Add support for F_GETFD in order to support go1.22+

Author: mininny

rvgo/fast/vm.go

@@ -486,6 +486,26 @@ func (inst *InstrumentedState) riscvStep() (outErr error) {
 			var out U64
 			var errCode U64
 			switch cmd {
+			case 0x1: // F_GETFD: get file descriptor flags
+				switch fd {
+				case 0: // stdin
+					out = toU64(0) // no flag set
+				case 1: // stdout
+					out = toU64(0) // no flag set
+				case 2: // stderr
+					out = toU64(0) // no flag set
+				case 3: // hint-read
+					out = toU64(0) // no flag set
+				case 4: // hint-write
+					out = toU64(0) // no flag set
+				case 5: // pre-image read
+					out = toU64(0) // no flag set
+				case 6: // pre-image write
+					out = toU64(0) // no flag set
+				default:
+					out = u64Mask()
+					errCode = toU64(0x4d) //EBADF
+				}
 			case 0x3: // F_GETFL: get file descriptor flags
 				switch fd {
 				case 0: // stdin

rvgo/slow/vm.go

@@ -666,6 +666,26 @@ func Step(calldata []byte, po PreimageOracle) (stateHash common.Hash, outErr err
 			var out U64
 			var errCode U64
 			switch cmd.val() {
+			case 0x1: // F_GETFD: get file descriptor flags
+				switch fd.val() {
+				case 0: // stdin
+					out = toU64(0) // no flag set
+				case 1: // stdout
+					out = toU64(0) // no flag set
+				case 2: // stderr
+					out = toU64(0) // no flag set
+				case 3: // hint-read
+					out = toU64(0) // no flag set
+				case 4: // hint-write
+					out = toU64(0) // no flag set
+				case 5: // pre-image read
+					out = toU64(0) // no flag set
+				case 6: // pre-image write
+					out = toU64(0) // no flag set
+				default:
+					out = u64Mask()
+					errCode = toU64(0x4d) //EBADF
+				}
 			case 0x3: // F_GETFL: get file descriptor flags
 				switch fd.val() {
 				case 0: // stdin

rvgo/test/syscall_test.go

@@ -483,6 +483,17 @@ func FuzzStateSyscallFcntl(f *testing.F) {
 		}
 		testFcntl(t, fd, cmd, pc, step, 0xFFFF_FFFF_FFFF_FFFF, 0x16)
 	})
+
+	f.Fuzz(func(t *testing.T, fd uint64, cmd uint64, pc uint64, step uint64) {
+		// Test F_GETFD
+		for _, fd := range []uint64{0, 1, 2, 3, 4, 5, 6} {
+			testFcntl(t, fd, 1, pc, step, 0, 0)
+		}
+
+		// Test F_GETFD for unsupported fds
+		// Add 7 to fd to ensure fd > 6
+		testFcntl(t, fd+7, 1, pc, step, 0xFFFF_FFFF_FFFF_FFFF, 0x4d)
+	})
 }
 
 func FuzzStateSyscallOpenat(f *testing.F) {

rvsol/src/RISCV.sol

@@ -994,6 +994,34 @@ contract RISCV {
                     let out := 0
                     let errCode := 0
                     switch cmd
+                    case 0x1 { // F_GETFD: get file descriptor flags
+                        switch fd
+                        case 0 { // stdin
+                            out := toU64(0) // no flag set
+                        }
+                        case 1 { // stdout
+                            out := toU64(0) // no flag set
+                        }
+                            case 2 { // stderr
+                            out := toU64(0) // no flag set
+                        }
+                            case 3 { // hint-read
+                            out := toU64(0) // no flag set
+                        }
+                            case 4 { // hint-write
+                            out := toU64(0) // no flag set
+                        }
+                            case 5 {// pre-image read
+                            out := toU64(0) // no flag set
+                        }
+                            case 6 { // pre-image write
+                            out := toU64(0) // no flag set
+                        }
+                        default {
+                            out     := u64Mask()
+                            errCode := toU64(0x4d) //EBADF
+                        }
+                    }
                     case 0x3 {
                         // F_GETFL: get file descriptor flags
                         switch fd