67 lines
1.1 KiB
ArmAsm
67 lines
1.1 KiB
ArmAsm
#
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! $Source$
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! $State$
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! $Revision$
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! Declare segments (the order is important).
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! Write bytes to/to a file descriptor. These routines do not do any
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! translation between CRLF and LF line endings.
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!
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! Note that, for MS-DOS, a raw "write" request of zero bytes will truncate
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! (or extend) the file to the current file position.
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.define __sys_rawwrite
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__sys_rawwrite:
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enter 0, 0
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push esi
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push edi
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file_handle = 2*4
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read_buffer = 3*4
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amount_to_write = 4*4
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mov eax, amount_to_write(ebp)
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mov ecx, 32*1024 ! size of transfer buffer
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cmp eax, ecx
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jge 2f
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mov ecx, eax
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2:
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! Copy ecx bytes into the transfer buffer.
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push ecx
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mov esi, read_buffer(ebp)
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movzx edi, (transfer_buffer_ptr)
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mov es, (pmode_ds)
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cld
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rep movsb
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pop ecx
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! Write from the transfer buffer to DOS.
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movb ah, 0x40
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o16 mov dx, (transfer_buffer_ptr)
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o16 mov bx, file_handle(ebp)
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or ebx, 0x210000
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callf (interrupt_ptr)
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jnc exit
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push eax
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call __sys_seterrno
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pop ecx
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exit:
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pop edi
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pop esi
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leave
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ret
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! vim: sw=4 ts=4 et
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