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initial mips32 (r2000ish mips32r6) assembler

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Freya Murphy 2024-09-09 12:41:49 -04:00
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

5
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### mips toolchain
lots to do still
do not use the

7
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-c
-std=c2x
-Wall
-Wextra
-pedantic
-Wno-gnu-binary-literal
-Iinclude

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# ======================= COMPILE OPTIONS ==
CC=cc
LD=cc
CFLAGS += -pipe
CFLAGS += -Wall -Wextra -pedantic
CFLAGS += -O3 -g
# ======================== CONFIG OPTIONS ==
#
# MAX LEX LENGTH
# Specifies how long a ident, register,
# instruction name, or any type of variable
# length text can be inside the lexer
#
# CFLAGS+= -DMAX_LEX_LENGTH=24
#
#
# MAX_ARG_LENGTH
# Specifies how many max arguments a given
# directive can hold
#
# CFLAGS+= -DMAX_ARG_LENGTH=12

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __MERROR_H__
#define __MERROR_H__
/* Error codes
*/
#define M_SUCCESS 0
#define M_EOF 1
#define M_ERROR -1
#define __DEBUG 1
#define __WARNING 2
#define __ERROR 3
__attribute__((format(printf, 4, 5)))
void __log_impl_pos(int line, int column, int type, const char *format, ...);
void __log_impl(int type, const char *format, ...);
#define DEBUG(format, ...) \
__log_impl(__DEBUG, format, ##__VA_ARGS__)
#define WARNING(format, ...) \
__log_impl(__WARNING, format, ##__VA_ARGS__)
#define ERROR(format, ...) \
__log_impl(__ERROR, format, ##__VA_ARGS__)
#define DEBUG_POS(pos, format, ...) \
__log_impl_pos(pos.y, pos.x, __DEBUG, format, ##__VA_ARGS__)
#define WARNING_POS(pos, format, ...) \
__log_impl_pos(pos.y, pos.x, __WARNING, format, ##__VA_ARGS__)
#define ERROR_POS(pos, format, ...) \
__log_impl_pos(pos.y, pos.x, __ERROR, format, ##__VA_ARGS__)
#endif /* __MERROR_H__ */

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __MIPS_H__
#define __MIPS_H__
#include <mips32.h>
union mips_instruction {
struct mips32_instruction mips32;
};
union mips_directive {
struct mips32_directive mips32;
};
#endif /* __MIPS_H */

