Commit 757b435a authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Will Deacon
Browse files

efi: arm64: Add vmlinux debug link to the Image binary 



When building with debugging symbols, take the absolute path to the
vmlinux binary and add it to the special PE/COFF debug table entry.
This allows a debug EFI build to find the vmlinux binary, which is
very helpful in debugging, given that the offset where the Image is
first loaded by EFI is highly unpredictable.

On implementations of UEFI that choose to implement it, this
information is exposed via the EFI debug support table, which is a UEFI
configuration table that is accessible both by the firmware at boot time
and by the OS at runtime, and lists all PE/COFF images loaded by the
system.

The format of the NB10 Codeview entry is based on the definition used
by EDK2, which is our primary reference when it comes to the use of
PE/COFF in the context of UEFI firmware.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
[will: use realpath instead of shell invocation, as discussed on list]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 965861d6

arch/arm64/Kconfig.debug

+8 −0
Original line number Diff line number Diff line
@@ -95,6 +95,14 @@ config DEBUG_ALIGN_RODATA 


	  If in doubt, say N.



config DEBUG_EFI

	depends on EFI && DEBUG_INFO

	bool "UEFI debugging"

	help

	  Enable this option to include EFI specific debugging features into

	  the kernel that are only useful when using a debug build of the

	  UEFI firmware



source "drivers/hwtracing/coresight/Kconfig"



endmenu

arch/arm64/kernel/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -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_DEBUG_EFI),y)

AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""

endif

arch/arm64/kernel/head.S

+46 −1
Original line number Diff line number Diff line
@@ -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_EFI

	.long	efi_debug_table - _head		// DebugTable

	.long	efi_debug_table_size

#endif



	// Section table

section_table:
@@ -195,6 +200,46 @@ section_table: 
	.short	0		// NumberOfLineNumbers  (0 for executables)

	.long	0xe0500020	// Characteristics (section flags)



#ifdef CONFIG_DEBUG_EFI

	/*

	 * The debug table is referenced via its Relative Virtual Address (RVA),

	 * which is only defined for those parts of the image that are covered

	 * by a section declaration. Since this header is not covered by any

	 * section, the debug table must be emitted elsewhere. So stick it in

	 * the .init.rodata section instead.

	 *

	 * Note that the EFI debug entry itself may legally have a zero RVA,

	 * which means we can simply put it right after the section headers.

	 */

	__INITRODATA



	.align	2

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	0			// RVA

	.long	efi_debug_entry - _head	// FileOffset



	.set	efi_debug_table_size, . - efi_debug_table

	.previous



efi_debug_entry:

	// EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY

	.ascii	"NB10"			// Signature

	.long	0			// Unknown

	.long	0			// Unknown2

	.long	0			// Unknown3



	.asciz	VMLINUX_PATH



	.set	efi_debug_entry_size, . - efi_debug_entry

#endif



	/*

	 * EFI will load .text onwards at the 4k section alignment

	 * described in the PE/COFF header. To ensure that instruction

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