/* Target-dependent code for HP-UX on PA-RISC.
- Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008
+ 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "solib-som.h"
#include "solib-pa64.h"
#include "regset.h"
+#include "regcache.h"
+#include "exceptions.h"
#include "gdb_string.h"
-#include <dl.h>
-#include <machine/save_state.h>
+#define IS_32BIT_TARGET(_gdbarch) \
+ ((gdbarch_tdep (_gdbarch))->bytes_per_address == 4)
+
+/* Bit in the `ss_flag' member of `struct save_state' that indicates
+ that the 64-bit register values are live. From
+ <machine/save_state.h>. */
+#define HPPA_HPUX_SS_WIDEREGS 0x40
+
+/* Offsets of various parts of `struct save_state'. From
+ <machine/save_state.h>. */
+#define HPPA_HPUX_SS_FLAGS_OFFSET 0
+#define HPPA_HPUX_SS_NARROW_OFFSET 4
+#define HPPA_HPUX_SS_FPBLOCK_OFFSET 256
+#define HPPA_HPUX_SS_WIDE_OFFSET 640
+
+/* The size of `struct save_state. */
+#define HPPA_HPUX_SAVE_STATE_SIZE 1152
+
+/* The size of `struct pa89_save_state', which corresponds to PA-RISC
+ 1.1, the lowest common denominator that we support. */
+#define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512
-#ifndef offsetof
-#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
-#endif
/* Forward declarations. */
extern void _initialize_hppa_hpux_tdep (void);
extern initialize_file_ftype _initialize_hppa_hpux_tdep;
-typedef struct
- {
- struct minimal_symbol *msym;
- CORE_ADDR solib_handle;
- CORE_ADDR return_val;
- }
-args_for_find_stub;
+static int
+in_opd_section (CORE_ADDR pc)
+{
+ struct obj_section *s;
+ int retval = 0;
+
+ s = find_pc_section (pc);
+
+ retval = (s != NULL
+ && s->the_bfd_section->name != NULL
+ && strcmp (s->the_bfd_section->name, ".opd") == 0);
+ return (retval);
+}
/* Return one if PC is in the call path of a trampoline, else return zero.
}
/* Should never happen. */
- warning ("Unable to find branch in parameter relocation stub.\n");
+ warning (_("Unable to find branch in parameter relocation stub."));
return 0;
}
}
/* Should never happen. */
- warning ("Unable to find branch in parameter relocation stub.\n");
+ warning (_("Unable to find branch in parameter relocation stub."));
return 0;
}
used in dynamic executables. */
static CORE_ADDR
-hppa_hpux_skip_trampoline_code (CORE_ADDR pc)
+hppa_hpux_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
long orig_pc = pc;
long prev_inst, curr_inst, loc;
struct minimal_symbol *msym;
of the function. So we may have to do something special. */
if (pc == hppa_symbol_address("$$dyncall"))
{
- pc = (CORE_ADDR) read_register (22);
+ pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
/* If bit 30 (counting from the left) is on, then pc is the address of
the PLT entry for this function, not the address of the function
itself. Bit 31 has meaning too, but only for MPE. */
if (pc & 0x2)
- pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
+ pc = (CORE_ADDR) read_memory_integer
+ (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
}
if (pc == hppa_symbol_address("$$dyncall_external"))
{
- pc = (CORE_ADDR) read_register (22);
- pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
+ pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
+ pc = (CORE_ADDR) read_memory_integer
+ (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
}
else if (pc == hppa_symbol_address("_sr4export"))
- pc = (CORE_ADDR) (read_register (22));
+ pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
/* Get the unwind descriptor corresponding to PC, return zero
if no unwind was found. */
/* Make sure we haven't walked outside the range of this stub. */
if (u != find_unwind_entry (loc))
{
- warning ("Unable to find branch in linker stub");
+ warning (_("Unable to find branch in linker stub"));
return orig_pc == pc ? 0 : pc & ~0x3;
}
return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3;
else
{
- warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
+ warning (_("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."));
return orig_pc == pc ? 0 : pc & ~0x3;
}
}
stubsym = lookup_minimal_symbol_by_pc (loc);
if (stubsym == NULL)
{
- warning ("Unable to find symbol for 0x%lx", loc);
+ warning (_("Unable to find symbol for 0x%lx"), loc);
return orig_pc == pc ? 0 : pc & ~0x3;
}
libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL);
if (libsym == NULL)
{
- warning ("Unable to find library symbol for %s\n",
+ warning (_("Unable to find library symbol for %s."),
DEPRECATED_SYMBOL_NAME (stubsym));
return orig_pc == pc ? 0 : pc & ~0x3;
}
/* Yup. See if the previous instruction loaded
rp from sp - 8. */
if (prev_inst == 0x4bc23ff1)
- return (read_memory_integer
- (read_register (HPPA_SP_REGNUM) - 8, 4)) & ~0x3;
+ {
+ CORE_ADDR sp;
+ sp = get_frame_register_unsigned (frame, HPPA_SP_REGNUM);
+ return read_memory_integer (sp - 8, 4) & ~0x3;
+ }
else
{
- warning ("Unable to find restore of %%rp before bv (%%rp).");
+ warning (_("Unable to find restore of %%rp before bv (%%rp)."));
return orig_pc == pc ? 0 : pc & ~0x3;
}
}
else if ((curr_inst & 0xffe0f000) == 0xe840d000)
{
return (read_memory_integer
- (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
+ (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
+ gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
}
/* What about be,n 0(sr0,%rp)? It's just another way we return to
I guess we could check for the previous instruction being
mtsp %r1,%sr0 if we want to do sanity checking. */
return (read_memory_integer
- (read_register (HPPA_SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
+ (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
+ gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
}
/* Haven't found the branch yet, but we're still in the stub.
}
}
-void
-hppa_skip_permanent_breakpoint (void)
+static void
+hppa_skip_permanent_breakpoint (struct regcache *regcache)
{
/* To step over a breakpoint instruction on the PA takes some
fiddling with the instruction address queue.
front to the back. But what do we put in the back? What
instruction comes after that one? Because of the branch delay
slot, the next insn is always at the back + 4. */
- write_register (HPPA_PCOQ_HEAD_REGNUM, read_register (HPPA_PCOQ_TAIL_REGNUM));
- write_register (HPPA_PCSQ_HEAD_REGNUM, read_register (HPPA_PCSQ_TAIL_REGNUM));
-
- write_register (HPPA_PCOQ_TAIL_REGNUM, read_register (HPPA_PCOQ_TAIL_REGNUM) + 4);
- /* We can leave the tail's space the same, since there's no jump. */
-}
-
-/* Exception handling support for the HP-UX ANSI C++ compiler.
