From 5a0ab35e43a6e3c69893c0091fe6a78ea8b3e443 Mon Sep 17 00:00:00 2001 From: Andre Draszik Date: Mon, 24 Aug 2009 15:01:10 +0900 Subject: [PATCH] sh: cleanup of do_address_error() This patch fixes a few problems with the existing code in do_address_error(). a) the variable used to printk()d the offending instruction wasn't initialized correctly. This is a fix to bug 5727 b) behaviour for CONFIG_CPU_SH2A wasn't correct c) the 'ignore address error' behaviour didn't update the PC, causing an infinite loop. Signed-off-by: Andre Draszik Signed-off-by: Paul Mundt --- arch/sh/kernel/traps_32.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c index 0ad356d00ac8..c581dc31d92a 100644 --- a/arch/sh/kernel/traps_32.c +++ b/arch/sh/kernel/traps_32.c @@ -621,12 +621,21 @@ 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)) { + set_fs(oldfs); + goto uspace_segv; + } + set_fs(oldfs); + /* shout about userspace fixups */ if (se_usermode & 1) printk(KERN_NOTICE "Unaligned userspace access " "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; @@ -635,7 +644,7 @@ asmlinkage void do_address_error(struct pt_regs *regs, goto uspace_segv; else { /* ignore */ - trace_mark(kernel_arch_trap_exit, MARK_NOARGS); + regs->pc += instruction_size(instruction); return; } @@ -647,15 +656,6 @@ fixup: } set_fs(USER_DS); - if (copy_from_user(&instruction, (void __user *)(regs->pc), - sizeof(instruction))) { - /* Argh. Fault on the instruction itself. - This should never happen non-SMP - */ - set_fs(oldfs); - goto uspace_segv; - } - tmp = handle_unaligned_access(instruction, regs, &user_mem_access); set_fs(oldfs); -- 2.34.1