[B][SRU][PATCH 1/2] selftests/powerpc: Add alignment handler selftest
Po-Hsu Lin
po-hsu.lin at canonical.com
Tue May 14 06:57:49 UTC 2019
From: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
BugLink: https://bugs.launchpad.net/bugs/1828935
Add a selftest to exercise the powerpc alignment fault handler.
Signed-off-by: Michael Neuling <mikey at neuling.org>
Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
[mpe: Add 32-bit support to the signal handler]
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
(cherry picked from commit 8d1915873d492b8e1f03bbcab527db62a8d49542)
Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
---
tools/testing/selftests/powerpc/alignment/Makefile | 3 +-
.../powerpc/alignment/alignment_handler.c | 491 +++++++++++++++++++++
2 files changed, 493 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/alignment/alignment_handler.c
diff --git a/tools/testing/selftests/powerpc/alignment/Makefile b/tools/testing/selftests/powerpc/alignment/Makefile
index 16b2200..083a48a 100644
--- a/tools/testing/selftests/powerpc/alignment/Makefile
+++ b/tools/testing/selftests/powerpc/alignment/Makefile
@@ -1,4 +1,5 @@
-TEST_GEN_PROGS := copy_unaligned copy_first_unaligned paste_unaligned paste_last_unaligned
+TEST_GEN_PROGS := copy_unaligned copy_first_unaligned paste_unaligned \
+ paste_last_unaligned alignment_handler
include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/alignment/alignment_handler.c b/tools/testing/selftests/powerpc/alignment/alignment_handler.c
new file mode 100644
index 0000000..39fd362
--- /dev/null
+++ b/tools/testing/selftests/powerpc/alignment/alignment_handler.c
@@ -0,0 +1,491 @@
+/*
+ * Test the powerpc alignment handler on POWER8/POWER9
+ *
+ * Copyright (C) 2017 IBM Corporation (Michael Neuling, Andrew Donnellan)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * This selftest exercises the powerpc alignment fault handler.
+ *
+ * We create two sets of source and destination buffers, one in regular memory,
+ * the other cache-inhibited (we use /dev/fb0 for this).
+ *
+ * We initialise the source buffers, then use whichever set of load/store
+ * instructions is under test to copy bytes from the source buffers to the
+ * destination buffers. For the regular buffers, these instructions will
+ * execute normally. For the cache-inhibited buffers, these instructions
+ * will trap and cause an alignment fault, and the alignment fault handler
+ * will emulate the particular instruction under test. We then compare the
+ * destination buffers to ensure that the native and emulated cases give the
+ * same result.
+ *
+ * TODO:
+ * - Any FIXMEs below
+ * - Test VSX regs < 32 and > 32
+ * - Test all loads and stores
+ * - Check update forms do update register
+ * - Test alignment faults over page boundary
+ *
+ * Some old binutils may not support all the instructions.
