It tries to read a blob, of course :-). Seriously though, that's what
it does. There's a readBlob function which reads a chunk of memory
into a buffer. It's supposed to be a higher level function which
breaks the chunk into pieces that the memory system can handle and
then put the results back together when giving you the answer. Since
it's not guaranteed to work (the address may be bad, etc.) there's a
tryReadBlob function which does the same thing, it just returns
whether there was a problem instead of complaining about it.
Looking at the trace you have below, I'm guessing that a system call
is happening and that that isn't happening properly. The address used
is 0x160046bbd0, I think, and that looks like a valid address with
junk on the end. If you open your binary with gdb and look at address
0x46bbd0, you'll probably find a string reporting some sort of error.
Judging from the fact that this error is coming from glibc and its
being pretty pretty early in execution, I'm guessing either it thinks
the kernel is too old (you can change the version it thinks it's using
by changing the unameFunc for MIPS) or some other aspect of its
initial environment is wrong. Once you look at the string at that
address, you'll get a better idea of what the problem is.
Gabe
Quoting Xuehan Xu <[email protected]>:
Hi, everyone.
I compiled the source code of "hello" in the directory
"test/test-progs/hello/src" like this:
mips-linux-gnu-gcc --static -EL -o hello hello.c
But when I run the hello program, the following error occured:
306500: system.cpu T0 : @__libc_message+460 : addu r19, r4, r0
: IntAlu : D=0x000000007fffd7e0
307000: system.cpu T0 : @__libc_message+464 : bne r17, r0,
0x401494 : IntAlu :
307500: system.cpu T0 : @__libc_message+468 : addu r5, r16, r0
: IntAlu : D=0x000000000047e8de
308000: system.cpu T0 : @__libc_message+472 : sll r3, r18, 3
: IntAlu : D=0x0000000000000008
308500: system.cpu T0 : @__libc_message+476 : addiu r2, r3, 8
: IntAlu : D=0x0000000000000010
309000: system.cpu T0 : @__libc_message+480 : subu r29, r29, r2
: IntAlu : D=0x000000007fffd7c0
309500: system.cpu T0 : @__libc_message+484 : addiu r17, r29, 16
: IntAlu : D=0x000000007fffd7d0
310000: system.cpu T0 : @__libc_message+488 : addu r6, r17, r3
: IntAlu : D=0x000000007fffd7d8
310500: system.cpu T0 : @__libc_message+492 : addu r5, r4, r0
: IntAlu : D=0x000000007fffd7e0
311000: system.cpu T0 : @__libc_message+496 : addu r16, r0, r0
: IntAlu : D=0x0000000000000000
311500: system.cpu T0 : @__libc_message+500 : addu r7, r0, r0
: IntAlu : D=0x0000000000000000
312000: system.cpu T0 : @__libc_message+504 : lw r2, 4(r5)
: MemRead : D=0x0000000000000016 A=0x7fffd7e4
312500: system.cpu T0 : @__libc_message+508 : lw r4, 0(r5)
: MemRead : D=0x000000000046bbd0 A=0x7fffd7e0
313000: system.cpu T0 : @__libc_message+512 : sw r2, -4(r6)
: MemWrite : D=0x0000000000000016 A=0x7fffd7d4
313500: system.cpu T0 : @__libc_message+516 : lw r3, 4(r5)
: MemRead : D=0x0000000000000016 A=0x7fffd7e4
314000: system.cpu T0 : @__libc_message+520 : addiu r7, r7, 1
: IntAlu : D=0x0000000000000001
314500: system.cpu T0 : @__libc_message+524 : sw r4, -8(r6)
: MemWrite : D=0x000000000046bbd0 A=0x7fffd7d0
315000: system.cpu T0 : @__libc_message+528 : addu r16, r16, r3
: IntAlu : D=0x0000000000000016
315500: system.cpu T0 : @__libc_message+532 : lw r5, 8(r5)
: MemRead : D=0x0000000000000000 A=0x7fffd7e8
316000: system.cpu T0 : @__libc_message+536 : bne r18, r7,
0x401558 : IntAlu :
316500: system.cpu T0 : @__libc_message+540 : addiu r6, r6, -8
: IntAlu : D=0x000000007fffd7d0
317000: system.cpu T0 : @__libc_message+544 : addu r4, r20, r0
: IntAlu : D=0x0000000000000003
317500: system.cpu T0 : @__libc_message+548 : addu r5, r17, r0
: IntAlu : D=0x000000007fffd7d0
318000: system.cpu T0 : @__libc_message+552 : addu r6, r18, r0
: IntAlu : D=0x0000000000000001
318500: system.cpu T0 : @__libc_message+556 : addiu r2, r0, 4146
: IntAlu : D=0x0000000000001032
fatal: readBlob(0x160046bbd0, ...) failed
@ cycle 319000
[readBlob:build/MIPS_SE/mem/translating_port.cc, line 74]
Memory Usage: 558728 KBytes
The compiler I used is "mips-4.2-85-mips-linux-gnu".
So I took a look at the source code, it seems to be cause by the
function tryreadBlob returning false, can anyone tell me what does the
function "readBlob" do?
Thank you:-)
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