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fpc/rtl/linux/syslinux.pp

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{
$Id$
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Michael Van Canneyt,
member of the Free Pascal development team.
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.
**********************************************************************}
{ These things are set in the makefile, }
{ But you can override them here.}
{ If you use an aout system, set the conditional AOUT}
{ $Define AOUT}
Unit SysLinux;
Interface
{$ifdef m68k}
{ used for single computations }
const
BIAS4 = $7f-1;
{$endif}
{$define newsignal}
{$I systemh.inc}
{$I heaph.inc}
const
UnusedHandle = -1;
StdInputHandle = 0;
StdOutputHandle = 1;
StdErrorHandle = 2;
var
argc : longint;
argv : ppchar;
envp : ppchar;
Implementation
{$I system.inc}
{ used in syscall to report errors.}
var
Errno : longint;
{ Include constant and type definitions }
{$i errno.inc } { Error numbers }
{$i sysnr.inc } { System call numbers }
{$i sysconst.inc } { Miscellaneous constants }
{$i systypes.inc } { Types needed for system calls }
{ Read actual system call definitions. }
{$i syscalls.inc }
{*****************************************************************************
Misc. System Dependent Functions
*****************************************************************************}
procedure prthaltproc;external name '_haltproc';
procedure System_exit;
begin
{$ifdef i386}
asm
jmp prthaltproc
end;
{$else}
asm
jmp prthaltproc
end;
{$endif}
End;
Function ParamCount: Longint;
Begin
Paramcount:=argc-1
End;
Function ParamStr(l: Longint): String;
var
link,
hs : string;
i : longint;
begin
if l=0 then
begin
str(sys_getpid,hs);
hs:='/proc/'+hs+'/exe'#0;
i:=Sys_readlink(@hs[1],@link[1],high(link));
if i>0 then
begin
link[0]:=chr(i);
paramstr:=link;
end
else
paramstr:=strpas(argv[0]);
end
else
if (l>0) and (l<argc) then
paramstr:=strpas(argv[l])
else
paramstr:='';
end;
Procedure Randomize;
Begin
randseed:=sys_time;
End;
{*****************************************************************************
Heap Management
*****************************************************************************}
var
_HEAP : longint;external name 'HEAP';
_HEAPSIZE : longint;external name 'HEAPSIZE';
function getheapstart:pointer;assembler;
{$ifdef i386}
asm
leal _HEAP,%eax
end ['EAX'];
{$else}
asm
lea.l _HEAP,a0
move.l a0,d0
end;
{$endif}
function getheapsize:longint;assembler;
{$ifdef i386}
asm
movl _HEAPSIZE,%eax
end ['EAX'];
{$else}
asm
move.l _HEAPSIZE,d0
end ['D0'];
{$endif}
{$ifdef bsd}
Function sbrk(size : longint) : Longint;
CONST MAP_PRIVATE =2;
MAP_ANONYMOUS =$1000; {$20 under linux}
begin
Sbrk:=do_syscall(syscall_nr_mmap,0,size,3,MAP_PRIVATE+MAP_ANONYMOUS,-1,0,0);
if ErrNo<>0 then
Sbrk:=0;
end;
{$else}
Function sbrk(size : longint) : Longint;
type
tmmapargs=packed record
address : longint;
size : longint;
prot : longint;
flags : longint;
fd : longint;
offset : longint;
end;
var
t : syscallregs;
mmapargs : tmmapargs;
begin
mmapargs.address:=0;
mmapargs.size:=Size;
mmapargs.prot:=3;
mmapargs.flags:=$22;
mmapargs.fd:=-1;
mmapargs.offset:=0;
t.reg2:=longint(@mmapargs);
Sbrk:=syscall(syscall_nr_mmap,t);
if ErrNo<>0 then
Sbrk:=0;
end;
{$endif}
{ include standard heap management }
{$I heap.inc}
{*****************************************************************************
Low Level File Routines
*****************************************************************************}
{
The lowlevel file functions should take care of setting the InOutRes to the
correct value if an error has occured, else leave it untouched
}
Procedure Errno2Inoutres;
{
Convert ErrNo error to the correct Inoutres value
}
begin
if ErrNo=0 then { Else it will go through all the cases }
exit;
case ErrNo of
Sys_ENFILE,
Sys_EMFILE : Inoutres:=4;
Sys_ENOENT : Inoutres:=2;
