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tinycc/riscv64-asm.c
noneofyourbusiness d1c107738b
riscv64-asm.c: add jal/jalr 
this implements the base instructions, not the pseudoinstructions

examples
 jal ra, 0
 jalr x0, ra, 0
2023-08-11 10:08:41 +02:00

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/*************************************************************/
/*
* RISCV64 assembler for TCC
*
*/
#ifdef TARGET_DEFS_ONLY
#define CONFIG_TCC_ASM
#define NB_ASM_REGS 32
ST_FUNC void g(int c);
ST_FUNC void gen_le16(int c);
ST_FUNC void gen_le32(int c);
/*************************************************************/
#else
/*************************************************************/
#define USING_GLOBALS
#include "tcc.h"
/* XXX: make it faster ? */
ST_FUNC void g(int c)
{
int ind1;
if (nocode_wanted)
return;
ind1 = ind + 1;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind] = c;
ind = ind1;
}
ST_FUNC void gen_le16 (int i)
{
g(i);
g(i>>8);
}
ST_FUNC void gen_le32 (int i)
{
int ind1;
if (nocode_wanted)
return;
ind1 = ind + 4;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
cur_text_section->data[ind++] = i & 0xFF;
cur_text_section->data[ind++] = (i >> 8) & 0xFF;
cur_text_section->data[ind++] = (i >> 16) & 0xFF;
cur_text_section->data[ind++] = (i >> 24) & 0xFF;
}
ST_FUNC void gen_expr32(ExprValue *pe)
{
gen_le32(pe->v);
}
static void asm_emit_opcode(uint32_t opcode) {
gen_le32(opcode);
}
static void asm_nullary_opcode(TCCState *s1, int token)
{
switch (token) {
// Sync instructions
case TOK_ASM_fence: // I
asm_emit_opcode((0x3 << 2) | 3 | (0 << 12));
return;
case TOK_ASM_fence_i: // I
asm_emit_opcode((0x3 << 2) | 3| (1 << 12));
return;
// System calls
case TOK_ASM_ecall: // I (pseudo)
asm_emit_opcode((0x1C << 2) | 3 | (0 << 12));
return;
case TOK_ASM_ebreak: // I (pseudo)
asm_emit_opcode((0x1C << 2) | 3 | (0 << 12) | (1 << 20));
return;
// Other
case TOK_ASM_wfi:
asm_emit_opcode((0x1C << 2) | 3 | (0x105 << 20));
return;
default:
expect("nullary instruction");
}
}
enum {
OPT_REG,
OPT_IM12S,
OPT_IM32,
};
#define OP_REG (1 << OPT_REG)
#define OP_IM32 (1 << OPT_IM32)
#define OP_IM12S (1 << OPT_IM12S)
typedef struct Operand {
uint32_t type;
union {
uint8_t reg;
uint16_t regset;
ExprValue e;
};
} Operand;
static void asm_emit_i(int token, uint32_t opcode, const Operand* rd, const Operand* rs1, const Operand* rs2);
/* Parse a text containing operand and store the result in OP */
static void parse_operand(TCCState *s1, Operand *op)
{
ExprValue e;
int8_t reg;
op->type = 0;
if ((reg = asm_parse_regvar(tok)) != -1) {
next(); // skip register name
op->type = OP_REG;
op->reg = (uint8_t) reg;
return;
} else if (tok == '$') {
/* constant value */
next(); // skip '#' or '$'
}
asm_expr(s1, &e);
op->type = OP_IM32;
op->e = e;
if (!op->e.sym) {
if ((int) op->e.v >= -2048 && (int) op->e.v < 2048)
op->type = OP_IM12S;
} else
expect("operand");
}
#define ENCODE_RS1(register_index) ((register_index) << 15)
#define ENCODE_RS2(register_index) ((register_index) << 20)
#define ENCODE_RD(register_index) ((register_index) << 7)
// Note: Those all map to CSR--so they are pseudo-instructions.
