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efi_loader: refactor efi_setup_loaded_image()

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Create the handle of loaded images and the EFI_LOADED_IMAGE_PROTOCOL
inside efi_setup_loaded_image(). Do not use local variables.

Currently we expect the loaded image handle to point to the loaded image
protocol. Additionally we have appended private fields to the protocol.

With the patch the handle points to a loaded image object and the private
fields are added here. This matches how we handle the net and the gop
object.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
lime2-spi
Heinrich Schuchardt 6 years ago committed by Alexander Graf
parent a47c1b5b87
commit c982874e93
5 changed files with 117 additions and 100 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 67
      cmd/bootefi.c
  2. 8
      include/efi_api.h
  3. 27
      include/efi_loader.h
  4. 92
      lib/efi_loader/efi_boottime.c
  5. 23
      lib/efi_loader/efi_image_loader.c

67
cmd/bootefi.c
Unescape View File

@ -320,19 +320,26 @@ static efi_status_t efi_install_fdt(ulong fdt_addr)
return ret; return ret;
} }
/* /**
* Load an EFI payload into a newly allocated piece of memory, register all * do_bootefi_exec() - execute EFI binary
* EFI objects it would want to access and jump to it. *
* @efi: address of the binary
* @device_path: path of the device from which the binary was loaded
* @image_path: device path of the binary
* Return: status code
*
* Load the EFI binary into a newly assigned memory unwinding the relocation
* information, install the loaded image protocol, and call the binary.
*/ */
static efi_status_t do_bootefi_exec(void *efi, static efi_status_t do_bootefi_exec(void *efi,
struct efi_device_path *device_path, struct efi_device_path *device_path,
struct efi_device_path *image_path) struct efi_device_path *image_path)
{ {
struct efi_loaded_image loaded_image_info = {};
struct efi_object loaded_image_info_obj = {};
efi_handle_t mem_handle = NULL; efi_handle_t mem_handle = NULL;
struct efi_device_path *memdp = NULL; struct efi_device_path *memdp = NULL;
efi_status_t ret; efi_status_t ret;
struct efi_loaded_image_obj *image_handle = NULL;
struct efi_loaded_image *loaded_image_info = NULL;
EFIAPI efi_status_t (*entry)(efi_handle_t image_handle, EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
struct efi_system_table *st); struct efi_system_table *st);
@ -362,8 +369,10 @@ static efi_status_t do_bootefi_exec(void *efi,
assert(device_path && image_path); assert(device_path && image_path);
} }
efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj, ret = efi_setup_loaded_image(device_path, image_path, &image_handle,
device_path, image_path); &loaded_image_info);
if (ret != EFI_SUCCESS)
goto exit;
/* /*
* gd lives in a fixed register which may get clobbered while we execute * gd lives in a fixed register which may get clobbered while we execute
@ -372,9 +381,9 @@ static efi_status_t do_bootefi_exec(void *efi,
efi_save_gd(); efi_save_gd();
/* Transfer environment variable bootargs as load options */ /* Transfer environment variable bootargs as load options */
set_load_options(&loaded_image_info, "bootargs"); set_load_options(loaded_image_info, "bootargs");
/* Load the EFI payload */ /* Load the EFI payload */
entry = efi_load_pe(efi, &loaded_image_info); entry = efi_load_pe(image_handle, efi, loaded_image_info);
if (!entry) { if (!entry) {
ret = EFI_LOAD_ERROR; ret = EFI_LOAD_ERROR;
goto exit; goto exit;
@ -382,10 +391,10 @@ static efi_status_t do_bootefi_exec(void *efi,
if (memdp) { if (memdp) {
struct efi_device_path_memory *mdp = (void *)memdp; struct efi_device_path_memory *mdp = (void *)memdp;
mdp->memory_type = loaded_image_info.image_code_type; mdp->memory_type = loaded_image_info->image_code_type;
mdp->start_address = (uintptr_t)loaded_image_info.image_base; mdp->start_address = (uintptr_t)loaded_image_info->image_base;
mdp->end_address = mdp->start_address + mdp->end_address = mdp->start_address +
loaded_image_info.image_size; loaded_image_info->image_size;
} }
/* we don't support much: */ /* we don't support much: */
@ -395,8 +404,8 @@ static efi_status_t do_bootefi_exec(void *efi,
