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powerpc/ebpf/jit: Implement JIT compiler for extended BPF
PPC64 eBPF JIT compiler. Enable with: echo 1 > /proc/sys/net/core/bpf_jit_enable or echo 2 > /proc/sys/net/core/bpf_jit_enable ... to see the generated JIT code. This can further be processed with tools/net/bpf_jit_disasm. With CONFIG_TEST_BPF=m and 'modprobe test_bpf': test_bpf: Summary: 305 PASSED, 0 FAILED, [297/297 JIT'ed] ... on both ppc64 BE and LE. The details of the approach are documented through various comments in the code. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
Michael Ellerman
parent
6ac0ba5a4f
commit
156d0e290e
@ -128,7 +128,8 @@ config PPC
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select IRQ_FORCED_THREADING
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select HAVE_RCU_TABLE_FREE if SMP
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select HAVE_SYSCALL_TRACEPOINTS
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select HAVE_CBPF_JIT
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select HAVE_CBPF_JIT if !PPC64
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select HAVE_EBPF_JIT if PPC64
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select HAVE_ARCH_JUMP_LABEL
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select ARCH_HAVE_NMI_SAFE_CMPXCHG
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select ARCH_HAS_GCOV_PROFILE_ALL
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@ -36,11 +36,13 @@
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#define PPC_MIN_STKFRM 112
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#ifdef __BIG_ENDIAN__
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#define LHZX_BE stringify_in_c(lhzx)
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#define LWZX_BE stringify_in_c(lwzx)
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#define LDX_BE stringify_in_c(ldx)
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#define STWX_BE stringify_in_c(stwx)
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#define STDX_BE stringify_in_c(stdx)
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#else
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#define LHZX_BE stringify_in_c(lhbrx)
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#define LWZX_BE stringify_in_c(lwbrx)
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#define LDX_BE stringify_in_c(ldbrx)
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#define STWX_BE stringify_in_c(stwbrx)
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@ -142,9 +142,11 @@
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#define PPC_INST_ISEL 0x7c00001e
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#define PPC_INST_ISEL_MASK 0xfc00003e
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#define PPC_INST_LDARX 0x7c0000a8
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#define PPC_INST_STDCX 0x7c0001ad
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#define PPC_INST_LSWI 0x7c0004aa
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#define PPC_INST_LSWX 0x7c00042a
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#define PPC_INST_LWARX 0x7c000028
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#define PPC_INST_STWCX 0x7c00012d
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#define PPC_INST_LWSYNC 0x7c2004ac
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#define PPC_INST_SYNC 0x7c0004ac
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#define PPC_INST_SYNC_MASK 0xfc0007fe
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@ -211,8 +213,11 @@
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#define PPC_INST_LBZ 0x88000000
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#define PPC_INST_LD 0xe8000000
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#define PPC_INST_LHZ 0xa0000000
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#define PPC_INST_LHBRX 0x7c00062c
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#define PPC_INST_LWZ 0x80000000
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#define PPC_INST_LHBRX 0x7c00062c
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#define PPC_INST_LDBRX 0x7c000428
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#define PPC_INST_STB 0x98000000
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#define PPC_INST_STH 0xb0000000
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#define PPC_INST_STD 0xf8000000
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#define PPC_INST_STDU 0xf8000001
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#define PPC_INST_STW 0x90000000
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@ -221,22 +226,34 @@
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#define PPC_INST_MTLR 0x7c0803a6
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#define PPC_INST_CMPWI 0x2c000000
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#define PPC_INST_CMPDI 0x2c200000
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#define PPC_INST_CMPW 0x7c000000
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#define PPC_INST_CMPD 0x7c200000
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#define PPC_INST_CMPLW 0x7c000040
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#define PPC_INST_CMPLD 0x7c200040
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#define PPC_INST_CMPLWI 0x28000000
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#define PPC_INST_CMPLDI 0x28200000
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#define PPC_INST_ADDI 0x38000000
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#define PPC_INST_ADDIS 0x3c000000
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#define PPC_INST_ADD 0x7c000214
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#define PPC_INST_SUB 0x7c000050
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#define PPC_INST_BLR 0x4e800020
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#define PPC_INST_BLRL 0x4e800021
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#define PPC_INST_MULLD 0x7c0001d2
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#define PPC_INST_MULLW 0x7c0001d6
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#define PPC_INST_MULHWU 0x7c000016
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#define PPC_INST_MULLI 0x1c000000
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#define PPC_INST_DIVWU 0x7c000396
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#define PPC_INST_DIVD 0x7c0003d2
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#define PPC_INST_RLWINM 0x54000000
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#define PPC_INST_RLWIMI 0x50000000
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#define PPC_INST_RLDICL 0x78000000
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#define PPC_INST_RLDICR 0x78000004
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#define PPC_INST_SLW 0x7c000030
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#define PPC_INST_SLD 0x7c000036
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#define PPC_INST_SRW 0x7c000430
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#define PPC_INST_SRD 0x7c000436
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#define PPC_INST_SRAD 0x7c000634
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#define PPC_INST_SRADI 0x7c000674
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#define PPC_INST_AND 0x7c000038
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#define PPC_INST_ANDDOT 0x7c000039
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#define PPC_INST_OR 0x7c000378
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@ -247,6 +264,7 @@
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#define PPC_INST_XORI 0x68000000
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#define PPC_INST_XORIS 0x6c000000
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#define PPC_INST_NEG 0x7c0000d0
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#define PPC_INST_EXTSW 0x7c0007b4
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#define PPC_INST_BRANCH 0x48000000
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#define PPC_INST_BRANCH_COND 0x40800000
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#define PPC_INST_LBZCIX 0x7c0006aa
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@ -1,4 +1,8 @@
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#
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# Arch-specific network modules
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#
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ifeq ($(CONFIG_PPC64),y)
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obj-$(CONFIG_BPF_JIT) += bpf_jit_asm64.o bpf_jit_comp64.o
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else
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obj-$(CONFIG_BPF_JIT) += bpf_jit_asm.o bpf_jit_comp.o
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endif
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@ -2,6 +2,7 @@
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* bpf_jit.h: BPF JIT compiler for PPC
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*
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* Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation
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* 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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@ -13,7 +14,9 @@
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_PPC64
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#include <asm/types.h>
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#ifdef PPC64_ELF_ABI_v1
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#define FUNCTION_DESCR_SIZE 24
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#else
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#define FUNCTION_DESCR_SIZE 0
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@ -52,6 +55,10 @@
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___PPC_RA(base) | IMM_L(i))
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#define PPC_STWU(r, base, i) EMIT(PPC_INST_STWU | ___PPC_RS(r) | \
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___PPC_RA(base) | IMM_L(i))
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#define PPC_STH(r, base, i) EMIT(PPC_INST_STH | ___PPC_RS(r) | \
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___PPC_RA(base) | IMM_L(i))
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#define PPC_STB(r, base, i) EMIT(PPC_INST_STB | ___PPC_RS(r) | \
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___PPC_RA(base) | IMM_L(i))
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#define PPC_LBZ(r, base, i) EMIT(PPC_INST_LBZ | ___PPC_RT(r) | \
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___PPC_RA(base) | IMM_L(i))
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@ -63,6 +70,19 @@
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___PPC_RA(base) | IMM_L(i))
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#define PPC_LHBRX(r, base, b) EMIT(PPC_INST_LHBRX | ___PPC_RT(r) | \
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___PPC_RA(base) | ___PPC_RB(b))
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#define PPC_LDBRX(r, base, b) EMIT(PPC_INST_LDBRX | ___PPC_RT(r) | \
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___PPC_RA(base) | ___PPC_RB(b))
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#define PPC_BPF_LDARX(t, a, b, eh) EMIT(PPC_INST_LDARX | ___PPC_RT(t) | \
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___PPC_RA(a) | ___PPC_RB(b) | \
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__PPC_EH(eh))
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#define PPC_BPF_LWARX(t, a, b, eh) EMIT(PPC_INST_LWARX | ___PPC_RT(t) | \
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___PPC_RA(a) | ___PPC_RB(b) | \
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__PPC_EH(eh))
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#define PPC_BPF_STWCX(s, a, b) EMIT(PPC_INST_STWCX | ___PPC_RS(s) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_BPF_STDCX(s, a, b) EMIT(PPC_INST_STDCX | ___PPC_RS(s) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#ifdef CONFIG_PPC64
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#define PPC_BPF_LL(r, base, i) do { PPC_LD(r, base, i); } while(0)
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@ -76,14 +96,23 @@
