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8676
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1 #!/bin/bash
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2
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3 export LANG=C
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4
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5 set -e
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6
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7 if [ $# -lt 1 ]; then
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8 echo "Usage: PROGNAME=foo LICENSE=bar $0 <bpf object file>"
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9 exit 1
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10 fi
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11
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12
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13 self=$0
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14 filename=$1
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15 funcname=$PROGNAME
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16
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17 generate_head()
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18 {
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19 cat << END
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20 /* AUTO-GENERATED, DO NOT EDIT. */
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21
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22 #include <stddef.h>
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23 #include <stdint.h>
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24
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25 #include "ngx_bpf.h"
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26
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27
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28 END
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29 }
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30
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31 generate_tail()
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32 {
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33 cat << END
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34
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35 ngx_bpf_program_t $PROGNAME = {
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36 .relocs = bpf_reloc_prog_$funcname,
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37 .nrelocs = sizeof(bpf_reloc_prog_$funcname)
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38 / sizeof(bpf_reloc_prog_$funcname[0]),
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39 .ins = bpf_insn_prog_$funcname,
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40 .nins = sizeof(bpf_insn_prog_$funcname)
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41 / sizeof(bpf_insn_prog_$funcname[0]),
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42 .license = "$LICENSE",
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43 .type = BPF_PROG_TYPE_SK_REUSEPORT,
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44 };
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45
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46 END
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47 }
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48
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49 process_relocations()
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50 {
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51 echo "static ngx_bpf_reloc_t bpf_reloc_prog_$funcname[] = {"
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52
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53 objdump -r $filename | awk '{
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54
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55 if (enabled && $NF > 0) {
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56 off = strtonum(sprintf("0x%s", $1));
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57 name = $3;
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58
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59 printf(" { \"%s\", %d },\n", name, off/8);
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60 }
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61
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62 if ($1 == "OFFSET") {
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63 enabled=1;
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64 }
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65 }'
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66 echo "};"
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67 echo
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68 }
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69
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70 process_section()
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71 {
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72 echo "static struct bpf_insn bpf_insn_prog_$funcname[] = {"
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73 echo " /* opcode dst src offset imm */"
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74
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75 section_info=$(objdump -h $filename --section=$funcname | grep "1 $funcname")
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76
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77 # dd doesn't know hex
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78 length=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f3))
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79 offset=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f6))
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80
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81 for ins in $(dd if="$filename" bs=1 count=$length skip=$offset status=none | xxd -p -c 8)
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82 do
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83 opcode=0x${ins:0:2}
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84 srcdst=0x${ins:2:2}
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85
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86 # bytes are dumped in LE order
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87 offset=0x${ins:6:2}${ins:4:2} # short
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88 immedi=0x${ins:14:2}${ins:12:2}${ins:10:2}${ins:8:2} # int
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89
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90 dst="$(($srcdst & 0xF))"
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91 src="$(($srcdst & 0xF0))"
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92 src="$(($src >> 4))"
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93
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94 opcode=$(printf "0x%x" $opcode)
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95 dst=$(printf "BPF_REG_%d" $dst)
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96 src=$(printf "BPF_REG_%d" $src)
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97 offset=$(printf "%d" $offset)
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98 immedi=$(printf "0x%x" $immedi)
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99
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100 printf " { %4s, %11s, %11s, (int16_t) %6s, %10s },\n" $opcode $dst $src $offset $immedi
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101 done
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102
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103 cat << END
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104 };
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105
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106 END
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107 }
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108
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109 generate_head
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110 process_relocations
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111 process_section
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112 generate_tail
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113
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