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __MIPS32_H__
#define __MIPS32_H__
#include <mlimits.h>
#include <stdint.h>
/* all mips registers $0-$31 */
enum mips32_register {
MIPS32_REG_ZERO = 0,
MIPS32_REG_AT = 1,
MIPS32_REG_V0 = 2,
MIPS32_REG_V1 = 3,
MIPS32_REG_A0 = 4,
MIPS32_REG_A1 = 5,
MIPS32_REG_A2 = 6,
MIPS32_REG_A3 = 7,
MIPS32_REG_T0 = 8,
MIPS32_REG_T1 = 9,
MIPS32_REG_T2 = 10,
MIPS32_REG_T3 = 11,
MIPS32_REG_T4 = 12,
MIPS32_REG_T5 = 13,
MIPS32_REG_T6 = 14,
MIPS32_REG_T7 = 15,
MIPS32_REG_S0 = 16,
MIPS32_REG_S1 = 17,
MIPS32_REG_S2 = 18,
MIPS32_REG_S3 = 19,
MIPS32_REG_S4 = 20,
MIPS32_REG_S5 = 21,
MIPS32_REG_S6 = 22,
MIPS32_REG_S7 = 23,
MIPS32_REG_T8 = 24,
MIPS32_REG_T9 = 25,
MIPS32_REG_K0 = 26,
MIPS32_REG_K1 = 27,
MIPS32_REG_GP = 28,
MIPS32_REG_SP = 29,
MIPS32_REG_FP = 30,
MIPS32_REG_RA = 31,
};
/* mips instruction format */
enum mips32_instruction_format {
MIPS32_FORMAT_R,
MIPS32_FORMAT_I,
MIPS32_FORMAT_J,
MIPS32_FORMAT_B,
};
/* mips instructions */
enum mips32_instruction_type {
MIPS32_INS_ADD,
MIPS32_INS_ADDI,
MIPS32_INS_ADDIU,
MIPS32_INS_ADDU,
MIPS32_INS_AND,
MIPS32_INS_ANDI,
MIPS32_INS_BAL,
MIPS32_INS_BALC,
MIPS32_INS_BC,
MIPS32_INS_BEQ,
MIPS32_INS_BEQL,
MIPS32_INS_BGEZ,
MIPS32_INS_BGEZAL,
MIPS32_INS_BGEZALL,
MIPS32_INS_BGEZL,
MIPS32_INS_BGTZ,
MIPS32_INS_BGTZL,
MIPS32_INS_BLEZ,
MIPS32_INS_BLEZL,
MIPS32_INS_BLTZ,
MIPS32_INS_BLTZAL,
MIPS32_INS_BLTZALL,
MIPS32_INS_BLTZL,
MIPS32_INS_BNE,
MIPS32_INS_BNEL,
MIPS32_INS_DDIV,
MIPS32_INS_DDIVU,
MIPS32_INS_DIV,
MIPS32_INS_DIVU,
MIPS32_INS_J,
MIPS32_INS_JAL,
MIPS32_INS_JALR,
MIPS32_INS_JALX,
MIPS32_INS_JR,
MIPS32_INS_LB,
MIPS32_INS_LBU,
MIPS32_INS_LH,
MIPS32_INS_LHU,
MIPS32_INS_LUI,
MIPS32_INS_LW,
MIPS32_INS_LWL,
MIPS32_INS_LWR,
MIPS32_INS_MFHI,
MIPS32_INS_MFLO,
MIPS32_INS_MTHI,
MIPS32_INS_MTLO,
MIPS32_INS_MULT,
MIPS32_INS_MULTU,
MIPS32_INS_SB,
MIPS32_INS_SH,
MIPS32_INS_SW,
MIPS32_INS_SWL,
MIPS32_INS_SWR,
MIPS32_INS_SLL,
MIPS32_INS_SLLV,
MIPS32_INS_SLT,
MIPS32_INS_SLTI,
MIPS32_INS_SLTIU,
MIPS32_INS_SLTU,
MIPS32_INS_SRA,
MIPS32_INS_SRAV,
MIPS32_INS_SRL,
MIPS32_INS_SRLV,
MIPS32_INS_SUB,
MIPS32_INS_SUBU,
MIPS32_INS_OR,
MIPS32_INS_ORI,
MIPS32_INS_NOR,
MIPS32_INS_XOR,
MIPS32_INS_XORI,
// gets the size of the enum
__MIPS32_INS_LEN,
};
/* mips instruction R TYPE */
struct mips32_instruction_r_data {
uint32_t funct : 6;
uint32_t shamt : 5;
uint32_t rd : 5;
uint32_t rt : 5;
uint32_t rs : 5;
uint32_t op : 6;
} __attribute__((packed));
/* mips instruction I TYPE */
struct mips32_instruction_i_data {
uint32_t immd : 16;
uint32_t rt : 5;
uint32_t rs : 5;
uint32_t op : 6;
} __attribute__((packed));
/* mips instruction J TYPE */
struct mips32_instruction_j_data {
uint32_t target : 26;
uint32_t op : 6;
} __attribute__((packed));
/* mips instruction BRANCH TYPE */
struct mips32_instruction_branch_data {
int32_t offset : 16;
uint32_t funct : 5;
uint32_t rs : 5;
uint32_t op : 6;
} __attribute__((packed));
/* mips instruction information */
struct mips32_instruction {
// metadata
enum mips32_instruction_type type;
enum mips32_instruction_format format;
const char *name;
// data
union {
uint32_t data;
struct mips32_instruction_r_data R_data;
struct mips32_instruction_i_data I_data;
struct mips32_instruction_j_data J_data;
struct mips32_instruction_branch_data B_data;
} __attribute__((packed));
};
#define MIPS32_INS(ins, format, ...) \
[MIPS32_INS_ ##ins] = { \
MIPS32_INS_ ##ins, \
MIPS32_FORMAT_ ##format, \
#ins, \
.format##_data = { __VA_ARGS__ } \
}, \
static const struct mips32_instruction mips32_instructions[] = {
/* ADD - add */
#define MIPS32_OP_SPECIAL 0b000000
#define MIPS32_FUNCT_ADD 0b100000
MIPS32_INS(ADD, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_ADD)
/* ADDI - add immediate */
#define MIPS32_OP_ADDI 0b001000
MIPS32_INS(ADDI, I, .op = MIPS32_OP_ADDI)
/* ADDIU - add immediate unsigned */
#define MIPS32_OP_ADDIU 0b001001
MIPS32_INS(ADDIU, I, .op = MIPS32_OP_ADDIU)
/* ADDU - add unsigned */
#define MIPS32_FUNCT_ADDU 0b100001
MIPS32_INS(ADDU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_ADDU)
/* AND - and */
#define MIPS32_FUNCT_AND 0b100100
MIPS32_INS(AND, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_AND)
/* ANDI - and immediate */
#define MIPS32_OP_ANDI 0b001100
MIPS32_INS(ANDI, I, .op = MIPS32_OP_ANDI)
/* BAL - branch and link */
#define MIPS32_OP_REGIMM 0b000001
#define MIPS32_FUNCT_BAL 0b10001
MIPS32_INS(BAL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BAL)
/* BALC - branch and link, compact */
#define MIPS32_OP_BALC 0b111010
MIPS32_INS(BALC, J, .op = MIPS32_OP_BALC)
/* BC - branch, compact */
#define MIPS32_OP_BC 0b110010
MIPS32_INS(BC, J, .op = MIPS32_OP_BC)
/* BEQ - branch on equal */
#define MIPS32_OP_BEQ 0b000100
MIPS32_INS(BEQ, I, .op = MIPS32_OP_BEQ)
/* BEQL - branch on equal likely */
#define MIPS32_OP_BEQL 0b010100
MIPS32_INS(BEQL, I, .op = MIPS32_OP_BEQL)
/* BGEZ - branch on greater than or equal to zero */
#define MIPS32_FUNCT_BGEZ 0b00001
MIPS32_INS(BGEZ, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BGEZ)
/* BGEZAL - branch on greater than or equal to zero and link */
#define MIPS32_FUNCT_BGEZAL 0b10001
MIPS32_INS(BGEZAL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BGEZAL)
/* BGEZAL - branch on greater than or equal to zero and link likely */
#define MIPS32_FUNCT_BGEZALL 0b10011
MIPS32_INS(BGEZALL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BGEZALL)
/* BGEZL - branch on greater than or equal to zero likely */
#define MIPS32_FUNCT_BGEZL 0b00011
MIPS32_INS(BGEZL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BGEZL)
/* BGTZ - branch on greater than zero */
#define MIPS32_OP_BGTZ 0b000111
MIPS32_INS(BGTZ, I, .op = MIPS32_OP_BGTZ)
/* BGTZL - branch on greater than zero likely */
#define MIPS32_OP_BGTZL 0b010111
MIPS32_INS(BGTZL, I, .op = MIPS32_OP_BGTZL)
/* BLEZ - branch on less than or equal to zero */
#define MIPS32_OP_BLEZ 0b000110
MIPS32_INS(BLEZ, I, .op = MIPS32_OP_BLEZ)
/* BLEZL - branch on less than or equal to zero likely */
#define MIPS32_OP_BLEZL 0b010110
MIPS32_INS(BLEZL, I, .op = MIPS32_OP_BLEZL)
/* BLTZ - branch on less than zero */
#define MIPS32_FUNCT_BLTZ 0b00000
MIPS32_INS(BLTZ, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BLTZ)
/* BLTZAL - branch on less than zero and link */
#define MIPS32_FUNCT_BLTZAL 0b10000
MIPS32_INS(BLTZAL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BLTZAL)
/* BLTZALL - branch on less than zero and link likely */
#define MIPS32_FUNCT_BLTZALL 0b10010
MIPS32_INS(BLTZALL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BLTZALL)
/* BLTZL - branch on less than zero likely */
#define MIPS32_FUNCT_BLTZL 0b00010
MIPS32_INS(BLTZL, B, .op = MIPS32_OP_REGIMM, .funct = MIPS32_FUNCT_BLTZL)
/* BNE - branch on not equal */
#define MIPS32_OP_BNE 0b000101
MIPS32_INS(BNE, I, .op = MIPS32_OP_BNE)
/* BNEL - branch on not equal likely */
#define MIPS32_OP_BNEL 0b010101
MIPS32_INS(BNEL, I, .op = MIPS32_OP_BNEL)
/* DDIV - doubleword divide */
#define MIPS32_FUNCT_DDIV 0b011110
MIPS32_INS(DDIV, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_DDIV)
/* DDIVU - doubleword divide unsigned */
#define MIPS32_FUNCT_DDIVU 0b011111
MIPS32_INS(DDIVU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_DDIVU)
/* DIV - divide */
#define MIPS32_FUNCT_DIV 0b011010
MIPS32_INS(DIV, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_DIV)
/* DIVU - divide unsigned */
#define MIPS32_FUNCT_DIVU 0b011011
MIPS32_INS(DIVU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_DIVU)
/* J - jump */
#define MIPS32_OP_J 0b000010
MIPS32_INS(J, J, .op = MIPS32_OP_J)
/* JAL - jump and link */
#define MIPS32_OP_JAL 0b000011
MIPS32_INS(JAL, J, .op = MIPS32_OP_JAL)
/* JALR - jump and link register */
#define MIPS32_FUNCT_JALR 0b001001
MIPS32_INS(JALR, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_JALR)
/* JALX - jump and link exchange */
#define MIPS32_OP_JALX 0b011101
MIPS32_INS(JALX, J, .op = MIPS32_OP_JALX)
/* JR - jump register */
#define MIPS32_FUNCT_JR 0b001000
MIPS32_INS(JR, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_JR)
/* LB - load byte */
#define MIPS32_OP_LB 0b100000
MIPS32_INS(LB, I, .op = MIPS32_OP_LB)
/* LBU - load byte unsigned */
#define MIPS32_OP_LBU 0b100100
MIPS32_INS(LBU, I, .op = MIPS32_OP_LBU)
/* LH - load half */
#define MIPS32_OP_LH 0b100001
MIPS32_INS(LH, I, .op = MIPS32_OP_LH)
/* LHU - load half unsigned */
#define MIPS32_OP_LHU 0b100101
MIPS32_INS(LHU, I, .op = MIPS32_OP_LHU)
/* LUI - load upper immediate */
#define MIPS32_OP_LUI 0b001111
MIPS32_INS(LUI, I, .op = MIPS32_OP_LUI)
/* LW - load word */
#define MIPS32_OP_LW 0b100011
MIPS32_INS(LW, I, .op = MIPS32_OP_LW)
/* LWL - load word left */
#define MIPS32_OP_LWL 0b100010
MIPS32_INS(LWL, I, .op = MIPS32_OP_LWL)
/* LWR - load word right */
#define MIPS32_OP_LWR 0b100110
MIPS32_INS(LWR, I, .op = MIPS32_OP_LWR)
/* MFHI - move from hi */
#define MIPS32_FUNCT_MFHI 0b010000
MIPS32_INS(MFHI, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MFHI)
/* MFLO - move from hi */
#define MIPS32_FUNCT_MFLO 0b010010
MIPS32_INS(MFLO, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MFLO)
/* MTHI - move from hi */
#define MIPS32_FUNCT_MTHI 0b010001
MIPS32_INS(MTHI, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MTHI)
/* MTLO - move from hi */
#define MIPS32_FUNCT_MTLO 0b010011
MIPS32_INS(MTLO, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MTLO)
/* MULT - multiply */
#define MIPS32_FUNCT_MULT 0b011000
MIPS32_INS(MULT, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MULT)
/* MULTU - multiply unsigned */
#define MIPS32_FUNCT_MULTU 0b011001
MIPS32_INS(MULTU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_MULTU)
/* SB - store byte */
#define MIPS32_OP_SB 0b101000
MIPS32_INS(SB, I, .op = MIPS32_OP_SB)
/* SH - store half */
#define MIPS32_OP_SH 0b101001
MIPS32_INS(SH, I, .op = MIPS32_OP_SH)
/* SW - store word */
#define MIPS32_OP_SW 0b101011
MIPS32_INS(SW, I, .op = MIPS32_OP_SW)
/* SWL - store word left */
#define MIPS32_OP_SWL 0b101010
MIPS32_INS(SWL, I, .op = MIPS32_OP_SWL)
/* SWR - store word right */
#define MIPS32_OP_SWR 0b101110
MIPS32_INS(SWR, I, .op = MIPS32_OP_SWR)
/* SLL - shift left logical */
#define MIPS32_FUNCT_SLL 0b000000
MIPS32_INS(SLL, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SLL)
/* SLLV - shift left logical variable */
#define MIPS32_FUNCT_SLLV 0b000100
MIPS32_INS(SLLV, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SLLV)
/* SLT - set less then */
#define MIPS32_FUNCT_SLT 0b101010
MIPS32_INS(SLT, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SLT)
/* SLTI - set less then immediate */
#define MIPS32_OP_SLTI 0b001010
MIPS32_INS(SLTI, I, .op = MIPS32_OP_SLTI)
/* SLTIU - set less then imemdiate unsigned */
#define MIPS32_OP_SLTIU 0b001011
MIPS32_INS(SLTIU, I, .op = MIPS32_OP_SLTIU)
/* SLTU - set less than unsigned */
#define MIPS32_FUNCT_SLTU 0b101011
MIPS32_INS(SLTU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SLTU)
/* SRA - shift right arithmetic */
#define MIPS32_FUNCT_SRA 0b000011
MIPS32_INS(SRA, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SRA)
/* SRAV - shift right arithmetic variable */
#define MIPS32_FUNCT_SRAV 0b000111
MIPS32_INS(SRAV, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SRAV)
/* SRL - shift right logical */
#define MIPS32_FUNCT_SRL 0b000010
MIPS32_INS(SRL, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SRL)
/* SRLV - shift right logical variable */
#define MIPS32_FUNCT_SRLV 0b000110
MIPS32_INS(SRLV, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SRLV)
/* SUB - subtract */
#define MIPS32_FUNCT_SUB 0b100010
MIPS32_INS(SUB, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SUB)
/* SUBU - subtract unsigned */
#define MIPS32_FUNCT_SUBU 0b100011
MIPS32_INS(SUBU, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_SUBU)
/* OR - or */
#define MIPS32_FUNCT_OR 0b100101
MIPS32_INS(OR, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_OR)
/* ORI - or imemdiate */
#define MIPS32_OP_ORI 0b001101
MIPS32_INS(ORI, I, .op = MIPS32_OP_ORI)
/* NOR - not or */
#define MIPS32_FUNCT_NOR 0b100111
MIPS32_INS(NOR, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_NOR)
/* XOR - exclusive or */
#define MIPS32_FUNCT_XOR 0b100110
MIPS32_INS(XOR, R, .op = MIPS32_OP_SPECIAL, .funct = MIPS32_FUNCT_XOR)
/* XORI - exclusive or immediate */
#define MIPS32_OP_XORI 0b001110
MIPS32_INS(XORI, I, .op = MIPS32_OP_XORI)
};
#undef MIPS32_INS
/* mips32 directive types */
enum mips32_directive_type {
MIPS32_DIRECTIVE_ALIGN,
MIPS32_DIRECTIVE_SPACE,
MIPS32_DIRECTIVE_WORD,
MIPS32_DIRECTIVE_HALF,
MIPS32_DIRECTIVE_BYTE,
MIPS32_DIRECTIVE_SECTION,
};
/* mip32 directive */
struct mips32_directive {
enum mips32_directive_type type;
union {
uint16_t align;
uint16_t space;
uint32_t words[MAX_ARG_LENGTH];
uint16_t halfs[MAX_ARG_LENGTH];
uint8_t bytes[MAX_ARG_LENGTH];
char name[MAX_ARG_LENGTH];
};
};
#endif /* __MIPS32_H__ */

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __MLIMITS_H__
#define __MLIMITS_H__
/* Specifies how long a ident, register,
* instruction name, or any type of variable
* length text can be inside the lexer.
*/
#ifndef MAX_LEX_LENGTH
#define MAX_LEX_LENGTH 24
#endif
/* Specifices how many max arguments a
* given directive can hold
*/
#ifndef MAX_ARG_LENGTH
#define MAX_ARG_LENGTH 12
#endif
#endif /* __MLIMITS_H__ */

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#include <merror.h>
#include <stdarg.h>
#include <stdio.h>
char *current_file = "file.asm";
__attribute__((format(printf, 4, 5)))
void __log_impl_pos(int line, int column, int type, const char *format, ...)
{
va_list list;
va_start(list, format);
char *t = NULL;
switch (type) {
case __DEBUG:
t = "\033[34mdebug:\033[0m";
break;
case __WARNING:
t = "\033[35mwarning:\033[0m";
break;
case __ERROR:
t = "\033[31merror:\033[0m";
break;
}
printf("%s:%d:%d: %s ", current_file, line, column, t);
vprintf(format, list);
putchar('\n');
}
__attribute__((format(printf, 2, 3)))
void __log_impl(int type, const char *format, ...)
{
va_list list;
va_start(list, format);
char *t = NULL;
switch (type) {
case __DEBUG:
t = "\033[34mdebug:\033[0m";
break;
case __WARNING:
t = "\033[35mwarning:\033[0m";
break;
case __ERROR:
t = "\033[31merror:\033[0m";
break;
}
printf("%s ", t);
vprintf(format, list);
putchar('\n');
}