+ */
+
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <getopt.h>
+#include <setjmp.h>
+#include <signal.h>
+
+#include "utils.h"
+
+int bufsize;
+int debug;
+int testing;
+volatile int gotsig;
+
+void sighandler(int sig, siginfo_t *info, void *ctx)
+{
+ struct ucontext *ucp = ctx;
+
+ if (!testing) {
+ signal(sig, SIG_DFL);
+ kill(0, sig);
+ }
+ gotsig = sig;
+#ifdef __powerpc64__
+ ucp->uc_mcontext.gp_regs[PT_NIP] += 4;
+#else
+ ucp->uc_mcontext.uc_regs->gregs[PT_NIP] += 4;
+#endif
+}
+
+#define XFORM(reg, n) " " #reg " ,%"#n",%2 ;"
+#define DFORM(reg, n) " " #reg " ,0(%"#n") ;"
+
+#define TEST(name, ld_op, st_op, form, ld_reg, st_reg) \
+ void test_##name(char *s, char *d) \
+ { \
+ asm volatile( \
+ #ld_op form(ld_reg, 0) \
+ #st_op form(st_reg, 1) \
+ :: "r"(s), "r"(d), "r"(0) \
+ : "memory", "vs0", "vs32", "r31"); \
+ } \
+ rc |= do_test(#name, test_##name)
+
+#define LOAD_VSX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 32, 32)
+#define STORE_VSX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 32)
+#define LOAD_VSX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 32, 32)
+#define STORE_VSX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 32)
+#define LOAD_VMX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 0, 32)
+#define STORE_VMX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 0)
+#define LOAD_VMX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 0, 32)
+#define STORE_VMX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 0)
+
+#define LOAD_XFORM_TEST(op) TEST(op, op, stdx, XFORM, 31, 31)
+#define STORE_XFORM_TEST(op) TEST(op, ldx, op, XFORM, 31, 31)
+#define LOAD_DFORM_TEST(op) TEST(op, op, std, DFORM, 31, 31)
+#define STORE_DFORM_TEST(op) TEST(op, ld, op, DFORM, 31, 31)
+
+#define LOAD_FLOAT_DFORM_TEST(op) TEST(op, op, stfd, DFORM, 0, 0)
+#define STORE_FLOAT_DFORM_TEST(op) TEST(op, lfd, op, DFORM, 0, 0)
+#define LOAD_FLOAT_XFORM_TEST(op) TEST(op, op, stfdx, XFORM, 0, 0)
+#define STORE_FLOAT_XFORM_TEST(op) TEST(op, lfdx, op, XFORM, 0, 0)
+
+
+/* FIXME: Unimplemented tests: */
+// STORE_DFORM_TEST(stq) /* FIXME: need two registers for quad */
+// STORE_DFORM_TEST(stswi) /* FIXME: string instruction */
+
+// STORE_XFORM_TEST(stwat) /* AMO can't emulate or run on CI */
+// STORE_XFORM_TEST(stdat) /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
+
+
+/* preload byte by byte */
+void preload_data(void *dst, int offset, int width)
+{
+ char *c = dst;
+ int i;
+
+ c += offset;
+
+ for (i = 0 ; i < width ; i++)
+ c[i] = i;
+}
+
+int test_memcpy(void *dst, void *src, int size, int offset,
+ void (*test_func)(char *, char *))
+{
+ char *s, *d;
+
+ s = src;
+ s += offset;
+ d = dst;
+ d += offset;
+
+ assert(size == 16);
+ gotsig = 0;
+ testing = 1;
+
+ test_func(s, d); /* run the actual test */
+
+ testing = 0;
+ if (gotsig) {
+ if (debug)
+ printf(" Got signal %i\n", gotsig);
+ return 1;
+ }
+ return 0;
+}
+
+void dumpdata(char *s1, char *s2, int n, char *test_name)
+{
+ int i;
+
+ printf(" %s: unexpected result:\n", test_name);
+ printf(" mem:");
+ for (i = 0; i < n; i++)
+ printf(" %02x", s1[i]);
+ printf("\n");
+ printf(" ci: ");
+ for (i = 0; i < n; i++)
+ printf(" %02x", s2[i]);
+ printf("\n");
+}
+
+int test_memcmp(void *s1, void *s2, int n, int offset, char *test_name)
+{
+ char *s1c, *s2c;
+
+ s1c = s1;
+ s1c += offset;
+ s2c = s2;
+ s2c += offset;
+
+ if (memcmp(s1c, s2c, n)) {
+ if (debug) {
+ printf("\n Compare failed. Offset:%i length:%i\n",
+ offset, n);
+ dumpdata(s1c, s2c, n, test_name);
+ }
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Do two memcpy tests using the same instructions. One cachable
+ * memory and the other doesn't.
