xref: /OK3568_Linux_fs/buildroot/boot/syslinux/0010-core-Clean-up-the-i386-bios-build.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From a14b1b3d3e375d2e8af8804171ef5e52574dbb2a Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Tue, 9 Feb 2016 18:15:50 -0800
Subject: [PATCH] core: Clean up the i386-bios build

Remove symbols and data structures not used in the i386-bios build,
and clean up the linker script so that most internal symbols are
HIDDEN.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Upstream: ff859050fa4e6535cae098dc35d88a265466448d

This patch fixes the following build failure with i386 binutils 2.28.1:

/builds/arnout/buildroot/output/host/bin/i586-buildroot-linux-uclibc-ld  -Bsymbolic -pie -E --hash-style=gnu -T
/builds/arnout/buildroot/output/build/syslinux-6.03/core/i386/syslinux.ld -M -o ldlinux.elf ldlinux.o \
	--start-group libcom32.a --whole-archive /builds/arnout/buildroot/output/build/syslinux-6.03/bios/com32/lib/libcom32core.a libldlinux.a --end-group -N
--no-omagic \
	> ldlinux.map
/builds/arnout/buildroot/output/host/bin/i586-buildroot-linux-uclibc-ld: ldlinux.elf: Not enough room for program headers, try linking with -N
/builds/arnout/buildroot/output/host/bin/i586-buildroot-linux-uclibc-ld: final link failed: Bad value
/builds/arnout/buildroot/output/build/syslinux-6.03/core/Makefile:167: recipe for target 'ldlinux.elf' failed

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
 core/extern.inc       |  17 +--
 core/i386/syslinux.ld | 287 +++++++++++++++++++++++++-------------------------
 core/layout.inc       |  11 --
 3 files changed, 143 insertions(+), 172 deletions(-)

diff --git a/core/extern.inc b/core/extern.inc
index af8eb04c..ce4abfab 100644
--- a/core/extern.inc
+++ b/core/extern.inc
@@ -12,27 +12,17 @@
 	; hello.c
 	extern hello

-	;abort.c
-	extern abort_load_new
-
 	; elflink/load_env32.c
 	extern load_env32, pm_env32_run

-	; memscan.c
-	extern highmem_init
-
-	extern linux_kernel
-
 	extern mp1, mp2, mp3, mp4, mp5

-	extern hexdump, mydump
+	extern hexdump

 	extern mem_init

 	; fs.c
-	extern pm_fs_init, pm_searchdir, getfssec, getfsbytes
-	extern pm_mangle_name, pm_load_config
-        extern pm_open_file, pm_close_file
+	extern pm_fs_init
 	extern SectorSize, SectorShift

 	; chdir.c
@@ -41,9 +31,6 @@
         ; readdir.c
         extern opendir, readdir, closedir

-	; newconfig.c
-	extern pm_is_config_file
-
 	; idle.c
 	extern __idle

diff --git a/core/i386/syslinux.ld b/core/i386/syslinux.ld
index 92b75b11..39198d75 100644
--- a/core/i386/syslinux.ld
+++ b/core/i386/syslinux.ld
@@ -1,7 +1,7 @@
 /* -----------------------------------------------------------------------
  *
  *   Copyright 2008-2009 H. Peter Anvin - All Rights Reserved
- *   Copyright 2009 Intel Corporation; author: H. Peter Anvin
+ *   Copyright 2009-2016 Intel Corporation; author: H. Peter Anvin
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -12,7 +12,7 @@
  * ----------------------------------------------------------------------- */

 /*
- * Linker script for the SYSLINUX core
+ * Linker script for the SYSLINUX core when built for i386-bios
  */

 OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
@@ -26,7 +26,7 @@ SECTIONS
 {
 	/* Prefix structure for the compression program */
 	. = 0;
-	__module_start = .;
+	HIDDEN(__module_start = ABSOLUTE(.));
 	.prefix : {
 		*(.prefix)
 	}
@@ -35,81 +35,82 @@ SECTIONS
 	. = 0x1000;

