From 7522a8fe0f7ef91bb3e66d3df1a2786bd4744f9b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ky=C3=B6sti=20M=C3=A4lkki?= <kyosti.malkki@gmail.com>
Date: Fri, 20 Nov 2020 16:47:38 +0200
Subject: arch/x86: Move prologue to .init section
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For arch/x86 the realmode part has to be located within the same 64
KiB as the reset vector. Some older intel platforms also require 4 KiB
alignment for _start16bit.
To enforce the above, and to separate required parts of .text without
matching *(.text.*) rules in linker scripts, tag the pre-C environment
assembly code with section .init directive.
Description of .init section for ELF:
This section holds executable instructions that contribute to the
process initialization code. When a program starts to run, the
system arranges to execute the code in this section before calling the
main program entry point (called main for C programs).
Change-Id: If32518b1c19d08935727330314904b52a246af3c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47599
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
src/lib/program.ld | 3 +++
1 file changed, 3 insertions(+)
(limited to 'src/lib')
diff --git a/src/lib/program.ld b/src/lib/program.ld
index d419ab60b1..3eebd6cc22 100644
--- a/src/lib/program.ld
+++ b/src/lib/program.ld
@@ -13,6 +13,9 @@
.text . : {
_program = .;
_text = .;
+ *(.init._start);
+ *(.init);
+ *(.init.*);
*(.text._start);
*(.text.stage_entry);
KEEP(*(.metadata_hash_anchor));
--
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