-#include <stdio.h>
#include <stdlib.h>
+#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <sysexits.h>
+#include "dcpu16.h"
+
/*
* emulates the DCPU16 system from http://0x10c.com/doc/dcpu-16.txt
*
* Justin Wind <justin.wind@gmail.com>
* 2012 04 05 - implementation started
* 2012 04 06 - first functionality achieved
+ * 2012 04 09 - minor cleanups
+ * 2012 04 10 - moved cli to separate module
*
* TODO
- * move cli driver to separate module
+ * drop checks for assigning to literals -- it won't affect anything anyhow
+ * debug short literal decoding
*/
static const char * const src_id_ = "$Id$";
-/* the target system's concept of a word */
#define WORD DCPU16_WORD
-typedef unsigned short WORD;
-#define RAM_SIZE 0x10000
static const char regnames_[] = "ABCXYZIJ";
-struct dcpu16 {
- unsigned long long cycle; /* number of cycles it took to get to current state */
- WORD reg_work_[2]; /* holding bins for literal values when decoding instructions */
- WORD reg[8]; /* system registers, a b c x y z i j */
- WORD pc; /* program counter */
- WORD sp; /* stack pointer */
- WORD o; /* overflow */
- unsigned int skip_ : 1; /* */
- WORD ram[RAM_SIZE]; /* memory */
-};
-static unsigned int trace_mode_ = 0; /* turn on for overly verbose internals */
+static unsigned int trace_mode_ = 0; /* spew overly verbose internals */
-#define WARN(...) warn(__VA_ARGS__)
-static inline void warn(char *fmt, ...) __attribute__((format(printf, 1, 2)));
-static inline void warn(char *fmt, ...) {
+#define WARN(...) do { if (warn_cb_) warn_cb_(__VA_ARGS__); } while (0)
+static inline void warn_(char *fmt, ...) __attribute__((format(printf, 1, 2)));
+static inline
+void warn_(char *fmt, ...) {
va_list ap;
- fprintf(stderr, "!!! ");
+ fprintf(stderr, "[warning] ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
fflush(stderr);
}
+static void (*warn_cb_)(char *fmt, ...) = warn_;
+void dcpu16_warn_cb_set(void (*fn)(char *fmt, ...)) {
+ warn_cb_ = fn;
+}
-
-#define TRACE(...) do { if (trace_mode_) trace(__VA_ARGS__); } while (0)
-static inline void trace(char *fmt, ...) __attribute__((format(printf, 1, 2)));
+#define TRACE(...) do { if (trace_cb_ && trace_mode_) trace_cb_(__VA_ARGS__); } while (0)
+static inline void trace_(char *fmt, ...) __attribute__((format(printf, 1, 2)));
static inline
-void trace(char *fmt, ...) {
+void trace_(char *fmt, ...) {
va_list ap;
+ fprintf(stdout, "[debug] ");
va_start(ap, fmt);
vfprintf(stdout, fmt, ap);
va_end(ap);
fprintf(stdout, "\n");
fflush(stdout);
}
+static void (*trace_cb_)(char *fmt, ...) = trace_;
+void dcpu16_trace_cb_set(void (*fn)(char *fmt, ...)) {
+ trace_cb_ = fn;
+}
-/* sets *v to be the destination of the value */
-/* workv is buffer to use to accumulate literal value before use */
-/* returns true if destination points to literal (id est *v should ignore writes) */
+/* value_decode_
+ * sets *v to be the destination of the value
+ * workv is buffer to use to accumulate literal value before use
