BaseTools/Scripts: Merge GCC and Clang ELF linker scripts

The original reason for creating a separate version of the ELF linker
script for Clang was the difference between COMMONPAGESIZE and
MAXPAGESIZE, which can we provided on the command line to the respective
linkers (ld.bfd versus lld). That difference no longer exists, and both
use COMMONPAGE_SIZE. So there is no longer a need to maintain a fork,
which has already been going out of sync with the original for no good
reason.

So merge the two and call it GccBase.lds

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

BaseTools/Conf/tools_def.template

@@ -2036,7 +2036,7 @@ DEFINE CLANGDWARF_X64_PREFIX        = ENV(CLANG_BIN)
 # LLVM/CLANG doesn't support -n link option. So, it can't share the same IA32_X64_DLINK_COMMON flag.
 # LLVM/CLANG doesn't support common page size. So, it can't share the same GccBase.lds script.
 DEFINE CLANGDWARF_IA32_X64_DLINK_COMMON   = -nostdlib -Wl,-q,--gc-sections -z common-page-size=0x40
-DEFINE CLANGDWARF_DLINK2_FLAGS_COMMON     = -Wl,--script=$(EDK_TOOLS_PATH)/Scripts/ClangBase.lds
+DEFINE CLANGDWARF_DLINK2_FLAGS_COMMON     = -Wl,--script=$(EDK_TOOLS_PATH)/Scripts/GccBase.lds
 DEFINE CLANGDWARF_IA32_X64_ASLDLINK_FLAGS = DEF(CLANGDWARF_IA32_X64_DLINK_COMMON) -Wl,--defsym=PECOFF_HEADER_SIZE=0 DEF(CLANGDWARF_DLINK2_FLAGS_COMMON) -Wl,--entry,ReferenceAcpiTable -u ReferenceAcpiTable
 DEFINE CLANGDWARF_IA32_X64_DLINK_FLAGS    = DEF(CLANGDWARF_IA32_X64_DLINK_COMMON) -Wl,--entry,$(IMAGE_ENTRY_POINT) -u $(IMAGE_ENTRY_POINT) -Wl,-Map,$(DEST_DIR_DEBUG)/$(BASE_NAME).map,--whole-archive -Wl,-z,notext
 DEFINE CLANGDWARF_IA32_DLINK2_FLAGS       = -Wl,--defsym=PECOFF_HEADER_SIZE=0x220 DEF(CLANGDWARF_DLINK2_FLAGS_COMMON)
@@ -2216,7 +2216,6 @@ RELEASE_CLANGDWARF_AARCH64_DLINK_FLAGS = DEF(CLANGDWARF_AARCH64_DLINK_FLAGS) -fl
 DEFINE CLANGDWARF_RISCV64_TARGET    = -target riscv64-linux-gnu
 DEFINE CLANGDWARF_RISCV64_CC_COMMON = DEF(GCC5_RISCV_ALL_CC_FLAGS) DEF(GCC5_RISCV_ALL_CC_FLAGS_WARNING_DISABLE) DEF(GCC5_RISCV_OPENSBI_TYPES) -march=DEF(GCC5_RISCV64_ARCH) -fno-builtin -fno-builtin-memcpy -fno-stack-protector -Wno-address -fno-asynchronous-unwind-tables -fno-unwind-tables -Wno-unused-but-set-variable -fpack-struct=8 -mcmodel=medany -mabi=lp64 -mno-relax
 DEFINE CLANGDWARF_RISCV64_CC_FLAGS  = DEF(CLANGDWARF_RISCV64_CC_COMMON) DEF(CLANGDWARF_RISCV64_TARGET) DEF(CLANGDWARF_WARNING_OVERRIDES)
-DEFINE CLANGDWARF_DLINK2_FLAGS_COMMON     = -Wl,--script=$(EDK_TOOLS_PATH)/Scripts/ClangBase.lds
 
 # This is similar to GCC flags but without -n
 DEFINE CLANGDWARF_RISCV64_ALL_DLINK_COMMON  = -nostdlib -Wl,-q,--gc-sections -z common-page-size=0x40

