ca0e9badd1
Add a user-space selftest of x86 instruction decoder at kernel build time. When CONFIG_X86_DECODER_SELFTEST=y, Kbuild builds a test harness of x86 instruction decoder and performs it after building vmlinux. The test compares the results of objdump and x86 instruction decoder code and check there are no differences. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Przemysław Pawełczyk <przemyslaw@pawelczyk.it> Cc: Roland McGrath <roland@redhat.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Vegard Nossum <vegard.nossum@gmail.com> LKML-Reference: <20090813203421.31965.29006.stgit@localhost.localdomain> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2009
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#ifdef __x86_64__
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#define CONFIG_X86_64
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#else
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#define CONFIG_X86_32
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#endif
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#define unlikely(cond) (cond)
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#include <asm/insn.h>
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#include <inat.c>
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#include <insn.c>
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/*
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* Test of instruction analysis in general and insn_get_length() in
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* particular. See if insn_get_length() and the disassembler agree
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* on the length of each instruction in an elf disassembly.
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*
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* Usage: objdump -d a.out | awk -f distill.awk | ./test_get_len
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*/
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const char *prog;
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static void usage(void)
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{
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fprintf(stderr, "Usage: objdump -d a.out | awk -f distill.awk |"
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" ./test_get_len\n");
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exit(1);
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}
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static void malformed_line(const char *line, int line_nr)
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{
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fprintf(stderr, "%s: malformed line %d:\n%s", prog, line_nr, line);
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exit(3);
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}
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#define BUFSIZE 256
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int main(int argc, char **argv)
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{
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char line[BUFSIZE];
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unsigned char insn_buf[16];
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struct insn insn;
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int insns = 0;
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prog = argv[0];
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if (argc > 1)
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usage();
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while (fgets(line, BUFSIZE, stdin)) {
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char copy[BUFSIZE], *s, *tab1, *tab2;
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int nb = 0;
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unsigned int b;
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insns++;
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memset(insn_buf, 0, 16);
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strcpy(copy, line);
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tab1 = strchr(copy, '\t');
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if (!tab1)
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malformed_line(line, insns);
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s = tab1 + 1;
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s += strspn(s, " ");
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tab2 = strchr(s, '\t');
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if (!tab2)
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malformed_line(line, insns);
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*tab2 = '\0'; /* Characters beyond tab2 aren't examined */
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while (s < tab2) {
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if (sscanf(s, "%x", &b) == 1) {
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insn_buf[nb++] = (unsigned char) b;
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s += 3;
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} else
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break;
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}
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/* Decode an instruction */
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#ifdef __x86_64__
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insn_init(&insn, insn_buf, 1);
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#else
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insn_init(&insn, insn_buf, 0);
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#endif
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insn_get_length(&insn);
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if (insn.length != nb) {
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fprintf(stderr, "Error: %s", line);
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fprintf(stderr, "Error: objdump says %d bytes, but "
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"insn_get_length() says %d (attr:%x)\n", nb,
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insn.length, insn.attr);
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exit(2);
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}
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}
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fprintf(stderr, "Succeed: decoded and checked %d instructions\n",
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insns);
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return 0;
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}
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