+ * returns true if destination points to literal (id est *v should ignore writes)
+ */
static unsigned int value_decode(struct dcpu16 *d, WORD value, WORD *work_v, WORD **v) {
WORD nextword;
unsigned int retval = 0;
- assert(value >= 0x00 && value <= 0x3f);
+ assert(value <= 0x3f);
/* does this value indicate a literal */
if (value >= 0x1f)
#define OP_IMPL(x) static void op_##x(struct dcpu16 *d, WORD val_a, WORD val_b)
-#define OP_NBI_ (void)val_b
+#define OP_NBI_ (void)val_b, (void)b
#define OP_BASIC_ (void)value_decode(d, val_b, &d->reg_work_[0], &b)
#define OP_TYPE(op_type) WORD *a, *b;\
unsigned int lit_a;\
do {\
- assert(d != NULL);\
lit_a = value_decode(d, val_a, &d->reg_work_[0], &a);\
op_type;\
if (d->skip_) {\
return;\
}\
} while (0)
-
-
-#define OP_BASIC(x) WORD *a, *b;\
- unsigned int lit_a;\
- do {\
- assert(d != NULL);\
- lit_a = value_decode(d, val_a, &d->reg_work_[0], &a);\
- value_decode(d, val_b, &d->reg_work_[1], &b);\
- if (d->skip_) {\
- TRACE("++ SKIPPED");\
- d->skip_ = 0;\
- return;\
- }\
- } while(0)
-
-#define OP_NBI(x) WORD *a;\
- unsigned int lit_a;\
- do {\
- assert(d != NULL);\
- lit_a = value_decode(d, val_a, &d->reg_work_[0], &a);\
- (void)val_b;\
- if (d->skip_) {\
- TRACE("++ SKIPPED");\
- d->skip_ = 0;\
- return;\
- }\
- } while(0)
+#define OP_BASIC(x) OP_TYPE(OP_BASIC_)
+#define OP_NBI(x) OP_TYPE(OP_NBI_)
/* extended opcodes */
instructions only have one operand.
*/
OP_IMPL(_nbi_) {
- assert(d != NULL);
/* non-basic instruction */
/* don't do normal value decoding here */
}
}
-void dump_instruction(struct dcpu16 *d, WORD addr) {
+void dcpu16_disassemble_print(struct dcpu16 *d, WORD addr) {
WORD opcode, a, b;
unsigned int instr_len = 1;
const struct opcode_entry *e;
a = (d->ram[addr] >> (OPCODE_BASIC_SHIFT + OPCODE_BASIC_BITS)) & ((1 << 6) - 1);
b = (d->ram[addr] >> (OPCODE_BASIC_SHIFT + OPCODE_BASIC_BITS + 6)) & ((1 << 6) - 1);
- assert(opcode < 0x0f);
- assert(a < 0x3f);
- assert(b < 0x3f);
+ assert(opcode <= 0x0f);
+ assert(a <= 0x3f);
+ assert(b <= 0x3f);
- printf("next instr 0x%04x: %04x", addr, d->ram[addr]);
+ printf(" next instr 0x%04x: %04x", addr, d->ram[addr]);
if (opcode != 0)
{
e = opcode_basic_entries + opcode;
else
e = opcode_nbi_entries + ( (a < OPCODE_NBI_MAX) ? a : (OPCODE_NBI_MAX - 1) );
- printf("\n\t%s", e->name);
+
+ printf("%s%s ; %s",
+ instr_len < 3 ? " " : "",
+ instr_len < 2 ? " " : "",
+ e->name);
if (opcode != 0) {
dump_value(a, d->ram[addr + 1]);
if (a == 0x1e || a == 0x1f)
printf("\n");
}
-void dcpu16_execute_next_instruction(struct dcpu16 *d) {
+void dcpu16_step(struct dcpu16 *d) {
WORD opcode;
WORD val_a, val_b;
const struct opcode_entry *e;
- /* fetch next instruction */
- if (d->pc > RAM_SIZE) { /* currently impossible */
- WARN("%s beyond %u", "PC", RAM_SIZE);
- /* d->pc %= RAM_SIZE; */
- }
+ /* decode opcode and invoke */
opcode = (d->ram[ d->pc ] >> OPCODE_BASIC_SHIFT) & ((1 << OPCODE_BASIC_BITS) - 1);
val_a = (d->ram[d->pc] >> (OPCODE_BASIC_SHIFT + OPCODE_BASIC_BITS)) & ((1 << 6) - 1);
