BaseTools: AArch64: use explicit linker scripts

Instead of relying on the builtin linker script of GNU ld, which
may vary based on binutils version (which is not tightly coupled to
the GCC version) and linker command line options, introduce a linker
script for AArch64 to be used by all GCC/binutils versions.

The script is laid out such that two ELF sections .text and .data are
created that map onto the PE/COFF with the same names. By aligning
.data to the minimum alignment of .text, and by not adding any
additional padding -which is what LD's builtin linker script does- the
relative offset between .text and .data is retained after the PE/COFF
conversion. This should prevent problems with debuggers and other
tooling that are ELF based.

Also provided is an overlay linker script that increases the alignment
of .text and .data to 64 KB. This is intended for DXE_RUNTIME_DRIVER
modules, to make them compatible with the newly introduced
Properties Table feature.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Olivier Martin <Olivier.Martin@arm.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17824 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 13 insertions, 10 deletions

diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index 88ec2e138..7edd75909 100644
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -3821,9 +3821,12 @@ DEFINE GCC_ARM_CC_FLAGS            = DEF(GCC_ALL_CC_FLAGS) -mword-relocations -m
 DEFINE GCC_AARCH64_CC_FLAGS        = DEF(GCC_ALL_CC_FLAGS) -mcmodel=large -mlittle-endian -fno-short-enums -save-temps -fverbose-asm -fsigned-char  -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-builtin -Wno-address

 DEFINE GCC_DLINK_FLAGS_COMMON      = -nostdlib --pie

 DEFINE GCC_IA32_X64_DLINK_COMMON   = DEF(GCC_DLINK_FLAGS_COMMON) --gc-sections

-DEFINE GCC_ARM_AARCH64_DLINK_COMMON= -Ttext=0x0 --emit-relocs -nostdlib --gc-sections -u $(IMAGE_ENTRY_POINT) -e $(IMAGE_ENTRY_POINT) -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map

+DEFINE GCC_ARM_AARCH64_DLINK_COMMON= --emit-relocs -nostdlib --gc-sections -u $(IMAGE_ENTRY_POINT) -e $(IMAGE_ENTRY_POINT) -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map

+DEFINE GCC_ARM_DLINK_FLAGS         = DEF(GCC_ARM_AARCH64_DLINK_COMMON) -Ttext=0x0

+DEFINE GCC_AARCH64_DLINK_FLAGS     = DEF(GCC_ARM_AARCH64_DLINK_COMMON) --script=$(EDK_TOOLS_PATH)/Scripts/gcc-aarch64-ld-script

 DEFINE GCC_IA32_X64_ASLDLINK_FLAGS = DEF(GCC_IA32_X64_DLINK_COMMON) --entry _ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT)

-DEFINE GCC_ARM_AARCH64_ASLDLINK_FLAGS = DEF(GCC_ARM_AARCH64_DLINK_COMMON) --entry ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT)

+DEFINE GCC_ARM_ASLDLINK_FLAGS      = DEF(GCC_ARM_DLINK_FLAGS) --entry ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT)

+DEFINE GCC_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_AARCH64_DLINK_FLAGS) --entry ReferenceAcpiTable -u $(IMAGE_ENTRY_POINT)

 DEFINE GCC_IA32_X64_DLINK_FLAGS    = DEF(GCC_IA32_X64_DLINK_COMMON) --entry _$(IMAGE_ENTRY_POINT) --file-alignment 0x20 --section-alignment 0x20 -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map

 DEFINE GCC_IPF_DLINK_FLAGS         = -nostdlib -O2 --gc-sections --dll -static --entry $(IMAGE_ENTRY_POINT) --undefined $(IMAGE_ENTRY_POINT) -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map

 DEFINE GCC_IPF_OBJCOPY_FLAGS       = -I elf64-ia64-little -O efi-bsdrv-ia64

@@ -3866,8 +3869,8 @@ DEFINE GCC46_X64_DLINK_FLAGS         = DEF(GCC45_X64_DLINK_FLAGS)
 DEFINE GCC46_ASM_FLAGS               = DEF(GCC45_ASM_FLAGS)

 DEFINE GCC46_ARM_ASM_FLAGS           = $(ARCHASM_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_ASM_FLAGS) -mlittle-endian

 DEFINE GCC46_ARM_CC_FLAGS            = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC44_ALL_CC_FLAGS) DEF(GCC_ARM_CC_FLAGS) -fstack-protector

-DEFINE GCC46_ARM_DLINK_FLAGS         = DEF(GCC_ARM_AARCH64_DLINK_COMMON) --oformat=elf32-littlearm

-DEFINE GCC46_ARM_ASLDLINK_FLAGS      = DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS) --oformat=elf32-littlearm

