Commit de35089c authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/disassembler: remove confusing code 



When searching the opcode offset table within find_insn() the check
"entry->opcode == 0" was intended to clarify that 1-byte opcodes, the
first one being 0, are special.

However there is no mnemonic for an illegal opcode starting with 0.
Therefore there is also no opcode offset table entry that matches,
which again means that the check never is true. Therefore just remove
the confusing check, and add a comment which hopefully explains how
this works.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 3241d3eb

arch/s390/kernel/dis.c

+6 −1
Original line number Diff line number Diff line
@@ -396,9 +396,14 @@ struct s390_insn *find_insn(unsigned char *code) 
	unsigned char opfrag;

	int i;



	/* Search the opcode offset table to find an entry which

	 * matches the beginning of the opcode. If there is no match

	 * the last entry will be used, which is the default entry for

	 * unknown instructions as well as 1-byte opcode instructions.

	 */

	for (i = 0; i < ARRAY_SIZE(opcode_offset); i++) {

		entry = &opcode_offset[i];

		if (entry->opcode == code[0] || entry->opcode == 0)

		if (entry->opcode == code[0])

			break;

	}