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Kernel dso support for 'dl_iterate_phdr' function

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Kernel provides virtual DSO for stack unwinding/exception handlind info for
signal usage case. Stack unwinding routines use 'dl_iterate_phdr' function
for additional DWARF info gathering from DSOs. Patch enables virtual DSO
enumeration via dl_iterate_phdr function.

Signed-off-by: Sergey Melnikov <sergey.melnikov@intel.com>
Change-Id: Ic2882b28f40b456a088bc1e63c50cbfda7e4a102
This commit is contained in:
Sergey Melnikov
2013-01-25 16:40:13 +04:00
committed by Elliott Hughes
parent bfacb603e4
commit c45087bffa
5 changed files with 186 additions and 25 deletions
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24
linker/linker.cpp
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@@ -1585,6 +1585,28 @@ static bool soinfo_link_image(soinfo* si) {
return true;
}
/*
* This function add vdso to internal dso list.
* It helps to stack unwinding through signal handlers.
* Also, it makes bionic more like glibc.
*/
static void add_vdso(KernelArgumentBlock& args UNUSED) {
#ifdef AT_SYSINFO_EHDR
Elf32_Ehdr* ehdr_vdso = reinterpret_cast<Elf32_Ehdr*>(args.getauxval(AT_SYSINFO_EHDR));
soinfo* si = soinfo_alloc("[vdso]");
si->phdr = reinterpret_cast<Elf32_Phdr*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff);
si->phnum = ehdr_vdso->e_phnum;
si->link_map.l_name = si->name;
for (size_t i = 0; i < si->phnum; ++i) {
if (si->phdr[i].p_type == PT_LOAD) {
si->link_map.l_addr = reinterpret_cast<Elf32_Addr>(ehdr_vdso) - si->phdr[i].p_vaddr;
break;
}
}
#endif
}
/*
* This code is called after the linker has linked itself and
* fixed it's own GOT. It is safe to make references to externs
@@ -1710,6 +1732,8 @@ static Elf32_Addr __linker_init_post_relocation(KernelArgumentBlock& args, Elf32
exit(EXIT_FAILURE);
}
add_vdso(args);
si->CallPreInitConstructors();
for (size_t i = 0; gLdPreloads[i] != NULL; ++i) {