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Linux/arch/powerpc/net/bpf_jit64.h

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  1 /*
  2  * bpf_jit64.h: BPF JIT compiler for PPC64
  3  *
  4  * Copyright 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
  5  *                IBM Corporation
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; version 2
 10  * of the License.
 11  */
 12 #ifndef _BPF_JIT64_H
 13 #define _BPF_JIT64_H
 14 
 15 #include "bpf_jit.h"
 16 
 17 /*
 18  * Stack layout:
 19  * Ensure the top half (upto local_tmp_var) stays consistent
 20  * with our redzone usage.
 21  *
 22  *              [       prev sp         ] <-------------
 23  *              [   nv gpr save area    ] 8*8           |
 24  *              [    tail_call_cnt      ] 8             |
 25  *              [    local_tmp_var      ] 8             |
 26  * fp (r31) --> [   ebpf stack space    ] 512           |
 27  *              [     frame header      ] 32/112        |
 28  * sp (r1) ---> [    stack pointer      ] --------------
 29  */
 30 
 31 /* for gpr non volatile registers BPG_REG_6 to 10, plus skb cache registers */
 32 #define BPF_PPC_STACK_SAVE      (8*8)
 33 /* for bpf JIT code internal usage */
 34 #define BPF_PPC_STACK_LOCALS    16
 35 /* Ensure this is quadword aligned */
 36 #define BPF_PPC_STACKFRAME      (STACK_FRAME_MIN_SIZE + MAX_BPF_STACK + \
 37                                  BPF_PPC_STACK_LOCALS + BPF_PPC_STACK_SAVE)
 38 
 39 #ifndef __ASSEMBLY__
 40 
 41 /* BPF register usage */
 42 #define SKB_HLEN_REG    (MAX_BPF_JIT_REG + 0)
 43 #define SKB_DATA_REG    (MAX_BPF_JIT_REG + 1)
 44 #define TMP_REG_1       (MAX_BPF_JIT_REG + 2)
 45 #define TMP_REG_2       (MAX_BPF_JIT_REG + 3)
 46 
 47 /* BPF to ppc register mappings */
 48 static const int b2p[] = {
 49         /* function return value */
 50         [BPF_REG_0] = 8,
 51         /* function arguments */
 52         [BPF_REG_1] = 3,
 53         [BPF_REG_2] = 4,
 54         [BPF_REG_3] = 5,
 55         [BPF_REG_4] = 6,
 56         [BPF_REG_5] = 7,
 57         /* non volatile registers */
 58         [BPF_REG_6] = 27,
 59         [BPF_REG_7] = 28,
 60         [BPF_REG_8] = 29,
 61         [BPF_REG_9] = 30,
 62         /* frame pointer aka BPF_REG_10 */
 63         [BPF_REG_FP] = 31,
 64         /* eBPF jit internal registers */
 65         [BPF_REG_AX] = 2,
 66         [SKB_HLEN_REG] = 25,
 67         [SKB_DATA_REG] = 26,
 68         [TMP_REG_1] = 9,
 69         [TMP_REG_2] = 10
 70 };
 71 
 72 /* PPC NVR range -- update this if we ever use NVRs below r24 */
 73 #define BPF_PPC_NVR_MIN         24
 74 
 75 /* Assembly helpers */
 76 #define DECLARE_LOAD_FUNC(func) u64 func(u64 r3, u64 r4);                       \
 77                                 u64 func##_negative_offset(u64 r3, u64 r4);     \
 78                                 u64 func##_positive_offset(u64 r3, u64 r4);
 79 
 80 DECLARE_LOAD_FUNC(sk_load_word);
 81 DECLARE_LOAD_FUNC(sk_load_half);
 82 DECLARE_LOAD_FUNC(sk_load_byte);
 83 
 84 #define CHOOSE_LOAD_FUNC(imm, func)                                             \
 85                         (imm < 0 ?                                              \
 86                         (imm >= SKF_LL_OFF ? func##_negative_offset : func) :   \
 87                         func##_positive_offset)
 88 
 89 #define SEEN_FUNC       0x1000 /* might call external helpers */
 90 #define SEEN_STACK      0x2000 /* uses BPF stack */
 91 #define SEEN_SKB        0x4000 /* uses sk_buff */
 92 #define SEEN_TAILCALL   0x8000 /* uses tail calls */
 93 
 94 struct codegen_context {
 95         /*
 96          * This is used to track register usage as well
 97          * as calls to external helpers.
 98          * - register usage is tracked with corresponding
 99          *   bits (r3-r10 and r25-r31)
100          * - rest of the bits can be used to track other
101          *   things -- for now, we use bits 16 to 23
102          *   encoded in SEEN_* macros above
103          */
104         unsigned int seen;
105         unsigned int idx;
106 };
107 
108 #endif /* !__ASSEMBLY__ */
109 
110 #endif
111 

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