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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                 :            : }