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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 : : #if defined(__s390__) && defined(__linux__) 36 : : # include <sys/user.h> 37 : : # include <sys/ptrace.h> 38 : : # include <asm/ptrace.h> 39 : : #endif 40 : : 41 : : #define BACKEND s390_ 42 : : #include "libebl_CPU.h" 43 : : 44 : : bool 45 : 0 : 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 : : #if !defined(__s390__) || !defined(__linux__) 50 : 0 : 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 : 24 : s390_normalize_pc (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr *pc) 90 : : { 91 [ - + ]: 24 : assert (ebl->class == ELFCLASS32); 92 : : 93 : : /* Clear S390 bit 31. */ 94 : 24 : *pc &= (1U << 31) - 1; 95 : 24 : }