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#define PPC_CMPWI(a, i) EMIT(PPC_INST_CMPWI | ___PPC_RA(a) | IMM_L(i))
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#define PPC_CMPDI(a, i) EMIT(PPC_INST_CMPDI | ___PPC_RA(a) | IMM_L(i))
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#define PPC_CMPW(a, b) EMIT(PPC_INST_CMPW | ___PPC_RA(a) | \
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___PPC_RB(b))
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#define PPC_CMPD(a, b) EMIT(PPC_INST_CMPD | ___PPC_RA(a) | \
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___PPC_RB(b))
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#define PPC_CMPLWI(a, i) EMIT(PPC_INST_CMPLWI | ___PPC_RA(a) | IMM_L(i))
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#define PPC_CMPLDI(a, i) EMIT(PPC_INST_CMPLDI | ___PPC_RA(a) | IMM_L(i))
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#define PPC_CMPLW(a, b) EMIT(PPC_INST_CMPLW | ___PPC_RA(a) | \
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___PPC_RB(b))
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#define PPC_CMPLD(a, b) EMIT(PPC_INST_CMPLD | ___PPC_RA(a) | \
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___PPC_RB(b))
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#define PPC_SUB(d, a, b) EMIT(PPC_INST_SUB | ___PPC_RT(d) | \
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___PPC_RB(a) | ___PPC_RA(b))
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#define PPC_ADD(d, a, b) EMIT(PPC_INST_ADD | ___PPC_RT(d) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_MULD(d, a, b) EMIT(PPC_INST_MULLD | ___PPC_RT(d) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_MULW(d, a, b) EMIT(PPC_INST_MULLW | ___PPC_RT(d) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_MULHWU(d, a, b) EMIT(PPC_INST_MULHWU | ___PPC_RT(d) | \
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@ -92,6 +121,8 @@
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___PPC_RA(a) | IMM_L(i))
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#define PPC_DIVWU(d, a, b) EMIT(PPC_INST_DIVWU | ___PPC_RT(d) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_DIVD(d, a, b) EMIT(PPC_INST_DIVD | ___PPC_RT(d) | \
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___PPC_RA(a) | ___PPC_RB(b))
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#define PPC_AND(d, a, b) EMIT(PPC_INST_AND | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(b))
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#define PPC_ANDI(d, a, i) EMIT(PPC_INST_ANDI | ___PPC_RA(d) | \
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@ -100,6 +131,7 @@
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___PPC_RS(a) | ___PPC_RB(b))
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#define PPC_OR(d, a, b) EMIT(PPC_INST_OR | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(b))
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#define PPC_MR(d, a) PPC_OR(d, a, a)
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#define PPC_ORI(d, a, i) EMIT(PPC_INST_ORI | ___PPC_RA(d) | \
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___PPC_RS(a) | IMM_L(i))
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#define PPC_ORIS(d, a, i) EMIT(PPC_INST_ORIS | ___PPC_RA(d) | \
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@ -110,13 +142,30 @@
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___PPC_RS(a) | IMM_L(i))
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#define PPC_XORIS(d, a, i) EMIT(PPC_INST_XORIS | ___PPC_RA(d) | \
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___PPC_RS(a) | IMM_L(i))
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#define PPC_EXTSW(d, a) EMIT(PPC_INST_EXTSW | ___PPC_RA(d) | \
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___PPC_RS(a))
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#define PPC_SLW(d, a, s) EMIT(PPC_INST_SLW | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(s))
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#define PPC_SLD(d, a, s) EMIT(PPC_INST_SLD | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(s))
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#define PPC_SRW(d, a, s) EMIT(PPC_INST_SRW | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(s))
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#define PPC_SRD(d, a, s) EMIT(PPC_INST_SRD | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(s))
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#define PPC_SRAD(d, a, s) EMIT(PPC_INST_SRAD | ___PPC_RA(d) | \
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___PPC_RS(a) | ___PPC_RB(s))
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#define PPC_SRADI(d, a, i) EMIT(PPC_INST_SRADI | ___PPC_RA(d) | \
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___PPC_RS(a) | __PPC_SH(i) | \
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(((i) & 0x20) >> 4))
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#define PPC_RLWINM(d, a, i, mb, me) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \
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___PPC_RS(a) | __PPC_SH(i) | \
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__PPC_MB(mb) | __PPC_ME(me))
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#define PPC_RLWIMI(d, a, i, mb, me) EMIT(PPC_INST_RLWIMI | ___PPC_RA(d) | \
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___PPC_RS(a) | __PPC_SH(i) | \
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__PPC_MB(mb) | __PPC_ME(me))
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#define PPC_RLDICL(d, a, i, mb) EMIT(PPC_INST_RLDICL | ___PPC_RA(d) | \
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___PPC_RS(a) | __PPC_SH(i) | \
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__PPC_MB64(mb) | (((i) & 0x20) >> 4))
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#define PPC_RLDICR(d, a, i, me) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \
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___PPC_RS(a) | __PPC_SH(i) | \
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__PPC_ME64(me) | (((i) & 0x20) >> 4))
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@ -127,6 +176,8 @@
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#define PPC_SRWI(d, a, i) PPC_RLWINM(d, a, 32-(i), i, 31)
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/* sldi = rldicr Rx, Ry, n, 63-n */
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#define PPC_SLDI(d, a, i) PPC_RLDICR(d, a, i, 63-(i))
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/* sldi = rldicl Rx, Ry, 64-n, n */
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#define PPC_SRDI(d, a, i) PPC_RLDICL(d, a, 64-(i), i)
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#define PPC_NEG(d, a) EMIT(PPC_INST_NEG | ___PPC_RT(d) | ___PPC_RA(a))
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102
arch/powerpc/net/bpf_jit64.h
Normal file
102
arch/powerpc/net/bpf_jit64.h
Normal file
@ -0,0 +1,102 @@
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/*
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* bpf_jit64.h: BPF JIT compiler for PPC64
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*
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* Copyright 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
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* IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#ifndef _BPF_JIT64_H
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#define _BPF_JIT64_H
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#include "bpf_jit.h"
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/*
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* Stack layout:
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*
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* [ prev sp ] <-------------
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* [ nv gpr save area ] 8*8 |
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* fp (r31) --> [ ebpf stack space ] 512 |
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* [ local/tmp var space ] 16 |
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* [ frame header ] 32/112 |
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* sp (r1) ---> [ stack pointer ] --------------
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*/
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/* for bpf JIT code internal usage */
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#define BPF_PPC_STACK_LOCALS 16
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/* for gpr non volatile registers BPG_REG_6 to 10, plus skb cache registers */
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#define BPF_PPC_STACK_SAVE (8*8)
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/* Ensure this is quadword aligned */
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#define BPF_PPC_STACKFRAME (STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS + \
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MAX_BPF_STACK + BPF_PPC_STACK_SAVE)
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#ifndef __ASSEMBLY__
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/* BPF register usage */
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#define SKB_HLEN_REG (MAX_BPF_REG + 0)
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#define SKB_DATA_REG (MAX_BPF_REG + 1)
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#define TMP_REG_1 (MAX_BPF_REG + 2)
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#define TMP_REG_2 (MAX_BPF_REG + 3)
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/* BPF to ppc register mappings */
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static const int b2p[] = {
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/* function return value */
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[BPF_REG_0] = 8,
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/* function arguments */
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[BPF_REG_1] = 3,
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[BPF_REG_2] = 4,
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[BPF_REG_3] = 5,
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[BPF_REG_4] = 6,
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[BPF_REG_5] = 7,
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/* non volatile registers */
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[BPF_REG_6] = 27,
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[BPF_REG_7] = 28,
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[BPF_REG_8] = 29,
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[BPF_REG_9] = 30,
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/* frame pointer aka BPF_REG_10 */
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[BPF_REG_FP] = 31,
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/* eBPF jit internal registers */
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[SKB_HLEN_REG] = 25,
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[SKB_DATA_REG] = 26,
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[TMP_REG_1] = 9,
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[TMP_REG_2] = 10
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};
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/* Assembly helpers */
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#define DECLARE_LOAD_FUNC(func) u64 func(u64 r3, u64 r4); \
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u64 func##_negative_offset(u64 r3, u64 r4); \
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u64 func##_positive_offset(u64 r3, u64 r4);
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DECLARE_LOAD_FUNC(sk_load_word);
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DECLARE_LOAD_FUNC(sk_load_half);
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DECLARE_LOAD_FUNC(sk_load_byte);
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#define CHOOSE_LOAD_FUNC(imm, func) \
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(imm < 0 ? \
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(imm >= SKF_LL_OFF ? func##_negative_offset : func) : \
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func##_positive_offset)
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#define SEEN_FUNC 0x1000 /* might call external helpers */
|
||||
#define SEEN_STACK 0x2000 /* uses BPF stack */
|
||||
#define SEEN_SKB 0x4000 /* uses sk_buff */
|
||||
|
||||
struct codegen_context {
|
||||
/*
|
||||
* This is used to track register usage as well
|
||||
* as calls to external helpers.
