Quelle faddr2line Sprache: unbekannt

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Translate stack dump function offsets.
#
# addr2line doesn't work with KASLR addresses.  This works similarly to
# addr2line, but instead takes the 'func+0x123' format as input:
#
#   $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568
#   meminfo_proc_show+0x5/0x568:
#   meminfo_proc_show at fs/proc/meminfo.c:27
#
# If the address is part of an inlined function, the full inline call chain is
# printed:
#
#   $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27
#   native_write_msr+0x6/0x27:
#   arch_static_branch at arch/x86/include/asm/msr.h:121
#    (inlined by) static_key_false at include/linux/jump_label.h:125
#    (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125
#
# The function size after the '/' in the input is optional, but recommended.
# It's used to help disambiguate any duplicate symbol names, which can occur
# rarely.  If the size is omitted for a duplicate symbol then it's possible for
# multiple code sites to be printed:
#
#   $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5
#   raw_ioctl+0x5/0x20:
#   raw_ioctl at drivers/char/raw.c:122
#
#   raw_ioctl+0x5/0xb1:
#   raw_ioctl at net/ipv4/raw.c:876
#
# Multiple addresses can be specified on a single command line:
#
#   $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90
#   type_show+0x10/0x2d:
#   type_show at drivers/video/backlight/backlight.c:213
#
#   free_reserved_area+0x90/0x123:
#   free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)

set -o errexit
set -o nounset

usage() {
echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
exit 1
}

warn() {
echo "$1" >&2
}

die() {
echo "ERROR: $1" >&2
exit 1
}

UTIL_SUFFIX=""
if [[ "${LLVM:-}" == "" ]]; then
UTIL_PREFIX=${CROSS_COMPILE:-}
else
UTIL_PREFIX=llvm-

if [[ "${LLVM}" == *"/" ]]; then
  UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
elif [[ "${LLVM}" == "-"* ]]; then
  UTIL_SUFFIX=${LLVM}
fi
fi

READELF="${UTIL_PREFIX}readelf${UTIL_SUFFIX}"
ADDR2LINE="${UTIL_PREFIX}addr2line${UTIL_SUFFIX}"
AWK="awk"
GREP="grep"

command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed"
command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed"
command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed"

# Try to figure out the source directory prefix so we can remove it from the
# addr2line output.  HACK ALERT: This assumes that start_kernel() is in
# init/main.c!  This only works for vmlinux.  Otherwise it falls back to
# printing the absolute path.
find_dir_prefix() {
local start_kernel_addr=$(echo "${ELF_SYMS}" | sed 's/\[.*\]//' |
  ${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')
[[ -z $start_kernel_addr ]] && return

run_addr2line ${start_kernel_addr} ""
[[ -z $ADDR2LINE_OUT ]] && return

local file_line=${ADDR2LINE_OUT#* at }
if [[ -z $file_line ]] || [[ $file_line = $ADDR2LINE_OUT ]]; then
  return
fi
local prefix=${file_line%init/main.c:*}
if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then
  return
fi

DIR_PREFIX=$prefix
return 0
}

run_readelf() {
local objfile=$1
local out=$(${READELF} --file-header --section-headers --symbols --wide $objfile)

# This assumes that readelf first prints the file header, then the section headers, then the symbols.
# Note: It seems that GNU readelf does not prefix section headers with the "There are X section headers"
# line when multiple options are given, so let's also match with the "Section Headers:" line.
ELF_FILEHEADER=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/q;p')
ELF_SECHEADERS=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/,$p' | sed -n '/Symbol table .* contains [0-9]* entries:/q;p')
ELF_SYMS=$(echo "${out}" | sed -n '/Symbol table .* contains [0-9]* entries:/,$p')
}

check_vmlinux() {
# vmlinux uses absolute addresses in the section table rather than
# section offsets.
IS_VMLINUX=0
local file_type=$(echo "${ELF_FILEHEADER}" |
  ${AWK} '$1 == "Type:" { print $2; exit }')
if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
  IS_VMLINUX=1
fi
}

init_addr2line() {
local objfile=$1

check_vmlinux

ADDR2LINE_ARGS="--functions --pretty-print --inlines --addresses --exe=$objfile"
if [[ $IS_VMLINUX = 1 ]]; then
  # If the executable file is vmlinux, we don't pass section names to
  # addr2line, so we can launch it now as a single long-running process.
  coproc ADDR2LINE_PROC (${ADDR2LINE} ${ADDR2LINE_ARGS})
fi
}

run_addr2line() {
local addr=$1
local sec_name=$2

if [[ $IS_VMLINUX = 1 ]]; then
  # We send to the addr2line process: (1) the address, then (2) a sentinel
  # value, i.e., something that can't be interpreted as a valid address
  # (i.e., ","). This causes addr2line to write out: (1) the answer for
  # our address, then (2) either "?? ??:0" or "0x0...0: ..." (if
  # using binutils' addr2line), or "," (if using LLVM's addr2line).
  echo ${addr} >& "${ADDR2LINE_PROC[1]}"
  echo "," >& "${ADDR2LINE_PROC[1]}"
  local first_line
  read -r first_line <& "${ADDR2LINE_PROC[0]}"
  ADDR2LINE_OUT=$(echo "${first_line}" | sed 's/^0x[0-9a-fA-F]*: //')
  while read -r line <& "${ADDR2LINE_PROC[0]}"; do
   if [[ "$line" == "?? ??:0" ]] || [[ "$line" == "," ]] || [[ $(echo "$line" | ${GREP} "^0x00*: ") ]]; then
    break
   fi
   ADDR2LINE_OUT+=$'\n'$(echo "$line" | sed 's/^0x[0-9a-fA-F]*: //')
  done
else
  # Run addr2line as a single invocation.
  local sec_arg
  [[ -z $sec_name ]] && sec_arg="" || sec_arg="--section=${sec_name}"
  ADDR2LINE_OUT=$(${ADDR2LINE} ${ADDR2LINE_ARGS} ${sec_arg} ${addr} | sed 's/^0x[0-9a-fA-F]*: //')
fi
}

