mirror of
https://gitlab.com/freepascal.org/fpc/source.git
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565 lines
12 KiB
PHP
565 lines
12 KiB
PHP
{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2000 by Michael Van Canneyt,
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member of the Free Pascal development team.
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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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{No debugging for syslinux include !}
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{$IFDEF SYS_LINUX}
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{$UNDEF SYSCALL_DEBUG}
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{$ENDIF SYS_LINUX}
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{*****************************************************************************
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--- Main:The System Call Self ---
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*****************************************************************************}
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Procedure Do_SysCall( callnr:longint;var regs : SysCallregs );assembler;
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{
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This function puts the registers in place, does the call, and then
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copies back the registers as they are after the SysCall.
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}
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{$ifdef i386}
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{$ASMMODE ATT}
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asm
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{ load the registers... }
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movl 12(%ebp),%eax
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movl 4(%eax),%ebx
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movl 8(%eax),%ecx
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movl 12(%eax),%edx
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movl 16(%eax),%esi
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movl 20(%eax),%edi
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{ set the call number }
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movl 8(%ebp),%eax
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{ Go ! }
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int $0x80
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{ Put back the registers... }
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pushl %eax
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movl 12(%ebp),%eax
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movl %edi,20(%eax)
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movl %esi,16(%eax)
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movl %edx,12(%eax)
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movl %ecx,8(%eax)
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movl %ebx,4(%eax)
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popl %ebx
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movl %ebx,(%eax)
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end;
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{$ASMMODE DEFAULT}
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{$else}
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{$ifdef m68k}
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asm
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{ load the registers... }
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move.l 12(a6),a0
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move.l 4(a0),d1
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move.l 8(a0),d2
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move.l 12(a0),d3
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move.l 16(a0),d4
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move.l 20(a0),d5
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{ set the call number }
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move.l 8(a6),d0
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{ Go ! }
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trap #0
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{ Put back the registers... }
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move.l d0,-(sp)
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move.l 12(a6),a0
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move.l d5,20(a0)
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move.l d4,16(a0)
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move.l d3,12(a0)
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move.l d2,8(a0)
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move.l d1,4(a0)
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move.l (sp)+,d1
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move.l d1,(a0)
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end;
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{$else}
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{$error Cannot decide which processor you have ! define i386 or m68k }
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{$endif}
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{$endif}
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{$IFDEF SYSCALL_DEBUG}
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Const
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DoSysCallDebug : Boolean = False;
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var
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LastCnt,
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LastEax,
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LastCall : longint;
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DebugTxt : string[20];
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{$ENDIF}
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Function SysCall( callnr:longint;var regs : SysCallregs ):longint;
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{
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This function serves as an interface to do_SysCall.
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If the SysCall returned a negative number, it returns -1, and puts the
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SysCall result in errno. Otherwise, it returns the SysCall return value
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}
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begin
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do_SysCall(callnr,regs);
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if regs.reg1<0 then
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begin
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{$IFDEF SYSCALL_DEBUG}
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If DoSysCallDebug then
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debugtxt:=' syscall error: ';
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{$endif}
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ErrNo:=-regs.reg1;
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SysCall:=-1;
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end
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else
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begin
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{$IFDEF SYSCALL_DEBUG}
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if DoSysCallDebug then
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debugtxt:=' syscall returned: ';
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{$endif}
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SysCall:=regs.reg1;
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errno:=0
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end;
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{$IFDEF SYSCALL_DEBUG}
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if DoSysCallDebug then
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begin
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inc(lastcnt);
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if (callnr<>lastcall) or (regs.reg1<>lasteax) then
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begin
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if lastcnt>1 then
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writeln(sys_nr_txt[lastcall],debugtxt,lasteax,' (',lastcnt,'x)');
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lastcall:=callnr;
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lasteax:=regs.reg1;
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lastcnt:=0;
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writeln(sys_nr_txt[lastcall],debugtxt,lasteax);
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end;
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end;
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{$endif}
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end;
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Function Sys_Time:longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=0;
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Sys_Time:=SysCall(SysCall_nr_time,regs);
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end;
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{*****************************************************************************
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--- File:File handling related calls ---
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*****************************************************************************}
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Function Sys_Open(f:pchar;flags:longint;mode:integer):longint;
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var
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regs : SysCallregs;
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Begin
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regs.reg2:=longint(f);
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regs.reg3:=flags;
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regs.reg4:=mode;
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Sys_Open:=SysCall(SysCall_nr_open,regs);
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End;
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Function Sys_Close(f:longint):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=f;
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Sys_Close:=SysCall(SysCall_nr_close,regs);
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end;
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Function Sys_Lseek(F:longint;Off:longint;Whence:longint):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=f;
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regs.reg3:=off;