|
||||
* - register usage is tracked with corresponding
|
||||
* bits (r3-r10 and r25-r31)
|
||||
* - rest of the bits can be used to track other
|
||||
* things -- for now, we use bits 16 to 23
|
||||
* encoded in SEEN_* macros above
|
||||
*/
|
||||
unsigned int seen;
|
||||
unsigned int idx;
|
||||
};
|
||||
|
||||
#endif /* !__ASSEMBLY__ */
|
||||
|
||||
#endif
|
||||
180
arch/powerpc/net/bpf_jit_asm64.S
Normal file
180
arch/powerpc/net/bpf_jit_asm64.S
Normal file
@ -0,0 +1,180 @@
|
||||
/*
|
||||
* bpf_jit_asm64.S: Packet/header access helper functions
|
||||
* for PPC64 BPF compiler.
|
||||
*
|
||||
* Copyright 2016, Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
|
||||
* IBM Corporation
|
||||
*
|
||||
* Based on bpf_jit_asm.S by Matt Evans
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; version 2
|
||||
* of the License.
|
||||
*/
|
||||
|
||||
#include <asm/ppc_asm.h>
|
||||
#include <asm/ptrace.h>
|
||||
#include "bpf_jit64.h"
|
||||
|
||||
/*
|
||||
* All of these routines are called directly from generated code,
|
||||
* with the below register usage:
|
||||
* r27 skb pointer (ctx)
|
||||
* r25 skb header length
|
||||
* r26 skb->data pointer
|
||||
* r4 offset
|
||||
*
|
||||
* Result is passed back in:
|
||||
* r8 data read in host endian format (accumulator)
|
||||
*
|
||||
* r9 is used as a temporary register
|
||||
*/
|
||||
|
||||
#define r_skb r27
|
||||
#define r_hlen r25
|
||||
#define r_data r26
|
||||
#define r_off r4
|
||||
#define r_val r8
|
||||
#define r_tmp r9
|
||||
|
||||
_GLOBAL_TOC(sk_load_word)
|
||||
cmpdi r_off, 0
|
||||
blt bpf_slow_path_word_neg
|
||||
b sk_load_word_positive_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_word_positive_offset)
|
||||
/* Are we accessing past headlen? */
|
||||
subi r_tmp, r_hlen, 4
|
||||
cmpd r_tmp, r_off
|
||||
blt bpf_slow_path_word
|
||||
/* Nope, just hitting the header. cr0 here is eq or gt! */
|
||||
LWZX_BE r_val, r_data, r_off
|
||||
blr /* Return success, cr0 != LT */
|
||||
|
||||
_GLOBAL_TOC(sk_load_half)
|
||||
cmpdi r_off, 0
|
||||
blt bpf_slow_path_half_neg
|
||||
b sk_load_half_positive_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_half_positive_offset)
|
||||
subi r_tmp, r_hlen, 2
|
||||
cmpd r_tmp, r_off
|
||||
blt bpf_slow_path_half
|
||||
LHZX_BE r_val, r_data, r_off
|
||||
blr
|
||||
|
||||
_GLOBAL_TOC(sk_load_byte)
|
||||
cmpdi r_off, 0
|
||||
blt bpf_slow_path_byte_neg
|
||||
b sk_load_byte_positive_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_byte_positive_offset)
|
||||
cmpd r_hlen, r_off
|
||||
ble bpf_slow_path_byte
|
||||
lbzx r_val, r_data, r_off
|
||||
blr
|
||||
|
||||
/*
|
||||
* Call out to skb_copy_bits:
|
||||
* Allocate a new stack frame here to remain ABI-compliant in
|
||||
* stashing LR.
|
||||
*/
|
||||
#define bpf_slow_path_common(SIZE) \
|
||||
mflr r0; \
|
||||
std r0, PPC_LR_STKOFF(r1); \
|
||||
stdu r1, -(STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS)(r1); \
|
||||
mr r3, r_skb; \
|
||||
/* r4 = r_off as passed */ \
|
||||
addi r5, r1, STACK_FRAME_MIN_SIZE; \
|
||||
li r6, SIZE; \
|
||||
bl skb_copy_bits; \
|
||||
nop; \
|
||||
/* save r5 */ \
|
||||
addi r5, r1, STACK_FRAME_MIN_SIZE; \
|
||||
/* r3 = 0 on success */ \
|
||||
addi r1, r1, STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS; \
|
||||
ld r0, PPC_LR_STKOFF(r1); \
|
||||
mtlr r0; \
|
||||
cmpdi r3, 0; \
|
||||
blt bpf_error; /* cr0 = LT */
|
||||
|
||||
bpf_slow_path_word:
|
||||
bpf_slow_path_common(4)
|
||||
/* Data value is on stack, and cr0 != LT */
|
||||
LWZX_BE r_val, 0, r5
|
||||
blr
|
||||
|
||||
bpf_slow_path_half:
|
||||
bpf_slow_path_common(2)
|
||||
LHZX_BE r_val, 0, r5
|
||||
blr
|
||||
|
||||
bpf_slow_path_byte:
|
||||
bpf_slow_path_common(1)
|
||||
lbzx r_val, 0, r5
|
||||
blr
|
||||
|
||||
/*
|
||||
* Call out to bpf_internal_load_pointer_neg_helper
|
||||
*/
|
||||
#define sk_negative_common(SIZE) \
|
||||
mflr r0; \
|
||||
std r0, PPC_LR_STKOFF(r1); \
|
||||
stdu r1, -STACK_FRAME_MIN_SIZE(r1); \
|
||||
mr r3, r_skb; \
|
||||
/* r4 = r_off, as passed */ \
|
||||
li r5, SIZE; \
|
||||
bl bpf_internal_load_pointer_neg_helper; \
|
||||
nop; \
|
||||
addi r1, r1, STACK_FRAME_MIN_SIZE; \
|
||||
ld r0, PPC_LR_STKOFF(r1); \
|
||||
mtlr r0; \
|
||||
/* R3 != 0 on success */ \
|
||||
cmpldi r3, 0; \
|
||||
beq bpf_error_slow; /* cr0 = EQ */
|
||||
|
||||
bpf_slow_path_word_neg:
|
||||
lis r_tmp, -32 /* SKF_LL_OFF */
|
||||
cmpd r_off, r_tmp /* addr < SKF_* */
|
||||
blt bpf_error /* cr0 = LT */
|
||||
b sk_load_word_negative_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_word_negative_offset)
|
||||
sk_negative_common(4)
|
||||
LWZX_BE r_val, 0, r3
|
||||
blr
|
||||
|
||||
bpf_slow_path_half_neg:
|
||||
lis r_tmp, -32 /* SKF_LL_OFF */
|
||||
cmpd r_off, r_tmp /* addr < SKF_* */
|
||||
blt bpf_error /* cr0 = LT */
|
||||
b sk_load_half_negative_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_half_negative_offset)
|
||||
sk_negative_common(2)
|
||||
LHZX_BE r_val, 0, r3
|
||||
blr
|
||||
|
||||
bpf_slow_path_byte_neg:
|
||||
lis r_tmp, -32 /* SKF_LL_OFF */
|
||||
cmpd r_off, r_tmp /* addr < SKF_* */
|
||||
blt bpf_error /* cr0 = LT */
|
||||
b sk_load_byte_negative_offset
|
||||
|
||||
_GLOBAL_TOC(sk_load_byte_negative_offset)
|
||||
sk_negative_common(1)
|
||||
lbzx r_val, 0, r3
|
||||
blr
|
||||
|
||||
bpf_error_slow:
|
||||
/* fabricate a cr0 = lt */
|
||||
li r_tmp, -1
|
||||
cmpdi r_tmp, 0
|
||||
bpf_error:
|
||||
/*
|
||||
* Entered with cr0 = lt
|
||||
* Generated code will 'blt epilogue', returning 0.
|
||||
*/
|
||||
li r_val, 0
|
||||
blr
|
||||
954
arch/powerpc/net/bpf_jit_comp64.c
Normal file
954
arch/powerpc/net/bpf_jit_comp64.c
Normal file
@ -0,0 +1,954 @@
|
||||
/*
|
||||
* bpf_jit_comp64.c: eBPF JIT compiler
|
||||
*
|
||||
* Copyright 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
|
||||
* IBM Corporation
|
||||
*
|
||||
* Based on the powerpc classic BPF JIT compiler by Matt Evans
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; version 2
|
||||
* of the License.