static void asm_unary_opcode(TCCState *s1, int token)
{
uint32_t opcode = (0x1C << 2) | 3 | (2 << 12);
Operand op;
parse_operand(s1, &op);
if (op.type != OP_REG) {
expect("register");
return;
}
opcode |= ENCODE_RD(op.reg);
switch (token) {
case TOK_ASM_rdcycle:
asm_emit_opcode(opcode | (0xC00 << 20));
return;
case TOK_ASM_rdcycleh:
asm_emit_opcode(opcode | (0xC80 << 20));
return;
case TOK_ASM_rdtime:
asm_emit_opcode(opcode | (0xC01 << 20) | ENCODE_RD(op.reg));
return;
case TOK_ASM_rdtimeh:
asm_emit_opcode(opcode | (0xC81 << 20) | ENCODE_RD(op.reg));
return;
case TOK_ASM_rdinstret:
asm_emit_opcode(opcode | (0xC02 << 20) | ENCODE_RD(op.reg));
return;
case TOK_ASM_rdinstreth:
asm_emit_opcode(opcode | (0xC82 << 20) | ENCODE_RD(op.reg));
return;
default:
expect("unary instruction");
}
}
static void asm_emit_u(int token, uint32_t opcode, const Operand* rd, const Operand* rs2)
{
if (rd->type != OP_REG) {
tcc_error("'%s': Expected destination operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs2->type != OP_IM12S && rs2->type != OP_IM32) {
tcc_error("'%s': Expected second source operand that is an immediate value", get_tok_str(token, NULL));
return;
} else if (rs2->e.v >= 0x100000) {
tcc_error("'%s': Expected second source operand that is an immediate value between 0 and 0xfffff", get_tok_str(token, NULL));
return;
}
/* U-type instruction:
31...12 imm[31:12]
11...7 rd
6...0 opcode */
gen_le32(opcode | ENCODE_RD(rd->reg) | (rs2->e.v << 12));
}
static void asm_binary_opcode(TCCState* s1, int token)
{
Operand ops[2];
parse_operand(s1, &ops[0]);
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[1]);
switch (token) {
case TOK_ASM_lui:
asm_emit_u(token, (0xD << 2) | 3, &ops[0], &ops[1]);
return;
case TOK_ASM_auipc:
asm_emit_u(token, (0x05 << 2) | 3, &ops[0], &ops[1]);
return;
case TOK_ASM_jal:
asm_emit_u(token, 0x6f, ops, ops + 1);
return;
default:
expect("binary instruction");
}
}
/* caller: Add funct3, funct7 into opcode */
static void asm_emit_r(int token, uint32_t opcode, const Operand* rd, const Operand* rs1, const Operand* rs2)
{
if (rd->type != OP_REG) {
tcc_error("'%s': Expected destination operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs1->type != OP_REG) {
tcc_error("'%s': Expected first source operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs2->type != OP_REG) {
tcc_error("'%s': Expected second source operand that is a register or immediate", get_tok_str(token, NULL));
return;
}
/* R-type instruction:
31...25 funct7
24...20 rs2
19...15 rs1
14...12 funct3
11...7 rd
6...0 opcode */
gen_le32(opcode | ENCODE_RD(rd->reg) | ENCODE_RS1(rs1->reg) | ENCODE_RS2(rs2->reg));
}
/* caller: Add funct3 into opcode */
static void asm_emit_i(int token, uint32_t opcode, const Operand* rd, const Operand* rs1, const Operand* rs2)
{
if (rd->type != OP_REG) {
tcc_error("'%s': Expected destination operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs1->type != OP_REG) {
tcc_error("'%s': Expected first source operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs2->type != OP_IM12S) {
tcc_error("'%s': Expected second source operand that is an immediate value between 0 and 4095", get_tok_str(token, NULL));
return;
}
/* I-type instruction:
31...20 imm[11:0]
19...15 rs1
14...12 funct3
11...7 rd
6...0 opcode */
gen_le32(opcode | ENCODE_RD(rd->reg) | ENCODE_RS1(rs1->reg) | (rs2->e.v << 20));
}
static void asm_shift_opcode(TCCState *s1, int token)
