Here is the function putPromChar in which I have the problem:
80101e70 <putPromChar>:
80101e70: 3c028039 lui $v0,0x8039
80101e74: 244519f0 addiu $a1,$v0,6640
80101e78: 8ca30014 lw $v1,20($a1)
80101e7c: 00042600 sll $a0,$a0,24
80101e80: 27bdfff0 addiu $sp,$sp,-16
80101e84: 00043603 sra $a2,$a0,24
80101e88: 10600012 beqz $v1,80101ed4 <putPromChar+0x64>
80101e8c: 00001025 move $v0,$zero
80101e90: 8ca20004 lw $v0,4($a1)
80101e94: 3c038036 lui $v1,0x8036
80101e98: 8c64c9a0 lw $a0,-13920($v1)
80101e9c: 2442001c addiu $v0,$v0,28
80101ea0: 00822021 addu $a0,$a0,$v0
80101ea4: 00000000 nop
80101ea8: 8c820000 lw $v0,0($a0)
80101eac: 30420020 andi $v0,$v0,0x20
80101eb0: 1040fffd beqz $v0,80101ea8 <putPromChar+0x38>
80101eb4: 3c028039 lui $v0,0x8039
80101eb8: 8c4319f4 lw $v1,6644($v0)
80101ebc: 3c048036 lui $a0,0x8036
80101ec0: 8c82c9a0 lw $v0,-13920($a0)
80101ec4: 24630004 addiu $v1,$v1,4
80101ec8: 00431021 addu $v0,$v0,$v1
80101ecc: ac460000 sw $a2,0($v0)
80101ed0: 24020001 li $v0,1
80101ed4: 03e00008 jr $ra
80101ed8: 27bd0010 addiu $sp,$sp,16
80101edc: 00000000 nop
with WinMon (bootloader) I get this (this is perhaps more readable...):
[80101e70] 3c028039 lui r2,0x8039 putPromChar
[80101e74] 244519f0 addiu r5,r2,0x19f0
[80101e78] 8ca30014 lw r3,0x0014(r5)
[80101e7c] 00042600 sll r4,r4,24
[80101e80] 27bdfff0 addiu r29,r29,0xfff0
[80101e84] 00043603 sra r6,r4,24
[80101e88] 10600012 beq r3,r0,0x0012
[80101e90] 8ca20004 lw r2,0x0004(r5) --> in 2.6 it reads 0 at address r5 + 0x4
[80101e94] 3c038036 lui r3,0x8036
[80101e98] 8c64c9a0 lw r4,0xc9a0(r3) --> in 2.6 it reads 0 at adress r3 + 0xc9a0
[80101e9c] 2442001c addiu r2,r2,0x001c
[80101ea0] 00822021 addu r4,r4,r2 ==> in 2.4 it returns bf010f1c in r4
[80101ea8] 8c820000 lw r2,0x0000(r4)
* Exception 0x02 (user) : TLB (load or instruction fetch) *
* in address: 80101ea8
ClockDiv2+0xe38:
[80101ea8] 8c820000 lw r2,0x0000(r4)
r0(zero): 00000000 r1(AT) : 1000fc00 r2(v0) : 0000001c r3(v1) : 80360000
r4(a0) : 0000001c r5(a1) : 803919f0 r6(a2) : 0000000d r7(a3) : 8038df8c
I hope this will help and many thanks for your help!
Yoann
Florian DELIZY wrote:
> Hi,
> I am no more a newbie but I still need some help to build kernels :
> I am working on the Wintegra Evaluation Board (WEB777) and I used the
> 2.4 kernel Wintegra gave me with the patch for that board.
> I tried to adapt the patch for the 2.6 kernel but it doesn't work. I
> traced the kernel to find it crashed very early before displaying
anything.
> In fact the host processor makes an address and tries to read it but
> this makes an exception :
> * Exception 0x02 (user) : TLB (load or instruction fetch) *
> * in address: 80101ea8
> ClockDiv2+0xe38:
> [80101ea8] 8c820000 lw r2,0x0000(r4)
> r0(zero): 00000000 r1(AT) : 1000fc00 r2(v0) : 0000001c r3(v1) :
80360000
> r4(a0) : 0000001c r5(a1) : 803919f0 r6(a2) : 0000000d r7(a3) :
8038df8c
That would help a lot if you could objdump your kernel and give us 10
instructions before (at least)
and 10 instructions after it, you could try an :
mips-linux-objdump -DSz vmlinux | grep -U 20 '^\[80101ea8\]'
and send the output (that should ouput around 20 lines (which will
hopefully contain some C code also,
assuùing that you compiled the code with debug informations. Moreover
you can also tell us in which
symbol (function) is located the address 0x80101ea8.
> I think this is a problem of host processor misconfiguration, but don't
> find out exactly what it is... To make the address in R4, the processor
> reads some zeroes where in 2.4 kernel, it doesn't and the address read
> in 2.4 is something like 0xbf010f1c.
> I don't know if this can help but here are the few functions before
crash:
> kernel_entry
> J start_kernel
> cpu_probe() (WEB777 patch)
> prom_init() (WEB777 patch)
> setup_prom_printf() (WEB777 patch)
> wds_prom_printf() (WEB777 patch)
> putPromChar() (WEB777 patch)
> --> CRASH
You should also start to figure out which variable/pointer anything is
consulted to get this adress (0x0000001c)
which might then help to understand you're problem.
Regards
Florian Delizy