Sys_EBADF : Inoutres:=6;
Sys_ENOMEM,
Sys_EFAULT : Inoutres:=217;
Sys_EINVAL : Inoutres:=218;
Sys_EPIPE,
Sys_EINTR,
Sys_EIO,
Sys_EAGAIN,
Sys_ENOSPC : Inoutres:=101;
Sys_ENAMETOOLONG,
Sys_ELOOP,
Sys_ENOTDIR : Inoutres:=3;
Sys_EROFS,
Sys_EEXIST,
Sys_EACCES : Inoutres:=5;
Sys_ETXTBSY : Inoutres:=162;
end;
end;
Procedure Do_Close(Handle:Longint);
Begin
sys_close(Handle);
End;
Procedure Do_Erase(p:pchar);
Begin
sys_unlink(p);
Errno2Inoutres;
End;
Procedure Do_Rename(p1,p2:pchar);
Begin
sys_rename(p1,p2);
Errno2Inoutres;
End;
Function Do_Write(Handle,Addr,Len:Longint):longint;
Begin
repeat
Do_Write:=sys_write(Handle,pchar(addr),len);
until ErrNo<>Sys_EINTR;
Errno2Inoutres;
if Do_Write<0 then
Do_Write:=0;
End;
Function Do_Read(Handle,Addr,Len:Longint):Longint;
Begin
repeat
Do_Read:=sys_read(Handle,pchar(addr),len);
until ErrNo<>Sys_EINTR;
Errno2Inoutres;
if Do_Read<0 then
Do_Read:=0;
End;
Function Do_FilePos(Handle: Longint): Longint;
Begin
Do_FilePos:=sys_lseek(Handle, 0, Seek_Cur);
Errno2Inoutres;
End;
Procedure Do_Seek(Handle,Pos:Longint);
Begin
sys_lseek(Handle, pos, Seek_set);
End;
Function Do_SeekEnd(Handle:Longint): Longint;
begin
Do_SeekEnd:=sys_lseek(Handle,0,Seek_End);
end;
{$ifdef BSD}
Function Do_FileSize(Handle:Longint): Longint;
var
Info : Stat;
Begin
if do_SysCall(syscall_nr_fstat,handle,longint(@info))=0 then
Do_FileSize:=Info.Size
else
Do_FileSize:=0;
Errno2Inoutres;
End;
{$ELSE}
Function Do_FileSize(Handle:Longint): Longint;
var
regs : Syscallregs;
Info : Stat;
Begin
regs.reg2:=Handle;
regs.reg3:=longint(@Info);
if SysCall(SysCall_nr_fstat,regs)=0 then
Do_FileSize:=Info.Size
else
Do_FileSize:=0;
Errno2Inoutres;
End;
{$endif}
Procedure Do_Truncate(Handle,Pos:longint);
{$ifndef bsd}
var
sr : syscallregs;
{$endif}
begin
{$ifdef bsd}
do_syscall(syscall_nr_ftruncate,handle,pos,0);
{$else}
sr.reg2:=Handle;
sr.reg3:=Pos;
syscall(syscall_nr_ftruncate,sr);
{$endif}
Errno2Inoutres;
end;
Procedure Do_Open(var f;p:pchar;flags:longint);
{
FileRec and textrec have both Handle and mode as the first items so
they could use the same routine for opening/creating.
when (flags and $100) the file will be append
when (flags and $1000) the file will be truncate/rewritten
when (flags and $10000) there is no check for close (needed for textfiles)
}
var
oflags : longint;
dirtest : stat;
Begin
{ close first if opened }
if ((flags and $10000)=0) then
begin
case FileRec(f).mode of
fminput,fmoutput,fminout : Do_Close(FileRec(f).Handle);
fmclosed : ;
else
begin
inoutres:=102; {not assigned}
exit;
end;
end;
end;
{ reset file Handle }
FileRec(f).Handle:=UnusedHandle;
{ We do the conversion of filemodes here, concentrated on 1 place }
case (flags and 3) of
0 : begin
oflags :=Open_RDONLY;
FileRec(f).mode:=fminput;
end;
1 : begin
oflags :=Open_WRONLY;
FileRec(f).mode:=fmoutput;
end;
2 : begin
oflags :=Open_RDWR;
FileRec(f).mode:=fminout;
end;
end;
if (flags and $1000)=$1000 then
oflags:=oflags or (Open_CREAT or Open_TRUNC)
else
if (flags and $100)=$100 then
oflags:=oflags or (Open_APPEND);
{ empty name is special }
if p[0]=#0 then
begin
case FileRec(f).mode of
fminput :
FileRec(f).Handle:=StdInputHandle;
fminout, { this is set by rewrite }
fmoutput :
FileRec(f).Handle:=StdOutputHandle;
fmappend :
begin
FileRec(f).Handle:=StdOutputHandle;
FileRec(f).mode:=fmoutput; {fool fmappend}
end;
end;
exit;
end;
{ real open call }
FileRec(f).Handle:=sys_open(p,oflags,438);
if (ErrNo=Sys_EROFS) and ((OFlags and Open_RDWR)<>0) then
begin
Oflags:=Oflags and not(Open_RDWR);
FileRec(f).Handle:=sys_open(p,oflags,438);
end;
{ Check if it's a directory, then we should return io error 2 }
if ErrNo=0 then
begin
if (Sys_fstat(filerec(f).handle,dirtest)<>0) then
inoutres:=2
else
if (dirtest.mode and STAT_IFMT)<>STAT_IFREG then
inoutres:=2;
end;
Errno2Inoutres;
End;
Function Do_IsDevice(Handle:Longint):boolean;
{
Interface to Unix ioctl call.
