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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>
This commit is contained in:
Cornelia Huck 2012-07-23 17:20:28 +02:00 committed by Avi Kivity
parent 23d43cf998
commit 9b7fb990e0
2 changed files with 28 additions and 0 deletions
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1
arch/s390/include/asm/processor.h
View File

@ -138,6 +138,7 @@ 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 *) \

27
arch/s390/kernel/dis.c
View File

@ -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;