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don't touch registers used by calling convention

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wires 2025-04-19 14:17:07 -04:00
parent b6b96f651f
commit dff5765407
Signed by: wires
SSH key fingerprint: SHA256:9GtP+M3O2IivPDlw1UY872UPUuJH2gI0yG6ExBxaaiM
1 changed files with 10 additions and 10 deletions
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20
src/startup.s
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@ -2,25 +2,25 @@
.global _start .global _start
_start: _start:
mrs x1, MPIDR_EL1 mrs x4, MPIDR_EL1
and x1, x1, 0b11 and x4, x1, 0b11
cbz x1, init cbz x4, init
halt: halt:
wfe wfe
b halt b halt
init: init:
adr x1, __stack_base adr x4, __stack_base
mov sp, x1 mov sp, x4
adr x1, __bss_start adr x4, __bss_start
adr x2, __bss_size adr x5, __bss_size
cbz x2, exec_kernel cbz x5, exec_kernel
clear_bss: clear_bss:
str xzr, [x1], 8 str xzr, [x4], 8
sub x2, x2, 1 sub x5, x2, 1
cbnz w2, clear_bss cbnz w2, clear_bss
exec_kernel: exec_kernel: