x86: bpf_jit: support negative offsets
Commita998d43423
claimed to introduce negative offset support to x86 jit, but it couldn't be working, since at the time of the execution of LD+ABS or LD+IND instructions via call into bpf_internal_load_pointer_neg_helper() the %edx (3rd argument of this func) had junk value instead of access size in bytes (1 or 2 or 4). Store size into %edx instead of %ecx (what original commit intended to do) Fixes:a998d43423
("bpf jit: Let the x86 jit handle negative offsets") Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Cc: Jan Seiffert <kaffeemonster@googlemail.com> Cc: Eric Dumazet <edumazet@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -140,7 +140,7 @@ bpf_slow_path_byte_msh:
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push %r9; \
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push SKBDATA; \
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/* rsi already has offset */ \
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mov $SIZE,%ecx; /* size */ \
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mov $SIZE,%edx; /* size */ \
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call bpf_internal_load_pointer_neg_helper; \
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test %rax,%rax; \
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pop SKBDATA; \
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