+DEFINE GCC46_ARM_DLINK_FLAGS         = DEF(GCC_ARM_DLINK_FLAGS) --oformat=elf32-littlearm

+DEFINE GCC46_ARM_ASLDLINK_FLAGS      = DEF(GCC_ARM_ASLDLINK_FLAGS) --oformat=elf32-littlearm

 

 DEFINE GCC47_IA32_CC_FLAGS           = DEF(GCC46_IA32_CC_FLAGS)

 DEFINE GCC47_X64_CC_FLAGS            = DEF(GCC46_X64_CC_FLAGS)

@@ -3881,9 +3884,9 @@ DEFINE GCC47_AARCH64_ASM_FLAGS       = $(ARCHASM_FLAGS) $(PLATFORM_FLAGS) DEF(GC
 DEFINE GCC47_ARM_CC_FLAGS            = DEF(GCC46_ARM_CC_FLAGS) -mno-unaligned-access

 DEFINE GCC47_AARCH64_CC_FLAGS        = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC44_ALL_CC_FLAGS) DEF(GCC_AARCH64_CC_FLAGS)

 DEFINE GCC47_ARM_DLINK_FLAGS         = DEF(GCC46_ARM_DLINK_FLAGS)

-DEFINE GCC47_AARCH64_DLINK_FLAGS     = DEF(GCC_ARM_AARCH64_DLINK_COMMON)

+DEFINE GCC47_AARCH64_DLINK_FLAGS     = DEF(GCC_AARCH64_DLINK_FLAGS)

 DEFINE GCC47_ARM_ASLDLINK_FLAGS      = DEF(GCC46_ARM_ASLDLINK_FLAGS)

-DEFINE GCC47_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS)

+DEFINE GCC47_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_AARCH64_ASLDLINK_FLAGS)

 

 DEFINE GCC48_IA32_CC_FLAGS           = DEF(GCC47_IA32_CC_FLAGS)

 DEFINE GCC48_X64_CC_FLAGS            = DEF(GCC47_X64_CC_FLAGS)

@@ -3897,9 +3900,9 @@ DEFINE GCC48_AARCH64_ASM_FLAGS       = DEF(GCC47_AARCH64_ASM_FLAGS)
 DEFINE GCC48_ARM_CC_FLAGS            = DEF(GCC47_ARM_CC_FLAGS)

 DEFINE GCC48_AARCH64_CC_FLAGS        = DEF(GCC47_AARCH64_CC_FLAGS)

 DEFINE GCC48_ARM_DLINK_FLAGS         = DEF(GCC47_ARM_DLINK_FLAGS)

-DEFINE GCC48_AARCH64_DLINK_FLAGS     = DEF(GCC_ARM_AARCH64_DLINK_COMMON)

+DEFINE GCC48_AARCH64_DLINK_FLAGS     = DEF(GCC47_AARCH64_DLINK_FLAGS)

 DEFINE GCC48_ARM_ASLDLINK_FLAGS      = DEF(GCC47_ARM_ASLDLINK_FLAGS)

-DEFINE GCC48_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS)

+DEFINE GCC48_AARCH64_ASLDLINK_FLAGS  = DEF(GCC47_AARCH64_ASLDLINK_FLAGS)

 

 DEFINE GCC49_IA32_CC_FLAGS           = DEF(GCC48_IA32_CC_FLAGS)

 DEFINE GCC49_X64_CC_FLAGS            = DEF(GCC48_X64_CC_FLAGS)

@@ -3913,9 +3916,9 @@ DEFINE GCC49_AARCH64_ASM_FLAGS       = DEF(GCC48_AARCH64_ASM_FLAGS)
 DEFINE GCC49_ARM_CC_FLAGS            = DEF(GCC48_ARM_CC_FLAGS)

 DEFINE GCC49_AARCH64_CC_FLAGS        = DEF(GCC48_AARCH64_CC_FLAGS)

 DEFINE GCC49_ARM_DLINK_FLAGS         = DEF(GCC48_ARM_DLINK_FLAGS)

-DEFINE GCC49_AARCH64_DLINK_FLAGS     = DEF(GCC_ARM_AARCH64_DLINK_COMMON)

+DEFINE GCC49_AARCH64_DLINK_FLAGS     = DEF(GCC48_AARCH64_DLINK_FLAGS)

 DEFINE GCC49_ARM_ASLDLINK_FLAGS      = DEF(GCC48_ARM_ASLDLINK_FLAGS)

-DEFINE GCC49_AARCH64_ASLDLINK_FLAGS  = DEF(GCC_ARM_AARCH64_ASLDLINK_FLAGS)

+DEFINE GCC49_AARCH64_ASLDLINK_FLAGS  = DEF(GCC48_AARCH64_ASLDLINK_FLAGS)

 

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