 	.earlybss (NOLOAD) : {
-		__earlybss_start = .;
+		HIDDEN(__earlybss_start = .);
 		*(.earlybss)
-		__earlybss_end = .;
+		HIDDEN(__earlybss_end = .);
 	}
-	__earlybss_len = ABSOLUTE(__earlybss_end) - ABSOLUTE(__earlybss_start);
-	__earlybss_dwords = (__earlybss_len + 3) >> 2;
+	HIDDEN(__earlybss_len = ABSOLUTE(__earlybss_end) - ABSOLUTE(__earlybss_start));
+	HIDDEN(__earlybss_dwords = (__earlybss_len + 3) >> 2);

 	. = ALIGN(4);
 	.bss16 (NOLOAD) : {
-		__bss16_start = .;
+		HIDDEN(__bss16_start = .);
 		*(.bss16)
-		__bss16_end = .;
+		HIDDEN(__bss16_end = .);
 	}
-	__bss16_len = ABSOLUTE(__bss16_end) - ABSOLUTE(__bss16_start);
-	__bss16_dwords = (__bss16_len + 3) >> 2;
+	HIDDEN(__bss16_len = ABSOLUTE(__bss16_end) - ABSOLUTE(__bss16_start));
+	HIDDEN(__bss16_dwords = (__bss16_len + 3) >> 2);

 	. = ALIGN(4);
  	.config : AT (__config_lma) {
-		__config_start = .;
+		HIDDEN(__config_start = .);
 		*(.config)
-		__config_end = .;
+		HIDDEN(__config_end = .);
 	}
-	__config_len = ABSOLUTE(__config_end) - ABSOLUTE(__config_start);
-	__config_dwords = (__config_len + 3) >> 2;
+	HIDDEN(__config_len = ABSOLUTE(__config_end) - ABSOLUTE(__config_start));
+	HIDDEN(__config_dwords = (__config_len + 3) >> 2);

 	/* Generated and/or copied code */

 	. = ALIGN(128);		/* Minimum separation from mutable data */
  	.replacestub : AT (__replacestub_lma) {
-		__replacestub_start = .;
+		HIDDEN(__replacestub_start = .);
 		*(.replacestub)
-		__replacestub_end = .;
+		HIDDEN(__replacestub_end = .);
 	}
-	__replacestub_len = ABSOLUTE(__replacestub_end) - ABSOLUTE(__replacestub_start);
-	__replacestub_dwords = (__replacestub_len + 3) >> 2;
+	HIDDEN(__replacestub_len = ABSOLUTE(__replacestub_end) - ABSOLUTE(__replacestub_start));
+	HIDDEN(__replacestub_dwords = (__replacestub_len + 3) >> 2);

 	. = ALIGN(16);
-	__gentextnr_lma = .;
+	HIDDEN(__gentextnr_lma = .);
 	.gentextnr : AT(__gentextnr_lma) {
-		__gentextnr_start = .;
+		HIDDEN(__gentextnr_start = .);
 		*(.gentextnr)
-		__gentextnr_end = .;
+		HIDDEN(__gentextnr_end = .);
 	}
-	__gentextnr_len = ABSOLUTE(__gentextnr_end) - ABSOLUTE(__gentextnr_start);
-	__gentextnr_dwords = (__gentextnr_len + 3) >> 2;
+	HIDDEN(__gentextnr_len = ABSOLUTE(__gentextnr_end) - ABSOLUTE(__gentextnr_start));
+	HIDDEN(__gentextnr_dwords = (__gentextnr_len + 3) >> 2);

