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(unexec): Consider a section to precede the .bss section

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if its addresses overlap that of .bss.
(unexec) [NS_IMPL_GNUSTEP]: Copy ObjC-related data from old file
instead of dumping process.
This commit is contained in:
YAMAMOTO Mitsuharu 2009-05-06 02:27:51 +00:00
parent d01179d907
commit bcda200f6a
2 changed files with 68 additions and 7 deletions
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11
src/ChangeLog
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@ -1,3 +1,14 @@
2009-05-06 YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
* keyboard.h (add_user_signal): Fix typo in extern.
* lisp.h (add_user_signal): Remove extern.
* unexelf.c (unexec): Consider a section to precede the .bss section
if its addresses overlap that of .bss.
(unexec) [NS_IMPL_GNUSTEP]: Copy ObjC-related data from old file
instead of dumping process.
2009-05-06 Stefan Monnier <monnier@iro.umontreal.ca>
* keyboard.c (syms_of_keyboard): Staticpro pending_funcalls.

64
src/unexelf.c
View file

@ -985,9 +985,29 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
placed after the .bss section. Overlap can occur if the
section just before .bss has less-strict alignment; this
was observed between .symtab and .bss on Solaris 2.5.1
(sparc) with GCC snapshot 960602. */
(sparc) with GCC snapshot 960602.
if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset)
> dump -h temacs
temacs:
**** SECTION HEADER TABLE ****
[No] Type Flags Addr Offset Size Name
Link Info Adralgn Entsize
[22] 1 3 0x335150 0x315150 0x4 .data.rel.local
0 0 0x4 0
[23] 8 3 0x335158 0x315158 0x42720 .bss
0 0 0x8 0
[24] 2 0 0 0x315154 0x1c9d0 .symtab
25 1709 0x4 0x10
*/
if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset
|| (NEW_SECTION_H (nn).sh_offset + NEW_SECTION_H (nn).sh_size
> new_data2_offset))
NEW_SECTION_H (nn).sh_offset += new_data2_incr;
/* Any section that was originally placed after the section
@ -1206,11 +1226,41 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
for (; symp < symendp; symp ++)
if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
|| strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
{
if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
|| strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
/* Strictly speaking, #ifdef below is not necessary. But we
keep it to indicate that this kind of change may also be
necessary for other unexecs to support GNUstep. */
#ifdef NS_IMPL_GNUSTEP
/* ObjC runtime modifies the values of some data structures
such as classes and selectors in the .data section after
loading. As the dump process copies the .data section
from the current process, that causes problems when the
modified classes are reinitialized in the dumped
executable. We copy such data from the old file, not
from the current process. */
if (strncmp ((char *) (symnames + symp->st_name),
"_OBJC_", sizeof ("_OBJC_") - 1) == 0)
{
caddr_t old, new;
new = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr)
+ NEW_SECTION_H (symp->st_shndx).sh_offset + new_base);
/* "Unpatch" index. */
nn = symp->st_shndx;
if (nn > old_bss_index)
nn--;
old = ((symp->st_value - NEW_SECTION_H (symp->st_shndx).sh_addr)
+ OLD_SECTION_H (nn).sh_offset + old_base);
memcpy (new, old, symp->st_size);
}
#endif
}
}
/* This loop seeks out relocation sections for the data section, so