577 lines
14 KiB
Go
577 lines
14 KiB
Go
// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package asm
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import (
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"testing"
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"sourcedock.dev/petrbalvin/gasm-devkit/ast"
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"sourcedock.dev/petrbalvin/gasm-devkit/parser"
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)
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// firstTextRISCV parses assembly source and returns the first TEXT function body.
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func firstTextRISCV(t *testing.T, src string) *ast.Text {
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t.Helper()
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f, errs := parser.Parse("f_riscv64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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for _, d := range f.Decls {
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if fn, ok := d.(*ast.Text); ok {
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return fn
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}
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}
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t.Fatal("no TEXT found")
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return nil
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}
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// assembleRISCVHelper assembles one TEXT function and returns its code bytes.
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func assembleRISCVHelper(t *testing.T, fn *ast.Text) []byte {
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t.Helper()
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code, _, err := assembleRISCV(fn)
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if err != nil {
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t.Fatalf("assemble: %v", err)
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}
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return code
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}
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func TestRISCV_add(t *testing.T) {
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// func add(a, b int64) int64
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·add(SB), NOSPLIT, $0-24
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MOV a+0(FP), X10
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MOV b+8(FP), X11
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ADD X11, X10, X10
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MOV X10, ret+16(FP)
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// should be 12 bytes with RVC: C.LDSP + C.LDSP + ADD + C.SDSP + C.JR
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_ = code
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if len(code) == 0 {
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t.Error("empty output")
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}
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}
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func TestRISCV_arithmetic(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·arith(SB), NOSPLIT, $0
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ADD X10, X11, X12
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SUB X12, X13, X14
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MUL X14, X15, X16
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DIV X16, X17, X18
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REM X18, X19, X20
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 5 R-type instructions + RET compressed = 5*4 + 2 = 22
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if len(code) != 22 {
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t.Errorf("expected 22 bytes, got %d", len(code))
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}
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}
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func TestRISCV_loadStore(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·mem(SB), NOSPLIT, $0
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LD (X10), X11
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SD X11, (X12)
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LW (X13), X14
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SW X14, (X15)
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 4 loads/stores (4B each) + C.JR RET (2B) = 18
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if len(code) != 18 {
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t.Errorf("expected 18 bytes, got %d", len(code))
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}
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}
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func TestRISCV_immediate(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·imm(SB), NOSPLIT, $0
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ADDI X10, $42, X11
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ANDI X11, $0xFF, X12
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ORI X12, $1, X13
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XORI X13, $0, X14
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 4 I-type + C.JR = 4*4 + 2 = 18
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if len(code) != 18 {
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t.Errorf("expected 18 bytes, got %d", len(code))
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}
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}
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func TestRISCV_branches(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·br(SB), NOSPLIT, $0
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ADDI X10, $1, X10
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loop:
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BEQ X10, X11, done
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ADDI X10, $1, X10
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JMP loop
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done:
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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_ = code
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if len(code) == 0 {
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t.Error("empty output")
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}
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}
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func TestRISCV_MOV_imm_small(t *testing.T) {
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// MOV $42, rd → ADDI (fits in 12 bits). Not RVC-compressed (treated as MOV, not ADDI).
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·small(SB), NOSPLIT, $0
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MOV $42, X10
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// ADDI (4B) + C.JR (2B) = 6
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if len(code) != 6 {
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t.Errorf("expected 6 bytes, got %d", len(code))
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}
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}
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func TestRISCV_MOV_imm_large(t *testing.T) {
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// MOV $0x12345, rd → LUI + ADDIW (8 bytes total)
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·large(SB), NOSPLIT, $0
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MOV $0x12345, X10
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// LUI (4B) + ADDIW (4B) + C.JR (2B) = 10
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if len(code) != 10 {
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t.Errorf("expected 10 bytes, got %d", len(code))
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}
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}
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func TestRISCV_MOV_reg(t *testing.T) {
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// MOV rs, rd → ADDI $0, rs, rd, compresses to C.MV
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·reg(SB), NOSPLIT, $0
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MOV X10, X11
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.MV (2B) + C.JR (2B) = 4
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if len(code) != 4 {
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t.Errorf("expected 4 bytes, got %d (% x)", len(code), code)
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}
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}
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func TestRISCV_MOV_frame(t *testing.T) {
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// MOV name+off(FP), rd → load with frame mapping
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·frame(SB), NOSPLIT, $0-8
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MOV a+0(FP), X10
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MOV X10, ret+0(FP)
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.LDSP (2B) + C.SDSP (2B) + C.JR (2B) = 6
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if len(code) != 6 {
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t.Errorf("expected 6 bytes, got %d", len(code))
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}
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}
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func TestRISCV_RVC_loadStore(t *testing.T) {
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// Verify that loads/stores from SP (X2) are compressed.