/* Call our payload! */ /* Call our payload! */
debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
if (setjmp(&loaded_image_info.exit_jmp)) { if (setjmp(&image_handle->exit_jmp)) {
ret = loaded_image_info.exit_status; ret = image_handle->exit_status;
goto exit; goto exit;
} }
@ -408,7 +417,7 @@ static efi_status_t do_bootefi_exec(void *efi,
/* Move into EL2 and keep running there */ /* Move into EL2 and keep running there */
armv8_switch_to_el2((ulong)entry, armv8_switch_to_el2((ulong)entry,
(ulong)loaded_image_info_obj.handle, (ulong)image_handle,
(ulong)&systab, 0, (ulong)efi_run_in_el2, (ulong)&systab, 0, (ulong)efi_run_in_el2,
ES_TO_AARCH64); ES_TO_AARCH64);
@ -425,7 +434,7 @@ static efi_status_t do_bootefi_exec(void *efi,
secure_ram_addr(_do_nonsec_entry)( secure_ram_addr(_do_nonsec_entry)(
efi_run_in_hyp, efi_run_in_hyp,
(uintptr_t)entry, (uintptr_t)entry,
(uintptr_t)loaded_image_info_obj.handle, (uintptr_t)image_handle,
(uintptr_t)&systab); (uintptr_t)&systab);
/* Should never reach here, efi exits with longjmp */ /* Should never reach here, efi exits with longjmp */
@ -433,11 +442,12 @@ static efi_status_t do_bootefi_exec(void *efi,
} }
#endif #endif
ret = efi_do_enter(loaded_image_info_obj.handle, &systab, entry); ret = efi_do_enter(image_handle, &systab, entry);
exit: exit:
/* image has returned, loaded-image obj goes *poof*: */ /* image has returned, loaded-image obj goes *poof*: */
list_del(&loaded_image_info_obj.link); if (image_handle)
efi_delete_handle(&image_handle->parent);
if (mem_handle) if (mem_handle)
efi_delete_handle(mem_handle); efi_delete_handle(mem_handle);
@ -522,8 +532,8 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#endif #endif
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
if (!strcmp(argv[1], "selftest")) { if (!strcmp(argv[1], "selftest")) {
struct efi_loaded_image loaded_image_info = {}; struct efi_loaded_image_obj *image_handle;
struct efi_object loaded_image_info_obj = {}; struct efi_loaded_image *loaded_image_info;
/* Construct a dummy device path. */ /* Construct a dummy device path. */
bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
@ -531,9 +541,12 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
(uintptr_t)&efi_selftest); (uintptr_t)&efi_selftest);
bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest"); bootefi_image_path = efi_dp_from_file(NULL, 0, "\\selftest");
efi_setup_loaded_image(&loaded_image_info, r = efi_setup_loaded_image(bootefi_device_path,
&loaded_image_info_obj, bootefi_image_path, &image_handle,
bootefi_device_path, bootefi_image_path); &loaded_image_info);
if (r != EFI_SUCCESS)
return CMD_RET_FAILURE;
/* /*
* gd lives in a fixed register which may get clobbered while we * gd lives in a fixed register which may get clobbered while we
* execute the payload. So save it here and restore it on every * execute the payload. So save it here and restore it on every
@ -541,12 +554,12 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
*/ */
efi_save_gd(); efi_save_gd();
/* Transfer environment variable efi_selftest as load options */ /* Transfer environment variable efi_selftest as load options */
set_load_options(&loaded_image_info, "efi_selftest"); set_load_options(loaded_image_info, "efi_selftest");
/* Execute the test */ /* Execute the test */
r = efi_selftest(loaded_image_info_obj.handle, &systab); r = efi_selftest(image_handle, &systab);
efi_restore_gd(); efi_restore_gd();
free(loaded_image_info.load_options); free(loaded_image_info->load_options);
list_del(&loaded_image_info_obj.link); efi_delete_handle(&image_handle->parent);
return r != EFI_SUCCESS; return r != EFI_SUCCESS;
} else } else
#endif #endif

8
include/efi_api.h
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@ -339,14 +339,6 @@ struct efi_loaded_image {
unsigned int image_code_type; unsigned int image_code_type;
unsigned int image_data_type; unsigned int image_data_type;
unsigned long unload; unsigned long unload;
/* Below are efi loader private fields */
#ifdef CONFIG_EFI_LOADER
void *reloc_base;
aligned_u64 reloc_size;
efi_status_t exit_status;
struct jmp_buf_data exit_jmp;
#endif
}; };
#define DEVICE_PATH_GUID \ #define DEVICE_PATH_GUID \

