My apologies for yet another off-topic post - I hope I am not polluting the
list.
Unfortunately I am still struggling with stage2 of gcc-4.4 and 4.6 on the NeXT.
I think I have everything configured correctly and the stage1 compiler
produces good executables as long as they do not include jump tables.
Unfortunately I get bus errors and segmentation faults with jump tables. I
think the issue here might be with the limitations of the native NEXTSTEP
assembler based on gas-1.38.
When I compile the following test program:
int main( void )
{
int i, value, sum;
i = 2;
sum = 0;
switch( i )
{
case 1:
value = 1;
break;
case 2:
value = 2;
break;
case 3:
value = 3;
break;
case 4:
value = 4;
break;
case 5:
value = 5;
break;
default:
value = 0;
break;
}
sum += value;
printf( "Sum = %d (case %d)\n", sum, i );
return (0);
}
The stage1 gcc-4.6.3 compiler produces the following assembly:
.cstring
LC0:
.ascii "Sum = %d (case %d)\12\0"
.text
.align 1
.globl _main
_main:
link a6,#-12
moveq #2,d0
movel d0,a6@(-8)
clrl a6@(-12)
moveq #5,d0
cmpl a6@(-8),d0
jcs L2
movel a6@(-8),d0
lsll #2,d0
movel pc@(L8,d0:l),d0
movel d0,a0
jmp a0@
.const
.align 1
L8:
.long L2
.long L3
.long L4
.long L5
.long L6
.long L7
.text
L3:
moveq #1,d0
movel d0,a6@(-4)
jra L9
L4:
moveq #2,d0
movel d0,a6@(-4)
jra L9
L5:
moveq #3,d0
movel d0,a6@(-4)
jra L9
L6:
moveq #4,d0
movel d0,a6@(-4)
jra L9
L7:
moveq #5,d0
movel d0,a6@(-4)
jra L9
L2:
clrl a6@(-4)
nop
L9:
movel a6@(-4),d0
addl d0,a6@(-12)
movel a6@(-8),sp@-
movel a6@(-12),sp@-
pea LC0
jsr _printf
addw #12,sp
clrl d0
unlk a6
rts
Could someone please kindly confirm that the above assembly source is good?
Unfortunately I hardly remember anything at all from my m68k assembly
adventures 20+ years ago and I have been struggling to decipher it...
Thank you very much!
t-rexky
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