BaseTools/Scripts/ClangBase.lds

@@ -1,89 +0,0 @@
-/** @file
-
-  Unified linker script for CLANG based builds
-
-  Copyright (c) 2010 - 2021, Intel Corporation. All rights reserved.<BR>
-  Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
-  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
-
-  SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-SECTIONS {
-
-  /*
-   * The PE/COFF binary consists of DOS and PE/COFF headers, and a sequence of
-   * section headers adding up to PECOFF_HEADER_SIZE bytes (which differs
-   * between 32-bit and 64-bit builds). The actual start of the .text section
-   * will be rounded up based on its actual alignment.
-   */
-  . = PECOFF_HEADER_SIZE;
-
-  .text : ALIGN(CONSTANT(COMMONPAGESIZE)) {
-    KEEP(*(.entry))
-    *(.text .text.* .stub .gnu.linkonce.t.*)
-    *(.rodata .rodata.* .gnu.linkonce.r.*)
-    *(.got .got.*)
-
-    /*
-     * The contents of AutoGen.c files are mostly constant from the POV of the
-     * program, but most of it ends up in .data or .bss by default since few of
-     * the variable definitions that get emitted are declared as CONST.
-     * Unfortunately, we cannot pull it into the .text section entirely, since
-     * patchable PCDs are also emitted here, but we can at least move all of the
-     * emitted GUIDs here.
-     */
-    *:AutoGen.obj(.data.g*Guid)
-  }
-
-  /*
-   * The alignment of the .data section should be less than or equal to the
-   * alignment of the .text section. This ensures that the relative offset
-   * between these sections is the same in the ELF and the PE/COFF versions of
-   * this binary.
-   */
-  .data ALIGN(ALIGNOF(.text)) : ALIGN(CONSTANT(COMMONPAGESIZE)) {
-    *(.data .data.* .gnu.linkonce.d.*)
-    *(.bss .bss.*)
-  }
-
-  .eh_frame ALIGN(CONSTANT(COMMONPAGESIZE)) : {
-    KEEP (*(.eh_frame))
-  }
-
-  .rela (INFO) : {
-    *(.rela .rela.*)
-  }
-
-  .hii : ALIGN(CONSTANT(COMMONPAGESIZE)) {
-    KEEP (*(.hii))
-  }
-
-  .got : {
-    *(.got)
-  }
-  ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")
-
-  .got.plt (INFO) : {
-    *(.got.plt)
-  }
-  ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0xc || SIZEOF(.got.plt) == 0x18, "Unexpected GOT/PLT entries detected!")
-
-  /*
-   * Retain the GNU build id but in a non-allocatable section so GenFw
-   * does not copy it into the PE/COFF image.
-   */
-  .build-id (INFO) : { *(.note.gnu.build-id) }
-
-  /DISCARD/ : {
-    *(.note.GNU-stack)
-    *(.gnu_debuglink)
-    *(.interp)
-    *(.dynsym)
-    *(.dynstr)
-    *(.hash .gnu.hash)
-    *(.comment)
-    *(COMMON)
-  }
-}

BaseTools/Scripts/GccBase.lds

@@ -1,8 +1,8 @@
 /** @file
 
-  Unified linker script for GCC based builds
+  Unified linker script for GCC and CLANG based builds
 
-  Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2010 - 2021, Intel Corporation. All rights reserved.<BR>
   Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
   (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 
@@ -21,6 +21,7 @@ SECTIONS {
   . = PECOFF_HEADER_SIZE;
 
   .text : ALIGN(CONSTANT(COMMONPAGESIZE)) {
+    KEEP(*(.entry))
     *(.text .text.* .stub .gnu.linkonce.t.*)
     *(.rodata .rodata.* .gnu.linkonce.r.*)
     *(.got .got.*)
@@ -81,7 +82,6 @@ SECTIONS {
     *(.interp)
     *(.dynsym)
     *(.dynstr)
-    *(.dynamic)
     *(.hash .gnu.hash)
     *(.comment)
   }