|
||||
*/
|
||||
#include <linux/moduleloader.h>
|
||||
#include <asm/cacheflush.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/filter.h>
|
||||
#include <linux/if_vlan.h>
|
||||
#include <asm/kprobes.h>
|
||||
|
||||
#include "bpf_jit64.h"
|
||||
|
||||
int bpf_jit_enable __read_mostly;
|
||||
|
||||
static void bpf_jit_fill_ill_insns(void *area, unsigned int size)
|
||||
{
|
||||
int *p = area;
|
||||
|
||||
/* Fill whole space with trap instructions */
|
||||
while (p < (int *)((char *)area + size))
|
||||
*p++ = BREAKPOINT_INSTRUCTION;
|
||||
}
|
||||
|
||||
static inline void bpf_flush_icache(void *start, void *end)
|
||||
{
|
||||
smp_wmb();
|
||||
flush_icache_range((unsigned long)start, (unsigned long)end);
|
||||
}
|
||||
|
||||
static inline bool bpf_is_seen_register(struct codegen_context *ctx, int i)
|
||||
{
|
||||
return (ctx->seen & (1 << (31 - b2p[i])));
|
||||
}
|
||||
|
||||
static inline void bpf_set_seen_register(struct codegen_context *ctx, int i)
|
||||
{
|
||||
ctx->seen |= (1 << (31 - b2p[i]));
|
||||
}
|
||||
|
||||
static inline bool bpf_has_stack_frame(struct codegen_context *ctx)
|
||||
{
|
||||
/*
|
||||
* We only need a stack frame if:
|
||||
* - we call other functions (kernel helpers), or
|
||||
* - the bpf program uses its stack area
|
||||
* The latter condition is deduced from the usage of BPF_REG_FP
|
||||
*/
|
||||
return ctx->seen & SEEN_FUNC || bpf_is_seen_register(ctx, BPF_REG_FP);
|
||||
}
|
||||
|
||||
static void bpf_jit_emit_skb_loads(u32 *image, struct codegen_context *ctx)
|
||||
{
|
||||
/*
|
||||
* Load skb->len and skb->data_len
|
||||
* r3 points to skb
|
||||
*/
|
||||
PPC_LWZ(b2p[SKB_HLEN_REG], 3, offsetof(struct sk_buff, len));
|
||||
PPC_LWZ(b2p[TMP_REG_1], 3, offsetof(struct sk_buff, data_len));
|
||||
/* header_len = len - data_len */
|
||||
PPC_SUB(b2p[SKB_HLEN_REG], b2p[SKB_HLEN_REG], b2p[TMP_REG_1]);
|
||||
|
||||
/* skb->data pointer */
|
||||
PPC_BPF_LL(b2p[SKB_DATA_REG], 3, offsetof(struct sk_buff, data));
|
||||
}
|
||||
|
||||
static void bpf_jit_emit_func_call(u32 *image, struct codegen_context *ctx, u64 func)
|
||||
{
|
||||
#ifdef PPC64_ELF_ABI_v1
|
||||
/* func points to the function descriptor */
|
||||
PPC_LI64(b2p[TMP_REG_2], func);
|
||||
/* Load actual entry point from function descriptor */
|
||||
PPC_BPF_LL(b2p[TMP_REG_1], b2p[TMP_REG_2], 0);
|
||||
/* ... and move it to LR */
|
||||
PPC_MTLR(b2p[TMP_REG_1]);
|
||||
/*
|
||||
* Load TOC from function descriptor at offset 8.
|
||||
* We can clobber r2 since we get called through a
|
||||
* function pointer (so caller will save/restore r2)
|
||||
* and since we don't use a TOC ourself.
|
||||
*/
|
||||
PPC_BPF_LL(2, b2p[TMP_REG_2], 8);
|
||||
#else
|
||||
/* We can clobber r12 */
|
||||
PPC_FUNC_ADDR(12, func);
|
||||
PPC_MTLR(12);
|
||||
#endif
|
||||
PPC_BLRL();
|
||||
}
|
||||
|
||||
static void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
|
||||
{
|
||||
int i;
|
||||
bool new_stack_frame = bpf_has_stack_frame(ctx);
|
||||
|
||||
if (new_stack_frame) {
|
||||
/*
|
||||
* We need a stack frame, but we don't necessarily need to
|
||||
* save/restore LR unless we call other functions
|
||||
*/
|
||||
if (ctx->seen & SEEN_FUNC) {
|
||||
EMIT(PPC_INST_MFLR | __PPC_RT(R0));
|
||||
PPC_BPF_STL(0, 1, PPC_LR_STKOFF);
|
||||
}
|
||||
|
||||
PPC_BPF_STLU(1, 1, -BPF_PPC_STACKFRAME);
|
||||
}
|
||||
|
||||
/*
|
||||
* Back up non-volatile regs -- BPF registers 6-10
|
||||
* If we haven't created our own stack frame, we save these
|
||||
* in the protected zone below the previous stack frame
|
||||
*/
|
||||
for (i = BPF_REG_6; i <= BPF_REG_10; i++)
|
||||
if (bpf_is_seen_register(ctx, i))
|
||||
PPC_BPF_STL(b2p[i], 1,
|
||||
(new_stack_frame ? BPF_PPC_STACKFRAME : 0) -
|
||||
(8 * (32 - b2p[i])));
|
||||
|
||||
/*
|
||||
* Save additional non-volatile regs if we cache skb
|
||||
* Also, setup skb data
|
||||
*/
|
||||
if (ctx->seen & SEEN_SKB) {
|
||||
PPC_BPF_STL(b2p[SKB_HLEN_REG], 1,
|
||||
BPF_PPC_STACKFRAME - (8 * (32 - b2p[SKB_HLEN_REG])));
|
||||
PPC_BPF_STL(b2p[SKB_DATA_REG], 1,
|
||||
BPF_PPC_STACKFRAME - (8 * (32 - b2p[SKB_DATA_REG])));
|
||||
bpf_jit_emit_skb_loads(image, ctx);
|
||||
}
|
||||
|
||||
/* Setup frame pointer to point to the bpf stack area */
|
||||
if (bpf_is_seen_register(ctx, BPF_REG_FP))
|
||||
PPC_ADDI(b2p[BPF_REG_FP], 1,
|
||||
BPF_PPC_STACKFRAME - BPF_PPC_STACK_SAVE);
|
||||
}
|
||||
|
||||
static void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)
|
||||
{
|
||||
int i;
|
||||
bool new_stack_frame = bpf_has_stack_frame(ctx);
|
||||
|
||||
/* Move result to r3 */
|
||||
PPC_MR(3, b2p[BPF_REG_0]);
|
||||
|
||||
/* Restore NVRs */
|
||||
for (i = BPF_REG_6; i <= BPF_REG_10; i++)
|
||||
if (bpf_is_seen_register(ctx, i))
|
||||
PPC_BPF_LL(b2p[i], 1,
|
||||
(new_stack_frame ? BPF_PPC_STACKFRAME : 0) -
|
||||
(8 * (32 - b2p[i])));
|
||||
|
||||
/* Restore non-volatile registers used for skb cache */
|
||||
if (ctx->seen & SEEN_SKB) {
|
||||
PPC_BPF_LL(b2p[SKB_HLEN_REG], 1,
|
||||
BPF_PPC_STACKFRAME - (8 * (32 - b2p[SKB_HLEN_REG])));
|
||||
PPC_BPF_LL(b2p[SKB_DATA_REG], 1,
|
||||
BPF_PPC_STACKFRAME - (8 * (32 - b2p[SKB_DATA_REG])));
|
||||
}
|
||||
|
||||
/* Tear down our stack frame */
|
||||
if (new_stack_frame) {
|
||||
PPC_ADDI(1, 1, BPF_PPC_STACKFRAME);
|
||||
if (ctx->seen & SEEN_FUNC) {
|
||||
PPC_BPF_LL(0, 1, PPC_LR_STKOFF);
|
||||
PPC_MTLR(0);
|
||||
}
|
||||
}
|
||||
|
||||
PPC_BLR();
|
||||
}
|
||||
|
||||
/* Assemble the body code between the prologue & epilogue */
|
||||
static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
|
||||
struct codegen_context *ctx,
|
||||
u32 *addrs)
|
||||
{
|
||||
const struct bpf_insn *insn = fp->insnsi;
|
||||
int flen = fp->len;
|
||||
int i;
|
||||
|
||||
/* Start of epilogue code - will only be valid 2nd pass onwards */
|
||||
u32 exit_addr = addrs[flen];
|
||||
|
||||
for (i = 0; i < flen; i++) {
|
||||
u32 code = insn[i].code;
|
||||
u32 dst_reg = b2p[insn[i].dst_reg];
|
||||
u32 src_reg = b2p[insn[i].src_reg];
|
||||
s16 off = insn[i].off;
|
||||
s32 imm = insn[i].imm;
|
||||
u64 imm64;
|
||||
u8 *func;
|
||||
u32 true_cond;
|
||||
int stack_local_off;
|
||||
|
||||
/*
|
||||
* addrs[] maps a BPF bytecode address into a real offset from
|
||||
* the start of the body code.