+ */
+int do_test(char *test_name, void (*test_func)(char *, char *))
+{
+ int offset, width, fd, rc = 0, r;
+ void *mem0, *mem1, *ci0, *ci1;
+
+ printf("\tDoing %s:\t", test_name);
+
+ fd = open("/dev/fb0", O_RDWR);
+ if (fd < 0) {
+ printf("\n");
+ perror("Can't open /dev/fb0");
+ SKIP_IF(1);
+ }
+
+ ci0 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
+ fd, 0x0);
+ ci1 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
+ fd, bufsize);
+ if ((ci0 == MAP_FAILED) || (ci1 == MAP_FAILED)) {
+ printf("\n");
+ perror("mmap failed");
+ SKIP_IF(1);
+ }
+
+ rc = posix_memalign(&mem0, bufsize, bufsize);
+ if (rc) {
+ printf("\n");
+ return rc;
+ }
+
+ rc = posix_memalign(&mem1, bufsize, bufsize);
+ if (rc) {
+ printf("\n");
+ free(mem0);
+ return rc;
+ }
+
+ /* offset = 0 no alignment fault, so skip */
+ for (offset = 1; offset < 16; offset++) {
+ width = 16; /* vsx == 16 bytes */
+ r = 0;
+
+ /* load pattern into memory byte by byte */
+ preload_data(ci0, offset, width);
+ preload_data(mem0, offset, width); // FIXME: remove??
+ memcpy(ci0, mem0, bufsize);
+ memcpy(ci1, mem1, bufsize); /* initialise output to the same */
+
+ /* sanity check */
+ test_memcmp(mem0, ci0, width, offset, test_name);
+
+ r |= test_memcpy(ci1, ci0, width, offset, test_func);
+ r |= test_memcpy(mem1, mem0, width, offset, test_func);
+ if (r && !debug) {
+ printf("FAILED: Got signal");
+ break;
+ }
+
+ r |= test_memcmp(mem1, ci1, width, offset, test_name);
+ rc |= r;
+ if (r && !debug) {
+ printf("FAILED: Wrong Data");
+ break;
+ }
+ }
+ if (!r)
+ printf("PASSED");
+ printf("\n");
+
+ munmap(ci0, bufsize);
+ munmap(ci1, bufsize);
+ free(mem0);
+ free(mem1);
+
+ return rc;
+}
+
+int test_alignment_handler_vsx_206(void)
+{
+ int rc = 0;
+
+ printf("VSX: 2.06B\n");
+ LOAD_VSX_XFORM_TEST(lxvd2x);
+ LOAD_VSX_XFORM_TEST(lxvw4x);
+ LOAD_VSX_XFORM_TEST(lxsdx);
+ LOAD_VSX_XFORM_TEST(lxvdsx);
+ STORE_VSX_XFORM_TEST(stxvd2x);
+ STORE_VSX_XFORM_TEST(stxvw4x);
+ STORE_VSX_XFORM_TEST(stxsdx);
+ return rc;
+}
+
+int test_alignment_handler_vsx_207(void)
+{
+ int rc = 0;
+
+ printf("VSX: 2.07B\n");
+ LOAD_VSX_XFORM_TEST(lxsspx);
+ LOAD_VSX_XFORM_TEST(lxsiwax);
+ LOAD_VSX_XFORM_TEST(lxsiwzx);
+ STORE_VSX_XFORM_TEST(stxsspx);
+ STORE_VSX_XFORM_TEST(stxsiwx);
+ return rc;
+}
+
+int test_alignment_handler_vsx_300(void)
+{
+ int rc = 0;
+
+ SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));
