1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2023 Arm Limited 4 * 5 * Verify that the POR_EL0 register context in signal frames is set up as 6 * 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 19 static union { 20 ucontext_t uc; 21 char buf[1024 * 128]; 22 } context; 23 24 int poe_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc) 25 { 26 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context); 27 struct poe_context *poe_ctx; 28 size_t offset; 29 bool in_sigframe; 30 bool have_poe; 31 __u64 orig_poe; 32 33 have_poe = getauxval(AT_HWCAP2) & HWCAP2_POE; 34 if (have_poe) 35 orig_poe = get_por_el0(); 36 37 if (!get_current_context(td, &context.uc, sizeof(context))) 38 return 1; 39 40 poe_ctx = (struct poe_context *) 41 get_header(head, POE_MAGIC, td->live_sz, &offset); 42 43 in_sigframe = poe_ctx != NULL; 44 45 fprintf(stderr, "POR_EL0 sigframe %s on system %s POE\n", 46 in_sigframe ? "present" : "absent", 47 have_poe ? "with" : "without"); 48 49 td->pass = (in_sigframe == have_poe); 50 51 /* 52 * Check that the value we read back was the one present at 53 * the time that the signal was triggered. 54 */ 55 if (have_poe && poe_ctx) { 56 if (poe_ctx->por_el0 != orig_poe) { 57 fprintf(stderr, "POR_EL0 in frame is %llx, was %llx\n", 58 poe_ctx->por_el0, orig_poe); 59 td->pass = false; 60 } 61 } 62 63 return 0; 64 } 65 66 struct tdescr tde = { 67 .name = "POR_EL0", 68 .descr = "Validate that POR_EL0 is present as expected", 69 .timeout = 3, 70 .run = poe_present, 71 }; 72