efi_selftest: use standalone UEFI program for exception
To fully demonstrate crash outputs for UEFI images provide a standalone UEFI application that tries to invoke an illegal opcode. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
parent
ce9ad0313c
commit
53c701720c
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@ -20,7 +20,6 @@ efi_selftest_crc32.o \
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efi_selftest_devicepath_util.o \
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efi_selftest_events.o \
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efi_selftest_event_groups.o \
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efi_selftest_exception.o \
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efi_selftest_exitbootservices.o \
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efi_selftest_gop.o \
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efi_selftest_loaded_image.o \
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@ -60,16 +59,23 @@ endif
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ifeq ($(CONFIG_SANDBOX)$(CONFIG_CPU_V7M),)
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obj-y += \
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efi_selftest_exception.o \
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efi_selftest_loadimage.o \
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efi_selftest_startimage_exit.o \
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efi_selftest_startimage_return.o
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targets += \
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efi_miniapp_file_image_exception.h \
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efi_miniapp_file_image_exit.h \
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efi_miniapp_file_image_return.h \
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efi_selftest_miniapp_exception.efi \
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efi_selftest_miniapp_exit.efi \
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efi_selftest_miniapp_return.efi
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$(obj)/efi_miniapp_file_image_exception.h: $(obj)/efi_selftest_miniapp_exception.efi
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$(obj)/../../tools/file2include $(obj)/efi_selftest_miniapp_exception.efi > \
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$(obj)/efi_miniapp_file_image_exception.h
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$(obj)/efi_miniapp_file_image_exit.h: $(obj)/efi_selftest_miniapp_exit.efi
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$(obj)/../../tools/file2include $(obj)/efi_selftest_miniapp_exit.efi > \
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$(obj)/efi_miniapp_file_image_exit.h
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@ -80,6 +86,8 @@ $(obj)/efi_miniapp_file_image_return.h: $(obj)/efi_selftest_miniapp_return.efi
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$(obj)/efi_selftest_loadimage.o: $(obj)/efi_miniapp_file_image_exit.h
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$(obj)/efi_selftest_exception.o: $(obj)/efi_miniapp_file_image_exception.h
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$(obj)/efi_selftest_startimage_exit.o: $(obj)/efi_miniapp_file_image_exit.h
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$(obj)/efi_selftest_startimage_return.o: $(obj)/efi_miniapp_file_image_return.h
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@ -2,42 +2,138 @@
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/*
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* efi_selftest_exception
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*
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* Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
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* Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* Test the handling of exceptions by trying to execute an undefined
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* instruction.
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* This test checks the handling of exceptions.
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*
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* The efi_selftest_miniapp_exception.efi application is loaded into memory
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* and started.
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*/
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#include <efi_selftest.h>
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/* Include containing the UEFI application */
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#include "efi_miniapp_file_image_exception.h"
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/**
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* undefined_instruction() - try to executed an undefined instruction
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/* Block size of compressed disk image */
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#define COMPRESSED_DISK_IMAGE_BLOCK_SIZE 8
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/* Binary logarithm of the block size */
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#define LB_BLOCK_SIZE 9
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/* File device path for LoadImage() */
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static struct {
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struct efi_device_path dp;
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u16 filename[8];
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struct efi_device_path end;
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} dp = {
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{
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DEVICE_PATH_TYPE_MEDIA_DEVICE,
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DEVICE_PATH_SUB_TYPE_FILE_PATH,
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sizeof(dp.dp) + sizeof(dp.filename),
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},
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L"bug.efi",
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{
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DEVICE_PATH_TYPE_END,
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DEVICE_PATH_SUB_TYPE_END,
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sizeof(dp.end),
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}
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};
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static efi_handle_t image_handle;
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static struct efi_boot_services *boottime;
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/* One 8 byte block of the compressed disk image */
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struct line {
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size_t addr;
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char *line;
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};
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/* Compressed file image */
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struct compressed_file_image {
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size_t length;
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struct line lines[];
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};
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static struct compressed_file_image img = EFI_ST_DISK_IMG;
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/* Decompressed file image */
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static u8 *image;
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/*
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* Decompress the disk image.
