Fix RHEL 8

Signed-off-by: Attila Fülöp <attila@fueloep.org>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>

Author: AttilaFueloep

config/kernel-objtool.m4

@@ -11,10 +11,12 @@ AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL_HEADER], [
 		#include <linux/objtool.h>
 	],[
 	],[
+		objtool_header=$LINUX/include/linux/objtool.h
 		AC_DEFINE(HAVE_KERNEL_OBJTOOL_HEADER, 1,
 		    [kernel has linux/objtool.h])
 		AC_MSG_RESULT(linux/objtool.h)
 	],[
+		objtool_header=$LINUX/include/linux/frame.h
 		AC_MSG_RESULT(linux/frame.h)
 	])
 ])
@@ -62,6 +64,17 @@ AC_DEFUN([ZFS_AC_KERNEL_OBJTOOL], [
 			AC_MSG_RESULT(yes)
 			AC_DEFINE(HAVE_STACK_FRAME_NON_STANDARD, 1,
 			   [STACK_FRAME_NON_STANDARD is defined])
+
+			dnl # Needed for kernels missing the asm macro.
+			AC_MSG_CHECKING(
+			    [whether STACK_FRAME_NON_STANDARD asm macro is defined])
+			AS_IF([$GREP -s -q ".macro STACK_FRAME_NON_STANDARD" $objtool_header],[
+				AC_MSG_RESULT(yes)
+				AC_DEFINE(HAVE_STACK_FRAME_NON_STANDARD_ASM, 1,
+				   [STACK_FRAME_NON_STANDARD asm macro is defined])
+			],[
+				AC_MSG_RESULT(no)
+			])
 		],[
 			AC_MSG_RESULT(no)
 		])

include/sys/frame.h

@@ -31,6 +31,10 @@ extern "C" {
 #else
 #include <linux/frame.h>
 #endif
+#if ! defined(HAVE_STACK_FRAME_NON_STANDARD_ASM)
+.macro STACK_FRAME_NON_STANDARD func:req
+.endm
+#endif
 #else
 #define	STACK_FRAME_NON_STANDARD(func)
 #if defined(_ASM)

module/icp/asm-x86_64/modes/aesni-gcm-x86_64.S

@@ -1262,6 +1262,18 @@ SECTION_STATIC
 .byte	65,69,83,45,78,73,32,71,67,77,32,109,111,100,117,108,101,32,102,111,114,32,120,56,54,95,54,52,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
 .balign	64
 
+/* Workaround for missing asm macro in RHEL 8. */
+#if defined(__linux__) && defined(HAVE_STACK_FRAME_NON_STANDARD) && \
+    ! defined(HAVE_STACK_FRAME_NON_STANDARD_ASM)
+.section .discard.func_stack_frame_non_standard, "aw"
+#ifdef HAVE_MOVBE
+	.long _aesni_ctr32_ghash_6x  - .
+#endif
+	.long _aesni_ctr32_ghash_no_movbe_6x - .
+	.long aesni_gcm_decrypt - .
+	.long aesni_gcm_encrypt - .
+#endif
+
 /* Mark the stack non-executable. */
 #if defined(__linux__) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits

module/icp/asm-x86_64/sha2/sha256-x86_64.S

@@ -5105,6 +5105,17 @@ ENTRY_ALIGN(zfs_sha256_transform_avx2, 64)
 SET_SIZE(zfs_sha256_transform_avx2)
 STACK_FRAME_NON_STANDARD zfs_sha256_transform_avx2
 
+/* Workaround for missing asm macro in RHEL 8. */
+#if defined(__linux__) && defined(HAVE_STACK_FRAME_NON_STANDARD) && \
+    ! defined(HAVE_STACK_FRAME_NON_STANDARD_ASM)
+.section .discard.func_stack_frame_non_standard, "aw"
+	.long zfs_sha256_transform_x64 - .
+	.long zfs_sha256_transform_shani - .
+	.long zfs_sha256_transform_ssse3 - .
+	.long zfs_sha256_transform_avx - .
+	.long zfs_sha256_transform_avx2 - .
+#endif
+
 #if defined(__ELF__)
 	.section .note.GNU-stack,"",%progbits
 #endif

module/icp/asm-x86_64/sha2/sha512-x86_64.S

@@ -4010,6 +4010,15 @@ ENTRY_ALIGN(zfs_sha512_transform_avx2, 64)
 SET_SIZE(zfs_sha512_transform_avx2)
 STACK_FRAME_NON_STANDARD zfs_sha512_transform_avx2
 
+/* Workaround for missing asm macro in RHEL 8. */
+#if defined(__linux__) && defined(HAVE_STACK_FRAME_NON_STANDARD) && \
+    ! defined(HAVE_STACK_FRAME_NON_STANDARD_ASM)
+.section .discard.func_stack_frame_non_standard, "aw"
+	.long zfs_sha512_transform_x64 - .
+	.long zfs_sha512_transform_avx - .
+	.long zfs_sha512_transform_avx2 - .
+#endif
+
 #if defined(__ELF__)
 	.section .note.GNU-stack,"",%progbits
 #endif