Hari Bathini 2d9206b227 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		2022-06-29 19:37:08 +10:00
..
Makefile	powerpc/bpf: Implement extended BPF on PPC32	2021-04-03 21:22:21 +11:00
bpf_jit.h	powerpc/inst: Remove PPC_INST_BL	2022-05-22 15:58:27 +10:00
bpf_jit_comp.c	powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2}	2022-05-19 23:11:29 +10:00
bpf_jit_comp32.c	powerpc/bpf/32: Add instructions for atomic_[cmp]xchg	2022-06-29 19:37:08 +10:00
bpf_jit_comp64.c	powerpc/bpf/64: Add instructions for atomic_[cmp]xchg	2022-06-29 19:37:08 +10:00