 	. = STACK_BASE;
 	.stack16 : AT(STACK_BASE) {
-		__stack16_start = .;
+		HIDDEN(__stack16_start = .);
 		. += STACK_LEN;
-		__stack16_end = .;
+		HIDDEN(__stack16_end = .);
 	}
-	__stack16_len = ABSOLUTE(__stack16_end) - ABSOLUTE(__stack16_start);
-	__stack16_dwords = (__stack16_len + 3) >> 2;
+	HIDDEN(__stack16_len = ABSOLUTE(__stack16_end) - ABSOLUTE(__stack16_start));
+	HIDDEN(__stack16_dwords = (__stack16_len + 3) >> 2);

 	/* Initialized sections */

 	. = 0x7c00;
 	.init : {
 		FILL(0x90909090)
-		__init_start = .;
+		HIDDEN(__init_start = .);
 		*(.init)
-		__init_end = .;
+		HIDDEN(__init_end = .);
 	}
-	__init_len = ABSOLUTE(__init_end) - ABSOLUTE(__init_start);
-	__init_dwords = (__init_len + 3) >> 2;
+	HIDDEN(__init_len = ABSOLUTE(__init_end) - ABSOLUTE(__init_start));
+	HIDDEN(__init_dwords = (__init_len + 3) >> 2);

+	. = ALIGN(4);
 	.text16 : {
 		FILL(0x90909090)
-		__text16_start = .;
+		HIDDEN(__text16_start = .);
 		*(.text16)
-		__text16_end = .;
+		HIDDEN(__text16_end = .);
 	}
-	__text16_len = ABSOLUTE(__text16_end) - ABSOLUTE(__text16_start);
-	__text16_dwords = (__text16_len + 3) >> 2;
+	HIDDEN(__text16_len = ABSOLUTE(__text16_end) - ABSOLUTE(__text16_start));
+	HIDDEN(__text16_dwords = (__text16_len + 3) >> 2);

 	/*
 	 * .textnr is used for 32-bit code that is used on the code
@@ -118,99 +119,92 @@ SECTIONS
 	. = ALIGN(16);
 	.textnr : {
 		FILL(0x90909090)
-		__textnr_start = .;
+		HIDDEN(__textnr_start = .);
 		*(.textnr)
-		__textnr_end = .;
+		HIDDEN(__textnr_end = .);
 	}
-	__textnr_len = ABSOLUTE(__textnr_end) - ABSOLUTE(__textnr_start);
-	__textnr_dwords = (__textnr_len + 3) >> 2;
+	HIDDEN(__textnr_len = ABSOLUTE(__textnr_end) - ABSOLUTE(__textnr_start));
+	HIDDEN(__textnr_dwords = (__textnr_len + 3) >> 2);

 	. = ALIGN(16);
-	__bcopyxx_start = .;
+	HIDDEN(__bcopyxx_start = .);

 	.bcopyxx.text : {
 		FILL(0x90909090)
-		__bcopyxx_text_start = .;
+		HIDDEN(__bcopyxx_text_start = .);
 		*(.bcopyxx.text)
-		__bcopyxx_text_end = .;
+		HIDDEN(__bcopyxx_text_end = .);
 	}
-	__bcopyxx_text_len = ABSOLUTE(__bcopyxx_text_end) - ABSOLUTE(__bcopyxx_text_start);
-	__bcopyxx_text_dwords = (__bcopyxx_text_len + 3) >> 2;
+	HIDDEN(__bcopyxx_text_len = ABSOLUTE(__bcopyxx_text_end) - ABSOLUTE(__bcopyxx_text_start));
+	HIDDEN(__bcopyxx_text_dwords = (__bcopyxx_text_len + 3) >> 2);

