diff -up ./arch/x86/Kconfig.cpu.ssp ./arch/x86/Kconfig.cpu
--- ./arch/x86/Kconfig.cpu.ssp	2026-05-29 18:37:41.253961024 +0900
+++ ./arch/x86/Kconfig.cpu	2026-05-29 18:50:49.969150158 +0900
@@ -383,6 +383,18 @@ config GEODE_NOPL
 
 	  If you are not sure, say N.
 
+config IGNORE_SSP_OPCODE
+	bool "Skip unrecognized SSP (Shadow Stack Pointer) opcodes"
+	depends on X86_32 && CPU_EMU486
+	help
+	  Skips endbr32, incsspd, rdsspd opcode on unsupported CPUs.
+	  glibc unconditionally uses these opcode in __longjmp.S,
+	  which causes illegal opcode exceptions on CPUs not capable of
+	  CET_IBT feature.
+	  Does not affect CPUs which do have CET_IBT feature.
+
+	  If you are not sure, say N.
+
 config CPU_EMU486_DEBUG
 	bool "Emulation debug"
 	depends on X86_32 && CPU_EMU486
diff -up ./arch/x86/configs/i386_defconfig.ssp ./arch/x86/configs/i386_defconfig
--- ./arch/x86/configs/i386_defconfig.ssp	2026-05-29 18:37:41.305961133 +0900
+++ ./arch/x86/configs/i386_defconfig	2026-05-29 18:50:49.970150160 +0900
@@ -33,6 +33,7 @@ CONFIG_SMP=y
 # CONFIG_CPU_EMU686 is not set
 # CONFIG_CPU_EMU486_DEBUG is not set
 # CONFIG_GEODE_NOPL is not set
+# CONFIG_IGNORE_SSP_OPCODE is not set
 CONFIG_HYPERVISOR_GUEST=y
 CONFIG_PARAVIRT=y
 CONFIG_NR_CPUS=8
diff -up ./arch/x86/kernel/traps.c.ssp ./arch/x86/kernel/traps.c
--- ./arch/x86/kernel/traps.c.ssp	2026-05-29 18:37:41.380961292 +0900
+++ ./arch/x86/kernel/traps.c	2026-05-29 18:50:49.971150161 +0900
@@ -640,6 +640,30 @@ static void handle_invalid_op(struct pt_
 	u32 *src, *dst;
 	u8 *eip = (u8 *)regs->ip;
 
+#ifdef CONFIG_IGNORE_SSP_OPCODE
+	{
+	u32 op32;
+	get_user(op32, (u32 *)eip);
+	/* endbr32: F3 0F 1E FB */
+	if (op32 == swab32(0xf30f1efb)) {
+		regs->ip = (typeof(regs->ip))(eip + 4);
+		return;
+	}
+	/* rdsspd r32: F3 0F 1E /1 (mod=11) */
+	if ((op32 & swab32(0xffffff00 | 0b11111000)) ==
+                    swab32(0xf30f1e00 | 0b11001000)) {
+		regs->ip = (typeof(regs->ip))(eip + 4);
+		return;
+	}
+	/* incsspd r32: F3 0F AE /5 */
+	if ((op32 & swab32(0xffffff00 | 0b11111000)) ==
+	            swab32(0xf30fae00 | 0b11101000)) {
+		regs->ip = (typeof(regs->ip))(eip + 4);
+		return;
+	}
+	}/*op32*/
+#endif
+
 #ifdef CONFIG_GEODE_NOPL
 /*do_nopl_emu*/
 	{