409 lines
10 KiB
C
409 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2019 ARM Limited */
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <sys/auxv.h>
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#include <linux/auxvec.h>
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#include <ucontext.h>
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#include <asm/unistd.h>
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#include <kselftest.h>
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#include "test_signals.h"
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#include "test_signals_utils.h"
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#include "testcases/testcases.h"
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extern struct tdescr *current;
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static int sig_copyctx = SIGTRAP;
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static char const *const feats_names[FMAX_END] = {
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" SSBS ",
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" SVE ",
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" SME ",
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" FA64 ",
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" SME2 ",
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};
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#define MAX_FEATS_SZ 128
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static char feats_string[MAX_FEATS_SZ];
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static inline char *feats_to_string(unsigned long feats)
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{
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size_t flen = MAX_FEATS_SZ - 1;
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feats_string[0] = '\0';
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for (int i = 0; i < FMAX_END; i++) {
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if (feats & (1UL << i)) {
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size_t tlen = strlen(feats_names[i]);
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assert(flen > tlen);
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flen -= tlen;
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strncat(feats_string, feats_names[i], flen);
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}
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}
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return feats_string;
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}
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static void unblock_signal(int signum)
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{
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sigset_t sset;
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sigemptyset(&sset);
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sigaddset(&sset, signum);
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sigprocmask(SIG_UNBLOCK, &sset, NULL);
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}
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static void default_result(struct tdescr *td, bool force_exit)
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{
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if (td->result == KSFT_SKIP) {
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fprintf(stderr, "==>> completed. SKIP.\n");
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} else if (td->pass) {
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fprintf(stderr, "==>> completed. PASS(1)\n");
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td->result = KSFT_PASS;
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} else {
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fprintf(stdout, "==>> completed. FAIL(0)\n");
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td->result = KSFT_FAIL;
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}
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if (force_exit)
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exit(td->result);
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}
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/*
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* The following handle_signal_* helpers are used by main default_handler
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* and are meant to return true when signal is handled successfully:
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* when false is returned instead, it means that the signal was somehow
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* unexpected in that context and it was NOT handled; default_handler will
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* take care of such unexpected situations.
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*/
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static bool handle_signal_unsupported(struct tdescr *td,
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siginfo_t *si, void *uc)
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{
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if (feats_ok(td))
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return false;
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/* Mangling PC to avoid loops on original SIGILL */
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((ucontext_t *)uc)->uc_mcontext.pc += 4;
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if (!td->initialized) {
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fprintf(stderr,
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"Got SIG_UNSUPP @test_init. Ignore.\n");
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} else {
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fprintf(stderr,
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"-- RX SIG_UNSUPP on unsupported feat...OK\n");
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td->pass = 1;
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default_result(current, 1);
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}
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return true;
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}
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static bool handle_signal_trigger(struct tdescr *td,
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siginfo_t *si, void *uc)
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{
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td->triggered = 1;
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/* ->run was asserted NON-NULL in test_setup() already */
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td->run(td, si, uc);
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return true;
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}
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static bool handle_signal_ok(struct tdescr *td,
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siginfo_t *si, void *uc)
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{
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/*
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* it's a bug in the test code when this assert fail:
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* if sig_trig was defined, it must have been used before getting here.
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*/
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assert(!td->sig_trig || td->triggered);
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fprintf(stderr,
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"SIG_OK -- SP:0x%llX si_addr@:%p si_code:%d token@:%p offset:%ld\n",
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((ucontext_t *)uc)->uc_mcontext.sp,
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si->si_addr, si->si_code, td->token, td->token - si->si_addr);
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/*
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* fake_sigreturn tests, which have sanity_enabled=1, set, at the very
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* last time, the token field to the SP address used to place the fake
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* sigframe: so token==0 means we never made it to the end,
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* segfaulting well-before, and the test is possibly broken.
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*/
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if (!td->sanity_disabled && !td->token) {
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fprintf(stdout,
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"current->token ZEROED...test is probably broken!\n");
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abort();
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}
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/*
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* Trying to narrow down the SEGV to the ones generated by Kernel itself
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* via arm64_notify_segfault(). This is a best-effort check anyway, and
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* the si_code check may need to change if this aspect of the kernel
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* ABI changes.
