Add preliminary version of s51, a UI clone of the 8051 emulator.

sdcdb provides source-level debugging using the 8051 emulator, s51. By
emulating that emulator a the UI level, we should be able to get source
debugging right on our target platform.

This is just the preliminary structure for the program with most commands
not yet implemented.

1 files changed, 232 insertions, 0 deletions

diff --git a/s51/s51-parse.c b/s51/s51-parse.c
new file mode 100644
index 00000000..ba0d611c
--- /dev/null
+++ b/s51/s51-parse.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "s51.h"
+
+struct command_function {
+	char			*name;
+	char			*alias;
+	enum command_result	(*func)(FILE *output, int argc, char **argv);
+	char			*usage;
+	char			*help;
+};
+
+static struct command_function functions[] = {
+	{ "help",   "?",  command_help,	"help",		"Print this list\n" },
+	{ "quit",   "q",  command_quit,	"[q]uit",	"Quit\n" },
+	{ "di",	    "di", command_di,	"di <start> <end>",
+		"Dump imem\n" },
+	{ "ds",	    "ds", command_ds,	"ds <start> <end>",
+		"Dump sprs\n" },
+	{ "dx",	    "dx", command_dx,	"dx <start> <end>",
+		"Dump xaddr\n" },
+	{ "set",    "t",  command_set,	"se[t] mem <prefix> <start> <end>",
+		"Set mem {xram|rom|iram|sfr} <start> <end>\n"
+		"set bit <addr>\n" },
+	{ "dump",   "d",  command_dump,	"[d]ump <prefix> <start> <end>",
+		"Dump {xram|rom|iram|sfr} <start> <end>\n" },
+	{ "pc",	    "p",  command_pc, "[p]c [addr]",
+		"Get or set pc value\n" },
+	{ "break",  "b",  command_break,"[b]reak <addr>",
+		"Set break point\n" },
+	{ "clear",  "c",  command_clear,"[c]lear <addr>",
+		"Clear break point\n" },
+	{ "run",    "r",  command_run, "[r]un [start] [stop]",
+		"Run with optional start and temp breakpoint addresses\n" },
+	{ "next",   "n",  command_next, "[n]ext",
+		"Step over one instruction, past any call\n" },
+	{ "step",   "s",  command_step, "[s]tep",
+		"Single step\n" },
+	{ "load",   "l",  command_load, "[l]oad <file>",
+		"Load a hex file into memory or flash" },
+	{ "halt",   "h",  command_halt, "[h]alt",
+		"Halt the processor\n" },
+	{ "reset","res",command_reset,	"[res]et",
+		"Reset the CPU\n" },
+};
+
+#define NUM_FUNCTIONS (sizeof functions / sizeof functions[0])
+
+#ifndef FALSE
+#define FALSE 0
+#define TRUE 1
+#endif
+
+static int
+string_to_int(char *s, int *v)
+{
+	char *endptr;
+
+	if (isdigit(s[0]) || s[0] == '-' || s[0] == '+') {
+		*v = strtol(s, &endptr, 0);
+		if (endptr == s)
+			return FALSE;
+	} else if (*s == '\'') {
+		s++;
+		if (*s == '\\') {
+			s++;
+			switch (*s) {
+			case 'n':
+				*v = '\n';
+				break;
+			case 't':
+				*v = '\t';
+				break;
+			default:
+				*v = (int) *s;
+				break;
+			}
+		} else
+			*v = (int) *s;
+		s++;
+		if (*s != '\'')
+			return FALSE;
+	}
+	else
+		return FALSE;
+    return TRUE;
+}
+
+static struct command_function *
+command_string_to_function(char *name)
+{
+	int i;
+	for (i = 0; i < NUM_FUNCTIONS; i++)
+		if (!strcmp(name, functions[i].name) ||
+		    !strcmp(name, functions[i].alias))
+			return &functions[i];
+	return NULL;
+}    
+
+static int
+command_split_into_words(char *line, char **argv)
+{
+	char quotechar;
+	int argc;
+
+	argc = 0;
+	while (*line) {
+		while (isspace(*line))
+			line++;
+		if (!*line)
+			break;
+		if (*line == '"') {
+			quotechar = *line++;
+			*argv++ = line;
+			argc++;
+			while (*line && *line != quotechar)
+				line++;
+			if (*line)
+				*line++ = '\0';
+		} else {
+			*argv++ = line;
+			argc++;
+			while (*line && !isspace(*line))
+				line++;
+			if (*line)
+				*line++ = '\0';
+		}
+	}
+	*argv = 0;
+	return argc;
+}
+
+enum command_result
+command_help(FILE *output, int argc, char **argv)
+{
+	int i;
+	struct command_function *func;
+
+	if (argc == 1) {
+		for (i = 0; i < NUM_FUNCTIONS; i++)
+			fprintf(output, "%-10s%s\n", functions[i].name,
+			       functions[i].usage);
+	} else {
+		for (i = 1; i < argc; i++) {
+			func = command_string_to_function(argv[i]);
+			if (!func) {
+				fprintf(output, "%-10s unknown command\n", argv[i]);
+				return command_syntax;
+			}
+			fprintf(output, "%-10s %s\n%s", func->name,
+			       func->usage, func->help);
+		}
+	}
+	return command_debug;
+}
+    
+static void
+command_syntax_error(FILE *output, int argc, char **argv)
+{
+	fprintf(output, "Syntax error in:");
+	while (*argv)
+		fprintf(output, " %s", *argv++);
+	fprintf(output, "\n");
+}
+
+void
+command_read (FILE *input, FILE *output)
+{
+	int argc;
+	char line[1024];
+	char *argv[20];
+	enum command_result result;
+	struct command_function *func;
+
+	s51_dbg = ccdbg_open ();
+	if (!s51_dbg) {
+		perror("ccdbg_open");
+		exit(1);
+	}
+	ccdbg_debug_mode(s51_dbg);
+	fprintf(output, "Welcome to the non-simulated processor\n");
+	for (;;) {
+		if (s51_prompt)
+			fprintf(output, "%s", s51_prompt);
+		else
+			putc('\0', output);
+		fflush(output);
+		if (!fgets (line, sizeof line, input))
+			break;
+		argc = command_split_into_words(line, argv);
+		if (argc > 0) {
+			func = command_string_to_function(argv[0]);
+			if (!func)
+				command_syntax_error(output, argc, argv);
+			else
+			{
+				result = (*func->func)(output, argc, argv);
+				switch (result) {
+				case command_syntax:
+					command_syntax_error(output, argc, argv);
+					break;
+				case command_error:
+					fprintf(output, "Error\n");
+					break;
+				case command_proceed:
+					break;
+				default:
+					break;
+				}
+			}
+		}
+	}
+	ccdbg_close(s51_dbg);
+	fprintf(output, "...\n");
+}
+