aboutsummaryrefslogtreecommitdiff
path: root/gdb/gdbserver/low-sim.c
diff options
context:
space:
mode:
authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/gdbserver/low-sim.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
downloadgdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.zip
gdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.tar.gz
gdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.tar.bz2
Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/gdbserver/low-sim.c')
-rw-r--r--gdb/gdbserver/low-sim.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/gdb/gdbserver/low-sim.c b/gdb/gdbserver/low-sim.c
new file mode 100644
index 0000000..8ad6e91
--- /dev/null
+++ b/gdb/gdbserver/low-sim.c
@@ -0,0 +1,289 @@
+/* Low level interface to simulators, for the remote server for GDB.
+ Copyright (C) 1995, 1996 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
+(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, 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"
+#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 */
+
+char registers[REGISTER_BYTES] __attribute__ ((aligned));
+
+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)
+ bfd *loadfile_bfd;
+{
+ asection *s;
+
+ for (s = loadfile_bfd->sections; s; s = s->next)
+ {
+ 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
+ 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,
+ (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",
+ (unsigned long)loadfile_bfd->start_address);
+
+ /* We were doing this in remote-mips.c, I suspect it is right
+ for other targets too. */
+ /* 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);
+ if (!abfd)
+ {
+ 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)
+ 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;
+{
+ 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
+
+ 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;
+{
+ sim_write (gdbsim_desc, memaddr, myaddr, len); /* should check for error. FIXME!! */
+ return 0;
+}
+
+#if 0
+void
+initialize ()
+{
+ inferior_pid = 0;
+}
+
+int
+have_inferior_p ()
+{
+ return inferior_pid != 0;
+}
+#endif