27
include/efi_loader.h
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@ -184,6 +184,20 @@ struct efi_object {
}; };
/** /**
* struct efi_loaded_image_obj - handle of a loaded image
*/
struct efi_loaded_image_obj {
/* Generic EFI object parent class data */
struct efi_object parent;
void *reloc_base;
aligned_u64 reloc_size;
efi_status_t exit_status;
struct jmp_buf_data exit_jmp;
EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
struct efi_system_table *st);
};
/**
* struct efi_event * struct efi_event
* *
* @link: Link to list of all events * @link: Link to list of all events
@ -264,7 +278,8 @@ efi_status_t efi_set_watchdog(unsigned long timeout);
/* Called from places to check whether a timer expired */ /* Called from places to check whether a timer expired */
void efi_timer_check(void); void efi_timer_check(void);
/* PE loader implementation */ /* PE loader implementation */
void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info); void *efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
struct efi_loaded_image *loaded_image_info);
/* Called once to store the pristine gd pointer */ /* Called once to store the pristine gd pointer */
void efi_save_gd(void); void efi_save_gd(void);
/* Special case handler for error/abort that just tries to dtrt to get /* Special case handler for error/abort that just tries to dtrt to get
@ -345,14 +360,12 @@ int efi_memory_init(void);
/* Adds new or overrides configuration table entry to the system table */ /* Adds new or overrides configuration table entry to the system table */
efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table); efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
/* Sets up a loaded image */ /* Sets up a loaded image */
efi_status_t efi_setup_loaded_image( efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
struct efi_loaded_image *info, struct efi_object *obj, struct efi_device_path *file_path,
struct efi_device_path *device_path, struct efi_loaded_image_obj **handle_ptr,
struct efi_device_path *file_path); struct efi_loaded_image **info_ptr);
efi_status_t efi_load_image_from_path(struct efi_device_path *file_path, efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
void **buffer); void **buffer);
/* Print information about a loaded image */
efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc);
/* Print information about all loaded images */ /* Print information about all loaded images */
void efi_print_image_infos(void *pc); void efi_print_image_infos(void *pc);

