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/* Target-dependent code for Solaris.
Copyright (C) 2006-2020 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "frame.h"
#include "symtab.h"
#include "inferior.h"
#include "objfiles.h"
#include "sol2-tdep.h"
/* The Solaris signal trampolines reside in libc. For normal signals,
the function `sigacthandler' is used. This signal trampoline will
call the signal handler using the System V calling convention,
where the third argument is a pointer to an instance of
`ucontext_t', which has a member `uc_mcontext' that contains the
saved registers. Incidentally, the kernel passes the `ucontext_t'
pointer as the third argument of the signal trampoline too, and
`sigacthandler' simply passes it on. However, if you link your
program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function
`ucbsigvechandler' will be used, which invokes the using the BSD
convention, where the third argument is a pointer to an instance of
`struct sigcontext'. It is the `ucbsigvechandler' function that
converts the `ucontext_t' to a `sigcontext', and back. Unless the
signal handler modifies the `struct sigcontext' we can safely
ignore this. */
static int
sol2_pc_in_sigtramp (CORE_ADDR pc, const char *name)
{
return (name && (strcmp (name, "sigacthandler") == 0
|| strcmp (name, "ucbsigvechandler") == 0
|| strcmp (name, "__sighndlr") == 0));
}
/* Return whether THIS_FRAME corresponds to a Solaris sigtramp routine. */
int
sol2_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
return sol2_pc_in_sigtramp (pc, name);
}
static CORE_ADDR
sol2_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
{
struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol("elf_bndr", NULL, NULL);
if (msym.minsym && BMSYMBOL_VALUE_ADDRESS (msym) == pc)
return frame_unwind_caller_pc (get_current_frame ());
return 0;
}
/* This is how we want PTIDs from Solaris core files to be printed. */
static std::string
sol2_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
{
struct inferior *inf;
int pid;
/* Check whether we're printing an LWP (gdb thread) or a process. */
pid = ptid.lwp ();
if (pid != 0)
{
/* A thread. */
return string_printf ("LWP %ld", ptid.lwp ());
}
/* GDB didn't use to put a NT_PSTATUS note in Solaris cores. If
that's missing, then we're dealing with a fake PID corelow.c made up. */
inf = find_inferior_ptid (current_inferior ()->process_target (), ptid);
if (inf == NULL || inf->fake_pid_p)
return "<core>";
/* Not fake; print as usual. */
return normal_pid_to_str (ptid);
}
/* To be called from GDB_OSABI_SOLARIS handlers. */
void
sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
/* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)
compiler puts out 0 instead of the address in N_SO stabs. Starting with
SunPRO 3.0, the compiler does this for N_FUN stabs too. */
set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
/* Solaris uses SVR4-style shared libraries. */
set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
/* How to print LWP PTIDs from core files. */
set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
}
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