|
||||
*/
|
||||
addrs[i] = ctx->idx * 4;
|
||||
|
||||
/*
|
||||
* As an optimization, we note down which non-volatile registers
|
||||
* are used so that we can only save/restore those in our
|
||||
* prologue and epilogue. We do this here regardless of whether
|
||||
* the actual BPF instruction uses src/dst registers or not
|
||||
* (for instance, BPF_CALL does not use them). The expectation
|
||||
* is that those instructions will have src_reg/dst_reg set to
|
||||
* 0. Even otherwise, we just lose some prologue/epilogue
|
||||
* optimization but everything else should work without
|
||||
* any issues.
|
||||
*/
|
||||
if (dst_reg >= 24 && dst_reg <= 31)
|
||||
bpf_set_seen_register(ctx, insn[i].dst_reg);
|
||||
if (src_reg >= 24 && src_reg <= 31)
|
||||
bpf_set_seen_register(ctx, insn[i].src_reg);
|
||||
|
||||
switch (code) {
|
||||
/*
|
||||
* Arithmetic operations: ADD/SUB/MUL/DIV/MOD/NEG
|
||||
*/
|
||||
case BPF_ALU | BPF_ADD | BPF_X: /* (u32) dst += (u32) src */
|
||||
case BPF_ALU64 | BPF_ADD | BPF_X: /* dst += src */
|
||||
PPC_ADD(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_SUB | BPF_X: /* (u32) dst -= (u32) src */
|
||||
case BPF_ALU64 | BPF_SUB | BPF_X: /* dst -= src */
|
||||
PPC_SUB(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_ADD | BPF_K: /* (u32) dst += (u32) imm */
|
||||
case BPF_ALU | BPF_SUB | BPF_K: /* (u32) dst -= (u32) imm */
|
||||
case BPF_ALU64 | BPF_ADD | BPF_K: /* dst += imm */
|
||||
case BPF_ALU64 | BPF_SUB | BPF_K: /* dst -= imm */
|
||||
if (BPF_OP(code) == BPF_SUB)
|
||||
imm = -imm;
|
||||
if (imm) {
|
||||
if (imm >= -32768 && imm < 32768)
|
||||
PPC_ADDI(dst_reg, dst_reg, IMM_L(imm));
|
||||
else {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_ADD(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
}
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_MUL | BPF_X: /* (u32) dst *= (u32) src */
|
||||
case BPF_ALU64 | BPF_MUL | BPF_X: /* dst *= src */
|
||||
if (BPF_CLASS(code) == BPF_ALU)
|
||||
PPC_MULW(dst_reg, dst_reg, src_reg);
|
||||
else
|
||||
PPC_MULD(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_MUL | BPF_K: /* (u32) dst *= (u32) imm */
|
||||
case BPF_ALU64 | BPF_MUL | BPF_K: /* dst *= imm */
|
||||
if (imm >= -32768 && imm < 32768)
|
||||
PPC_MULI(dst_reg, dst_reg, IMM_L(imm));
|
||||
else {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
if (BPF_CLASS(code) == BPF_ALU)
|
||||
PPC_MULW(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
else
|
||||
PPC_MULD(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_DIV | BPF_X: /* (u32) dst /= (u32) src */
|
||||
case BPF_ALU | BPF_MOD | BPF_X: /* (u32) dst %= (u32) src */
|
||||
PPC_CMPWI(src_reg, 0);
|
||||
PPC_BCC_SHORT(COND_NE, (ctx->idx * 4) + 12);
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_JMP(exit_addr);
|
||||
if (BPF_OP(code) == BPF_MOD) {
|
||||
PPC_DIVWU(b2p[TMP_REG_1], dst_reg, src_reg);
|
||||
PPC_MULW(b2p[TMP_REG_1], src_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
PPC_SUB(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
} else
|
||||
PPC_DIVWU(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU64 | BPF_DIV | BPF_X: /* dst /= src */
|
||||
case BPF_ALU64 | BPF_MOD | BPF_X: /* dst %= src */
|
||||
PPC_CMPDI(src_reg, 0);
|
||||
PPC_BCC_SHORT(COND_NE, (ctx->idx * 4) + 12);
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_JMP(exit_addr);
|
||||
if (BPF_OP(code) == BPF_MOD) {
|
||||
PPC_DIVD(b2p[TMP_REG_1], dst_reg, src_reg);
|
||||
PPC_MULD(b2p[TMP_REG_1], src_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
PPC_SUB(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
} else
|
||||
PPC_DIVD(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU | BPF_MOD | BPF_K: /* (u32) dst %= (u32) imm */
|
||||
case BPF_ALU | BPF_DIV | BPF_K: /* (u32) dst /= (u32) imm */
|
||||
case BPF_ALU64 | BPF_MOD | BPF_K: /* dst %= imm */
|
||||
case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */
|
||||
if (imm == 0)
|
||||
return -EINVAL;
|
||||
else if (imm == 1)
|
||||
goto bpf_alu32_trunc;
|
||||
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
switch (BPF_CLASS(code)) {
|
||||
case BPF_ALU:
|
||||
if (BPF_OP(code) == BPF_MOD) {
|
||||
PPC_DIVWU(b2p[TMP_REG_2], dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
PPC_MULW(b2p[TMP_REG_1],
|
||||
b2p[TMP_REG_1],
|
||||
b2p[TMP_REG_2]);
|
||||
PPC_SUB(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
} else
|
||||
PPC_DIVWU(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
break;
|
||||
case BPF_ALU64:
|
||||
if (BPF_OP(code) == BPF_MOD) {
|
||||
PPC_DIVD(b2p[TMP_REG_2], dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
PPC_MULD(b2p[TMP_REG_1],
|
||||
b2p[TMP_REG_1],
|
||||
b2p[TMP_REG_2]);
|
||||
PPC_SUB(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
} else
|
||||
PPC_DIVD(dst_reg, dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
break;
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_NEG: /* (u32) dst = -dst */
|
||||
case BPF_ALU64 | BPF_NEG: /* dst = -dst */
|
||||
PPC_NEG(dst_reg, dst_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
|
||||
/*
|
||||
* Logical operations: AND/OR/XOR/[A]LSH/[A]RSH
|
||||
*/
|
||||
case BPF_ALU | BPF_AND | BPF_X: /* (u32) dst = dst & src */
|
||||
case BPF_ALU64 | BPF_AND | BPF_X: /* dst = dst & src */
|
||||
PPC_AND(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_AND | BPF_K: /* (u32) dst = dst & imm */
|
||||
case BPF_ALU64 | BPF_AND | BPF_K: /* dst = dst & imm */
|
||||
if (!IMM_H(imm))
|
||||
PPC_ANDI(dst_reg, dst_reg, IMM_L(imm));
|
||||
else {
|
||||
/* Sign-extended */
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_AND(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_OR | BPF_X: /* dst = (u32) dst | (u32) src */
|
||||
case BPF_ALU64 | BPF_OR | BPF_X: /* dst = dst | src */
|
||||
PPC_OR(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_OR | BPF_K:/* dst = (u32) dst | (u32) imm */
|
||||
case BPF_ALU64 | BPF_OR | BPF_K:/* dst = dst | imm */
|
||||
if (imm < 0 && BPF_CLASS(code) == BPF_ALU64) {
|
||||
/* Sign-extended */
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_OR(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
} else {
|
||||
if (IMM_L(imm))
|
||||
PPC_ORI(dst_reg, dst_reg, IMM_L(imm));
|
||||