- The compiler (aCC) provides a callback for exception events;
- GDB can set a breakpoint on this callback and find out what
- exception event has occurred. */
-
-/* The name of the hook to be set to point to the callback function */
-static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook";
-/* The name of the function to be used to set the hook value */
-static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value";
-/* The name of the callback function in end.o */
-static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback";
-/* Name of function in end.o on which a break is set (called by above) */
-static char HP_ACC_EH_break[] = "__d_eh_break";
-/* Name of flag (in end.o) that enables catching throws */
-static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw";
-/* Name of flag (in end.o) that enables catching catching */
-static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch";
-/* The enum used by aCC */
-typedef enum
- {
- __EH_NOTIFY_THROW,
- __EH_NOTIFY_CATCH
- }
-__eh_notification;
-
-/* Is exception-handling support available with this executable? */
-static int hp_cxx_exception_support = 0;
-/* Has the initialize function been run? */
-static int hp_cxx_exception_support_initialized = 0;
-/* Address of __eh_notify_hook */
-static CORE_ADDR eh_notify_hook_addr = 0;
-/* Address of __d_eh_notify_callback */
-static CORE_ADDR eh_notify_callback_addr = 0;
-/* Address of __d_eh_break */
-static CORE_ADDR eh_break_addr = 0;
-/* Address of __d_eh_catch_catch */
-static CORE_ADDR eh_catch_catch_addr = 0;
-/* Address of __d_eh_catch_throw */
-static CORE_ADDR eh_catch_throw_addr = 0;
-/* Sal for __d_eh_break */
-static struct symtab_and_line *break_callback_sal = 0;
-
-/* Code in end.c expects __d_pid to be set in the inferior,
- otherwise __d_eh_notify_callback doesn't bother to call
- __d_eh_break! So we poke the pid into this symbol
- ourselves.
- 0 => success
- 1 => failure */
-int
-setup_d_pid_in_inferior (void)
-{
- CORE_ADDR anaddr;
- struct minimal_symbol *msymbol;
- char buf[4]; /* FIXME 32x64? */
-
- /* Slam the pid of the process into __d_pid; failing is only a warning! */
- msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
- if (msymbol == NULL)
- {
- warning ("Unable to find __d_pid symbol in object file.");
- warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
- return 1;
- }
-
- anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
- store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */
- if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */
- {
- warning ("Unable to write __d_pid");
- warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
- return 1;
- }
- return 0;
-}
-
-/* elz: Used to lookup a symbol in the shared libraries.
- This function calls shl_findsym, indirectly through a
- call to __d_shl_get. __d_shl_get is in end.c, which is always
- linked in by the hp compilers/linkers.
- The call to shl_findsym cannot be made directly because it needs
- to be active in target address space.
- inputs: - minimal symbol pointer for the function we want to look up
- - address in target space of the descriptor for the library
- where we want to look the symbol up.
- This address is retrieved using the
- som_solib_get_solib_by_pc function (somsolib.c).
- output: - real address in the library of the function.
- note: the handle can be null, in which case shl_findsym will look for
- the symbol in all the loaded shared libraries.
- files to look at if you need reference on this stuff:
- dld.c, dld_shl_findsym.c
- end.c
- man entry for shl_findsym */
-
-CORE_ADDR
-find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle)
-{
- struct symbol *get_sym, *symbol2;
- struct minimal_symbol *buff_minsym, *msymbol;
- struct type *ftype;
- struct value **args;
- struct value *funcval;
- struct value *val;
-
- int x, namelen, err_value, tmp = -1;
- CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr;
- CORE_ADDR stub_addr;
-
-
- args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */
- funcval = find_function_in_inferior ("__d_shl_get");
- get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_DOMAIN, NULL, NULL);
- buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL);
- msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL);
- symbol2 = lookup_symbol ("__shldp", NULL, VAR_DOMAIN, NULL, NULL);
- endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym);
- namelen = strlen (DEPRECATED_SYMBOL_NAME (function));
- value_return_addr = endo_buff_addr + namelen;
- ftype = check_typedef (SYMBOL_TYPE (get_sym));
-
- /* do alignment */
- if ((x = value_return_addr % 64) != 0)
- value_return_addr = value_return_addr + 64 - x;
-
- errno_return_addr = value_return_addr + 64;
-
-
- /* set up stuff needed by __d_shl_get in buffer in end.o */
-
- target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen);
-
- target_write_memory (value_return_addr, (char *) &tmp, 4);
-
- target_write_memory (errno_return_addr, (char *) &tmp, 4);
-
- target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
- (char *) &handle, 4);
-
- /* now prepare the arguments for the call */
-
- args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12);
- args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol));
- args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr);
- args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE);
- args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr);
- args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr);
-
- /* now call the function */
-
- val = call_function_by_hand (funcval, 6, args);
-
- /* now get the results */
-
- target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value));
-
- target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr));
- if (stub_addr <= 0)
- error ("call to __d_shl_get failed, error code is %d", err_value);
-
- return (stub_addr);
-}
-/* Cover routine for find_stub_with_shl_get to pass to catch_errors */
-static int
-cover_find_stub_with_shl_get (void *args_untyped)
-{
- args_for_find_stub *args = args_untyped;
- args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle);
- return 0;
-}
-
-/* Initialize exception catchpoint support by looking for the
- necessary hooks/callbacks in end.o, etc., and set the hook value to
- point to the required debug function
-
- Return 0 => failure
- 1 => success */
-
-static int
-initialize_hp_cxx_exception_support (void)
-{
- struct symtabs_and_lines sals;
- struct cleanup *old_chain;
- struct cleanup *canonical_strings_chain = NULL;
- int i;
- char *addr_start;
- char *addr_end = NULL;
- char **canonical = (char **) NULL;
- int thread = -1;
- struct symbol *sym = NULL;
- struct minimal_symbol *msym = NULL;
- struct objfile *objfile;
- asection *shlib_info;
+ ULONGEST pcoq_tail, pcsq_tail;
+ regcache_cooked_read_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, &pcoq_tail);
+ regcache_cooked_read_unsigned (regcache, HPPA_PCSQ_TAIL_REGNUM, &pcsq_tail);
- /* Detect and disallow recursion. On HP-UX with aCC, infinite
- recursion is a possibility because finding the hook for exception
- callbacks involves making a call in the inferior, which means
- re-inserting breakpoints which can re-invoke this code */
+ regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, pcoq_tail);
+ regcache_cooked_write_unsigned (regcache, HPPA_PCSQ_HEAD_REGNUM, pcsq_tail);
- static int recurse = 0;
- if (recurse > 0)
- {
- hp_cxx_exception_support_initialized = 0;
- deprecated_exception_support_initialized = 0;
- return 0;
- }
-
- hp_cxx_exception_support = 0;
-
- /* First check if we have seen any HP compiled objects; if not,
- it is very unlikely that HP's idiosyncratic callback mechanism
- for exception handling debug support will be available!
- This will percolate back up to breakpoint.c, where our callers
- will decide to try the g++ exception-handling support instead. */
- if (!deprecated_hp_som_som_object_present)
- return 0;
-
- /* We have a SOM executable with SOM debug info; find the hooks */
-
- /* First look for the notify hook provided by aCC runtime libs */
- /* If we find this symbol, we conclude that the executable must
- have HP aCC exception support built in. If this symbol is not
- found, even though we're a HP SOM-SOM file, we may have been
- built with some other compiler (not aCC). This results percolates
- back up to our callers in breakpoint.c which can decide to
- try the g++ style of exception support instead.
