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139 lines
3.9 KiB
139 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* bpf_jit32.h: BPF JIT compiler for PPC |
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* |
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* Copyright 2011 Matt Evans <[email protected]>, IBM Corporation |
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* |
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* Split from bpf_jit.h |
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*/ |
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#ifndef _BPF_JIT32_H |
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#define _BPF_JIT32_H |
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#include <asm/asm-compat.h> |
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#include "bpf_jit.h" |
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#ifdef CONFIG_PPC64 |
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#define BPF_PPC_STACK_R3_OFF 48 |
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#define BPF_PPC_STACK_LOCALS 32 |
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#define BPF_PPC_STACK_BASIC (48+64) |
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#define BPF_PPC_STACK_SAVE (18*8) |
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#define BPF_PPC_STACKFRAME (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \ |
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BPF_PPC_STACK_SAVE) |
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#define BPF_PPC_SLOWPATH_FRAME (48+64) |
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#else |
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#define BPF_PPC_STACK_R3_OFF 24 |
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#define BPF_PPC_STACK_LOCALS 16 |
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#define BPF_PPC_STACK_BASIC (24+32) |
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#define BPF_PPC_STACK_SAVE (18*4) |
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#define BPF_PPC_STACKFRAME (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \ |
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BPF_PPC_STACK_SAVE) |
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#define BPF_PPC_SLOWPATH_FRAME (24+32) |
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#endif |
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#define REG_SZ (BITS_PER_LONG/8) |
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/* |
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* Generated code register usage: |
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* |
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* As normal PPC C ABI (e.g. r1=sp, r2=TOC), with: |
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* |
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* skb r3 (Entry parameter) |
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* A register r4 |
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* X register r5 |
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* addr param r6 |
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* r7-r10 scratch |
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* skb->data r14 |
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* skb headlen r15 (skb->len - skb->data_len) |
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* m[0] r16 |
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* m[...] ... |
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* m[15] r31 |
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*/ |
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#define r_skb 3 |
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#define r_ret 3 |
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#define r_A 4 |
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#define r_X 5 |
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#define r_addr 6 |
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#define r_scratch1 7 |
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#define r_scratch2 8 |
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#define r_D 14 |
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#define r_HL 15 |
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#define r_M 16 |
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#ifndef __ASSEMBLY__ |
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/* |
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* Assembly helpers from arch/powerpc/net/bpf_jit.S: |
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*/ |
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#define DECLARE_LOAD_FUNC(func) \ |
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extern u8 func[], func##_negative_offset[], func##_positive_offset[] |
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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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DECLARE_LOAD_FUNC(sk_load_byte_msh); |
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#define PPC_LBZ_OFFS(r, base, i) do { if ((i) < 32768) EMIT(PPC_RAW_LBZ(r, base, i)); \ |
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else { EMIT(PPC_RAW_ADDIS(r, base, IMM_HA(i))); \ |
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EMIT(PPC_RAW_LBZ(r, r, IMM_L(i))); } } while(0) |
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#define PPC_LD_OFFS(r, base, i) do { if ((i) < 32768) EMIT(PPC_RAW_LD(r, base, i)); \ |
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else { EMIT(PPC_RAW_ADDIS(r, base, IMM_HA(i))); \ |
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EMIT(PPC_RAW_LD(r, r, IMM_L(i))); } } while(0) |
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#define PPC_LWZ_OFFS(r, base, i) do { if ((i) < 32768) EMIT(PPC_RAW_LWZ(r, base, i)); \ |
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else { EMIT(PPC_RAW_ADDIS(r, base, IMM_HA(i))); \ |
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EMIT(PPC_RAW_LWZ(r, r, IMM_L(i))); } } while(0) |
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#define PPC_LHZ_OFFS(r, base, i) do { if ((i) < 32768) EMIT(PPC_RAW_LHZ(r, base, i)); \ |
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else { EMIT(PPC_RAW_ADDIS(r, base, IMM_HA(i))); \ |
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EMIT(PPC_RAW_LHZ(r, r, IMM_L(i))); } } while(0) |
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#ifdef CONFIG_PPC64 |
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#define PPC_LL_OFFS(r, base, i) do { PPC_LD_OFFS(r, base, i); } while(0) |
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#else |
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#define PPC_LL_OFFS(r, base, i) do { PPC_LWZ_OFFS(r, base, i); } while(0) |
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#endif |
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#ifdef CONFIG_SMP |
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#ifdef CONFIG_PPC64 |
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#define PPC_BPF_LOAD_CPU(r) \ |
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do { BUILD_BUG_ON(sizeof_field(struct paca_struct, paca_index) != 2); \ |
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PPC_LHZ_OFFS(r, 13, offsetof(struct paca_struct, paca_index)); \ |
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} while (0) |
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#else |
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#define PPC_BPF_LOAD_CPU(r) \ |
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do { BUILD_BUG_ON(sizeof_field(struct task_struct, cpu) != 4); \ |
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PPC_LHZ_OFFS(r, 2, offsetof(struct task_struct, cpu)); \ |
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} while(0) |
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#endif |
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#else |
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#define PPC_BPF_LOAD_CPU(r) do { EMIT(PPC_RAW_LI(r, 0)); } while(0) |
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#endif |
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#define PPC_LHBRX_OFFS(r, base, i) \ |
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do { PPC_LI32(r, i); EMIT(PPC_RAW_LHBRX(r, r, base)); } while(0) |
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#ifdef __LITTLE_ENDIAN__ |
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#define PPC_NTOHS_OFFS(r, base, i) PPC_LHBRX_OFFS(r, base, i) |
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#else |
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#define PPC_NTOHS_OFFS(r, base, i) PPC_LHZ_OFFS(r, base, i) |
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#endif |
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#define PPC_BPF_LL(r, base, i) do { EMIT(PPC_RAW_LWZ(r, base, i)); } while(0) |
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#define PPC_BPF_STL(r, base, i) do { EMIT(PPC_RAW_STW(r, base, i)); } while(0) |
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#define PPC_BPF_STLU(r, base, i) do { EMIT(PPC_RAW_STWU(r, base, i)); } while(0) |
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#define SEEN_DATAREF 0x10000 /* might call external helpers */ |
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#define SEEN_XREG 0x20000 /* X reg is used */ |
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#define SEEN_MEM 0x40000 /* SEEN_MEM+(1<<n) = use mem[n] for temporary |
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* storage */ |
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#define SEEN_MEM_MSK 0x0ffff |
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struct codegen_context { |
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unsigned int seen; |
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unsigned int idx; |
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int pc_ret0; /* bpf index of first RET #0 instruction (if any) */ |
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}; |
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#endif |
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#endif
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