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{
This file is part of the Free Pascal run time library.
Copyright (c) 2001 by Free Pascal development team
This file implements all the base types and limits required
for a minimal POSIX compliant subset required to port the compiler
to a new OS.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{****************************************************************************
Heap management releated routines.
****************************************************************************}
{ this function allows to extend the heap by calling
syscall $7f00 resizes the brk area}
function sbrk(size:longint):pointer;
{$IFDEF DUMPGROW}
var
L: longword;
begin
WriteLn ('Trying to grow heap by ', Size);
{$IFDEF CONTHEAP}
WriteLn ('BrkLimit is ', BrkLimit);
{$ENDIF CONTHEAP}
asm
movl size,%edx
movw $0x7f00,%ax
call syscall { result directly in EAX }
inc %eax { Result in EAX, -1 = error (has to be transformed to 0) }
jz .LSbrk_End
dec %eax { No error - back to previous value }
.LSbrk_End:
mov %eax,L
end ['eax', 'edx'];
WriteLn ('New heap at ', L);
Sbrk := pointer (L);
end;
{$ELSE DUMPGROW}
assembler;
asm
{$IFDEF REGCALL}
movl %eax,%edx
{$ELSE REGCALL}
movl size,%edx
{$ENDIF REGCALL}
movw $0x7f00,%ax
call syscall
inc %eax { Result in EAX, -1 = error (has to be transformed to 0) }
jz .LSbrk_End
dec %eax { No error - back to previous value }
.LSbrk_End:
end {['eax', 'edx']};
{$ENDIF DUMPGROW}
function SysOSAlloc (Size: ptruint): pointer;
begin
SysOSAlloc := Sbrk (Size);
end;
{.$define HAS_SYSOSFREE}
procedure SysOSFree (P: pointer; Size: ptruint);
begin
end;
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