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# needed cflags
CFLAGS += -std=c2x
# add include directory
CFLAGS += -isystem ../include
INCLUDE += ../include
# add lib directory
SRC += ../lib
H_SRC = $(shell find $(SRC) $(INCLUDE) -type f -name "*.h")
C_SRC = $(shell find $(SRC) -type f -name "*.c")
C_OBJ = $(patsubst %.c,$(BIN)/%.o,$(C_SRC))
.PHONY: clean build run
build: $(BIN)/$(OUT)
clean:
rm -fr $(BIN)
run: build
$(BIN)/$(OUT)
$(C_OBJ): $(BIN)/%.o : %.c
@mkdir -p $(@D)
$(CC) -c $(CFLAGS) -o $@ $<
$(BIN)/$(OUT): $(C_OBJ) $(H_SRC)
@mkdir -p $(@D)
$(LD) $(LDFLAGS) -o $(BIN)/$(OUT) $(C_OBJ)

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#include <merror.h>
#include <mips.h>
#include <mips32.h>
#include <stdio.h>
#include <stdlib.h>
#include <elf.h>
#include <string.h>
#include <stddef.h>
#include "asm.h"
#include "mlimits.h"
#include "parse.h"
#include "parse_mips32.h"
extern char *current_file;
#define SHDR_STRTBL 0
#define SHDR_SYMTBL 1
#define SHDR_SECTIONS 2
static int parse_file(struct parser *parser)
{
while (1) {
struct expr expr;
if (parser_next(parser, &expr)) {
break;
}
if (expr.type == EXPR_INS)
if (sectbl_push(&parser->sec_tbl,
parser->sec_tbl.current, expr.ins))
return M_ERROR;
}
for (uint32_t i = 0; i < parser->ref_tbl.count; i++) {
struct reference *ref = &parser->ref_tbl.references[i];
struct symbol *sym;
struct mips32_instruction *ins;
if (symtbl_find(&parser->sym_tbl, &sym, ref->name)) {
ERROR("undefined symbol '%s'", ref->name);
return M_ERROR;
}
ins = &ref->section->ins[ref->index].mips32;
switch (ref->type) {
case REF_OFFESET:
ins->B_data.offset += sym->position -
(ref->section->start + ref->index);
break;
case REF_TARGET:
ins->J_data.target += sym->position;
break;
}
};
return M_SUCCESS;
}
static int assemble_phdr(struct assembler *asm, Elf32_Phdr **res,
uint32_t *res2)
{
struct parser *parser = asm->parser;
Elf32_Phdr *phdr = malloc(sizeof(Elf32_Phdr) *
parser->sec_tbl.count);
size_t ins_sz = sizeof(struct mips32_instruction);
if (phdr == NULL) {
ERROR("cannot alloc");
return M_ERROR;;
}
for (uint32_t i = 0; i < parser->sec_tbl.count; i++) {
Elf32_Phdr *hdr = &phdr[i];
struct section *sec = &parser->sec_tbl.sections[i];
hdr->p_type = PT_LOAD;
hdr->p_flags = PF_X | PF_W | PF_R; // FIXME: this is bad
hdr->p_offset = sec->start * ins_sz;
hdr->p_vaddr = sec->start * ins_sz;
hdr->p_paddr = 0x00;
hdr->p_filesz = sec->count * ins_sz;
hdr->p_memsz = sec->count * ins_sz;
hdr->p_align = sec->alignment;
}
*res = phdr;
*res2 = parser->sec_tbl.count;
return M_SUCCESS;
}
static int assemble_symtbl(struct assembler *asm, Elf32_Sym **res,
uint32_t *res2)
{
Elf32_Sym *stbl = malloc(sizeof(Elf32_Sym) * asm->parser->sym_tbl
.count);
if (stbl == NULL)
return M_ERROR;
for (uint32_t i = 0; i < asm->parser->sym_tbl.count; i++) {
struct symbol *sym = &asm->parser->sym_tbl.symbols[i];
size_t str_off;
if (strtbl_write_str(&asm->str_tbl, sym->name, &str_off)) {
free(stbl);
return M_ERROR;
}
int viz = STB_LOCAL;
switch (sym->flag) {
case SYM_LOCAL:
viz = STB_LOCAL;
break;
case SYM_GLOBAL:
case SYM_EXTERNAL:
viz = STB_GLOBAL;
break;
}
stbl[i] = (Elf32_Sym) {
.st_name = str_off,
.st_value = sym->position,
.st_size = 0,
.st_info = (unsigned char)
ELF32_ST_INFO(SYMINFO_BT_SELF,
SYMINFO_FLG_DIRECT),
.st_other = (unsigned char)
ELF32_ST_VISIBILITY(viz),
.st_shndx = 0, // FIXME: specify section
};
};
*res = stbl;
*res2 = asm->parser->sym_tbl.count;
return M_SUCCESS;
}
static int assemble_shdr(struct assembler *asm, Elf32_Shdr **res,
uint32_t *res2)
{
uint32_t entries = 2; // str table and sym tabel
entries += asm->parser->sec_tbl.count; // sections
Elf32_Shdr *shdr = malloc(sizeof(Elf32_Shdr) * entries);
size_t str_off;
if (strtbl_write_str(&asm->str_tbl, ".shstrtab", &str_off)) {
free(shdr);
return M_ERROR;
}
// string table
shdr[SHDR_STRTBL] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_STRTAB,
.sh_flags = SHF_STRINGS,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = 1,
.sh_entsize = 0,
};
if (strtbl_write_str(&asm->str_tbl, ".shsymtab", &str_off)) {
free(shdr);
return M_ERROR;
}
// symbol table
shdr[SHDR_SYMTBL] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_SYMTAB,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = 1,
.sh_entsize = sizeof(Elf32_Sym),
};
// for each section
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
struct section *sec = &asm->parser->sec_tbl.sections[i];
char name[MAX_LEX_LENGTH+1] = ".";
strcat(name, sec->name);
if (strtbl_write_str(&asm->str_tbl, name, &str_off)) {
free(shdr);
return M_ERROR;
}
shdr[i+SHDR_SECTIONS] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_PROGBITS,
.sh_flags = SHF_WRITE | SHF_ALLOC | SHF_EXECINSTR,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = sec->alignment,
.sh_entsize = sizeof(struct mips32_instruction),
};
}
*res = shdr;
*res2 = entries;
return M_SUCCESS;
}
static int assemble_file(struct assembler *asm)
{
Elf32_Phdr *phdr;
Elf32_Shdr *shdr;
Elf32_Sym *symtbl;
uint32_t phdr_len;
uint32_t shdr_len;
uint32_t symtbl_len;
if (assemble_symtbl(asm, &symtbl, &symtbl_len))
return M_ERROR;
if (assemble_phdr(asm, &phdr, &phdr_len)) {
free(symtbl);
return M_ERROR;
}
if (assemble_shdr(asm, &shdr, &shdr_len)) {
free(symtbl);
free(phdr);
return M_ERROR;
};
Elf32_Ehdr ehdr = {
.e_ident = {
[EI_MAG0] = ELFMAG0,
[EI_MAG1] = ELFMAG1,
[EI_MAG2] = ELFMAG2,
[EI_MAG3] = ELFMAG3,
[EI_CLASS] = ELFCLASS32,
[EI_DATA] = ELFDATA2LSB,
[EI_VERSION] = EV_CURRENT,
[EI_OSABI] = ELFOSABI_STANDALONE,
[EI_ABIVERSION] = 0x00,
[EI_PAD] = 0x00,
},
.e_type = ET_REL,
.e_machine = EM_MIPS,
.e_version = EV_CURRENT,
.e_entry = 0x00,
.e_phoff = 0x00,
.e_shoff = 0x00,
.e_flags = EF_MIPS_ARCH_32R6,
.e_ehsize = sizeof(Elf32_Ehdr),
.e_phentsize = 0x20,
.e_phnum = phdr_len,
.e_shentsize = 0x28,
.e_shnum = shdr_len,
.e_shstrndx = 0x00, // str table is always inx 0
};
uint32_t ptr = 0;
// we must now correct offets and sizes inside the ehdr, phdr,
// and shdr
ptr += sizeof(Elf32_Ehdr);
// phdr
ehdr.e_phoff = ptr;
ptr += phdr_len * sizeof(Elf32_Phdr);
// sections
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
phdr[i].p_offset = ptr;
phdr[i].p_vaddr = ptr;
shdr[i+SHDR_SECTIONS].sh_offset = ptr;
shdr[i+SHDR_SECTIONS].sh_size = phdr[i].p_filesz;
ptr += phdr[i].p_filesz;
}
// strtbl
shdr[SHDR_STRTBL].sh_offset = ptr;
shdr[SHDR_STRTBL].sh_size = asm->str_tbl.size;
ptr += asm->str_tbl.size;
// symtbl
ehdr.e_shoff = ptr;
shdr[SHDR_SYMTBL].sh_offset = ptr;
shdr[SHDR_SYMTBL].sh_size = symtbl_len * sizeof(Elf32_Sym);
ptr += symtbl_len * sizeof(Elf32_Sym);
FILE *out = fopen("/home/freya/out.o", "w");
// ehdr
fwrite(&ehdr, sizeof(Elf32_Ehdr), 1, out);
// phdr
fwrite(phdr, sizeof(Elf32_Phdr), phdr_len, out);
// sections
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
struct section *sec = &asm->parser->sec_tbl.sections[i];
for (uint32_t j = 0; j < sec->count; j++) {
struct mips32_instruction *ins = &sec->ins[j].mips32;
fwrite(ins, sizeof(struct mips32_instruction),
1, out);
}
}
// str tbl
fwrite(asm->str_tbl.ptr, asm->str_tbl.size, 1, out);
// sym tbl
fwrite(symtbl, sizeof(Elf32_Sym), symtbl_len, out);
// shdr
fwrite(shdr, sizeof(Elf32_Shdr), shdr_len, out);
fclose(out);
free(shdr);
free(phdr);
free(symtbl);
return M_SUCCESS;
}
int assemble_file_mips32(char *path)
{
struct lexer lexer;
struct parser parser;
current_file = path;
int res = M_SUCCESS;
if (lexer_init(current_file, &lexer))
return M_ERROR;
if (mips32_parser_init(&lexer, &parser))
return M_ERROR;
if (res == M_SUCCESS)
res = parse_file(&parser);
struct assembler assembler;
assembler.parser = &parser;
strtbl_init(&assembler.str_tbl);
if (res == M_SUCCESS)
res = assemble_file(&assembler);
strtbl_free(&assembler.str_tbl);
lexer_free(&lexer);
parser_free(&parser);
return res;
}

