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* Initial BSD version. Still needs a lot of work.
This commit is contained in:
marco
parent
7aab610a15
commit
77dd315869
387
rtl/bsd/syscalls.inc
Normal file
387
rtl/bsd/syscalls.inc
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@ -0,0 +1,387 @@
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{
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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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{BSD version of the syscalls required to implement SysLinux.}
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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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{$ENDIF SYS_LINUX}
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{*****************************************************************************
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--- Main:The System Call Self ---
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*****************************************************************************}
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{ The system designed for Linux can't be used for FreeBSD so easily, since
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FreeBSD pushes arguments, instead of loading them to registers.
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For now I do them in assembler, which makes it easier to test them (copy and
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paste to and AS source). Ultimately I hope to design something like this}
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{
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Function SysCall( callnr:longint;var regs : SysCallregs ):longint;
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{
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This function serves as an interface to do_SysCall.
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If the SysCall returned a negative number, it returns -1, and puts the
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SysCall result in errno. Otherwise, it returns the SysCall return value
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}
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begin
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do_SysCall(callnr,regs);
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if regs.reg1<0 then
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begin
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{$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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{$endif}
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end;
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}
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{$PACKRECORDS C}
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TYPE timeval=RECORD
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tv_sec,
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tv_used : int64;
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END;
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timezone=RECORD
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tz_minuteswest,
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tz_dsttime : LONGINT;
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END;
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function checkreturnvalue(retval:LONGINT;value:LONGINT):LONGINT;
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begin
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if retval<0 THEN
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begin
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errno:=-retval;
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checkreturnvalue:=-1;
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end
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else
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begin
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checkreturnvalue:=value;
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errno:=0
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end;
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end;
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Function Sys_Time:longint;
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VAR tv : timeval;
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tz : timezone;
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retval : longint;
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begin
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asm
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lea tv,%ebx
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pushl %ebx
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lea tz,%ecx
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pushl %ecx
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mov $116,%eax
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int $0x80
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add $8,%esp
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mov %eax,retval
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end;
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sys_time:=checkreturnvalue(retval,tv.tv_sec);
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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 retval: LONGINT;
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Begin
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asm
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pushl mode
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pushl flags
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pushl f
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movl $5,%eax
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int $0x80
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add $12,%esp
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mov %eax,retval
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end;
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sys_open:=checkreturnvalue(retval,retval);
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End;
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Function Sys_Close(f:longint):longint;
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var retval: LONGINT;
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begin
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asm
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pushl f
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movl $6,%eax
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int $0x80
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addl $4,%esp
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mov %eax,retval
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end;
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Sys_Close:=checkreturnvalue(retval,retval);
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end;
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Function Sys_Lseek(F:longint;Off:longint;Whence:longint):longint;
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var retval: LONGINT;
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begin
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asm
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pushl Whence
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pushl Off
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pushl F
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mov $199,%eax
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int $0x80
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addl $12,%eax
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mov %eax,retval
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end;
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Sys_Lseek:=checkreturnvalue(retval,retval);
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end;
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Function Sys_Read(f:longint;buffer:pchar;count:longint):longint;
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var retval: LONGINT;
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begin
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asm
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pushl Count
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pushl Buffer
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pushl F
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mov $3,%eax
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int $0x80
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addl $12,%eax
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mov %eax,retval
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end;
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Sys_Read:=checkreturnvalue(retval,retval);
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end;
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Function Sys_Write(f:longint;buffer:pchar;count:longint):longint;
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var retval: LONGINT;
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begin
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asm
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pushl Count
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pushl Buffer
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pushl F
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mov $4,%eax
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int $0x80
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addl $12,%eax
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mov %eax,retval
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end;
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Sys_Write:=checkreturnvalue(retval,retval);
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end;
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Function Sys_Unlink(Filename:pchar):longint;
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var retval: LONGINT;
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begin
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asm
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pushl FileName
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mov $10,%eax
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int $0x80
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addl $4,%eax
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mov %eax,retval
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end;
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Sys_UnLink:=checkreturnvalue(retval,retval);
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end;
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Function Sys_Rename(Oldname,Newname:pchar):longint;
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var retval: LONGINT;
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begin
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asm
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pushl NewName
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pushl OldName
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mov $38,%eax
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int $0x80
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addl $8,%eax
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mov %eax,retval
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end;
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Sys_Rename:=checkreturnvalue(retval,retval);
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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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{*****************************************************************************
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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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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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{
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$Log$
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Revision 1.1 2000-02-02 15:41:56 marco
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* Initial BSD version. Still needs a lot of work.
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}
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