118 lines
1.5 KiB
ArmAsm
118 lines
1.5 KiB
ArmAsm
[bits 64]
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[section .text]
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; string input in RSI
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; value in RAX
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; CF set if none, clear if some
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; RSI set past checked area
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dec_parse:
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sub rsp, 24
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mov [rsp+16], rbx
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mov [rsp+8], rdx
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mov [rsp+0], rdi
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xor rax, rax
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xor rdi, rdi
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mov rbx, 10 ; base
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lodsb
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sub al, '0'
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js .no_input
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cmp al, 9
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jle .got_char
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.no_input:
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stc ; set CF
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jmp .done
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.loop:
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xor rax,rax
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lodsb
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sub al, '0'
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js .dec_done
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cmp al, 9
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jg .dec_done
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.got_char:
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xchg rdi,rax
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mul rbx
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add rdi,rax
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jmp .loop
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.dec_done:
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clc ; clear CF
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.done:
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mov rax, rdi
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mov rdi, [rsp+0]
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mov rdx, [rsp+8]
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mov rbx, [rsp+16]
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add rsp, 24
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ret
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; string input in RSI
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; value in RAX
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; CF set if none, cear if some
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; RSI set past checked area
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hex_parse:
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sub rsp, 24
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mov [rsp+16], rbx
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mov [rsp+8], rdx
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mov [rsp+0], rdi
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xor rax, rax
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xor rdi, rdi
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lodsb
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cmp al, '0'
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jb .no_input
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cmp al, '9'
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jbe .got_dec_char
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cmp al, 'A'
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jb .no_input
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cmp al, 'F'
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jbe .got_ualpha_char
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cmp al, 'a'
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jb .no_input
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cmp al, 'f'
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jbe .got_ualpha_char
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.no_input:
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stc ; set CF
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jmp .done
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.loop:
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xor rax,rax
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lodsb
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cmp al, '0'
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jb .hex_done
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cmp al, '9'
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jbe .got_dec_char
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cmp al, 'A'
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jb .hex_done
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cmp al, 'F'
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jbe .got_ualpha_char
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cmp al, 'a'
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jb .hex_done
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cmp al, 'f'
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jbe .got_ualpha_char
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jmp .hex_done
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.got_dec_char:
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sub al, '0'
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xchg rdi,rax
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shl rax, 4
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add rdi,rax
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jmp .loop
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.got_alpha_char:
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sub al, 'A'-10
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xchg rdi,rax
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shl rax, 4
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add rdi,rax
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jmp .loop
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.got_ualpha_char:
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sub al, 'a'-10
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xchg rdi,rax
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shl rax, 4
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add rdi,rax
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jmp .loop
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.hex_done:
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clc ; clear CF
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.done:
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mov rax, rdi
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mov rdi, [rsp+0]
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mov rdx, [rsp+8]
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mov rbx, [rsp+16]
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add rsp, 24
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ret
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; --- MACROS ---
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%define len(x) x %+ .over - x
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