Hi everyone,
Based on Ed's work, I've made a patch to really make the XBox support
work :-) It contained two minor flaws, both of which are fixed by the
patch. If I apply it, I see the OpenBIOS welcome screen.
You can download it from
http://rink.nu/downloads/xbox-patches/openbios-xbox.diff. Feel free to
apply it in the tree.
--
Rink P.W. Springer - http://rink.nu
"God, root, what is difference?" - Pitr, Userfriendly
Hello All,
When I try to tokenize a large FCode source file, the
tokenizer crashes with Segmentation Fault.
Debug messages:
tst.fth:6763: debug: tokenizing control word 'endof'
tst.fth:6764: debug: read token 'endcase', length=7
tst.fth:6764: debug: matched internal opcode 0x0013
tst.fth:6764: debug: tokenizing control word 'endcase'
tst.fth:6764: debug: endcase offset 0x8401
tst.fth:6764: debug: endcase offset 0xffff83f1
??????????
Segmentation fault (core dumped)
When I looked at the code, the offending function was
in emit.c :
s16 receive_offset(void)
{
s16 offs=0;
if (offs16) {
offs= ((*opc)<<8)|(*(opc+1));
} else {
offs=(*opc);
}
return offs;
}
If the msb of *opc is set 1(Value >0 0x8yyy), the offs
gets changed to ffff8yyy.
Changing offs to u16 and receive_offset returning
value of u16 type would solve the problem. Change the
prototype for receive_offset in emit.h as well.
Modified code:
u16 receive_offset(void) <----This line changed
{
u16 offs=0; <---- This line changed
if (offs16) {
offs= ((*opc)<<8)|(*(opc+1));
} else {
offs=(*opc);
}
return offs;
}
Steps to reproduce the problem very simply:
- Create a fcode source file with around 7000
variables.
- Use the following simple test code:
: test ( -- )
1 to temp1
2 to temp2
temp1 case
1 of
." One" cr
endof
2 of temp2
." Two" cr
endof
endcase
;
- Run tokenizer on the file. toke will core dump.
Regards,
Prasanna
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