diff options
| author | Stephen Warren <swarren@nvidia.com> | 2017-11-02 18:11:27 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2017-11-17 07:44:13 -0500 |
| commit | 49e93875a62fb9e96a4a7483b9bd5d8ae27ea76e (patch) | |
| tree | 8daa16b3ccae7e5fa772f32e9b2f0b76d532f17e /arch/arm/lib/crt0_64.S | |
| parent | 9679d339ad2d4c495d734bad3a0fb7be6c4215eb (diff) | |
arm64: support running at addr other than linked to
This is required in the case where U-Boot is typically loaded and run at
a particular address, but for some reason the RAM at that location is not
available, e.g. due to memory fragmentation loading other boot binaries or
firmware, splitting an SMP complex between various different OSs without
using e.g. the EL2 second-stage page tables to hide the memory asignments,
or due to known ECC failures.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/lib/crt0_64.S')
| -rw-r--r-- | arch/arm/lib/crt0_64.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S index 9c46c93ca4..da7c62cbe0 100644 --- a/arch/arm/lib/crt0_64.S +++ b/arch/arm/lib/crt0_64.S @@ -98,6 +98,14 @@ ENTRY(_main) ldr x18, [x18, #GD_NEW_GD] /* x18 <- gd->new_gd */ adr lr, relocation_return +#if CONFIG_POSITION_INDEPENDENT + /* Add in link-vs-runtime offset */ + adr x0, _start /* x0 <- Runtime value of _start */ + ldr x9, _TEXT_BASE /* x9 <- Linked value of _start */ + sub x9, x9, x0 /* x9 <- Run-vs-link offset */ + add lr, lr, x9 +#endif + /* Add in link-vs-relocation offset */ ldr x9, [x18, #GD_RELOC_OFF] /* x9 <- gd->reloc_off */ add lr, lr, x9 /* new return address after relocation */ ldr x0, [x18, #GD_RELOCADDR] /* x0 <- gd->relocaddr */ |