powerpc: Send SIGBUS on unaligned copy and paste

Calling ISA 3.0 instructions copy, copy_first, paste and paste_last
generates an alignment fault when copying or pasting unaligned
data (128 byte). We catch this and send SIGBUS to the userspace
process that caused it.

We do not emulate these because paste may contain additional metadata
when pasting to a co-processor and paste_last is the synchronisation
point for preceding copy/paste sequences.

Thanks to Michael Neuling <mikey@neuling.org> for his help.
Signed-off-by: Chris Smart <chris@distroguy.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/ppc-opcode.h

@@ -131,6 +131,8 @@
 /* sorted alphabetically */
 #define PPC_INST_BHRBE			0x7c00025c
 #define PPC_INST_CLRBHRB		0x7c00035c
+#define PPC_INST_COPY			0x7c00060c
+#define PPC_INST_COPY_FIRST		0x7c20060c
 #define PPC_INST_CP_ABORT		0x7c00068c
 #define PPC_INST_DCBA			0x7c0005ec
 #define PPC_INST_DCBA_MASK		0xfc0007fe
@@ -161,6 +163,8 @@
 #define PPC_INST_MSGSNDP		0x7c00011c
 #define PPC_INST_MTTMR			0x7c0003dc
 #define PPC_INST_NOP			0x60000000
+#define PPC_INST_PASTE			0x7c00070c
+#define PPC_INST_PASTE_LAST		0x7c20070d
 #define PPC_INST_POPCNTB		0x7c0000f4
 #define PPC_INST_POPCNTB_MASK		0xfc0007fe
 #define PPC_INST_POPCNTD		0x7c0003f4

arch/powerpc/kernel/align.c

@@ -873,6 +873,20 @@ int fix_alignment(struct pt_regs *regs)
 		return emulate_vsx(addr, reg, areg, regs, flags, nb, elsize);
 	}
 #endif
+
+	/*
+	 * ISA 3.0 (such as P9) copy, copy_first, paste and paste_last alignment
+	 * check.
+	 *
+	 * Send a SIGBUS to the process that caused the fault.
+	 *
+	 * We do not emulate these because paste may contain additional metadata
+	 * when pasting to a co-processor. Furthermore, paste_last is the
+	 * synchronisation point for preceding copy/paste sequences.
+	 */
+	if ((instruction & 0xfc0006fe) == PPC_INST_COPY)
+		return -EIO;
+
 	/* A size of 0 indicates an instruction we don't support, with
 	 * the exception of DCBZ which is handled as a special case here
 	 */