selftests/powerpc: Add alignment handler selftest
Add a selftest to exercise the powerpc alignment fault handler. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> [mpe: Add 32-bit support to the signal handler] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Andrew Donnellan
Michael Ellerman
parent
57ad583f20
commit
8d1915873d
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@ -1,4 +1,5 @@
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TEST_GEN_PROGS := copy_unaligned copy_first_unaligned paste_unaligned paste_last_unaligned
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TEST_GEN_PROGS := copy_unaligned copy_first_unaligned paste_unaligned \
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paste_last_unaligned alignment_handler
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include ../../lib.mk
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@ -0,0 +1,491 @@
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/*
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* Test the powerpc alignment handler on POWER8/POWER9
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*
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* Copyright (C) 2017 IBM Corporation (Michael Neuling, Andrew Donnellan)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* This selftest exercises the powerpc alignment fault handler.
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*
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* We create two sets of source and destination buffers, one in regular memory,
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* the other cache-inhibited (we use /dev/fb0 for this).
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*
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* We initialise the source buffers, then use whichever set of load/store
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* instructions is under test to copy bytes from the source buffers to the
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* destination buffers. For the regular buffers, these instructions will
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* execute normally. For the cache-inhibited buffers, these instructions
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* will trap and cause an alignment fault, and the alignment fault handler
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* will emulate the particular instruction under test. We then compare the
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* destination buffers to ensure that the native and emulated cases give the
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* same result.
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*
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* TODO:
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* - Any FIXMEs below
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* - Test VSX regs < 32 and > 32
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* - Test all loads and stores
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* - Check update forms do update register
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* - Test alignment faults over page boundary
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*
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* Some old binutils may not support all the instructions.
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*/
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <getopt.h>
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#include <setjmp.h>
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#include <signal.h>
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#include "utils.h"
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int bufsize;
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int debug;
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int testing;
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volatile int gotsig;
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void sighandler(int sig, siginfo_t *info, void *ctx)
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{
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struct ucontext *ucp = ctx;
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if (!testing) {
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signal(sig, SIG_DFL);
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kill(0, sig);
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}
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gotsig = sig;
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#ifdef __powerpc64__
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ucp->uc_mcontext.gp_regs[PT_NIP] += 4;
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#else
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ucp->uc_mcontext.uc_regs->gregs[PT_NIP] += 4;
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#endif
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}
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#define XFORM(reg, n) " " #reg " ,%"#n",%2 ;"
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#define DFORM(reg, n) " " #reg " ,0(%"#n") ;"
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#define TEST(name, ld_op, st_op, form, ld_reg, st_reg) \
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void test_##name(char *s, char *d) \
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{ \
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asm volatile( \
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#ld_op form(ld_reg, 0) \
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#st_op form(st_reg, 1) \
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:: "r"(s), "r"(d), "r"(0) \
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: "memory", "vs0", "vs32", "r31"); \
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} \
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rc |= do_test(#name, test_##name)
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#define LOAD_VSX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 32, 32)
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#define STORE_VSX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 32)
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#define LOAD_VSX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 32, 32)
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#define STORE_VSX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 32)
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#define LOAD_VMX_XFORM_TEST(op) TEST(op, op, stxvd2x, XFORM, 0, 32)
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#define STORE_VMX_XFORM_TEST(op) TEST(op, lxvd2x, op, XFORM, 32, 0)
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#define LOAD_VMX_DFORM_TEST(op) TEST(op, op, stxv, DFORM, 0, 32)
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#define STORE_VMX_DFORM_TEST(op) TEST(op, lxv, op, DFORM, 32, 0)
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#define LOAD_XFORM_TEST(op) TEST(op, op, stdx, XFORM, 31, 31)
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#define STORE_XFORM_TEST(op) TEST(op, ldx, op, XFORM, 31, 31)
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#define LOAD_DFORM_TEST(op) TEST(op, op, std, DFORM, 31, 31)
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#define STORE_DFORM_TEST(op) TEST(op, ld, op, DFORM, 31, 31)
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#define LOAD_FLOAT_DFORM_TEST(op) TEST(op, op, stfd, DFORM, 0, 0)
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#define STORE_FLOAT_DFORM_TEST(op) TEST(op, lfd, op, DFORM, 0, 0)
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#define LOAD_FLOAT_XFORM_TEST(op) TEST(op, op, stfdx, XFORM, 0, 0)
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#define STORE_FLOAT_XFORM_TEST(op) TEST(op, lfdx, op, XFORM, 0, 0)
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/* FIXME: Unimplemented tests: */