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·rvcstore(SB), NOSPLIT, $0
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LD 0(X2), X10
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SD X10, 8(X2)
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.LDSP (2B) + C.SDSP (2B) + C.JR (2B) = 6
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if len(code) != 6 {
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t.Errorf("expected 6 bytes, got %d (% x)", len(code), code)
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}
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}
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func TestRISCV_atomics(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·amo(SB), NOSPLIT, $0
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AMOADDD X10, (X11), X12
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LRD (X13), X14
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SCD X15, (X16), X17
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 3 AMO instructions (4B each) + C.JR (2B) = 14
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if len(code) != 14 {
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t.Errorf("expected 14 bytes, got %d", len(code))
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}
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}
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func TestRISCV_fpArith(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·fpadd(SB), NOSPLIT, $0
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FADDD F10, F11, F12
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FSUBD F12, F13, F14
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FMULD F14, F15, F16
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FDIVD F16, F17, F18
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FSQRTD F18, F19
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 5 FP instructions (4B each) + C.JR (2B) = 22
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if len(code) != 22 {
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t.Errorf("expected 22 bytes, got %d (%d)", len(code), len(code))
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}
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}
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func TestRISCV_csr(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·csrtest(SB), NOSPLIT, $0
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CSRRS $0x300, X0, X10
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CSRRW $0x305, X10, X11
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CSRRSI $0x304, $5, X12
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 3 CSR instructions (4B each) + C.JR (2B) = 14
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if len(code) != 14 {
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t.Errorf("expected 14 bytes, got %d", len(code))
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}
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}
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func TestRISCV_fma(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·fmatest(SB), NOSPLIT, $0
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FMADDD F10, F11, F12, F13
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FMSUBD F13, F14, F15, F16
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FNMSUBD F16, F17, F18, F19
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FNMADDD F19, F10, F11, F12
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 4 FMA instructions (4B each) + C.JR (2B) = 18
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if len(code) != 18 {
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t.Errorf("expected 18 bytes, got %d", len(code))
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}
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}
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func TestRISCV_conversions(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·cvt(SB), NOSPLIT, $0
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FCVTDL X10, F10
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FCVTLD F10, X11
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FMVXD F10, X12
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FMVDX X12, F11
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 4 conversion instructions (4B each) + C.JR (2B) = 18
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if len(code) != 18 {
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t.Errorf("expected 18 bytes, got %d", len(code))
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}
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}
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func TestRISCV_fpCmp(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·cmp(SB), NOSPLIT, $0
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FEQD F10, F11, X10
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FLTD F12, F13, X11
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FLED F14, F15, X12
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// 3 FP compare (4B each) + C.JR (2B) = 14
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if len(code) != 14 {
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t.Errorf("expected 14 bytes, got %d", len(code))
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}
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}
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func TestRISCV_forwardBranch(t *testing.T) {
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// Forward label reference — must not fail.