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*
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* @image decompressed disk image
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* @return status code
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*/
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static void undefined_instruction(void)
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static efi_status_t decompress(u8 **image)
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{
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#if defined(CONFIG_ARM)
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/*
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* 0xe7f...f. is undefined in ARM mode
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* 0xde.. is undefined in Thumb mode
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*/
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asm volatile (".word 0xe7f7defb\n");
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#elif defined(CONFIG_RISCV)
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asm volatile (".word 0xffffffff\n");
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#elif defined(CONFIG_X86)
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asm volatile (".word 0xffff\n");
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#endif
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u8 *buf;
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size_t i;
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size_t addr;
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size_t len;
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efi_status_t ret;
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ret = boottime->allocate_pool(EFI_LOADER_DATA, img.length,
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(void **)&buf);
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if (ret != EFI_SUCCESS) {
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efi_st_error("Out of memory\n");
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return ret;
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}
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boottime->set_mem(buf, img.length, 0);
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for (i = 0; ; ++i) {
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if (!img.lines[i].line)
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break;
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addr = img.lines[i].addr;
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len = COMPRESSED_DISK_IMAGE_BLOCK_SIZE;
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if (addr + len > img.length)
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len = img.length - addr;
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boottime->copy_mem(buf + addr, img.lines[i].line, len);
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}
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*image = buf;
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return ret;
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}
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/**
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* execute() - execute unit test
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/*
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* Setup unit test.
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*
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* Return: EFI_ST_SUCCESS for success
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* @handle: handle of the loaded image
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* @systable: system table
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* @return: EFI_ST_SUCCESS for success
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*/
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static int setup(const efi_handle_t handle,
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const struct efi_system_table *systable)
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{
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image_handle = handle;
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boottime = systable->boottime;
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/* Load the application image into memory */
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decompress(&image);
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return EFI_ST_SUCCESS;
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}
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/*
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* Execute unit test.
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*
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* Load and start the application image.
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*
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* @return: EFI_ST_SUCCESS for success
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*/
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static int execute(void)
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{
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undefined_instruction();
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efi_status_t ret;
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efi_handle_t handle;
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efi_st_error("An undefined instruction exception was not raised\n");
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ret = boottime->load_image(false, image_handle, &dp.dp, image,
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img.length, &handle);
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if (ret != EFI_SUCCESS) {
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efi_st_error("Failed to load image\n");
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return EFI_ST_FAILURE;
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}
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ret = boottime->start_image(handle, NULL, NULL);
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efi_st_error("Exception not triggered\n");
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return EFI_ST_FAILURE;
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}
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@ -45,6 +141,7 @@ static int execute(void)
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EFI_UNIT_TEST(exception) = {
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.name = "exception",
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.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
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.setup = setup,
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.execute = execute,
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.on_request = true,
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};
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@ -0,0 +1,41 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* efi_selftest_miniapp_return
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*
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* Copyright (c) 2019 Heinrich Schuchardt
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*
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* This EFI application triggers an exception.
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*/
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#include <common.h>
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#include <efi_api.h>
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/*
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* Entry point of the EFI application.
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*
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* @handle handle of the loaded image
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* @systable system table
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* @return status code
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*/
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efi_status_t EFIAPI efi_main(efi_handle_t handle,
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struct efi_system_table *systable)
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{
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struct efi_simple_text_output_protocol *con_out = systable->con_out;
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con_out->output_string(con_out,
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L"EFI application triggers exception.\n");
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#if defined(CONFIG_ARM)
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/*
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* 0xe7f...f. is undefined in ARM mode
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* 0xde.. is undefined in Thumb mode
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*/
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asm volatile (".word 0xe7f7defb\n");
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#elif defined(CONFIG_RISCV)
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asm volatile (".word 0xffffffff\n");
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#elif defined(CONFIG_X86)
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asm volatile (".word 0xffff\n");
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#endif
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con_out->output_string(con_out, L"Exception not triggered.\n");
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return EFI_ABORTED;
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}
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