Failed to build arm64 bpf samples with LLVM 3.7 on 4.3 kernel
Shi, Yang
yang.shi at linaro.org
Tue Nov 10 11:25:42 PST 2015
Hi guys,
I just tried to build arm64 bpf samples on 4.3 kernel, but LLVM complain:
LLVM ERROR: Inline asm not supported by this streamer because we don't
have an asm parser for this target
I took some time to bisect it, then found it is caused by sysreg.h
There is inline assembly macro defined in sysreg.h:
asm(
" .irp
num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
" .equ __reg_num_x\\num, \\num\n"
" .endr\n"
" .equ __reg_num_xzr, 31\n"
"\n"
" .macro mrs_s, rt, sreg\n"
" .inst 0xd5200000|(\\sreg)|(__reg_num_\\rt)\n"
" .endm\n"
"\n"
" .macro msr_s, sreg, rt\n"
" .inst 0xd5000000|(\\sreg)|(__reg_num_\\rt)\n"
" .endm\n"
);
sysreg.h was not included by any other arm64 header files in 4.2, but in
4.3 it is included by futex.h and uaccess.h, which are included by bpf
samples via skbuff.h.
But, it sounds LLVM can't recognize it. I'm not familiar with LLVM, so
any suggestion?
Could it be worked around by some LLVM compile flags?
Thanks,
Yang
More information about the linux-arm-kernel
mailing list