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[binutils-gdb.git] / gdb / sol2-tdep.c
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1 /* Target-dependent code for Solaris.
3 Copyright (C) 2006-2022 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #include "defs.h"
21 #include "frame.h"
22 #include "symtab.h"
23 #include "inferior.h"
24 #include "objfiles.h"
26 #include "sol2-tdep.h"
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. */
44 static int
45 sol2_pc_in_sigtramp (CORE_ADDR pc, const char *name)
47 return (name && (strcmp (name, "sigacthandler") == 0
48 || strcmp (name, "ucbsigvechandler") == 0
49 || strcmp (name, "__sighndlr") == 0));
52 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp routine. */
54 int
55 sol2_sigtramp_p (struct frame_info *this_frame)
57 CORE_ADDR pc = get_frame_pc (this_frame);
58 const char *name;
60 find_pc_partial_function (pc, &name, NULL, NULL);
61 return sol2_pc_in_sigtramp (pc, name);
64 static CORE_ADDR
65 sol2_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
67 struct bound_minimal_symbol msym;
69 msym = lookup_minimal_symbol("elf_bndr", NULL, NULL);
70 if (msym.minsym && msym.value_address () == pc)
71 return frame_unwind_caller_pc (get_current_frame ());
73 return 0;
76 /* This is how we want PTIDs from Solaris core files to be printed. */
78 static std::string
79 sol2_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
81 struct inferior *inf;
82 int pid;
84 /* Check whether we're printing an LWP (gdb thread) or a process. */
85 pid = ptid.lwp ();
86 if (pid != 0)
88 /* A thread. */
89 return string_printf ("LWP %ld", ptid.lwp ());
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>";
98 /* Not fake; print as usual. */
99 return normal_pid_to_str (ptid);
102 /* To be called from GDB_OSABI_SOLARIS handlers. */
104 void
105 sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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);
112 /* Solaris uses SVR4-style shared libraries. */
113 set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
115 /* How to print LWP PTIDs from core files. */
116 set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);