20 lines
493 B
ArmAsm
20 lines
493 B
ArmAsm
global ft_read
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extern __errno_location
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ft_read:
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mov rax, 0 ; syscall read, other arguments should be good accord to calling convention
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syscall
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cmp eax, -1 ; linux syscalls errors are always in the range -4095 to -1
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jg .done
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cmp eax, -4095
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jl .done
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mov rcx, rax ; save return value of syscall
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call __errno_location WRT ..plt; put address of errno in rax
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neg rcx ; errno should be positive
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mov [rax], rcx ; set errno
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mov rax, -1 ; set return value of ft_read to -1
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ret
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.done:
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ret
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