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include ../config.mk
SRC=.
BIN=../bin/masm
OUT=masm
include ../makefile.mk

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __ASM_H__
#define __ASM_H__
#include <stddef.h>
struct str_table {
char *ptr;
size_t size;
};
/* initalize a string table */
void strtbl_init(struct str_table *str_tbl);
/* free a string table */
void strtbl_free(struct str_table *str_tbl);
/* get a string form the string table */
int strtbl_get_str(struct str_table *str_tbl, const char *str, size_t *res);
/* get or append a string into the string table */
int strtbl_write_str(struct str_table *str_tbl, const char *str, size_t *res);
struct assembler {
struct parser *parser;
struct str_table str_tbl;
};
/* assemble a mips32 file*/
int assemble_file_mips32(char *path);
#endif /* __ASM_H__ */

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#include <merror.h>
#include <mips.h>
#include <mips32.h>
#include <stdio.h>
#include <stdlib.h>
#include <elf.h>
#include <string.h>
#include <stddef.h>
#include "asm.h"
#include "mlimits.h"
#include "parse.h"
#include "parse_mips32.h"
extern char *current_file;
#define SHDR_SYMTBL 0
#define SHDR_STRTBL 1
#define SHDR_SECTIONS 2
static int parse_file(struct parser *parser)
{
while (1) {
struct expr expr;
if (parser_next(parser, &expr)) {
break;
}
if (expr.type == EXPR_INS)
if (sectbl_push(&parser->sec_tbl,
parser->sec_tbl.current, expr.ins))
return M_ERROR;
}
for (uint32_t i = 0; i < parser->ref_tbl.count; i++) {
struct reference *ref = &parser->ref_tbl.references[i];
struct symbol *sym;
struct mips32_instruction *ins;
if (symtbl_find(&parser->sym_tbl, &sym, ref->name)) {
ERROR("undefined symbol '%s'", ref->name);
return M_ERROR;
}
ins = &ref->section->ins[ref->index].mips32;
switch (ref->type) {
case REF_OFFESET:
ins->B_data.offset += sym->position -
(ref->section->start + ref->index);
break;
case REF_TARGET:
ins->J_data.target += sym->position;
break;
}
};
return M_SUCCESS;
}
static int assemble_phdr(struct assembler *asm, Elf32_Phdr **res,
uint32_t *res2)
{
struct parser *parser = asm->parser;
Elf32_Phdr *phdr = malloc(sizeof(Elf32_Phdr) *
parser->sec_tbl.count);
size_t ins_sz = sizeof(struct mips32_instruction);
if (phdr == NULL) {
ERROR("cannot alloc");
return M_ERROR;;
}
for (uint32_t i = 0; i < parser->sec_tbl.count; i++) {
Elf32_Phdr *hdr = &phdr[i];
struct section *sec = &parser->sec_tbl.sections[i];
hdr->p_type = PT_LOAD;
hdr->p_flags = PF_X | PF_W | PF_R; // FIXME: this is bad
hdr->p_offset = sec->start * ins_sz;
hdr->p_vaddr = sec->start * ins_sz;
hdr->p_paddr = 0x00;
hdr->p_filesz = sec->count * ins_sz;
hdr->p_memsz = sec->count * ins_sz;
hdr->p_align = sec->alignment;
}
*res = phdr;
*res2 = parser->sec_tbl.count;
return M_SUCCESS;
}
static int assemble_symtbl(struct assembler *asm, Elf32_Sym **res,
uint32_t *res2)
{
Elf32_Sym *stbl = malloc(sizeof(Elf32_Sym) * asm->parser->sym_tbl
.count);
if (stbl == NULL)
return M_ERROR;
for (uint32_t i = 0; i < asm->parser->sym_tbl.count; i++) {
struct symbol *sym = &asm->parser->sym_tbl.symbols[i];
size_t str_off;
if (strtbl_write_str(&asm->str_tbl, sym->name, &str_off)) {
free(stbl);
return M_ERROR;
}
int viz = STB_LOCAL;
switch (sym->flag) {
case SYM_LOCAL:
viz = STB_LOCAL;
break;
case SYM_GLOBAL:
case SYM_EXTERNAL:
viz = STB_GLOBAL;
break;
}
stbl[i] = (Elf32_Sym) {
.st_name = str_off,
.st_value = sym->position,
.st_size = 0,
.st_info = (unsigned char)
ELF32_ST_INFO(SYMINFO_BT_SELF,
SYMINFO_FLG_DIRECT),
.st_other = (unsigned char)
ELF32_ST_VISIBILITY(viz),
.st_shndx = 0, // FIXME: specify section
};
};
*res = stbl;
*res2 = asm->parser->sym_tbl.count;
return M_SUCCESS;
}
static int assemble_shdr(struct assembler *asm, Elf32_Shdr **res,
uint32_t *res2)
{
uint32_t entries = 2; // str table and sym tabel
entries += asm->parser->sec_tbl.count; // sections
Elf32_Shdr *shdr = malloc(sizeof(Elf32_Shdr) * entries);
size_t str_off;
if (strtbl_write_str(&asm->str_tbl, ".shsymtab", &str_off)) {
free(shdr);
return M_ERROR;
}
// symbol table
shdr[SHDR_SYMTBL] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_SYMTAB,
.sh_flags = 0,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 1,
.sh_info = 0,
.sh_addralign = 1,
.sh_entsize = sizeof(Elf32_Sym),
};
if (strtbl_write_str(&asm->str_tbl, ".shstrtab", &str_off)) {
free(shdr);
return M_ERROR;
}
// string table
shdr[SHDR_STRTBL] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_STRTAB,
.sh_flags = SHF_STRINGS,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = 1,
.sh_entsize = 0,
};
// for each section
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
struct section *sec = &asm->parser->sec_tbl.sections[i];
char name[MAX_LEX_LENGTH+1] = ".";
strcat(name, sec->name);
if (strtbl_write_str(&asm->str_tbl, name, &str_off)) {
free(shdr);
return M_ERROR;
}
shdr[i+SHDR_SECTIONS] = (Elf32_Shdr) {
.sh_name = str_off,
.sh_type = SHT_PROGBITS,
.sh_flags = SHF_WRITE | SHF_ALLOC | SHF_EXECINSTR,
.sh_addr = 0,
.sh_offset = 0,
.sh_size = 0,
.sh_link = 0,
.sh_info = 0,
.sh_addralign = sec->alignment,
.sh_entsize = sizeof(struct mips32_instruction),
};
}
*res = shdr;
*res2 = entries;
return M_SUCCESS;
}
static int assemble_file(struct assembler *asm)
{
Elf32_Phdr *phdr;
Elf32_Shdr *shdr;
Elf32_Sym *symtbl;
uint32_t phdr_len;
uint32_t shdr_len;
uint32_t symtbl_len;
if (assemble_symtbl(asm, &symtbl, &symtbl_len))
return M_ERROR;
if (assemble_phdr(asm, &phdr, &phdr_len)) {
free(symtbl);
return M_ERROR;
}
if (assemble_shdr(asm, &shdr, &shdr_len)) {
free(symtbl);
free(phdr);
return M_ERROR;
};
Elf32_Ehdr ehdr = {
.e_ident = {
[EI_MAG0] = ELFMAG0,
[EI_MAG1] = ELFMAG1,
[EI_MAG2] = ELFMAG2,
[EI_MAG3] = ELFMAG3,
[EI_CLASS] = ELFCLASS32,
[EI_DATA] = ELFDATA2LSB,
[EI_VERSION] = EV_CURRENT,
[EI_OSABI] = ELFOSABI_NONE,
[EI_ABIVERSION] = 0x00,
[EI_PAD] = 0x00,
},
.e_type = ET_REL,
.e_machine = EM_MIPS,
.e_version = EV_CURRENT,
.e_entry = 0x00,
.e_phoff = 0x00,
.e_shoff = 0x00,
.e_flags = EF_MIPS_ARCH_32R6,
.e_ehsize = sizeof(Elf32_Ehdr),
.e_phentsize = sizeof(Elf32_Phdr),
.e_phnum = phdr_len,
.e_shentsize = sizeof(Elf32_Shdr),
.e_shnum = shdr_len,
.e_shstrndx = SHDR_STRTBL,
};
uint32_t ptr = 0;
// we must now correct offets and sizes inside the ehdr, phdr,
// and shdr
ptr += sizeof(Elf32_Ehdr);
// phdr
ehdr.e_phoff = ptr;
ptr += phdr_len * sizeof(Elf32_Phdr);
// sections
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
phdr[i].p_offset = ptr;
phdr[i].p_vaddr = ptr;
shdr[i+SHDR_SECTIONS].sh_offset = ptr;
shdr[i+SHDR_SECTIONS].sh_size = phdr[i].p_filesz;
ptr += phdr[i].p_filesz;
}
// symtbl
shdr[SHDR_SYMTBL].sh_offset = ptr;
shdr[SHDR_SYMTBL].sh_size = symtbl_len * sizeof(Elf32_Sym);
ptr += symtbl_len * sizeof(Elf32_Sym);
// strtbl
shdr[SHDR_STRTBL].sh_offset = ptr;
shdr[SHDR_STRTBL].sh_size = asm->str_tbl.size;
ptr += asm->str_tbl.size;
// shdr
ehdr.e_shoff = ptr;
FILE *out = fopen("out.o", "w");
// ehdr
fwrite(&ehdr, sizeof(Elf32_Ehdr), 1, out);
// phdr
fwrite(phdr, sizeof(Elf32_Phdr), phdr_len, out);
// sections
for (uint32_t i = 0; i < asm->parser->sec_tbl.count; i++) {
struct section *sec = &asm->parser->sec_tbl.sections[i];
for (uint32_t j = 0; j < sec->count; j++) {
struct mips32_instruction *ins = &sec->ins[j].mips32;
fwrite(ins, sizeof(struct mips32_instruction),
1, out);
}
}
// sym tbl
fwrite(symtbl, sizeof(Elf32_Sym), symtbl_len, out);
// str tbl
fwrite(asm->str_tbl.ptr, asm->str_tbl.size, 1, out);
// shdr
fwrite(shdr, sizeof(Elf32_Shdr), shdr_len, out);
fclose(out);
free(shdr);
free(phdr);
free(symtbl);
return M_SUCCESS;
}
int assemble_file_mips32(char *path)
{
struct lexer lexer;
struct parser parser;
current_file = path;
int res = M_SUCCESS;
if (lexer_init(current_file, &lexer))
return M_ERROR;
if (mips32_parser_init(&lexer, &parser))
return M_ERROR;
if (res == M_SUCCESS)
res = parse_file(&parser);
struct assembler assembler;
assembler.parser = &parser;
strtbl_init(&assembler.str_tbl);
if (res == M_SUCCESS)
res = assemble_file(&assembler);
strtbl_free(&assembler.str_tbl);
lexer_free(&lexer);
parser_free(&parser);
return res;
}

