zfs/powerpc64: Fix big-endian powerpc64 asm

The powerpc asm from openzfs assumes that big-endian is always ELFv1 and
ELFv2 is always little-endian, while FreeBSD uses ELFv2 everywhere.  Add
the necessary bits to the checksum asm to work on big-endian ELFv2.

This was also submitted upstream as PR#14779.

Tested by:	dbaio

sys/contrib/openzfs/lib/libspl/include/sys/simd.h

@@ -551,7 +551,7 @@ zfs_sha512_available(void)
 
 #elif defined(__powerpc__)
 
-#define	kfpu_allowed()		1
+#define	kfpu_allowed()		0
 #define	kfpu_initialize(tsk)	do {} while (0)
 #define	kfpu_begin()		do {} while (0)
 #define	kfpu_end()		do {} while (0)

sys/contrib/openzfs/module/icp/asm-ppc64/sha2/sha256-p8.S

@@ -21,6 +21,7 @@
 
 #if (defined(__PPC64__) && defined(__BIG_ENDIAN__))
 
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .text
 
 .globl	zfs_sha256_power8
@@ -33,6 +34,16 @@ zfs_sha256_power8:
 .previous
 .align	6
 .zfs_sha256_power8:
+#else
+.abiversion	2
+.text
+
+.globl	zfs_sha256_power8
+.type	zfs_sha256_power8,@function
+.align	6
+zfs_sha256_power8:
+.localentry	zfs_sha256_power8,0
+#endif
 	stdu	1,-384(1)
 	mflr	8
 	li	10,207
@@ -677,8 +688,12 @@ zfs_sha256_power8:
 .long	0
 .byte	0,12,4,1,0x80,6,3,0
 .long	0
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .size	.zfs_sha256_power8,.-.zfs_sha256_power8
 .size	zfs_sha256_power8,.-.zfs_sha256_power8
+#else
+.size	zfs_sha256_power8,.-zfs_sha256_power8
+#endif
 .align	6
 .LPICmeup:
 	mflr	0

sys/contrib/openzfs/module/icp/asm-ppc64/sha2/sha256-ppc.S

@@ -21,6 +21,7 @@
 
 #if (defined(__PPC64__) && defined(__BIG_ENDIAN__))
 
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .text
 
 .globl	zfs_sha256_ppc
@@ -33,6 +34,16 @@ zfs_sha256_ppc:
 .previous
 .align	6
 .zfs_sha256_ppc:
+#else
+.abiversion	2
+.text
+
+.globl	zfs_sha256_ppc
+.type	zfs_sha256_ppc,@function
+.align	6
+zfs_sha256_ppc:
+.localentry	zfs_sha256_ppc,0
+#endif
 	stdu	1,-320(1)
 	mflr	0
 	sldi	5,5,6
@@ -1312,8 +1323,12 @@ zfs_sha256_ppc:
 	blr	
 .long	0
 .byte	0,12,0x14,0,0,0,0,0
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .size	.zfs_sha256_ppc,.-.zfs_sha256_ppc
 .size	zfs_sha256_ppc,.-.zfs_sha256_ppc
+#else
+.size	zfs_sha256_ppc,.-zfs_sha256_ppc
+#endif
 .align	6
 .LPICmeup:
 	mflr	0

sys/contrib/openzfs/module/icp/asm-ppc64/sha2/sha512-p8.S

@@ -21,6 +21,7 @@
 
 #if (defined(__PPC64__) && defined(__BIG_ENDIAN__))
 
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .text
 
 .globl	zfs_sha512_power8
@@ -33,6 +34,17 @@ zfs_sha512_power8:
 .previous
 .align	6
 .zfs_sha512_power8:
+#else
+.abiversion	2
+.text
+
+.globl	zfs_sha512_power8
+.type	zfs_sha512_power8,@function
+.align	6
+zfs_sha512_power8:
+.localentry	zfs_sha512_power8,0
+#endif
+
 	stdu	1,-384(1)
 	mflr	8
 	li	10,207
@@ -679,8 +691,12 @@ zfs_sha512_power8:
 .long	0
 .byte	0,12,4,1,0x80,6,3,0
 .long	0
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .size	.zfs_sha512_power8,.-.zfs_sha512_power8
 .size	zfs_sha512_power8,.-.zfs_sha512_power8
+#else
+.size	zfs_sha512_power8,.-zfs_sha512_power8
+#endif
 .align	6
 .LPICmeup:
 	mflr	0

sys/contrib/openzfs/module/icp/asm-ppc64/sha2/sha512-ppc.S

@@ -21,6 +21,7 @@
 
 #if (defined(__PPC64__) && defined(__BIG_ENDIAN__))
 
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .text
 
 .globl	zfs_sha512_ppc
@@ -33,6 +34,16 @@ zfs_sha512_ppc:
 .previous
 .align	6
 .zfs_sha512_ppc:
+#else
+.abiversion	2
+.text
+
+.globl	zfs_sha512_ppc
+.type	zfs_sha512_ppc,@function
+.align	6
+zfs_sha512_ppc:
+.localentry	zfs_sha512_ppc,0
+#endif
 	stdu	1,-384(1)
 	mflr	0
 	sldi	5,5,7
@@ -1350,8 +1361,12 @@ zfs_sha512_ppc:
 	blr	
 .long	0
 .byte	0,12,0x14,0,0,0,0,0
+#if (!defined(_CALL_ELF) || _CALL_ELF == 1)
 .size	.zfs_sha512_ppc,.-.zfs_sha512_ppc
 .size	zfs_sha512_ppc,.-.zfs_sha512_ppc
+#else
+.size	zfs_sha512_ppc,.-zfs_sha512_ppc
+#endif
 .align	6
 .LPICmeup:
 	mflr	0