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| author | Andre Draszik <andre.draszik@st.com> | 2009-08-24 08:01:10 +0200 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-24 08:01:10 +0200 |
| commit | 5a0ab35e43a6e3c69893c0091fe6a78ea8b3e443 (patch) | |
| tree | fe45c2734484f8889e824a5045170bd4b64db975 /arch/sh/kernel/traps_32.c | |
| parent | sh: Allow user control over misaligned fixup handling (diff) | |
| download | linux-5a0ab35e43a6e3c69893c0091fe6a78ea8b3e443.tar.xz linux-5a0ab35e43a6e3c69893c0091fe6a78ea8b3e443.zip | |
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 <andre.draszik@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/traps_32.c')
| -rw-r--r-- | arch/sh/kernel/traps_32.c | 20 |
1 files 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); |