Performs various operations on the filedescriptor Handle.
Ndx describes the operation to perform.
Data points to data needed for the Ndx function. The structure of this
data is function-dependent.
}
var
{$ifndef BSD}
sr: SysCallRegs;
{$endif}
Data : array[0..255] of byte; {Large enough for termios info}
begin
{$ifdef BSD}
Do_IsDevice:=(do_SysCall(syscall_nr_ioctl,handle,$5401,longint(@data))=0);
{$else}
sr.reg2:=Handle;
sr.reg3:=$5401; {=TCGETS}
sr.reg4:=Longint(@Data);
Do_IsDevice:=(SysCall(Syscall_nr_ioctl,sr)=0);
{$endif}
end;
{*****************************************************************************
UnTyped File Handling
*****************************************************************************}
{$i file.inc}
{*****************************************************************************
Typed File Handling
*****************************************************************************}
{$i typefile.inc}
{*****************************************************************************
Text File Handling
*****************************************************************************}
{$DEFINE SHORT_LINEBREAK}
{$DEFINE EXTENDED_EOF}
{$i text.inc}
{*****************************************************************************
Directory Handling
*****************************************************************************}
Procedure MkDir(Const s: String);[IOCheck];
Var
Buffer: Array[0..255] of Char;
Begin
If InOutRes <> 0 then exit;
Move(s[1], Buffer, Length(s));
Buffer[Length(s)] := #0;
sys_mkdir(@buffer, 511);
Errno2Inoutres;
End;
Procedure RmDir(Const s: String);[IOCheck];
Var
Buffer: Array[0..255] of Char;
Begin
If InOutRes <> 0 then exit;
Move(s[1], Buffer, Length(s));
Buffer[Length(s)] := #0;
sys_rmdir(@buffer);
Errno2Inoutres;
End;
Procedure ChDir(Const s: String);[IOCheck];
Var
Buffer: Array[0..255] of Char;
Begin
If InOutRes <> 0 then exit;
Move(s[1], Buffer, Length(s));
Buffer[Length(s)] := #0;
sys_chdir(@buffer);
Errno2Inoutres;
End;
procedure getdir(drivenr : byte;var dir : shortstring);
var
thisdir : stat;
rootino,
thisino,
dotdotino : longint;
rootdev,
thisdev,
dotdotdev : {$ifdef bsd}longint{$else}word{$endif};
thedir,dummy : string[255];
dirstream : pdir;
d : pdirent;
mountpoint,validdir : boolean;
predot : string[255];
begin
drivenr:=0;
dir:='';
thedir:='/'#0;
if sys_stat(@thedir[1],thisdir)<0 then
exit;
rootino:=thisdir.ino;
rootdev:=thisdir.dev;
thedir:='.'#0;
if sys_stat(@thedir[1],thisdir)<0 then
exit;
thisino:=thisdir.ino;
thisdev:=thisdir.dev;
{ Now we can uniquely identify the current and root dir }
thedir:='';
predot:='';
while not ((thisino=rootino) and (thisdev=rootdev)) do
begin
{ Are we on a mount point ? }
dummy:=predot+'..'#0;
if sys_stat(@dummy[1],thisdir)<0 then
exit;
dotdotino:=thisdir.ino;
dotdotdev:=thisdir.dev;
mountpoint:=(thisdev<>dotdotdev);
{ Now, Try to find the name of this dir in the previous one }
dirstream:=opendir (@dummy[1]);
if dirstream=nil then
exit;
repeat
d:=sys_readdir (dirstream);
validdir:=false;
if (d<>nil) and
(not ((d^.name[0]='.') and ((d^.name[1]=#0) or ((d^.name[1]='.')
