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powerpc/bpf: Implement extended BPF on PPC32
Implement Extended Berkeley Packet Filter on Powerpc 32 Test result with test_bpf module: test_bpf: Summary: 378 PASSED, 0 FAILED, [354/366 JIT'ed] Registers mapping: [BPF_REG_0] = r11-r12 /* function arguments */ [BPF_REG_1] = r3-r4 [BPF_REG_2] = r5-r6 [BPF_REG_3] = r7-r8 [BPF_REG_4] = r9-r10 [BPF_REG_5] = r21-r22 (Args 9 and 10 come in via the stack) /* non volatile registers */ [BPF_REG_6] = r23-r24 [BPF_REG_7] = r25-r26 [BPF_REG_8] = r27-r28 [BPF_REG_9] = r29-r30 /* frame pointer aka BPF_REG_10 */ [BPF_REG_FP] = r17-r18 /* eBPF jit internal registers */ [BPF_REG_AX] = r19-r20 [TMP_REG] = r31 As PPC32 doesn't have a redzone in the stack, a stack frame must always be set in order to host at least the tail count counter. The stack frame remains for tail calls, it is set by the first callee and freed by the last callee. r0 is used as temporary register as much as possible. It is referenced directly in the code in order to avoid misusing it, because some instructions interpret it as value 0 instead of register r0 (ex: addi, addis, stw, lwz, ...) The following operations are not implemented: case BPF_ALU64 | BPF_DIV | BPF_X: /* dst /= src */ case BPF_ALU64 | BPF_MOD | BPF_X: /* dst %= src */ case BPF_STX | BPF_XADD | BPF_DW: /* *(u64 *)(dst + off) += src */ The following operations are only implemented for power of two constants: case BPF_ALU64 | BPF_MOD | BPF_K: /* dst %= imm */ case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */ Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/61d8b149176ddf99e7d5cef0b6dc1598583ca202.1616430991.git.christophe.leroy@csgroup.eu
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5 changed files with 1076 additions and 3 deletions
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@ -64,6 +64,7 @@ two flavors of JITs, the newer eBPF JIT currently supported on:
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- arm64
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- arm32
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- ppc64
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- ppc32
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- sparc64
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- mips64
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- s390x
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@ -73,7 +74,6 @@ two flavors of JITs, the newer eBPF JIT currently supported on:
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And the older cBPF JIT supported on the following archs:
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- mips
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- ppc
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- sparc
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eBPF JITs are a superset of cBPF JITs, meaning the kernel will
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@ -202,7 +202,7 @@ config PPC
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select HAVE_DEBUG_STACKOVERFLOW
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select HAVE_DYNAMIC_FTRACE
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select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
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select HAVE_EBPF_JIT if PPC64
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select HAVE_EBPF_JIT
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select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
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select HAVE_FAST_GUP
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select HAVE_FTRACE_MCOUNT_RECORD
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@ -2,4 +2,4 @@
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#
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# Arch-specific network modules
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#
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obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o bpf_jit_comp64.o
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obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o bpf_jit_comp$(BITS).o
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@ -42,6 +42,10 @@
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EMIT(PPC_RAW_ORI(d, d, IMM_L(i))); \
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} } while(0)
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#ifdef CONFIG_PPC32
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#define PPC_EX32(r, i) EMIT(PPC_RAW_LI((r), (i) < 0 ? -1 : 0))
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#endif
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#define PPC_LI64(d, i) do { \
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if ((long)(i) >= -2147483648 && \
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(long)(i) < 2147483648) \
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1069
arch/powerpc/net/bpf_jit_comp32.c
Normal file
1069
arch/powerpc/net/bpf_jit_comp32.c
Normal file
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