diff options
| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-02-27 01:40:25 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-05 00:50:49 +0300 |
| commit | 49db46a67bec9ca9e29ece4729a876195877af50 (patch) | |
| tree | 9c20f9fa210d1befe2ea2346b8cd9452bcef0517 /arch/x86/lib/thunk_64.S | |
| parent | 69e8544cd0056e02965ffb5e8414fb7501a2ee2e (diff) | |
| download | linux-49db46a67bec9ca9e29ece4729a876195877af50.tar.xz | |
x86/asm: Introduce push/pop macros which generate CFI_REL_OFFSET and CFI_RESTORE
Sequences:
pushl_cfi %reg
CFI_REL_OFFSET reg, 0
and:
popl_cfi %reg
CFI_RESTORE reg
happen quite often. This patch adds macros which generate them.
No assembly changes (verified with objdump -dr vmlinux.o).
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1421017655-25561-1-git-send-email-dvlasenk@redhat.com
Link: http://lkml.kernel.org/r/2202eb90f175cf45d1b2d1c64dbb5676a8ad07ad.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/lib/thunk_64.S')
| -rw-r--r-- | arch/x86/lib/thunk_64.S | 54 |
1 files changed, 18 insertions, 36 deletions
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S index 8ec443a0777b..f89ba4e93025 100644 --- a/arch/x86/lib/thunk_64.S +++ b/arch/x86/lib/thunk_64.S @@ -17,24 +17,15 @@ CFI_STARTPROC /* this one pushes 9 elems, the next one would be %rIP */ - pushq_cfi %rdi - CFI_REL_OFFSET rdi, 0 - pushq_cfi %rsi - CFI_REL_OFFSET rsi, 0 - pushq_cfi %rdx - CFI_REL_OFFSET rdx, 0 - pushq_cfi %rcx - CFI_REL_OFFSET rcx, 0 - pushq_cfi %rax - CFI_REL_OFFSET rax, 0 - pushq_cfi %r8 - CFI_REL_OFFSET r8, 0 - pushq_cfi %r9 - CFI_REL_OFFSET r9, 0 - pushq_cfi %r10 - CFI_REL_OFFSET r10, 0 - pushq_cfi %r11 - CFI_REL_OFFSET r11, 0 + pushq_cfi_reg rdi + pushq_cfi_reg rsi + pushq_cfi_reg rdx + pushq_cfi_reg rcx + pushq_cfi_reg rax + pushq_cfi_reg r8 + pushq_cfi_reg r9 + pushq_cfi_reg r10 + pushq_cfi_reg r11 .if \put_ret_addr_in_rdi /* 9*8(%rsp) is return addr on stack */ @@ -69,24 +60,15 @@ CFI_STARTPROC CFI_ADJUST_CFA_OFFSET 9*8 restore: - popq_cfi %r11 - CFI_RESTORE r11 - popq_cfi %r10 - CFI_RESTORE r10 - popq_cfi %r9 - CFI_RESTORE r9 - popq_cfi %r8 - CFI_RESTORE r8 - popq_cfi %rax - CFI_RESTORE rax - popq_cfi %rcx - CFI_RESTORE rcx - popq_cfi %rdx - CFI_RESTORE rdx - popq_cfi %rsi - CFI_RESTORE rsi - popq_cfi %rdi - CFI_RESTORE rdi + popq_cfi_reg r11 + popq_cfi_reg r10 + popq_cfi_reg r9 + popq_cfi_reg r8 + popq_cfi_reg rax + popq_cfi_reg rcx + popq_cfi_reg rdx + popq_cfi_reg rsi + popq_cfi_reg rdi ret CFI_ENDPROC _ASM_NOKPROBE(restore) |