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1 : : /* Fetch live process registers from TID. 2 : : Copyright (C) 2023 OpenAnolis community LoongArch SIG. 3 : : Copyright (C) 2023 Loongson Technology Corporation Limted. 4 : : This file is part of elfutils. 5 : : 6 : : This file is free software; you can redistribute it and/or modify 7 : : it under the terms of either 8 : : 9 : : * the GNU Lesser General Public License as published by the Free 10 : : Software Foundation; either version 3 of the License, or (at 11 : : your option) any later version 12 : : 13 : : or 14 : : 15 : : * the GNU General Public License as published by the Free 16 : : Software Foundation; either version 2 of the License, or (at 17 : : your option) any later version 18 : : 19 : : or both in parallel, as here. 20 : : 21 : : elfutils is distributed in the hope that it will be useful, but 22 : : WITHOUT ANY WARRANTY; without even the implied warranty of 23 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 : : General Public License for more details. 25 : : 26 : : You should have received copies of the GNU General Public License and 27 : : the GNU Lesser General Public License along with this program. If 28 : : not, see <http://www.gnu.org/licenses/>. */ 29 : : 30 : : #ifdef HAVE_CONFIG_H 31 : : # include <config.h> 32 : : #endif 33 : : 34 : : #include "system.h" 35 : : #include <assert.h> 36 : : #if defined __loongarch__ && defined __linux__ 37 : : # include <sys/uio.h> 38 : : # include <sys/procfs.h> 39 : : # include <sys/ptrace.h> 40 : : #endif 41 : : 42 : : #define BACKEND loongarch_ 43 : : #include "libebl_CPU.h" 44 : : 45 : : bool 46 : 0 : loongarch_set_initial_registers_tid (pid_t tid __attribute__ ((unused)), 47 : : ebl_tid_registers_t *setfunc __attribute__ ((unused)), 48 : : void *arg __attribute__ ((unused))) 49 : : { 50 : : #if !defined __loongarch__ || !defined __linux__ 51 : 0 : return false; 52 : : #else /* __loongarch__ */ 53 : : 54 : : /* General registers. */ 55 : : struct user_regs_struct gregs; 56 : : struct iovec iovec; 57 : : iovec.iov_base = &gregs; 58 : : iovec.iov_len = sizeof (gregs); 59 : : if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0) 60 : : return false; 61 : : 62 : : /* $r0 is constant 0. */ 63 : : Dwarf_Word zero = 0; 64 : : if (! setfunc (0, 1, &zero, arg)) 65 : : return false; 66 : : 67 : : /* $r1-$r31. */ 68 : : if (! setfunc (1, 32, (Dwarf_Word *) &gregs.regs[1], arg)) 69 : : return false; 70 : : 71 : : /* PC. */ 72 : : if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.csr_era, arg)) 73 : : return false; 74 : : 75 : : /* Floating-point registers (only 64bits are used). */ 76 : : struct user_fp_struct fregs; 77 : : iovec.iov_base = &fregs; 78 : : iovec.iov_len = sizeof (fregs); 79 : : if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0) 80 : : return false; 81 : : 82 : : /* $f0-$f31 */ 83 : : if (! setfunc (32, 32, (Dwarf_Word *) &fregs.fpr[0], arg)) 84 : : return false; 85 : : 86 : : return true; 87 : : #endif /* __loongarch__ */ 88 : : }