1 files changed, 66 insertions, 31 deletions

diff --git a/arch/x86/include/asm/dwarf2.h b/arch/x86/include/asm/dwarf2.h
index 804b6e6be929..3afc5e87cfdd 100644
--- a/arch/x86/include/asm/dwarf2.h
+++ b/arch/x86/include/asm/dwarf2.h
@@ -6,56 +6,91 @@
 #endif
 
 /*
-   Macros for dwarf2 CFI unwind table entries.
-   See "as.info" for details on these pseudo ops. Unfortunately
-   they are only supported in very new binutils, so define them
-   away for older version.
+ * Macros for dwarf2 CFI unwind table entries.
+ * See "as.info" for details on these pseudo ops. Unfortunately
+ * they are only supported in very new binutils, so define them
+ * away for older version.
  */
 
 #ifdef CONFIG_AS_CFI
 
-#define CFI_STARTPROC .cfi_startproc
-#define CFI_ENDPROC .cfi_endproc
-#define CFI_DEF_CFA .cfi_def_cfa
-#define CFI_DEF_CFA_REGISTER .cfi_def_cfa_register
-#define CFI_DEF_CFA_OFFSET .cfi_def_cfa_offset
-#define CFI_ADJUST_CFA_OFFSET .cfi_adjust_cfa_offset
-#define CFI_OFFSET .cfi_offset
-#define CFI_REL_OFFSET .cfi_rel_offset
-#define CFI_REGISTER .cfi_register
-#define CFI_RESTORE .cfi_restore
-#define CFI_REMEMBER_STATE .cfi_remember_state
-#define CFI_RESTORE_STATE .cfi_restore_state
-#define CFI_UNDEFINED .cfi_undefined
+#define CFI_STARTPROC           .cfi_startproc
+#define CFI_ENDPROC             .cfi_endproc
+#define CFI_DEF_CFA             .cfi_def_cfa
+#define CFI_DEF_CFA_REGISTER    .cfi_def_cfa_register
+#define CFI_DEF_CFA_OFFSET      .cfi_def_cfa_offset
+#define CFI_ADJUST_CFA_OFFSET   .cfi_adjust_cfa_offset
+#define CFI_OFFSET              .cfi_offset
+#define CFI_REL_OFFSET          .cfi_rel_offset
+#define CFI_REGISTER            .cfi_register
+#define CFI_RESTORE             .cfi_restore
+#define CFI_REMEMBER_STATE      .cfi_remember_state
+#define CFI_RESTORE_STATE       .cfi_restore_state
+#define CFI_UNDEFINED           .cfi_undefined
 
 #ifdef CONFIG_AS_CFI_SIGNAL_FRAME
-#define CFI_SIGNAL_FRAME .cfi_signal_frame
+#define CFI_SIGNAL_FRAME        .cfi_signal_frame
 #else
 #define CFI_SIGNAL_FRAME
 #endif
 
 #else
 
-/* Due to the structure of pre-exisiting code, don't use assembler line
-   comment character # to ignore the arguments. Instead, use a dummy macro. */
+/*
+ * Due to the structure of pre-exisiting code, don't use assembler line
+ * comment character # to ignore the arguments. Instead, use a dummy macro.
+ */
 .macro cfi_ignore a=0, b=0, c=0, d=0
 .endm
 
-#define CFI_STARTPROC   cfi_ignore
-#define CFI_ENDPROC     cfi_ignore
-#define CFI_DEF_CFA     cfi_ignore
+#define CFI_STARTPROC           cfi_ignore
+#define CFI_ENDPROC             cfi_ignore
+#define CFI_DEF_CFA             cfi_ignore
 #define CFI_DEF_CFA_REGISTER    cfi_ignore
 #define CFI_DEF_CFA_OFFSET      cfi_ignore
 #define CFI_ADJUST_CFA_OFFSET   cfi_ignore
-#define CFI_OFFSET      cfi_ignore
-#define CFI_REL_OFFSET  cfi_ignore
-#define CFI_REGISTER    cfi_ignore
-#define CFI_RESTORE     cfi_ignore
-#define CFI_REMEMBER_STATE cfi_ignore
-#define CFI_RESTORE_STATE cfi_ignore
-#define CFI_UNDEFINED cfi_ignore
-#define CFI_SIGNAL_FRAME cfi_ignore
+#define CFI_OFFSET              cfi_ignore
+#define CFI_REL_OFFSET          cfi_ignore
+#define CFI_REGISTER            cfi_ignore
+#define CFI_RESTORE             cfi_ignore
+#define CFI_REMEMBER_STATE      cfi_ignore
+#define CFI_RESTORE_STATE       cfi_ignore
+#define CFI_UNDEFINED           cfi_ignore
+#define CFI_SIGNAL_FRAME        cfi_ignore
 
 #endif
 
+/*
+ * An attempt to make CFI annotations more or less
+ * correct and shorter. It is implied that you know
+ * what you're doing if you use them.
+ */
+#ifdef __ASSEMBLY__
+#ifdef CONFIG_X86_64
+        .macro pushq_cfi reg
+        pushq \reg
+        CFI_ADJUST_CFA_OFFSET 8
+        .endm
+
+        .macro popq_cfi reg
+        popq \reg
+        CFI_ADJUST_CFA_OFFSET -8
+        .endm
+
+        .macro movq_cfi reg offset=0
+        movq %\reg, \offset(%rsp)
+        CFI_REL_OFFSET \reg, \offset
+        .endm
+
+        .macro movq_cfi_restore offset reg
+        movq \offset(%rsp), %\reg
+        CFI_RESTORE \reg
+        .endm
+#else /*!CONFIG_X86_64*/
+
+        /* 32bit defenitions are missed yet */
+
+#endif /*!CONFIG_X86_64*/
+#endif /*__ASSEMBLY__*/
+
 #endif /* _ASM_X86_DWARF2_H */