diff options
| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2020-11-20 16:47:38 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-01-07 11:02:03 +0000 |
| commit | 7522a8fe0f7ef91bb3e66d3df1a2786bd4744f9b (patch) | |
| tree | 6365f601165cea08a762561530643b80faf3fe81 /src/arch/x86 | |
| parent | ca965496ffd84d8510961c520aff22bf1cc3a3eb (diff) | |
arch/x86: Move prologue to .init section
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>
Diffstat (limited to 'src/arch/x86')
| -rw-r--r-- | src/arch/x86/bootblock_crt0.S | 2 | ||||
| -rw-r--r-- | src/arch/x86/gdt_init.S | 7 | ||||
| -rw-r--r-- | src/arch/x86/walkcbfs.S | 2 |
3 files changed, 7 insertions, 4 deletions
diff --git a/src/arch/x86/bootblock_crt0.S b/src/arch/x86/bootblock_crt0.S index 82ae97f9c6..387920e38a 100644 --- a/src/arch/x86/bootblock_crt0.S +++ b/src/arch/x86/bootblock_crt0.S @@ -10,7 +10,7 @@ #include <cpu/x86/cr.h> -.section .text._start +.section .init._start, "ax", @progbits /* * Include the old code for reset vector and protected mode entry. That code has diff --git a/src/arch/x86/gdt_init.S b/src/arch/x86/gdt_init.S index 1558ac62c8..f33a1517d8 100644 --- a/src/arch/x86/gdt_init.S +++ b/src/arch/x86/gdt_init.S @@ -1,7 +1,10 @@ /* SPDX-License-Identifier: GPL-2.0-only */ .code32 -.section ".text._gdt_", "ax", @progbits + +.section .init, "ax", @progbits + +.section .init._gdt_, "ax", @progbits .globl gdt_init gdt_init: @@ -17,7 +20,7 @@ gdtptr: #ifdef __x86_64__ .code64 -.section ".text._gdt64_", "ax", @progbits +.section .init._gdt64_, "ax", @progbits .globl gdt_init64 gdt_init64: /* Workaround a bug in the assembler. diff --git a/src/arch/x86/walkcbfs.S b/src/arch/x86/walkcbfs.S index b8d4fb985a..393bcf54ed 100644 --- a/src/arch/x86/walkcbfs.S +++ b/src/arch/x86/walkcbfs.S @@ -21,7 +21,7 @@ #define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4) .code32 -.section .text +.section .init .global walkcbfs_asm /* |