if (IMM_H(imm))
|
||||
PPC_ORIS(dst_reg, dst_reg, IMM_H(imm));
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_XOR | BPF_X: /* (u32) dst ^= src */
|
||||
case BPF_ALU64 | BPF_XOR | BPF_X: /* dst ^= src */
|
||||
PPC_XOR(dst_reg, dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_XOR | BPF_K: /* (u32) dst ^= (u32) imm */
|
||||
case BPF_ALU64 | BPF_XOR | BPF_K: /* dst ^= imm */
|
||||
if (imm < 0 && BPF_CLASS(code) == BPF_ALU64) {
|
||||
/* Sign-extended */
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_XOR(dst_reg, dst_reg, b2p[TMP_REG_1]);
|
||||
} else {
|
||||
if (IMM_L(imm))
|
||||
PPC_XORI(dst_reg, dst_reg, IMM_L(imm));
|
||||
if (IMM_H(imm))
|
||||
PPC_XORIS(dst_reg, dst_reg, IMM_H(imm));
|
||||
}
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_LSH | BPF_X: /* (u32) dst <<= (u32) src */
|
||||
/* slw clears top 32 bits */
|
||||
PPC_SLW(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_LSH | BPF_X: /* dst <<= src; */
|
||||
PPC_SLD(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU | BPF_LSH | BPF_K: /* (u32) dst <<== (u32) imm */
|
||||
/* with imm 0, we still need to clear top 32 bits */
|
||||
PPC_SLWI(dst_reg, dst_reg, imm);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_LSH | BPF_K: /* dst <<== imm */
|
||||
if (imm != 0)
|
||||
PPC_SLDI(dst_reg, dst_reg, imm);
|
||||
break;
|
||||
case BPF_ALU | BPF_RSH | BPF_X: /* (u32) dst >>= (u32) src */
|
||||
PPC_SRW(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_RSH | BPF_X: /* dst >>= src */
|
||||
PPC_SRD(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU | BPF_RSH | BPF_K: /* (u32) dst >>= (u32) imm */
|
||||
PPC_SRWI(dst_reg, dst_reg, imm);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_RSH | BPF_K: /* dst >>= imm */
|
||||
if (imm != 0)
|
||||
PPC_SRDI(dst_reg, dst_reg, imm);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_ARSH | BPF_X: /* (s64) dst >>= src */
|
||||
PPC_SRAD(dst_reg, dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_ALU64 | BPF_ARSH | BPF_K: /* (s64) dst >>= imm */
|
||||
if (imm != 0)
|
||||
PPC_SRADI(dst_reg, dst_reg, imm);
|
||||
break;
|
||||
|
||||
/*
|
||||
* MOV
|
||||
*/
|
||||
case BPF_ALU | BPF_MOV | BPF_X: /* (u32) dst = src */
|
||||
case BPF_ALU64 | BPF_MOV | BPF_X: /* dst = src */
|
||||
PPC_MR(dst_reg, src_reg);
|
||||
goto bpf_alu32_trunc;
|
||||
case BPF_ALU | BPF_MOV | BPF_K: /* (u32) dst = imm */
|
||||
case BPF_ALU64 | BPF_MOV | BPF_K: /* dst = (s64) imm */
|
||||
PPC_LI32(dst_reg, imm);
|
||||
if (imm < 0)
|
||||
goto bpf_alu32_trunc;
|
||||
break;
|
||||
|
||||
bpf_alu32_trunc:
|
||||
/* Truncate to 32-bits */
|
||||
if (BPF_CLASS(code) == BPF_ALU)
|
||||
PPC_RLWINM(dst_reg, dst_reg, 0, 0, 31);
|
||||
break;
|
||||
|
||||
/*
|
||||
* BPF_FROM_BE/LE
|
||||
*/
|
||||
case BPF_ALU | BPF_END | BPF_FROM_LE:
|
||||
case BPF_ALU | BPF_END | BPF_FROM_BE:
|
||||
#ifdef __BIG_ENDIAN__
|
||||
if (BPF_SRC(code) == BPF_FROM_BE)
|
||||
goto emit_clear;
|
||||
#else /* !__BIG_ENDIAN__ */
|
||||
if (BPF_SRC(code) == BPF_FROM_LE)
|
||||
goto emit_clear;
|
||||
#endif
|
||||
switch (imm) {
|
||||
case 16:
|
||||
/* Rotate 8 bits left & mask with 0x0000ff00 */
|
||||
PPC_RLWINM(b2p[TMP_REG_1], dst_reg, 8, 16, 23);
|
||||
/* Rotate 8 bits right & insert LSB to reg */
|
||||
PPC_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 24, 31);
|
||||
/* Move result back to dst_reg */
|
||||
PPC_MR(dst_reg, b2p[TMP_REG_1]);
|
||||
break;
|
||||
case 32:
|
||||
/*
|
||||
* Rotate word left by 8 bits:
|
||||
* 2 bytes are already in their final position
|
||||
* -- byte 2 and 4 (of bytes 1, 2, 3 and 4)
|
||||
*/
|
||||
PPC_RLWINM(b2p[TMP_REG_1], dst_reg, 8, 0, 31);
|
||||
/* Rotate 24 bits and insert byte 1 */
|
||||
PPC_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 0, 7);
|
||||
/* Rotate 24 bits and insert byte 3 */
|
||||
PPC_RLWIMI(b2p[TMP_REG_1], dst_reg, 24, 16, 23);
|
||||
PPC_MR(dst_reg, b2p[TMP_REG_1]);
|
||||
break;
|
||||
case 64:
|
||||
/*
|
||||
* Way easier and faster(?) to store the value
|
||||
* into stack and then use ldbrx
|
||||
*
|
||||
* First, determine where in stack we can store
|
||||
* this:
|
||||
* - if we have allotted a stack frame, then we
|
||||
* will utilize the area set aside by
|
||||
* BPF_PPC_STACK_LOCALS
|
||||
* - else, we use the area beneath the NV GPR
|
||||
* save area
|
||||
*
|
||||
* ctx->seen will be reliable in pass2, but
|
||||
* the instructions generated will remain the
|
||||
* same across all passes
|
||||
*/
|
||||
if (bpf_has_stack_frame(ctx))
|
||||
stack_local_off = STACK_FRAME_MIN_SIZE;
|
||||
else
|
||||
stack_local_off = -(BPF_PPC_STACK_SAVE + 8);
|
||||
|
||||
PPC_STD(dst_reg, 1, stack_local_off);
|
||||
PPC_ADDI(b2p[TMP_REG_1], 1, stack_local_off);
|
||||
PPC_LDBRX(dst_reg, 0, b2p[TMP_REG_1]);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
emit_clear:
|
||||
switch (imm) {
|
||||
case 16:
|
||||
/* zero-extend 16 bits into 64 bits */
|
||||
PPC_RLDICL(dst_reg, dst_reg, 0, 48);
|
||||
break;
|
||||
case 32:
|
||||
/* zero-extend 32 bits into 64 bits */
|
||||
PPC_RLDICL(dst_reg, dst_reg, 0, 32);
|
||||
break;
|
||||
case 64:
|
||||
/* nop */
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
/*
|
||||
* BPF_ST(X)
|
||||
*/
|
||||
case BPF_STX | BPF_MEM | BPF_B: /* *(u8 *)(dst + off) = src */
|
||||
case BPF_ST | BPF_MEM | BPF_B: /* *(u8 *)(dst + off) = imm */
|
||||
if (BPF_CLASS(code) == BPF_ST) {
|
||||
PPC_LI(b2p[TMP_REG_1], imm);
|
||||
src_reg = b2p[TMP_REG_1];
|
||||
}
|
||||
PPC_STB(src_reg, dst_reg, off);
|
||||
break;
|
||||
case BPF_STX | BPF_MEM | BPF_H: /* (u16 *)(dst + off) = src */
|
||||
case BPF_ST | BPF_MEM | BPF_H: /* (u16 *)(dst + off) = imm */
|
||||
if (BPF_CLASS(code) == BPF_ST) {
|
||||
PPC_LI(b2p[TMP_REG_1], imm);
|
||||
src_reg = b2p[TMP_REG_1];
|
||||
}
|
||||
PPC_STH(src_reg, dst_reg, off);
|
||||
break;
|
||||
case BPF_STX | BPF_MEM | BPF_W: /* *(u32 *)(dst + off) = src */
|
||||
case BPF_ST | BPF_MEM | BPF_W: /* *(u32 *)(dst + off) = imm */
|
||||
if (BPF_CLASS(code) == BPF_ST) {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
src_reg = b2p[TMP_REG_1];
|
||||
}
|
||||
PPC_STW(src_reg, dst_reg, off);
|
||||
break;
|
||||
case BPF_STX | BPF_MEM | BPF_DW: /* (u64 *)(dst + off) = src */
|
||||
