binutils-gdb/gdb/gdbserver/low-sim.c

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/* Low level interface to simulators, for the remote server for GDB.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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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
(at your option) any later version.
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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.
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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. */
#include "defs.h"
#include "bfd.h"
#include "server.h"
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#include "callback.h" /* GDB simulator callback interface */
#include "remote-sim.h" /* GDB simulator interface */
extern int remote_debug;
extern host_callback default_callback; /* in sim/common/callback.c */
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static char my_registers[REGISTER_BYTES] __attribute__ ((aligned));
char * registers = my_registers;
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int target_byte_order; /* used by simulator */
/* We record the result of sim_open so we can pass it
back to the other sim_foo routines. */
static SIM_DESC gdbsim_desc = 0;
/* This version of "load" should be usable for any simulator that
does not support loading itself. */
static void
generic_load (loadfile_bfd)
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bfd *loadfile_bfd;
{
asection *s;
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for (s = loadfile_bfd->sections; s; s = s->next)
{
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if (s->flags & SEC_LOAD)
{
bfd_size_type size;
size = bfd_get_section_size_before_reloc (s);
if (size > 0)
{
char *buffer;
bfd_vma lma; /* use load address, not virtual address */
buffer = xmalloc (size);
lma = s->lma;
/* Is this really necessary? I guess it gives the user something
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to look at during a long download. */
printf ("Loading section %s, size 0x%lx lma 0x%lx\n",
bfd_get_section_name (loadfile_bfd, s),
(unsigned long) size,
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(unsigned long) lma); /* chops high 32 bits. FIXME!! */
bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
write_inferior_memory (lma, buffer, size);
free (buffer);
}
}
}
printf ("Start address 0x%lx\n",
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(unsigned long) loadfile_bfd->start_address);
/* We were doing this in remote-mips.c, I suspect it is right
for other targets too. */
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/* write_pc (loadfile_bfd->start_address); *//* FIXME!! */
}
int
create_inferior (program, argv)
char *program;
char **argv;
{
bfd *abfd;
int pid = 0;
#ifdef TARGET_BYTE_ORDER_SELECTABLE
char **new_argv;
int nargs;
#endif
abfd = bfd_openr (program, 0);
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if (!abfd)
{
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fprintf (stderr, "gdbserver: can't open %s: %s\n",
program, bfd_errmsg (bfd_get_error ()));
exit (1);
}
if (!bfd_check_format (abfd, bfd_object))
{
fprintf (stderr, "gdbserver: unknown load format for %s: %s\n",
program, bfd_errmsg (bfd_get_error ()));
exit (1);
}
#ifdef TARGET_BYTE_ORDER_SELECTABLE
/* Add "-E big" or "-E little" to the argument list depending on the
endianness of the program to be loaded. */
for (nargs = 0; argv[nargs] != NULL; nargs++) /* count the args */
;
new_argv = alloca (sizeof (char *) * (nargs + 3)); /* allocate new args */
for (nargs = 0; argv[nargs] != NULL; nargs++) /* copy old to new */
new_argv[nargs] = argv[nargs];
new_argv[nargs] = "-E";
new_argv[nargs + 1] = bfd_big_endian (abfd) ? "big" : "little";
new_argv[nargs + 2] = NULL;
argv = new_argv;
#endif
/* Create an instance of the simulator. */
default_callback.init (&default_callback);
gdbsim_desc = sim_open (SIM_OPEN_STANDALONE, &default_callback, abfd, argv);
if (gdbsim_desc == 0)
exit (1);
/* Load the program into the simulator. */
if (abfd)
if (sim_load (gdbsim_desc, program, NULL, 0) == SIM_RC_FAIL)
generic_load (abfd);
/* Create an inferior process in the simulator. This initializes SP. */
sim_create_inferior (gdbsim_desc, abfd, argv, /* env */ NULL);
sim_resume (gdbsim_desc, 1, 0); /* execute one instr */
return pid;
}
/* Kill the inferior process. Make us have no inferior. */
void
kill_inferior ()
{
sim_close (gdbsim_desc, 0);
default_callback.shutdown (&default_callback);
}
/* Fetch one register. */
static void
fetch_register (regno)
int regno;
{
sim_fetch_register (gdbsim_desc, regno, &registers[REGISTER_BYTE (regno)],
REGISTER_RAW_SIZE (regno));
}
/* Fetch all registers, or just one, from the child process. */
void
fetch_inferior_registers (regno)
int regno;
{
if (regno == -1 || regno == 0)
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for (regno = 0; regno < NUM_REGS /*-NUM_FREGS*/ ; regno++)
fetch_register (regno);
else
fetch_register (regno);
}
/* Store our register values back into the inferior.
If REGNO is -1, do this for all registers.
Otherwise, REGNO specifies which register (so we can save time). */
void
store_inferior_registers (regno)
int regno;
{
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if (regno == -1)
{
for (regno = 0; regno < NUM_REGS; regno++)
store_inferior_registers (regno);
}
else
sim_store_register (gdbsim_desc, regno, &registers[REGISTER_BYTE (regno)],
REGISTER_RAW_SIZE (regno));
}
/* Return nonzero if the given thread is still alive. */
int
mythread_alive (pid)
int pid;
{
return 1;
}
/* Wait for process, returns status */
unsigned char
mywait (status)
char *status;
{
int sigrc;
enum sim_stop reason;
sim_stop_reason (gdbsim_desc, &reason, &sigrc);
switch (reason)
{
case sim_exited:
if (remote_debug)
printf ("\nChild exited with retcode = %x \n", sigrc);
*status = 'W';
return sigrc;
#if 0
case sim_stopped:
if (remote_debug)
printf ("\nChild terminated with signal = %x \n", sigrc);
*status = 'X';
return sigrc;
#endif
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default: /* should this be sim_signalled or sim_stopped? FIXME!! */
if (remote_debug)
printf ("\nChild received signal = %x \n", sigrc);
fetch_inferior_registers (0);
*status = 'T';
return (unsigned char) sigrc;
}
}
/* Resume execution of the inferior process.
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
void
myresume (step, signo)
int step;
int signo;
{
/* Should be using target_signal_to_host() or signal numbers in target.h
to convert GDB signal number to target signal number. */
sim_resume (gdbsim_desc, step, signo);
}
/* Copy LEN bytes from inferior's memory starting at MEMADDR
to debugger memory starting at MYADDR. */
void
read_inferior_memory (memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
int len;
{
sim_read (gdbsim_desc, memaddr, myaddr, len);
}
/* Copy LEN bytes of data from debugger memory at MYADDR
to inferior's memory at MEMADDR.
On failure (cannot write the inferior)
returns the value of errno. */
int
write_inferior_memory (memaddr, myaddr, len)
CORE_ADDR memaddr;
char *myaddr;
int len;
{
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sim_write (gdbsim_desc, memaddr, myaddr, len); /* should check for error. FIXME!! */
return 0;
}
void
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initialize_low ()
{
}