91 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2022 ARM Limited4 *5 * Verify that the TPIDR2 register context in signal frames is set up as6 * expected.7 */8 9#include <signal.h>10#include <ucontext.h>11#include <sys/auxv.h>12#include <sys/prctl.h>13#include <unistd.h>14#include <asm/sigcontext.h>15 16#include "test_signals_utils.h"17#include "testcases.h"18 19static union {20 ucontext_t uc;21 char buf[1024 * 128];22} context;23 24#define SYS_TPIDR2 "S3_3_C13_C0_5"25 26static uint64_t get_tpidr2(void)27{28 uint64_t val;29 30 asm volatile (31 "mrs %0, " SYS_TPIDR2 "\n"32 : "=r"(val)33 :34 : "cc");35 36 return val;37}38 39int tpidr2_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)40{41 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);42 struct tpidr2_context *tpidr2_ctx;43 size_t offset;44 bool in_sigframe;45 bool have_sme;46 __u64 orig_tpidr2;47 48 have_sme = getauxval(AT_HWCAP2) & HWCAP2_SME;49 if (have_sme)50 orig_tpidr2 = get_tpidr2();51 52 if (!get_current_context(td, &context.uc, sizeof(context)))53 return 1;54 55 tpidr2_ctx = (struct tpidr2_context *)56 get_header(head, TPIDR2_MAGIC, td->live_sz, &offset);57 58 in_sigframe = tpidr2_ctx != NULL;59 60 fprintf(stderr, "TPIDR2 sigframe %s on system %s SME\n",61 in_sigframe ? "present" : "absent",62 have_sme ? "with" : "without");63 64 td->pass = (in_sigframe == have_sme);65 66 /*67 * Check that the value we read back was the one present at68 * the time that the signal was triggered. TPIDR2 is owned by69 * libc so we can't safely choose the value and it is possible70 * that we may need to revisit this in future if something71 * starts deciding to set a new TPIDR2 between us reading and72 * the signal.73 */74 if (have_sme && tpidr2_ctx) {75 if (tpidr2_ctx->tpidr2 != orig_tpidr2) {76 fprintf(stderr, "TPIDR2 in frame is %llx, was %llx\n",77 tpidr2_ctx->tpidr2, orig_tpidr2);78 td->pass = false;79 }80 }81 82 return 0;83}84 85struct tdescr tde = {86 .name = "TPIDR2",87 .descr = "Validate that TPIDR2 is present as expected",88 .timeout = 3,89 .run = tpidr2_present,90};91