case BPF_ST | BPF_MEM | BPF_DW: /* *(u64 *)(dst + off) = imm */
|
||||
if (BPF_CLASS(code) == BPF_ST) {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
src_reg = b2p[TMP_REG_1];
|
||||
}
|
||||
PPC_STD(src_reg, dst_reg, off);
|
||||
break;
|
||||
|
||||
/*
|
||||
* BPF_STX XADD (atomic_add)
|
||||
*/
|
||||
/* *(u32 *)(dst + off) += src */
|
||||
case BPF_STX | BPF_XADD | BPF_W:
|
||||
/* Get EA into TMP_REG_1 */
|
||||
PPC_ADDI(b2p[TMP_REG_1], dst_reg, off);
|
||||
/* error if EA is not word-aligned */
|
||||
PPC_ANDI(b2p[TMP_REG_2], b2p[TMP_REG_1], 0x03);
|
||||
PPC_BCC_SHORT(COND_EQ, (ctx->idx * 4) + 12);
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_JMP(exit_addr);
|
||||
/* load value from memory into TMP_REG_2 */
|
||||
PPC_BPF_LWARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0);
|
||||
/* add value from src_reg into this */
|
||||
PPC_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg);
|
||||
/* store result back */
|
||||
PPC_BPF_STWCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]);
|
||||
/* we're done if this succeeded */
|
||||
PPC_BCC_SHORT(COND_EQ, (ctx->idx * 4) + (7*4));
|
||||
/* otherwise, let's try once more */
|
||||
PPC_BPF_LWARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0);
|
||||
PPC_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg);
|
||||
PPC_BPF_STWCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]);
|
||||
/* exit if the store was not successful */
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_BCC(COND_NE, exit_addr);
|
||||
break;
|
||||
/* *(u64 *)(dst + off) += src */
|
||||
case BPF_STX | BPF_XADD | BPF_DW:
|
||||
PPC_ADDI(b2p[TMP_REG_1], dst_reg, off);
|
||||
/* error if EA is not doubleword-aligned */
|
||||
PPC_ANDI(b2p[TMP_REG_2], b2p[TMP_REG_1], 0x07);
|
||||
PPC_BCC_SHORT(COND_EQ, (ctx->idx * 4) + (3*4));
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_JMP(exit_addr);
|
||||
PPC_BPF_LDARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0);
|
||||
PPC_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg);
|
||||
PPC_BPF_STDCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]);
|
||||
PPC_BCC_SHORT(COND_EQ, (ctx->idx * 4) + (7*4));
|
||||
PPC_BPF_LDARX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1], 0);
|
||||
PPC_ADD(b2p[TMP_REG_2], b2p[TMP_REG_2], src_reg);
|
||||
PPC_BPF_STDCX(b2p[TMP_REG_2], 0, b2p[TMP_REG_1]);
|
||||
PPC_LI(b2p[BPF_REG_0], 0);
|
||||
PPC_BCC(COND_NE, exit_addr);
|
||||
break;
|
||||
|
||||
/*
|
||||
* BPF_LDX
|
||||
*/
|
||||
/* dst = *(u8 *)(ul) (src + off) */
|
||||
case BPF_LDX | BPF_MEM | BPF_B:
|
||||
PPC_LBZ(dst_reg, src_reg, off);
|
||||
break;
|
||||
/* dst = *(u16 *)(ul) (src + off) */
|
||||
case BPF_LDX | BPF_MEM | BPF_H:
|
||||
PPC_LHZ(dst_reg, src_reg, off);
|
||||
break;
|
||||
/* dst = *(u32 *)(ul) (src + off) */
|
||||
case BPF_LDX | BPF_MEM | BPF_W:
|
||||
PPC_LWZ(dst_reg, src_reg, off);
|
||||
break;
|
||||
/* dst = *(u64 *)(ul) (src + off) */
|
||||
case BPF_LDX | BPF_MEM | BPF_DW:
|
||||
PPC_LD(dst_reg, src_reg, off);
|
||||
break;
|
||||
|
||||
/*
|
||||
* Doubleword load
|
||||
* 16 byte instruction that uses two 'struct bpf_insn'
|
||||
*/
|
||||
case BPF_LD | BPF_IMM | BPF_DW: /* dst = (u64) imm */
|
||||
imm64 = ((u64)(u32) insn[i].imm) |
|
||||
(((u64)(u32) insn[i+1].imm) << 32);
|
||||
/* Adjust for two bpf instructions */
|
||||
addrs[++i] = ctx->idx * 4;
|
||||
PPC_LI64(dst_reg, imm64);
|
||||
break;
|
||||
|
||||
/*
|
||||
* Return/Exit
|
||||
*/
|
||||
case BPF_JMP | BPF_EXIT:
|
||||
/*
|
||||
* If this isn't the very last instruction, branch to
|
||||
* the epilogue. If we _are_ the last instruction,
|
||||
* we'll just fall through to the epilogue.
|
||||
*/
|
||||
if (i != flen - 1)
|
||||
PPC_JMP(exit_addr);
|
||||
/* else fall through to the epilogue */
|
||||
break;
|
||||
|
||||
/*
|
||||
* Call kernel helper
|
||||
*/
|
||||
case BPF_JMP | BPF_CALL:
|
||||
ctx->seen |= SEEN_FUNC;
|
||||
func = (u8 *) __bpf_call_base + imm;
|
||||
|
||||
/* Save skb pointer if we need to re-cache skb data */
|
||||
if (bpf_helper_changes_skb_data(func))
|
||||
PPC_BPF_STL(3, 1, STACK_FRAME_MIN_SIZE);
|
||||
|
||||
bpf_jit_emit_func_call(image, ctx, (u64)func);
|
||||
|
||||
/* move return value from r3 to BPF_REG_0 */
|
||||
PPC_MR(b2p[BPF_REG_0], 3);
|
||||
|
||||
/* refresh skb cache */
|
||||
if (bpf_helper_changes_skb_data(func)) {
|
||||
/* reload skb pointer to r3 */
|
||||
PPC_BPF_LL(3, 1, STACK_FRAME_MIN_SIZE);
|
||||
bpf_jit_emit_skb_loads(image, ctx);
|
||||
}
|
||||
break;
|
||||
|
||||
/*
|
||||
* Jumps and branches
|
||||
*/
|
||||
case BPF_JMP | BPF_JA:
|
||||
PPC_JMP(addrs[i + 1 + off]);
|
||||
break;
|
||||
|
||||
case BPF_JMP | BPF_JGT | BPF_K:
|
||||
case BPF_JMP | BPF_JGT | BPF_X:
|
||||
case BPF_JMP | BPF_JSGT | BPF_K:
|
||||
case BPF_JMP | BPF_JSGT | BPF_X:
|
||||
true_cond = COND_GT;
|
||||
goto cond_branch;
|
||||
case BPF_JMP | BPF_JGE | BPF_K:
|
||||
case BPF_JMP | BPF_JGE | BPF_X:
|
||||
case BPF_JMP | BPF_JSGE | BPF_K:
|
||||
case BPF_JMP | BPF_JSGE | BPF_X:
|
||||
true_cond = COND_GE;
|
||||
goto cond_branch;
|
||||
case BPF_JMP | BPF_JEQ | BPF_K:
|
||||
case BPF_JMP | BPF_JEQ | BPF_X:
|
||||
true_cond = COND_EQ;
|
||||
goto cond_branch;
|
||||
case BPF_JMP | BPF_JNE | BPF_K:
|
||||
case BPF_JMP | BPF_JNE | BPF_X:
|
||||
true_cond = COND_NE;
|
||||
goto cond_branch;
|
||||
case BPF_JMP | BPF_JSET | BPF_K:
|
||||
case BPF_JMP | BPF_JSET | BPF_X:
|
||||
true_cond = COND_NE;
|
||||
/* Fall through */
|
||||
|
||||
cond_branch:
|
||||
switch (code) {
|
||||
case BPF_JMP | BPF_JGT | BPF_X:
|
||||
case BPF_JMP | BPF_JGE | BPF_X:
|
||||
case BPF_JMP | BPF_JEQ | BPF_X:
|
||||
case BPF_JMP | BPF_JNE | BPF_X:
|
||||
/* unsigned comparison */
|
||||
PPC_CMPLD(dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_JMP | BPF_JSGT | BPF_X:
|
||||
case BPF_JMP | BPF_JSGE | BPF_X:
|
||||
/* signed comparison */
|
||||
PPC_CMPD(dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_JMP | BPF_JSET | BPF_X:
|
||||
PPC_AND_DOT(b2p[TMP_REG_1], dst_reg, src_reg);
|
||||
break;
|
||||
case BPF_JMP | BPF_JNE | BPF_K:
|
||||
case BPF_JMP | BPF_JEQ | BPF_K:
|
||||
case BPF_JMP | BPF_JGT | BPF_K:
|
||||
case BPF_JMP | BPF_JGE | BPF_K:
|
||||
/*
|
||||
* Need sign-extended load, so only positive
