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fix allocator

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PoliEcho 2025-07-08 10:00:24 +02:00
parent a2a5b4c972
commit 35a6894d9f
1 changed files with 4 additions and 3 deletions
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7
src/alloc.asm
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@ -7,7 +7,7 @@ section .text
global init_alloc
init_alloc:; initialize allocator, optionaly return brk pointer in rax
mov rax, SYS_BRK
mov rdi, 0
xor rdi, rdi
syscall
mov [brk_pointer], rax
ret
@ -15,9 +15,10 @@ init_alloc:; initialize allocator, optionaly return brk pointer in rax
global alloc
alloc:; Takes lenght of data in rdi and returns pointer in rax
mov rax, SYS_BRK
mov rcx, [brk_pointer]
mov qword rcx, [brk_pointer]
add rdi, rcx; calculate new BRK address
push rcx
syscall; size already in rdi
syscall
mov [brk_pointer], rax
pop rax
ret