sandbox: Avoid using malloc() for system state

This state is not accessible to the running U-Boot but at present it is
allocated in the emulated SDRAM. This doesn't seem very useful. Adjust
it to allocate from the OS instead.

The RAM buffer is currently not freed, but should be, so add that into
state_uninit(). Update the comment for os_free() to indicate that NULL is
a valid parameter value.

Note that the strdup() in spl_board_load_image() is changed as well, since
strdup() allocates memory in the RAM buffer.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/os.c

@@ -153,7 +153,7 @@ int os_read_file(const char *fname, void **bufp, int *sizep)
 		printf("Cannot seek to start of file '%s'\n", fname);
 		goto err;
 	}
-	*bufp = malloc(size);
+	*bufp = os_malloc(size);
 	if (!*bufp) {
 		printf("Not enough memory to read file '%s'\n", fname);
 		ret = -ENOMEM;
@@ -391,8 +391,8 @@ int os_parse_args(struct sandbox_state *state, int argc, char *argv[])
 	state->argv = argv;
 
 	/* dynamically construct the arguments to the system getopt_long */
-	short_opts = malloc(sizeof(*short_opts) * num_options * 2 + 1);
-	long_opts = malloc(sizeof(*long_opts) * (num_options + 1));
+	short_opts = os_malloc(sizeof(*short_opts) * num_options * 2 + 1);
+	long_opts = os_malloc(sizeof(*long_opts) * (num_options + 1));
 	if (!short_opts || !long_opts)
 		return 1;
 
@@ -471,7 +471,7 @@ void os_dirent_free(struct os_dirent_node *node)
 
 	while (node) {
 		next = node->next;
-		free(node);
+		os_free(node);
 		node = next;
 	}
 }
@@ -496,7 +496,7 @@ int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
 	/* Create a buffer upfront, with typically sufficient size */
 	dirlen = strlen(dirname) + 2;
 	len = dirlen + 256;
-	fname = malloc(len);
+	fname = os_malloc(len);
 	if (!fname) {
 		ret = -ENOMEM;
 		goto done;
@@ -509,7 +509,7 @@ int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
 			ret = errno;
 			break;
 		}
-		next = malloc(sizeof(*node) + strlen(entry->d_name) + 1);
+		next = os_malloc(sizeof(*node) + strlen(entry->d_name) + 1);
 		if (!next) {
 			os_dirent_free(head);
 			ret = -ENOMEM;
@@ -518,10 +518,10 @@ int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
 		if (dirlen + strlen(entry->d_name) > len) {
 			len = dirlen + strlen(entry->d_name);
 			old_fname = fname;
-			fname = realloc(fname, len);
+			fname = os_realloc(fname, len);
 			if (!fname) {
-				free(old_fname);
-				free(next);
+				os_free(old_fname);
+				os_free(next);
 				os_dirent_free(head);
 				ret = -ENOMEM;
 				goto done;
@@ -555,7 +555,7 @@ int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
 
 done:
 	closedir(dir);
-	free(fname);
+	os_free(fname);
 	return ret;
 }
 
@@ -672,7 +672,7 @@ static int add_args(char ***argvp, char *add_args[], int count)
 	for (argc = 0; (*argvp)[argc]; argc++)
 		;
 
-	argv = malloc((argc + count + 1) * sizeof(char *));
+	argv = os_malloc((argc + count + 1) * sizeof(char *));
 	if (!argv) {
 		printf("Out of memory for %d argv\n", count);
 		return -ENOMEM;
@@ -755,7 +755,7 @@ static int os_jump_to_file(const char *fname)
 		os_exit(2);
 
 	err = execv(fname, argv);
-	free(argv);
+	os_free(argv);
 	if (err) {
 		perror("Unable to run image");
 		printf("Image filename '%s'\n", fname);

arch/sandbox/cpu/spl.c

@@ -43,10 +43,14 @@ static int spl_board_load_image(struct spl_image_info *spl_image,
 		return ret;
 	}
 
-	/* Set up spl_image to boot from jump_to_image_no_args() */
-	spl_image->arg = strdup(fname);
+	/*
+	 * Set up spl_image to boot from jump_to_image_no_args(). Allocate this
+	 * outsdide the RAM buffer (i.e. don't use strdup()).
+	 */
+	spl_image->arg = os_malloc(strlen(fname) + 1);
 	if (!spl_image->arg)
-		return log_msg_ret("Setup exec filename", -ENOMEM);
+		return log_msg_ret("exec", -ENOMEM);
+	strcpy(spl_image->arg, fname);
 
 	return 0;
 }

arch/sandbox/cpu/start.c

@@ -88,7 +88,7 @@ int sandbox_early_getopt_check(void)
 