and (d^.name[2]=#0))))) and
(mountpoint or (d^.ino=thisino)) then
begin
dummy:=predot+'../'+strpas(@(d^.name[0]))+#0;
validdir:=not (sys_stat (@(dummy[1]),thisdir)<0);
end
else
validdir:=false;
until (d=nil) or
((validdir) and (thisdir.dev=thisdev) and (thisdir.ino=thisino) );
if (closedir(dirstream)<0) or (d=nil) then
exit;
{ At this point, d.name contains the name of the current dir}
thedir:='/'+strpas(@(d^.name[0]))+thedir;
thisdev:=dotdotdev;
thisino:=dotdotino;
predot:=predot+'../';
end;
{ Now rootino=thisino and rootdev=thisdev so we've reached / }
dir:=thedir
end;
{*****************************************************************************
SystemUnit Initialization
*****************************************************************************}
{$ifdef I386}
{ this should be defined in i386 directory !! PM }
const
fpucw : word = $1332;
FPU_Invalid = 1;
FPU_Denormal = 2;
FPU_DivisionByZero = 4;
FPU_Overflow = 8;
FPU_Underflow = $10;
FPU_StackUnderflow = $20;
FPU_StackOverflow = $40;
{$endif I386}
Procedure ResetFPU;
begin
{$ifdef I386}
{$ifndef CORRECTFLDCW}
{$asmmode direct}
{$endif}
asm
fninit
fldcw fpucw
end;
{$ifndef CORRECTFLDCW}
{$asmmode att}
{$endif}
{$endif I386}
end;
{$ifndef BSD}
{$ifndef newSignal}
Procedure SignalToRunError(Sig:longint);
begin
case sig of
8 : begin
{ this is not allways necessary but I don't know yet
how to tell if it is or not PM }
ResetFPU;
HandleError(200);
end;
11 : HandleError(216);
end;
end;
Procedure InstallSignals;
var
sr : syscallregs;
begin
sr.reg3:=longint(@SignalToRunError);
{ sigsegv }
sr.reg2:=11;
syscall(syscall_nr_signal,sr);
{ sigfpe }
sr.reg2:=8;
syscall(syscall_nr_signal,sr);
end;
{$else newSignal}
{$i i386/signal.inc}
procedure SignalToRunerror(Sig: longint; SigContext: SigContextRec); cdecl;
var
res,fpustate : word;
begin
res:=0;
case sig of
8 : begin
{ this is not allways necessary but I don't know yet
how to tell if it is or not PM }
{$ifdef I386}
fpustate:=0;
res:=200;
if assigned(SigContext.fpstate) then
fpuState:=SigContext.fpstate^.sw;
{$ifdef SYSTEMDEBUG}
Writeln(stderr,'FpuState = ',Hexstr(FpuState,4));
{$endif SYSTEMDEBUG}
if (FpuState and $7f) <> 0 then
begin
{ first check te more precise options }
if (FpuState and FPU_DivisionByZero)<>0 then
res:=200
else if (FpuState and FPU_Overflow)<>0 then
res:=205
else if (FpuState and FPU_Underflow)<>0 then
res:=206
else if (FpuState and FPU_Denormal)<>0 then
res:=216
else if (FpuState and (FPU_StackOverflow or FPU_StackUnderflow))<>0 then
res:=207
else if (FpuState and FPU_Invalid)<>0 then
res:=216
else
res:=207; {'Coprocessor Error'}
end;
{$endif I386}
ResetFPU;
end;
11 : res:=216;
end;
{ give runtime error at the position where the signal was raised }
if res<>0 then
begin
{$ifdef I386}
HandleErrorAddrFrame(res,SigContext.eip,SigContext.ebp);
{$else}
HandleError(res);
{$endif}
end;
end;
Procedure InstallSignals;
const
act: SigActionRec = (handler:(Sa:@SignalToRunError);sa_mask:0;sa_flags:0;
Sa_restorer: NIL);
oldact: PSigActionRec = Nil;
begin
ResetFPU;
SigAction(8,@act,oldact);
SigAction(11,@act,oldact);
end;
{$endif newSignal}
{$endif bsd}
procedure SetupCmdLine;
var
bufsize,
len,j,
size,i : longint;
found : boolean;
buf : array[0..1026] of char;
procedure AddBuf;
begin
reallocmem(cmdline,size+bufsize);
move(buf,cmdline[size],bufsize);