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·fwd(SB), NOSPLIT, $0
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ADDI X10, $1, X10
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BEQ X10, X11, done
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ADDI X10, $1, X10
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done:
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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_ = code
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if len(code) == 0 {
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t.Error("empty output")
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}
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}
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func TestRISCV_RVC_ADDI(t *testing.T) {
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// ADDI where rd=rs1 and small imm → C.ADDI
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·caddi(SB), NOSPLIT, $0
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ADDI X10, $5, X10
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.ADDI (2B) + C.JR (2B) = 4
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if len(code) != 4 {
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t.Errorf("expected 4 bytes, got %d", len(code))
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}
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}
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func TestRISCV_RVC_LI(t *testing.T) {
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// ADDI X0, $imm, rd → C.LI
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·cli(SB), NOSPLIT, $0
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ADDI X0, $7, X10
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.LI (2B) + C.JR (2B) = 4
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if len(code) != 4 {
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t.Errorf("expected 4 bytes, got %d", len(code))
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}
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}
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func TestRISCV_RVC_LUI(t *testing.T) {
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// LUI rd, small nonzero imm → C.LUI
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·clui(SB), NOSPLIT, $0
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LUI X10, $1
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.LUI (2B) + C.JR (2B) = 4
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if len(code) != 4 {
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t.Errorf("expected 4 bytes, got %d", len(code))
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}
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}
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func TestRISCV_AssembleFile(t *testing.T) {
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src := `#include "textflag.h"
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TEXT ·add(SB), NOSPLIT, $0-24
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MOV a+0(FP), X10
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RET
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TEXT ·sub(SB), NOSPLIT, $0
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SUB X10, X11, X12
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RET
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`
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f, errs := parser.Parse("t_riscv64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := AssembleFileRISCV(f)
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if err != nil {
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t.Fatalf("AssembleFileRISCV: %v", err)
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}
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if len(img.Funcs) != 2 {
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t.Fatalf("expected 2 functions, got %d", len(img.Funcs))
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}
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// func add: C.LDSP(2) + C.JR(2) = 4
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if img.Funcs[0].Size != 4 {
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t.Errorf("add: expected 4 bytes, got %d", img.Funcs[0].Size)
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}
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// func sub: SUB(4) + C.JR(2) = 6
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if img.Funcs[1].Size != 6 {
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t.Errorf("sub: expected 6 bytes, got %d", img.Funcs[1].Size)
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}
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}
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func TestRISCV_encodings(t *testing.T) {
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// Smoke test that all known RISC-V mnemonics encode successfully.
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tests := []struct {
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name, src string
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wantBytes int
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}{
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{"ADD", "ADD X10, X11, X12\nRET\n", 6},
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{"SUBW", "SUBW X10, X11, X12\nRET\n", 6},
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{"MUL", "MUL X10, X11, X12\nRET\n", 6},
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{"DIVW", "DIVW X10, X11, X12\nRET\n", 6},
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{"REMUW", "REMUW X10, X11, X12\nRET\n", 6},
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{"ADDIW", "ADDIW X10, $5, X11\nRET\n", 6},
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{"SLLI", "SLLI X10, $3, X11\nRET\n", 6}, // ADDI+SLLI? No, SLLI uses I-type
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{"SRLI", "SRLI X10, $2, X11\nRET\n", 6},
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{"SRAI", "SRAI X10, $1, X11\nRET\n", 6},
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{"LB", "LB (X10), X11\nRET\n", 6},
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{"LBU", "LBU (X10), X11\nRET\n", 6},
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{"LH", "LH (X10), X11\nRET\n", 6},
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{"LHU", "LHU (X10), X11\nRET\n", 6},
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{"LWU", "LWU (X10), X11\nRET\n", 6},
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{"SB", "SB X10, (X11)\nRET\n", 6},
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{"SH", "SH X10, (X11)\nRET\n", 6},
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{"SW", "SW X10, (X11)\nRET\n", 6},
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{"LUI", "LUI X10, $0x12345\nRET\n", 6},
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{"AUIPC", "AUIPC X10, $0\nRET\n", 6},
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{"FLW", "FLW (X10), F10\nRET\n", 6},
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{"FSW", "FSW F10, (X11)\nRET\n", 6},
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{"FADDS", "FADDS F10, F11, F12\nRET\n", 6},
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{"FMINS", "FMINS F10, F11, F12\nRET\n", 6},
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{"FMAXD", "FMAXD F10, F11, F12\nRET\n", 6},
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{"FCVTSD", "FCVTSD F10, F11\nRET\n", 6},
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{"FCVTDS", "FCVTDS F10, F11\nRET\n", 6},
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{"FMVXW", "FMVXW F10, X10\nRET\n", 6},
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{"FMADD_S", "FMADDS F10, F11, F12, F13\nRET\n", 6},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·`+tt.name+`(SB), NOSPLIT, $0
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`+tt.src)
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code := assembleRISCVHelper(t, fn)
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if len(code) != tt.wantBytes {
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t.Errorf("expected %d bytes, got %d", tt.wantBytes, len(code))
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}
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})
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}
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}
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func TestRISCV_RVC_branch(t *testing.T) {
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// BEQ rs, X0, target → C.BEQZ when rs is in prime regs and offset fits.
