print 4004 in evm syscall

mipsevm/main.go

@@ -7,6 +7,7 @@ import (
 	"log"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -50,7 +51,7 @@ func main() {
 		steps = 1000000
 	}
 	if len(os.Args) > 1 {
-		if os.Args[1] == "../mipigeth/minigeth.bin" {
+		if strings.HasPrefix(os.Args[1], "../mipigeth/") {
 			debug, _ := strconv.Atoi(os.Getenv("DEBUG"))
 			RunMinigeth(os.Args[1], steps, debug)
 		} else if os.Args[1] == "unicorn" {

mipsevm/mipsevm.go

@@ -84,6 +84,15 @@ func (s *StateDB) GetState(fakeaddr common.Address, hash common.Hash) common.Has
 		if ram[nret] == 0xC {
 			syscall := ram[0xc0000008]
 			os.Stderr.WriteString(fmt.Sprintf("syscall %d at %x (step %d)\n", syscall, nret, pcCount))
+			if syscall == 4004 {
+				len := int(ram[0xc0000018])
+				buf := make([]byte, len+3)
+				for i := 0; i < len; i += 4 {
+					binary.BigEndian.PutUint32(buf[i:i+4], ram[ram[0xc0000014]+uint32(i)])
+				}
+				WriteBytes(int(ram[0xc0000010]), buf[0:len])
+				//fmt.Printf("%x %x %x\n", ram[0xc0000010], ram[0xc0000014], ram[0xc0000018])
+			}
 		}
 		if (pcCount % 10000) == 0 {
 			steps_per_sec := float64(pcCount) * 1e9 / float64(time.Now().Sub(ministart).Nanoseconds())

mipsevm/unicorn.go

@@ -22,8 +22,14 @@ func check(err error) {
 var steps int = 0
 var heap_start uint64 = 0
 
-func RegRead(u *uc.Unicorn, reg int) {
-
+func WriteBytes(fd int, bytes []byte) {
+	printer := color.New(color.FgWhite).SprintFunc()
+	if fd == 1 {
+		printer = color.New(color.FgGreen).SprintFunc()
+	} else if fd == 2 {
+		printer = color.New(color.FgRed).SprintFunc()
+	}
+	os.Stderr.WriteString(printer(string(bytes)))
 }
 
 // reimplement simple.py in go
@@ -51,14 +57,7 @@ func RunUnicorn(fn string, totalSteps int) {
 			buf, _ := mu.RegRead(uc.MIPS_REG_A1)
 			count, _ := mu.RegRead(uc.MIPS_REG_A2)
 			bytes, _ := mu.MemRead(buf, count)
-
-			printer := color.New(color.FgWhite).SprintFunc()
-			if fd == 1 {
-				printer = color.New(color.FgGreen).SprintFunc()
-			} else if fd == 2 {
-				printer = color.New(color.FgRed).SprintFunc()
-			}
-			os.Stderr.WriteString(printer(string(bytes)))
+			WriteBytes(int(fd), bytes)
 		} else if syscall_no == 4090 {
 			a0, _ := mu.RegRead(uc.MIPS_REG_A0)
 			sz, _ := mu.RegRead(uc.MIPS_REG_A1)