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Fixing bugs

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This commit is contained in:
plutoo 2017-09-09 03:33:38 +02:00
parent b2dcf4e405
commit a35cdc698b
1 changed files with 22 additions and 18 deletions
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40
crt0/switch_crt0.s
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@ -1,7 +1,8 @@
.section ".crt0","ax" .section ".crt0","ax"
.global _start, _sysexit, main .global _start, _sysexit, main
_start: _start:
bl startup bl startup
.word 0x454d4f48 .word 0x454d4f48
.word 0x57455242 .word 0x57455242
@ -11,12 +12,13 @@ startup:
sub x30, x30, #4 sub x30, x30, #4
// clear .bss // clear .bss
ldr x0, =__bss_start__ ldr x0, =__bss_start__
ldr x1, =__bss_end__ ldr x1, =__bss_end__
sub x1, x1, x0 sub x1, x1, x0 // calculate size
add x1, x1, #7 add x1, x1, #7 // round up to 8
bic x1, x1, #7 bic x1, x1, #7
mov x2, #0 mov x2, #0
add x0, x0, x30 // relocate ptr
bss_loop: bss_loop:
str x2, [x0], #8 str x2, [x0], #8
@ -24,24 +26,26 @@ bss_loop:
bne bss_loop bne bss_loop
// relocate .got // relocate .got
ldr x0, =__got_start__ ldr x0, =__got_start__
ldr x1, =__got_end__ ldr x1, =__got_end__
sub x1, x1, x0 sub x1, x1, x0 // calculate size
add x1, x1, #3 add x1, x1, #3 // round up to 4
bic x1, x1, #3 bic x1, x1, #3
add x0, x0, x30 // relocate ptr
got_loop: got_loop:
ldr x2, [x0] ldr x2, [x0]
add x2, x2, x30 ldr x3, [x2]
str x2, [x0], #8 add x3, x3, x30
str x3, [x2], #8
subs x1, x1, #8 subs x1, x1, #8
bne got_loop bne got_loop
mov x0, #0 // argc mov x0, #0 // argc
mov x1, #0 // argv mov x1, #0 // argv
ldr x3, =main ldr x3, =main
blr x3 blr x3
_sysexit: _sysexit:
svc 0x7 svc 0x7