{
Operand ops[3];
parse_operand(s1, &ops[0]);
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[1]);
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[2]);
switch (token) {
case TOK_ASM_sll:
asm_emit_r(token, (0xC << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_slli:
asm_emit_i(token, (4 << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_srl:
asm_emit_r(token, (0xC << 2) | 3 | (4 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_srli:
asm_emit_i(token, (0x4 << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sra:
asm_emit_r(token, (0xC << 2) | 3 | (5 << 12) | (32 << 25), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_srai:
asm_emit_i(token, (0x4 << 2) | 3 | (5 << 12) | (16 << 26), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sllw:
asm_emit_r(token, (0xE << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_slliw:
asm_emit_i(token, (6 << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_srlw:
asm_emit_r(token, (0xE << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_srliw:
asm_emit_i(token, (0x6 << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sraw:
asm_emit_r(token, (0xE << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sraiw:
asm_emit_i(token, (0x6 << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
default:
expect("shift instruction");
}
}
static void asm_data_processing_opcode(TCCState* s1, int token)
{
Operand ops[3];
parse_operand(s1, &ops[0]);
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[1]);
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[2]);
switch (token) {
// Arithmetic (RD,RS1,(RS2|IMM)); R-format, I-format or U-format
case TOK_ASM_add:
asm_emit_r(token, (0xC << 2) | 3, &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_addi:
asm_emit_i(token, (4 << 2) | 3, &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sub:
asm_emit_r(token, (0xC << 2) | 3 | (32 << 25), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_addw:
asm_emit_r(token, (0xE << 2) | 3 | (0 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_addiw: // 64 bit
asm_emit_i(token, (0x6 << 2) | 3 | (0 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_subw:
asm_emit_r(token, (0xE << 2) | 3 | (0 << 12) | (32 << 25), &ops[0], &ops[1], &ops[2]);
return;
// Logical (RD,RS1,(RS2|IMM)); R-format or I-format
case TOK_ASM_xor:
asm_emit_r(token, (0xC << 2) | 3 | (4 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_xori:
asm_emit_i(token, (0x4 << 2) | 3 | (4 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_or:
asm_emit_r(token, (0xC << 2) | 3 | (6 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_ori:
asm_emit_i(token, (0x4 << 2) | 3 | (6 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_and:
asm_emit_r(token, (0xC << 2) | 3 | (7 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_andi:
asm_emit_i(token, (0x4 << 2) | 3 | (7 << 12), &ops[0], &ops[1], &ops[2]);
return;
// Compare (RD,RS1,(RS2|IMM)); R-format or I-format
case TOK_ASM_slt:
asm_emit_r(token, (0xC << 2) | 3 | (2 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_slti:
asm_emit_i(token, (0x4 << 2) | 3 | (2 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sltu:
asm_emit_r(token, (0xC << 2) | 3 | (3 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sltiu:
asm_emit_i(token, (0x4 << 2) | 3 | (3 << 12), &ops[0], &ops[1], &ops[2]);
return;
/* indirect jump (RD, RS1, IMM); I-format */
case TOK_ASM_jalr:
asm_emit_i(token, 0x67 | (0 << 12), ops, ops + 1, ops + 2);
return;
default:
expect("known data processing instruction");
}
}
/* caller: Add funct3 to opcode */
static void asm_emit_s(int token, uint32_t opcode, const Operand* rs1, const Operand* rs2, const Operand* imm)
{
if (rs1->type != OP_REG) {
tcc_error("'%s': Expected first source operand that is a register", get_tok_str(token, NULL));
return;
}
if (rs2->type != OP_REG) {
tcc_error("'%s': Expected second source operand that is a register", get_tok_str(token, NULL));
return;
}
if (imm->type != OP_IM12S) {
tcc_error("'%s': Expected third operand that is an immediate value between 0 and 0xfff", get_tok_str(token, NULL));
return;
}
{
uint16_t v = imm->e.v;
/* S-type instruction:
31...25 imm[11:5]
24...20 rs2
19...15 rs1
14...12 funct3
11...7 imm[4:0]
6...0 opcode
opcode always fixed pos. */
gen_le32(opcode | ENCODE_RS1(rs1->reg) | ENCODE_RS2(rs2->reg) | ((v & 0x1F) << 7) | ((v >> 5) << 25));
}
}
static void asm_data_transfer_opcode(TCCState* s1, int token)
{
Operand ops[3];
parse_operand(s1, &ops[0]);
if (ops[0].type != OP_REG) {
expect("register");
return;
}
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[1]);
if (ops[1].type != OP_REG) {
expect("register");
return;
}
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[2]);
switch (token) {
// Loads (RD,RS1,I); I-format
case TOK_ASM_lb:
asm_emit_i(token, (0x0 << 2) | 3, &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_lh:
asm_emit_i(token, (0x0 << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_lw:
asm_emit_i(token, (0x0 << 2) | 3 | (2 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_lbu:
asm_emit_i(token, (0x0 << 2) | 3 | (4 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_lhu:
asm_emit_i(token, (0x0 << 2) | 3 | (5 << 12), &ops[0], &ops[1], &ops[2]);
return;
// 64 bit
case TOK_ASM_ld:
asm_emit_i(token, (0x0 << 2) | 3 | (3 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_lwu:
asm_emit_i(token, (0x0 << 2) | 3 | (6 << 12), &ops[0], &ops[1], &ops[2]);
return;
// Stores (RS1,RS2,I); S-format
case TOK_ASM_sb:
asm_emit_s(token, (0x8 << 2) | 3 | (0 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sh:
asm_emit_s(token, (0x8 << 2) | 3 | (1 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sw:
asm_emit_s(token, (0x8 << 2) | 3 | (2 << 12), &ops[0], &ops[1], &ops[2]);
return;
case TOK_ASM_sd:
asm_emit_s(token, (0x8 << 2) | 3 | (3 << 12), &ops[0], &ops[1], &ops[2]);
return;
default:
expect("known data transfer instruction");
}
}
static void asm_branch_opcode(TCCState* s1, int token)
{
// Branch (RS1,RS2,IMM); SB-format
uint32_t opcode = (0x18 << 2) | 3;
uint32_t offset = 0;
Operand ops[3];
parse_operand(s1, &ops[0]);
if (ops[0].type != OP_REG) {
expect("register");
return;
}
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[1]);
if (ops[1].type != OP_REG) {
expect("register");
return;
}
if (tok == ',')
next();
else
expect("','");
parse_operand(s1, &ops[2]);
if (ops[2].type != OP_IM12S) {
tcc_error("'%s': Expected third operand that is an immediate value between 0 and 0xfff", get_tok_str(token, NULL));
return;
}
offset = ops[2].e.v;
if (offset & 1) {
tcc_error("'%s': Expected third operand that is an even immediate value", get_tok_str(token, NULL));
return;
}
switch (token) {
case TOK_ASM_beq:
opcode |= 0 << 12;
break;
case TOK_ASM_bne:
opcode |= 1 << 12;
break;