92
lib/efi_loader/efi_boottime.c
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@ -1470,17 +1470,31 @@ static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
* *
* Return: status code * Return: status code
*/ */
efi_status_t efi_setup_loaded_image( efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
struct efi_loaded_image *info, struct efi_object *obj, struct efi_device_path *file_path,
struct efi_device_path *device_path, struct efi_loaded_image_obj **handle_ptr,
struct efi_device_path *file_path) struct efi_loaded_image **info_ptr)
{ {
efi_status_t ret; efi_status_t ret;
struct efi_loaded_image *info;
struct efi_loaded_image_obj *obj;
info = calloc(1, sizeof(*info));
if (!info)
return EFI_OUT_OF_RESOURCES;
obj = calloc(1, sizeof(*obj));
if (!obj) {
free(info);
return EFI_OUT_OF_RESOURCES;
}
/* Add internal object to object list */ /* Add internal object to object list */
efi_add_handle(obj); efi_add_handle(&obj->parent);
/* efi_exit() assumes that the handle points to the info */
obj->handle = info; if (info_ptr)
*info_ptr = info;
if (handle_ptr)
*handle_ptr = obj;
info->revision = EFI_LOADED_IMAGE_PROTOCOL_REVISION; info->revision = EFI_LOADED_IMAGE_PROTOCOL_REVISION;
info->file_path = file_path; info->file_path = file_path;
@ -1492,8 +1506,8 @@ efi_status_t efi_setup_loaded_image(
* When asking for the device path interface, return * When asking for the device path interface, return
* bootefi_device_path * bootefi_device_path
*/ */
ret = efi_add_protocol(obj->handle, &efi_guid_device_path, ret = efi_add_protocol(obj->parent.handle,
device_path); &efi_guid_device_path, device_path);
if (ret != EFI_SUCCESS) if (ret != EFI_SUCCESS)
goto failure; goto failure;
} }
@ -1502,7 +1516,8 @@ efi_status_t efi_setup_loaded_image(
* When asking for the loaded_image interface, just * When asking for the loaded_image interface, just
* return handle which points to loaded_image_info * return handle which points to loaded_image_info
*/ */
ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info); ret = efi_add_protocol(obj->parent.handle,
&efi_guid_loaded_image, info);
if (ret != EFI_SUCCESS) if (ret != EFI_SUCCESS)
goto failure; goto failure;
@ -1585,7 +1600,8 @@ static efi_status_t EFIAPI efi_load_image(bool boot_policy,
efi_handle_t *image_handle) efi_handle_t *image_handle)
{ {
struct efi_loaded_image *info; struct efi_loaded_image *info;
struct efi_object *obj; struct efi_loaded_image_obj **image_obj =
(struct efi_loaded_image_obj **)image_handle;
efi_status_t ret; efi_status_t ret;
EFI_ENTRY("%d, %p, %pD, %p, %zd, %p", boot_policy, parent_image, EFI_ENTRY("%d, %p, %pD, %p, %zd, %p", boot_policy, parent_image,
@ -1601,18 +1617,6 @@ static efi_status_t EFIAPI efi_load_image(bool boot_policy,
goto error; goto error;
} }
info = calloc(1, sizeof(*info));
if (!info) {
ret = EFI_OUT_OF_RESOURCES;
goto error;
}
obj = calloc(1, sizeof(*obj));
if (!obj) {
free(info);
ret = EFI_OUT_OF_RESOURCES;
goto error;
}
if (!source_buffer) { if (!source_buffer) {
struct efi_device_path *dp, *fp; struct efi_device_path *dp, *fp;
@ -1624,29 +1628,29 @@ static efi_status_t EFIAPI efi_load_image(bool boot_policy,
* file parts: * file parts:
*/ */
efi_dp_split_file_path(file_path, &dp, &fp); efi_dp_split_file_path(file_path, &dp, &fp);
ret = efi_setup_loaded_image(info, obj, dp, fp); ret = efi_setup_loaded_image(dp, fp, image_obj, &info);
if (ret != EFI_SUCCESS) if (ret != EFI_SUCCESS)
goto failure; goto failure;
} else { } else {
/* In this case, file_path is the "device" path, i.e. /* In this case, file_path is the "device" path, i.e.
* something like a HARDWARE_DEVICE:MEMORY_MAPPED * something like a HARDWARE_DEVICE:MEMORY_MAPPED
*/ */
ret = efi_setup_loaded_image(info, obj, file_path, NULL); ret = efi_setup_loaded_image(file_path, NULL, image_obj, &info);
if (ret != EFI_SUCCESS) if (ret != EFI_SUCCESS)
goto failure; goto error;
} }
info->reserved = efi_load_pe(source_buffer, info); (*image_obj)->entry = efi_load_pe(*image_obj, source_buffer, info);
if (!info->reserved) { if (!(*image_obj)->entry) {
ret = EFI_UNSUPPORTED; ret = EFI_UNSUPPORTED;
goto failure; goto failure;
} }
info->system_table = &systab; info->system_table = &systab;
info->parent_handle = parent_image; info->parent_handle = parent_image;
*image_handle = obj->handle;
return EFI_EXIT(EFI_SUCCESS); return EFI_EXIT(EFI_SUCCESS);
failure: failure:
efi_delete_handle(*image_handle);
*image_handle = NULL;
free(info); free(info);
efi_delete_handle(obj);
error: error:
return EFI_EXIT(ret); return EFI_EXIT(ret);
} }
@ -1668,16 +1672,14 @@ static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
unsigned long *exit_data_size, unsigned long *exit_data_size,
s16 **exit_data) s16 **exit_data)
{ {
EFIAPI efi_status_t (*entry)(efi_handle_t image_handle, struct efi_loaded_image_obj *image_obj =
struct efi_system_table *st); (struct efi_loaded_image_obj *)image_handle;
struct efi_loaded_image *info = image_handle;
efi_status_t ret; efi_status_t ret;
EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data); EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
entry = info->reserved;
/* call the image! */ /* call the image! */
if (setjmp(&info->exit_jmp)) { if (setjmp(&image_obj->exit_jmp)) {
/* /*
* We called the entry point of the child image with EFI_CALL * We called the entry point of the child image with EFI_CALL
* in the lines below. The child image called the Exit() boot * in the lines below. The child image called the Exit() boot
@ -1700,12 +1702,12 @@ static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
assert(__efi_entry_check()); assert(__efi_entry_check());
debug("%sEFI: %lu returned by started image\n", debug("%sEFI: %lu returned by started image\n",
__efi_nesting_dec(), __efi_nesting_dec(),
(unsigned long)((uintptr_t)info->exit_status & (unsigned long)((uintptr_t)image_obj->exit_status &
~EFI_ERROR_MASK)); ~EFI_ERROR_MASK));
return EFI_EXIT(info->exit_status); return EFI_EXIT(image_obj->exit_status);
} }
ret = EFI_CALL(entry(image_handle, &systab)); ret = EFI_CALL(image_obj->entry(image_handle, &systab));
/* /*
* Usually UEFI applications call Exit() instead of returning. * Usually UEFI applications call Exit() instead of returning.
@ -1736,17 +1738,11 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
int16_t *exit_data) int16_t *exit_data)
{ {
/* /*
* We require that the handle points to the original loaded
* image protocol interface.
*
* For getting the longjmp address this is safer than locating
* the protocol because the protocol may have been reinstalled
* pointing to another memory location.
*
* TODO: We should call the unload procedure of the loaded * TODO: We should call the unload procedure of the loaded
* image protocol. * image protocol.
*/ */
struct efi_loaded_image *loaded_image_info = (void *)image_handle; struct efi_loaded_image_obj *image_obj =
(struct efi_loaded_image_obj *)image_handle;
EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status, EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
exit_data_size, exit_data); exit_data_size, exit_data);
@ -1760,8 +1756,8 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
*/ */
efi_restore_gd(); efi_restore_gd();
loaded_image_info->exit_status = exit_status; image_obj->exit_status = exit_status;
longjmp(&loaded_image_info->exit_jmp, 1); longjmp(&image_obj->exit_jmp, 1);
panic("EFI application exited"); panic("EFI application exited");
} }