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#include "lex.h"
#include <mlimits.h>
#include <merror.h>
static struct {
int x;
int y;
} pos;
/* get next char in lexer */
static int lex_next(struct lexer *lexer)
{
if (lexer->peek != EOF) {
int c = lexer->peek;
lexer->peek = EOF;
return c;
}
int c = getc(lexer->file);
if (c == '\n') {
lexer->x = 0;
lexer->y++;
} else {
lexer->x++;
}
return c;
}
/* peek next char in lexer */
static int lex_peek(struct lexer *lexer)
{
if (lexer->peek == EOF)
lexer->peek = lex_next(lexer);
return lexer->peek;
}
/* skip all characters until EOF or newline */
static void skip_comment(struct lexer *lexer)
{
int c;
while (1) {
c = lex_next(lexer);
if (c == EOF || c == '\n')
break;
}
}
/* lexes text until whitespace
* returns error on zero length or too long */
static int lex_ident(struct lexer *lexer, char text[MAX_LEX_LENGTH])
{
int len = 0;
char *ptr = text;
int c;
while (1) {
c = lex_peek(lexer);
if (!(
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') ||
(c == '_')
)) {
break;
}
// pop char out of lexer
lex_next(lexer);
if (len + 1 == MAX_LEX_LENGTH) {
ERROR_POS(pos, "ident has max length of %d",
MAX_LEX_LENGTH);
return M_ERROR;
}
*ptr++ = c;
len++;
}
if (len == 0) {
ERROR_POS(pos, "attempted to lex empty ident %d",
MAX_LEX_LENGTH);
return M_ERROR;
}
*ptr = '\0';
return M_SUCCESS;
}
/* lexes a string until closing quote
* returns error if string is too long or hit newline */
static int lex_string(struct lexer *lexer,char text[MAX_LEX_LENGTH])
{
int len = 0;
char *ptr = text;
int c;
while (1) {
c = lex_next(lexer);
if (c == '"')
break;
// match escape character
if (c == '\\') {
switch (lex_peek(lexer)) {
case 'n':
c = '\n';
lex_next(lexer);
break;
case 't':
c = '\t';
lex_next(lexer);
break;
case '\\':
c = '\\';
lex_next(lexer);
break;
case '"':
c = '"';
lex_next(lexer);
break;
}
}
// strings cannot span multiple lines
if (c == '\n') {
ERROR_POS(pos, "reached newline before end of string");
return M_ERROR;
}
if (len + 1 == MAX_LEX_LENGTH) {
ERROR_POS(pos, "string has max length of %d",
MAX_LEX_LENGTH);
return M_ERROR;
}
*ptr++ = c;
len++;
}
*ptr = '\0';
return M_SUCCESS;
}
/* lexes a integer number in base 2,8,10, or 16,
* uses base 10 by default but chan be changed by 0b, 0o, and 0x */
static int lex_number(struct lexer *lexer, int64_t *n)
{
int64_t number = 0;
int base = 10;
// skip all leading zeros, they dont do anything.
// this also allows us to directly check for 0b, 0o, and 0x
// right away!
while (1) {
if (lex_peek(lexer) == '0')
lex_next(lexer);
else
break;
}
// match change of base
switch (lex_peek(lexer)) {
case 'b':
base = 2;
lex_next(lexer);
break;
case 'o':
base = 8;
lex_next(lexer);
break;
case 'x':
base = 16;
lex_next(lexer);
break;
}
while (1) {
char c = lex_peek(lexer);
int n = 0;
if (c >= '0' && c <= '9') {
n = c - '0';
} else if (c >= 'a' && c <= 'z') { // match A-Z so we can
n = c - 'a' + 10; // catch the errors
} else if (c >= 'A' && c <= 'Z') { // here instead of later
n = c - 'A' + 10;
} else {
break; // no longer a number
}
// if number provided is bigger than my base,
// error !
if (n >= base) {
ERROR_POS(pos, "character '%c' is bigger than number base"
"'%d'", c, base);
return M_ERROR;
}
lex_next(lexer);
number *= base;
number += n;
}
*n = number;
return M_SUCCESS;
}
/* lex the next token on the file */
int lexer_next(struct lexer *lexer, struct token *token)
{
again: // use label to avoid whitespace recursion
token->x = lexer->x;
token->y = lexer->y;
pos.x = lexer->x;
pos.y = lexer->y;
token->type = TOK_EOF;
int c = lex_peek(lexer);
int res = M_SUCCESS;
switch (c) {
case EOF:
case '\0':
token->type = TOK_EOF;
break;
case ';':
case '#':
skip_comment(lexer);
goto again;
case ' ':
case '\t':
// skip white space
lex_next(lexer);
goto again;
case '\n':
lex_next(lexer);
token->type = TOK_NL;
break;
case ',':
lex_next(lexer);
token->type = TOK_COMMA;
break;
case '=':
lex_next(lexer);
token->type = TOK_EQUAL;
break;
case '(':
lex_next(lexer);
token->type = TOK_LPAREN;
break;
case ')':
token->type = TOK_RPAREN;
lex_next(lexer);
break;
case '$':
token->type = TOK_REG;
lex_next(lexer);
res = lex_ident(lexer, token->text);
break;
case '.':
token->type = TOK_DIRECTIVE;
lex_next(lexer);
res = lex_ident(lexer, token->text);
break;
case '"':
token->type = TOK_STRING;
lex_next(lexer);
res = lex_string(lexer, token->text);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
token->type = TOK_NUMBER;
res = lex_number(lexer, &token->number);
break;
default:
token->type = TOK_IDENT;
res = lex_ident(lexer, token->text);
if (lex_peek(lexer) == ':') {
lex_next(lexer);
token->type = TOK_LABEL;
}
break;
}
return res;
}
int lexer_init(const char *path, struct lexer *lexer)
{
FILE *file = fopen(path, "r");
if (file == NULL) {
ERROR_POS(pos, "cannot file '%s'", path);
return M_ERROR;
}
lexer->file = file;
lexer->peek = EOF;
lexer->x = 0;
lexer->y = 0;
return M_SUCCESS;
}
int lexer_free(struct lexer *lexer)
{
return fclose(lexer->file);
}
char *token_str(enum token_type type)
{
switch (type) {
case TOK_IDENT:
return "ident";
case TOK_REG:
return "register";
case TOK_LABEL:
return "label";
case TOK_STRING:
return "string";
case TOK_COMMA:
return "comma";
case TOK_EQUAL:
return "equal";
case TOK_LPAREN:
return "left parentheses";
case TOK_RPAREN:
return "right parentheses";
case TOK_NUMBER:
return "number";
case TOK_EOF:
return "end of file";
case TOK_NL:
return "new line";
case TOK_DIRECTIVE:
return "directive";
}
return "unknown";
}

55
masm/lex.h Normal file
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/* Copyright (c) 2024 Freya Murphy */
#ifndef __LEX_H__
#define __LEX_H__
#include <mlimits.h>
#include <stdio.h>
#include <stdint.h>
struct lexer {
FILE *file;
int peek;
int x;
int y;
};
enum token_type {
TOK_IDENT,
TOK_REG,
TOK_LABEL,
TOK_STRING,
TOK_COMMA,
TOK_EQUAL,
TOK_LPAREN,
TOK_RPAREN,
TOK_NUMBER,
TOK_EOF,
TOK_NL,
TOK_DIRECTIVE,
};
struct token {
enum token_type type;
union {
int64_t number;
char text[MAX_LEX_LENGTH];
};
int x;
int y;
};
/* initalize a lexer */
int lexer_init(const char *file, struct lexer *lexer);
/* free the lxer */
int lexer_free(struct lexer *lexer);
/* lexes the next token, returns M_ERROR on error,
* and TOK_EOF on EOF */
int lexer_next(struct lexer *lexer, struct token *token);
/* token type to string */
char *token_str(enum token_type);
#endif /* __LEX_H__ */

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#include "asm.h"
int main(int argc, char **argv) {
if (argc != 2)
return 0;
return assemble_file_mips32(argv[1]);
}

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#include <mlimits.h>
#include <merror.h>
#include <stdio.h>
#include <string.h>
#include "parse.h"
#include "lex.h"
int next_token(struct parser *parser, struct token *tok)
{
if (parser->peek.type != TOK_EOF) {
if (tok != NULL)
*tok = parser->peek;
parser->peek.type = TOK_EOF;
return M_SUCCESS;
}
struct token token;
if (lexer_next(parser->lexer, &token))
return M_ERROR;
if (tok != NULL)
*tok = token;
return M_SUCCESS;
}
int peek_token(struct parser *parser, struct token *tok)
{
if (parser->peek.type == TOK_EOF) {
if (next_token(parser, &parser->peek))
return M_ERROR;
}
if (tok != NULL)
*tok = parser->peek;
return M_SUCCESS;
}
int assert_token(struct parser *parser, enum token_type type,
struct token *tok)
{
struct token token;
if (next_token(parser, &token))
return M_ERROR;
if (token.type != type) {
ERROR_POS(token, "expected a token of type '%s', got '%s'",
token_str(type), token_str(token.type));
return M_ERROR;
}
if (tok != NULL)
*tok = token;
return M_SUCCESS;
}
int assert_eol(struct parser *parser)
{
struct token token;
if (next_token(parser, &token))
return M_ERROR;
if (token.type != TOK_NL && token.type != TOK_EOF) {
ERROR_POS(token, "expected a new line or end of file");
return M_ERROR;
}
return M_SUCCESS;
}
static int parse_constant(struct parser *parser, struct const_expr *expr,
struct token ident)
{
struct token number;
if (assert_token(parser, TOK_EQUAL, NULL))
return M_ERROR;
if (assert_token(parser, TOK_NUMBER, &number))
return M_ERROR;
strcpy(expr->name,ident.text);
expr->value = number.number;
return M_SUCCESS;
}
static int parser_handle_ident(struct parser *parser, struct expr *expr)
{
struct token ident;
struct token peek;
if (assert_token(parser, TOK_IDENT, &ident))
return M_ERROR;
if (peek_token(parser, &peek))
return M_ERROR;
if (peek.type == TOK_EQUAL) {
expr->type = EXPR_CONSTANT;
return parse_constant(parser, &expr->constant, ident);
} else {
expr->type = EXPR_INS;
return parser->parse_instruction(parser, &expr->ins, ident);
}
}
static int parse_label(struct parser *parser,
struct expr *expr)
{
struct token token;
struct symbol symbol;
uint32_t index;
if (assert_token(parser, TOK_LABEL, &token))
return M_ERROR;
strcpy(expr->text, token.text);
if (symtbl_find(&parser->sym_tbl, NULL, token.text) == M_SUCCESS) {
ERROR_POS(token, "redefined symbol '%s'", token.text);
return M_ERROR;
}
index = parser->sec_tbl.current->start +
parser->sec_tbl.current->count;
symbol = (struct symbol) {
.name = "",
.position = index,
.flag = SYM_LOCAL,
};
strcpy(symbol.name, token.text);
if (symtbl_push(&parser->sym_tbl, symbol))
return M_ERROR;
return M_SUCCESS;
}
int parser_next(struct parser *parser, struct expr *expr)
{
struct token token;
int res = M_SUCCESS;
again:
if (peek_token(parser, &token))
return M_ERROR;
switch (token.type) {
case TOK_NL:
next_token(parser, NULL);
goto again;
case TOK_EOF:
res = M_EOF;
break;
case TOK_LABEL:
expr->type = EXPR_LABEL;
res = parse_label(parser, expr);
break;
case TOK_DIRECTIVE:
expr->type = EXPR_DIRECTIVE;
res = parser->parse_directive(parser,
&expr->directive);
break;
case TOK_IDENT:
res = parser_handle_ident(parser, expr);
break;
default:
ERROR_POS(token, "unexpected token '%s'",
token_str(token.type));
return M_ERROR;
}
return res;
}
int parser_init(struct lexer *lexer, struct parser *parser)
{
parser->lexer = lexer;
parser->peek.type = TOK_EOF;
if (symtbl_init(&parser->sym_tbl))
return M_ERROR;
if (sectbl_init(&parser->sec_tbl))
return M_ERROR;
if (reftbl_init(&parser->ref_tbl))
return M_ERROR;
return M_SUCCESS;
}
void parser_free(struct parser *parser)
{
symtbl_free(&parser->sym_tbl);
sectbl_free(&parser->sec_tbl);
reftbl_free(&parser->ref_tbl);
}

