about summary refs log tree commit diff
path: root/sysdeps/x86_64/sysdep.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/x86_64/sysdep.h')
-rw-r--r--sysdeps/x86_64/sysdep.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h
index 3e7f4cbd8a..db6e36b2dd 100644
--- a/sysdeps/x86_64/sysdep.h
+++ b/sysdeps/x86_64/sysdep.h
@@ -22,10 +22,52 @@
 #include <sysdeps/x86/sysdep.h>
 #include <x86-lp_size.h>
 
+/* __CET__ is defined by GCC with Control-Flow Protection values:
+
+enum cf_protection_level
+{
+  CF_NONE = 0,
+  CF_BRANCH = 1 << 0,
+  CF_RETURN = 1 << 1,
+  CF_FULL = CF_BRANCH | CF_RETURN,
+  CF_SET = 1 << 2
+};
+*/
+
+/* Set if CF_BRANCH (IBT) is enabled.  */
+#define X86_FEATURE_1_IBT	(1U << 0)
+/* Set if CF_RETURN (SHSTK) is enabled.  */
+#define X86_FEATURE_1_SHSTK	(1U << 1)
+
+#ifdef __CET__
+# define CET_ENABLED	1
+# define SHSTK_ENABLED	(__CET__ & X86_FEATURE_1_SHSTK)
+#else
+# define CET_ENABLED	0
+# define SHSTK_ENABLED	0
+#endif
+
 #ifdef	__ASSEMBLER__
 
 /* Syntactic details of assembler.  */
 
+#ifdef _CET_ENDBR
+# define _CET_NOTRACK notrack
+#else
+# define _CET_ENDBR
+# define _CET_NOTRACK
+#endif
+
+/* Define an entry point visible from C.  */
+#define	ENTRY_P2ALIGN(name, alignment)					      \
+  .globl C_SYMBOL_NAME(name);						      \
+  .type C_SYMBOL_NAME(name),@function;					      \
+  .align ALIGNARG(alignment);						      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+  _CET_ENDBR;								      \
+  CALL_MCOUNT
+
 /* This macro is for setting proper CFI with DW_CFA_expression describing
    the register as saved relative to %rsp instead of relative to the CFA.
    Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset