Initial commit

Added base code, can run ELF files and simulate RV32I instructions
2023-10-04 21:28:18 +02:00
commit 981c35584c
17 changed files with 1280 additions and 0 deletions
@@ -0,0 +1,178 @@
+/*
+ * Command-line option parsing
+ */
+#include "vriscv.h"
+
+#define OPTION_SEPARATOR "-"
+
+uint64_t memory_size = 512 * 1024 * 1024;
+char* file_path;
+
+static void print_usage();
+static void print_help();
+static void print_version();
+
+static int parse_long_option(char* str, char* argq);
+
+void parse_options(int argc, char** argv)
+{
+	for(int i = 1; i < argc; i++)
+	{
+		// Start option parsing for argument 'i'
+		if(argv[i][0] != *OPTION_SEPARATOR) continue;
+
+		// Check for long options
+		if(argv[i][1] == *OPTION_SEPARATOR)
+		{
+			i += parse_long_option(argv[i] + 2, argv[i + 1]);
+			continue;
+		}
+
+		// Parse short options
+		int k = 1;
+		while(argv[i][k])
+		{
+			switch(argv[i][k])
+			{
+				case 'h':
+				case '?':
+				{
+					print_help();
+					exit(0);
+				}
+				case 'v':
+				{
+					print_version();
+					exit(0);
+				}
+				case 'm':
+				{
+					// First try to convert next chars into int (ex. -m512)
+					char* end;
+					memory_size = strtol(&argv[i][k + 1], &end, 10);
+					if(*end != '\0' || end == &argv[i][k + 1])
+					{
+						if(argv[i][k + 1])
+						{
+							fprintf(stderr, "Error: Option -m needs an argument, but you used -m in a group of options without an integer next to it\n");
+							exit(EXIT_FAILURE);
+						}
+
+						// Try to parse next arg as integer
+						if(argc <= i + 1)
+						{
+							fprintf(stderr, "Error: Option " OPTION_SEPARATOR "m needs an argument\n");
+							exit(EXIT_FAILURE);
+						}
+
+						memory_size = strtol(argv[i + 1], &end, 10);
+						if(*end != '\0')
+						{
+							fprintf(stderr, "Error: Invalid argument '%s' for option " OPTION_SEPARATOR "m\n", argv[i + 1]);
+							exit(EXIT_FAILURE);
+						}
+						else
+						{
+							i++;
+							k = strlen(argv[i]) - 1;
+						}
+					}
+					else k += (end - &argv[i][k + 1]);
+
+					if(memory_size <= 0)
+					{
+						fprintf(stderr, "Error: Memory size needs to be > 0\n");
+						exit(EXIT_FAILURE);
+					}
+
+					if(memory_size > 4096)
+					{
+						fprintf(stderr, "Error: Cannot address more than 4 GiB of memory on 32-bits !\n");
+						exit(EXIT_FAILURE);
+					}
+					memory_size *= 1024 * 1024;
+
+					break;
+				}
+				default:
+				{
+					fprintf(stderr, "Error: Unknown short option -%c\n", argv[i][k]);
+					exit(EXIT_FAILURE);
+				}
+			}
+			k++;
+		}
+	}
+
+	if(argc <= 1)
+	{
+		print_usage();
+		exit(EXIT_FAILURE);
+	}
+	else file_path = argv[argc - 1];
+}
+
+static int parse_long_option(char* str, char* argq)
+{
+	if(strcmp(str, "help") == 0)
+	{
+		print_help();
+		exit(0);
+	}
+	else if(strcmp(str, "version") == 0)
+	{
+		print_version();
+		exit(0);
+	}
+	else if(strcmp(str, "memory") == 0)
+	{
+		if(argq == NULL)
+		{
+			fprintf(stderr, "Error: No argument given for option " OPTION_SEPARATOR "-memory\n");
+			exit(EXIT_FAILURE);
+		}
+
+		// Convert argument to integer
+		char* end;
+		memory_size = strtol(argq, &end, 10);
+		if(*end != '\0')
+		{
+			fprintf(stderr, "Error: Invalid argument '%s' for option " OPTION_SEPARATOR "-memory\n", argq);
+			exit(EXIT_FAILURE);
+		}
+
+		if(memory_size > 4096)
+		{
+			fprintf(stderr, "Error: Cannot address more than 4 GiB of memory on 32-bits !\n");
+			exit(EXIT_FAILURE);
+		}
+		memory_size *= 1024 * 1024;
+
+		return 1;
+	}
+	else
+	{
+		fprintf(stderr, "Error: Unknown long option " OPTION_SEPARATOR OPTION_SEPARATOR "%s\n", str);
+		exit(EXIT_FAILURE);
+	}
+}
+
+static void print_usage()
+{
+	printf("Usage: %s [options] <elf-file>\n", CURRENT_NAME);
+}
+
+static void print_help()
+{
+	print_usage();
+
+	printf("Options:\n");
+	printf("  " OPTION_SEPARATOR "h, " OPTION_SEPARATOR "?, --help\t\tPrint this help message\n");
+	printf("  " OPTION_SEPARATOR "v, --version\t\t\tPrint version information\n");
+	printf("  " OPTION_SEPARATOR "m, --memory\t\t\tSet the simulated memory size, in MiB\n");
+}
+
+static void print_version()
+{
+	printf("%s (%s) version %s\n", CURRENT_NAME, NAME, VERSION);
+}