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/* Copyright (c) 2024 Freya Murphy */
#ifndef __PARSE_H__
#define __PARSE_H__
#include "lex.h"
#include <mlimits.h>
#include <mips.h>
#include <stdint.h>
struct const_expr {
char name[MAX_LEX_LENGTH];
uint32_t value;
};
enum expr_type {
EXPR_INS,
EXPR_DIRECTIVE,
EXPR_CONSTANT,
EXPR_SEGMENT,
EXPR_LABEL,
};
struct expr {
enum expr_type type;
union {
// instruction
union mips_instruction ins;
// directive
union mips_directive directive;
// constant
struct const_expr constant;
// segment or label
char text[MAX_LEX_LENGTH];
};
};
enum symbol_flag {
SYM_LOCAL,
SYM_GLOBAL,
SYM_EXTERNAL,
};
struct symbol {
char name[MAX_LEX_LENGTH];
uint32_t position;
enum symbol_flag flag;
};
struct symbol_table {
uint32_t count;
uint32_t len;
struct symbol *symbols;
};
int symtbl_init(struct symbol_table *sym_tbl);
void symtbl_free(struct symbol_table *sym_tbl);
int symtbl_push(struct symbol_table *sym_tbl, struct symbol sym);
int symtbl_find(struct symbol_table *sym_tbl, struct symbol **sym,
const char name[MAX_LEX_LENGTH]);
struct section {
uint32_t count;
uint32_t len;
uint32_t start;
uint32_t alignment;
union mips_instruction *ins;
char name[MAX_LEX_LENGTH];
};
struct section_table {
uint32_t count;
uint32_t len;
struct section *sections;
struct section *current;
char name[MAX_LEX_LENGTH];
uint32_t total_ins;
};
int sectbl_init(struct section_table *sec_tbl);
void sectbl_free(struct section_table *sec_tbl);
int sectbl_alloc(struct section_table *sec_tbl, struct section **sec,
const char name[MAX_LEX_LENGTH]);
int sectbl_push(struct section_table *sec_tbl, struct section *section,
union mips_instruction ins);
int sectbl_get(struct section_table *sec_tbl, struct section **sec,
const char name[MAX_LEX_LENGTH]);
enum reference_type {
REF_OFFESET,
REF_TARGET,
};
struct reference {
enum reference_type type;
struct section *section;
uint32_t index;
char name[MAX_LEX_LENGTH];
};
struct reference_table {
uint32_t count;
uint32_t len;
struct reference *references;
};
int reftbl_init(struct reference_table *ref_tbl);
void reftbl_free(struct reference_table *ref_tbl);
int reftbl_push(struct reference_table *ref_tbl, struct reference reference);
struct parser {
struct lexer *lexer;
struct token peek;
// sections
struct section_table sec_tbl;
// symbols
struct symbol_table sym_tbl;
// references
struct reference_table ref_tbl;
int (*parse_instruction)(struct parser *, union mips_instruction *,
struct token);
int (*parse_directive)(struct parser *, union mips_directive *);
int (*is_instruction)(const char *ident);
};
/* get the next token in the parser */
int next_token(struct parser *parser, struct token *tok);
/* peek the next token in the parser */
int peek_token(struct parser *parser, struct token *tok);
/* assert the next token is a specific type */
int assert_token(struct parser *parser, enum token_type type,
struct token *tok);
/* assert the next token is EOF or NL */
int assert_eol(struct parser *parser);
/* get the next expression in the parser */
int parser_next(struct parser *parser, struct expr *expr);
/* initalize the base parser */
int parser_init(struct lexer *lexer, struct parser *parser);
/* free the base parser */
void parser_free(struct parser *parser);
#endif /* __PARSE_H__ */

