From 9863c28a2af90a56c088f5f6288d7f6d2c923c14 Mon Sep 17 00:00:00 2001 From: James Yang Date: Wed, 3 Jul 2013 16:26:47 -0500 Subject: [PATCH] powerpc: Emulate sync instruction variants Reserved fields of the sync instruction have been used for other instructions (e.g. lwsync). On processors that do not support variants of the sync instruction, emulate it by executing a sync to subsume the effect of the intended instruction. Signed-off-by: James Yang [scottwood@freescale.com: whitespace and subject line fix] Signed-off-by: Scott Wood --- arch/powerpc/include/asm/ppc-opcode.h | 2 ++ arch/powerpc/kernel/traps.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h index ad5fcf51b252..442edee4b6aa 100644 --- a/arch/powerpc/include/asm/ppc-opcode.h +++ b/arch/powerpc/include/asm/ppc-opcode.h @@ -143,6 +143,8 @@ #define PPC_INST_LSWX 0x7c00042a #define PPC_INST_LWARX 0x7c000028 #define PPC_INST_LWSYNC 0x7c2004ac +#define PPC_INST_SYNC 0x7c0004ac +#define PPC_INST_SYNC_MASK 0xfc0007fe #define PPC_INST_LXVD2X 0x7c000698 #define PPC_INST_MCRXR 0x7c000400 #define PPC_INST_MCRXR_MASK 0xfc0007fe diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index f0a6814007a5..36a1f95a2a36 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1018,6 +1018,13 @@ static int emulate_instruction(struct pt_regs *regs) return emulate_isel(regs, instword); } + /* Emulate sync instruction variants */ + if ((instword & PPC_INST_SYNC_MASK) == PPC_INST_SYNC) { + PPC_WARN_EMULATED(sync, regs); + asm volatile("sync"); + return 0; + } + #ifdef CONFIG_PPC64 /* Emulate the mfspr rD, DSCR. */ if ((((instword & PPC_INST_MFSPR_DSCR_USER_MASK) == -- 2.20.1