[PATCH v5 04/27] x86: entry, annotate THUNKs
From: Jiri Slaby <hidden>
Date: 2017-11-30 14:47:04
Also in:
lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit), x86 entry code · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski
Place SYM_CODE_START_NOALIGN and SYM_CODE_END around the THUNK macro body, given it generates: 1) non-C-like functions, and 2) was not marked as aligned. The common tail .L_restore is put inside SYM_CODE_START_LOCAL_NOALIGN and SYM_CODE_END too. The result: Value Size Type Bind Vis Ndx Name 0000 28 NOTYPE GLOBAL DEFAULT 1 trace_hardirqs_on_thunk 001c 28 NOTYPE GLOBAL DEFAULT 1 trace_hardirqs_off_thunk 0038 24 NOTYPE GLOBAL DEFAULT 1 lockdep_sys_exit_thunk 0050 24 NOTYPE GLOBAL DEFAULT 1 ___preempt_schedule 0068 24 NOTYPE GLOBAL DEFAULT 1 ___preempt_schedule_notrace Signed-off-by: Jiri Slaby <redacted> Cc: Thomas Gleixner <redacted> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <x86@kernel.org> --- arch/x86/entry/thunk_32.S | 4 ++-- arch/x86/entry/thunk_64.S | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/x86/entry/thunk_32.S b/arch/x86/entry/thunk_32.S
index fee6bc79b987..422354b204f4 100644
--- a/arch/x86/entry/thunk_32.S
+++ b/arch/x86/entry/thunk_32.S@@ -10,8 +10,7 @@ /* put return address in eax (arg1) */ .macro THUNK name, func, put_ret_addr_in_eax=0 - .globl \name -\name: +SYM_CODE_START_NOALIGN(\name) pushl %eax pushl %ecx pushl %edx
@@ -27,6 +26,7 @@ popl %eax ret _ASM_NOKPROBE(\name) +SYM_CODE_END(\name) .endm #ifdef CONFIG_TRACE_IRQFLAGS
diff --git a/arch/x86/entry/thunk_64.S b/arch/x86/entry/thunk_64.S
index be36bf4e0957..ea5e2b0e6611 100644
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S@@ -12,9 +12,7 @@ /* rdi: arg1 ... normal C conventions. rax is saved/restored. */ .macro THUNK name, func, put_ret_addr_in_rdi=0 - .globl \name - .type \name, @function -\name: +SYM_CODE_START_NOALIGN(\name) pushq %rbp movq %rsp, %rbp
@@ -36,6 +34,7 @@ call \func jmp .L_restore _ASM_NOKPROBE(\name) +SYM_CODE_END(\name) .endm #ifdef CONFIG_TRACE_IRQFLAGS
@@ -57,7 +56,7 @@ #if defined(CONFIG_TRACE_IRQFLAGS) \ || defined(CONFIG_DEBUG_LOCK_ALLOC) \ || defined(CONFIG_PREEMPT) -.L_restore: +SYM_CODE_START_LOCAL_NOALIGN(.L_restore) popq %r11 popq %r10 popq %r9
@@ -70,4 +69,5 @@ popq %rbp ret _ASM_NOKPROBE(.L_restore) +SYM_CODE_END(.L_restore) #endif
--
2.15.0