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masm/parse_mips32.c Normal file
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#include <mips.h>
#include <mips32.h>
#include <merror.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include "parse_mips32.h"
#include "parse.h"
#include "mlimits.h"
#include "parse.h"
#include "lex.h"
/* each instruction has a given parse format
* internal to the parser */
enum mips32_parse_format {
// register type: rs, rt, td
MIPS32_PARSE_R,
// register type: rs, rt
MIPS32_PARSE_R2,
// register type: rd
MIPS32_PARSE_RD,
// register type: rs
MIPS32_PARSE_RS,
// imeediate type: rs, rt, immd
MIPS32_PARSE_I,
// jump type: offset
MIPS32_PARSE_J,
// jump type: register
MIPS32_PARSE_JR,
// offset 16b type: offset
MIPS32_PARSE_O16,
// offset 26b type: offset
MIPS32_PARSE_O26,
// breanch equal type: rs, rt, offset
MIPS32_PARSE_BE,
// branch zero type: rs, offset
MIPS32_PARSE_BZ,
// store and load: rt, offset(base)
MIPS32_PARSE_SL,
// store and load immediate: rt, immediate
MIPS32_PARSE_SLI,
// shift: rd, rt, sa
MIPS32_PARSE_S,
// shift variable: rd, rt, rs
MIPS32_PARSE_SV,
};
#define FORMAT(ins, format) \
[MIPS32_INS_##ins] = MIPS32_PARSE_##format, \
const enum mips32_parse_format mips32_parse_formats[] = {
FORMAT(ADD, R)
FORMAT(ADDI, I)
FORMAT(ADDIU, I)
FORMAT(ADDU, R)
FORMAT(AND, R)
FORMAT(ANDI, I)
FORMAT(BAL, O16)
FORMAT(BALC, O26)
FORMAT(BC, O26)
FORMAT(BEQ, BE)
FORMAT(BEQL, BE)
FORMAT(BGEZ, BZ)
FORMAT(BGEZAL, BZ)
FORMAT(BGEZALL, BZ)
FORMAT(BGEZL, BZ)
FORMAT(BGTZ, BZ)
FORMAT(BGTZL, BZ)
FORMAT(BLEZ, BZ)
FORMAT(BLEZL, BZ)
FORMAT(BLTZ, BZ)
FORMAT(BLTZAL, BZ)
FORMAT(BLTZALL, BZ)
FORMAT(BLTZL, BZ)
FORMAT(BNE, BE)
FORMAT(BNEL, BE)
FORMAT(DDIV, R2)
FORMAT(DDIVU, R2)
FORMAT(DIV, R2)
FORMAT(DIVU, R2)
FORMAT(J, J)
FORMAT(JAL, J)
FORMAT(JALR, JR) // TODO: handle rd
FORMAT(JALX, J)
FORMAT(JR, JR)
FORMAT(LB, SL)
FORMAT(LBU, SL)
FORMAT(LH, SL)
FORMAT(LHU, SL)
FORMAT(LUI, SLI)
FORMAT(LW, SL)
FORMAT(LWL, SL)
FORMAT(LWR, SL)
FORMAT(MFHI, RD)
FORMAT(MFLO, RD)
FORMAT(MTHI, RS)
FORMAT(MTLO, RS)
FORMAT(MULT, R2)
FORMAT(MULTU, R2)
FORMAT(SB, SL)
FORMAT(SH, SL)
FORMAT(SW, SL)
FORMAT(SWL, SL)
FORMAT(SLL, S)
FORMAT(SLLV, SV)
FORMAT(SLT, R)
FORMAT(SLTI, I)
FORMAT(SLTIU, I)
FORMAT(SLTU, R)
FORMAT(SRA, S)
FORMAT(SRAV, SV)
FORMAT(SRL, S)
FORMAT(SRLV, SV)
FORMAT(OR, R)
FORMAT(ORI, I)
FORMAT(NOR, R)
FORMAT(SUB, R)
FORMAT(SUBU, R)
FORMAT(XOR, R)
FORMAT(XORI, I)
};
#undef FORMAT
#define MAX5 32
#define MAX16 65536
#define MAX26 67108864
static int get_reference(struct parser *parser, uint32_t *offset,
enum reference_type type)
{
struct token token;
if (next_token(parser, &token))
return M_ERROR;
if (token.type == TOK_NUMBER) {
*offset = token.number;
return M_SUCCESS;
}
if (token.type != TOK_IDENT) {
ERROR_POS(token, "unexpected token of type '%s'",
token_str(token.type));
return M_ERROR;
}
struct reference reference = {
.section = parser->sec_tbl.current,
.index = parser->sec_tbl.current->count,
.type = type,
};
strcpy(reference.name, token.text);
if (reftbl_push(&parser->ref_tbl, reference))
return M_ERROR;
*offset = 0;
return M_SUCCESS;
}
static int get_offset(struct parser *parser, uint32_t *offset)
{
return get_reference(parser, offset, REF_OFFESET);
}
static int get_target(struct parser *parser, uint32_t *offset)
{
return get_reference(parser, offset, REF_TARGET);
}
static int get_instruction(const char *ident, struct mips32_instruction *res)
{
for (int i = 0; i < __MIPS32_INS_LEN; i++) {
struct mips32_instruction ins =
mips32_instructions[i];
if (strcasecmp(ident, ins.name) == 0) {
if (res != NULL)
*res = ins;
return M_SUCCESS;
}
}
return M_ERROR;
}
static int is_instruction(const char *ident)
{
return get_instruction(ident, NULL);
}
static int parse_register(struct parser *parser, enum mips32_register *reg)
{
struct token token;
if (assert_token(parser, TOK_REG, &token))
return M_ERROR;
int len = strlen(token.text);
int c0 = len > 0 ? token.text[0] : '\0',
c1 = len > 1 ? token.text[1] : '\0',
c2 = len > 2 ? token.text[2] : '\0',
c3 = len > 3 ? token.text[3] : '\0';
// $zero
if (c0 == 'z') {
if (c1 == 'e' && c2 == 'r' && c3 == 'o') {
*reg = MIPS32_REG_ZERO;
return M_SUCCESS;
}
}
// $a0-a3 $at
else if (c0 == 'a') {
if (c1 == 't') {
*reg = MIPS32_REG_AT;
return M_SUCCESS;
}
if (c1 >= '0' && c1 <= '3') {
*reg = MIPS32_REG_A0;
*reg += c1 - '0';
return M_SUCCESS;
}
}
// $v0-v1
else if (c0 == 'v') {
if (c1 >= '0' && c1 <= '1') {
*reg = MIPS32_REG_V0;
*reg += c1 - '0';
return M_SUCCESS;
}
}
// $t0-t9
else if (c0 == 't') {
if (c1 >= '0' && c1 <= '7') {
*reg = MIPS32_REG_T0;
*reg += c1 - '0';
return M_SUCCESS;
}
// reg T8-T9 are not in order with T0-T7
if (c1 >= '8' && c1 <= '9') {
*reg = MIPS32_REG_T8;
*reg += c1 - '8';
return M_SUCCESS;
}
}
// $s0-s7 $sp
else if (c0 == 's') {
if (c1 >= '0' && c1 <= '7') {
*reg = MIPS32_REG_S0;
*reg += c1 - '0';
return M_SUCCESS;
}
if (c1 == 'p') {
*reg = MIPS32_REG_SP;
return M_SUCCESS;
}
}
// $k0-k1
else if (c0 == 'k') {
if (c1 >= '0' && c1 <= '1') {
*reg = MIPS32_REG_K0;
*reg += c1 - '0';
return M_SUCCESS;
}
}
// $gp
else if (c0 == 'g') {
if (c1 == 'p') {
*reg = MIPS32_REG_GP;
return M_SUCCESS;
}
}
// $fp
else if (c0 == 'f') {
if (c1 == 'p') {
*reg = MIPS32_REG_FP;
return M_SUCCESS;
}
}
// $rp
else if (c0 == 'r') {
if (c1 == 'p') {
*reg = MIPS32_REG_RA;
return M_SUCCESS;
}
}
// $0-31 (non aliased register names)
else if (c0 >= '0' && c0 <= '9') {
int i = c0 - '0';
if (c1 >= '0' && c1 <= '9') {
i *= 10;
i += c1 - '0';
}
if (i <= 31) {
*reg = i;
return M_SUCCESS;
}
}
ERROR_POS(token, "unknown register $%s", token.text);
return M_ERROR;
}
static int parse_instruction_r(struct parser *parser,
struct mips32_instruction *ins)
{
// format: rs, rt, rd
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rd = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rs = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rt = reg;
return M_SUCCESS;
}
static int parse_instruction_r2(struct parser *parser,
struct mips32_instruction *ins)
{
// format: rs, rt
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rs = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rt = reg;
return M_SUCCESS;
}
static int parse_instruction_rs(struct parser *parser,
struct mips32_instruction *ins)
{
// format: rs
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rs = reg;
return M_SUCCESS;
}
static int parse_instruction_rd(struct parser *parser,
struct mips32_instruction *ins)
{
// format: rd
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rd = reg;
return M_SUCCESS;
}
static int parse_instruction_i(struct parser *parser,
struct mips32_instruction *ins)
{
// format: rs, rt, immd
enum mips32_register reg;
struct token token;
if (parse_register(parser, &reg))
return M_ERROR;
ins->I_data.rt = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->I_data.rs = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (assert_token(parser, TOK_NUMBER, &token))
return M_ERROR;
if (token.number >= MAX16)
return M_ERROR;
ins->I_data.immd = token.number;
return M_SUCCESS;
}
static int parse_instruction_offset(struct parser *parser,
uint32_t max,
struct mips32_instruction *ins)
{
uint32_t n;
if (get_offset(parser, &n) || n > max)
return M_ERROR;
switch (max) {
case MAX26:
ins->J_data.target = n;
break;
case MAX16:
ins->B_data.offset = n;
break;
}
return M_SUCCESS;
}
static int parse_instruction_j(struct parser *parser,
struct mips32_instruction *ins)
{
uint32_t n;
if (get_target(parser, &n) || n > MAX26)
return M_ERROR;
ins->J_data.target = n;
return M_SUCCESS;
}
static int parse_instruction_jr(struct parser *parser,
struct mips32_instruction *ins)
{
uint32_t n;
if (get_target(parser, &n) || n > MAX26)
return M_ERROR;
ins->J_data.target = n;
return M_SUCCESS;
}
static int parse_instruction_branch_equal(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rs = reg;
return M_SUCCESS;
}
static int parse_instruction_branch(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
uint32_t n;
if (parse_register(parser, &reg))
return M_ERROR;
ins->B_data.rs = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (get_offset(parser, &n) || n > MAX16)
return M_ERROR;
ins->B_data.offset = n;
return M_SUCCESS;
}
static int parse_instruction_sl(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
uint32_t offset = 0;
struct token token;
if (parse_register(parser, &reg))
return M_ERROR;
ins->I_data.rt = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (peek_token(parser, &token))
return M_ERROR;
if (token.type != TOK_LPAREN)
if (get_offset(parser, &offset))
return M_ERROR;
ins->I_data.immd = offset;
if (peek_token(parser, &token))
return M_ERROR;
if (token.type == TOK_NL) {
ins->I_data.rs = MIPS32_REG_ZERO;
return M_SUCCESS;
}
if (assert_token(parser, TOK_LPAREN, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->I_data.rs = reg;
if (assert_token(parser, TOK_RPAREN, NULL))
return M_ERROR;
return M_SUCCESS;
}
static int parse_instruction_sli(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
struct token token;
if (parse_register(parser, &reg))
return M_ERROR;
ins->I_data.rt = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (assert_token(parser, TOK_NUMBER, &token) || token.number > MAX16)
return M_ERROR;
ins->I_data.immd = token.number;
return M_SUCCESS;
}
static int parse_instruction_s(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
struct token token;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rd = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rt = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (assert_token(parser, TOK_NUMBER, &token) || token.number > MAX5)
return M_ERROR;
ins->R_data.shamt = token.number;
return M_SUCCESS;
}
static int parse_instruction_sv(struct parser *parser,
struct mips32_instruction *ins)
{
enum mips32_register reg;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rd = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rt = reg;
if (assert_token(parser, TOK_COMMA, NULL))
return M_ERROR;
if (parse_register(parser, &reg))
return M_ERROR;
ins->R_data.rs = reg;
return M_SUCCESS;
}
static int parse_instruction(struct parser *parser,
union mips_instruction *ins,
struct token ident)
{
struct mips32_instruction instruction;
enum mips32_parse_format format;
int res = M_SUCCESS;
if (get_instruction(ident.text, &instruction)) {
ERROR_POS(ident, "unknown instruction '%s'", ident.text);
return M_ERROR;
}
ins->mips32 = instruction;
format = mips32_parse_formats[instruction.type];
switch (format) {
case MIPS32_PARSE_R:
res = parse_instruction_r(parser, &ins->mips32);
break;
case MIPS32_PARSE_R2:
res = parse_instruction_r2(parser, &ins->mips32);
break;
case MIPS32_PARSE_RS:
res = parse_instruction_rs(parser, &ins->mips32);
break;
case MIPS32_PARSE_RD:
res = parse_instruction_rd(parser, &ins->mips32);
break;
case MIPS32_PARSE_I:
res = parse_instruction_i(parser, &ins->mips32);
break;
case MIPS32_PARSE_J:
res = parse_instruction_j(parser, &ins->mips32);
break;
case MIPS32_PARSE_JR:
res = parse_instruction_jr(parser, &ins->mips32);
break;
case MIPS32_PARSE_O16:
res = parse_instruction_offset(parser, MAX16, &ins->mips32);
break;
case MIPS32_PARSE_O26:
res = parse_instruction_offset(parser, MAX26, &ins->mips32);
break;
case MIPS32_PARSE_BE:
res = parse_instruction_branch_equal(parser, &ins->mips32);
break;
case MIPS32_PARSE_BZ:
res = parse_instruction_branch(parser, &ins->mips32);
break;
case MIPS32_PARSE_SL:
res = parse_instruction_sl(parser, &ins->mips32);
break;
case MIPS32_PARSE_SLI:
res = parse_instruction_sli(parser, &ins->mips32);
break;
case MIPS32_PARSE_S:
res = parse_instruction_s(parser, &ins->mips32);
break;
case MIPS32_PARSE_SV:
res = parse_instruction_sv(parser, &ins->mips32);
break;
}
if (res == M_SUCCESS && assert_eol(parser))
return M_ERROR;
return res;
}
static int parse_directive_align(struct parser *parser,
struct mips32_directive *directive)
{
struct token token;
if (assert_token(parser, TOK_NUMBER, &token))
return M_ERROR;
if (token.number < 0) {
ERROR_POS(token, "cannot align negative");
return M_ERROR;
}
if (token.number > MAX16) {
ERROR_POS(token, "cannot align more than 65kb");
return M_ERROR;
}
directive->type = MIPS32_DIRECTIVE_ALIGN;
directive->align = token.number;
return M_SUCCESS;
}
static int parse_directive_space(struct parser *parser,
struct mips32_directive *directive)
{
struct token token;
if (assert_token(parser, TOK_NUMBER, &token))
return M_ERROR;
if (token.number < 0) {
ERROR_POS(token, "cannot reserve negative");
return M_ERROR;
}
if (token.number > MAX16) {
ERROR_POS(token, "cannot reserve more than 65kb");
return M_ERROR;
}
directive->type = MIPS32_DIRECTIVE_SPACE;
directive->space = token.number;
return M_SUCCESS;
}
static int parse_directive_whb(struct parser *parser,
struct mips32_directive *directive,
enum mips32_directive_type type)
{
struct token token;
uint32_t size = 0;
uint32_t len = 0;
switch (type) {
case MIPS32_DIRECTIVE_WORD:
size = UINT32_MAX;
break;
case MIPS32_DIRECTIVE_HALF:
size = UINT16_MAX;
break;
case MIPS32_DIRECTIVE_BYTE:
size = UINT8_MAX;
break;
default:
}
directive->type = type;
while (1) {
if (assert_token(parser, TOK_NUMBER, &token))
return M_ERROR;
if (len >= MAX_ARG_LENGTH) {
ERROR_POS(token, "directives cannot be longer than "
"%d arguments", MAX_ARG_LENGTH);
return M_ERROR;
}
if (token.number > size) {
ERROR_POS(token, "number cannot execede max size of: "
"%d", size);
return M_ERROR;
}
switch (type) {
case MIPS32_DIRECTIVE_WORD:
directive->words[len++] = token.number;
break;
case MIPS32_DIRECTIVE_HALF:
directive->halfs[len++] = token.number;
break;
case MIPS32_DIRECTIVE_BYTE:
directive->bytes[len++] = token.number;
break;
default:
}
if (peek_token(parser, &token))
return M_ERROR;
if (token.type == TOK_COMMA) {
next_token(parser, NULL);
continue;
}
break;
}
return M_SUCCESS;
}
static int parse_section(struct parser *parser,
struct mips32_directive *directive,
char name[MAX_LEX_LENGTH])
{
directive->type = MIPS32_DIRECTIVE_SECTION;
strcpy(directive->name, name);
struct section *sec;
if (sectbl_get(&parser->sec_tbl, &sec, name) == M_SUCCESS) {
parser->sec_tbl.current = sec;
return M_SUCCESS;
}
if (sectbl_alloc(&parser->sec_tbl, &sec, name))
return M_ERROR;
parser->sec_tbl.current = sec;
return M_SUCCESS;
}
static int parse_directive(struct parser *parser,
union mips_directive *directive)
{
struct token token;
if (assert_token(parser, TOK_DIRECTIVE, &token))
return M_ERROR;
// .align n
if (strcmp(token.text, "align") == 0)
return parse_directive_align(parser, &directive->mips32);
else if (strcmp(token.text, "space") == 0)
return parse_directive_space(parser, &directive->mips32);
else if (strcmp(token.text, "word") == 0)
return parse_directive_whb(parser, &directive->mips32,
MIPS32_DIRECTIVE_WORD);
else if (strcmp(token.text, "half") == 0)
return parse_directive_whb(parser, &directive->mips32,
MIPS32_DIRECTIVE_HALF);
else if (strcmp(token.text, "byte") == 0)
return parse_directive_whb(parser, &directive->mips32,
MIPS32_DIRECTIVE_BYTE);
else
return parse_section(parser, &directive->mips32, token.text);
}
int mips32_parser_init(struct lexer *lexer, struct parser *parser)
{
if (parser_init(lexer, parser))
return M_ERROR;
parser->parse_instruction = parse_instruction;
parser->is_instruction = is_instruction;
parser->parse_directive = parse_directive;
return M_SUCCESS;
}
void mips32_parser_free(struct parser *parser)
{
parser_free(parser);
}

