jump

.vscode/launch.json

@@ -7,7 +7,7 @@
             "request": "launch",
             "program": "${workspaceFolder}/bin/tcpu",
             "windows": { "program": "${workspaceFolder}/bin/tcpu.exe" },
-            "args": [ "-c", "../examples/s.tasm", "o.bin", "--debug" ],
+            "args": [ "-c", "../examples/conditional_jump.tasm", "o.bin", "--debug", "-i", "o.bin" ],
             "cwd": "${workspaceFolder}/bin",
             "preLaunchTask": "build_exec_dbg",
             "stopAtEntry": false,

TODO.md

@@ -1,2 +1,9 @@
 # TODO List
+- add negative number arguments support
+- change section binary format:
+    1. code
+    2. exit instruction with code ERR_U_FORGOT_TO_CALL_EXIT
+    3. data
+- add padding to compilation
 - arguments validation for each instruction
+- VM debug mode

examples/conditional_jump.tasm

@@ -0,0 +1,32 @@
+/*
+Example of behavior change depending on some condition
+*/
+
+.main:
+movc ax 1
+movc bx 2
+gt cx ax bx
+jnz @true cx
+jz @false cx
+
+.true:
+const8 true.msg "true\n"
+movc cx @true.msg
+movc dx #true.msg
+jmp @print
+
+.false
+const8 false.msg "false\n"
+movc cx @false.msg
+movc dx #false.msg
+jmp @print
+
+.print:
+movc ax 1
+movc bx 1
+sys
+jmp @end
+
+.end:
+movc ax 0
+exit

examples/loop.tasm

@@ -1,12 +1,7 @@
 /*
-Example of graphical application
+Example of self-repeating code section
 */
 
 .main:
-
-le
-gt
-eq
-jif
-jel
+//TODO loop example
 exit

examples/stdout.tasm

@@ -4,7 +4,7 @@
 
 .data:
 // named array of 8-bit values
-const8 msg "Hello, World :3\n\0"
+const8 msg "Hello, World"
 
 .main:
 movc ax 1; // sys_write

src/instructions/impl/JMP.c

@@ -0,0 +1,40 @@
+#include "impl_macros.h"
+
+// JUMP [destination address]
+i32 JMP_impl(VM* vm){
+    u32 dst_addr = 0;
+    readVar(dst_addr);
+
+    vm->current_pos = dst_addr;
+
+    return sizeof(dst_addr);
+}
+
+
+// JNZ [destination address] [condition register]
+i32 JNZ_impl(VM* vm){
+    u32 dst_addr = 0;
+    readVar(dst_addr);
+    u8 cond_register_i = 0;
+    readRegisterVar(cond_register_i);
+    
+    if(vm->registers.array[cond_register_i].u32v0 != 0){
+        vm->current_pos = dst_addr;
+    }
+    
+    return sizeof(dst_addr) + sizeof(cond_register_i);
+}
+
+// JZ [destination address] [condition register]
+i32 JZ_impl(VM* vm){
+    u32 dst_addr = 0;
+    readVar(dst_addr);
+    u8 cond_register_i = 0;
+    readRegisterVar(cond_register_i);
+    
+    if(vm->registers.array[cond_register_i].u32v0 == 0){
+        vm->current_pos = dst_addr;
+    }
+    
+    return sizeof(dst_addr) + sizeof(cond_register_i);
+}

src/instructions/instructions.c

@@ -27,8 +27,8 @@ i32 XOR_impl(VM* vm);
 i32 AND_impl(VM* vm);
 
 i32 JMP_impl(VM* vm);
-i32 JIF_impl(VM* vm);
-i32 JEL_impl(VM* vm);
+i32 JNZ_impl(VM* vm);
+i32 JZ_impl(VM* vm);
 
 
 Array_declare(Instruction);
@@ -59,8 +59,8 @@ static const Array_Instruction instructions_array = ARRAY(Instruction, {
     Instruction_construct(AND),
     
     Instruction_construct(JMP),
-    Instruction_construct(JIF),
-    Instruction_construct(JEL),
+    Instruction_construct(JNZ),
+    Instruction_construct(JZ),
 });
 
 const Instruction* Instruction_getByOpcode(Opcode opcode){

src/instructions/instructions.h

@@ -32,8 +32,8 @@ typedef enum __attribute__((__packed__)) Opcode {
     Opcode_AND,
     
     Opcode_JMP,
-    Opcode_JIF,
-    Opcode_JEL,
+    Opcode_JNZ,
+    Opcode_JZ,
 } Opcode;
 
 typedef struct Instruction {