case TOK_ASM_blt:
opcode |= 4 << 12;
break;
case TOK_ASM_bge:
opcode |= 5 << 12;
break;
case TOK_ASM_bltu:
opcode |= 6 << 12;
break;
case TOK_ASM_bgeu:
opcode |= 7 << 12;
break;
default:
expect("known branch instruction");
}
asm_emit_opcode(opcode | ENCODE_RS1(ops[0].reg) | ENCODE_RS2(ops[1].reg) | (((offset >> 1) & 0xF) << 8) | (((offset >> 5) & 0x1f) << 25) | (((offset >> 11) & 1) << 7) | (((offset >> 12) & 1) << 31));
}
ST_FUNC void asm_opcode(TCCState *s1, int token)
{
switch (token) {
case TOK_ASM_fence:
case TOK_ASM_fence_i:
case TOK_ASM_ecall:
case TOK_ASM_ebreak:
case TOK_ASM_mrts:
case TOK_ASM_mrth:
case TOK_ASM_hrts:
case TOK_ASM_wfi:
asm_nullary_opcode(s1, token);
return;
case TOK_ASM_rdcycle:
case TOK_ASM_rdcycleh:
case TOK_ASM_rdtime:
case TOK_ASM_rdtimeh:
case TOK_ASM_rdinstret:
case TOK_ASM_rdinstreth:
asm_unary_opcode(s1, token);
return;
case TOK_ASM_lui:
case TOK_ASM_auipc:
case TOK_ASM_jal:
asm_binary_opcode(s1, token);
return;
case TOK_ASM_sll:
case TOK_ASM_slli:
case TOK_ASM_srl:
case TOK_ASM_srli:
case TOK_ASM_sra:
case TOK_ASM_srai:
case TOK_ASM_sllw:
case TOK_ASM_slld:
case TOK_ASM_slliw:
case TOK_ASM_sllid:
case TOK_ASM_srlw:
case TOK_ASM_srld:
case TOK_ASM_srliw:
case TOK_ASM_srlid:
case TOK_ASM_sraw:
case TOK_ASM_srad:
case TOK_ASM_sraiw:
case TOK_ASM_sraid:
asm_shift_opcode(s1, token);
return;
case TOK_ASM_add:
case TOK_ASM_addi:
case TOK_ASM_sub:
case TOK_ASM_addw:
case TOK_ASM_addiw:
case TOK_ASM_subw:
case TOK_ASM_xor:
case TOK_ASM_xori:
case TOK_ASM_or:
case TOK_ASM_ori:
case TOK_ASM_and:
case TOK_ASM_andi:
case TOK_ASM_slt:
case TOK_ASM_slti:
case TOK_ASM_sltu:
case TOK_ASM_sltiu:
case TOK_ASM_jalr:
asm_data_processing_opcode(s1, token);
return;
case TOK_ASM_lb:
case TOK_ASM_lh:
case TOK_ASM_lw:
case TOK_ASM_lbu:
case TOK_ASM_lhu:
case TOK_ASM_ld:
case TOK_ASM_lwu:
case TOK_ASM_sb:
case TOK_ASM_sh:
case TOK_ASM_sw:
case TOK_ASM_sd:
asm_data_transfer_opcode(s1, token);
return;
case TOK_ASM_beq:
case TOK_ASM_bne:
case TOK_ASM_blt:
case TOK_ASM_bge:
case TOK_ASM_bltu:
case TOK_ASM_bgeu:
asm_branch_opcode(s1, token);
return;
default:
expect("known instruction");
}
}
ST_FUNC void subst_asm_operand(CString *add_str, SValue *sv, int modifier)
{
tcc_error("RISCV64 asm not implemented.");
}
/* generate prolog and epilog code for asm statement */
ST_FUNC void asm_gen_code(ASMOperand *operands, int nb_operands,
int nb_outputs, int is_output,
uint8_t *clobber_regs,
int out_reg)
{
}
ST_FUNC void asm_compute_constraints(ASMOperand *operands,
int nb_operands, int nb_outputs,
const uint8_t *clobber_regs,
int *pout_reg)
{
}
ST_FUNC void asm_clobber(uint8_t *clobber_regs, const char *str)
{
int reg;
TokenSym *ts;
if (!strcmp(str, "memory") ||
!strcmp(str, "cc") ||
!strcmp(str, "flags"))
return;
ts = tok_alloc(str, strlen(str));
reg = asm_parse_regvar(ts->tok);
if (reg == -1) {
tcc_error("invalid clobber register '%s'", str);
}
clobber_regs[reg] = 1;
}
ST_FUNC int asm_parse_regvar (int t)
{
if (t >= TOK_ASM_x0 && t <= TOK_ASM_pc) { /* register name */
if (t >= TOK_ASM_zero && t <= TOK_ASM_t6)
return t - TOK_ASM_zero;
switch (t) {
case TOK_ASM_s0:
return 8;
case TOK_ASM_pc:
tcc_error("PC register not implemented.");
default:
return t - TOK_ASM_x0;
}
} else
return -1;
}
/*************************************************************/
#endif /* ndef TARGET_DEFS_ONLY */
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