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https://github.com/radareorg/radare2.git
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126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/* radare - LGPL - Copyright 2014 - pancake */
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#include <r_reg.h>
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#undef Z
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#undef S
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#undef C
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#undef O
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#undef P
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#define Z f->z
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#define S f->s
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#define C f->c
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#define O f->o
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#define P f->p
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// old new
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// XXX: word size matters
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// TODO: needs more rethinking
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/*
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R_API int r_reg_cond_set(RReg *reg, ut64 o, ut64 n, int nsz, RRegFlags *f) {
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Z = n? 0: 1;
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S = 0;
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C = 0; // TODO
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O = 0;
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P = n&1;
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}
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*/
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R_API RRegItem *r_reg_cond_get(RReg *reg, const char *name) {
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int i = R_REG_TYPE_GPR;
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RListIter *iter;
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RRegItem *r;
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if (name) {
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r_list_foreach (reg->regset[i].regs, iter, r) {
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if (r->flags && !strcmp (name, r->flags))
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return r;
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}
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}
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return NULL;
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}
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R_API int r_reg_cond_get_value(RReg *r, const char *name) {
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return (int)r_reg_get_value (r, r_reg_cond_get (r, name))? 1: 0;
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}
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R_API const char *r_reg_cond_to_string(int n) {
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const char *cs[] = {
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"eq", "ne", "cf", "neg", "of", "hi", "he",
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"lo", "loe", "ge", "gt", "lt", "le"};
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if (n < 0 || (n > (sizeof (cs) / sizeof (*cs)) - 1))
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return NULL;
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return cs[n];
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}
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R_API int r_reg_cond_from_string(const char *str) {
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if (!strcmp (str, "eq")) return R_REG_COND_EQ;
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if (!strcmp (str, "ne")) return R_REG_COND_NE;
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if (!strcmp (str, "cf")) return R_REG_COND_CF;
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if (!strcmp (str, "neg")) return R_REG_COND_NEG;
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if (!strcmp (str, "of")) return R_REG_COND_OF;
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if (!strcmp (str, "hi")) return R_REG_COND_HI;
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if (!strcmp (str, "he")) return R_REG_COND_HE;
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if (!strcmp (str, "lo")) return R_REG_COND_LO;
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if (!strcmp (str, "loe")) return R_REG_COND_LOE;
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if (!strcmp (str, "ge")) return R_REG_COND_GE;
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if (!strcmp (str, "gt")) return R_REG_COND_GT;
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if (!strcmp (str, "lt")) return R_REG_COND_LT;
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if (!strcmp (str, "le")) return R_REG_COND_LE;
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eprintf ("| Usage: drc [condition]\n"
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"| eq equal\n"
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"| ne not equal\n"
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"| cf carry flag set\n"
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"| neg negative value (has sign)\n"
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"| of overflow\n"
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"|unsigned:\n"
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"| hi higher\n"
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"| he higher or equal\n"
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"| lo lower\n"
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"| loe lower or equal\n"
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"|signed:\n"
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"| ge greater or equal\n"
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"| gt greater than\n"
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"| le less or equal\n"
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"| lt less than\n");
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return -1;
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}
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R_API int r_reg_cond_bits(RReg *r, int type, RRegFlags *f) {
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switch (type) {
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case R_REG_COND_EQ: return Z;
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case R_REG_COND_NE: return !Z;
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case R_REG_COND_CF: return C;
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case R_REG_COND_NEG: return S;
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case R_REG_COND_OF:
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return O;
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// unsigned
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case R_REG_COND_HI: return (!Z && C); // HIGUER
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case R_REG_COND_HE: return Z || (!Z && C); // HIGUER OR EQUAL
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case R_REG_COND_LO: return (Z || !C); // LOWER
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case R_REG_COND_LOE:
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return (Z || !C); // LOWER OR EQUAL
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// signed
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case R_REG_COND_GE: return ((S && O) || (!S && !O));
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case R_REG_COND_GT: return ((S && !Z && O) || (!S && !Z && !O));
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case R_REG_COND_LT: return ((S && !O) || (!S && O));
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case R_REG_COND_LE: return (Z || (S && !O) || (!S && O));
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}
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return R_FALSE;
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}
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R_API int r_reg_cond(RReg *r, int type) {
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RRegFlags f = { 0 };
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r_reg_cond_retrieve (r, &f);
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return r_reg_cond_bits (r, type, &f);
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}
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R_API RRegFlags *r_reg_cond_retrieve(RReg *r, RRegFlags *f) {
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if (!f) f = R_NEW0 (RRegFlags);
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f->s = r_reg_cond_get_value (r, "sign"); // sign, negate flag, less than zero
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f->z = r_reg_cond_get_value (r, "zero"); // zero flag
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f->c = r_reg_cond_get_value (r, "carry"); // carry flag
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f->o = r_reg_cond_get_value (r, "overflow"); // overflow flag
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f->p = r_reg_cond_get_value (r, "parity"); // parity // intel only
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return f;
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}
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