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, 123 deletions

diff --git a/sysdeps/unix/sysv/linux/i386/makecontext.S b/sysdeps/unix/sysv/linux/i386/makecontext.S
index 814127d130..7ee56300fa 100644
--- a/sysdeps/unix/sysv/linux/i386/makecontext.S
+++ b/sysdeps/unix/sysv/linux/i386/makecontext.S
@@ -17,7 +17,6 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
-#include <asm/prctl.h>
 
 #include "ucontext_i.h"
 
@@ -68,127 +67,6 @@ ENTRY(__makecontext)
 	jnz	1b
 2:
 
-#if SHSTK_ENABLED
-	/* Check if Shadow Stack is enabled.  */
-	testl	$X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET
-	jz	L(skip_ssp)
-
-	/* Reload the pointer to ucontext.  */
-	movl	4(%esp), %eax
-
-	/* Shadow stack is enabled.  We need to allocate a new shadow
-	   stack.  */
-	subl	oSS_SP(%eax), %edx
-	shrl	$STACK_SIZE_TO_SHADOW_STACK_SIZE_SHIFT, %edx
-
-	/* Align shadow stack size to 8 bytes.  */
-	addl	$7, %edx
-	andl	$-8, %edx
-
-	/* Store shadow stack size in __ssp[2].  */
-	movl	%edx, (oSSP + 8)(%eax)
-
-	/* Save ESI in the second scratch register slot.  */
-	movl	%esi, oSCRATCH2(%eax)
-	/* Save EDI in the third scratch register slot.  */
-	movl	%edi, oSCRATCH3(%eax)
-
-	/* Save the pointer to ucontext.  */
-	movl	%eax, %edi
-
-	/* Get the original shadow stack pointer.  */
-	rdsspd	%esi
-
-	/* Align the saved original shadow stack pointer to the next
-	   8 byte aligned boundary.  */
-	andl	$-8, %esi
-
-	/* Load the top of the new stack into EDX.  */
-	movl	oESP(%eax), %edx
-
-	/* We need to terminate the FDE here because the unwinder looks
-	   at ra-1 for unwind information.  */
-	cfi_endproc
-
-	/* Swap the original stack pointer with the top of the new
-	   stack.  */
-	xchgl	%esp, %edx
-
-	/* Add 4 bytes since CALL will push the 4-byte return address
-	   onto stack.  */
-	addl	$4, %esp
-
-	/* Allocate the new shadow stack.  Save EBX in the first scratch
-	   register slot.  */
-	movl	%ebx, oSCRATCH1(%eax)
-
-	/* CET syscall takes 64-bit sizes.  */
-	subl	$16, %esp
-	movl	(oSSP + 8)(%eax), %ecx
-	movl	%ecx, (%esp)
-	movl	$0, 4(%esp)
-	movl	%ecx, 8(%esp)
-	movl	$0, 12(%esp)
-	movl	%esp, %ecx
-
-	movl	$ARCH_CET_ALLOC_SHSTK, %ebx
-	movl	$__NR_arch_prctl, %eax
-	ENTER_KERNEL
-	testl	%eax, %eax
-	jne	L(hlt)		/* This should never happen.  */
-
-	/* Copy the base address of the new shadow stack to __ssp[1].  */
-	movl	(%esp), %eax
-	movl	%eax, (oSSP + 4)(%edi)
-
-	addl	$16, %esp
-
-	/* Restore EBX from the first scratch register slot.  */
-	movl	oSCRATCH1(%edi), %ebx
-
-	/* Get the size of the new shadow stack.  */
-	movl	(oSSP + 8)(%edi), %ecx
-
-	/* Use the restore stoken to restore the new shadow stack.  */
-	rstorssp -8(%eax, %ecx)
-
-	/* Save the restore token at the next 8 byte aligned boundary
-	   on the original shadow stack.  */
-	saveprevssp
-
-	/* Push the address of "jmp exitcode" onto the new stack as
-	   well as the new shadow stack.  */
-	call	1f
-	jmp	L(exitcode)
-1:
-
-	/* Get the new shadow stack pointer.  */
-	rdsspd	%eax
-
-	/* Use the restore stoken to restore the original shadow stack.  */
-	rstorssp -8(%esi)
-
-	/* Save the restore token on the new shadow stack.  */
-	saveprevssp
-
-	/* Store the new shadow stack pointer in __ssp[0].  */
-	movl	%eax, oSSP(%edi)
-
-	/* Restore the original stack.  */
-	mov	%edx, %esp
-
-	cfi_startproc
-
-	/* Restore ESI from the second scratch register slot.  */
-	movl	oSCRATCH2(%edi), %esi
-	/* Restore EDI from the third scratch register slot.  */
-	movl	oSCRATCH3(%edi), %edi
-
-	ret
-
-L(skip_ssp):
-#endif
-
 	/* If the function we call returns we must continue with the
 	   context which is given in the uc_link element.  To do this
 	   set the return address for the function the user provides
@@ -244,7 +122,6 @@ L(call_exit):
 	call	HIDDEN_JUMPTARGET(exit)
 	/* The 'exit' call should never return.  In case it does cause
 	   the process to terminate.  */
-L(hlt):
 	hlt
 	cfi_startproc
 END(__makecontext)