Hi,
Attempting to compile the VirtualBox kernel module with
gcc-4.8.0-0.6.fc19.x86_64 results in
vboxnetadp/include/iprt/asm.h:4144:9: error: 'asm' operand has
impossible constraints
The code where it fails is embedded below. Any assembler-knowing person
around who can shed some light on the issue? :)
Thanks,
Sandro
Code:
__asm__ __volatile__("repe; scasl\n\t"
"je 1f\n\t"
# ifdef RT_ARCH_AMD64
"lea -4(%%rdi), %%rdi\n\t"
"xorl (%%rdi), %%eax\n\t"
"subq %5, %%rdi\n\t"
# else
"lea -4(%%edi), %%edi\n\t"
"xorl (%%edi), %%eax\n\t"
"subl %5, %%edi\n\t"
# endif
"shll $3, %%edi\n\t"
"bsfl %%eax, %%edx\n\t"
"addl %%edi, %%edx\n\t"
"1:\t\n"
: "=d" (iBit),
"=&c" (uECX),
"=&D" (uEDI),
"=&a" (uEAX)
: "0" (0xffffffff),
"mr" (pvBitmap),
"1" (cBits >> 5),
"2" (pvBitmap),
"3" (0xffffffff));
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