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regs.reg4:=Whence;
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Sys_lseek:=SysCall(SysCall_nr_lseek,regs);
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end;
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Function Sys_Read(f:longint;buffer:pchar;count:longint):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=f;
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regs.reg3:=longint(buffer);
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regs.reg4:=count;
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Sys_Read:=SysCall(SysCall_nr_read,regs);
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end;
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Function Sys_Write(f:longint;buffer:pchar;count:longint):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=f;
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regs.reg3:=longint(buffer);
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regs.reg4:=count;
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Sys_Write:=SysCall(SysCall_nr_write,regs);
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end;
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Function Sys_Unlink(Filename:pchar):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(filename);
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Sys_Unlink:=SysCall(SysCall_nr_unlink,regs);
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end;
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Function Sys_fstat(fd : longint;var Info:stat):Longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=fd;
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regs.reg3:=longint(@Info);
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Sys_fStat:=SysCall(SysCall_nr_fstat,regs);
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end;
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Function Sys_Rename(Oldname,Newname:pchar):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(oldname);
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regs.reg3:=longint(newname);
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Sys_Rename:=SysCall(SysCall_nr_rename,regs);
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end;
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Function Sys_Stat(Filename:pchar;var Buffer: stat):longint;
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{
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We need this for getcwd
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}
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(filename);
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regs.reg3:=longint(@buffer);
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Sys_Stat:=SysCall(SysCall_nr_stat,regs);
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end;
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Function Sys_Symlink(oldname,newname:pchar):longint;
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{
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We need this for erase
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}
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(oldname);
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regs.reg3:=longint(newname);
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Sys_symlink:=SysCall(SysCall_nr_symlink,regs);
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end;
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Function Sys_ReadLink(name,linkname:pchar;maxlen:longint):longint;
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var
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regs : SysCallRegs;
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begin
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regs.reg2:=longint(name);
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regs.reg3:=longint(linkname);
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regs.reg4:=maxlen;
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Sys_ReadLink:=SysCall(Syscall_nr_readlink,regs);
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end;
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{*****************************************************************************
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--- Directory:Directory related calls ---
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*****************************************************************************}
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Function Sys_Chdir(Filename:pchar):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(filename);
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Sys_ChDir:=SysCall(SysCall_nr_chdir,regs);
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end;
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Function Sys_Mkdir(Filename:pchar;mode:longint):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(filename);
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regs.reg3:=mode;
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Sys_MkDir:=SysCall(SysCall_nr_mkdir,regs);
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end;
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Function Sys_Rmdir(Filename:pchar):longint;
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var
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regs : SysCallregs;
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begin
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regs.reg2:=longint(filename);
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Sys_Rmdir:=SysCall(SysCall_nr_rmdir,regs);
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end;
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{ we need this for getcwd }
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Function OpenDir(f:pchar):pdir;
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var
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fd:integer;
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st:stat;
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ptr:pdir;
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begin
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opendir:=nil;
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if sys_stat(f,st)<0 then
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exit;
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{ Is it a dir ? }
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if not((st.mode and $f000)=$4000)then
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begin
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errno:=sys_enotdir;
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exit
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end;
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{ Open it}
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fd:=sys_open(f,OPEN_RDONLY,438);
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if fd<0 then
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exit;
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new(ptr);
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if ptr=nil then
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exit;
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new(ptr^.buf);
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if ptr^.buf=nil then
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exit;
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ptr^.fd:=fd;
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ptr^.loc:=0;
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ptr^.size:=0;
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ptr^.dd_max:=sizeof(ptr^.buf^);
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opendir:=ptr;
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end;
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function CloseDir(p:pdir):integer;
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begin
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closedir:=sys_close(p^.fd);
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dispose(p^.buf);
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dispose(p);
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end;
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Function Sys_ReadDir(p:pdir):pdirent;
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var
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regs :SysCallregs;
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dummy:longint;
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begin
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regs.reg3:=longint(p^.buf);
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regs.reg2:=p^.fd;
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regs.reg4:=1;
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dummy:=SysCall(SysCall_nr_readdir,regs);
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{ the readdir system call returns the number of bytes written }
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if dummy=0 then
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sys_readdir:=nil
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else
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sys_readdir:=p^.buf
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end;
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{*****************************************************************************
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--- Process:Process & program handling - related calls ---
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*****************************************************************************}
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Function Sys_GetPid:LongInt;
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var
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regs : SysCallregs;
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begin
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Sys_GetPid:=SysCall(SysCall_nr_getpid,regs);
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end;
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Procedure Sys_Exit(ExitCode:Integer);
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var
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regs : SysCallregs;
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begin
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regs.reg2:=exitcode;
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SysCall(SysCall_nr_exit,regs)
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end;
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Procedure SigAction(Signum:longint;Act,OldAct:PSigActionRec );
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{
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Change action of process upon receipt of a signal.