23
lib/efi_loader/efi_image_loader.c
Unescape View File

@ -48,20 +48,21 @@ static int machines[] = {
* If the program counter is located within the image the offset to the base * If the program counter is located within the image the offset to the base
* address is shown. * address is shown.
* *
* @obj: EFI object
* @image: loaded image * @image: loaded image
* @pc: program counter (use NULL to suppress offset output) * @pc: program counter (use NULL to suppress offset output)
* @return: status code * @return: status code
*/ */
efi_status_t efi_print_image_info(struct efi_loaded_image *image, void *pc) static efi_status_t efi_print_image_info(struct efi_loaded_image_obj *obj,
struct efi_loaded_image *image,
void *pc)
{ {
if (!image)
return EFI_INVALID_PARAMETER;
printf("UEFI image"); printf("UEFI image");
printf(" [0x%p:0x%p]", printf(" [0x%p:0x%p]",
image->reloc_base, image->reloc_base + image->reloc_size - 1); obj->reloc_base, obj->reloc_base + obj->reloc_size - 1);
if (pc && pc >= image->reloc_base && if (pc && pc >= obj->reloc_base &&
pc < image->reloc_base + image->reloc_size) pc < obj->reloc_base + obj->reloc_size)
printf(" pc=0x%zx", pc - image->reloc_base); printf(" pc=0x%zx", pc - obj->reloc_base);
if (image->file_path) if (image->file_path)
printf(" '%pD'", image->file_path); printf(" '%pD'", image->file_path);
printf("\n"); printf("\n");
@ -82,6 +83,7 @@ void efi_print_image_infos(void *pc)
list_for_each_entry(handler, &efiobj->protocols, link) { list_for_each_entry(handler, &efiobj->protocols, link) {
if (!guidcmp(handler->guid, &efi_guid_loaded_image)) { if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
efi_print_image_info( efi_print_image_info(
(struct efi_loaded_image_obj *)efiobj,
handler->protocol_interface, pc); handler->protocol_interface, pc);
} }
} }
@ -196,7 +198,8 @@ static void efi_set_code_and_data_type(
* piece of memory. On successful load it then returns the entry point for * piece of memory. On successful load it then returns the entry point for
* the binary. Otherwise NULL. * the binary. Otherwise NULL.
*/ */
void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info) void *efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
struct efi_loaded_image *loaded_image_info)
{ {
IMAGE_NT_HEADERS32 *nt; IMAGE_NT_HEADERS32 *nt;
IMAGE_DOS_HEADER *dos; IMAGE_DOS_HEADER *dos;
@ -314,8 +317,8 @@ void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
/* Populate the loaded image interface bits */ /* Populate the loaded image interface bits */
loaded_image_info->image_base = efi; loaded_image_info->image_base = efi;
loaded_image_info->image_size = image_size; loaded_image_info->image_size = image_size;
loaded_image_info->reloc_base = efi_reloc; handle->reloc_base = efi_reloc;
loaded_image_info->reloc_size = virt_size; handle->reloc_size = virt_size;
return entry; return entry;
} }

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