diff options
| author | Michal Simek <michal.simek@amd.com> | 2022-06-24 14:15:01 +0200 |
|---|---|---|
| committer | Michal Simek <michal.simek@amd.com> | 2022-06-24 14:15:01 +0200 |
| commit | d58c007498258b73d9eb5e3b24973578498fc341 (patch) | |
| tree | d3d54223dd11fcbd2db4dfdb2715a9dda4aa7f62 /arch/microblaze/Kconfig | |
| parent | 034944b33bc8dd42dd90f9d043c5c03cc0036f01 (diff) | |
microblaze: Add support for run time relocation
Microblaze is using NEEDS_MANUAL_RELOC from the beginnging. This is causing
issues with function pointer arrays which need to be updated manually after
relocation. Building code with -fPIC and linking with -pic will remove this
limitation and there is no longer need to run manual update.
By default still old option is enabled but by disabling NEEDS_MANUAL_RELOC
code will be compiled for full relocation.
The patch does couple of things which are connected to each other.
- Define STATIC_RELA dependency to call relocate-rela to fill sections.
- REMAKE_ELF was already enabled but u-boot file can't be used because
sections are empty. relocate-rela will fill them and output file is
u-boot.elf which should be used.
- Add support for full relocation (u-boot.elf)
- Add support for early relocation when u-boot.bin is loaded to different
address then CONFIG_SYS_TEXT_BASE
- Add rela.dyn and dynsym sections
Disabling NEEDS_MANUAL_RELOC U-Boot size increased by 10% of it's original
size (550kB to 608kB).
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/a845670b34925859b2e321875f7588a29f6655f9.1655299267.git.michal.simek@amd.com
Diffstat (limited to 'arch/microblaze/Kconfig')
| -rw-r--r-- | arch/microblaze/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index d7d1b219704..6f45d19330a 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -4,6 +4,20 @@ menu "MicroBlaze architecture" config SYS_ARCH default "microblaze" +config NEEDS_MANUAL_RELOC + bool "Disable position-independent pre-relocation code" + default y + help + U-Boot expects to be linked to a specific hard-coded address, and to + be loaded to and run from that address. This option lifts that + restriction, thus allowing the code to be loaded to and executed from + almost any 4K aligned address. This logic relies on the relocation + information that is embedded in the binary to support U-Boot + relocating itself to the top-of-RAM later during execution. + +config STATIC_RELA + def_bool y if !NEEDS_MANUAL_RELOC + choice prompt "Target select" optional |