- If this symbol is found but the other symbols we require are
- not found, there is something weird going on, and g++ support
- should *not* be tried as an alternative.
-
- ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
- ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
-
- /* libCsup has this hook; it'll usually be non-debuggable */
- msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL);
- if (msym)
- {
- eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym);
- hp_cxx_exception_support = 1;
- }
- else
- {
- warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook);
- warning ("Executable may not have been compiled debuggable with HP aCC.");
- warning ("GDB will be unable to intercept exception events.");
- eh_notify_hook_addr = 0;
- hp_cxx_exception_support = 0;
- return 0;
- }
-
- /* Next look for the notify callback routine in end.o */
- /* This is always available in the SOM symbol dictionary if end.o is linked in */
- msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL);
- if (msym)
- {
- eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym);
- hp_cxx_exception_support = 1;
- }
- else
- {
- warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback);
- warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
- warning ("GDB will be unable to intercept exception events.");
- eh_notify_callback_addr = 0;
- return 0;
- }
-
-#ifndef GDB_TARGET_IS_HPPA_20W
- /* Check whether the executable is dynamically linked or archive bound */
- /* With an archive-bound executable we can use the raw addresses we find
- for the callback function, etc. without modification. For an executable
- with shared libraries, we have to do more work to find the plabel, which
- can be the target of a call through $$dyncall from the aCC runtime support
- library (libCsup) which is linked shared by default by aCC. */
- /* This test below was copied from somsolib.c/somread.c. It may not be a very
- reliable one to test that an executable is linked shared. pai/1997-07-18 */
- shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
- if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0))
- {
- /* The minsym we have has the local code address, but that's not the
- plabel that can be used by an inter-load-module call. */
- /* Find solib handle for main image (which has end.o), and use that
- and the min sym as arguments to __d_shl_get() (which does the equivalent
- of shl_findsym()) to find the plabel. */
-
- args_for_find_stub args;
- static char message[] = "Error while finding exception callback hook:\n";
-
- args.solib_handle = gdbarch_tdep (current_gdbarch)->solib_get_solib_by_pc (eh_notify_callback_addr);
- args.msym = msym;
- args.return_val = 0;
-
- recurse++;
- catch_errors (cover_find_stub_with_shl_get, &args, message,
- RETURN_MASK_ALL);
- eh_notify_callback_addr = args.return_val;
- recurse--;
-
- deprecated_exception_catchpoints_are_fragile = 1;
-
- if (!eh_notify_callback_addr)
- {
- /* We can get here either if there is no plabel in the export list
- for the main image, or if something strange happened (?) */
- warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
- warning ("GDB will not be able to intercept exception events.");
- return 0;
- }
- }
- else
- deprecated_exception_catchpoints_are_fragile = 0;
-#endif
-
- /* Now, look for the breakpointable routine in end.o */
- /* This should also be available in the SOM symbol dict. if end.o linked in */
- msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL);
- if (msym)
- {
- eh_break_addr = SYMBOL_VALUE_ADDRESS (msym);
- hp_cxx_exception_support = 1;
- }
- else
- {
- warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break);
- warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
- warning ("GDB will be unable to intercept exception events.");
- eh_break_addr = 0;
- return 0;
- }
-
- /* Next look for the catch enable flag provided in end.o */
- sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
- VAR_DOMAIN, 0, (struct symtab **) NULL);
- if (sym) /* sometimes present in debug info */
- {
- eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym);
- hp_cxx_exception_support = 1;
- }
- else
- /* otherwise look in SOM symbol dict. */
- {
- msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL);
- if (msym)
- {
- eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym);
- hp_cxx_exception_support = 1;
- }
- else
- {
- warning ("Unable to enable interception of exception catches.");
- warning ("Executable may not have been compiled debuggable with HP aCC.");
- warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
- return 0;
- }
- }
-
- /* Next look for the catch enable flag provided end.o */
- sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
- VAR_DOMAIN, 0, (struct symtab **) NULL);
- if (sym) /* sometimes present in debug info */
- {
- eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym);
- hp_cxx_exception_support = 1;
- }
- else
- /* otherwise look in SOM symbol dict. */
- {
- msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL);
- if (msym)
- {
- eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym);
- hp_cxx_exception_support = 1;
- }
- else
- {
- warning ("Unable to enable interception of exception throws.");
- warning ("Executable may not have been compiled debuggable with HP aCC.");
- warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
- return 0;
- }
- }
-
- /* Set the flags */
- hp_cxx_exception_support = 2; /* everything worked so far */
- hp_cxx_exception_support_initialized = 1;
- deprecated_exception_support_initialized = 1;
-
- return 1;
-}
-
-/* Target operation for enabling or disabling interception of
- exception events.
- KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
- ENABLE is either 0 (disable) or 1 (enable).
- Return value is NULL if no support found;
- -1 if something went wrong,
- or a pointer to a symtab/line struct if the breakpointable
- address was found. */
-
-struct symtab_and_line *
-child_enable_exception_callback (enum exception_event_kind kind, int enable)
-{
- char buf[4];
-
- if (!deprecated_exception_support_initialized
- || !hp_cxx_exception_support_initialized)
- if (!initialize_hp_cxx_exception_support ())
- return NULL;
-
- switch (hp_cxx_exception_support)
- {
- case 0:
- /* Assuming no HP support at all */
- return NULL;
- case 1:
- /* HP support should be present, but something went wrong */
- return (struct symtab_and_line *) -1; /* yuck! */
- /* there may be other cases in the future */
- }
-
- /* Set the EH hook to point to the callback routine */
- store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */
- /* pai: (temp) FIXME should there be a pack operation first? */
- if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */
- {
- warning ("Could not write to target memory for exception event callback.");
- warning ("Interception of exception events may not work.");
- return (struct symtab_and_line *) -1;
- }
- if (enable)
- {
- /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
- if (PIDGET (inferior_ptid) > 0)
- {
- if (setup_d_pid_in_inferior ())
- return (struct symtab_and_line *) -1;
- }
- else
- {
- warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
- return (struct symtab_and_line *) -1;
- }
- }
-
- switch (kind)
- {
- case EX_EVENT_THROW:
- store_unsigned_integer (buf, 4, enable ? 1 : 0);
- if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */
- {
- warning ("Couldn't enable exception throw interception.");
- return (struct symtab_and_line *) -1;
- }
- break;
- case EX_EVENT_CATCH:
- store_unsigned_integer (buf, 4, enable ? 1 : 0);
- if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */
- {
- warning ("Couldn't enable exception catch interception.");
- return (struct symtab_and_line *) -1;
- }
- break;
- default:
- error ("Request to enable unknown or unsupported exception event.");
- }
-
- /* Copy break address into new sal struct, malloc'ing if needed. */
- if (!break_callback_sal)
- break_callback_sal = XMALLOC (struct symtab_and_line);
- init_sal (break_callback_sal);
- break_callback_sal->symtab = NULL;
- break_callback_sal->pc = eh_break_addr;
- break_callback_sal->line = 0;
- break_callback_sal->end = eh_break_addr;
-
- return break_callback_sal;
+ regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, pcoq_tail + 4);
+ /* We can leave the tail's space the same, since there's no jump. */
}
-/* Record some information about the current exception event */
-static struct exception_event_record current_ex_event;
-/* Convenience struct */
-static struct symtab_and_line null_symtab_and_line =
-{NULL, 0, 0, 0};
-
-/* Report current exception event. Returns a pointer to a record
- that describes the kind of the event, where it was thrown from,
- and where it will be caught. More information may be reported
- in the future */
-struct exception_event_record *
-child_get_current_exception_event (void)
-{
- CORE_ADDR event_kind;
- CORE_ADDR throw_addr;
- CORE_ADDR catch_addr;
- struct frame_info *fi, *curr_frame;
- int level = 1;
-
- curr_frame = get_current_frame ();
- if (!curr_frame)
- return (struct exception_event_record *) NULL;
-
- /* Go up one frame to __d_eh_notify_callback, because at the
- point when this code is executed, there's garbage in the
- arguments of __d_eh_break. */
- fi = find_relative_frame (curr_frame, &level);
- if (level != 0)
- return (struct exception_event_record *) NULL;
-
- select_frame (fi);
-
- /* Read in the arguments */
- /* __d_eh_notify_callback() is called with 3 arguments:
- 1. event kind catch or throw
- 2. the target address if known
- 3. a flag -- not sure what this is. pai/1997-07-17 */
- event_kind = read_register (HPPA_ARG0_REGNUM);
- catch_addr = read_register (HPPA_ARG1_REGNUM);
-
- /* Now go down to a user frame */
- /* For a throw, __d_eh_break is called by
- __d_eh_notify_callback which is called by
- __notify_throw which is called
- from user code.