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·cbeqz(SB), NOSPLIT, $0
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ADDI X10, $1, X10
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BEQ X10, X0, done
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ADDI X10, $1, X10
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done:
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.ADDI(2) + C.BEQZ(2) + C.ADDI(2) + C.JR(2) = 8 (all compress)
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if len(code) != 8 {
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t.Errorf("expected 8 bytes with C.BEQZ, got %d", len(code))
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}
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}
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func TestRISCV_RVC_CJ(t *testing.T) {
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// JMP target → C.J when offset fits.
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fn := firstTextRISCV(t, `#include "textflag.h"
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TEXT ·cj(SB), NOSPLIT, $0
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JMP done
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done:
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RET
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`)
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code := assembleRISCVHelper(t, fn)
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// C.J(2) + C.JR(2) = 4
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.J, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CADD(t *testing.T) {
|
|
// ADD where rd==rs1 and both in prime regs → C.ADD.
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cadd(SB), NOSPLIT, $0
|
|
ADD X10, X11, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
// C.ADD(2) + C.JR(2) = 4
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.ADD, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CADD_commute(t *testing.T) {
|
|
// ADD where rd==rs2 (commutative swap) → C.ADD.
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cadd2(SB), NOSPLIT, $0
|
|
ADD X11, X10, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
// C.ADD(2) + C.JR(2) = 4
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.ADD (commuted), got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CSUB(t *testing.T) {
|
|
// SUB where rd==rs1 and both in prime regs → C.SUB.
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·csub(SB), NOSPLIT, $0
|
|
SUB X11, X10, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
// SUB X11,X10,X10 → rd=X10, rs1=X11 ≠ rd → no C.SUB.
|
|
// Plan9: INSTR src1, src2, dst. For C.SUB: rd must equal rs1.
|
|
// So: SUB X10, X11, X10 → rd=10, rs1=10, rs2=11 ✓
|
|
if len(code) == 4 {
|
|
return // compressed
|
|
}
|
|
// Try with correct operand order.
|
|
fn2 := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·csub2(SB), NOSPLIT, $0
|
|
SUB X10, X11, X10
|
|
RET
|
|
`)
|
|
code2 := assembleRISCVHelper(t, fn2)
|
|
if len(code2) != 4 {
|
|
t.Errorf("expected 4 bytes with C.SUB, got %d (% x)", len(code2), code2)
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CXOR(t *testing.T) {
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cxor(SB), NOSPLIT, $0
|
|
XOR X10, X11, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.XOR, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_COR(t *testing.T) {
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cor(SB), NOSPLIT, $0
|
|
OR X10, X11, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.OR, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CAND(t *testing.T) {
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cand(SB), NOSPLIT, $0
|
|
AND X10, X11, X10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.AND, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CFLDSP(t *testing.T) {
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cfldsp(SB), NOSPLIT, $0-8
|
|
FLD a+0(FP), F10
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
// C.FLDSP(2) + C.JR(2) = 4
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.FLDSP, got %d", len(code))
|
|
}
|
|
}
|
|
|
|
func TestRISCV_RVC_CFSDSP(t *testing.T) {
|
|
fn := firstTextRISCV(t, `#include "textflag.h"
|
|
TEXT ·cfsdsp(SB), NOSPLIT, $0-8
|
|
FSD F10, ret+0(FP)
|
|
RET
|
|
`)
|
|
code := assembleRISCVHelper(t, fn)
|
|
// C.FSDSP(2) + C.JR(2) = 4
|
|
if len(code) != 4 {
|
|
t.Errorf("expected 4 bytes with C.FSDSP, got %d", len(code))
|
|
}
|
|
}
|