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MIPS: zboot: head.S clean up

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.cprestore is removed as we don't expect Position Independent
zboot ELF.

.noreorder is also removed and rest instructions are massaged
to improve readability.

t9 register is used for indirect jump as MIPS ABI requirement.

start label is removed as it already defined in LEAF.

Reported-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Huacai Chen <chenhuacai@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jiaxun Yang 2020-12-30 11:47:22 +08:00 • committed by Thomas Bogendoerfer
parent cf8194e46c
commit 2ee1503e54
1 changed files with 7 additions and 11 deletions
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18
arch/mips/boot/compressed/head.S
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@ -15,10 +15,7 @@
#include <asm/asm.h> #include <asm/asm.h>
#include <asm/regdef.h> #include <asm/regdef.h>
.set noreorder
.cprestore
LEAF(start) LEAF(start)
start:
/* Save boot rom start args */ /* Save boot rom start args */
move s0, a0 move s0, a0
move s1, a1 move s1, a1
@ -35,21 +32,20 @@ start:
PTR_LA a0, (.heap) /* heap address */ PTR_LA a0, (.heap) /* heap address */
PTR_LA sp, (.stack + 8192) /* stack address */ PTR_LA sp, (.stack + 8192) /* stack address */
PTR_LA ra, 2f PTR_LA t9, decompress_kernel
PTR_LA k0, decompress_kernel jalr t9
jr k0
nop
2: 2:
move a0, s0 move a0, s0
move a1, s1 move a1, s1
move a2, s2 move a2, s2
move a3, s3 move a3, s3
PTR_LI k0, KERNEL_ENTRY PTR_LI t9, KERNEL_ENTRY
jr k0 jalr t9
nop
3: 3:
b 3b b 3b
nop
END(start) END(start)
.comm .heap,BOOT_HEAP_SIZE,4 .comm .heap,BOOT_HEAP_SIZE,4