1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
{
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.
**********************************************************************}
const
{ Bits in control register }
RoundingMode = $30;
RoundingPrecision = $c0;
InexactDecimal = $100;
InexactOperation = $200;
DivideByZero = $400;
UnderFlow = $800;
OverFlow = $1000;
OperandError = $2000;
SignalingNaN = $4000;
BranchOnUnordered = $800;
fpucw : longint = {InexactOperation or }DivideByZero or
OverFlow or OperandError or
SignalingNaN or BranchOnUnordered;
fpust : longint = 0;
{ Bits in status register }
FPU_Invalid = $80;
FPU_Denormal = $8;
FPU_DivisionByZero = $10;
FPU_Overflow = $40;
FPU_Underflow = $20;
{ m68k is not stack based }
FPU_StackUnderflow = $0;
FPU_StackOverflow = $0;
FPU_All = $f8;
Procedure ResetFPU;
begin
asm
fmove.l fpucw,fpcr
fmove.l fpust,fpsr
end;
end;
function GetFPUState(const SigContext : TSigContext) : longint;
begin
GetfpuState:=SigContext.psr;
{$ifdef SYSTEM_DEBUG}
Writeln(stderr,'FpuState = ',GetFpuState);
{$endif SYSTEM_DEBUG}
end;
procedure SignalToRunerror(Sig: longint; Info : pointer; var SigContext: TSigContext); public name '_FPC_DEFAULTSIGHANDLER'; cdecl;
var
res,fpustate : 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;
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))<>0 then
res:=207
else if (FpuState and FPU_Invalid)<>0 then
res:=216
else
res:=207; {'Coprocessor Error'}
end;
ResetFPU;
end;
SIGILL,
SIGBUS,
SIGSEGV :
res:=216;
SIGINT:
res:=217;
SIGQUIT:
res:=233;
end;
reenable_signal(sig);
{ give runtime error at the position where the signal was raised }
if res<>0 then
begin
{ HandleErrorAddrFrame(res,SigContext.sc_pc,SigContext.sc_fp);}
{ fp is not saved in context record :( }
HandleError(res);
HandleError(res);
end;
end;
|
