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s390/jump label: improve and fix sanity check

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Fix the output of the jump label sanity check and also print the
code pattern that is supposed to be written to the jump label.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2015-02-20 08:33:31 +01:00 committed by Martin Schwidefsky
parent 6f367769e3
commit 72dace969d
1 changed files with 8 additions and 4 deletions
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12
arch/s390/kernel/jump_label.c
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@ -36,16 +36,20 @@ static void jump_label_make_branch(struct jump_entry *entry, struct insn *insn)
insn->offset = (entry->target - entry->code) >> 1;
}
static void jump_label_bug(struct jump_entry *entry, struct insn *insn)
static void jump_label_bug(struct jump_entry *entry, struct insn *expected,
struct insn *new)
{
unsigned char *ipc = (unsigned char *)entry->code;
unsigned char *ipe = (unsigned char *)insn;
unsigned char *ipe = (unsigned char *)expected;
unsigned char *ipn = (unsigned char *)new;
pr_emerg("Jump label code mismatch at %pS [%p]\n", ipc, ipc);
pr_emerg("Found: %02x %02x %02x %02x %02x %02x\n",
ipc[0], ipc[1], ipc[2], ipc[3], ipc[4], ipc[5]);
pr_emerg("Expected: %02x %02x %02x %02x %02x %02x\n",
ipe[0], ipe[1], ipe[2], ipe[3], ipe[4], ipe[5]);
pr_emerg("New: %02x %02x %02x %02x %02x %02x\n",
ipn[0], ipn[1], ipn[2], ipn[3], ipn[4], ipn[5]);
panic("Corrupted kernel text");
}
@ -69,10 +73,10 @@ static void __jump_label_transform(struct jump_entry *entry,
}
if (init) {
if (memcmp((void *)entry->code, &orignop, sizeof(orignop)))
jump_label_bug(entry, &old);
jump_label_bug(entry, &orignop, &new);
} else {
if (memcmp((void *)entry->code, &old, sizeof(old)))
jump_label_bug(entry, &old);
jump_label_bug(entry, &old, &new);
}
probe_kernel_write((void *)entry->code, &new, sizeof(new));
}