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1 : : /* Populate process registers from a linux perf_events sample. 2 : : Copyright (C) 2025 Red Hat, Inc. 3 : : This file is part of elfutils. 4 : : 5 : : This file is free software; you can redistribute it and/or modify 6 : : it under the terms of either 7 : : 8 : : * the GNU Lesser General Public License as published by the Free 9 : : Software Foundation; either version 3 of the License, or (at 10 : : your option) any later version 11 : : 12 : : or 13 : : 14 : : * the GNU General Public License as published by the Free 15 : : Software Foundation; either version 2 of the License, or (at 16 : : your option) any later version 17 : : 18 : : or both in parallel, as here. 19 : : 20 : : elfutils is distributed in the hope that it will be useful, but 21 : : WITHOUT ANY WARRANTY; without even the implied warranty of 22 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 : : General Public License for more details. 24 : : 25 : : You should have received copies of the GNU General Public License and 26 : : the GNU Lesser General Public License along with this program. If 27 : : not, see <http://www.gnu.org/licenses/>. */ 28 : : 29 : : #ifdef HAVE_CONFIG_H 30 : : # include <config.h> 31 : : #endif 32 : : 33 : : #include <stdlib.h> 34 : : #if (defined __i386__ || defined __x86_64__) && defined(__linux__) 35 : : # include <linux/perf_event.h> 36 : : # include <asm/perf_regs.h> 37 : : #endif 38 : : 39 : : #define BACKEND i386_ 40 : : #include "libebl_CPU.h" 41 : : #include "libebl_PERF_FLAGS.h" 42 : : #if (defined __i386__ || defined __x86_64__) && defined(__linux__) 43 : : # include "linux-perf-regs.c" 44 : : # include "x86_initreg_sample.c" 45 : : #endif 46 : : 47 : : /* Register ordering cf. linux arch/x86/include/uapi/asm/perf_regs.h, 48 : : enum perf_event_x86_regs: */ 49 : : Dwarf_Word 50 : 0 : i386_sample_base_addr (const Dwarf_Word *regs, uint32_t n_regs, 51 : : uint64_t regs_mask, 52 : : /* XXX hypothetically needed if abi varies 53 : : between samples in the same process; 54 : : not needed on x86 */ 55 : : uint32_t abi __attribute__((unused))) 56 : : { 57 : : #if (!defined __i386__ && !defined __x86_64__) || !defined(__linux__) 58 : : (void)regs; 59 : : (void)n_regs; 60 : : (void)regs_mask; 61 : : return 0; 62 : : #else /* __i386__ || __x86_64__ */ 63 : 0 : (void)regs; 64 : 0 : (void)n_regs; 65 : 0 : (void)regs_mask; 66 : 0 : return perf_sample_find_reg (regs, n_regs, regs_mask, 67 : : 7 /* index into perf_event_x86_regs */); 68 : : #endif 69 : : } 70 : : 71 : : Dwarf_Word 72 : 0 : i386_sample_pc (const Dwarf_Word *regs, uint32_t n_regs, 73 : : uint64_t regs_mask, 74 : : uint32_t abi __attribute__((unused))) 75 : : { 76 : : #if (!defined __i386__ && !defined __x86_64__) || !defined(__linux__) 77 : : (void)regs; 78 : : (void)n_regs; 79 : : (void)regs_mask; 80 : : return 0; 81 : : #else /* __i386__ || __x86_64__ */ 82 : 0 : return perf_sample_find_reg (regs, n_regs, regs_mask, 83 : : 8 /* index into perf_event_x86_regs */); 84 : : #endif 85 : : } 86 : : 87 : : bool 88 : 0 : i386_set_initial_registers_sample (const Dwarf_Word *regs, uint32_t n_regs, 89 : : uint64_t regs_mask, uint32_t abi, 90 : : ebl_tid_registers_t *setfunc, 91 : : void *arg) 92 : : { 93 : : #if (!defined __i386__ && !defined __x86_64__) || !defined(__linux__) 94 : : (void)regs; 95 : : (void)n_regs; 96 : : (void)regs_mask; 97 : : (void)abi; 98 : : (void)setfunc; 99 : : (void)arg; 100 : : return false; 101 : : #else /* __i386__ || __x86_64__ */ 102 : 0 : Dwarf_Word dwarf_regs[9]; 103 [ # # ]: 0 : if (!x86_set_initial_registers_sample (regs, n_regs, regs_mask, 104 : : abi, dwarf_regs, 9)) 105 : : return false; 106 : 0 : return setfunc (0, 9, dwarf_regs, arg); 107 : : #endif 108 : : }