Provide a new function, insn_to_mnemonic, by which e.g. kvm can obtain
a human-readable decoding of an instruction's opcode.
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Reviewed-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
---
arch/s390/include/asm/processor.h | 1 +
arch/s390/kernel/dis.c | 27 +++++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 20d0585..dc99b6e 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -140,6 +140,7 @@ extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *t);
extern void show_code(struct pt_regs *regs);
+extern int insn_to_mnemonic(unsigned char *instruction, char buf[8]);
unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *) \
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index 3221c6f..8e7088e 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1469,6 +1469,33 @@ static struct insn *find_insn(unsigned char *code)
return NULL;
}
+/**
+ * insn_to_mnemonic - decode an s390 instruction
+ * @instruction: instruction to decode
+ * @buf: buffer to fill with mnemonic
+ *
+ * Decode the instruction at @instruction and store the corresponding
+ * mnemonic into @buf.
+ * @buf is left unchanged if the instruction could not be decoded.
+ * Returns:
+ * %0 on success, %-ENOENT if the instruction was not found.
+ */
+int insn_to_mnemonic(unsigned char *instruction, char buf[8])
+{
+ struct insn *insn;
+
+ insn = find_insn(instruction);
+ if (!insn)
+ return -ENOENT;
+ if (insn->name[0] == '\0')
+ snprintf(buf, sizeof(buf), "%s",
+ long_insn_name[(int) insn->name[1]]);
+ else
+ snprintf(buf, sizeof(buf), "%.5s", insn->name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(insn_to_mnemonic);
+
static int print_insn(char *buffer, unsigned char *code, unsigned long addr)
{
struct insn *insn;
--
1.7.11.2
--
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