1 /* Target-dependent code for Solaris. 2 3 Copyright (C) 2006-2020 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "frame.h" 22 #include "symtab.h" 23 #include "inferior.h" 24 #include "objfiles.h" 25 26 #include "sol2-tdep.h" 27 28 /* The Solaris signal trampolines reside in libc. For normal signals, 29 the function `sigacthandler' is used. This signal trampoline will 30 call the signal handler using the System V calling convention, 31 where the third argument is a pointer to an instance of 32 `ucontext_t', which has a member `uc_mcontext' that contains the 33 saved registers. Incidentally, the kernel passes the `ucontext_t' 34 pointer as the third argument of the signal trampoline too, and 35 `sigacthandler' simply passes it on. However, if you link your 36 program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function 37 `ucbsigvechandler' will be used, which invokes the using the BSD 38 convention, where the third argument is a pointer to an instance of 39 `struct sigcontext'. It is the `ucbsigvechandler' function that 40 converts the `ucontext_t' to a `sigcontext', and back. Unless the 41 signal handler modifies the `struct sigcontext' we can safely 42 ignore this. */ 43 44 static int 45 sol2_pc_in_sigtramp (CORE_ADDR pc, const char *name) 46 { 47 return (name && (strcmp (name, "sigacthandler") == 0 48 || strcmp (name, "ucbsigvechandler") == 0 49 || strcmp (name, "__sighndlr") == 0)); 50 } 51 52 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp routine. */ 53 54 int 55 sol2_sigtramp_p (struct frame_info *this_frame) 56 { 57 CORE_ADDR pc = get_frame_pc (this_frame); 58 const char *name; 59 60 find_pc_partial_function (pc, &name, NULL, NULL); 61 return sol2_pc_in_sigtramp (pc, name); 62 } 63 64 static CORE_ADDR 65 sol2_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) 66 { 67 struct bound_minimal_symbol msym; 68 69 msym = lookup_minimal_symbol("elf_bndr", NULL, NULL); 70 if (msym.minsym && BMSYMBOL_VALUE_ADDRESS (msym) == pc) 71 return frame_unwind_caller_pc (get_current_frame ()); 72 73 return 0; 74 } 75 76 /* This is how we want PTIDs from Solaris core files to be printed. */ 77 78 static std::string 79 sol2_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) 80 { 81 struct inferior *inf; 82 int pid; 83 84 /* Check whether we're printing an LWP (gdb thread) or a process. */ 85 pid = ptid.lwp (); 86 if (pid != 0) 87 { 88 /* A thread. */ 89 return string_printf ("LWP %ld", ptid.lwp ()); 90 } 91 92 /* GDB didn't use to put a NT_PSTATUS note in Solaris cores. If 93 that's missing, then we're dealing with a fake PID corelow.c made up. */ 94 inf = find_inferior_ptid (current_inferior ()->process_target (), ptid); 95 if (inf == NULL || inf->fake_pid_p) 96 return "<core>"; 97 98 /* Not fake; print as usual. */ 99 return normal_pid_to_str (ptid); 100 } 101 102 /* To be called from GDB_OSABI_SOLARIS handlers. */ 103 104 void 105 sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 106 { 107 /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO) 108 compiler puts out 0 instead of the address in N_SO stabs. Starting with 109 SunPRO 3.0, the compiler does this for N_FUN stabs too. */ 110 set_gdbarch_sofun_address_maybe_missing (gdbarch, 1); 111 112 /* Solaris uses SVR4-style shared libraries. */ 113 set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver); 114 115 /* How to print LWP PTIDs from core files. */ 116 set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str); 117 } 118