288ca
.text
addi $r2, $r0, 5 ;r2 = r0 + 5
addi $r3, $r0, 12 ;r3 = r0 + 12
addi $r1, $r3, -9 ;r1 = r3 + (-9)
or $r3, $r0, $r1 ;r3 = r0 | r1
and $r2, $r2, $r3 ;r2 = r2 & r3
add $r3, $r3, $r1 ;r3 = r3 + r1
beq $r1, $r3, end ;if r1 == r3, goto end
slt $r3, $r2, $r3 ;r3 = r2 < r3 ? 1 : 0
andi $r3, $r3, 0 ;r3 = r3 & 0
andi $r0, $r1, 0 ;r0 = r1 & 0
beq $r3, $r0, F1 ;if r3 == r0, goto F1
addi $r0, $r1, 0 ;r0 = r1 + 0
end:
sw $r2, 84($r0) ;mem[r0+84] = r2
sllv $r1, $r1, $r0 ;r1 = r1 << r0
bne $r1, $r2, NEXT ;if r1 != r2, goto NEXT
F1:
slt $r3, $r1, $r2 ;r3 = r1 < r2 ? 1 : 0
add $r3, $r2, $r1 ;r3 = r2 + r1
sub $r2, $r2, $r0 ;r2 = r2 - r0
sw $r3, 68($r3) ;mem[r3+68] = r3
lw $r3, 80($r0) ;r3 = mem[r0+80]
jump end ;goto end
addi $r2, $r0, 1 ;r2 = r0 + 1
NEXT:
sub $r1, $r1, $r0 ;r1 = r1 - r0
add $r1, $r1, $r0 ;r1 = r1 + r0
sllv $r3, $r0, $r1 ;r3 = r0 << r1
ori $r1, $r1, 3 ;r1 = r1 | 3
srav $r3, $r3, $r1 ;r3 = r3 >> r1
andi $r1, $r2, 4 ;r1 = r2 + 4
ram.bat 0 → 100644
浏览文件 @ 348288ca
@echo off
mipsasm.exe ram.asm -o ram.rxm -l ram.lst -g ram.dbg
pause
ram.dbg 0 → 100644
浏览文件 @ 348288ca
添加文件
ram.lst 0 → 100644
浏览文件 @ 348288ca
0001 .text
0002
0003 00 52 05 addi $r2, $r0, 5 ;r2 = r0 + 5
0004 02 53 0C addi $r3, $r0, 12 ;r3 = r0 + 12
0005 04 5D F7 addi $r1, $r3, -9 ;r1 = r3 + (-9)
0006
0007 06 01 C0 or $r3, $r0, $r1 ;r3 = r0 | r1
0008 08 0B 81 and $r2, $r2, $r3 ;r2 = r2 & r3
0009 0A 0D C2 add $r3, $r3, $r1 ;r3 = r3 + r1
0010
0011 0C 87 05 beq $r1, $r3, end ;if r1 == r3, goto end
0012 0E 0B C7 slt $r3, $r2, $r3 ;r3 = r2 < r3 ? 1 : 0
0013 10 4F 00 andi $r3, $r3, 0 ;r3 = r3 & 0
0014 12 44 00 andi $r0, $r1, 0 ;r0 = r1 & 0
0015
0016 14 8C 04 beq $r3, $r0, F1 ;if r3 == r0, goto F1
0017 16 54 00 addi $r0, $r1, 0 ;r0 = r1 + 0
0018
0019 end:
0020 18 72 54 sw $r2, 84($r0) ;mem[r0+84] = r2
0021 1A 04 44 sllv $r1, $r1, $r0 ;r1 = r1 << r0
0022 1C 96 07 bne $r1, $r2, NEXT ;if r1 != r2, goto NEXT
0023
0024 F1:
0025 1E 06 C7 slt $r3, $r1, $r2 ;r3 = r1 < r2 ? 1 : 0
0026 20 09 C2 add $r3, $r2, $r1 ;r3 = r2 + r1
0027 22 08 83 sub $r2, $r2, $r0 ;r2 = r2 - r0
0028 24 7F 44 sw $r3, 68($r3) ;mem[r3+68] = r3
0029 26 63 50 lw $r3, 80($r0) ;r3 = mem[r0+80]
0030 28 B0 0C jump end ;goto end
0031 2A 52 01 addi $r2, $r0, 1 ;r2 = r0 + 1
0032
0033 NEXT:
0034 2C 04 43 sub $r1, $r1, $r0 ;r1 = r1 - r0
0035 2E 04 42 add $r1, $r1, $r0 ;r1 = r1 + r0
0036
0037 30 01 C4 sllv $r3, $r0, $r1 ;r3 = r0 << r1
0038
0039 32 35 03 ori $r1, $r1, 3 ;r1 = r1 | 3
0040 34 0D C6 srav $r3, $r3, $r1 ;r3 = r3 >> r1
0041 36 49 04 andi $r1, $r2, 4 ;r1 = r2 + 4
0042
0043
0044
0045
0046
ram.rxm 0 → 100644
浏览文件 @ 348288ca
添加文件
reg.dlsche 0 → 100644
浏览文件 @ 348288ca
添加文件
reg.dlsche.svg 0 → 100644
浏览文件 @ 348288ca
这个 源代码变更 因为 太大 而不能显示。 你可以 浏览blob 。
regdst_mux.dlsche.svg 0 → 100644
浏览文件 @ 348288ca
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="312" y="523">rd寄存器</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1362" y="313">U50</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1312" y="343">NBUFFER</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1312" x2="1252" y1="593" y2="593"/>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1392" x2="1452" y1="593" y2="593"/>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1362" y="513">U51</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1312" y="543">NBUFFER</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1312" x2="1252" y1="793" y2="793"/>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1392" x2="1452" y1="793" y2="793"/>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1362" y="713">U52</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1312" y="743">NBUFFER</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1312" x2="1252" y1="993" y2="993"/>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1392" x2="1452" y1="993" y2="993"/>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1362" y="913">U53</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1312" y="943">NBUFFER</text>
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="852" y="793">rt0</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="852" y="993">rt1</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="852" y="393">rd0</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="852" y="593">rd1</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="1702" y="393">Reg0</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="1702" y="593">Reg1</text>
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<text alignment-baseline="central" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="2272" y="443">Reg[1..0]</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1012" y="789">NOT</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="292" y="653">I型指令选中rt作为目的寄存器</text>
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<text alignment-baseline="central" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="22" y="543">rd[1..0]</text>
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<text alignment-baseline="central" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="22" y="693">s</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="105" font-weight="700" text-anchor="start" x="822" y="143">目的寄存器选择器</text>
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