[PATCH v2] cmd: bootm: add ELF file support

[Maxim Moskalets]

From: Maxim Moskalets <maximmosk4 at gmail.com>

Some operating systems (e.g. seL4) and embedded applications are ELF
images. It is convenient to use FIT-images to implement trusted boot.
Added "elf" image type for booting using bootm command.

Signed-off-by: Maxim Moskalets <maximmosk4 at gmail.com>
---
 boot/bootm_os.c  | 24 ++++++++++++++++++++++++
 boot/image-fit.c |  3 ++-
 boot/image.c     |  3 +++
 include/image.h  |  1 +
 4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/boot/bootm_os.c b/boot/bootm_os.c
index ccde72d22c..1c92b8149c 100644
--- a/boot/bootm_os.c
+++ b/boot/bootm_os.c
@@ -395,6 +395,27 @@ static int do_bootm_qnxelf(int flag, struct bootm_info *bmi)
 }
 #endif
 
+#if defined(CONFIG_CMD_ELF)
+static int do_bootm_elf(int flag, struct bootm_info *bmi)
+{
+	struct bootm_headers *images = bmi->images;
+	char *local_args[2] = {NULL};
+	char str[19] = ""; /* "0x" + 16 digits + "\0" */
+
+	if (flag != BOOTM_STATE_OS_GO)
+		return 0;
+
+	snprintf(str, sizeof str, "0x%lx", images->ep); /* write entry-point into string */
+	str[18] = '\0';
+	local_args[0] = bmi->argv[0];
+	local_args[1] = str;	/* and provide it via the arguments */
+
+	do_bootelf(NULL, 0, 2, local_args);
+
+	return 1;
+}
+#endif
+
 #ifdef CONFIG_INTEGRITY
 static int do_bootm_integrity(int flag, struct bootm_info *bmi)
 {
@@ -536,6 +557,9 @@ static boot_os_fn *boot_os[] = {
 #ifdef CONFIG_BOOTM_EFI
 	[IH_OS_EFI] = do_bootm_efi,
 #endif
+#if defined(CONFIG_CMD_ELF)
+	[IH_OS_ELF] = do_bootm_elf,
+#endif
 };
 
 /* Allow for arch specific config before we boot */
diff --git a/boot/image-fit.c b/boot/image-fit.c
index 89e377563c..0419bef6d2 100644
--- a/boot/image-fit.c
+++ b/boot/image-fit.c
@@ -2180,7 +2180,8 @@ int fit_image_load(struct bootm_headers *images, ulong addr,
 		fit_image_check_os(fit, noffset, IH_OS_TEE) ||
 		fit_image_check_os(fit, noffset, IH_OS_OPENRTOS) ||
 		fit_image_check_os(fit, noffset, IH_OS_EFI) ||
-		fit_image_check_os(fit, noffset, IH_OS_VXWORKS);
+		fit_image_check_os(fit, noffset, IH_OS_VXWORKS) ||
+		fit_image_check_os(fit, noffset, IH_OS_ELF);
 
 	/*
 	 * If either of the checks fail, we should report an error, but
diff --git a/boot/image.c b/boot/image.c
index 073931cd7a..5b88d6808c 100644
--- a/boot/image.c
+++ b/boot/image.c
@@ -134,6 +134,9 @@ static const table_entry_t uimage_os[] = {
 #endif
 	{	IH_OS_OPENSBI,	"opensbi",	"RISC-V OpenSBI",	},
 	{	IH_OS_EFI,	"efi",		"EFI Firmware" },
+#ifdef CONFIG_CMD_ELF
+	{	IH_OS_ELF,	"elf",		"ELF Image" },
+#endif
 
 	{	-1,		"",		"",			},
 };
diff --git a/include/image.h b/include/image.h
index 21de70f0c9..9a40bca22c 100644
--- a/include/image.h
+++ b/include/image.h
@@ -100,6 +100,7 @@ enum {
 	IH_OS_TEE,			/* Trusted Execution Environment */
 	IH_OS_OPENSBI,			/* RISC-V OpenSBI */
 	IH_OS_EFI,			/* EFI Firmware (e.g. GRUB2) */
+	IH_OS_ELF,			/* ELF Image (e.g. seL4) */
 
 	IH_OS_COUNT,
 };
-- 
2.39.2