1 /* Fetch live process registers from TID. 2 Copyright (C) 2013 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 "system.h" 34 #include <assert.h> 35 #ifdef __s390__ 36 # include <sys/user.h> 37 # include <asm/ptrace.h> 38 # include <sys/ptrace.h> 39 #endif 40 41 #define BACKEND s390_ 42 #include "libebl_CPU.h" 43 44 bool 45 s390_set_initial_registers_tid (pid_t tid __attribute__ ((unused)), 46 ebl_tid_registers_t *setfunc __attribute__ ((unused)), 47 void *arg __attribute__ ((unused))) 48 { 49 #ifndef __s390__ 50 return false; 51 #else /* __s390__ */ 52 struct user user_regs; 53 ptrace_area parea; 54 parea.process_addr = (uintptr_t) &user_regs; 55 parea.kernel_addr = 0; 56 parea.len = sizeof (user_regs); 57 if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, NULL) != 0) 58 return false; 59 /* If we run as s390x we get the 64-bit registers of tid. 60 But -m31 executable seems to use only the 32-bit parts of its 61 registers so we ignore the upper half. */ 62 Dwarf_Word dwarf_regs[16]; 63 for (unsigned u = 0; u < 16; u++) 64 dwarf_regs[u] = user_regs.regs.gprs[u]; 65 if (! setfunc (0, 16, dwarf_regs, arg)) 66 return false; 67 /* Avoid conversion double -> integer. */ 68 eu_static_assert (sizeof user_regs.regs.fp_regs.fprs[0] 69 == sizeof dwarf_regs[0]); 70 for (unsigned u = 0; u < 16; u++) 71 { 72 // Store the double bits as is in the Dwarf_Word without conversion. 73 union 74 { 75 double d; 76 Dwarf_Word w; 77 } fpr = { .d = user_regs.regs.fp_regs.fprs[u] }; 78 dwarf_regs[u] = fpr.w; 79 } 80 81 if (! setfunc (16, 16, dwarf_regs, arg)) 82 return false; 83 dwarf_regs[0] = user_regs.regs.psw.addr; 84 return setfunc (-1, 1, dwarf_regs, arg); 85 #endif /* __s390__ */ 86 } 87 88 void 89 s390_normalize_pc (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr *pc) 90 { 91 assert (ebl->class == ELFCLASS32); 92 93 /* Clear S390 bit 31. */ 94 *pc &= (1U << 31) - 1; 95 } 96