|
||||
* values can be used as imm in cmpldi
|
||||
*/
|
||||
if (imm >= 0 && imm < 32768)
|
||||
PPC_CMPLDI(dst_reg, imm);
|
||||
else {
|
||||
/* sign-extending load */
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
/* ... but unsigned comparison */
|
||||
PPC_CMPLD(dst_reg, b2p[TMP_REG_1]);
|
||||
}
|
||||
break;
|
||||
case BPF_JMP | BPF_JSGT | BPF_K:
|
||||
case BPF_JMP | BPF_JSGE | BPF_K:
|
||||
/*
|
||||
* signed comparison, so any 16-bit value
|
||||
* can be used in cmpdi
|
||||
*/
|
||||
if (imm >= -32768 && imm < 32768)
|
||||
PPC_CMPDI(dst_reg, imm);
|
||||
else {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_CMPD(dst_reg, b2p[TMP_REG_1]);
|
||||
}
|
||||
break;
|
||||
case BPF_JMP | BPF_JSET | BPF_K:
|
||||
/* andi does not sign-extend the immediate */
|
||||
if (imm >= 0 && imm < 32768)
|
||||
/* PPC_ANDI is _only/always_ dot-form */
|
||||
PPC_ANDI(b2p[TMP_REG_1], dst_reg, imm);
|
||||
else {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_AND_DOT(b2p[TMP_REG_1], dst_reg,
|
||||
b2p[TMP_REG_1]);
|
||||
}
|
||||
break;
|
||||
}
|
||||
PPC_BCC(true_cond, addrs[i + 1 + off]);
|
||||
break;
|
||||
|
||||
/*
|
||||
* Loads from packet header/data
|
||||
* Assume 32-bit input value in imm and X (src_reg)
|
||||
*/
|
||||
|
||||
/* Absolute loads */
|
||||
case BPF_LD | BPF_W | BPF_ABS:
|
||||
func = (u8 *)CHOOSE_LOAD_FUNC(imm, sk_load_word);
|
||||
goto common_load_abs;
|
||||
case BPF_LD | BPF_H | BPF_ABS:
|
||||
func = (u8 *)CHOOSE_LOAD_FUNC(imm, sk_load_half);
|
||||
goto common_load_abs;
|
||||
case BPF_LD | BPF_B | BPF_ABS:
|
||||
func = (u8 *)CHOOSE_LOAD_FUNC(imm, sk_load_byte);
|
||||
common_load_abs:
|
||||
/*
|
||||
* Load from [imm]
|
||||
* Load into r4, which can just be passed onto
|
||||
* skb load helpers as the second parameter
|
||||
*/
|
||||
PPC_LI32(4, imm);
|
||||
goto common_load;
|
||||
|
||||
/* Indirect loads */
|
||||
case BPF_LD | BPF_W | BPF_IND:
|
||||
func = (u8 *)sk_load_word;
|
||||
goto common_load_ind;
|
||||
case BPF_LD | BPF_H | BPF_IND:
|
||||
func = (u8 *)sk_load_half;
|
||||
goto common_load_ind;
|
||||
case BPF_LD | BPF_B | BPF_IND:
|
||||
func = (u8 *)sk_load_byte;
|
||||
common_load_ind:
|
||||
/*
|
||||
* Load from [src_reg + imm]
|
||||
* Treat src_reg as a 32-bit value
|
||||
*/
|
||||
PPC_EXTSW(4, src_reg);
|
||||
if (imm) {
|
||||
if (imm >= -32768 && imm < 32768)
|
||||
PPC_ADDI(4, 4, IMM_L(imm));
|
||||
else {
|
||||
PPC_LI32(b2p[TMP_REG_1], imm);
|
||||
PPC_ADD(4, 4, b2p[TMP_REG_1]);
|
||||
}
|
||||
}
|
||||
|
||||
common_load:
|
||||
ctx->seen |= SEEN_SKB;
|
||||
ctx->seen |= SEEN_FUNC;
|
||||
bpf_jit_emit_func_call(image, ctx, (u64)func);
|
||||
|
||||
/*
|
||||
* Helper returns 'lt' condition on error, and an
|
||||
* appropriate return value in BPF_REG_0
|
||||
*/
|
||||
PPC_BCC(COND_LT, exit_addr);
|
||||
break;
|
||||
|
||||
/*
|
||||
* TODO: Tail call
|
||||
*/
|
||||
case BPF_JMP | BPF_CALL | BPF_X:
|
||||
|
||||
default:
|
||||
/*
|
||||
* The filter contains something cruel & unusual.
|
||||
* We don't handle it, but also there shouldn't be
|
||||
* anything missing from our list.
|
||||
*/
|
||||
pr_err_ratelimited("eBPF filter opcode %04x (@%d) unsupported\n",
|
||||
code, i);
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
}
|
||||
|
||||
/* Set end-of-body-code address for exit. */
|
||||
addrs[i] = ctx->idx * 4;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void bpf_jit_compile(struct bpf_prog *fp) { }
|
||||
|
||||
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
|
||||
{
|
||||
u32 proglen;
|
||||
u32 alloclen;
|
||||
u8 *image = NULL;
|
||||
u32 *code_base;
|
||||
u32 *addrs;
|
||||
struct codegen_context cgctx;
|
||||
int pass;
|
||||
int flen;
|
||||
struct bpf_binary_header *bpf_hdr;
|
||||
|
||||
if (!bpf_jit_enable)
|
||||
return fp;
|
||||
|
||||
flen = fp->len;
|
||||
addrs = kzalloc((flen+1) * sizeof(*addrs), GFP_KERNEL);
|
||||
if (addrs == NULL)
|
||||
return fp;
|
||||
|
||||
cgctx.idx = 0;
|
||||
cgctx.seen = 0;
|
||||
/* Scouting faux-generate pass 0 */
|
||||
if (bpf_jit_build_body(fp, 0, &cgctx, addrs))
|
||||
/* We hit something illegal or unsupported. */
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* Pretend to build prologue, given the features we've seen. This will
|
||||
* update ctgtx.idx as it pretends to output instructions, then we can
|
||||
* calculate total size from idx.
|
||||
*/
|
||||
bpf_jit_build_prologue(0, &cgctx);
|
||||
bpf_jit_build_epilogue(0, &cgctx);
|
||||
|
||||
proglen = cgctx.idx * 4;
|
||||
alloclen = proglen + FUNCTION_DESCR_SIZE;
|
||||
|
||||
bpf_hdr = bpf_jit_binary_alloc(alloclen, &image, 4,
|
||||
bpf_jit_fill_ill_insns);
|
||||
if (!bpf_hdr)
|
||||
goto out;
|
||||
|
||||
code_base = (u32 *)(image + FUNCTION_DESCR_SIZE);
|
||||
|
||||
/* Code generation passes 1-2 */
|
||||
for (pass = 1; pass < 3; pass++) {
|
||||
/* Now build the prologue, body code & epilogue for real. */
|
||||
cgctx.idx = 0;
|
||||
bpf_jit_build_prologue(code_base, &cgctx);
|
||||
bpf_jit_build_body(fp, code_base, &cgctx, addrs);
|
||||
bpf_jit_build_epilogue(code_base, &cgctx);
|
||||
|
||||
if (bpf_jit_enable > 1)
|
||||
pr_info("Pass %d: shrink = %d, seen = 0x%x\n", pass,
|
||||
proglen - (cgctx.idx * 4), cgctx.seen);
|
||||
}
|
||||
|
||||
if (bpf_jit_enable > 1)
|
||||
/*
|
||||
* Note that we output the base address of the code_base
|
||||
* rather than image, since opcodes are in code_base.
|
||||
*/
|
||||
bpf_jit_dump(flen, proglen, pass, code_base);
|
||||
|
||||
if (image) {
|
||||
bpf_flush_icache(bpf_hdr, image + alloclen);
|
||||
#ifdef PPC64_ELF_ABI_v1
|
||||
/* Function descriptor nastiness: Address + TOC */
|
||||
((u64 *)image)[0] = (u64)code_base;
|
||||
((u64 *)image)[1] = local_paca->kernel_toc;
|
||||
#endif
|
||||
fp->bpf_func = (void *)image;
|
||||
fp->jited = 1;
|
||||
}
|
||||
|
||||
out:
|
||||
kfree(addrs);
|
||||
return fp;
|
||||
}
|
||||
|
||||
void bpf_jit_free(struct bpf_prog *fp)
|
||||
{
|
||||
unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
|
||||
struct bpf_binary_header *bpf_hdr = (void *)addr;
|
||||
|
||||
if (fp->jited)
|
||||
bpf_jit_binary_free(bpf_hdr);
|
||||
|
||||
bpf_prog_unlock_free(fp);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user