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Fix endianness.asm #97

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Fix endianness.asm #97

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52 changes: 25 additions & 27 deletions listings/chap2/endianness/endianness.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,12 @@ section .data

newline_char: db 10
codes: db '0123456789abcdef'
global _start


demo1: dq 0x1122334455667788
demo2: db 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88

global _start
section .text

print_newline:
mov rax, 1
Expand All @@ -18,42 +22,36 @@ print_newline:
print_hex:
mov rax, rdi

mov rcx, 64
iterate:
push rax
sub rcx, 4
sar rax, cl
and rax, 0xf
lea rsi, [codes + rax]
mov rax, 1

push rcx
mov rdi, 1
mov rdx, 1
syscall
pop rcx
mov rcx, 64
iterate:
push rax
sub rcx, 4
sar rax, cl
and rax, 0xf
lea rsi, [codes + rax]
mov rax, 1

push rcx
mov rdi, 1
mov rdx, 1
syscall
pop rcx

pop rax
test rcx, rcx
jnz iterate

ret
jnz iterate

section .data
demo1: dq 0x1122334455667788
demo2: db 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88

section .text
ret

_start:
mov rdi, [demo1]
call print_hex
call print_newline

mov rdi, [demo2]
call print_hex
call print_newline

mov rax, 60
xor rdi, rdi
syscall