From: Michal Simek Date: Fri, 24 Jun 2022 12:15:00 +0000 (+0200) Subject: microblaze: Optimize register usage in relocate_code X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=3041b512ebed13e29144cf5b9524e714c4aa458e;p=u-boot.git microblaze: Optimize register usage in relocate_code There are additional operations which can be done simpler that's why improve logic around relocation address r7 handling and _start symbol. Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/c8b60f72f1605c2ba6b4b7be1893d7e6ec3d8597.1655299267.git.michal.simek@amd.com --- diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S index 2aae4a0b7c..f2d6d12deb 100644 --- a/arch/microblaze/cpu/start.S +++ b/arch/microblaze/cpu/start.S @@ -271,7 +271,6 @@ relocate_code: mts rshr, r1 addi r31, r6, 0 /* Start to use new GD */ - add r23, r0, r7 /* Move reloc addr to r23 */ /* Relocate text and data - r12 temp value */ addi r21, r0, _start addi r22, r0, _end /* Include BSS too */ @@ -280,15 +279,13 @@ relocate_code: rsub r6, r21, r22 or r5, r0, r0 1: lw r12, r21, r5 /* Load u-boot data */ - sw r12, r23, r5 /* Write zero to loc */ + sw r12, r7, r5 /* Write zero to loc */ cmp r12, r5, r6 /* Check if we have reach the end */ bneid r12, 1b addi r5, r5, 4 /* Increment to next loc - relocate code */ /* R23 points to the base address. */ - add r23, r0, r7 /* Move reloc addr to r23 */ - addi r24, r0, _start /* Get reloc offset */ - rsub r23, r24, r23 /* keep - this is already here gd->reloc_off */ + rsub r23, r21, r7 /* keep - this is already here gd->reloc_off */ /* Setup vectors with post-relocation symbols */ add r5, r0, r23 /* load gd->reloc_off to r5 */