diff options
| -rw-r--r-- | GNU_efi_HelloWorld/Makefile_save | 36 | ||||
| -rw-r--r-- | documentation/GNU-efi | 36 |
2 files changed, 72 insertions, 0 deletions
diff --git a/GNU_efi_HelloWorld/Makefile_save b/GNU_efi_HelloWorld/Makefile_save new file mode 100644 index 0000000..6ae963d --- /dev/null +++ b/GNU_efi_HelloWorld/Makefile_save @@ -0,0 +1,36 @@ +ARCH = $(shell uname -m | sed s,i[3456789]86,ia32,) + +OBJS = hello.o +TARGET = hello.efi + +EFIINC = /usr/include/efi +EFFINCS = -I$(EFIINC) -I$(EFIINC)/$(ARCH) -I$(EFIINC)/protocol +EFILIB = /usr/lib +EFI_CRT_OBJS = $(EFILIB)/crt0-efi-$(ARCH).o +EFI_LDS = $(EFILIB)/elf_$(ARCH)_efi.lds + +CFLAGS = $(EFFINCS) -fno-stack-protector -fpic \ + -fshort-wchar -mno-red-zone -Wall + +ifeq ($(ARCH),x86_64) + CFLAGS += -DEFI_FUNCTION_WRAPPER +endif + +LDFLAGS = -nostdlib -znocombreloc -T $(EFI_LDS) -shared \ + -Bsymbolic -L $(EFILIB) $(EFI_CRT_OBJS) + +all: $(TARGET) + cp hello.efi ../test_code/hda-contents/ + +hello.so: $(OBJS) + ld $(LDFLAGS) $(OBJS) -o $@ -lefi -lgnuefi + +%.efi: %.so + objcopy -j .text -j .sdata -j .data -j .dynamic \ + -j .dynsym -j .rel -j .rela -j .reloc \ + --target=efi-app-$(ARCH) $^ $@ + +clear: + rm *.efi + rm *.o + rm *.so diff --git a/documentation/GNU-efi b/documentation/GNU-efi index 5d75960..1efe81c 100644 --- a/documentation/GNU-efi +++ b/documentation/GNU-efi @@ -190,3 +190,39 @@ ST->ConOut->OutputString(ST->ConOut, buffer); # https://wiki.osdev.org/Debugging_UEFI_applications_with_GDB # ################################################################################# +Makefile at: +https://sourceforge.net/p/ast-phoenix/code/ci/master/tree/kernel/boot/Makefile#l72 + +EFI firmware is unable to launch binaries with debug sections. What you need is +to create two EFI binaries - one with only required sections to upload it to +target system and another one with debug symbols to use with GDB. Actually you +just need to run objcopy utility twice with different set of sections to copy and +different output files. (See Makefile example) + +To load image with symbols to relocated addresses for .text and .data sections, +you need to add ImageBase address to their offsets: + +********************************************************************************* +* # gdb hello.efi * +* (gdb) info files * +* ... * +* Entry point: 0x3000 * +* 3000 - ... is .text * +* c00 - ... is .data * +* (gdb) file || unload file * +* add-symbol-table hello.efi (ImageBase+text-off) -s .data (ImageBase+data-off) * +********************************************************************************* + + + + + + + + + + + + + + |