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// STORE_DFORM_TEST(stq) /* FIXME: need two registers for quad */
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// STORE_DFORM_TEST(stswi) /* FIXME: string instruction */
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// STORE_XFORM_TEST(stwat) /* AMO can't emulate or run on CI */
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// STORE_XFORM_TEST(stdat) /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
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/* preload byte by byte */
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void preload_data(void *dst, int offset, int width)
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{
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char *c = dst;
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int i;
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c += offset;
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for (i = 0 ; i < width ; i++)
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c[i] = i;
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}
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int test_memcpy(void *dst, void *src, int size, int offset,
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void (*test_func)(char *, char *))
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{
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char *s, *d;
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s = src;
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s += offset;
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d = dst;
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d += offset;
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assert(size == 16);
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gotsig = 0;
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testing = 1;
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test_func(s, d); /* run the actual test */
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testing = 0;
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if (gotsig) {
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if (debug)
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printf(" Got signal %i\n", gotsig);
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return 1;
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}
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return 0;
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}
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void dumpdata(char *s1, char *s2, int n, char *test_name)
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{
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int i;
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printf(" %s: unexpected result:\n", test_name);
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printf(" mem:");
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for (i = 0; i < n; i++)
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printf(" %02x", s1[i]);
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printf("\n");
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printf(" ci: ");
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for (i = 0; i < n; i++)
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printf(" %02x", s2[i]);
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printf("\n");
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}
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int test_memcmp(void *s1, void *s2, int n, int offset, char *test_name)
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{
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char *s1c, *s2c;
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s1c = s1;
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s1c += offset;
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s2c = s2;
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s2c += offset;
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if (memcmp(s1c, s2c, n)) {
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if (debug) {
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printf("\n Compare failed. Offset:%i length:%i\n",
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offset, n);
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dumpdata(s1c, s2c, n, test_name);
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}
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return 1;
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}
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return 0;
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}
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/*
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* Do two memcpy tests using the same instructions. One cachable
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* memory and the other doesn't.
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*/
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int do_test(char *test_name, void (*test_func)(char *, char *))
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{
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int offset, width, fd, rc = 0, r;
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void *mem0, *mem1, *ci0, *ci1;
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printf("\tDoing %s:\t", test_name);
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fd = open("/dev/fb0", O_RDWR);
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if (fd < 0) {
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printf("\n");
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perror("Can't open /dev/fb0");
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SKIP_IF(1);
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}
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ci0 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
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fd, 0x0);
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ci1 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,
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fd, bufsize);
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if ((ci0 == MAP_FAILED) || (ci1 == MAP_FAILED)) {
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printf("\n");
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perror("mmap failed");
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SKIP_IF(1);
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}
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rc = posix_memalign(&mem0, bufsize, bufsize);
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if (rc) {
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printf("\n");
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return rc;
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}
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rc = posix_memalign(&mem1, bufsize, bufsize);
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if (rc) {
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printf("\n");
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free(mem0);
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return rc;
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}
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/* offset = 0 no alignment fault, so skip */
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for (offset = 1; offset < 16; offset++) {
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width = 16; /* vsx == 16 bytes */
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r = 0;
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/* load pattern into memory byte by byte */
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preload_data(ci0, offset, width);
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preload_data(mem0, offset, width); // FIXME: remove??
