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6 Commits

Author SHA1 Message Date
Yonghong Song b68cef9dd0 bpf: New disassembler testcases for 32-bit subregister support 
This patch test disassembler output for load/store instructions when
-mattr=+alu32 specified for which we want to use "w" register format.

Also, this patch extended the existing insn-unit.s and insn-unit-32.s to
make sure disassemblers for all other instructions are not affected.

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Yonghong Song <yhs@fb.com>
llvm-svn: 325993
 2018-02-23 23:49:35 +00:00
Yonghong Song ce96738dee bpf: print backward branch target properly 
Currently, it prints the backward branch offset as unsigned value
like below:
       7:       7d 34 0b 00 00 00 00 00         if r4 s>= r3 goto 11 <LBB0_3>
       8:       b7 00 00 00 00 00 00 00         r0 = 0
LBB0_2:
       9:       07 00 00 00 01 00 00 00         r0 += 1
      ......
      17:       bf 31 00 00 00 00 00 00         r1 = r3
      18:       6d 32 f6 ff 00 00 00 00         if r2 s> r3 goto 65526 <LBB0_3+0x7FFB0>

The correct print insn 18 should be:
      18:       6d 32 f6 ff 00 00 00 00         if r2 s> r3 goto -10 <LBB0_2>

To provide better clarity and be consistent with kernel verifier output,
the insn 7 output is changed to the following with "+" added to
non-negative branch offset:
       7:       7d 34 0b 00 00 00 00 00         if r4 s>= r3 goto +11 <LBB0_3>

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 318442
 2017-11-16 19:15:36 +00:00
Yonghong Song 09b01b3555 bpf: fix an insn encoding issue for neg insn 
Signed-off-by: Yonghong Song <yhs@fb.com>
llvm-svn: 314911
 2017-10-04 16:11:52 +00:00
Yonghong Song e9165f8720 bpf: add new insns for bswap_to_le and negation 
This patch adds new insn, "reg = be16/be32/be64 reg",
for bswap to little endian for big-endian target (bpfeb).
It also adds new insn for negation "reg = -reg".

Currently, for source code, e.g.,
  b = -a
LLVM still prefers to generate:
  b = 0 - a
But "reg = -reg" format can be used in assembly code.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 314376
 2017-09-28 02:46:11 +00:00
Simon Dardis 6819a7a1cb [bpf] Fix test to always use little endian. 
r313055 broke the big endian buildbots as the CHECK lines contained little
endian data but -triple bpf uses the host endian.

llvm-svn: 313281
 2017-09-14 17:55:50 +00:00
Yonghong Song 06ff655e59 bpf: Add BPF AsmParser support in LLVM 
Reviewed-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
llvm-svn: 313055
 2017-09-12 17:55:23 +00:00