Commit 5a0ab35e authored by Andre Draszik's avatar Andre Draszik Committed by Paul Mundt

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: default avatarAndre Draszik <andre.draszik@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 7436cde6
......@@ -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 @@ asmlinkage void do_address_error(struct pt_regs *regs,
}
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);
......
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