15955282f6
- ensure es = ds = ss upon exit of each C runtime function - clear upper 16 bits of ebx before setting them to 0x0021, when invoking interrupt_ptr to simulate a RM int 0x21 - make _sys_exists use the transfer buffer (which it needs) - make _sys_rawread properly handle an end-of-file read (zero bytes read) - make argument to _sys_seterrno short --- after a failed int 0x21 call, only the lower 16 bits of eax hold the MS-DOs error code - _sys_rawlseek accepts only 3 longword arguments, not 4 (the offset is only 1 longword) - other minor fixes
26 lines
338 B
ArmAsm
26 lines
338 B
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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! Say whether a given file descriptor number refers to a valid open file
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! descriptor.
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.define __sys_isopen
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__sys_isopen:
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mov ebx, 4(esp)
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mov eax, 0x4400
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int 0x21
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sbb eax, eax
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inc eax
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ret
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