inc(size,bufsize);
bufsize:=0;
end;
begin
size:=0;
bufsize:=0;
i:=0;
while (i<argc) do
begin
len:=strlen(argv[i]);
if len>sizeof(buf)-2 then
len:=sizeof(buf)-2;
found:=false;
for j:=1 to len do
if argv[i][j]=' ' then
begin
found:=true;
break;
end;
if bufsize+len>=sizeof(buf)-2 then
AddBuf;
if found then
begin
buf[bufsize]:='"';
inc(bufsize);
end;
move(argv[i]^,buf[bufsize],len);
inc(bufsize,len);
if found then
begin
buf[bufsize]:='"';
inc(bufsize);
end;
if i<argc then
buf[bufsize]:=' '
else
buf[bufsize]:=#0;
inc(bufsize);
inc(i);
end;
AddBuf;
end;
Begin
{ Set up signals handlers }
{$ifndef bsd}
InstallSignals;
{$endif}
{ Setup heap }
InitHeap;
InitExceptions;
{ Arguments }
SetupCmdLine;
{ Setup stdin, stdout and stderr }
OpenStdIO(Input,fmInput,StdInputHandle);
OpenStdIO(Output,fmOutput,StdOutputHandle);
OpenStdIO(StdOut,fmOutput,StdOutputHandle);
OpenStdIO(StdErr,fmOutput,StdErrorHandle);
{ Reset IO Error }
InOutRes:=0;
End.
{
$Log$
Revision 1.49 2000-07-08 18:02:39 peter
* do_open checks for directory, if directory then ioerror 2
Revision 1.48 2000/06/30 22:14:03 peter
* removed obsolete crtlib code
* support EINTR for read/write to restart the syscall
Revision 1.47 2000/05/11 17:55:13 peter
* changed order of fpustate checking to first check the more
specific states
Revision 1.46 2000/05/08 14:27:36 peter
* released newsignal
* newsignal gives now better backtraces using the sigcontext eip/ebp
fields
Revision 1.45 2000/04/16 16:07:58 marco
* BSD fixes
Revision 1.44 2000/04/14 13:04:53 marco
* Merged bsd/syslinux.pp and 1.43 linux/syslinux.pp to this file with ifdefs
Revision 1.43 2000/04/07 14:56:36 peter
* switch to direct asm if not correctfldcw defined
Revision 1.42 2000/03/31 23:26:32 pierre
* FPU needs reset for all SIGFPE even from integer division by zero
Revision 1.41 2000/03/31 23:21:19 pierre
* multiple exception handling works
(for linux only if syslinux is compiled with -dnewsignal)
Revision 1.40 2000/03/31 13:24:28 jonas
* signal handling using sigaction when compiled with -dnewsignal
(allows multiple signals to be received in one run)
Revision 1.39 2000/03/25 12:28:37 peter
* patch for getdir from Pierre
Revision 1.38 2000/03/23 15:24:18 peter
* remove handle check for do_close
Revision 1.37 2000/02/09 16:59:32 peter
* truncated log
Revision 1.36 2000/02/09 12:17:51 peter
* moved halt to system.inc
* syslinux doesn't use direct asm anymore
Revision 1.35 2000/02/08 11:47:09 peter
* paramstr(0) support
Revision 1.34 2000/01/20 23:38:02 peter
* support fm_inout as stdoutput for assign(f,'');rewrite(f,1); becuase
rewrite opens always with filemode 2
Revision 1.33 2000/01/16 22:25:38 peter
* check handle for file closing
Revision 1.32 2000/01/07 16:41:41 daniel
* copyright 2000
Revision 1.31 2000/01/07 16:32:28 daniel
* copyright 2000 added
Revision 1.30 1999/12/01 22:57:31 peter
* cmdline support
Revision 1.29 1999/11/06 14:39:12 peter
* truncated log
Revision 1.28 1999/10/28 09:50:06 peter
* use mmap instead of brk
Revision 1.27 1999/09/10 15:40:35 peter
* fixed do_open flags to be > $100, becuase filemode can be upto 255
Revision 1.26 1999/09/08 16:14:43 peter
* pointer fixes
Revision 1.25 1999/07/28 23:18:36 peter
* closedir fixes, which now disposes the pdir itself
}
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