109 lines
1.4 KiB
ArmAsm
109 lines
1.4 KiB
ArmAsm
global ft_list_remove_if
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extern free
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section .text
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;this function remove an element from a list, set the previous element to the next
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; the element to remove is in rax
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; the previouse element is in r8
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; the pointer to the start of the list is in rdi
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remove_element:
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push rsi
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mov rsi, [rax + 8] ; save cur->next in rsi
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call call_free_elem
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test r8, r8
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jz .first_elem ;if it's the first element, skip setting prev
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mov [r8 + 8], rsi ; prev->next = rsi
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jmp .remove_element_end
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.first_elem:
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mov [rdi], rsi ;set list start to rsi
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.remove_element_end:
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mov rax, rsi ; set cur element to rsi;
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pop rsi
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ret
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;wants the element that needs to be freed in rax
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call_free_elem:
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push rdi
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push rsi
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push rdx
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push rcx
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push r8
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push rax
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mov rdi, [rax]
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sub rsp, 8
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call rcx ; call remove
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add rsp, 8
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pop rdi
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call free wrt ..plt
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pop r8
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pop rcx
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pop rdx
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pop rsi
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pop rdi
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ret
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ft_list_remove_if:
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test rdi, rdi
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jz .end
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test rdx, rdx
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jz .end
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test rcx, rcx
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jz .end
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xor r8, r8
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mov rax, [rdi]
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.loop:
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test rax, rax
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jz .end
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push rax
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push rdi
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push rsi
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push rdx
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push rcx
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push r8
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mov rdi, [rax]
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sub rsp, 8
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call rdx
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add rsp, 8
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test eax, eax
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pop r8
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pop rcx
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pop rdx
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pop rsi
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pop rdi
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jnz .loop_end ;if call to rdx returned zero, don't remove
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pop rax
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sub rsp, 8
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call remove_element
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add rsp, 8
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jmp .loop
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.loop_end:
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pop rax
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mov r8, rax
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mov rax, [rax + 8]
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jmp .loop
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.end:
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ret
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