Index: head/sys/arm/include/elf.h
===================================================================
--- head/sys/arm/include/elf.h
+++ head/sys/arm/include/elf.h
@@ -86,8 +86,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 #define	R_ARM_COUNT	33	/* Count of defined relocation types. */
 
Index: head/sys/arm64/include/elf.h
===================================================================
--- head/sys/arm64/include/elf.h
+++ head/sys/arm64/include/elf.h
@@ -92,8 +92,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /* Define "machine" characteristics */
 #define	ELF_TARG_CLASS	ELFCLASS64
Index: head/sys/kern/imgact_elf.c
===================================================================
--- head/sys/kern/imgact_elf.c
+++ head/sys/kern/imgact_elf.c
@@ -1133,6 +1133,8 @@
 	    imgp->sysent->sv_stackprot);
 	if (imgp->sysent->sv_hwcap != NULL)
 		AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
+	if (imgp->sysent->sv_hwcap2 != NULL)
+		AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
 	AUXARGS_ENTRY(pos, AT_NULL, 0);
 
 	free(imgp->auxargs, M_TEMP);
Index: head/sys/mips/include/elf.h
===================================================================
--- head/sys/mips/include/elf.h
+++ head/sys/mips/include/elf.h
@@ -146,8 +146,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 #define	ET_DYN_LOAD_ADDR 0x0120000
 
Index: head/sys/powerpc/include/elf.h
===================================================================
--- head/sys/powerpc/include/elf.h
+++ head/sys/powerpc/include/elf.h
@@ -109,8 +109,9 @@
 #define	AT_TIMEKEEP	22	/* Pointer to timehands. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /*
  * Relocation types.
Index: head/sys/riscv/include/elf.h
===================================================================
--- head/sys/riscv/include/elf.h
+++ head/sys/riscv/include/elf.h
@@ -92,8 +92,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /* Define "machine" characteristics */
 #define	ELF_TARG_CLASS	ELFCLASS64
Index: head/sys/sparc64/include/elf.h
===================================================================
--- head/sys/sparc64/include/elf.h
+++ head/sys/sparc64/include/elf.h
@@ -94,8 +94,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /* Define "machine" characteristics */
 #if __ELF_WORD_SIZE == 32
Index: head/sys/sys/sysent.h
===================================================================
--- head/sys/sys/sysent.h
+++ head/sys/sys/sysent.h
@@ -130,6 +130,7 @@
 	void		(*sv_thread_detach)(struct thread *);
 	int		(*sv_trap)(struct thread *);
 	u_long		*sv_hwcap;	/* Value passed in AT_HWCAP. */
+	u_long		*sv_hwcap2;	/* Value passed in AT_HWCAP2. */
 };
 
 #define	SV_ILP32	0x000100	/* 32-bit executable. */
Index: head/sys/x86/include/elf.h
===================================================================
--- head/sys/x86/include/elf.h
+++ head/sys/x86/include/elf.h
@@ -102,8 +102,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /*
  * Relocation types.
@@ -189,8 +190,9 @@
 #define	AT_STACKPROT	23	/* Initial stack protection. */
 #define	AT_EHDRFLAGS	24	/* e_flags field from elf hdr */
 #define	AT_HWCAP	25	/* CPU feature flags. */
+#define	AT_HWCAP2	26	/* CPU feature flags 2. */
 
-#define	AT_COUNT	26	/* Count of defined aux entry types. */
+#define	AT_COUNT	27	/* Count of defined aux entry types. */
 
 /*
  * Relocation types.