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124 lines
2.9 KiB
ObjectPascal
124 lines
2.9 KiB
ObjectPascal
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2017 by the Free Pascal development team
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System Entry point for PalmOS, Pascal only programs
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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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{$SMARTLINK OFF}
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unit si_prc;
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interface
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implementation
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{$i palmos.inc}
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var
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appInfo: SysAppInfoPtr; public name '__appInfo';
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StkLen: LongInt; external name '__stklen';
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sysinit_jmpbuf: jmp_buf;
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ExitCode: LongInt;
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var
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{ this is declared by the PalmOS linker script }
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data_start: pbyte; external name 'data_start';
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procedure PascalMain; external name 'PASCALMAIN';
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procedure FPCRelocateData; forward;
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{ this function must be the first in this unit which contains code }
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function _FPC_proc_start: longint; cdecl; public name '_start';
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var
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locAppInfo: SysAppInfoPtr;
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prevGlobals: Pointer;
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globalsPtr: Pointer;
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begin
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_FPC_proc_start:=0;
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if SysAppStartup(locAppInfo, prevGlobals, globalsPtr) <> 0 then
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begin
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SndPlaySystemSound(sndError);
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exit(-1);
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end;
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if (locAppInfo^.launchFlags and sysAppLaunchFlagNewGlobals) > 0 then
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FPCRelocateData;
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{ we don't support anything but normal startup now }
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{ FIXME: figure it out how various startup commands can }
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{ coexist with the normal system unit infrastructure (KB) }
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if locAppInfo^.cmd = sysAppLaunchCmdNormalLaunch then
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begin
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if setjmp(sysinit_jmpbuf) = 0 then
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begin
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appInfo:=locAppInfo;
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PascalMain;
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end;
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_FPC_proc_start:=ExitCode;
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end;
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SysAppExit(locAppInfo, prevGlobals, globalsPtr);
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end;
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procedure _FPC_proc_halt(_ExitCode: longint); cdecl; public name '_haltproc';
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begin
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ExitCode:=_ExitCode;
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longjmp(sysinit_jmpbuf,1);
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end;
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{ data segment relocation magic, ported to Pascal from prc-tools C version }
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type
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PReloc = ^TReloc;
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TReloc = record
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case boolean of
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true: ( next: smallint; addend: word );
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false: ( value: dword );
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end;
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procedure RelocateChain(offset: smallint; base: pointer);
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var
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data_res: pbyte;
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site: PReloc;
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begin
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data_res:=@data_start;
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while offset >= 0 do
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begin
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site:=PReloc(data_res + offset);
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offset:=site^.next;
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site^.next:=0;
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site^.value:=site^.value + PtrUInt(base);
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end;
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end;
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procedure FPCRelocateData;
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var
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relocH: MemHandle;
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chain: psmallint;
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const
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rloc_id = $726c6f63; // 'rloc'
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begin
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relocH:=DmGet1Resource(rloc_id, 0);
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if relocH <> nil then
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begin
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chain:=MemHandleLock(relocH);
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RelocateChain(chain^, @data_start);
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Inc(chain);
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RelocateChain(chain^, @_FPC_proc_start);
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Inc(chain);
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MemHandleUnlock(relocH);
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DmReleaseResource(relocH);
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end;
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end;
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end.
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