 	.bcopyxx.data : {
-		__bcopyxx_data_start = .;
+		HIDDEN(__bcopyxx_data_start = .);
 		*(.bcopyxx.text)
-		__bcopyxx_data_end = .;
+		HIDDEN(__bcopyxx_data_end = .);
 	}
-	__bcopyxx_data_len = ABSOLUTE(__bcopyxx_data_end) - ABSOLUTE(__bcopyxx_data_start);
-	__bcopyxx_data_dwords = (__bcopyxx_data_len + 3) >> 2;
+	HIDDEN(__bcopyxx_data_len = ABSOLUTE(__bcopyxx_data_end) - ABSOLUTE(__bcopyxx_data_start));
+	HIDDEN(__bcopyxx_data_dwords = (__bcopyxx_data_len + 3) >> 2);

-	__bcopyxx_end = .;
-	__bcopyxx_len = ABSOLUTE(__bcopyxx_end) - ABSOLUTE(__bcopyxx_start);
-	__bcopyxx_dwords = (__bcopyxx_len + 3) >> 2;
+	HIDDEN(__bcopyxx_end = .);
+	HIDDEN(__bcopyxx_len = ABSOLUTE(__bcopyxx_end) - ABSOLUTE(__bcopyxx_start));
+	HIDDEN(__bcopyxx_dwords = (__bcopyxx_len + 3) >> 2);

 	. = ALIGN(4);
 	.data16 : {
-	      __data16_start = .;
+	      HIDDEN(__data16_start = .);
 	      *(.data16)
-	      __data16_end = .;
+	      HIDDEN(__data16_end = .);
 	}
-	__data16_len = ABSOLUTE(__data16_end) - ABSOLUTE(__data16_start);
-	__data16_dwords = (__data16_len + 3) >> 2;
+	HIDDEN(__data16_len = ABSOLUTE(__data16_end) - ABSOLUTE(__data16_start));
+	HIDDEN(__data16_dwords = (__data16_len + 3) >> 2);

 	. = ALIGN(4);
-	__config_lma = .;
+	HIDDEN(__config_lma = ABSOLUTE(.));
 	. += SIZEOF(.config);

 	. = ALIGN(4);
-	__replacestub_lma = .;
+	HIDDEN(__replacestub_lma = ABSOLUTE(.));
 	. += SIZEOF(.replacestub);

 	/* The 32-bit code loads above the non-progbits sections */

 	. = ALIGN(16);
-	__pm_code_lma = .;
+	HIDDEN(__pm_code_lma = ABSOLUTE(.));

-	__high_clear_start = .;
+	HIDDEN(__high_clear_start = .);

 	. = ALIGN(512);
 	.adv (NOLOAD) : {
-		__adv_start = .;
+		HIDDEN(__adv_start = .);
 		*(.adv)
-		__adv_end = .;
+		HIDDEN(__adv_end = .);
 	}
-	__adv_len = ABSOLUTE(__adv_end) - ABSOLUTE(__adv_start);
-	__adv_dwords = (__adv_len + 3) >> 2;
+	HIDDEN(__adv_len = ABSOLUTE(__adv_end) - ABSOLUTE(__adv_start));
+	HIDDEN(__adv_dwords = (__adv_len + 3) >> 2);

 	/* Late uninitialized sections */

 	. = ALIGN(4);
 	.uibss (NOLOAD) : {
-		__uibss_start = .;
+		HIDDEN(__uibss_start = .);
 		*(.uibss)
-		__uibss_end = .;
+		HIDDEN(__uibss_end = .);
 	}
-	__uibss_len = ABSOLUTE(__uibss_end) - ABSOLUTE(__uibss_start);
-	__uibss_dwords = (__uibss_len + 3) >> 2;
+	HIDDEN(__uibss_len = ABSOLUTE(__uibss_end) - ABSOLUTE(__uibss_start));
+	HIDDEN(__uibss_dwords = (__uibss_len + 3) >> 2);

-	_end16 = .;
-	__assert_end16 = ASSERT(_end16 <= 0x10000, "64K overflow");
+	HIDDEN(_end16 = .);
+	HIDDEN(__assert_end16 = ASSERT(_end16 <= 0x10000, "64K overflow"));

