cba54b205b
- refactor code for transfer buffer reads/writes, real mode int 0x21 calls, and assembler segment declarations - define transfer buffer size in one place - beef up error checking for transfer buffer operations (prevent buffer overflows) - also optimize such operations to transfer dword by dword where feasible
55 lines
972 B
ArmAsm
55 lines
972 B
ArmAsm
#
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! $Source$
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! $State$
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! $Revision$
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#include "libsysasm.h"
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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 eax := 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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!
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! .sys_toolongret: a file name is too long: set `errno' to E2BIG, and return
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! -1.
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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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.extern .sys_toolongret
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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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movzx eax, ax
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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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.sys_toolongret:
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mov (_errno), 7 ! E2BIG
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or eax, -1
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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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