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*/
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if (td->sig_ok == SIGSEGV && si->si_code != SEGV_ACCERR) {
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fprintf(stdout,
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"si_code != SEGV_ACCERR...test is probably broken!\n");
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abort();
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}
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td->pass = 1;
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/*
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* Some tests can lead to SEGV loops: in such a case we want to
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* terminate immediately exiting straight away; some others are not
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* supposed to outlive the signal handler code, due to the content of
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* the fake sigframe which caused the signal itself.
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*/
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default_result(current, 1);
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return true;
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}
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static bool handle_signal_copyctx(struct tdescr *td,
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siginfo_t *si, void *uc_in)
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{
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ucontext_t *uc = uc_in;
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struct _aarch64_ctx *head;
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struct extra_context *extra, *copied_extra;
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size_t offset = 0;
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size_t to_copy;
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ASSERT_GOOD_CONTEXT(uc);
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/* Mangling PC to avoid loops on original BRK instr */
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uc->uc_mcontext.pc += 4;
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/*
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* Check for an preserve any extra data too with fixups.
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*/
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head = (struct _aarch64_ctx *)uc->uc_mcontext.__reserved;
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head = get_header(head, EXTRA_MAGIC, td->live_sz, &offset);
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if (head) {
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extra = (struct extra_context *)head;
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/*
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* The extra buffer must be immediately after the
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* extra_context and a 16 byte terminator. Include it
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* in the copy, this was previously validated in
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* ASSERT_GOOD_CONTEXT().
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*/
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to_copy = __builtin_offsetof(ucontext_t,
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uc_mcontext.__reserved);
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to_copy += offset + sizeof(struct extra_context) + 16;
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to_copy += extra->size;
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copied_extra = (struct extra_context *)&(td->live_uc->uc_mcontext.__reserved[offset]);
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} else {
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copied_extra = NULL;
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to_copy = sizeof(ucontext_t);
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}
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if (to_copy > td->live_sz) {
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fprintf(stderr,
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"Not enough space to grab context, %lu/%lu bytes\n",
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td->live_sz, to_copy);
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return false;
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}
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memcpy(td->live_uc, uc, to_copy);
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/*
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* If there was any EXTRA_CONTEXT fix up the size to be the
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* struct extra_context and the following terminator record,
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* this means that the rest of the code does not need to have
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* special handling for the record and we don't need to fix up
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* datap for the new location.
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*/
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if (copied_extra)
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copied_extra->head.size = sizeof(*copied_extra) + 16;
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td->live_uc_valid = 1;
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fprintf(stderr,
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"%lu byte GOOD CONTEXT grabbed from sig_copyctx handler\n",
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to_copy);
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return true;
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}
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static void default_handler(int signum, siginfo_t *si, void *uc)
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{
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if (current->sig_unsupp && signum == current->sig_unsupp &&
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handle_signal_unsupported(current, si, uc)) {
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fprintf(stderr, "Handled SIG_UNSUPP\n");
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} else if (current->sig_trig && signum == current->sig_trig &&
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handle_signal_trigger(current, si, uc)) {
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fprintf(stderr, "Handled SIG_TRIG\n");
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} else if (current->sig_ok && signum == current->sig_ok &&
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handle_signal_ok(current, si, uc)) {
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fprintf(stderr, "Handled SIG_OK\n");
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} else if (signum == sig_copyctx && current->live_uc &&
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handle_signal_copyctx(current, si, uc)) {
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fprintf(stderr, "Handled SIG_COPYCTX\n");
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} else {
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if (signum == SIGALRM && current->timeout) {
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fprintf(stderr, "-- Timeout !\n");
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} else {
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fprintf(stderr,
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"-- RX UNEXPECTED SIGNAL: %d\n", signum);
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}
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default_result(current, 1);
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}
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}
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static int default_setup(struct tdescr *td)
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{
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struct sigaction sa;
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sa.sa_sigaction = default_handler;
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sa.sa_flags = SA_SIGINFO | SA_RESTART;
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sa.sa_flags |= td->sa_flags;
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sigemptyset(&sa.sa_mask);
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/* uncatchable signals naturally skipped ... */
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for (int sig = 1; sig < 32; sig++)
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sigaction(sig, &sa, NULL);
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/*
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* RT Signals default disposition is Term but they cannot be
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* generated by the Kernel in response to our tests; so just catch
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* them all and report them as UNEXPECTED signals.
