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Tool: added VM Test

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- includes a tiny demo for decoding secret messages
This commit is contained in:
CPunch
2022-04-29 15:51:59 -05:00
parent 36c3c8a65f
commit a4e04297a7
4 changed files with 72 additions and 3 deletions
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14
lib/include/lvm.h
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@@ -4,7 +4,9 @@
/* Laika VM:
This is an obfuscation technique where vital code can be executed in a
stack-based VM, inlined into the function. The VM instruction-set is fairly
simple, see the OP_* for avaliable opcodes and their expected arguments.
simple, see the OP_* enum for avaliable opcodes and their expected arguments.
The VM is turing-complete, however the instruction-set has been curated to
fit this specific use case.
*/
#include <inttypes.h>
@@ -44,8 +46,9 @@ enum {
OP_EXIT,
OP_LOADCONST, /* stk_indx[uint8_t] = const_indx[uint8_t] */
OP_PUSHLIT, /* stk_indx[uint8_t].i = uint8_t */
OP_READ, /* stk_indx[uint8_t] = *(int8_t*)stk_indx[uint8_t] */
OP_WRITE, /* *(uint8_t*)stk_indx[uint8_t] = stk_indx[uint8_t] */
OP_READ, /* stk_indx[uint8_t].i = *(int8_t*)stk_indx[uint8_t] */
OP_WRITE, /* *(uint8_t*)stk_indx[uint8_t].ptr = stk_indx[uint8_t].i */
OP_INCPTR, /* stk_indx[uint8_t].ptr++ */
/* arithmetic */
OP_ADD, /* stk_indx[uint8_t] = stk_indx[uint8_t] + stk_indx[uint8_t] */
@@ -102,6 +105,11 @@ LAIKA_FORCEINLINE void laikaV_execute(struct sLaikaV_vm *vm) {
*(uint8_t*)vm->stack[ptr].ptr = vm->stack[indx].i;
break;
}
case OP_INCPTR: {
uint8_t ptr = READBYTE;
vm->stack[ptr].ptr++;
break;
}
case OP_ADD: BINOP(+);
case OP_SUB: BINOP(-);
case OP_MUL: BINOP(*);