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
52 lines
861 B
ArmAsm
52 lines
861 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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! .sys_zret: if the carry flag is set, then set `errno' from the DOS error
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! code in ax, and return an int -1. If the carry flag is clear, just
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! return an int zero.
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!
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! .sys_axret: if the carry flag is set, then set `errno' from the DOS error
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! code in ax, and return a shortword -1. If the carry flag is clear, just
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! return ax as a return value.
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!
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! .sys_dxaxret: same as .sys_axret, but return -1 or eax := dx:ax as a
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! return value.
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.extern .sys_zret
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.extern .sys_axret
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.extern .sys_dxaxret
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.sys_zret:
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jc error
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xor eax, eax
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no_error:
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ret
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.sys_axret:
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jc error
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ret
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.sys_dxaxret:
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jc error
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shl edx, 16
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o16 mov dx, ax
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mov eax, edx
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ret
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error:
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movzx eax, ax
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push eax
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call __sys_seterrno
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pop ecx
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ret
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