diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2022-06-10 21:25:52 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-06-29 19:37:08 +1000 |
| commit | 2d9206b227434912582049c49af1085660fa1e50 (patch) | |
| tree | 9e649d9d9f580e62027eaf4856d52853a815eedc /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | aea7ef8a82c0ea13ff20b65ff2edf8a38a17eda8 (diff) | |
powerpc/bpf/32: Add instructions for atomic_[cmp]xchg
This adds two atomic opcodes BPF_XCHG and BPF_CMPXCHG on ppc32, both
of which include the BPF_FETCH flag. The kernel's atomic_cmpxchg
operation fundamentally has 3 operands, but we only have two register
fields. Therefore the operand we compare against (the kernel's API
calls it 'old') is hard-coded to be BPF_REG_R0. Also, kernel's
atomic_cmpxchg returns the previous value at dst_reg + off. JIT the
same for BPF too with return value put in BPF_REG_0.
BPF_REG_R0 = atomic_cmpxchg(dst_reg + off, BPF_REG_R0, src_reg);
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> (ppc64le)
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610155552.25892-6-hbathini@linux.ibm.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions