common: Convert the U-Boot commands to LG-arrays

This patch converts the old method of creating a list of command
onto the new LG-arrays code. The old u_boot_cmd section is converted
to new u_boot_list_cmd subsection and LG-array macros used as needed.

Minor adjustments had to be made to the common code to work with the
LG-array macros, mostly the fixup_cmdtable() calls are now passed the
ll_entry_start and ll_entry_count instead of linker-generated symbols.

The command.c had to be adjusted as well so it would use the newly
introduced LG-array API instead of directly using linker-generated
symbols.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>

arch/arm/imx-common/cmd_bmode.c

@@ -24,6 +24,7 @@
 #include <asm/io.h>
 #include <asm/imx-common/boot_mode.h>
 #include <malloc.h>
+#include <command.h>
 
 static const struct boot_mode *modes[2];
 
@@ -103,9 +104,11 @@ void add_board_boot_modes(const struct boot_mode *p)
 	int size;
 	char *dest;
 
-	if (__u_boot_cmd_bmode.usage) {
-		free(__u_boot_cmd_bmode.usage);
-		__u_boot_cmd_bmode.usage = NULL;
+	cmd_tbl_t *entry = ll_entry_get(cmd_tbl_t, bmode, cmd);
+
+	if (entry->usage) {
+		free(entry->usage);
+		entry->usage = NULL;
 	}
 
 	modes[0] = p;
@@ -114,6 +117,6 @@ void add_board_boot_modes(const struct boot_mode *p)
 	dest = malloc(size);
 	if (dest) {
 		create_usage(dest);
-		__u_boot_cmd_bmode.usage = dest;
+		entry->usage = dest;
 	}
 }

arch/avr32/lib/board.c

@@ -272,8 +272,8 @@ void board_init_r(gd_t *new_gd, ulong dest_addr)
 	/*
 	 * We have to relocate the command table manually
 	 */
-	fixup_cmdtable(&__u_boot_cmd_start,
-		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
+	fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
+			ll_entry_count(cmd_tbl_t, cmd));
 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 
 	/* there are some other pointer constants we must deal with */

arch/m68k/lib/board.c

@@ -416,8 +416,8 @@ void board_init_r (gd_t *id, ulong dest_addr)
 	/*
 	 * We have to relocate the command table manually
 	 */
-	fixup_cmdtable(&__u_boot_cmd_start,
-		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
+	fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
+			ll_entry_count(cmd_tbl_t, cmd));
 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 
 	/* there are some other pointer constants we must deal with */

arch/mips/lib/board.c

@@ -266,8 +266,8 @@ void board_init_r(gd_t *id, ulong dest_addr)
 	/*
 	 * We have to relocate the command table manually
 	 */
-	fixup_cmdtable(&__u_boot_cmd_start,
-		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
+	fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
+			ll_entry_count(cmd_tbl_t, cmd));
 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 
 	/* there are some other pointer constants we must deal with */

arch/nds32/lib/board.c

@@ -320,8 +320,8 @@ void board_init_r(gd_t *id, ulong dest_addr)
 	/*
 	 * We have to relocate the command table manually
 	 */
-	fixup_cmdtable(&__u_boot_cmd_start,
-		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
+	fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
+			ll_entry_count(cmd_tbl_t, cmd));
 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 
 	serial_initialize();

arch/sparc/lib/board.c

@@ -246,8 +246,8 @@ void board_init_f(ulong bootflag)
 	/*
 	 * We have to relocate the command table manually
 	 */
-	fixup_cmdtable(&__u_boot_cmd_start,
-		(ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start));
+	fixup_cmdtable(ll_entry_start(cmd_tbl_t, cmd),
+			ll_entry_count(cmd_tbl_t, cmd));
 #endif /* defined(CONFIG_NEEDS_MANUAL_RELOC) */
 
 #if defined(CONFIG_CMD_AMBAPP) && defined(CONFIG_SYS_AMBAPP_PRINT_ON_STARTUP)

common/cmd_help.c

@@ -26,9 +26,9 @@
 
 int do_help(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 {
-	return _do_help(&__u_boot_cmd_start,
-			&__u_boot_cmd_end - &__u_boot_cmd_start,
-			cmdtp, flag, argc, argv);
+	cmd_tbl_t *start = ll_entry_start(cmd_tbl_t, cmd);
+	const int len = ll_entry_count(cmd_tbl_t, cmd);
+	return _do_help(start, len, cmdtp, flag, argc, argv);
 }
 
 U_BOOT_CMD(
@@ -41,7 +41,7 @@ U_BOOT_CMD(
 );
 
