i386: Remove CET support

CET is only support for x86_64, this patch reverts:

  - faaee1f07ed x86: Support shadow stack pointer in setjmp/longjmp.
  - be9ccd27c09 i386: Add _CET_ENDBR to indirect jump targets in
    add_n.S/sub_n.S
  - c02695d7764 x86/CET: Update vfork to prevent child return
  - 5d844e1b725 i386: Enable CET support in ucontext functions
  - 124bcde683 x86: Add _CET_ENDBR to functions in crti.S
  - 562837c002 x86: Add _CET_ENDBR to functions in dl-tlsdesc.S
  - f753fa7dea x86: Support IBT and SHSTK in Intel CET [BZ #21598]
  - 825b58f3fb i386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__
  - 7e119cd582 i386: Use _CET_NOTRACK in i686/memcmp.S
  - 177824e232 i386: Use _CET_NOTRACK in memcmp-sse4.S
  - 0a899af097 i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S
  - 7fb613361c i386: Use _CET_NOTRACK in memcpy-ssse3.S
  - 77a8ae0948 i386: Use _CET_NOTRACK in memset-sse2-rep.S
  - 00e7b76a8f i386: Use _CET_NOTRACK in memset-sse2.S
  - 90d15dc577 i386: Use _CET_NOTRACK in strcat-sse2.S
  - f1574581c7 i386: Use _CET_NOTRACK in strcpy-sse2.S
  - 4031d7484a i386/sub_n.S: Add a missing _CET_ENDBR to indirect jump
  - target
  -
Checked on i686-linux-gnu.

1 files changed, 0 insertions, 44 deletions

diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
index 5a14ca5110..85d0a8c943 100644
--- a/sysdeps/x86/sysdep.h
+++ b/sysdeps/x86/sysdep.h
@@ -21,33 +21,6 @@
 
 #include <sysdeps/generic/sysdep.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 IBT_ENABLED	(__CET__ & X86_FEATURE_1_IBT)
-# define SHSTK_ENABLED	(__CET__ & X86_FEATURE_1_SHSTK)
-#else
-# define CET_ENABLED	0
-# define IBT_ENABLED	0
-# define SHSTK_ENABLED	0
-#endif
-
 /* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need
    space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be
    aligned to 16 bytes for fxsave and 64 bytes for xsave.  */
@@ -66,27 +39,10 @@ enum cf_protection_level
 
 /* Syntactic details of assembler.  */
 
-#ifdef _CET_ENDBR
-# define _CET_NOTRACK notrack
-#else
-# define _CET_ENDBR
-# define _CET_NOTRACK
-#endif
-
 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
 #define ALIGNARG(log2) 1<<log2
 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
 
-/* 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
-
 /* Common entry 16 byte aligns.  */
 #define ENTRY(name) ENTRY_P2ALIGN (name, 4)