+ printf("VSX: 3.00B\n");
+ LOAD_VMX_DFORM_TEST(lxsd);
+ LOAD_VSX_XFORM_TEST(lxsibzx);
+ LOAD_VSX_XFORM_TEST(lxsihzx);
+ LOAD_VMX_DFORM_TEST(lxssp);
+ LOAD_VSX_DFORM_TEST(lxv);
+ LOAD_VSX_XFORM_TEST(lxvb16x);
+ LOAD_VSX_XFORM_TEST(lxvh8x);
+ LOAD_VSX_XFORM_TEST(lxvx);
+ LOAD_VSX_XFORM_TEST(lxvwsx);
+ LOAD_VSX_XFORM_TEST(lxvl);
+ LOAD_VSX_XFORM_TEST(lxvll);
+ STORE_VMX_DFORM_TEST(stxsd);
+ STORE_VSX_XFORM_TEST(stxsibx);
+ STORE_VSX_XFORM_TEST(stxsihx);
+ STORE_VMX_DFORM_TEST(stxssp);
+ STORE_VSX_DFORM_TEST(stxv);
+ STORE_VSX_XFORM_TEST(stxvb16x);
+ STORE_VSX_XFORM_TEST(stxvh8x);
+ STORE_VSX_XFORM_TEST(stxvx);
+ STORE_VSX_XFORM_TEST(stxvl);
+ STORE_VSX_XFORM_TEST(stxvll);
+ return rc;
+}
+
+int test_alignment_handler_integer(void)
+{
+ int rc = 0;
+
+ printf("Integer\n");
+ LOAD_DFORM_TEST(lbz);
+ LOAD_DFORM_TEST(lbzu);
+ LOAD_XFORM_TEST(lbzx);
+ LOAD_XFORM_TEST(lbzux);
+ LOAD_DFORM_TEST(lhz);
+ LOAD_DFORM_TEST(lhzu);
+ LOAD_XFORM_TEST(lhzx);
+ LOAD_XFORM_TEST(lhzux);
+ LOAD_DFORM_TEST(lha);
+ LOAD_DFORM_TEST(lhau);
+ LOAD_XFORM_TEST(lhax);
+ LOAD_XFORM_TEST(lhaux);
+ LOAD_XFORM_TEST(lhbrx);
+ LOAD_DFORM_TEST(lwz);
+ LOAD_DFORM_TEST(lwzu);
+ LOAD_XFORM_TEST(lwzx);
+ LOAD_XFORM_TEST(lwzux);
+ LOAD_DFORM_TEST(lwa);
+ LOAD_XFORM_TEST(lwax);
+ LOAD_XFORM_TEST(lwaux);
+ LOAD_XFORM_TEST(lwbrx);
+ LOAD_DFORM_TEST(ld);
+ LOAD_DFORM_TEST(ldu);
+ LOAD_XFORM_TEST(ldx);
+ LOAD_XFORM_TEST(ldux);
+ LOAD_XFORM_TEST(ldbrx);
+ LOAD_DFORM_TEST(lmw);
+ STORE_DFORM_TEST(stb);
+ STORE_XFORM_TEST(stbx);
+ STORE_DFORM_TEST(stbu);
+ STORE_XFORM_TEST(stbux);
+ STORE_DFORM_TEST(sth);
+ STORE_XFORM_TEST(sthx);
+ STORE_DFORM_TEST(sthu);
+ STORE_XFORM_TEST(sthux);
+ STORE_XFORM_TEST(sthbrx);
+ STORE_DFORM_TEST(stw);
+ STORE_XFORM_TEST(stwx);
+ STORE_DFORM_TEST(stwu);
+ STORE_XFORM_TEST(stwux);
+ STORE_XFORM_TEST(stwbrx);
+ STORE_DFORM_TEST(std);
+ STORE_XFORM_TEST(stdx);
+ STORE_DFORM_TEST(stdu);
+ STORE_XFORM_TEST(stdux);
+ STORE_XFORM_TEST(stdbrx);
+ STORE_DFORM_TEST(stmw);
+ return rc;
+}
+
+int test_alignment_handler_vmx(void)
+{
+ int rc = 0;
+
+ printf("VMX\n");
+ LOAD_VMX_XFORM_TEST(lvx);
+
+ /*
+ * FIXME: These loads only load part of the register, so our
+ * testing method doesn't work. Also they don't take alignment
+ * faults, so it's kinda pointless anyway
+ *
+ LOAD_VMX_XFORM_TEST(lvebx)
+ LOAD_VMX_XFORM_TEST(lvehx)
+ LOAD_VMX_XFORM_TEST(lvewx)
+ LOAD_VMX_XFORM_TEST(lvxl)
+ */
