mirror of
https://github.com/radareorg/radare2.git
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291 lines
6.7 KiB
C
291 lines
6.7 KiB
C
/* pancake // nopcode.org 2022 -- esil emiter */
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#include <r_egg.h>
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#define attsyntax 0
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#define EMIT_NAME emit_esil
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#define R_ARCH "esil"
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#define R_SZ 8
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#define R_SP "SP"
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#define R_BP "BP"
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#define R_PC "PC"
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#define R_AX "A0"
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#define R_GP { "r0", "r1", "r2", "r3", "r4" }
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#define R_TMP "r9"
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#define R_NGP 5
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// no attsyntax for arm
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static char *regs[] = R_GP;
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static void emit_init(REgg *egg) {
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/* TODO */
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}
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static char *emit_syscall(REgg *egg, int num) {
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int svc = 0x80; // XXX
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return r_str_newf ("%d,A0,:=,%d,(),:=,", svc, num);
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}
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static void emit_frame(REgg *egg, int sz) {
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#if 0
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r_egg_printf (egg, " push {fp,lr}\n");
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if (sz > 0) {
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r_egg_printf (egg,
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// " mov "R_BP", "R_SP"\n"
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" add fp, sp, $4\n" // size of arguments
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" sub sp, %d\n", sz); // size of stackframe 8, 16, ..
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}
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#endif
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}
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static void emit_frame_end(REgg *egg, int sz, int ctx) {
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if (sz < 1 || ctx > 0) {
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sz = 8; // minimum stack frame size
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}
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r_egg_printf (egg, "FP,%d,+,SP,:=,", sz);
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}
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static void emit_comment(REgg *egg, const char *fmt, ...) {
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// comments are for the weak, esil dont need that
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}
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static void emit_equ(REgg *egg, const char *key, const char *value) {
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// should keep a K=V database for this no need to reflect that in esil
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// r_egg_printf (egg, ".equ %s, %s\n", key, value);
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}
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static void emit_syscall_args(REgg *egg, int nargs) {
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return;
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#if 0
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int j, k;
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for (j = 0; j < nargs; j++) {
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k = j * R_SZ;
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r_egg_printf (egg, " ldr %s, [sp, %d]\n",
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regs[j + 1], k? k + 4: k + 8);
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}
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#endif
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}
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static void emit_set_string(REgg *egg, const char *dstvar, const char *str, int j) {
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// not supported
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}
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static void emit_jmp(REgg *egg, const char *str, int atr) {
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if (atr) {
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r_egg_printf (egg, "%s,[%d],PC,:=", str, (egg->bits==64)?8:4);
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} else {
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r_egg_printf (egg, "%s,PC,:=", str);
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}
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}
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static void emit_call(REgg *egg, const char *str, int atr) {
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#if 0
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// thats not an esil primitive as the return value can be stored in a register or in the stack.. and this can be maybe specified in the calling convention rule
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int i;
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// r_egg_printf (egg, " ARGS=%d CALL(%s,%d)\n", lastarg, str, atr);
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for (i = 0; i < lastarg; i++) {
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r_egg_printf (egg, " ldr r%d, [%s]\n", lastarg - 1 - i, lastargs[i]);
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lastargs[i][0] = 0;
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}
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if (atr) {
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r_egg_printf (egg, " ldr r0, %s", str);
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r_egg_printf (egg, " blx r0\n");
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} else {
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r_egg_printf (egg, " bl %s\n", str);
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}
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#endif
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}
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static void emit_arg(REgg *egg, int xs, int num, const char *str) {
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#if 0
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int d = atoi (str);
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if (!attsyntax && (*str == '$')) {
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str++;
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}
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lastarg = num;
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switch (xs) {
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case 0:
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if (strchr (str, ',')) {
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// r_egg_printf (egg, ". str r0, [%s]\n", str);
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strncpy (lastargs[num - 1], str, sizeof (lastargs[0]) - 1);
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} else {
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if (!atoi (str)) {
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R_LOG_WARN ("probably a bug?");
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}
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r_egg_printf (egg, " mov r0, %s\n", str);
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snprintf (lastargs[num - 1], sizeof (lastargs[0]), "sp, %d", 8 + (num * 4));
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r_egg_printf (egg, " str r0, [%s]\n", lastargs[num - 1]);
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}
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break;
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case '*':
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r_egg_printf (egg, " push {%s}\n", str);
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break;
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case '&':
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if (d) {
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r_egg_printf (egg, " add "R_BP ", %d\n", d);
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}
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r_egg_printf (egg, " push { "R_BP " }\n");
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if (d) {
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r_egg_printf (egg, " sub "R_BP ", %d\n", d);
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}
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break;
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}
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#endif
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}
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static void emit_get_result(REgg *egg, const char *ocn) {
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// r_egg_printf (egg, " mov %s, r0\n", ocn);
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}
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static void emit_restore_stack(REgg *egg, int size) {
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// XXX: must die.. or add emit_store_stack. not needed by ARM
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// r_egg_printf (egg, " add sp, %d\n", size);
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}
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static void emit_get_while_end(REgg *egg, char *str, const char *ctxpush, const char *label) {
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// sprintf (str, " push {%s}\n b %s\n", ctxpush, label);
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}
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static void emit_while_end(REgg *egg, const char *labelback) {
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#if 0
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r_egg_printf (egg,
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" pop "R_AX "\n"
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" cmp "R_AX ", "R_AX "\n" // XXX MUST SUPPORT != 0 COMPARE HERE
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" beq %s\n", labelback);
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#endif
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}
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static void emit_get_var(REgg *egg, int type, char *out, int idx) {
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#if 0
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switch (type) {
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case 0: sprintf (out, "sp, %d", idx - 1); break;/* variable */
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case 1: sprintf (out, "r%d", idx); break; /* registers */
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// sp,$%d", idx); break; /* argument */ // XXX: MUST BE r0, r1, r2, ..
