diff options
| author | Christophe Lyon <christophe.lyon@st.com> | 2018-07-04 17:55:34 +0200 |
|---|---|---|
| committer | Waldemar Brodkorb <wbrodkorb@conet.de> | 2018-08-10 16:02:45 +0200 |
| commit | 7f07872b8aea16611890865700fbfefd586bc1fb (patch) | |
| tree | bd734164cf522b2b6950d90338d48b7d21789845 /libpthread | |
| parent | 4d6b4178c8e49dd6d3067a399e2a49d5379b7750 (diff) | |
nptl: Use linker-defined symbol to find start of .tdata section.
phdr->p_vaddr of TLS segment is not a valid value for FDPIC so we can
either translate phdr->p_vaddr using loadmap (not easy here) or use a
new linker script defined symbol, whih this patch does.
* libpthread/nptl/sysdeps/generic/libc-tls.c (__tdata_start): Declare.
(__libc_setup_tls): Support __FDPIC__.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
Diffstat (limited to 'libpthread')
| -rw-r--r-- | libpthread/nptl/sysdeps/generic/libc-tls.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/generic/libc-tls.c b/libpthread/nptl/sysdeps/generic/libc-tls.c index 58e77ff10..725f3dfc7 100644 --- a/libpthread/nptl/sysdeps/generic/libc-tls.c +++ b/libpthread/nptl/sysdeps/generic/libc-tls.c @@ -36,6 +36,11 @@ extern ElfW(Phdr) *_dl_phdr; extern size_t _dl_phnum; +#ifdef __FDPIC__ +/* phdr->p_vaddr is not valid in FDPIC mode. To find tdata start we + use the linker script defined symbol __tdata_start. */ +extern int __tdata_start; +#endif static dtv_t static_dtv[2 + TLS_SLOTINFO_SURPLUS]; @@ -130,7 +135,11 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign) /* Remember the values we need. */ memsz = phdr->p_memsz; filesz = phdr->p_filesz; +#ifdef __FDPIC__ + initimage = (void *) &__tdata_start; +#else initimage = (void *) phdr->p_vaddr; +#endif align = phdr->p_align; if (phdr->p_align > max_align) max_align = phdr->p_align; |