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| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-02-26 23:40:25 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-04 22:50:49 +0100 |
| commit | 49db46a67bec9ca9e29ece4729a876195877af50 (patch) | |
| tree | 9c20f9fa210d1befe2ea2346b8cd9452bcef0517 /arch/x86/kernel/entry_32.S | |
| parent | x86/asm/64: Open-code register save/restore in trace_hardirqs*() thunks (diff) | |
| download | linux-49db46a67bec9ca9e29ece4729a876195877af50.tar.xz linux-49db46a67bec9ca9e29ece4729a876195877af50.zip | |
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/kernel/entry_32.S')
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 7e0323cc0b7d..e33ba51b1069 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -1234,20 +1234,13 @@ error_code: /*CFI_REL_OFFSET es, 0*/ pushl_cfi %ds /*CFI_REL_OFFSET ds, 0*/ - pushl_cfi %eax - CFI_REL_OFFSET eax, 0 - pushl_cfi %ebp - CFI_REL_OFFSET ebp, 0 - pushl_cfi %edi - CFI_REL_OFFSET edi, 0 - pushl_cfi %esi - CFI_REL_OFFSET esi, 0 - pushl_cfi %edx - CFI_REL_OFFSET edx, 0 - pushl_cfi %ecx - CFI_REL_OFFSET ecx, 0 - pushl_cfi %ebx - CFI_REL_OFFSET ebx, 0 + pushl_cfi_reg eax + pushl_cfi_reg ebp + pushl_cfi_reg edi + pushl_cfi_reg esi + pushl_cfi_reg edx + pushl_cfi_reg ecx + pushl_cfi_reg ebx cld movl $(__KERNEL_PERCPU), %ecx movl %ecx, %fs |