9os

commit f414d8cb32f4fdb42f59a9ce02873b9c18418284
parent be320a82eeeeed047f80eae043750ed493d2fe76
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 18 Oct 2020 10:05:49 +0200

os9/dlang: Add X command

X command has sane syntax than adb() command and
it can be used to debug panics.

Change-Id: Id3b9263ce007f40cc77f5017cbe3fd9086cc77bb

Diffstat:
M
src/os9/dlang.c
 | 
54
++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 54 insertions(+), 0 deletions(-)
diff --git a/src/os9/dlang.c b/src/os9/dlang.c
@@ -192,6 +192,53 @@ err:
 	return 0;
 }
 
+static int
+do_x(const struct cmd *cmd, struct args *args)
+{
+	char *p, *s;
+	int n;
+	void *addr;
+	size_t len;
+	uint16_t *u16;
+	uint32_t *u32;
+	uint64_t *u64;
+
+	s = args->argv[1];
+	if ((p = strchr(s, '/'))  == NULL)
+		goto badfmt;
+	*p++ = '\0';
+
+	addr = (void *) strtoll(s, NULL, 0);
+	n = atoi(p);
+	if (n == 0)
+		n = 1;
+
+	len = strspn(p, "0123456789");
+	switch (p[len]) {
+	case 'x':
+		u16 = addr;
+		while (n-- > 0)
+			kprint("%x\n", (int) *u16++);
+		return 0;
+	case 'X':
+		u32 = addr;
+		while (n-- > 0)
+			kprint("%lx\n", (long) *u32++);
+		return 0;
+	case 'Y':
+		u64 = addr;
+		while (n-- > 0)
+			kprint("%x\n", (long long) *u64++);
+		return 0;
+	default:
+		goto badfmt;
+	}
+
+badfmt:
+	kprint(PREFIX "ERR x: bad format");
+	return 0;
+}
+
 static const struct cmd *
 parse_cmd(char *buf, struct args *args)
 {
@@ -311,6 +358,13 @@ static const struct cmd cmds[] = {
 		.helpmsg = "Display stat attribute: stat path",
 	},
 	{
+		.name = "x",
+		.eval = do_x,
+		.min = 2,
+		.max = 2,
+		.helpmsg = "Examine memory: x addr/fmt",
+	},
+	{
 		.name = NULL
 	}
 };