binutils/embedspu.sh

   1 #! /bin/sh
   2 # Embed an SPU ELF executable into a PowerPC object file.
   3 #
   4 # Copyright 2006, 2007 Free Software Foundation, Inc.
   5 #
   6 # This file is part of GNU Binutils.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write to the Free Software
  20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  21 # 02110-1301, USA.
  22
  23 usage ()
  24 {
  25   echo "Usage: embedspu [flags] symbol_name input_filename output_filename"
  26   echo
  27   echo "        input_filename:  SPU ELF executable to be embedded"
  28   echo "        output_filename: Resulting PowerPC object file"
  29   echo "        symbol_name:     Name of program handle struct to be defined"
  30   echo "        flags:           GCC flags defining PowerPC object file format"
  31   echo "                         (e.g. -m32 or -m64)"
  32   exit 1
  33 }
  34
  35 program_transform_name=
  36 mydir=`dirname "$0"`
  37
  38 find_prog ()
  39 {
  40   prog=`echo $1 | sed "$program_transform_name"`
  41   which $prog > /dev/null 2> /dev/null && return 0
  42   prog="$mydir/$prog"
  43   test -x "$prog" && return 0
  44   prog="$mydir/$1"
  45   test -x "$prog" && return 0
  46   prog=`echo $1 | sed "$program_transform_name"`
  47   return 1
  48 }
  49
  50 SYMBOL=
  51 INFILE=
  52 OUTFILE=
  53 FLAGS=
  54
  55 parse_args ()
  56 {
  57   while test -n "$1"; do
  58     case "$1" in
  59       -*) FLAGS="${FLAGS} $1" ;;
  60       *)  if test -z "$SYMBOL"; then
  61             SYMBOL="$1"
  62           elif test -z "$INFILE"; then
  63             INFILE="$1"
  64           elif test -z "$OUTFILE"; then
  65             OUTFILE="$1"
  66           else
  67             echo "Too many arguments!"
  68             usage
  69           fi ;;
  70     esac
  71     shift
  72   done
  73   if test -z "$OUTFILE"; then
  74     usage
  75   fi
  76   if test ! -r "$INFILE"; then
  77     echo "${INFILE}: File not found"
  78     usage
  79   fi
  80 }
  81
  82 main ()
  83 {
  84   parse_args "$@"
  85
  86   # Find a powerpc gcc.  Support running from a combined tree build.
  87   if test -x "$mydir/../gcc/xgcc"; then
  88     CC="$mydir/../gcc/xgcc -B$mydir/../gcc/"
  89   else
  90     find_prog gcc
  91     if test $? -ne 0; then
  92       echo "Cannot find $prog"
  93       exit 1
  94     fi
  95     CC="$prog"
  96   fi
  97
  98   # Find readelf.  Any old readelf should do.  We only want to read syms.
  99   find_prog readelf
 100   if test $? -ne 0; then
 101     if which readelf > /dev/null 2> /dev/null; then
 102       prog=readelf
 103     else
 104       echo "Cannot find $prog"
 105       exit 1
 106     fi
 107   fi
 108   READELF="$prog"
 109
 110   # Sanity check the input file
 111   if ! ${READELF} -h ${INFILE} | grep 'Class:.*ELF32' >/dev/null 2>/dev/null \
 112      || ! ${READELF} -h ${INFILE} | grep 'Type:.*EXEC' >/dev/null 2>/dev/null \
 113      || ! ${READELF} -h ${INFILE} | egrep 'Machine:.*(SPU|17)' >/dev/null 2>/dev/null
 114   then
 115     echo "${INFILE}: Does not appear to be an SPU executable"
 116     exit 1
 117   fi
 118
 119   # Build embedded SPU image.
 120   # 1. The whole SPU ELF file is written to .rodata.speelf
 121   # 2. Symbols starting with the string "_EAR_" in the SPU ELF image are
 122   #    special.  They allow an SPU program to access corresponding symbols
 123   #    (ie. minus the _EAR_ prefix), in the PowerPC program.  _EAR_ without
 124   #    a suffix is used to refer to the addrress of the SPU image in
 125   #    PowerPC address space.  _EAR_* symbols must all be defined in one
 126   #    section at 16 byte intervals.
 127   #    Find all _EAR_ symbols using readelf, sort by address, and write
 128   #    the address of the corresponding PowerPC symbol in a table built
 129   #    in .data.spetoe.
 130   # 3. Write a struct spe_program_handle to .data.
 131   ${CC} ${FLAGS} -x assembler-with-cpp -nostartfiles -nostdlib \
 132         -Wa,-mbig -Wl,-r -Wl,-x -o ${OUTFILE} - <<EOF
 133  .section .rodata.speelf,"a",@progbits
 134  .p2align 7
 135 __speelf__:
 136  .incbin "${INFILE}"
 137
 138  .section .data.spetoe,"aw",@progbits
 139  .p2align 7
 140 __spetoe__:
 141 `${READELF} -s -W ${INFILE} | grep ' _EAR_' | sort -k 2 | awk \
 142 'BEGIN { \
 143   last_addr = 0; \
 144   last_sym = ""; \
 145 } \
 146 last_addr != 0 && strtonum("0x" $2) != last_addr + 16 { \
 147         print "#error Symbols " last_sym " and " $8 " are not 16 bytes apart!"; \
 148 } \
 149 { last_addr = strtonum("0x" $2); \
 150   last_sym = $8; \
 151 } \
 152 $8 == "_EAR_" { \
 153         print "#ifdef _LP64"; \
 154         print " .quad __speelf__, 0"; \
 155         print "#else"; \
 156         print " .int 0, __speelf__, 0, 0"; \
 157         print "#endif"; \
 158 } \
 159 $8 != "_EAR_" { \
 160         print "#ifdef _LP64"; \
 161         print " .quad " substr($8, 6) ", 0"; \
 162         print "#else"; \
 163         print " .int 0, " substr($8, 6) ", 0, 0"; \
 164         print "#endif"; \
 165 }'`
 166
 167  .section .data,"aw",@progbits
 168  .globl ${SYMBOL}
 169 # fill in a struct spe_program_handle
 170 #ifdef _LP64
 171  .p2align 3
 172 ${SYMBOL}:
 173  .int 24
 174  .int 0
 175  .quad __speelf__
 176  .quad __spetoe__
 177 #else
 178  .p2align 2
 179 ${SYMBOL}:
 180  .int 12
 181  .int __speelf__
 182  .int __spetoe__
 183 #endif
 184 EOF
 185 }
 186
 187 main "$@"