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Annotation of qemu/roms/seabios/tools/vgafixup.py, revision 1.1

1.1     ! root        1: #!/usr/bin/env python
        !             2: # Work around x86emu bugs by replacing problematic instructions.
        !             3: #
        !             4: # Copyright (C) 2012  Kevin O'Connor <[email protected]>
        !             5: #
        !             6: # This file may be distributed under the terms of the GNU GPLv3 license.
        !             7: 
        !             8: # The x86emu code widely used in Linux distributions when running Xorg
        !             9: # in vesamode is known to have issues with "retl", "leavel", "entryl",
        !            10: # and some variants of "calll".  This code modifies those instructions
        !            11: # (ret and leave) that are known to be generated by gcc to avoid
        !            12: # triggering the x86emu bugs.
        !            13: 
        !            14: # It is also known that the Windows vgabios emulator has issues with
        !            15: # addressing negative offsets to the %esp register.  That has been
        !            16: # worked around by not using the gcc paremeter "-fomit-frame-pointer"
        !            17: # when compiling.
        !            18: 
        !            19: import sys
        !            20: 
        !            21: def main():
        !            22:     infilename, outfilename = sys.argv[1:]
        !            23:     infile = open(infilename, 'rb')
        !            24:     out = []
        !            25:     for line in infile:
        !            26:         sline = line.strip()
        !            27:         if sline == 'ret':
        !            28:             out.append('retw $2\n')
        !            29:         elif sline == 'leave':
        !            30:             out.append('movl %ebp, %esp ; popl %ebp\n')
        !            31:         else:
        !            32:             out.append(line)
        !            33:     infile.close()
        !            34:     outfile = open(outfilename, 'wb')
        !            35:     outfile.write(''.join(out))
        !            36:     outfile.close()
        !            37: 
        !            38: if __name__ == '__main__':
        !            39:     main()

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