feat(cmd): add gasm dis and share the decoder with the debugger

debug/disasm_linux_riscv64.go

@@ -8,7 +8,8 @@ package debug
 import (
 	"fmt"
 
-	"golang.org/x/arch/riscv64/riscv64asm"
+	"sourcedock.dev/petrbalvin/gasm-devkit/arch"
+	"sourcedock.dev/petrbalvin/gasm-devkit/disasm"
 )
 
 // Disassemble decodes the instruction at the given address in the debuggee's
@@ -18,12 +19,11 @@ func (s *Session) Disassemble(addr uint64) (string, int, error) {
 	if err != nil {
 		return "", 0, err
 	}
-	inst, err := riscv64asm.Decode(mem)
+	ins, err := disasm.Decode(arch.RISCV, mem, addr)
 	if err != nil {
-		return "???", 4, nil
+		return "", 0, err
 	}
-	text := riscv64asm.GoSyntax(inst, addr, nil, nil)
-	return text, inst.Len, nil
+	return ins.Text, ins.Len, nil
 }
 
 // DisassembleN decodes up to n instructions starting at addr.