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32-bit shared libs reduce Phdr[1].p_align to 4096, like 64-bit.

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This saves space when PAGE_SIZE is larger than 4096: MIPS, etc.
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2017-10-20 16:35:27 -07:00
parent 06f6e47ebf
commit c652626a37
1 changed files with 8 additions and 5 deletions
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13
src/p_lx_elf.cpp
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@ -375,6 +375,7 @@ off_t PackLinuxElf32::pack3(OutputFile *fo, Filter &ft)
for (int j = e_phnum; --j>=0; ++phdr) {
unsigned const len = get_te32(&phdr->p_filesz);
unsigned const ioff = get_te32(&phdr->p_offset);
unsigned align= get_te32(&phdr->p_align);
unsigned const type = get_te32(&phdr->p_type);
if (phdr->PT_INTERP==type) {
// Rotate to highest position, so it can be lopped
@ -388,11 +389,13 @@ off_t PackLinuxElf32::pack3(OutputFile *fo, Filter &ft)
}
if (phdr->PT_LOAD32==type) {
if (xct_off < ioff) { // Slide up non-first PT_LOAD.
fi->seek(ioff, SEEK_SET);
fi->readx(ibuf, len);
off += ~page_mask & (ioff - off);
fo->seek(off, SEEK_SET);
fo->write(ibuf, len);
if ((1u<<12) < align) {
align = 1u<<12;
set_te32(&phdr->p_align, align);
}
off += (align-1) & (ioff - off);
fi->seek(ioff, SEEK_SET); fi->readx(ibuf, len);
fo->seek( off, SEEK_SET); fo->write(ibuf, len);
so_slide = off - ioff;
set_te32(&phdr->p_offset, so_slide + ioff);
}