radare2/libr/core/hack.c
pancake d2b6828bab * Fix some warnings reported by the farm
* Do not prompt or clear screen when using V in batch mode
* Optimization in r_config_get_i
* Show expression in r_num_calc errors
* Fix parsing of $$+2 in r_num_calc
2012-02-15 00:17:31 +01:00

68 lines
2.0 KiB
C

/* radare - LGPL - Copyright 2011-2012 // pancake<nopcode.org> */
#include <r_core.h>
R_API void r_core_hack_help(RCore *core) {
eprintf ("wao [op] ; performs a modification on current opcode\n"
" nop : replace current opcode with\n"
" jz : make current opcode conditional (zero)\n"
" jnz : make current opcode conditional (not zero)\n"
" un-cjmp : remove conditional operation to branch\n"
" swap-cjmp : swap conditional branch\n"
"NOTE: those operations are only implemented for x86 atm. (TODO)\n");
}
// TODO: needs refactoring to make it cross-architecture
R_API int r_core_hack(RCore *core, const char *op) {
ut8 *b = core->block;
RAnalOp analop;
if (strstr (r_config_get (core->config, "asm.arch"), "x86"))
eprintf ("TODO: write hacks are only for x86\n");
if (!r_anal_op (core->anal, &analop, core->offset, core->block, core->blocksize)) {
eprintf ("anal op fail\n");
return R_FALSE;
}
if (!strcmp (op, "nop")) {
int nopsize = 1; // XXX x86 only
const char *nopcode = "90"; // XXX x86 only
int len = analop.length;
if (len%nopsize) {
eprintf ("Invalid nopcode length\n");
return R_FALSE;
}
r_cons_puts ("wx ");
do r_cons_puts (nopcode);
while (len-=nopsize);
r_cons_puts ("\n");
return R_TRUE;
} else
if (!strcmp (op, "jz")) {
if (b[0] == 0x75) {
r_cons_puts ("wx 74\n");
return R_TRUE;
} else eprintf ("Current opcode is not conditional\n");
} else
if (!strcmp (op, "jnz")) {
if (b[0] == 0x74) {
r_cons_puts ("wx 75\n");
return R_TRUE;
} else eprintf ("Current opcode is not conditional\n");
return R_TRUE;
} else
if (!strcmp (op, "un-cjmp")) {
if (b[0] >= 0x70 && b[0] <= 0x7f) {
r_cons_puts ("wx eb\n");
return R_TRUE;
} else eprintf ("Current opcode is not conditional\n");
} else
if (!strcmp (op, "swap-cjmp")) {
if (b[0] == 0x74)
r_cons_puts ("wx 75\n");
else
if (b[0] == 0x75)
r_cons_puts ("wx 74\n");
else eprintf ("Invalid opcode\n");
// XXX. add support for jb, jg, jl, ..
} else eprintf ("Invalid operation\n");
return R_FALSE;
}