+ STORE_VMX_XFORM_TEST(stvx);
+ STORE_VMX_XFORM_TEST(stvebx);
+ STORE_VMX_XFORM_TEST(stvehx);
+ STORE_VMX_XFORM_TEST(stvewx);
+ STORE_VMX_XFORM_TEST(stvxl);
+ return rc;
+}
+
+int test_alignment_handler_fp(void)
+{
+ int rc = 0;
+
+ printf("Floating point\n");
+ LOAD_FLOAT_DFORM_TEST(lfd);
+ LOAD_FLOAT_XFORM_TEST(lfdx);
+ LOAD_FLOAT_DFORM_TEST(lfdp);
+ LOAD_FLOAT_XFORM_TEST(lfdpx);
+ LOAD_FLOAT_DFORM_TEST(lfdu);
+ LOAD_FLOAT_XFORM_TEST(lfdux);
+ LOAD_FLOAT_DFORM_TEST(lfs);
+ LOAD_FLOAT_XFORM_TEST(lfsx);
+ LOAD_FLOAT_DFORM_TEST(lfsu);
+ LOAD_FLOAT_XFORM_TEST(lfsux);
+ LOAD_FLOAT_XFORM_TEST(lfiwzx);
+ LOAD_FLOAT_XFORM_TEST(lfiwax);
+ STORE_FLOAT_DFORM_TEST(stfd);
+ STORE_FLOAT_XFORM_TEST(stfdx);
+ STORE_FLOAT_DFORM_TEST(stfdp);
+ STORE_FLOAT_XFORM_TEST(stfdpx);
+ STORE_FLOAT_DFORM_TEST(stfdu);
+ STORE_FLOAT_XFORM_TEST(stfdux);
+ STORE_FLOAT_DFORM_TEST(stfs);
+ STORE_FLOAT_XFORM_TEST(stfsx);
+ STORE_FLOAT_DFORM_TEST(stfsu);
+ STORE_FLOAT_XFORM_TEST(stfsux);
+ STORE_FLOAT_XFORM_TEST(stfiwx);
+
+ return rc;
+}
+
+void usage(char *prog)
+{
+ printf("Usage: %s [options]\n", prog);
+ printf(" -d Enable debug error output\n");
+ printf("\n");
+ printf("This test requires a POWER8 or POWER9 CPU and a usable ");
+ printf("framebuffer at /dev/fb0.\n");
+}
+
+int main(int argc, char *argv[])
+{
+
+ struct sigaction sa;
+ int rc = 0;
+ int option = 0;
+
+ while ((option = getopt(argc, argv, "d")) != -1) {
+ switch (option) {
+ case 'd':
+ debug++;
+ break;
+ default:
+ usage(argv[0]);
+ exit(1);
+ }
+ }
+
+ bufsize = getpagesize();
+
+ sa.sa_sigaction = sighandler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_SIGINFO;
+ if (sigaction(SIGSEGV, &sa, NULL) == -1
+ || sigaction(SIGBUS, &sa, NULL) == -1
+ || sigaction(SIGILL, &sa, NULL) == -1) {
+ perror("sigaction");
+ exit(1);
+ }
+
+ rc |= test_harness(test_alignment_handler_vsx_206,
+ "test_alignment_handler_vsx_206");
+ rc |= test_harness(test_alignment_handler_vsx_207,
+ "test_alignment_handler_vsx_207");
+ rc |= test_harness(test_alignment_handler_vsx_300,
+ "test_alignment_handler_vsx_300");
+ rc |= test_harness(test_alignment_handler_integer,
+ "test_alignment_handler_integer");
+ rc |= test_harness(test_alignment_handler_vmx,
+ "test_alignment_handler_vmx");
+ rc |= test_harness(test_alignment_handler_fp,
+ "test_alignment_handler_fp");
+ return rc;
+}
--
2.7.4
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