#include <linux/kdebug.h>
#include <linux/kexec.h>
#include <linux/limits.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/sysfs.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/fpu.h>
#define TRAP_ILLEGAL_SLOT_INST 13
#endif
+static unsigned long se_user;
+static unsigned long se_sys;
+static unsigned long se_half;
+static unsigned long se_word;
+static unsigned long se_dword;
+static unsigned long se_multi;
+/* bitfield: 1: warn 2: fixup 4: signal -> combinations 2|4 && 1|2|4 are not
+ valid! */
+static int se_usermode = 3;
+/* 0: no warning 1: print a warning message, disabled by default */
+static int se_kernmode_warn;
+
+#ifdef CONFIG_PROC_FS
+static const char *se_usermode_action[] = {
+ "ignored",
+ "warn",
+ "fixup",
+ "fixup+warn",
+ "signal",
+ "signal+warn"
+};
+
+static int alignment_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "User:\t\t%lu\n", se_user);
+ seq_printf(m, "System:\t\t%lu\n", se_sys);
+ seq_printf(m, "Half:\t\t%lu\n", se_half);
+ seq_printf(m, "Word:\t\t%lu\n", se_word);
+ seq_printf(m, "DWord:\t\t%lu\n", se_dword);
+ seq_printf(m, "Multi:\t\t%lu\n", se_multi);
+ seq_printf(m, "User faults:\t%i (%s)\n", se_usermode,
+ se_usermode_action[se_usermode]);
+ seq_printf(m, "Kernel faults:\t%i (fixup%s)\n", se_kernmode_warn,
+ se_kernmode_warn ? "+warn" : "");
+ return 0;
+}
+
+static int alignment_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, alignment_proc_show, NULL);
+}
+
+static ssize_t alignment_proc_write(struct file *file,
+ const char __user *buffer, size_t count, loff_t *pos)
+{
+ int *data = PDE(file->f_path.dentry->d_inode)->data;
+ char mode;
+
+ if (count > 0) {
+ if (get_user(mode, buffer))
+ return -EFAULT;
+ if (mode >= '0' && mode <= '5')
+ *data = mode - '0';
+ }
+ return count;
+}
+
+static const struct file_operations alignment_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = alignment_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = alignment_proc_write,
+};
+#endif
+
static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
{
unsigned long p;
oops_enter();
- console_verbose();
spin_lock_irq(&die_lock);
+ console_verbose();
bust_spinlocks(1);
printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
-
+ sysfs_printk_last_file();
print_modules();
show_regs(regs);
bust_spinlocks(0);
add_taint(TAINT_DIE);
spin_unlock_irq(&die_lock);
+ oops_exit();
if (kexec_should_crash(current))
crash_kexec(regs);
if (panic_on_oops)
panic("Fatal exception");
- oops_exit();
do_exit(SIGSEGV);
}
count = 1<<(instruction&3);
+ switch (count) {
+ case 1: se_half += 1; break;
+ case 2: se_word += 1; break;
+ case 4: se_dword += 1; break;
+ case 8: se_multi += 1; break; /* ??? */
+ }
+
ret = -EFAULT;
switch (instruction>>12) {
case 0: /* mov.[bwl] to/from memory via r0+rn */
#define SH_PC_12BIT_OFFSET(instr) ((((signed short)(instr<<4))>>3) + 4)
int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
- struct mem_access *ma)
+ struct mem_access *ma, int expected)
{
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];
/* shout about fixups */
- if (printk_ratelimit())
+ if (!expected && printk_ratelimit())
printk(KERN_NOTICE "Fixing up unaligned %s access "
"in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n",
user_mode(regs) ? "userspace" : "kernel",
local_irq_enable();
- /* bad PC is not something we can fix */
- if (regs->pc & 1) {
- si_code = BUS_ADRALN;
- goto uspace_segv;
- }
+ se_user += 1;
set_fs(USER_DS);
- if (copy_from_user(&instruction, (void __user *)(regs->pc),
+ if (copy_from_user(&instruction, (insn_size_t *)(regs->pc & ~1),
sizeof(instruction))) {
- /* Argh. Fault on the instruction itself.
- This should never happen non-SMP
- */
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);
+
+ if (se_usermode & 2)
+ goto fixup;
+
+ if (se_usermode & 4)
+ goto uspace_segv;
+ else {
+ /* ignore */
+ regs->pc += instruction_size(instruction);
+ return;
+ }
+
+fixup:
+ /* bad PC is not something we can fix */
+ if (regs->pc & 1) {
+ si_code = BUS_ADRALN;
+ goto uspace_segv;
+ }
+ set_fs(USER_DS);
tmp = handle_unaligned_access(instruction, regs,
- &user_mem_access);
+ &user_mem_access, 0);
set_fs(oldfs);
if (tmp==0)
info.si_addr = (void __user *)address;
force_sig_info(SIGBUS, &info, current);
} else {
+ se_sys += 1;
+
if (regs->pc & 1)
die("unaligned program counter", regs, error_code);
die("insn faulting in do_address_error", regs, 0);
}
- handle_unaligned_access(instruction, regs, &user_mem_access);
+ if (se_kernmode_warn)
+ printk(KERN_NOTICE "Unaligned kernel access "
+ "on behalf of \"%s\" pid=%d pc=0x%p ins=0x%04hx\n",
+ current->comm, current->pid, (void *)regs->pc,
+ instruction);
+
+ handle_unaligned_access(instruction, regs,
+ &user_mem_access, 0);
set_fs(oldfs);
}
}
set_exception_table_evt(0x800, do_reserved_inst);
set_exception_table_evt(0x820, do_illegal_slot_inst);
#elif defined(CONFIG_SH_FPU)
-#ifdef CONFIG_CPU_SUBTYPE_SHX3
- set_exception_table_evt(0xd80, fpu_state_restore_trap_handler);
- set_exception_table_evt(0xda0, fpu_state_restore_trap_handler);
-#else
set_exception_table_evt(0x800, fpu_state_restore_trap_handler);
set_exception_table_evt(0x820, fpu_state_restore_trap_handler);
#endif
-#endif
#ifdef CONFIG_CPU_SH2
set_exception_table_vec(TRAP_ADDRESS_ERROR, address_error_trap_handler);
show_stack(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * This needs to be done after sysctl_init, otherwise sys/ will be
+ * overwritten. Actually, this shouldn't be in sys/ at all since
+ * it isn't a sysctl, and it doesn't contain sysctl information.
+ * We now locate it in /proc/cpu/alignment instead.
+ */
+static int __init alignment_init(void)
+{
+ struct proc_dir_entry *dir, *res;
+
+ dir = proc_mkdir("cpu", NULL);
+ if (!dir)
+ return -ENOMEM;
+
+ res = proc_create_data("alignment", S_IWUSR | S_IRUGO, dir,
+ &alignment_proc_fops, &se_usermode);
+ if (!res)
+ return -ENOMEM;
+
+ res = proc_create_data("kernel_alignment", S_IWUSR | S_IRUGO, dir,
+ &alignment_proc_fops, &se_kernmode_warn);
+ if (!res)
+ return -ENOMEM;
+
+ return 0;
+}
+
+fs_initcall(alignment_init);
+#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff