I recently upgraded to a newer Cross-compiler tool chain to try to get up to
glibc2.2. I'm now at gcc-2.95.3-14 and binutils-2.10.91-2 (both from Maciej's
site). I have built 2.4.0-test9 with this tool-chain, but is will not boot. It
spews illegal instruction errors when init is launched.
Is this supposed to work, or are the new tools incompatible with older kernels?
I dumped out the disassembly of a newly compiled kernel and found some bad
instructions in many of the routines. First one is from head.S
SNIP>> of bad disassembly
0000000080100280 <except_vec0_r4000>:
except_vec0_r4000():
80100280: 401a4000 mfc0 $k0,$8
80100284: 001ad582 srl $k0,$k0,0x16
80100288: 3c1b0000 lui $k1,0x0
8010028c: 677b0001 0x677b0001
80100290: 001bdc38 0x1bdc38
80100294: 677b8023 0x677b8023
80100298: 001bdc38 0x1bdc38
8010029c: 8f7bb250 lw $k1,-19888($k1)
801002a0: 001ad080 sll $k0,$k0,0x2
801002a4: 037ad821 addu $k1,$k1,$k0
801002a8: 401a2000 mfc0 $k0,$4
801002ac: 8f7b0000 lw $k1,0($k1)
801002b0: 001ad042 srl $k0,$k0,0x1
801002b4: 335a0ff8 andi $k0,$k0,0xff8
801002b8: 037ad821 addu $k1,$k1,$k0
801002bc: 8f7a0000 lw $k0,0($k1)
801002c0: 8f7b0004 lw $k1,4($k1)
801002c4: 001ad182 srl $k0,$k0,0x6
801002c8: 409a1000 mtc0 $k0,$2
801002cc: 001bd982 srl $k1,$k1,0x6
801002d0: 409b1800 mtc0 $k1,$3
801002d4: 10000001 b ffffffff801002dc
<except_vec0_r4000+0x5c>
801002d8: 42000006 tlbwr
801002dc: 00000000 nop
801002e0: 42000018 c0 0x18
<<SNIP
>>SNIP of good assembly from old tools
0000000080100280 <except_vec0_r4000>:
except_vec0_r4000():
80100280: 401a4000 mfc0 $k0,$8
80100284: 001ad582 srl $k0,$k0,0x16
80100288: 3c1b8023 lui $k1,0x8023
8010028c: 8f7bd210 lw $k1,-11760($k1)
80100290: 001ad080 sll $k0,$k0,0x2
80100294: 037ad821 addu $k1,$k1,$k0
80100298: 401a2000 mfc0 $k0,$4
8010029c: 8f7b0000 lw $k1,0($k1)
801002a0: 001ad042 srl $k0,$k0,0x1
801002a4: 335a0ff8 andi $k0,$k0,0xff8
801002a8: 037ad821 addu $k1,$k1,$k0
801002ac: 8f7a0000 lw $k0,0($k1)
801002b0: 8f7b0004 lw $k1,4($k1)
801002b4: 001ad182 srl $k0,$k0,0x6
801002b8: 409a1000 mtc0 $k0,$2
801002bc: 001bd982 srl $k1,$k1,0x6
801002c0: 409b1800 mtc0 $k1,$3
801002c4: 10000001 b 801002cc <except_vec0_r4000+4c>
801002c8: 42000006 tlbwr
801002cc: 00000000 nop
801002d0: 42000018 eret
<<SNIP
Looks like here the tools blow the lui/lw combination and also the eret. Any
suggestions?