- For a catch, __d_eh_break is called by
- __d_eh_notify_callback which is called by
- <stackwalking stuff> which is called by
- __throw__<stuff> or __rethrow_<stuff> which is called
- from user code. */
- /* FIXME: Don't use such magic numbers; search for the frames */
- level = (event_kind == EX_EVENT_THROW) ? 3 : 4;
- fi = find_relative_frame (curr_frame, &level);
- if (level != 0)
- return (struct exception_event_record *) NULL;
-
- select_frame (fi);
- throw_addr = get_frame_pc (fi);
-
- /* Go back to original (top) frame */
- select_frame (curr_frame);
-
- current_ex_event.kind = (enum exception_event_kind) event_kind;
- current_ex_event.throw_sal = find_pc_line (throw_addr, 1);
- current_ex_event.catch_sal = find_pc_line (catch_addr, 1);
-
- return ¤t_ex_event;
-}
/* Signal frames. */
struct hppa_hpux_sigtramp_unwind_cache
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
struct hppa_hpux_sigtramp_unwind_cache *info;
unsigned int flag;
- CORE_ADDR sp, scptr;
- int i, incr, off, szoff;
+ CORE_ADDR sp, scptr, off;
+ int i, incr, szoff;
if (*this_cache)
return *this_cache;
sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
- scptr = sp - 1352;
+ if (IS_32BIT_TARGET (gdbarch))
+ scptr = sp - 1352;
+ else
+ scptr = sp - 1520;
+
off = scptr;
/* See /usr/include/machine/save_state.h for the structure of the save_state_t
structure. */
- flag = read_memory_unsigned_integer(scptr, 4);
-
- if (!(flag & 0x40))
+ flag = read_memory_unsigned_integer(scptr + HPPA_HPUX_SS_FLAGS_OFFSET, 4);
+
+ if (!(flag & HPPA_HPUX_SS_WIDEREGS))
{
/* Narrow registers. */
- off = scptr + offsetof (save_state_t, ss_narrow);
+ off = scptr + HPPA_HPUX_SS_NARROW_OFFSET;
incr = 4;
szoff = 0;
}
else
{
/* Wide registers. */
- off = scptr + offsetof (save_state_t, ss_wide) + 8;
+ off = scptr + HPPA_HPUX_SS_WIDE_OFFSET + 8;
incr = 8;
szoff = (tdep->bytes_per_address == 4 ? 4 : 0);
}
{
if (hppa_hpux_tramp_reg[i] > 0)
info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff;
+
off += incr;
}
static void
hppa_hpux_sigtramp_frame_prev_register (struct frame_info *next_frame,
- void **this_prologue_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp,
- CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp,
+ CORE_ADDR *addrp,
+ int *realnump, gdb_byte *valuep)
{
struct hppa_hpux_sigtramp_unwind_cache *info
= hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
static const struct frame_unwind *
hppa_hpux_sigtramp_unwind_sniffer (struct frame_info *next_frame)
{
+ struct unwind_table_entry *u;
CORE_ADDR pc = frame_pc_unwind (next_frame);
- char *name;
- find_pc_partial_function (pc, &name, NULL, NULL);
+ u = find_unwind_entry (pc);
- if (name && strcmp(name, "_sigreturn") == 0)
+ /* If this is an export stub, try to get the unwind descriptor for
+ the actual function itself. */
+ if (u && u->stub_unwind.stub_type == EXPORT)
+ {
+ gdb_byte buf[HPPA_INSN_SIZE];
+ unsigned long insn;
+
+ if (!safe_frame_unwind_memory (next_frame, u->region_start,
+ buf, sizeof buf))
+ return NULL;
+
+ insn = extract_unsigned_integer (buf, sizeof buf);
+ if ((insn & 0xffe0e000) == 0xe8400000)
+ u = find_unwind_entry(u->region_start + hppa_extract_17 (insn) + 8);
+ }
+
+ if (u && u->HP_UX_interrupt_marker)
return &hppa_hpux_sigtramp_frame_unwind;
return NULL;
}
static CORE_ADDR
-hppa_hpux_som_find_global_pointer (struct value *function)
+hppa32_hpux_find_global_pointer (struct value *function)
{
CORE_ADDR faddr;
}
static CORE_ADDR
-hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
- CORE_ADDR funcaddr, int using_gcc,
- struct value **args, int nargs,
- struct type *value_type,
- CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
+hppa64_hpux_find_global_pointer (struct value *function)
{
- /* FIXME: tausq/2004-06-09: This needs much more testing. It is broken
- for pa64, but we should be able to get it to work with a little bit
- of work. gdb-6.1 has a lot of code to handle various cases; I've tried to
- simplify it and avoid compile-time conditionals. */
-
- /* On HPUX, functions in the main executable and in libraries can be located
- in different spaces. In order for us to be able to select the right
- space for the function call, we need to go through an instruction seqeunce
- to select the right space for the target function, call it, and then
- restore the space on return.
-
- There are two helper routines that can be used for this task -- if
- an application is linked with gcc, it will contain a __gcc_plt_call
- helper function. __gcc_plt_call, when passed the entry point of an
- import stub, will do the necessary space setting/restoration for the
- target function.
-
- For programs that are compiled/linked with the HP compiler, a similar
- function called __d_plt_call exists; __d_plt_call expects a PLABEL instead
- of an import stub as an argument.
