Merge pull request #171 from shenki/mw-debug-features

mw debug features

scripts/mw_debug/Makefile

@@ -1,9 +1,10 @@
 CFLAGS = -O2 -g -Wall -std=c99
+# CFLAGS +=  -I urjtag/urjtag/include/ -L urjtag/urjtag/src/.libs/
 
 all: mw_debug
 
 mw_debug: mw_debug.c
-	$(CC) -o $@ $^ -lurjtag
+	$(CC) -o $@ $^ $(CFLAGS) -lurjtag
 
 clean:
 	rm -f mw_debug

scripts/mw_debug/README

@@ -0,0 +1,63 @@
+mw_debug is the microwatt debugger.
+
+It can talk to the simulator using a socket.
+
+On an Arty board it uses the FTDI device via liburjtag.
+
+## Building on Fedora
+
+```
+dnf install urjtag-devel
+make
+```
+
+If you commonly use it against one target, create an alias as follows:
+```
+alias mw="$HOME/microwatt/scripts/mw_debug/mw_debug -b jtag"
+$ mw gpr 0 10
+Connected to libftdi driver.
+Found device ID: 0x0362d093
+r0:	0000000000001094
+r1:	0000000000001ed0
+r2:	000000000000a000
+r3:	0000000000000003
+r4:	000000000000000d
+r5:	00000000ffff2ca5
+r6:	00000000ffff3eb8
+r7:	0000000000000000
+r8:	00000000ffff3c33
+r9:	0000000000000003
+Core: running
+ NIA: 00000000000011d4
+ MSR: 8000000000000001
+```
+
+## Building on Debian
+
+Debian disables the library in the urjtag package. Instead, build against
+local urjtag:
+
+```
+sudo apt install libftdi-dev
+git clone https://git.code.sf.net/p/urjtag/git urjtag
+cd urjtag/urjtag
+./autogen.sh
+make
+```
+
+And then uncomment the following line in Makefile to build against that copy
+
+```
+CFLAGS +=  -I urjtag/urjtag/include/ -L urjtag/urjtag/src/.libs/
+```
+
+To run:
+```
+alias mw="LD_LIBRARY_PATH=$HOME/microwatt/scripts/mw_debug/urjtag/urjtag/src/.libs/ $HOME/microwatt/scripts/mw_debug/mw_debug -b jtag"
+$ mw
+Connected to libftdi driver.
+Found device ID: 0x0362d093
+Core: running
+ NIA: 00000000000011b8
+ MSR: 8000000000000001
+```

scripts/mw_debug/mw_debug.c

@@ -1,3 +1,6 @@
+#define _POSIX_C_SOURCE 200809L
+#define _GNU_SOURCE
+
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -15,6 +18,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <urjtag/urjtag.h>
+#include <inttypes.h>
 
 #define DBG_WB_ADDR		0x00
 #define DBG_WB_DATA		0x01
@@ -104,6 +108,7 @@ static int sim_init(const char *target)
 
 static int sim_reset(void)
 {
+	return 0;
 }
 
 static void add_bits(uint8_t **p, int *b, uint64_t d, int c)
@@ -152,7 +157,7 @@ static int sim_command(uint8_t op, uint8_t addr, uint64_t *data)
 {
 	uint8_t buf[16], *p;
 	uint64_t d = data ? *data : 0;
-	int r, s, b = 0;
+	int r, b = 0;
 
 	memset(buf, 0, 16);
 	p = buf+1;
@@ -280,6 +285,7 @@ static int jtag_init(const char *target)
 
 static int jtag_reset(void)
 {
+	return 0;
 }
 
 static int jtag_command(uint8_t op, uint8_t addr, uint64_t *data)
@@ -382,8 +388,8 @@ static void core_status(void)
 	else if (stat & DBG_CORE_STAT_TERM)
 		statstr = "odd state (TERM but no STOP)";
 	printf("Core: %s%s\n", statstr, statstr2);
-	printf(" NIA: %016llx\n", (unsigned long long)nia);
+	printf(" NIA: %016" PRIx64 "\n", nia);
-	printf(" MSR: %016llx\n", msr);
+	printf(" MSR: %016" PRIx64 "\n", msr);
 }
 
 static void core_stop(void)
@@ -438,12 +444,12 @@ static void gpr_read(uint64_t reg, uint64_t count)
 		data = 0xdeadbeef;
 		check(dmi_read(DBG_CORE_GSPR_DATA, &data), "reading GPR data");
 		if (reg <= 31)
-			printf("r%d", reg);
+			printf("r%"PRId64, reg);
 		else if ((reg - 32) < sizeof(fast_spr_names) / sizeof(fast_spr_names[0]))
 			printf("%s", fast_spr_names[reg - 32]);
 		else
-			printf("gspr%d", reg);
+			printf("gspr%"PRId64, reg);
-		printf(":\t%016llx\n", data);
+		printf(":\t%016"PRIx64"\n", data);
 	}
 }
 
@@ -505,7 +511,33 @@ static void load(const char *filename, uint64_t addr)
 
 static void usage(const char *cmd)
 {
-	fprintf(stderr, "Usage: %s <command> <args>\n", cmd);
+	fprintf(stderr, "Usage: %s -b <jtag|sim> <command> <args>\n", cmd);
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, " CPU core:\n");
+	fprintf(stderr, "  start\n");
+	fprintf(stderr, "  stop\n");
+	fprintf(stderr, "  step\n");
+	fprintf(stderr, "  creset			core reset\n");
+	fprintf(stderr, "  icreset			icache reset\n");
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, " Memory:\n");
+	fprintf(stderr, "  mr <hex addr>\n");
+	fprintf(stderr, "  mw <hex addr> <hex value>\n");
+	fprintf(stderr, "  load <file> [addr]		If omitted address is 0\n");
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, " Registers:\n");
+	fprintf(stderr, "  gpr <reg> [count]\n");
+	fprintf(stderr, "  status\n");
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, " JTAG:\n");
+	fprintf(stderr, "  dmiread <hex addr>\n");
+	fprintf(stderr, "  dmiwrite <hex addr> <hex value>\n");
+	fprintf(stderr, "  quit\n");
+
 	exit(1);
 }