}
}
-static void usage(char *prog, unsigned int full) {
- FILE *f = full ? stdout : stderr;
- char *x = strrchr(prog, '/');
-
- if (x && *(x + 1))
- prog = x + 1;
-
- if (full)
- fprintf(f, "%s -- \n\n",
- prog);
-
- fprintf(f, "Usage: %s\n",
- prog);
-
- if (full) {
- fprintf(f, "\nOptions:\n"
- "\t-h -- this screen\n");
-
- fprintf(f, "\n%78s\n", src_id_);
- }
-}
-
-static int file_load(struct dcpu16 *d, char *filename) {
- FILE *f;
- size_t r;
-
- f = fopen(filename, "rb");
- if (f == NULL)
- {
- fprintf(stderr, "%s(%s):%s\n", "fopen", filename, strerror(errno));
- return -1;
- }
-
- r = fread(d->ram, sizeof(WORD), RAM_SIZE, f);
- TRACE("read %zu words", r);
-
- if (ferror(f)) {
- fprintf(stderr, "%s():%s\n", "fread", strerror(errno));
- }
-
- fclose(f);
- return 0;
-}
-
-static void testprog_load(struct dcpu16 *d) {
- static WORD bin[] = {
- 0x7c01, 0x0030, 0x7de1, 0x1000, 0x0020, 0x7803, 0x1000, 0xc00d,
- 0x7dc1, 0x001a, 0xa861, 0x7c01, 0x2000, 0x2161, 0x2000, 0x8463,
- 0x806d, 0x7dc1, 0x000d, 0x9031, 0x7c10, 0x0018, 0x7dc1, 0x001a,
- 0x9037, 0x61c1, 0x7dc1, 0x001a, 0x0000
- };
- size_t i;
-
- printf("loading...\n");
- for (i = 0; i < (sizeof(bin) / sizeof(WORD)); i++)
- {
- printf(" %04x", bin[i]);
- d->ram[i] = bin[i];
- }
- printf("\nloaded 0x%04zx words\n", i - 1);
-}
-
-static
-void dump_cpu_state(struct dcpu16 *d) {
+void dcpu16_state_print(struct dcpu16 *d) {
unsigned int i;
- printf("[--- cycle:0x%08llx %2s:0x%04x %2s:0x%04x %2s:0x%04x\n",
+ printf("---- cycle:0x%08llx %2s:0x%04x %2s:0x%04x %2s:0x%04x\n",
d->cycle,
"PC", d->pc,
"SP", d->sp,
printf("\n");
}
-static
-void dump_ram(struct dcpu16 *d, WORD start, WORD stop) {
+void dcpu16_dump_ram(struct dcpu16 *d, WORD start, WORD stop) {
unsigned int i, j;
const unsigned int n = 8; /* words per line */
}
}
+/* dcpu16_new
+ * allocate a new dcpu16 instance
+ */
+struct dcpu16 *dcpu16_new(void) {
+ struct dcpu16 *vm;
-int main(int argc, char **argv) {
- struct dcpu16 *m;
- int c;
- char buf[512];
-
- m = calloc(1, sizeof *m);
- if (m == NULL)
- {
- fprintf(stderr, "%s:%s\n", "calloc", strerror(errno));
- exit(EX_OSERR);
- }
-
- while ( (c = getopt(argc, argv, "ht")) != EOF )
- {
- switch (c)
- {
- case 't':
- trace_mode_ = 1;
- dump_ram(m, 0, 0x001f);
- testprog_load(m);
- dump_ram(m, 0, 0x001f);
- break;
-
- case 'h':
- usage(argv[0], 1);
- exit(EX_OK);
-
- default:
- usage(argv[0], 0);
- exit(EX_USAGE);
- }
- }
-
- if (argc - optind)
- {
- /* read file */
- file_load(m, argv[optind]);
- }
-
- dump_cpu_state(m);
- while (fgets(buf, sizeof buf, stdin)) {
- dcpu16_execute_next_instruction(m);
- dump_cpu_state(m);
- if (trace_mode_)
- dump_instruction(m, m->pc);
- }
+ vm = calloc(1, sizeof *vm);
+ if (vm == NULL)
+ WARN("%s: %s(%zu): %s", __func__, "calloc", strerror(errno));
- free(m);
+ return vm;
+}
- exit(EX_OK);
+/* dcpu16_delete
+ * release a dcpu16 instance
+ */
+void dcpu16_delete(struct dcpu16 **vm) {
+ free(*vm);
+ *vm = NULL;
}
projects / dcpu16 / blobdiff