From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cornelia Huck Subject: [PATCH 1/3] s390/dis: Instruction decoding interface. Date: Mon, 23 Jul 2012 17:20:28 +0200 Message-ID: <1343056830-45290-2-git-send-email-cornelia.huck@de.ibm.com> References: <1343056830-45290-1-git-send-email-cornelia.huck@de.ibm.com> Cc: Christian Borntraeger , Carsten Otte , Alexander Graf , Heiko Carstens , Martin Schwidefsky , KVM , linux-s390 To: Avi Kivity , Marcelo Tosatti Return-path: Received: from e06smtp14.uk.ibm.com ([195.75.94.110]:51093 "EHLO e06smtp14.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754166Ab2GWPVC (ORCPT ); Mon, 23 Jul 2012 11:21:02 -0400 Received: from /spool/local by e06smtp14.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 23 Jul 2012 16:21:01 +0100 In-Reply-To: <1343056830-45290-1-git-send-email-cornelia.huck@de.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 Reviewed-by: Heiko Carstens Signed-off-by: Cornelia Huck --- 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