 	/* Sort the options */
 	size = sizeof(*sorted_opt) * num_options;
-	sorted_opt = malloc(size);
+	sorted_opt = os_malloc(size);
 	if (!sorted_opt) {
 		printf("No memory to sort options\n");
 		os_exit(1);
@@ -188,7 +188,7 @@ static int sandbox_cmdline_cb_default_fdt(struct sandbox_state *state,
 	int len;
 
 	len = strlen(state->argv[0]) + strlen(fmt) + 1;
-	fname = malloc(len);
+	fname = os_malloc(len);
 	if (!fname)
 		return -ENOMEM;
 	snprintf(fname, len, fmt, state->argv[0]);
@@ -208,7 +208,7 @@ static int sandbox_cmdline_cb_test_fdt(struct sandbox_state *state,
 	int len;
 
 	len = strlen(state->argv[0]) + strlen(fmt) + 1;
-	fname = malloc(len);
+	fname = os_malloc(len);
 	if (!fname)
 		return -ENOMEM;
 	strcpy(fname, state->argv[0]);
@@ -436,16 +436,18 @@ int main(int argc, char *argv[])
 {
 	struct sandbox_state *state;
 	gd_t data;
+	int size;
 	int ret;
 
 	/*
 	 * Copy argv[] so that we can pass the arguments in the original
 	 * sequence when resetting the sandbox.
 	 */
-	os_argv = calloc(argc + 1, sizeof(char *));
+	size = sizeof(char *) * (argc + 1);
+	os_argv = os_malloc(size);
 	if (!os_argv)
 		os_exit(1);
-	memcpy(os_argv, argv, sizeof(char *) * (argc + 1));
+	memcpy(os_argv, argv, size);
 
 	memset(&data, '\0', sizeof(data));
 	gd = &data;

arch/sandbox/cpu/state.c

@@ -29,17 +29,17 @@ static int state_ensure_space(int extra_size)
 		return 0;
 
 	size = used + extra_size;
-	buf = malloc(size);
+	buf = os_malloc(size);
 	if (!buf)
 		return -ENOMEM;
 
 	ret = fdt_open_into(blob, buf, size);
 	if (ret) {
-		free(buf);
+		os_free(buf);
 		return -EIO;
 	}
 
-	free(blob);
+	os_free(blob);
 	state->state_fdt = buf;
 	return 0;
 }
@@ -55,7 +55,7 @@ static int state_read_file(struct sandbox_state *state, const char *fname)
 		printf("Cannot find sandbox state file '%s'\n", fname);
 		return -ENOENT;
 	}
-	state->state_fdt = malloc(size);
+	state->state_fdt = os_malloc(size);
 	if (!state->state_fdt) {
 		puts("No memory to read sandbox state\n");
 		return -ENOMEM;
@@ -77,7 +77,7 @@ static int state_read_file(struct sandbox_state *state, const char *fname)
 err_read:
 	os_close(fd);
 err_open:
-	free(state->state_fdt);
+	os_free(state->state_fdt);
 	state->state_fdt = NULL;
 
 	return ret;
@@ -244,7 +244,7 @@ int sandbox_write_state(struct sandbox_state *state, const char *fname)
 	/* Create a state FDT if we don't have one */
 	if (!state->state_fdt) {
 		size = 0x4000;
-		state->state_fdt = malloc(size);
+		state->state_fdt = os_malloc(size);
 		if (!state->state_fdt) {
 			puts("No memory to create FDT\n");
 			return -ENOMEM;
@@ -302,7 +302,7 @@ int sandbox_write_state(struct sandbox_state *state, const char *fname)
 err_write:
 	os_close(fd);
 err_create:
-	free(state->state_fdt);
+	os_free(state->state_fdt);
 
 	return ret;
 }
@@ -419,8 +419,8 @@ int state_uninit(void)
 	if (state->jumped_fname)
 		os_unlink(state->jumped_fname);
 
-	if (state->state_fdt)
-		free(state->state_fdt);
+	os_free(state->state_fdt);
+	os_free(state->ram_buf);
 	memset(state, '\0', sizeof(*state));
 
 	return 0;

include/os.h

@@ -123,7 +123,8 @@ void *os_malloc(size_t length);
  *
  * This returns the memory to the OS.
  *
- * @ptr:	Pointer to memory block to free
+ * @ptr:	Pointer to memory block to free. If this is NULL then this
+ *		function does nothing
  */
 void os_free(void *ptr);