The remaining contents of LC0 are only used after the point in the
decompressor startup code where we enter via 'wont_overwrite'. So
move the loading of the LC0 structure after it. This will allow us
to jump to wont_overwrite directly from the EFI stub, and execute
the decompressor in place at the offset it was loaded by the UEFI
firmware.
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Reviewed-by: Nicolas Pitre <nico@xxxxxxxxxxx>
---
arch/arm/boot/compressed/head.S | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 5d712e2c0001..ce442ec5028a 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -299,10 +299,6 @@ restart: adr r0, LC1
add sp, sp, r0
add r6, r6, r0
- adr r0, LC0
- ldmia r0, {r1, r2, r3, r11, r12}
- sub r0, r0, r1 @ calculate the delta offset
-
get_inflated_image_size r9, r10, lr
#ifndef CONFIG_ZBOOT_ROM
@@ -320,9 +316,6 @@ restart: adr r0, LC1
mov r5, #0 @ init dtb size to 0
#ifdef CONFIG_ARM_APPENDED_DTB
/*
- * r0 = delta
- * r2 = BSS start
- * r3 = BSS end
* r4 = final kernel address (possibly with LSB set)
* r5 = appended dtb size (still unknown)
* r6 = _edata
@@ -330,8 +323,6 @@ restart: adr r0, LC1
* r8 = atags/device tree pointer
* r9 = size of decompressed image
* r10 = end of this image, including bss/stack/malloc space if non XIP
- * r11 = GOT start
- * r12 = GOT end
* sp = stack pointer
*
* if there are device trees (dtb) appended to zImage, advance r10 so that the
@@ -379,7 +370,6 @@ restart: adr r0, LC1
/* temporarily relocate the stack past the DTB work space */
add sp, sp, r5
- stmfd sp!, {r0-r3, ip, lr}
mov r0, r8
mov r1, r6
mov r2, r5
@@ -398,7 +388,6 @@ restart: adr r0, LC1
mov r2, r5
bleq atags_to_fdt
- ldmfd sp!, {r0-r3, ip, lr}
sub sp, sp, r5
#endif
@@ -535,6 +524,10 @@ dtb_check_done:
mov pc, r0
wont_overwrite:
+ adr r0, LC0
+ ldmia r0, {r1, r2, r3, r11, r12}
+ sub r0, r0, r1 @ calculate the delta offset
+
/*
* If delta is zero, we are running at the address we were linked at.
* r0 = delta
--
2.17.1
