From 23c4c82171008c8b18d8627c9741cdd577631cea Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Thu, 24 Sep 2009 17:38:18 +0900 Subject: [PATCH] sh: Handle unaligned 16-bit instructions on SH-2A. This adds some sanity checking in the unaligned instruction handler to verify the instruction size, which enables basic support for 16-bit fixups on SH-2A parts. Signed-off-by: Paul Mundt --- arch/sh/kernel/traps_32.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c index 6aba9af79eaf..f9760c5c234a 100644 --- a/arch/sh/kernel/traps_32.c +++ b/arch/sh/kernel/traps_32.c @@ -452,6 +452,12 @@ int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, u_int rm; int ret, index; + /* + * XXX: We can't handle mixed 16/32-bit instructions yet + */ + if (instruction_size(instruction) != 2) + return -EINVAL; + index = (instruction>>8)&15; /* 0x0F00 */ rm = regs->regs[index]; @@ -619,9 +625,9 @@ asmlinkage void do_address_error(struct pt_regs *regs, se_user += 1; -#ifndef CONFIG_CPU_SH2A set_fs(USER_DS); - if (copy_from_user(&instruction, (u16 *)(regs->pc & ~1), 2)) { + if (copy_from_user(&instruction, (insn_size_t *)(regs->pc & ~1), + sizeof(instruction))) { set_fs(oldfs); goto uspace_segv; } @@ -633,7 +639,6 @@ asmlinkage void do_address_error(struct pt_regs *regs, "in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n", current->comm, current->pid, (void *)regs->pc, instruction); -#endif if (se_usermode & 2) goto fixup;