/* Target-dependent code for Solaris.
- Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2006-2022 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "frame.h"
#include "symtab.h"
+#include "inferior.h"
+#include "objfiles.h"
#include "sol2-tdep.h"
-CORE_ADDR
+/* 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 minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol("elf_bndr", NULL, NULL);
- if (msym && SYMBOL_VALUE_ADDRESS (msym) == pc)
- return frame_pc_unwind (get_current_frame ());
+ if (msym.minsym && msym.value_address () == 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);
+}