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#!/usr/bin/env python
# Script to arrange sections to ensure fixed offsets.
#
# Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import sys
def main():
# Get output name
outname = sys.argv[1]
# Read in section names and sizes
# sections = [(size, align, name), ...]
sections = []
for line in sys.stdin.readlines():
try:
idx, name, size, vma, lma, fileoff, align = line.split()
if align[:3] != '2**':
continue
sections.append((int(size, 16), 2**int(align[3:]), name))
except:
pass
doLayout(sections, outname)
def alignpos(pos, alignbytes):
mask = alignbytes - 1
return (pos + mask) & ~mask
MAXPOS = 0x10000
def doLayout(sections, outname):
textsections = []
rodatasections = []
datasections = []
# fixedsections = [(addr, sectioninfo, extasectionslist), ...]
fixedsections = []
# canrelocate = [(sectioninfo, list), ...]
canrelocate = []
# Find desired sections.
for section in sections:
size, align, name = section
if name[:11] == '.fixedaddr.':
addr = int(name[11:], 16)
fixedsections.append((addr, section, []))
if align != 1:
print "Error: Fixed section %s has non-zero alignment (%d)" % (
name, align)
sys.exit(1)
if name[:6] == '.text.':
textsections.append(section)
canrelocate.append((section, textsections))
if name[:17] == '.rodata.__func__.' or name == '.rodata.str1.1':
rodatasections.append(section)
#canrelocate.append((section, rodatasections))
if name[:8] == '.data16.':
datasections.append(section)
#canrelocate.append((section, datasections))
# Find freespace in fixed address area
fixedsections.sort()
# fixedAddr = [(freespace, sectioninfo), ...]
fixedAddr = []
for i in range(len(fixedsections)):
fixedsectioninfo = fixedsections[i]
addr, section, extrasectionslist = fixedsectioninfo
if i == len(fixedsections) - 1:
nextaddr = MAXPOS
else:
nextaddr = fixedsections[i+1][0]
avail = nextaddr - addr - section[0]
fixedAddr.append((avail, fixedsectioninfo))
# Attempt to fit other sections into fixed area
fixedAddr.sort()
canrelocate.sort()
totalused = 0
for freespace, fixedsectioninfo in fixedAddr:
fixedaddr, fixedsection, extrasections = fixedsectioninfo
addpos = fixedaddr + fixedsection[0]
totalused += fixedsection[0]
nextfixedaddr = addpos + freespace
# print "Filling section %x uses %d, next=%x, available=%d" % (
# fixedaddr, fixedsection[0], nextfixedaddr, freespace)
while 1:
canfit = None
for fixedaddrinfo in canrelocate:
fitsection, inlist = fixedaddrinfo
fitsize, fitalign, fitname = fitsection
if addpos + fitsize > nextfixedaddr:
# Can't fit and nothing else will fit.
break
fitnextaddr = alignpos(addpos, fitalign) + fitsize
# print "Test %s - %x vs %x" % (
# fitname, fitnextaddr, nextfixedaddr)
if fitnextaddr > nextfixedaddr:
# This item can't fit.
continue
canfit = (fitnextaddr, fixedaddrinfo)
if canfit is None:
break
# Found a section that can fit.
fitnextaddr, fixedaddrinfo = canfit
canrelocate.remove(fixedaddrinfo)
fitsection, inlist = fixedaddrinfo
inlist.remove(fitsection)
extrasections.append(fitsection)
addpos = fitnextaddr
totalused += fitsection[0]
# print " Adding %s (size %d align %d) pos=%x avail=%d" % (
# fitsection[2], fitsection[0], fitsection[1]
# , fitnextaddr, nextfixedaddr - fitnextaddr)
firstfixed = fixedsections[0][0]
total = MAXPOS-firstfixed
print "Fixed space: 0x%x-0x%x total: %d used: %d Percent used: %.1f%%" % (
firstfixed, MAXPOS, total, totalused,
(float(totalused) / total) * 100.0)
# Write regular sections
output = open(outname, 'wb')
for section in textsections:
name = section[2]
output.write("*(%s)\n" % (name,))
output.write("code16_rodata = . ;\n")
for section in rodatasections:
name = section[2]
output.write("*(%s)\n" % (name,))
for section in datasections:
name = section[2]
output.write("*(%s)\n" % (name,))
# Write fixed sections
output.write("freespace1_start = . ;\n")
first = 1
for addr, section, extrasections in fixedsections:
name = section[2]
output.write(". = ( 0x%x - code16_start ) ;\n" % (addr,))
if first:
first = 0
output.write("freespace1_end = . ;\n")
output.write("*(%s)\n" % (name,))
for extrasection in extrasections:
name = extrasection[2]
output.write("*(%s)\n" % (name,))
if __name__ == '__main__':
main()
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