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masm/parse_mips32.h Normal file
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/* Copyright (c) 2024 Freya Murphy */
#ifndef __PARSE_MIPS32_H__
#define __PARSE_MIPS32_H__
#include "parse.h"
/* initzlize a mips32 parser*/
int mips32_parser_init(struct lexer *lexer, struct parser *parser);
/* free the mips32 parser */
void mips32_parser_free(struct parser *parser);
#endif /* __PARSE_MIPS32_H__ */

47
masm/reftbl.c Normal file
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#include <string.h>
#include <stdlib.h>
#include <mips.h>
#include <merror.h>
#include <mlimits.h>
#include "parse.h"
#define RELTBL_INIT_LEN 8
int reftbl_init(struct reference_table *ref_tbl)
{
ref_tbl->len = RELTBL_INIT_LEN;
ref_tbl->count = 0;
ref_tbl->references = malloc(sizeof(struct reference) *
RELTBL_INIT_LEN);
if (ref_tbl->references == NULL) {
ERROR("cannot alloc");
return M_ERROR;
}
return M_SUCCESS;
}
void reftbl_free(struct reference_table *ref_tbl)
{
free(ref_tbl->references);
}
int reftbl_push(struct reference_table *ref_tbl, struct reference reference)
{
if (ref_tbl->count >= ref_tbl->len) {
ref_tbl->len *= 2;
ref_tbl->references = realloc(ref_tbl->references,
sizeof(struct reference) * ref_tbl->len);
if (ref_tbl->references == NULL) {
ERROR("cannot realloc");
return M_ERROR;
}
}
ref_tbl->references[ref_tbl->count++] = reference;
return M_SUCCESS;
}

103
masm/sectbl.c Normal file
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#include <string.h>
#include <stdlib.h>
#include <mips.h>
#include <merror.h>
#include <mlimits.h>
#include "parse.h"
#define SECTBL_INIT_LEN 8
static const char inital_section[MAX_LEX_LENGTH] = "data";
int sectbl_init(struct section_table *sec_tbl)
{
sec_tbl->len = SECTBL_INIT_LEN;
sec_tbl->count = 0;
sec_tbl->total_ins = 0;
sec_tbl->sections = malloc(sizeof(struct section) * SECTBL_INIT_LEN);
if (sec_tbl->sections == NULL) {
ERROR("cannot alloc");
return M_ERROR;
}
if (sectbl_alloc(sec_tbl, &sec_tbl->current, inital_section))
return M_ERROR;
return M_SUCCESS;
}
void sectbl_free(struct section_table *sec_tbl)
{
for (uint32_t i = 0; i < sec_tbl->count; i++) {
free(sec_tbl->sections[i].ins);
}
free(sec_tbl->sections);
}
int sectbl_alloc(struct section_table *sec_tbl, struct section **sec,
const char name[MAX_LEX_LENGTH])
{
if (sec_tbl->count >= sec_tbl->len) {
sec_tbl->len *= 2;
sec_tbl->sections = realloc(sec_tbl->sections,
sizeof(struct section) * sec_tbl->len);
if (sec_tbl->sections == NULL) {
ERROR("cannot realloc");
return M_ERROR;
}
}
struct section *temp;
temp = &sec_tbl->sections[sec_tbl->count++];
strcpy(temp->name,name);
temp->count = 0;
temp->len = SECTBL_INIT_LEN;
temp->start = sec_tbl->total_ins;
temp->alignment = 1;
temp->ins = malloc(sizeof(union mips_instruction) * SECTBL_INIT_LEN);
if (temp->ins == NULL) {
ERROR("cannot alloc");
return M_ERROR;
}
*sec = temp;
return M_SUCCESS;
}
int sectbl_push(struct section_table *sec_tbl, struct section *section,
union mips_instruction ins)
{
if (section->count >= section->len) {
section->len *= 2;
section->ins = realloc(section->ins,
sizeof(union mips_instruction) * section->len);
if (section->ins == NULL) {
ERROR("cannot realloc");
return M_ERROR;
}
}
section->ins[section->count++] = ins;
sec_tbl->total_ins++;
return M_SUCCESS;
}
int sectbl_get(struct section_table *sec_tbl, struct section **sec,
const char name[MAX_LEX_LENGTH])
{
for (uint32_t i = 0; i < sec_tbl->count; i++) {
struct section *temp = &sec_tbl->sections[i];
if (strcmp(name, temp->name) == 0) {
if (sec != NULL)
*sec = temp;
return M_SUCCESS;
}
}
return M_ERROR;
}

49
masm/strtbl.c Normal file
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#include <merror.h>
#include <string.h>
#include <stdlib.h>
#include "asm.h"
int strtbl_get_str(struct str_table *str_tbl, const char *str, size_t *res)
{
for (size_t i = 0; i < str_tbl->size; i ++) {
if (strcmp(str_tbl->ptr + i, str) == 0) {
if (res != NULL)
*res = i;
return M_SUCCESS;
}
}
return M_ERROR;
}
int strtbl_write_str(struct str_table *str_tbl, const char *str, size_t *res)
{
if (strtbl_get_str(str_tbl, str, res) == M_SUCCESS)
return M_SUCCESS;
size_t len = strlen(str);
char *new = realloc(str_tbl->ptr, str_tbl->size + len + 1);
if (new == NULL)
return M_ERROR;
str_tbl->ptr = new;
memcpy(str_tbl->ptr + str_tbl->size, str, len + 1);
if (res != NULL)
*res = str_tbl->size;
str_tbl->size += len + 1;
return M_SUCCESS;
}
void strtbl_init(struct str_table *str_tbl)
{
str_tbl->size = 1;
str_tbl->ptr = malloc(1);
*str_tbl->ptr = '\0';
}
void strtbl_free(struct str_table *str_tbl)
{
free(str_tbl->ptr);
}

57
masm/symtbl.c Normal file
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#include <merror.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "parse.h"
#define SYMTBL_INIT_LEN 24
int symtbl_init(struct symbol_table *sym_tbl)
{
sym_tbl->len = SYMTBL_INIT_LEN;
sym_tbl->count = 0;
sym_tbl->symbols = malloc(sizeof(struct symbol) * SYMTBL_INIT_LEN);
if (sym_tbl->symbols == NULL) {
ERROR("cannot alloc");
return M_ERROR;
}
return M_SUCCESS;
}
void symtbl_free(struct symbol_table *sym_tbl)
{
free(sym_tbl->symbols);
}
int symtbl_push(struct symbol_table *sym_tbl, struct symbol sym)
{
if (sym_tbl->count >= sym_tbl->len) {
sym_tbl->len *= 2;
sym_tbl->symbols = realloc(sym_tbl->symbols,
sizeof(struct symbol) * sym_tbl->len);
if (sym_tbl->symbols == NULL) {
ERROR("cannot relloc");
return M_ERROR;
}
}
sym_tbl->symbols[sym_tbl->count++] = sym;
return M_SUCCESS;
}
int symtbl_find(struct symbol_table *sym_tbl, struct symbol **ptr,
const char name[MAX_LEX_LENGTH])
{
for (uint32_t i = 0; i < sym_tbl->count; i++) {
struct symbol *sym = &sym_tbl->symbols[i];
if (strcmp(sym->name, name) == 0) {
if (ptr != NULL)
*ptr = sym;
return M_SUCCESS;
}
}
return M_ERROR;
}

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masm/test.asm Normal file
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.text
.align 2
main:
add $zero,$t7,$t7
xori $a0, $v1, 69
addi $a0, $v1, 69
nor $s0, $s1, $s2
bltzall $s7, 0x50
lui $t7, 0x55
lw $t0, 18($t7)
sll $t0, $s0, 17
test:
mult $a0, $s6
mfhi $s0
mtlo $s7
j test