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author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2012-07-23 17:20:28 +0200 |
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committer | Avi Kivity <avi@redhat.com> | 2012-07-26 14:04:29 +0300 |
commit | 9b7fb990e080f3a7c5dff9a829d11247e629b98f (patch) | |
tree | 666b9ba14865381bdd5504c3fbaa53f531dce76b /arch/s390/kernel | |
parent | 23d43cf998275bc97437931c0cdee1df2c1aa3ca (diff) | |
download | op-kernel-dev-9b7fb990e080f3a7c5dff9a829d11247e629b98f.zip op-kernel-dev-9b7fb990e080f3a7c5dff9a829d11247e629b98f.tar.gz |
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')
-rw-r--r-- | arch/s390/kernel/dis.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c index 1f6b428..c02310b 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; |