-
- // *INDENT-OFF*
- To summarize, the call flow is:
- current function -> dummy frame -> __gcc_plt_call (import stub)
- -> target function
- or
- current function -> dummy frame -> __d_plt_call (plabel)
- -> target function
- // *INDENT-ON*
-
- In general the "funcaddr" argument passed to push_dummy_code is the actual
- entry point of the target function. For __gcc_plt_call, we need to
- locate the import stub for the corresponding function. Failing that,
- we construct a dummy "import stub" on the stack to pass as an argument.
- For __d_plt_call, we similarly synthesize a PLABEL on the stack to
- pass to the helper function.
-
- An additional twist is that, in order for us to restore the space register
- to its starting state, we need __gcc_plt_call/__d_plt_call to return
- to the instruction where we started the call. However, if we put
- the breakpoint there, gdb will complain because it will find two
- frames on the stack with the same (sp, pc) (with the dummy frame in
- between). Currently, we set the return pointer to (pc - 4) of the
- current function. FIXME: This is not an ideal solution; possibly if the
- current pc is at the beginning of a page, this will cause a page fault.
- Need to understand this better and figure out a better way to fix it. */
-
- struct minimal_symbol *sym;
-
- /* Nonzero if we will use GCC's PLT call routine. This routine must be
- passed an import stub, not a PLABEL. It is also necessary to get %r19
- before performing the call. (This is done by push_dummy_call.) */
- int use_gcc_plt_call = 1;
-
- /* See if __gcc_plt_call is available; if not we will use the HP version
- instead. */
- sym = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
- if (sym == NULL)
- use_gcc_plt_call = 0;
-
- /* If using __gcc_plt_call, we need to make sure we pass in an import
- stub. funcaddr can be pointing to an export stub or a real function,
- so we try to resolve it to the import stub. */
- if (use_gcc_plt_call)
+ CORE_ADDR faddr;
+ char buf[32];
+
+ faddr = value_as_address (function);
+
+ if (in_opd_section (faddr))
{
- struct objfile *objfile;
- struct minimal_symbol *funsym, *stubsym;
- CORE_ADDR stubaddr = 0;
+ target_read_memory (faddr, buf, sizeof (buf));
+ return extract_unsigned_integer (&buf[24], 8);
+ }
+ else
+ {
+ return gdbarch_tdep (current_gdbarch)->solib_get_got_by_pc (faddr);
+ }
+}
+
+static unsigned int ldsid_pattern[] = {
+ 0x000010a0, /* ldsid (rX),rY */
+ 0x00001820, /* mtsp rY,sr0 */
+ 0xe0000000 /* be,n (sr0,rX) */
+};
+
+static CORE_ADDR
+hppa_hpux_search_pattern (CORE_ADDR start, CORE_ADDR end,
+ unsigned int *patterns, int count)
+{
+ int num_insns = (end - start + HPPA_INSN_SIZE) / HPPA_INSN_SIZE;
+ unsigned int *insns;
+ gdb_byte *buf;
+ int offset, i;
- funsym = lookup_minimal_symbol_by_pc (funcaddr);
- if (!funsym)
- error ("Unable to find symbol for target function.\n");
+ buf = alloca (num_insns * HPPA_INSN_SIZE);
+ insns = alloca (num_insns * sizeof (unsigned int));
- ALL_OBJFILES (objfile)
+ read_memory (start, buf, num_insns * HPPA_INSN_SIZE);
+ for (i = 0; i < num_insns; i++, buf += HPPA_INSN_SIZE)
+ insns[i] = extract_unsigned_integer (buf, HPPA_INSN_SIZE);
+
+ for (offset = 0; offset <= num_insns - count; offset++)
+ {
+ for (i = 0; i < count; i++)
{
- stubsym = lookup_minimal_symbol_solib_trampoline
- (SYMBOL_LINKAGE_NAME (funsym), objfile);
+ if ((insns[offset + i] & patterns[i]) != patterns[i])
+ break;
+ }
+ if (i == count)
+ break;
+ }
- if (stubsym)
- {
- struct unwind_table_entry *u;
+ if (offset <= num_insns - count)
+ return start + offset * HPPA_INSN_SIZE;
+ else
+ return 0;
+}
+
+static CORE_ADDR
+hppa32_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
+ int *argreg)
+{
+ struct objfile *obj;
+ struct obj_section *sec;
+ struct hppa_objfile_private *priv;
+ struct frame_info *frame;
+ struct unwind_table_entry *u;
+ CORE_ADDR addr, rp;
+ char buf[4];
+ unsigned int insn;
- u = find_unwind_entry (SYMBOL_VALUE (stubsym));
- if (u == NULL
- || (u->stub_unwind.stub_type != IMPORT
- && u->stub_unwind.stub_type != IMPORT_SHLIB))
- continue;
+ sec = find_pc_section (pc);
+ obj = sec->objfile;
+ priv = objfile_data (obj, hppa_objfile_priv_data);
- stubaddr = SYMBOL_VALUE (stubsym);
+ if (!priv)
+ priv = hppa_init_objfile_priv_data (obj);
+ if (!priv)
+ error (_("Internal error creating objfile private data."));
- /* If we found an IMPORT stub, then we can stop searching;
- if we found an IMPORT_SHLIB, we want to continue the search
- in the hopes that we will find an IMPORT stub. */
- if (u->stub_unwind.stub_type == IMPORT)
- break;
+ /* Use the cached value if we have one. */
+ if (priv->dummy_call_sequence_addr != 0)
+ {
+ *argreg = priv->dummy_call_sequence_reg;
+ return priv->dummy_call_sequence_addr;
+ }
+
+ /* First try a heuristic; if we are in a shared library call, our return
+ pointer is likely to point at an export stub. */
+ frame = get_current_frame ();
+ rp = frame_unwind_register_unsigned (frame, 2);
+ u = find_unwind_entry (rp);
+ if (u && u->stub_unwind.stub_type == EXPORT)
+ {
+ addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
+ ldsid_pattern,
+ ARRAY_SIZE (ldsid_pattern));
+ if (addr)
+ goto found_pattern;
+ }
+
+ /* Next thing to try is to look for an export stub. */
+ if (priv->unwind_info)
+ {
+ int i;
+
+ for (i = 0; i < priv->unwind_info->last; i++)
+ {
+ struct unwind_table_entry *u;
+ u = &priv->unwind_info->table[i];
+ if (u->stub_unwind.stub_type == EXPORT)
+ {
+ addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
+ ldsid_pattern,
+ ARRAY_SIZE (ldsid_pattern));
+ if (addr)
+ {
+ goto found_pattern;
+ }
}
}
+ }
+
+ /* Finally, if this is the main executable, try to locate a sequence
+ from noshlibs */
+ addr = hppa_symbol_address ("noshlibs");
+ sec = find_pc_section (addr);
- if (stubaddr != 0)
+ if (sec && sec->objfile == obj)
+ {
+ CORE_ADDR start, end;
+
+ find_pc_partial_function (addr, NULL, &start, &end);
+ if (start != 0 && end != 0)
{
- /* Argument to __gcc_plt_call is passed in r22. */
- regcache_cooked_write_unsigned (current_regcache, 22, stubaddr);
