diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2020-04-13 19:21:33 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-05-19 19:23:22 +0300 |
| commit | f1f012b033e6651cd5c5b43d1722976cf6baf973 (patch) | |
| tree | 1542a400e4828981caac3c15f9a40ff279b5284a /arch/arm/boot/compressed | |
| parent | 161e04a5bae58a65d2b13642845f250888a845a1 (diff) | |
| download | linux-f1f012b033e6651cd5c5b43d1722976cf6baf973.tar.xz | |
ARM: decompressor: defer loading of the contents of the LC0 structure
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@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'arch/arm/boot/compressed')
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 15 |
1 files 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 |