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11eb1a4179
stringss.inc, used by the assembler routines (they are already defined in the system unit, but these includes are included in units, other than system) git-svn-id: trunk@31922 -
88 lines
2.7 KiB
PHP
88 lines
2.7 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2000 by Jonas Maebe, member of the
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Free Pascal development team
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Processor dependent part of strings.pp, not shared with
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sysutils unit.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{$if defined(FPC_MM_TINY)}
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{$define FPC_X86_CODE_NEAR}
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{$define FPC_X86_DATA_NEAR}
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{$elseif defined(FPC_MM_SMALL)}
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{$define FPC_X86_CODE_NEAR}
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{$define FPC_X86_DATA_NEAR}
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{$elseif defined(FPC_MM_MEDIUM)}
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{$define FPC_X86_CODE_FAR}
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{$define FPC_X86_DATA_NEAR}
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{$elseif defined(FPC_MM_COMPACT)}
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{$define FPC_X86_CODE_NEAR}
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{$define FPC_X86_DATA_FAR}
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{$elseif defined(FPC_MM_LARGE)}
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{$define FPC_X86_CODE_FAR}
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{$define FPC_X86_DATA_FAR}
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{$elseif defined(FPC_MM_HUGE)}
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{$define FPC_X86_CODE_FAR}
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{$define FPC_X86_DATA_HUGE}
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{$else}
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{$fatal No memory model defined}
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{$endif}
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{$ifndef FPC_UNIT_HAS_STRPCOPY}
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{$define FPC_UNIT_HAS_STRPCOPY}
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function strpcopy(d : pchar;const s : string) : pchar;assembler;nostackframe;
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const
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{ used for an offset fixup for accessing the proc parameters in asm routines
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that use nostackframe. We can't use the parameter name directly, because
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i8086 doesn't support sp relative addressing. }
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{$ifdef FPC_X86_CODE_FAR}
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extra_param_offset = 2;
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{$else FPC_X86_CODE_FAR}
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extra_param_offset = 0;
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{$endif FPC_X86_CODE_FAR}
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asm
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mov bx, sp
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mov dx, ds // for far data models, backup ds; for near data models, use to initialize es
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{$ifdef FPC_X86_DATA_NEAR}
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mov es, dx
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mov si, ss:[bx + 2 + extra_param_offset] // @s
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mov di, ss:[bx + 4 + extra_param_offset] // @d
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{$else FPC_X86_DATA_NEAR}
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lds si, ss:[bx + 2 + extra_param_offset] // @s
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les di, ss:[bx + 6 + extra_param_offset] // @d
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{$endif FPC_X86_DATA_NEAR}
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// we will no longer use bx for reading parameters, so save di there
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// in order to be able to return it in the end
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mov bx, di
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{$ifdef FPC_ENABLED_CLD}
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cld
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{$endif FPC_ENABLED_CLD}
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lodsb // load length in al
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xor ah, ah
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xchg cx, ax // 1 byte shorter than mov
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shr cx, 1
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rep movsw
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adc cx, cx
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rep movsb
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xchg ax, cx // ax := 0 (1 byte shorter than xor al, al)
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stosb // zero terminate the destination string
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{$if defined(FPC_X86_DATA_FAR) or defined(FPC_X86_DATA_HUGE)}
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mov ds, dx
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mov dx, es // return segment of d in dx
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{$endif}
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xchg ax, bx // return original offset of d in ax
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end;
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{$endif FPC_UNIT_HAS_STRPCOPY}
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