public inbox for gnu-gabi@sourceware.org
 help / color / mirror / Atom feed
* RFC: Add SHT_GNU_PHDRS
@ 2018-01-01  0:00 H.J. Lu
  2018-01-01  0:00 ` Carlos O'Donell
                   ` (2 more replies)
  0 siblings, 3 replies; 25+ messages in thread
From: H.J. Lu @ 2018-01-01  0:00 UTC (permalink / raw)
  To: gnu-gabi, Binutils

When -z separate-code is used to create executable, ld won't place any
data in the code-only PT_LOAD segment.  If there are no data sections
placed before the code-only PT_LOAD segment, the program headers
won't be mapped into any PT_LOAD segment.  When the executable tries
to access it (based on the program header address passed in AT_PHDR),
it will lead to segfault.

I am proposing

#define SHT_GNU_PHDRS  0x6ffffff4  /* Dummy section for program header */

This is a special read-only SHF_ALLOC zero-size data section.  It is the
first output section, which will force a data PT_LOAD segment with program
header before the code-only PT_LOAD segment,

-- 
H.J.

^ permalink raw reply	[flat|nested] 25+ messages in thread

end of thread, other threads:[~2018-09-28 14:31 UTC | newest]

Thread overview: 25+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-01-01  0:00 RFC: Add SHT_GNU_PHDRS H.J. Lu
2018-01-01  0:00 ` Carlos O'Donell
2018-01-01  0:00   ` H.J. Lu
     [not found] ` <CAORpzuOWtHeqBLEE+MMN4-TZyp6Z1r-MdmyNv7Zj-BhxMstr=g@mail.gmail.com>
2018-01-01  0:00   ` H.J. Lu
2018-01-01  0:00 ` Florian Weimer
2018-01-01  0:00   ` Jan Beulich
2018-01-01  0:00     ` Florian Weimer
2018-01-01  0:00       ` Szabolcs Nagy
2018-01-01  0:00         ` H.J. Lu
2018-01-01  0:00           ` Florian Weimer
2018-01-01  0:00             ` H.J. Lu
2018-01-01  0:00               ` Florian Weimer
2018-01-01  0:00                 ` Michael Matz
2018-01-01  0:00                   ` Florian Weimer
2018-01-01  0:00                     ` Michael Matz
2018-01-01  0:00                 ` Carlos O'Donell
2018-01-01  0:00                   ` H.J. Lu
2018-01-01  0:00                     ` Carlos O'Donell
2018-01-01  0:00                       ` H.J. Lu
2018-01-01  0:00                         ` Carlos O'Donell
2018-01-01  0:00                   ` Cary Coutant
2018-01-01  0:00                     ` H.J. Lu
2018-01-01  0:00                       ` Rich Felker
2018-01-01  0:00         ` Florian Weimer
2018-01-01  0:00           ` Cary Coutant

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).