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authorCornelia Huck <cornelia.huck@de.ibm.com>2012-07-23 17:20:28 +0200
committerAvi Kivity <avi@redhat.com>2012-07-26 14:04:29 +0300
commit9b7fb990e080f3a7c5dff9a829d11247e629b98f (patch)
tree666b9ba14865381bdd5504c3fbaa53f531dce76b /arch/s390/kernel/dis.c
parent23d43cf998275bc97437931c0cdee1df2c1aa3ca (diff)
s390/dis: Instruction decoding interface
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@de.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/s390/kernel/dis.c')
-rw-r--r--arch/s390/kernel/dis.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index 1f6b428e2762..c02310b8db09 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1468,6 +1468,33 @@ 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;