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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-07-12 06:29:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-07-12 06:30:08 -0700 |
| commit | 61655555aa8c2cd5f5351ef7d0aea6dfce046135 (patch) | |
| tree | 9bdbc75cb7087328948fda4cbde2f784dbd90bba /sysdeps | |
| parent | cf1ad5b3add36790cbf58a3972c492a8f1632929 (diff) | |
| download | glibc-61655555aa8c2cd5f5351ef7d0aea6dfce046135.zip glibc-61655555aa8c2cd5f5351ef7d0aea6dfce046135.tar.gz glibc-61655555aa8c2cd5f5351ef7d0aea6dfce046135.tar.bz2 | |
x86-64: Properly align stack in _dl_tlsdesc_dynamic [BZ #20309]
Since _dl_tlsdesc_dynamic is called via PLT, we need to add 8 bytes for
push in the PLT entry to align the stack.
[BZ #20309]
* configure.ac (have-mtls-dialect-gnu2): Set to yes if
-mtls-dialect=gnu2 works.
* configure: Regenerated.
* elf/Makefile [have-mtls-dialect-gnu2 = yes]
(tests): Add tst-gnu2-tls1.
(modules-names): Add tst-gnu2-tls1mod.
($(objpfx)tst-gnu2-tls1): New.
(tst-gnu2-tls1mod.so-no-z-defs): Likewise.
(CFLAGS-tst-gnu2-tls1mod.c): Likewise.
* elf/tst-gnu2-tls1.c: New file.
* elf/tst-gnu2-tls1mod.c: Likewise.
* sysdeps/x86_64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add 8
bytes for push in the PLT entry to align the stack.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/x86_64/dl-tlsdesc.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/sysdeps/x86_64/dl-tlsdesc.S b/sysdeps/x86_64/dl-tlsdesc.S index 3cb7c3d..777f30b 100644 --- a/sysdeps/x86_64/dl-tlsdesc.S +++ b/sysdeps/x86_64/dl-tlsdesc.S @@ -163,14 +163,15 @@ _dl_tlsdesc_dynamic: /* The PLT entry will have pushed the link_map pointer. */ _dl_tlsdesc_resolve_rela: cfi_adjust_cfa_offset (8) - /* Save all call-clobbered registers. */ - subq $72, %rsp - cfi_adjust_cfa_offset (72) + /* Save all call-clobbered registers. Add 8 bytes for push in + the PLT entry to align the stack. */ + subq $80, %rsp + cfi_adjust_cfa_offset (80) movq %rax, (%rsp) movq %rdi, 8(%rsp) movq %rax, %rdi /* Pass tlsdesc* in %rdi. */ movq %rsi, 16(%rsp) - movq 72(%rsp), %rsi /* Pass link_map* in %rsi. */ + movq 80(%rsp), %rsi /* Pass link_map* in %rsi. */ movq %r8, 24(%rsp) movq %r9, 32(%rsp) movq %r10, 40(%rsp) @@ -187,8 +188,8 @@ _dl_tlsdesc_resolve_rela: movq 48(%rsp), %r11 movq 56(%rsp), %rdx movq 64(%rsp), %rcx - addq $80, %rsp - cfi_adjust_cfa_offset (-80) + addq $88, %rsp + cfi_adjust_cfa_offset (-88) jmp *(%rax) cfi_endproc .size _dl_tlsdesc_resolve_rela, .-_dl_tlsdesc_resolve_rela |