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Signum specifies the signal (all except SigKill and SigStop).
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If Act is non-nil, it is used to specify the new action.
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If OldAct is non-nil the previous action is saved there.
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}
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Var
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sr : Syscallregs;
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begin
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sr.reg2:=Signum;
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sr.reg3:=Longint(act);
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sr.reg4:=Longint(oldact);
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SysCall(Syscall_nr_sigaction,sr);
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end;
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function Sys_FTruncate(Handle,Pos:longint):longint; //moved from sysunix.inc Do_Truncate
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var
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sr : syscallregs;
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begin
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sr.reg2:=Handle;
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sr.reg3:=Pos;
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Sys_FTruncate:=syscall(syscall_nr_ftruncate,sr);
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end;
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Function Sys_mmap(adr,len,prot,flags,fdes,off:longint):longint; // moved from sysunix.inc, used in sbrk
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type
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tmmapargs=packed record
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address : longint;
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size : longint;
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prot : longint;
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flags : longint;
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fd : longint;
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offset : longint;
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end;
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var
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t : syscallregs;
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mmapargs : tmmapargs;
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begin
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mmapargs.address:=adr;
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mmapargs.size:=len;
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mmapargs.prot:=prot;
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mmapargs.flags:=flags;
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mmapargs.fd:=fdes;
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mmapargs.offset:=off;
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t.reg2:=longint(@mmapargs);
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Sys_mmap:=syscall(syscall_nr_mmap,t);
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end;
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Function Sys_munmap(adr,len:longint):longint; // moved from sysunix.inc, used in sbrk
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var
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t : syscallregs;
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begin
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t.reg2:=adr;
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t.reg3:=len;
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Sys_munmap:=syscall(syscall_nr_munmap,t);
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end;
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function Clone(func:TCloneFunc;sp:pointer;flags:longint;args:pointer):longint;
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begin
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if (pointer(func)=nil) or (sp=nil) then
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exit(-1); // give an error result
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{$ifdef i386}
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asm
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{ Insert the argument onto the new stack. }
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movl sp,%ecx
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subl $8,%ecx
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movl args,%eax
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movl %eax,4(%ecx)
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{ Save the function pointer as the zeroth argument.
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It will be popped off in the child in the ebx frobbing below. }
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movl func,%eax
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movl %eax,0(%ecx)
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{ Do the system call }
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pushl %ebx
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movl flags,%ebx
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movl SysCall_nr_clone,%eax
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int $0x80
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popl %ebx
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test %eax,%eax
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jnz .Lclone_end
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{ We're in the new thread }
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subl %ebp,%ebp { terminate the stack frame }
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call *%ebx
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{ exit process }
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movl %eax,%ebx
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movl $1,%eax
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int $0x80
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.Lclone_end:
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movl %eax,__RESULT
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end;
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{$endif i386}
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{$ifdef m68k}
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{ No yet translated, my m68k assembler is too weak for such things PM }
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(*
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asm
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{ Insert the argument onto the new stack. }
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movl sp,%ecx
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subl $8,%ecx
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movl args,%eax
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movl %eax,4(%ecx)
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{ Save the function pointer as the zeroth argument.
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It will be popped off in the child in the ebx frobbing below. }
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movl func,%eax
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movl %eax,0(%ecx)
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{ Do the system call }
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pushl %ebx
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movl flags,%ebx
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movl SysCall_nr_clone,%eax
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int $0x80
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popl %ebx
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test %eax,%eax
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jnz .Lclone_end
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{ We're in the new thread }
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subl %ebp,%ebp { terminate the stack frame }
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call *%ebx
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{ exit process }
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movl %eax,%ebx
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movl $1,%eax
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int $0x80
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.Lclone_end:
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movl %eax,__RESULT
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end;
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*)
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{$endif m68k}
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end;
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{
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Interface to Unix ioctl call.
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Performs various operations on the filedescriptor Handle.
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Ndx describes the operation to perform.
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Data points to data needed for the Ndx function. The structure of this
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data is function-dependent.
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}
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Function Sys_IOCtl(Handle,Ndx: Longint;Data: Pointer):LongInt; // This was missing here, instead hardcode in Do_IsDevice
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var
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sr: SysCallRegs;
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begin
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sr.reg2:=Handle;
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sr.reg3:=Ndx;
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sr.reg4:=Longint(Data);
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Sys_IOCtl:=SysCall(Syscall_nr_ioctl,sr);
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end;
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{
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$Log$
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Revision 1.5 2001-10-14 13:33:20 peter
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* start of thread support for linux
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Revision 1.4 2001/06/02 00:31:30 peter
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* merge unix updates from the 1.0 branch, mostly related to the
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solaris target
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}
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