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memcpy(ci0, mem0, bufsize);
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memcpy(ci1, mem1, bufsize); /* initialise output to the same */
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/* sanity check */
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test_memcmp(mem0, ci0, width, offset, test_name);
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r |= test_memcpy(ci1, ci0, width, offset, test_func);
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r |= test_memcpy(mem1, mem0, width, offset, test_func);
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if (r && !debug) {
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printf("FAILED: Got signal");
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break;
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}
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r |= test_memcmp(mem1, ci1, width, offset, test_name);
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rc |= r;
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if (r && !debug) {
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printf("FAILED: Wrong Data");
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break;
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}
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}
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if (!r)
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printf("PASSED");
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printf("\n");
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munmap(ci0, bufsize);
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munmap(ci1, bufsize);
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free(mem0);
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free(mem1);
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return rc;
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}
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int test_alignment_handler_vsx_206(void)
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{
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int rc = 0;
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printf("VSX: 2.06B\n");
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LOAD_VSX_XFORM_TEST(lxvd2x);
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LOAD_VSX_XFORM_TEST(lxvw4x);
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LOAD_VSX_XFORM_TEST(lxsdx);
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LOAD_VSX_XFORM_TEST(lxvdsx);
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STORE_VSX_XFORM_TEST(stxvd2x);
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STORE_VSX_XFORM_TEST(stxvw4x);
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STORE_VSX_XFORM_TEST(stxsdx);
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return rc;
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}
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int test_alignment_handler_vsx_207(void)
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{
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int rc = 0;
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printf("VSX: 2.07B\n");
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LOAD_VSX_XFORM_TEST(lxsspx);
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LOAD_VSX_XFORM_TEST(lxsiwax);
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LOAD_VSX_XFORM_TEST(lxsiwzx);
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STORE_VSX_XFORM_TEST(stxsspx);
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STORE_VSX_XFORM_TEST(stxsiwx);
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return rc;
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}
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int test_alignment_handler_vsx_300(void)
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{
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int rc = 0;
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SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));
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printf("VSX: 3.00B\n");
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LOAD_VMX_DFORM_TEST(lxsd);
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LOAD_VSX_XFORM_TEST(lxsibzx);
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LOAD_VSX_XFORM_TEST(lxsihzx);
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LOAD_VMX_DFORM_TEST(lxssp);
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LOAD_VSX_DFORM_TEST(lxv);
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LOAD_VSX_XFORM_TEST(lxvb16x);
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LOAD_VSX_XFORM_TEST(lxvh8x);
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LOAD_VSX_XFORM_TEST(lxvx);
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LOAD_VSX_XFORM_TEST(lxvwsx);
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LOAD_VSX_XFORM_TEST(lxvl);
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LOAD_VSX_XFORM_TEST(lxvll);
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STORE_VMX_DFORM_TEST(stxsd);
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STORE_VSX_XFORM_TEST(stxsibx);
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STORE_VSX_XFORM_TEST(stxsihx);
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STORE_VMX_DFORM_TEST(stxssp);
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STORE_VSX_DFORM_TEST(stxv);
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STORE_VSX_XFORM_TEST(stxvb16x);
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STORE_VSX_XFORM_TEST(stxvh8x);
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STORE_VSX_XFORM_TEST(stxvx);
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STORE_VSX_XFORM_TEST(stxvl);
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STORE_VSX_XFORM_TEST(stxvll);
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return rc;
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}
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int test_alignment_handler_integer(void)
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{
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int rc = 0;
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printf("Integer\n");
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LOAD_DFORM_TEST(lbz);
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LOAD_DFORM_TEST(lbzu);
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LOAD_XFORM_TEST(lbzx);
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LOAD_XFORM_TEST(lbzux);
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LOAD_DFORM_TEST(lhz);
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LOAD_DFORM_TEST(lhzu);
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LOAD_XFORM_TEST(lhzx);
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LOAD_XFORM_TEST(lhzux);
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LOAD_DFORM_TEST(lha);
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LOAD_DFORM_TEST(lhau);
