83 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2023 ARM Limited4 *5 * Verify that the FPMR 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_FPMR "S3_3_C4_C4_2"25 26static uint64_t get_fpmr(void)27{28 uint64_t val;29 30 asm volatile (31 "mrs %0, " SYS_FPMR "\n"32 : "=r"(val)33 :34 : "cc");35 36 return val;37}38 39int fpmr_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)40{41 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);42 struct fpmr_context *fpmr_ctx;43 size_t offset;44 bool in_sigframe;45 bool have_fpmr;46 __u64 orig_fpmr;47 48 have_fpmr = getauxval(AT_HWCAP2) & HWCAP2_FPMR;49 if (have_fpmr)50 orig_fpmr = get_fpmr();51 52 if (!get_current_context(td, &context.uc, sizeof(context)))53 return 1;54 55 fpmr_ctx = (struct fpmr_context *)56 get_header(head, FPMR_MAGIC, td->live_sz, &offset);57 58 in_sigframe = fpmr_ctx != NULL;59 60 fprintf(stderr, "FPMR sigframe %s on system %s FPMR\n",61 in_sigframe ? "present" : "absent",62 have_fpmr ? "with" : "without");63 64 td->pass = (in_sigframe == have_fpmr);65 66 if (have_fpmr && fpmr_ctx) {67 if (fpmr_ctx->fpmr != orig_fpmr) {68 fprintf(stderr, "FPMR in frame is %llx, was %llx\n",69 fpmr_ctx->fpmr, orig_fpmr);70 td->pass = false;71 }72 }73 74 return 0;75}76 77struct tdescr tde = {78 .name = "FPMR",79 .descr = "Validate that FPMR is present as expected",80 .timeout = 3,81 .run = fpmr_present,82};83