+ addr = hppa_hpux_search_pattern (start, end, ldsid_pattern,
+ ARRAY_SIZE (ldsid_pattern));
+ if (addr)
+ goto found_pattern;
}
- else
+ }
+
+ /* Can't find a suitable sequence. */
+ return 0;
+
+found_pattern:
+ target_read_memory (addr, buf, sizeof (buf));
+ insn = extract_unsigned_integer (buf, sizeof (buf));
+ priv->dummy_call_sequence_addr = addr;
+ priv->dummy_call_sequence_reg = (insn >> 21) & 0x1f;
+
+ *argreg = priv->dummy_call_sequence_reg;
+ return priv->dummy_call_sequence_addr;
+}
+
+static CORE_ADDR
+hppa64_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
+ int *argreg)
+{
+ struct objfile *obj;
+ struct obj_section *sec;
+ struct hppa_objfile_private *priv;
+ CORE_ADDR addr;
+ struct minimal_symbol *msym;
+ int i;
+
+ sec = find_pc_section (pc);
+ obj = sec->objfile;
+ priv = objfile_data (obj, hppa_objfile_priv_data);
+
+ if (!priv)
+ priv = hppa_init_objfile_priv_data (obj);
+ if (!priv)
+ error (_("Internal error creating objfile private data."));
+
+ /* Use the cached value if we have one. */
+ if (priv->dummy_call_sequence_addr != 0)
+ {
+ *argreg = priv->dummy_call_sequence_reg;
+ return priv->dummy_call_sequence_addr;
+ }
+
+ /* FIXME: Without stub unwind information, locating a suitable sequence is
+ fairly difficult. For now, we implement a very naive and inefficient
+ scheme; try to read in blocks of code, and look for a "bve,n (rp)"
+ instruction. These are likely to occur at the end of functions, so
+ we only look at the last two instructions of each function. */
+ for (i = 0, msym = obj->msymbols; i < obj->minimal_symbol_count; i++, msym++)
+ {
+ CORE_ADDR begin, end;
+ char *name;
+ gdb_byte buf[2 * HPPA_INSN_SIZE];
+ int offset;
+
+ find_pc_partial_function (SYMBOL_VALUE_ADDRESS (msym), &name,
+ &begin, &end);
+
+ if (name == NULL || begin == 0 || end == 0)
+ continue;
+
+ if (target_read_memory (end - sizeof (buf), buf, sizeof (buf)) == 0)
{
- /* No import stub found; let's synthesize one. */
-
- /* ldsid %r21, %r1 */
- write_memory_unsigned_integer (sp, 4, 0x02a010a1);
- /* mtsp %r1,%sr0 */
- write_memory_unsigned_integer (sp + 4, 4, 0x00011820);
- /* be 0(%sr0, %r21) */
- write_memory_unsigned_integer (sp + 8, 4, 0xe2a00000);
- /* nop */
- write_memory_unsigned_integer (sp + 12, 4, 0x08000240);
-
- regcache_cooked_write_unsigned (current_regcache, 21, funcaddr);
- regcache_cooked_write_unsigned (current_regcache, 22, sp);
+ for (offset = 0; offset < sizeof (buf); offset++)
+ {
+ unsigned int insn;
+
+ insn = extract_unsigned_integer (buf + offset, HPPA_INSN_SIZE);
+ if (insn == 0xe840d002) /* bve,n (rp) */
+ {
+ addr = (end - sizeof (buf)) + offset;
+ goto found_pattern;
+ }
+ }
}
+ }
- /* We set the breakpoint address and r31 to (close to) where the current
- pc is; when __gcc_plt_call returns, it will restore pcsqh to the
- current value based on this. The -4 is needed for frame unwinding
- to work properly -- we need to land in a different function than
- the current function. */
- *bp_addr = (read_register (HPPA_PCOQ_HEAD_REGNUM) & ~3) - 4;
- regcache_cooked_write_unsigned (current_regcache, 31, *bp_addr);
+ /* Can't find a suitable sequence. */
+ return 0;
- /* Continue from __gcc_plt_call. */
- *real_pc = SYMBOL_VALUE (sym);
- }
- else
+found_pattern:
+ priv->dummy_call_sequence_addr = addr;
+ /* Right now we only look for a "bve,l (rp)" sequence, so the register is
+ always HPPA_RP_REGNUM. */
+ priv->dummy_call_sequence_reg = HPPA_RP_REGNUM;
+
+ *argreg = priv->dummy_call_sequence_reg;
+ return priv->dummy_call_sequence_addr;
+}
+
+static CORE_ADDR
+hppa_hpux_find_import_stub_for_addr (CORE_ADDR funcaddr)
+{
+ struct objfile *objfile;
+ struct minimal_symbol *funsym, *stubsym;
+ CORE_ADDR stubaddr;
+
+ funsym = lookup_minimal_symbol_by_pc (funcaddr);
+ stubaddr = 0;
+
+ ALL_OBJFILES (objfile)
{
- ULONGEST gp;
+ stubsym = lookup_minimal_symbol_solib_trampoline
+ (SYMBOL_LINKAGE_NAME (funsym), objfile);
- /* Use __d_plt_call as a fallback; __d_plt_call expects to be called
- with a plabel, so we need to build one. */
+ if (stubsym)
+ {
+ struct unwind_table_entry *u;
- sym = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
- if (sym == NULL)
- error("Can't find an address for __d_plt_call or __gcc_plt_call "
- "trampoline\nSuggest linking executable with -g or compiling "
- "with gcc.");
+ u = find_unwind_entry (SYMBOL_VALUE (stubsym));
+ if (u == NULL
+ || (u->stub_unwind.stub_type != IMPORT
+ && u->stub_unwind.stub_type != IMPORT_SHLIB))
+ continue;
- gp = gdbarch_tdep (gdbarch)->find_global_pointer (funcaddr);
- write_memory_unsigned_integer (sp, 4, funcaddr);
- write_memory_unsigned_integer (sp + 4, 4, gp);
+ stubaddr = SYMBOL_VALUE (stubsym);
- /* plabel is passed in r22 */
- regcache_cooked_write_unsigned (current_regcache, 22, sp);
+ /* If we found an IMPORT stub, then we can stop searching;
+ if we found an IMPORT_SHLIB, we want to continue the search
+ in the hopes that we will find an IMPORT stub. */
+ if (u->stub_unwind.stub_type == IMPORT)
+ break;
+ }
}
- /* Pushed one stack frame, which has to be 64-byte aligned. */
- sp += 64;
+ return stubaddr;
+}
- return sp;
+static int
+hppa_hpux_sr_for_addr (CORE_ADDR addr)
+{
+ int sr;
+ /* The space register to use is encoded in the top 2 bits of the address. */
+ sr = addr >> (gdbarch_tdep (current_gdbarch)->bytes_per_address * 8 - 2);
+ return sr + 4;
}
-\f
-/* Bit in the `ss_flag' member of `struct save_state' that indicates
- that the 64-bit register values are live. From
- <machine/save_state.h>. */
-#define HPPA_HPUX_SS_WIDEREGS 0x40
+static CORE_ADDR
+hppa_hpux_find_dummy_bpaddr (CORE_ADDR addr)
+{
+ /* In order for us to restore the space register to its starting state,
+ we need the dummy trampoline to return to the an instruction address in
+ the same space as where we started the call. We used to place the
+ breakpoint near the current pc, however, this breaks nested dummy calls
+ as the nested call will hit the breakpoint address and terminate
+ prematurely. Instead, we try to look for an address in the same space to
+ put the breakpoint.