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LOAD_XFORM_TEST(lhax);
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LOAD_XFORM_TEST(lhaux);
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LOAD_XFORM_TEST(lhbrx);
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LOAD_DFORM_TEST(lwz);
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LOAD_DFORM_TEST(lwzu);
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LOAD_XFORM_TEST(lwzx);
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LOAD_XFORM_TEST(lwzux);
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LOAD_DFORM_TEST(lwa);
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LOAD_XFORM_TEST(lwax);
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LOAD_XFORM_TEST(lwaux);
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LOAD_XFORM_TEST(lwbrx);
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LOAD_DFORM_TEST(ld);
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LOAD_DFORM_TEST(ldu);
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LOAD_XFORM_TEST(ldx);
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LOAD_XFORM_TEST(ldux);
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LOAD_XFORM_TEST(ldbrx);
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LOAD_DFORM_TEST(lmw);
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STORE_DFORM_TEST(stb);
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STORE_XFORM_TEST(stbx);
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STORE_DFORM_TEST(stbu);
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STORE_XFORM_TEST(stbux);
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STORE_DFORM_TEST(sth);
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STORE_XFORM_TEST(sthx);
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STORE_DFORM_TEST(sthu);
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STORE_XFORM_TEST(sthux);
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STORE_XFORM_TEST(sthbrx);
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STORE_DFORM_TEST(stw);
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STORE_XFORM_TEST(stwx);
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STORE_DFORM_TEST(stwu);
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STORE_XFORM_TEST(stwux);
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STORE_XFORM_TEST(stwbrx);
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STORE_DFORM_TEST(std);
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STORE_XFORM_TEST(stdx);
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STORE_DFORM_TEST(stdu);
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STORE_XFORM_TEST(stdux);
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STORE_XFORM_TEST(stdbrx);
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STORE_DFORM_TEST(stmw);
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return rc;
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}
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int test_alignment_handler_vmx(void)
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{
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int rc = 0;
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printf("VMX\n");
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LOAD_VMX_XFORM_TEST(lvx);
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/*
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* FIXME: These loads only load part of the register, so our
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* testing method doesn't work. Also they don't take alignment
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* faults, so it's kinda pointless anyway
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*
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LOAD_VMX_XFORM_TEST(lvebx)
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LOAD_VMX_XFORM_TEST(lvehx)
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LOAD_VMX_XFORM_TEST(lvewx)
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LOAD_VMX_XFORM_TEST(lvxl)
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*/
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STORE_VMX_XFORM_TEST(stvx);
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STORE_VMX_XFORM_TEST(stvebx);
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STORE_VMX_XFORM_TEST(stvehx);
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STORE_VMX_XFORM_TEST(stvewx);
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STORE_VMX_XFORM_TEST(stvxl);
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return rc;
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}
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int test_alignment_handler_fp(void)
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{
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int rc = 0;
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printf("Floating point\n");
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LOAD_FLOAT_DFORM_TEST(lfd);
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LOAD_FLOAT_XFORM_TEST(lfdx);
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LOAD_FLOAT_DFORM_TEST(lfdp);
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LOAD_FLOAT_XFORM_TEST(lfdpx);
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LOAD_FLOAT_DFORM_TEST(lfdu);
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LOAD_FLOAT_XFORM_TEST(lfdux);
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LOAD_FLOAT_DFORM_TEST(lfs);
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LOAD_FLOAT_XFORM_TEST(lfsx);
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LOAD_FLOAT_DFORM_TEST(lfsu);
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LOAD_FLOAT_XFORM_TEST(lfsux);
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LOAD_FLOAT_XFORM_TEST(lfiwzx);
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LOAD_FLOAT_XFORM_TEST(lfiwax);
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STORE_FLOAT_DFORM_TEST(stfd);
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STORE_FLOAT_XFORM_TEST(stfdx);
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STORE_FLOAT_DFORM_TEST(stfdp);
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STORE_FLOAT_XFORM_TEST(stfdpx);
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STORE_FLOAT_DFORM_TEST(stfdu);
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STORE_FLOAT_XFORM_TEST(stfdux);
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STORE_FLOAT_DFORM_TEST(stfs);
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STORE_FLOAT_XFORM_TEST(stfsx);
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STORE_FLOAT_DFORM_TEST(stfsu);
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STORE_FLOAT_XFORM_TEST(stfsux);
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STORE_FLOAT_XFORM_TEST(stfiwx);
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return rc;
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}
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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;
|
||||
}
|
||||
Loading…
Reference in New Issue