 /* This does not use the U_BOOT_CMD macro as ? can't be used in symbol names */
-cmd_tbl_t __u_boot_cmd_question_mark Struct_Section = {
+ll_entry_declare(cmd_tbl_t, question_mark, cmd, cmd) = {
 	"?",	CONFIG_SYS_MAXARGS,	1,	do_help,
 	"alias for 'help'",
 #ifdef  CONFIG_SYS_LONGHELP

common/command.c

@@ -137,8 +137,9 @@ cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len)
 
 cmd_tbl_t *find_cmd (const char *cmd)
 {
-	int len = &__u_boot_cmd_end - &__u_boot_cmd_start;
-	return find_cmd_tbl(cmd, &__u_boot_cmd_start, len);
+	cmd_tbl_t *start = ll_entry_start(cmd_tbl_t, cmd);
+	const int len = ll_entry_count(cmd_tbl_t, cmd);
+	return find_cmd_tbl(cmd, start, len);
 }
 
 int cmd_usage(const cmd_tbl_t *cmdtp)
@@ -181,7 +182,9 @@ int var_complete(int argc, char * const argv[], char last_char, int maxv, char *
 
 static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
 {
-	cmd_tbl_t *cmdtp;
+	cmd_tbl_t *cmdtp = ll_entry_start(cmd_tbl_t, cmd);
+	const int count = ll_entry_count(cmd_tbl_t, cmd);
+	const cmd_tbl_t *cmdend = cmdtp + count;
 	const char *p;
 	int len, clen;
 	int n_found = 0;
@@ -195,12 +198,12 @@ static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv
 
 	if (argc == 0) {
 		/* output full list of commands */
-		for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
+		for (; cmdtp != cmdend; cmdtp++) {
 			if (n_found >= maxv - 2) {
-				cmdv[n_found++] = "...";
+				cmdv[n_found] = "...";
 				break;
 			}
-			cmdv[n_found++] = cmdtp->name;
+			cmdv[n_found] = cmdtp->name;
 		}
 		cmdv[n_found] = NULL;
 		return n_found;
@@ -228,7 +231,7 @@ static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv
 		len = p - cmd;
 
 	/* return the partial matches */
-	for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
+	for (; cmdtp != cmdend; cmdtp++) {
 
 		clen = strlen(cmdtp->name);
 		if (clen < len)

doc/README.commands

@@ -15,12 +15,12 @@ help:	 Long description. This is a string
 
 **** Behind the scene ******
 
-The structure created is named with a special prefix (__u_boot_cmd_)
+The structure created is named with a special prefix (__u_boot_list_cmd_)
 and placed by the linker in a special section.
 
 This makes it possible for the final link to extract all commands
 compiled into any object code and construct a static array so the
-command can be found in an array starting at __u_boot_cmd_start.
+command can be found in an array starting at _u_boot_list_cmd__start.
 
 To ensure that the linker does not discard these symbols when linking
 full U-Boot we generate a list of all the commands we have built (based
@@ -33,6 +33,6 @@ If a new board is defined do not forget to define the command section
 by writing in u-boot.lds ($(TOPDIR)/board/boardname/u-boot.lds) these
 3 lines:
 
-	__u_boot_cmd_start = .;
-	.u_boot_cmd : { *(.u_boot_cmd) }
-	__u_boot_cmd_end = .;
+	.u_boot_list : {
+	#include "u-boot.lst";
+	}

include/command.h

@@ -28,6 +28,7 @@
 #define __COMMAND_H
 
 #include <config.h>
+#include <linker_lists.h>
 
 #ifndef NULL
 #define NULL	0
@@ -153,9 +154,6 @@ int cmd_process(int flag, int argc, char * const argv[],
 #define CMD_FLAG_REPEAT		0x0001	/* repeat last command		*/
 #define CMD_FLAG_BOOTD		0x0002	/* command is from bootd	*/
 
-#define Struct_Section  __attribute__((unused, section(".u_boot_cmd"), \
-		aligned(4)))
-
 #ifdef CONFIG_AUTO_COMPLETE
 # define _CMD_COMPLETE(x) x,
 #else
@@ -167,18 +165,22 @@ int cmd_process(int flag, int argc, char * const argv[],
 # define _CMD_HELP(x)
 #endif
 
-#define U_BOOT_CMD_MKENT_COMPLETE(name,maxargs,rep,cmd,usage,help,comp) \
-	{#name, maxargs, rep, cmd, usage, _CMD_HELP(help) _CMD_COMPLETE(comp)}
+#define U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd,		\
+				_usage, _help, _comp)			\
+		{ #_name, _maxargs, _rep, _cmd, _usage,			\
+			_CMD_HELP(_help) _CMD_COMPLETE(_comp) }
 
-#define U_BOOT_CMD_MKENT(name,maxargs,rep,cmd,usage,help) \
-	U_BOOT_CMD_MKENT_COMPLETE(name,maxargs,rep,cmd,usage,help,NULL)
+#define U_BOOT_CMD_MKENT(_name, _maxargs, _rep, _cmd, _usage, _help)	\
+	U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd,		\
+					_usage, _help, NULL)
 
-#define U_BOOT_CMD_COMPLETE(name,maxargs,rep,cmd,usage,help,comp) \
-	cmd_tbl_t __u_boot_cmd_##name Struct_Section = \
-		U_BOOT_CMD_MKENT_COMPLETE(name,maxargs,rep,cmd,usage,help,comp)
+#define U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, _comp) \
+	ll_entry_declare(cmd_tbl_t, _name, cmd, cmd) =			\
+		U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd,	\
+						_usage, _help, _comp);
 
-#define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \
-	U_BOOT_CMD_COMPLETE(name,maxargs,rep,cmd,usage,help,NULL)
+#define U_BOOT_CMD(_name, _maxargs, _rep, _cmd, _usage, _help)		\
+	U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, NULL)
 
 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 void fixup_cmdtable(cmd_tbl_t *cmdtp, int size);