+
+ This is similar in spirit to putting the breakpoint at the "entry point"
+ of an executable. */
+
+ struct obj_section *sec;
+ struct unwind_table_entry *u;
+ struct minimal_symbol *msym;
+ CORE_ADDR func;
+ int i;
-/* Offsets of various parts of `struct save_state'. From
- <machine/save_state.h>. */
-#define HPPA_HPUX_SS_FLAGS_OFFSET 0
-#define HPPA_HPUX_SS_NARROW_OFFSET 4
-#define HPPA_HPUX_SS_FPBLOCK_OFFSET 256
-#define HPPA_HPUX_SS_WIDE_OFFSET 640
+ sec = find_pc_section (addr);
+ if (sec)
+ {
+ /* First try the lowest address in the section; we can use it as long
+ as it is "regular" code (i.e. not a stub) */
+ u = find_unwind_entry (sec->addr);
+ if (!u || u->stub_unwind.stub_type == 0)
+ return sec->addr;
+
+ /* Otherwise, we need to find a symbol for a regular function. We
+ do this by walking the list of msymbols in the objfile. The symbol
+ we find should not be the same as the function that was passed in. */
+
+ /* FIXME: this is broken, because we can find a function that will be
+ called by the dummy call target function, which will still not
+ work. */
+
+ find_pc_partial_function (addr, NULL, &func, NULL);
+ for (i = 0, msym = sec->objfile->msymbols;
+ i < sec->objfile->minimal_symbol_count;
+ i++, msym++)
+ {
+ u = find_unwind_entry (SYMBOL_VALUE_ADDRESS (msym));
+ if (func != SYMBOL_VALUE_ADDRESS (msym)
+ && (!u || u->stub_unwind.stub_type == 0))
+ return SYMBOL_VALUE_ADDRESS (msym);
+ }
+ }
-/* The size of `struct save_state. */
-#define HPPA_HPUX_SAVE_STATE_SIZE 1152
+ warning (_("Cannot find suitable address to place dummy breakpoint; nested "
+ "calls may fail."));
+ return addr - 4;
+}
-/* The size of `struct pa89_save_state', which corresponds to PA-RISC
- 1.1, the lowest common denominator that we support. */
-#define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512
+static CORE_ADDR
+hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
+ CORE_ADDR funcaddr,
+ struct value **args, int nargs,
+ struct type *value_type,
+ CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
+ struct regcache *regcache)
+{
+ CORE_ADDR pc, stubaddr;
+ int argreg = 0;
+
+ pc = read_pc ();
+
+ /* Note: we don't want to pass a function descriptor here; push_dummy_call
+ fills in the PIC register for us. */
+ funcaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funcaddr, NULL);
+
+ /* The simple case is where we call a function in the same space that we are
+ currently in; in that case we don't really need to do anything. */
+ if (hppa_hpux_sr_for_addr (pc) == hppa_hpux_sr_for_addr (funcaddr))
+ {
+ /* Intraspace call. */
+ *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
+ *real_pc = funcaddr;
+ regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, *bp_addr);
+
+ return sp;
+ }
+
+ /* In order to make an interspace call, we need to go through a stub.
+ gcc supplies an appropriate stub called "__gcc_plt_call", however, if
+ an application is compiled with HP compilers then this stub is not
+ available. We used to fallback to "__d_plt_call", however that stub
+ is not entirely useful for us because it doesn't do an interspace
+ return back to the caller. Also, on hppa64-hpux, there is no
+ __gcc_plt_call available. In order to keep the code uniform, we
+ instead don't use either of these stubs, but instead write our own
+ onto the stack.
+
+ A problem arises since the stack is located in a different space than
+ code, so in order to branch to a stack stub, we will need to do an
+ interspace branch. Previous versions of gdb did this by modifying code
+ at the current pc and doing single-stepping to set the pcsq. Since this
+ is highly undesirable, we use a different scheme:
+
+ All we really need to do the branch to the stub is a short instruction
+ sequence like this:
+
+ PA1.1:
+ ldsid (rX),r1
+ mtsp r1,sr0
+ be,n (sr0,rX)
+
+ PA2.0:
+ bve,n (sr0,rX)
+
+ Instead of writing these sequences ourselves, we can find it in
+ the instruction stream that belongs to the current space. While this
+ seems difficult at first, we are actually guaranteed to find the sequences
+ in several places:
+
+ For 32-bit code:
+ - in export stubs for shared libraries
+ - in the "noshlibs" routine in the main module
+
+ For 64-bit code:
+ - at the end of each "regular" function
+
+ We cache the address of these sequences in the objfile's private data
+ since these operations can potentially be quite expensive.
+
+ So, what we do is:
+ - write a stack trampoline
+ - look for a suitable instruction sequence in the current space
+ - point the sequence at the trampoline
+ - set the return address of the trampoline to the current space
+ (see hppa_hpux_find_dummy_call_bpaddr)
+ - set the continuing address of the "dummy code" as the sequence.
