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{
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.
Signal handler is arch dependant due to processor to language
exception conversion.
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.
**********************************************************************}
{ use a trampoline which pushes the return address for proper unwinding }
Procedure SignalToHandleErrorAddrFrame (Errno : longint;addr : CodePointer; frame : Pointer); nostackframe; assembler;
asm
pushq addr
jmp HandleErrorAddrFrame
end;
const
FPU_All = $7f;
function GetFPUState(const SigContext : TSigContext) : word;
begin
if assigned(SigContext.fpstate) then
GetfpuState:=SigContext.fpstate^.swd
else
GetFPUState:=0;
{$ifdef SYSTEM_DEBUG}
writeln('xx:',sigcontext.twd,' ',sigcontext.cwd);
{$endif SYSTEM_DEBUG}
{$ifdef SYSTEM_DEBUG}
Writeln(stderr,'FpuState = ',result);
{$endif SYSTEM_DEBUG}
end;
function GetMMState(const SigContext : TSigContext) : dword;
begin
if assigned(SigContext.fpstate) then
Result:=SigContext.fpstate^.mxcsr
else
Result:=0;
{$ifdef SYSTEM_DEBUG}
Writeln(stderr,'MMState = ',result);
{$endif SYSTEM_DEBUG}
end;
procedure SignalToRunerror(sig : longint; SigInfo: PSigInfo; SigContext: PSigContext); public name '_FPC_DEFAULTSIGHANDLER'; cdecl;
var
res,fpustate,MMState : word;
begin
res:=0;
case sig of
SIGFPE :
begin
{ this is not allways necessary but I don't know yet
how to tell if it is or not PM }
res:=200;
if SigInfo^.si_code<>FPE_INTDIV then
begin
fpustate:=GetFPUState(SigContext^);
if (FpuState and FPU_All) <> 0 then
begin
{ first check the 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 or FPU_Invalid))<>0 Then
res:=207
else
res:=207; {'Coprocessor Error'}
end;
MMState:=getMMState(SigContext^);
if (MMState and MM_ExceptionMask)<>0 then
begin
{ first check the more precise options }
if (MMState and MM_DivisionByZero)<>0 then
res:=208
else if (MMState and MM_Invalid)<>0 Then
res:=207
else if (MMState and MM_Overflow)<>0 then
res:=205
else if (MMState and MM_Underflow)<>0 then
res:=206
else if (MMState and MM_Denormal)<>0 then
res:=216
else
res:=207; {'Coprocessor Error'}
end;
end;
SysResetFPU;
end;
SIGILL,
SIGBUS,
SIGSEGV:
res:=216;
SIGINT:
res:=217;
SIGQUIT:
res:=233;
end;
reenable_signal(sig);
if res<>0 then
begin
SigContext^.rdi := res;
SigContext^.rsi := SigContext^.rip;
SigContext^.rdx := SigContext^.rbp;
SigContext^.rip := ptruint(@SignalToHandleErrorAddrFrame);
end;
end;
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