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*/
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for (int sig = SIGRTMIN; sig <= SIGRTMAX; sig++)
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sigaction(sig, &sa, NULL);
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/* just in case...unblock explicitly all we need */
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if (td->sig_trig)
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unblock_signal(td->sig_trig);
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if (td->sig_ok)
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unblock_signal(td->sig_ok);
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if (td->sig_unsupp)
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unblock_signal(td->sig_unsupp);
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if (td->timeout) {
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unblock_signal(SIGALRM);
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alarm(td->timeout);
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}
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fprintf(stderr, "Registered handlers for all signals.\n");
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return 1;
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}
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static inline int default_trigger(struct tdescr *td)
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{
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return !raise(td->sig_trig);
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}
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int test_init(struct tdescr *td)
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{
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if (td->sig_trig == sig_copyctx) {
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fprintf(stdout,
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"Signal %d is RESERVED, cannot be used as a trigger. Aborting\n",
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sig_copyctx);
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return 0;
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}
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/* just in case */
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unblock_signal(sig_copyctx);
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td->minsigstksz = getauxval(AT_MINSIGSTKSZ);
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if (!td->minsigstksz)
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td->minsigstksz = MINSIGSTKSZ;
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fprintf(stderr, "Detected MINSTKSIGSZ:%d\n", td->minsigstksz);
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if (td->feats_required || td->feats_incompatible) {
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td->feats_supported = 0;
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/*
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* Checking for CPU required features using both the
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* auxval and the arm64 MRS Emulation to read sysregs.
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*/
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if (getauxval(AT_HWCAP) & HWCAP_SSBS)
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td->feats_supported |= FEAT_SSBS;
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if (getauxval(AT_HWCAP) & HWCAP_SVE)
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td->feats_supported |= FEAT_SVE;
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if (getauxval(AT_HWCAP2) & HWCAP2_SME)
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td->feats_supported |= FEAT_SME;
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if (getauxval(AT_HWCAP2) & HWCAP2_SME_FA64)
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td->feats_supported |= FEAT_SME_FA64;
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if (getauxval(AT_HWCAP2) & HWCAP2_SME2)
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td->feats_supported |= FEAT_SME2;
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if (feats_ok(td)) {
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if (td->feats_required & td->feats_supported)
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fprintf(stderr,
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"Required Features: [%s] supported\n",
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feats_to_string(td->feats_required &
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td->feats_supported));
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if (!(td->feats_incompatible & td->feats_supported))
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fprintf(stderr,
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"Incompatible Features: [%s] absent\n",
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feats_to_string(td->feats_incompatible));
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} else {
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if ((td->feats_required & td->feats_supported) !=
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td->feats_supported)
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fprintf(stderr,
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"Required Features: [%s] NOT supported\n",
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feats_to_string(td->feats_required &
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~td->feats_supported));
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if (td->feats_incompatible & td->feats_supported)
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fprintf(stderr,
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"Incompatible Features: [%s] supported\n",
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feats_to_string(td->feats_incompatible &
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~td->feats_supported));
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td->result = KSFT_SKIP;
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return 0;
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}
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}
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/* Perform test specific additional initialization */
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if (td->init && !td->init(td)) {
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fprintf(stderr, "FAILED Testcase initialization.\n");
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return 0;
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}
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td->initialized = 1;
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fprintf(stderr, "Testcase initialized.\n");
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return 1;
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}
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int test_setup(struct tdescr *td)
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{
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|
|
/* assert core invariants symptom of a rotten testcase */
|
||
|
|
assert(current);
|
||
|
|
assert(td);
|
||
|
|
assert(td->name);
|
||
|
|
assert(td->run);
|
||
|
|
|
||
|
|
/* Default result is FAIL if test setup fails */
|
||
|
|
td->result = KSFT_FAIL;
|
||
|
|
if (td->setup)
|
||
|
|
return td->setup(td);
|
||
|
|
else
|
||
|
|
return default_setup(td);
|
||
|
|
}
|
||
|
|
|
||
|
|
int test_run(struct tdescr *td)
|
||
|
|
{
|
||
|
|
if (td->trigger)
|
||
|
|
return td->trigger(td);
|
||
|
|
else if (td->sig_trig)
|
||
|
|
return default_trigger(td);
|
||
|
|
else
|
||
|
|
return td->run(td, NULL, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
void test_result(struct tdescr *td)
|
||
|
|
{
|
||
|
|
if (td->initialized && td->result != KSFT_SKIP && td->check_result)
|
||
|
|
td->check_result(td);
|
||
|
|
default_result(td, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void test_cleanup(struct tdescr *td)
|
||
|
|
{
|
||
|
|
if (td->cleanup)
|
||
|
|
td->cleanup(td);
|
||
|
|
}
|