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}
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#endif
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}
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static void emit_trap(REgg *egg) {
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#if 0
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r_egg_printf (egg, " udf 16\n");
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#endif
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}
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static void emit_load_ptr(REgg *egg, const char *dst) {
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#if 0
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r_egg_printf (egg, " ldr r0, [fp, %d]\n", atoi (dst));
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#endif
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}
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static void emit_branch(REgg *egg, char *b, char *g, char *e, char *n, int sz, const char *dst) {
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#if 0
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char *p, str[64];
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char *arg = NULL;
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char *op = "beq";
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/* NOTE that jb/ja are inverted to fit cmp opcode */
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if (b) {
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*b = '\0';
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op = e? "bge": "bgt";
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arg = b + 1;
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} else if (g) {
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*g = '\0';
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op = e? "ble": "blt";
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arg = g + 1;
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}
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if (!arg) {
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if (e) {
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arg = e + 1;
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op = "bne";
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} else {
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arg = "0";
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op = n? "bne": "beq";
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}
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}
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if (*arg == '=') {
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arg++; /* for <=, >=, ... */
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}
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p = r_egg_mkvar (egg, str, arg, 0);
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r_egg_printf (egg, " pop "R_AX "\n"); /* TODO: add support for more than one arg get arg0 */
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r_egg_printf (egg, " cmp %s, "R_AX "\n", p);
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// if (context>0)
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r_egg_printf (egg, " %s %s\n", op, dst);
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free (p);
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#endif
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}
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static void emit_load(REgg *egg, const char *dst, int sz) {
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switch (sz) {
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case 'q':
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r_egg_printf (egg, "%s,[8],%s,:=,", dst, dst);
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break;
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case 'b':
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r_egg_printf (egg, "%s,[1],%s,:=,", dst, dst);
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break;
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default:
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r_egg_printf (egg, "%s,[4],%s,:=,", dst, dst);
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break;
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}
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}
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static void emit_mathop(REgg *egg, int ch, int vs, int type, const char *eq, const char *p) {
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char *op;
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switch (ch) {
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case '^': op = "^"; break;
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case '&': op = "&"; break;
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case '|': op = "|"; break;
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case '-': op = "-"; break;
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case '+': op = "+"; break;
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case '*': op = "*"; break;
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case '/': op = "/"; break;
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default: op = ":="; break;
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}
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if (!eq) {
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eq = R_AX;
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}
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eq = R_AX;
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if (!p) {
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p = R_AX;
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}
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#if 0
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// TODO:
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eprintf ("TYPE = %c\n", type);
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eprintf (" %s%c %c%s, %s\n", op, vs, type, eq, p);
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eprintf (" %s %s, [%s]\n", op, p, eq);
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#endif
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r_egg_printf (egg, "%s,%s,%s,%s,:=,", eq, p, op, p);
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}
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static const char *emit_regs(REgg *egg, int idx) {
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return regs[idx % R_NGP];
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}
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REggEmit EMIT_NAME = {
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.arch = R_ARCH,
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.size = R_SZ,
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.jmp = emit_jmp,
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.call = emit_call,
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.init = emit_init,
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.equ = emit_equ,
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.regs = emit_regs,
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// .sc = emit_sc,
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.trap = emit_trap,
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.frame = emit_frame,
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.frame_end = emit_frame_end,
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.comment = emit_comment,
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.push_arg = emit_arg,
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.restore_stack = emit_restore_stack,
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.get_result = emit_get_result,
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.syscall_args = emit_syscall_args,
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.set_string = emit_set_string,
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.get_var = emit_get_var,
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.while_end = emit_while_end,
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.get_while_end = emit_get_while_end,
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.branch = emit_branch,
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.load = emit_load,
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.load_ptr = emit_load_ptr,
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.mathop = emit_mathop,
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.syscall = emit_syscall,
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};
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