Bitcoin Forum

gdb bitcoind
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...
(gdb) run
Starting program: /usr/bin/bitcoind 
[Thread debugging using libthread_db enabled]
bitcoin server starting
[New Thread 0xb6aa46d0 (LWP 6475)]
[New Thread 0xb6477b70 (LWP 6478)]
[New Thread 0xb5c76b70 (LWP 6479)]
[New Thread 0xb5475b70 (LWP 6480)]
[New Thread 0xb4c74b70 (LWP 6481)]
[New Thread 0xb4473b70 (LWP 6482)]
[New Thread 0xb3c57b70 (LWP 6483)]
[New Thread 0xb3456b70 (LWP 6484)]
[New Thread 0xb2c39b70 (LWP 6485)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb2c39b70 (LWP 6485)]
Detect128BitSSE2 () at main.cpp:2956
2956	main.cpp: No such file or directory.
	in main.cpp
(gdb) bt full
#0  Detect128BitSSE2 () at main.cpp:2956
	fUseSSE2 = <value optimized out>
	fPrinted = false
	nFamily = 15
	nModel = 2
#1  0xb768fdfc in BitcoinMiner () at main.cpp:3313
	reservekey = {nIndex = 0, vchPubKey = {<std::_Vector_base<unsigned char, std::allocator<unsigned char> >> = {
      _M_impl = {<std::allocator<unsigned char>> = {<__gnu_cxx::new_allocator<unsigned char>> = {<No data fields>}, <No data fields>}, _M_start = 0x0, 
        _M_finish = 0x0, _M_end_of_storage = 0x0}}, <No data fields>}}
	nExtraNonce = <value optimized out>
	nPrevTime = <value optimized out>
	__PRETTY_FUNCTION__ = "void BitcoinMiner()"
#2  0xb7690e32 in ThreadBitcoinMiner (parg=0x0) at main.cpp:2884
No locals.
#3  0xb6acd96e in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#4  0xb6baeb5e in clone () from /lib/libc.so.6
No symbol table info available.

if (!fPrinted)

    // AMD reports a lower model number in 64-bit mode
    if (fAMD && sizeof(void*) > 4 && nFamily * 10000 + nModel >= 160000)
        fUseSSE2 = true;

    static bool fPrinted;
    if (!fPrinted)
    {
        fPrinted = true;
        printf("CPUID %08x family %d, model %d, stepping %d, fUseSSE2=%d\n", nBrand, nFamily, nModel, cpu.nStepping, fUseSSE2);
    }
    return fUseSSE2;

memcpy(&cpu, &a, sizeof(cpu));

g++ -c -O2 -march=pentium4 -pipe -ggdb -Wno-invalid-offsetof -Wformat -DFOURWAYSSE2 -DUSE_SSL -I"/usr/include" -I"/usr/include/crypto++" -I"/usr/include/db4.8"  -o obj/nogui/main.o main.cpp
main.cpp: In function 'void CallCPUID(int, int&, int&)':
main.cpp:2981: error: PIC register clobbered by '%ebx' in 'asm'
main.cpp: In function 'bool Detect128BitSSE2()':
main.cpp:2981: error: PIC register clobbered by '%ebx' in 'asm'
main.cpp:2981: error: PIC register clobbered by '%ebx' in 'asm'
make: *** [obj/nogui/main.o] Error 1

void CallCPUID(int in, int& aret, int& cret)
{
    int a, c;
    asm (
        "mov %2, %%eax; " // in into eax
        "cpuid;"
        "mov %%eax, %0;" // eax into a
        "mov %%ecx, %1;" // ecx into c
        :"=r"(a),"=r"(c) /* output */
        :"r"(in) /* input */
        :"%eax","%ebx","%ecx","%edx" /* clobbered register */
        //:"%eax","%ecx" /* clobbered register */
    );
    aret = a;
    cret = c;
}