Mercurial > hg > nginx
view src/event/quic/bpf/bpfgen.sh @ 8924:d6ef13c5fd8e quic
QUIC: simplified configuration.
Directives that set transport parameters are removed from the configuration.
Corresponding values are derived from the quic configuration or initialized
to default. Whenever possible, quic configuration parameters are taken from
higher-level protocol settings, i.e. HTTP/3.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Mon, 06 Dec 2021 15:19:54 +0300 |
parents | 7df607cb2d11 |
children |
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#!/bin/bash export LANG=C set -e if [ $# -lt 1 ]; then echo "Usage: PROGNAME=foo LICENSE=bar $0 <bpf object file>" exit 1 fi self=$0 filename=$1 funcname=$PROGNAME generate_head() { cat << END /* AUTO-GENERATED, DO NOT EDIT. */ #include <stddef.h> #include <stdint.h> #include "ngx_bpf.h" END } generate_tail() { cat << END ngx_bpf_program_t $PROGNAME = { .relocs = bpf_reloc_prog_$funcname, .nrelocs = sizeof(bpf_reloc_prog_$funcname) / sizeof(bpf_reloc_prog_$funcname[0]), .ins = bpf_insn_prog_$funcname, .nins = sizeof(bpf_insn_prog_$funcname) / sizeof(bpf_insn_prog_$funcname[0]), .license = "$LICENSE", .type = BPF_PROG_TYPE_SK_REUSEPORT, }; END } process_relocations() { echo "static ngx_bpf_reloc_t bpf_reloc_prog_$funcname[] = {" objdump -r $filename | awk '{ if (enabled && $NF > 0) { off = strtonum(sprintf("0x%s", $1)); name = $3; printf(" { \"%s\", %d },\n", name, off/8); } if ($1 == "OFFSET") { enabled=1; } }' echo "};" echo } process_section() { echo "static struct bpf_insn bpf_insn_prog_$funcname[] = {" echo " /* opcode dst src offset imm */" section_info=$(objdump -h $filename --section=$funcname | grep "1 $funcname") # dd doesn't know hex length=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f3)) offset=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f6)) for ins in $(dd if="$filename" bs=1 count=$length skip=$offset status=none | xxd -p -c 8) do opcode=0x${ins:0:2} srcdst=0x${ins:2:2} # bytes are dumped in LE order offset=0x${ins:6:2}${ins:4:2} # short immedi=0x${ins:14:2}${ins:12:2}${ins:10:2}${ins:8:2} # int dst="$(($srcdst & 0xF))" src="$(($srcdst & 0xF0))" src="$(($src >> 4))" opcode=$(printf "0x%x" $opcode) dst=$(printf "BPF_REG_%d" $dst) src=$(printf "BPF_REG_%d" $src) offset=$(printf "%d" $offset) immedi=$(printf "0x%x" $immedi) printf " { %4s, %11s, %11s, (int16_t) %6s, %10s },\n" $opcode $dst $src $offset $immedi done cat << END }; END } generate_head process_relocations process_section generate_tail