+
+*/
+
+ if (IS_32BIT_TARGET (gdbarch))
+ {
+ static unsigned int hppa32_tramp[] = {
+ 0x0fdf1291, /* stw r31,-8(,sp) */
+ 0x02c010a1, /* ldsid (,r22),r1 */
+ 0x00011820, /* mtsp r1,sr0 */
+ 0xe6c00000, /* be,l 0(sr0,r22),%sr0,%r31 */
+ 0x081f0242, /* copy r31,rp */
+ 0x0fd11082, /* ldw -8(,sp),rp */
+ 0x004010a1, /* ldsid (,rp),r1 */
+ 0x00011820, /* mtsp r1,sr0 */
+ 0xe0400000, /* be 0(sr0,rp) */
+ 0x08000240 /* nop */
+ };
+
+ /* for hppa32, we must call the function through a stub so that on
+ return it can return to the space of our trampoline. */
+ stubaddr = hppa_hpux_find_import_stub_for_addr (funcaddr);
+ if (stubaddr == 0)
+ error (_("Cannot call external function not referenced by application "
+ "(no import stub).\n"));
+ regcache_cooked_write_unsigned (regcache, 22, stubaddr);
+
+ write_memory (sp, (char *)&hppa32_tramp, sizeof (hppa32_tramp));
+
+ *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
+ regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
+
+ *real_pc = hppa32_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
+ if (*real_pc == 0)
+ error (_("Cannot make interspace call from here."));
+
+ regcache_cooked_write_unsigned (regcache, argreg, sp);
+
+ sp += sizeof (hppa32_tramp);
+ }
+ else
+ {
+ static unsigned int hppa64_tramp[] = {
+ 0xeac0f000, /* bve,l (r22),%r2 */
+ 0x0fdf12d1, /* std r31,-8(,sp) */
+ 0x0fd110c2, /* ldd -8(,sp),rp */
+ 0xe840d002, /* bve,n (rp) */
+ 0x08000240 /* nop */
+ };
+
+ /* for hppa64, we don't need to call through a stub; all functions
+ return via a bve. */
+ regcache_cooked_write_unsigned (regcache, 22, funcaddr);
+ write_memory (sp, (char *)&hppa64_tramp, sizeof (hppa64_tramp));
+
+ *bp_addr = pc - 4;
+ regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
+
+ *real_pc = hppa64_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
+ if (*real_pc == 0)
+ error (_("Cannot make interspace call from here."));
+
+ regcache_cooked_write_unsigned (regcache, argreg, sp);
+
+ sp += sizeof (hppa64_tramp);
+ }
+
+ sp = gdbarch_frame_align (gdbarch, sp);
+
+ return sp;
+}
+
+\f
static void
hppa_hpux_supply_ss_narrow (struct regcache *regcache,
/* If the SS_WIDEREGS flag is set, we really do need the full
`struct save_state'. */
if (flags & HPPA_HPUX_SS_WIDEREGS && len < HPPA_HPUX_SAVE_STATE_SIZE)
- error ("Register set contents too small");
+ error (_("Register set contents too small"));
if (flags & HPPA_HPUX_SS_WIDEREGS)
hppa_hpux_supply_ss_wide (regcache, regnum, save_state);
#define HPPA_HPUX_SS_INSYSCALL 0x02
static CORE_ADDR
-hppa_hpux_read_pc (ptid_t ptid)
+hppa_hpux_read_pc (struct regcache *regcache)
{
ULONGEST flags;
/* If we're currently in a system call return the contents of %r31. */
- flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid);
+ regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
if (flags & HPPA_HPUX_SS_INSYSCALL)
- return read_register_pid (HPPA_R31_REGNUM, ptid) & ~0x3;
+ {
+ ULONGEST pc;
+ regcache_cooked_read_unsigned (regcache, HPPA_R31_REGNUM, &pc);
+ return pc & ~0x3;
+ }
- return hppa_read_pc (ptid);
+ return hppa_read_pc (regcache);
}
static void
-hppa_hpux_write_pc (CORE_ADDR pc, ptid_t ptid)
+hppa_hpux_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
ULONGEST flags;
/* If we're currently in a system call also write PC into %r31. */
- flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid);
+ regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
if (flags & HPPA_HPUX_SS_INSYSCALL)
- write_register_pid (HPPA_R31_REGNUM, pc | 0x3, ptid);
+ regcache_cooked_write_unsigned (regcache, HPPA_R31_REGNUM, pc | 0x3);
- return hppa_write_pc (pc, ptid);
+ return hppa_write_pc (regcache, pc);
}
static CORE_ADDR
}
\f
-static void
-hppa_hpux_inferior_created (struct target_ops *objfile, int from_tty)
-{
- /* Some HP-UX related globals to clear when a new "main"
- symbol file is loaded. HP-specific. */
- deprecated_hp_som_som_object_present = 0;
- hp_cxx_exception_support_initialized = 0;
-}
-
/* Given the current value of the pc, check to see if it is inside a stub, and
if so, change the value of the pc to point to the caller of the stub.
NEXT_FRAME is the next frame in the current list of frames.
hppa_hpux_unwind_adjust_stub (struct frame_info *next_frame, CORE_ADDR base,
struct trad_frame_saved_reg *saved_regs)
{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
int optimized, realreg;
enum lval_type lval;
CORE_ADDR addr;
u = find_unwind_entry (val);
if (u && u->stub_unwind.stub_type == EXPORT)
{
- stubpc = read_memory_integer (base - 24, TARGET_PTR_BIT / 8);
+ stubpc = read_memory_integer
+ (base - 24, gdbarch_ptr_bit (gdbarch) / 8);
trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
}
else if (hppa_symbol_address ("__gcc_plt_call")
== get_pc_function_start (val))
{
- stubpc = read_memory_integer (base - 8, TARGET_PTR_BIT / 8);
+ stubpc = read_memory_integer
+ (base - 8, gdbarch_ptr_bit (gdbarch) / 8);
trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
}
}
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (tdep->bytes_per_address == 4)
+ if (IS_32BIT_TARGET (gdbarch))
tdep->in_solib_call_trampoline = hppa32_hpux_in_solib_call_trampoline;
else
tdep->in_solib_call_trampoline = hppa64_hpux_in_solib_call_trampoline;
set_gdbarch_read_pc (gdbarch, hppa_hpux_read_pc);
set_gdbarch_write_pc (gdbarch, hppa_hpux_write_pc);
set_gdbarch_unwind_pc (gdbarch, hppa_hpux_unwind_pc);
+ set_gdbarch_skip_permanent_breakpoint
+ (gdbarch, hppa_skip_permanent_breakpoint);
set_gdbarch_regset_from_core_section
(gdbarch, hppa_hpux_regset_from_core_section);
frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer);
-
- observer_attach_inferior_created (hppa_hpux_inferior_created);
}
static void
tdep->is_elf = 0;
- tdep->find_global_pointer = hppa_hpux_som_find_global_pointer;
+ tdep->find_global_pointer = hppa32_hpux_find_global_pointer;
+
hppa_hpux_init_abi (info, gdbarch);
- som_solib_select (tdep);
+ som_solib_select (gdbarch);
}
static void
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->is_elf = 1;
+ tdep->find_global_pointer = hppa64_hpux_find_global_pointer;
+
hppa_hpux_init_abi (info, gdbarch);
- pa64_solib_select (tdep);
+ pa64_solib_select (gdbarch);
}
static enum gdb_osabi
{
if (strcmp (bfd_get_target (abfd), "hpux-core") == 0)
return GDB_OSABI_HPUX_SOM;
+ else if (strcmp (bfd_get_target (abfd), "elf64-hppa") == 0)
+ {
+ asection *section;
+
+ section = bfd_get_section_by_name (abfd, ".kernel");
+ if (section)
+ {
+ bfd_size_type size;
+ char *contents;
+
+ size = bfd_section_size (abfd, section);
+ contents = alloca (size);
+ if (bfd_get_section_contents (abfd, section, contents,
+ (file_ptr) 0, size)
+ && strcmp (contents, "HP-UX") == 0)
+ return GDB_OSABI_HPUX_ELF;
+ }
+ }
return GDB_OSABI_UNKNOWN;
}
gdbarch_register_osabi_sniffer (bfd_arch_unknown,
bfd_target_unknown_flavour,
hppa_hpux_core_osabi_sniffer);
+ gdbarch_register_osabi_sniffer (bfd_arch_hppa,
+ bfd_target_elf_flavour,
+ hppa_hpux_core_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM,
hppa_hpux_som_init_abi);
projects / deliverable / binutils-gdb.git / blobdiff