From b06d8ac39e0f36db4221367623f1908317daa60f Mon Sep 17 00:00:00 2001 From: "xypron.glpk@gmx.de" Date: Tue, 4 Jul 2017 23:15:21 +0200 Subject: [PATCH] bootefi: allow return without EFI_BOOT_SERVICES.Exit The Unified Extensible Firmware Interface Specification, version 2.7, defines in chapter 2.1.2 - UEFI Application that an EFI application may either directly return or call EFI_BOOT_SERVICES.Exit(). Unfortunately U-Boot makes the incorrect assumption that EFI_BOOT_SERVICES.Exit() is always called. So the following application leads to a memory exception on the aarch64 architecture when returning: EFI_STATUS efi_main( EFI_HANDLE handle, EFI_SYSTEM_TABlE systable) { return EFI_SUCCESS; } With this patch the entry point is stored in the image handle. The new wrapper function do_enter is used to call the EFI entry point. Signed-off-by: Heinrich Schuchardt Signed-off-by: Alexander Graf --- cmd/bootefi.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/cmd/bootefi.c b/cmd/bootefi.c index dcae253163..e6487dad21 100644 --- a/cmd/bootefi.c +++ b/cmd/bootefi.c @@ -147,15 +147,28 @@ static void *copy_fdt(void *fdt) return new_fdt; } +static ulong efi_do_enter(void *image_handle, + struct efi_system_table *st, + asmlinkage ulong (*entry)(void *image_handle, + struct efi_system_table *st)) +{ + efi_status_t ret = EFI_LOAD_ERROR; + + if (entry) + ret = entry(image_handle, st); + st->boottime->exit(image_handle, ret, 0, NULL); + return ret; +} + #ifdef CONFIG_ARM64 -static unsigned long efi_run_in_el2(ulong (*entry)(void *image_handle, - struct efi_system_table *st), void *image_handle, - struct efi_system_table *st) +static unsigned long efi_run_in_el2(asmlinkage ulong (*entry)( + void *image_handle, struct efi_system_table *st), + void *image_handle, struct efi_system_table *st) { /* Enable caches again */ dcache_enable(); - return entry(image_handle, st); + return efi_do_enter(image_handle, st, entry); } #endif @@ -260,7 +273,7 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt) } #endif - return entry(&loaded_image_info, &systab); + return efi_do_enter(&loaded_image_info, &systab, entry); }