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Date: Mon, 1 May 2017 19:49:21 -0700 From: Alexei Starovoitov <ast@...com> To: David Miller <davem@...emloft.net> CC: <daniel@...earbox.net>, <aconole@...heb.org>, <netdev@...r.kernel.org>, <xdp-newbies@...r.kernel.org> Subject: Re: [PATCH v3 binutils] Add BPF support to binutils... On 4/30/17 11:21 AM, David Miller wrote: > built with: > > clang -O2 -target bpfel -g -c x.c -o x.o > > readelf can see it just fine: > > [davem@...alhost binutils]$ ./readelf --debug-dump=loc ./xel.o > Contents of the .debug_loc section: > > Offset Begin End Expression > 00000000 0000000000000000 0000000000000010 (DW_OP_reg1 (r1)) > 00000013 <End of list> > 00000023 0000000000000010 0000000000000020 (DW_OP_constu: 590618314553; DW_OP_stack_value) > 0000003d 0000000000000020 0000000000000030 (DW_OP_reg1 (r1)) > 00000050 <End of list> > > But with big-endian: > > [davem@...alhost binutils]$ ./readelf --debug-dump=loc ./xeb.o > readelf: Warning: Invalid pointer size (0) in compunit header, using 4 instead > readelf: Warning: Bogus end-of-siblings marker detected at offset 27 in .debug_info section > readelf: Warning: Bogus end-of-siblings marker detected at offset 28 in .debug_info section > readelf: Warning: DIE at offset 0x29 refers to abbreviation number 48 which does not exist > readelf: Warning: Unable to load/parse the .debug_info section, so cannot interpret the .debug_loc section. yeah. clang emitted dwarf for big-endian is broken. This dwarf stuff is too complicated for normal human beings. The tight packing making debugging it quite painful.
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