__faddr2line() {
local objfile=$1
local func_addr=$2
local dir_prefix=$3
local print_warnings=$4

local sym_name=${func_addr%+*}
local func_offset=${func_addr#*+}
func_offset=${func_offset%/*}
local user_size=
[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/}

if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then
  warn "bad func+offset $func_addr"
  DONE=1
  return
fi

# Go through each of the object's symbols which match the func name.
# In rare cases there might be duplicates, in which case we print all
# matches.
while read line; do
  local fields=($line)
  local sym_addr=0x${fields[1]}
  local sym_elf_size=${fields[2]}
  local sym_sec=${fields[6]}
  local sec_size
  local sec_name

  # Get the section size:
  sec_size=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
   ${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }')

  if [[ -z $sec_size ]]; then
   warn "bad section size: section: $sym_sec"
   DONE=1
   return
  fi

  # Get the section name:
  sec_name=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
   ${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }')

  if [[ -z $sec_name ]]; then
   warn "bad section name: section: $sym_sec"
   DONE=1
   return
  fi

  # Calculate the symbol size.
  #
  # Unfortunately we can't use the ELF size, because kallsyms
  # also includes the padding bytes in its size calculation.  For
  # kallsyms, the size calculation is the distance between the
  # symbol and the next symbol in a sorted list.
  local sym_size
  local cur_sym_addr
  local found=0
  while read line; do
   local fields=($line)
   cur_sym_addr=0x${fields[1]}
   local cur_sym_elf_size=${fields[2]}
   local cur_sym_name=${fields[7]:-}

   # is_mapping_symbol(cur_sym_name)
   if [[ ${cur_sym_name} =~ ^(\.L|L0|\$) ]]; then
    continue
   fi

   if [[ $cur_sym_addr = $sym_addr ]] &&
      [[ $cur_sym_elf_size = $sym_elf_size ]] &&
      [[ $cur_sym_name = $sym_name ]]; then
    found=1
    continue
   fi

   if [[ $found = 1 ]]; then
    sym_size=$(($cur_sym_addr - $sym_addr))
    [[ $sym_size -lt $sym_elf_size ]] && continue;
    found=2
    break
   fi
  done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2)

  if [[ $found = 0 ]]; then
   warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"
   DONE=1
   return
  fi

  # If nothing was found after the symbol, assume it's the last
  # symbol in the section.
  [[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr))

  if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
   warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"
   DONE=1
   return
  fi

  sym_size=0x$(printf %x $sym_size)

  # Calculate the address from user-supplied offset:
  local addr=$(($sym_addr + $func_offset))
  if [[ -z $addr ]] || [[ $addr = 0 ]]; then
   warn "bad address: $sym_addr + $func_offset"
   DONE=1
   return
  fi
  addr=0x$(printf %x $addr)

  # If the user provided a size, make sure it matches the symbol's size:
  if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then
   [[ $print_warnings = 1 ]] &&
    echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)"
   continue;
  fi

  # Make sure the provided offset is within the symbol's range:
  if [[ $func_offset -gt $sym_size ]]; then
   [[ $print_warnings = 1 ]] &&
    echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"
   continue
  fi

  # In case of duplicates or multiple addresses specified on the
  # cmdline, separate multiple entries with a blank line:
  [[ $FIRST = 0 ]] && echo
  FIRST=0

  echo "$sym_name+$func_offset/$sym_size:"

  # Pass section address to addr2line and strip absolute paths
  # from the output:
  run_addr2line $addr $sec_name
  local output=$(echo "${ADDR2LINE_OUT}" | sed "s; $dir_prefix$\./$*; ;")
  [[ -z $output ]] && continue

  # Default output (non --list):
  if [[ $LIST = 0 ]]; then
   echo "$output" | while read -r line
   do
    echo $line
   done
   DONE=1;
   continue
  fi

  # For --list, show each line with its corresponding source code:
  echo "$output" | while read -r line
  do
   echo
   echo $line
   n=$(echo $line | sed 's/.*:$[0-9]\+$.*/\1/g')
   n1=$[$n-5]
   n2=$[$n+5]
   f=$(echo $line | sed 's/.*at $.\+$:.*/\1/g')
   ${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
  done

  DONE=1

done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
}

[[ $# -lt 2 ]] && usage

objfile=$1

LIST=0
[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1

[[ ! -f $objfile ]] && die "can't find objfile $objfile"
shift

run_readelf $objfile

echo "${ELF_SECHEADERS}" | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"

init_addr2line $objfile

DIR_PREFIX=supercalifragilisticexpialidocious
find_dir_prefix

FIRST=1
while [[ $# -gt 0 ]]; do
func_addr=$1
shift

# print any matches found
DONE=0
__faddr2line $objfile $func_addr $DIR_PREFIX 0

# if no match was found, print warnings
if [[ $DONE = 0 ]]; then
  __faddr2line $objfile $func_addr $DIR_PREFIX 1
  warn "no match for $func_addr"
fi
done

Quelle faddr2line Sprache: unbekannt

[ Dauer der Verarbeitung: 0.28 Sekunden (vorverarbeitet) ]