 	/*
 	 * Special 16-bit segments
 	 */
-
-	. = ALIGN(65536);
-	.real_mode (NOLOAD) : {
-		*(.real_mode)
-	}
-	real_mode_seg = core_real_mode >> 4;
-
 	. = ALIGN(65536);
 	.xfer_buf (NOLOAD) : {
 		*(.xfer_buf)
 	}
-	xfer_buf_seg = core_xfer_buf >> 4;
+	HIDDEN(xfer_buf_seg = core_xfer_buf >> 4);

 	/*
 	 * The auxilliary data segment is used by the 16-bit code
@@ -219,33 +213,33 @@ SECTIONS

 	. = ALIGN(16);
 	.auxseg (NOLOAD) : {
-		__auxseg_start = .;
+		HIDDEN(__auxseg_start = .);
 		*(.auxseg)
-		__auxseg_end = .;
+		HIDDEN(__auxseg_end = .);
 	}
-	__auxseg_len = ABSOLUTE(__auxseg_end) - ABSOLUTE(__auxseg_start);
-	__auxseg_dwords = (__auxseg_len + 3) >> 2;
-	aux_seg = __auxseg_start >> 4;
+	HIDDEN(__auxseg_len = ABSOLUTE(__auxseg_end) - ABSOLUTE(__auxseg_start));
+	HIDDEN(__auxseg_dwords = (__auxseg_len + 3) >> 2);
+	HIDDEN(aux_seg = __auxseg_start >> 4);

 	/*
 	 * Used to allocate lowmem buffers from 32-bit code
 	 */
 	.lowmem (NOLOAD) : {
-		__lowmem_start = .;
+		HIDDEN(__lowmem_start = .);
 		*(.lowmem)
-		__lowmem_end = .;
+		HIDDEN(__lowmem_end = .);
 	}
-	__lowmem_len = ABSOLUTE(__lowmem_end) - ABSOLUTE(__lowmem_start);
-	__lowmem_dwords = (__lowmem_len + 3) >> 2;
+	HIDDEN(__lowmem_len = ABSOLUTE(__lowmem_end) - ABSOLUTE(__lowmem_start));
+	HIDDEN(__lowmem_dwords = (__lowmem_len + 3) >> 2);

-	__high_clear_end = .;
+	HIDDEN(__high_clear_end = .);

-	__high_clear_len = ABSOLUTE(__high_clear_end) - ABSOLUTE(__high_clear_start);
-	__high_clear_dwords = (__high_clear_len + 3) >> 2;
+	HIDDEN(__high_clear_len = ABSOLUTE(__high_clear_end) - ABSOLUTE(__high_clear_start));
+	HIDDEN(__high_clear_dwords = (__high_clear_len + 3) >> 2);

 	/* Start of the lowmem heap */
 	. = ALIGN(16);
-	__lowmem_heap = .;
+	HIDDEN(__lowmem_heap = .);

 	/*
 	 * 32-bit code.  This is a hack for the moment due to the
@@ -254,136 +248,137 @@ SECTIONS

 	. = 0x100000;

-	__pm_code_start = .;
-	__vma_to_lma = __pm_code_lma - __pm_code_start;
+	HIDDEN(__pm_code_start = .);
+	HIDDEN(__vma_to_lma = ABSOLUTE(__pm_code_lma - __pm_code_start));

 	.text : AT(ADDR(.text) + __vma_to_lma) {
 		FILL(0x90909090)
-		__text_start = .;
+		HIDDEN(__text_start = .);
 		*(.text)
 		*(.text.*)
-		__text_end = .;
+		HIDDEN(__text_end = .);
 	}

 	.rodata : AT(ADDR(.rodata) + __vma_to_lma) {
-		__rodata_start = .;
+		HIDDEN(__rodata_start = .);
 		*(.rodata)
 		*(.rodata.*)
-		__rodata_end = .;
+		HIDDEN(__rodata_end = .);
 	}

