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PackMach* filters only the [1st] largest executable LC_SEGMNET

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This commit is contained in:
John Reiser 2007-02-10 17:47:04 -08:00
parent 23c629f2aa
commit 7324f4c3d1
1 changed files with 17 additions and 2 deletions
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19
src/p_mach.cpp
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@ -408,6 +408,17 @@ void PackMachBase<T>::pack2(OutputFile *fo, Filter &ft) // append compressed bo
uip->ui_pass = 0;
ft.addvalue = 0;
// Packer::compressWithFilters chooses a filter for us, and the stubs
// can handle only one filter, and most filters are for executable
// instructions. So filter only the largest executable segment.
unsigned exe_filesize_max = 0;
for (k = 0; k < n_segment; ++k)
if (Mach_segment_command::LC_SEGMENT==msegcmd[k].cmd
&& 0!=(Mach_segment_command::VM_PROT_EXECUTE & msegcmd[k].initprot)
&& exe_filesize_max < msegcmd[k].filesize) {
exe_filesize_max = msegcmd[k].filesize;
}
int nx = 0;
for (k = 0; k < n_segment; ++k)
if (Mach_segment_command::LC_SEGMENT==msegcmd[k].cmd
@ -419,9 +430,13 @@ void PackMachBase<T>::pack2(OutputFile *fo, Filter &ft) // append compressed bo
x.offset += delta;
x.size -= delta;
}
bool const do_filter = (msegcmd[k].filesize==exe_filesize_max)
&& 0!=(Mach_segment_command::VM_PROT_EXECUTE & msegcmd[k].initprot);
packExtent(x, total_in, total_out,
((Mach_segment_command::VM_PROT_EXECUTE & msegcmd[k].initprot)
? &ft : 0 ), fo, hdr_u_len );
(do_filter ? &ft : 0 ), fo, hdr_u_len );
if (do_filter) {
exe_filesize_max = 0;
}
hdr_u_len = 0;
++nx;
}