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platform_kernel-5.15
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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>
This commit is contained in:
Andre Draszik 2009-08-24 15:01:10 +09:00 committed by Paul Mundt
parent 7436cde6b2
commit 5a0ab35e43
1 changed files with 10 additions and 10 deletions
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20
arch/sh/kernel/traps_32.c
View File

@ -621,12 +621,21 @@ asmlinkage void do_address_error(struct pt_regs *regs,
se_user += 1; 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 */ /* shout about userspace fixups */
if (se_usermode & 1) if (se_usermode & 1)
printk(KERN_NOTICE "Unaligned userspace access " printk(KERN_NOTICE "Unaligned userspace access "
"in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n", "in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n",
current->comm, current->pid, (void *)regs->pc, current->comm, current->pid, (void *)regs->pc,
instruction); instruction);
#endif
if (se_usermode & 2) if (se_usermode & 2)
goto fixup; goto fixup;
@ -635,7 +644,7 @@ asmlinkage void do_address_error(struct pt_regs *regs,
goto uspace_segv; goto uspace_segv;
else { else {
/* ignore */ /* ignore */
trace_mark(kernel_arch_trap_exit, MARK_NOARGS); regs->pc += instruction_size(instruction);
return; return;
} }
@ -647,15 +656,6 @@ asmlinkage void do_address_error(struct pt_regs *regs,
} }
set_fs(USER_DS); 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, tmp = handle_unaligned_access(instruction, regs,
&user_mem_access); &user_mem_access);
set_fs(oldfs); set_fs(oldfs);