 	.ctors : AT(ADDR(.ctors) + __vma_to_lma) {
-		__ctors_start = .;
+		HIDDEN(__ctors_start = .);
 		KEEP (*(SORT(.ctors.*)))
 		KEEP (*(.ctors))
-		__ctors_end = .;
+		HIDDEN(__ctors_end = .);
 	}

 	.dtors : AT(ADDR(.dtors) + __vma_to_lma) {
-		__dtors_start = .;
+		HIDDEN(__dtors_start = .);
 		KEEP (*(SORT(.dtors.*)))
 		KEEP (*(.dtors))
-		__dtors_end = .;
+		HIDDEN(__dtors_end = .);
 	}

 	.dynsym : AT(ADDR(.dynsym) + __vma_to_lma) {
-		__dynsym_start = .;
-		*(.dynsym)
-		__dynsym_end = .;
+		HIDDEN(__dynsym_start = .);
+		KEEP (*(.dynsym))
+		HIDDEN(__dynsym_end = .);
 	}
-	__dynsym_len = __dynsym_end - __dynsym_start;
+	HIDDEN(__dynsym_len = __dynsym_end - __dynsym_start);

 	.dynstr : AT(ADDR(.dynstr) + __vma_to_lma) {
-		__dynstr_start = .;
-		*(.dynstr)
-		__dynstr_end = .;
+		HIDDEN(__dynstr_start = .);
+		KEEP (*(.dynstr))
+		HIDDEN(__dynstr_end = .);
 	}
-	__dynstr_len = __dynstr_end - __dynstr_start;
+	HIDDEN(__dynstr_len = __dynstr_end - __dynstr_start);

 	.gnu.hash : AT(ADDR(.gnu.hash) + __vma_to_lma) {
-		__gnu_hash_start = .;
-		*(.gnu.hash)
-		__gnu_hash_end = .;
+		HIDDEN(__gnu_hash_start = .);
+		KEEP (*(.gnu.hash))
+		HIDDEN(__gnu_hash_end = .);
 	}


 	.dynlink : AT(ADDR(.dynlink) + __vma_to_lma) {
-		__dynlink_start = .;
-		*(.dynlink)
-		__dynlink_end = .;
+		HIDDEN(__dynlink_start = .);
+		KEEP (*(.dynlink))
+		HIDDEN(__dynlink_end = .);
 	}

 	.got : AT(ADDR(.got) + __vma_to_lma) {
-		__got_start = .;
-		KEEP (*(.got.plt))
+		HIDDEN(__got_start = .);
 		KEEP (*(.got))
-		__got_end = .;
+		KEEP (*(.got.plt))
+		HIDDEN(__got_end = .);
 	}

 	.dynamic : AT(ADDR(.dynamic) + __vma_to_lma) {
-		__dynamic_start = .;
-		*(.dynamic)
-		__dynamic_end = .;
+		HIDDEN(__dynamic_start = .);
+		KEEP (*(.dynamic))
+		HIDDEN(__dynamic_end = .);
 	}

 	.data : AT(ADDR(.data) + __vma_to_lma) {
-		__data_start = .;
+		HIDDEN(__data_start = .);
 		*(.data)
 		*(.data.*)
-		__data_end = .;
+		HIDDEN(__data_end = .);
 	}

-	__pm_code_end = .;
-	__pm_code_len = ABSOLUTE(__pm_code_end) - ABSOLUTE(__pm_code_start);
-	__pm_code_dwords = (__pm_code_len + 3) >> 2;
+	HIDDEN(__pm_code_end = .);
+	HIDDEN(__pm_code_len = ABSOLUTE(__pm_code_end) - ABSOLUTE(__pm_code_start));
+	HIDDEN(__pm_code_dwords = (__pm_code_len + 3) >> 2);

 	. = ALIGN(128);

