When building with debugging symbols, take the absolute path to the vmlinux binary and add it to the special PE/COFF debug table entry. These entries are used internally by EDK2 based* debug builds of UEFI to populate the DebugImageInfo table, which can be used by debuggers as well as by the OS itself to retrieve information about all loaded PE/COFF executables. This is highly useful for source level debugging of the UEFI stub. * for AArch64, this probably means all of them Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> --- arch/arm64/kernel/Makefile | 4 +++ arch/arm64/kernel/head.S | 34 +++++++++++++++++++- arch/arm64/kernel/image.h | 3 ++ 3 files changed, 40 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 7d66bbaafc0c..6dbc0e5527f5 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -55,3 +55,7 @@ obj-y += $(arm64-obj-y) vdso/ probes/ obj-m += $(arm64-obj-m) head-y := head.o extra-y += $(head-y) vmlinux.lds + +ifeq ($(CONFIG_EFI)$(CONFIG_DEBUG_INFO),yy) +AFLAGS_head.o += -DVMLINUX_PATH="\"$(shell readlink -f $(objtree)/vmlinux)\"" +endif diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 4b1abac3485a..b462ab1f11ef 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -149,7 +149,7 @@ extra_header_fields: .quad 0 // SizeOfHeapReserve .quad 0 // SizeOfHeapCommit .long 0 // LoaderFlags - .long 0x6 // NumberOfRvaAndSizes + .long (section_table - .) / 8 // NumberOfRvaAndSizes .quad 0 // ExportTable .quad 0 // ImportTable @@ -158,6 +158,11 @@ extra_header_fields: .quad 0 // CertificationTable .quad 0 // BaseRelocationTable +#ifdef CONFIG_DEBUG_INFO + .long efi_debug_table - _head // DebugTable + .long efi_debug_table_size +#endif + // Section table section_table: @@ -204,6 +209,33 @@ section_table: */ .align 12 efi_header_end: + +#ifdef CONFIG_DEBUG_INFO + __INITDATA + +efi_debug_table: + // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long 2 // Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW + .long efi_debug_entry_size // SizeOfData + .long efi_debug_entry_offset // RVA + .long efi_debug_entry_offset // FileOffset + +ENTRY(efi_debug_entry) + // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY + .long 0x3031424E // Signature + .long 0 // Unknown + .long 0 // Unknown2 + .long 0 // Unknown3 + + .asciz VMLINUX_PATH + + .set efi_debug_entry_size, . - efi_debug_entry + .set efi_debug_table_size, . - efi_debug_table +#endif #endif __INIT diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h index c7fcb232fe47..ad5406f011c2 100644 --- a/arch/arm64/kernel/image.h +++ b/arch/arm64/kernel/image.h @@ -116,6 +116,9 @@ __efistub__end = KALLSYMS_HIDE(_end); __efistub__edata = KALLSYMS_HIDE(_edata); __efistub_screen_info = KALLSYMS_HIDE(screen_info); +#ifdef CONFIG_DEBUG_INFO +efi_debug_entry_offset = efi_debug_entry - _text; +#endif #endif #endif /* __ASM_IMAGE_H */ -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
