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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2023 Arm Limited4 *5 * Verify that the POR_EL0 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_POR_EL0 "S3_3_C10_C2_4"25 26static uint64_t get_por_el0(void)27{28 uint64_t val;29 30 asm volatile(31 "mrs %0, " SYS_POR_EL0 "\n"32 : "=r"(val)33 :34 : );35 36 return val;37}38 39int poe_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)40{41 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);42 struct poe_context *poe_ctx;43 size_t offset;44 bool in_sigframe;45 bool have_poe;46 __u64 orig_poe;47 48 have_poe = getauxval(AT_HWCAP2) & HWCAP2_POE;49 if (have_poe)50 orig_poe = get_por_el0();51 52 if (!get_current_context(td, &context.uc, sizeof(context)))53 return 1;54 55 poe_ctx = (struct poe_context *)56 get_header(head, POE_MAGIC, td->live_sz, &offset);57 58 in_sigframe = poe_ctx != NULL;59 60 fprintf(stderr, "POR_EL0 sigframe %s on system %s POE\n",61 in_sigframe ? "present" : "absent",62 have_poe ? "with" : "without");63 64 td->pass = (in_sigframe == have_poe);65 66 /*67 * Check that the value we read back was the one present at68 * the time that the signal was triggered.69 */70 if (have_poe && poe_ctx) {71 if (poe_ctx->por_el0 != orig_poe) {72 fprintf(stderr, "POR_EL0 in frame is %llx, was %llx\n",73 poe_ctx->por_el0, orig_poe);74 td->pass = false;75 }76 }77 78 return 0;79}80 81struct tdescr tde = {82 .name = "POR_EL0",83 .descr = "Validate that POR_EL0 is present as expected",84 .timeout = 3,85 .run = poe_present,86};87