-	__bss_vma = .;
-	__bss_lma = .;		/* Dummy */
+	HIDDEN(__bss_vma = .);
+	HIDDEN(__bss_lma = ABSOLUTE(.));		/* Dummy */
 	.bss (NOLOAD) : AT (__bss_lma) {
-		__bss_start = .;
+		HIDDEN(__bss_start = .);
 		*(.bss)
 		*(.bss.*)
 		*(COMMON)
-		__bss_end = .;
+		HIDDEN(__bss_end = .);
 	}
-	__bss_len = ABSOLUTE(__bss_end) - ABSOLUTE(__bss_start);
-	__bss_dwords = (__bss_len + 3) >> 2;
+	HIDDEN(__bss_len = ABSOLUTE(__bss_end) - ABSOLUTE(__bss_start));
+	HIDDEN(__bss_dwords = (__bss_len + 3) >> 2);

 	/* Very large objects which don't need to be zeroed */

-	__hugebss_vma = .;
-	__hugebss_lma = .;		/* Dummy */
+	HIDDEN(__hugebss_vma = .);
+	HIDDEN(__hugebss_lma = ABSOLUTE(.));		/* Dummy */
 	.hugebss (NOLOAD) : AT (__hugebss_lma) {
-		__hugebss_start = .;
+		HIDDEN(__hugebss_start = .);
 		*(.hugebss)
 		*(.hugebss.*)
-		__hugebss_end = .;
+		HIDDEN(__hugebss_end = .);
 	}
-	__hugebss_len = ABSOLUTE(__hugebss_end) - ABSOLUTE(__hugebss_start);
-	__hugebss_dwords = (__hugebss_len + 3) >> 2;
+	HIDDEN(__hugebss_len = ABSOLUTE(__hugebss_end) - ABSOLUTE(__hugebss_start));
+	HIDDEN(__hugebss_dwords = (__hugebss_len + 3) >> 2);


 	/* XXX: This stack should be unified with the COM32 stack */
-	__stack_vma = .;
-	__stack_lma = .;	/* Dummy */
+	HIDDEN(__stack_vma = .);
+	HIDDEN(__stack_lma = ABSOLUTE(.));		/* Dummy */
 	.stack (NOLOAD) : AT(__stack_lma) {
-		__stack_start = .;
+		HIDDEN(__stack_start = .);
 		*(.stack)
-		__stack_end = .;
+		HIDDEN(__stack_end = .);
 	}
-	__stack_len = ABSOLUTE(__stack_end) - ABSOLUTE(__stack_start);
-	__stack_dwords = (__stack_len + 3) >> 2;
+	HIDDEN(__stack_len = ABSOLUTE(__stack_end) - ABSOLUTE(__stack_start));
+	HIDDEN(__stack_dwords = (__stack_len + 3) >> 2);

-	_end = .;
+	HIDDEN(_end = .);

 	/* COM32R and kernels are loaded after our own PM code */
 	. = ALIGN(65536);
-	free_high_memory = .;
+	HIDDEN(free_high_memory = .);

 	/* Stuff we don't need... */
 	/DISCARD/ : {
 		*(.eh_frame)
+		*(.interp)
 	}
 }
diff --git a/core/layout.inc b/core/layout.inc
index 53ca783d..635df537 100644
--- a/core/layout.inc
+++ b/core/layout.inc
@@ -139,17 +139,6 @@ serial_buf_size	equ 4096		; Should be a power of 2
 core_xfer_buf	resb 65536

 ;
-; Segment for the real mode code (needed as long as we have a in-kernel
-; loader and/or COM16 support.
-; One symbol for the segment number, one for the absolute address
-;
-		extern	real_mode_seg
-		section .real_mode	write nobits align=65536
-		global	core_real_mode:data hidden
-core_real_mode	resb 65536
-comboot_seg	equ real_mode_seg	; COMBOOT image loading zone
-
-;
 ; At the very end, the lowmem heap
 ;
 		extern __lowmem_heap
--
2.13.3