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authorK. Richard Pixley <rich@cygnus>1991-03-28 16:28:29 +0000
committerK. Richard Pixley <rich@cygnus>1991-03-28 16:28:29 +0000
commitdd3b648e8b12ceb7bfce66e7f179b671403aea9c (patch)
tree91119a0f4943acc9293cd8baba06943621b6e6c7 /gdb/arm-xdep.c
parentbd5635a1e2b38ee8432fcdaa6456079191375277 (diff)
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Johns release
Diffstat (limited to 'gdb/arm-xdep.c')
-rw-r--r--gdb/arm-xdep.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/gdb/arm-xdep.c b/gdb/arm-xdep.c
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+/* Acorn Risc Machine host machine support.
+ Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+#include "arm-opcode.h"
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#define N_TXTADDR(hdr) 0x8000
+#define N_DATADDR(hdr) (hdr.a_text + 0x8000)
+
+#include "gdbcore.h"
+
+#include <sys/user.h> /* After a.out.h */
+#include <sys/file.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ register int regno;
+ register unsigned int regaddr;
+ char buf[MAX_REGISTER_RAW_SIZE];
+ register int i;
+
+ struct user u;
+ unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
+ offset = ptrace (PT_READ_U, inferior_pid, offset, 0) - KERNEL_U_ADDR;
+
+ registers_fetched ();
+
+ for (regno = 0; regno < 16; regno++)
+ {
+ regaddr = offset + regno * 4;
+ *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, regaddr, 0);
+ if (regno == PC_REGNUM)
+ *(int *)&buf[0] = GET_PC_PART(*(int *)&buf[0]);
+ supply_register (regno, buf);
+ }
+ *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, offset + PC*4);
+ supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */
+
+ /* read the floating point registers */
+ offset = (char *) &u.u_fp_regs - (char *)&u;
+ *(int *)buf = ptrace (PT_READ_U, inferior_pid, offset, 0);
+ supply_register (FPS_REGNUM, buf);
+ for (regno = 16; regno < 24; regno++) {
+ regaddr = offset + 4 + 12 * (regno - 16);
+ for (i = 0; i < 12; i += sizeof(int))
+ *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, regaddr + i, 0);
+ supply_register (regno, buf);
+ }
+}
+
+/* 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). */
+
+store_inferior_registers (regno)
+ int regno;
+{
+ register unsigned int regaddr;
+ char buf[80];
+
+ struct user u;
+ unsigned long value;
+ unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
+ offset = ptrace (PT_READ_U, inferior_pid, offset, 0) - KERNEL_U_ADDR;
+
+ if (regno >= 0) {
+ if (regno >= 16) return;
+ regaddr = offset + 4 * regno;
+ errno = 0;
+ value = read_register(regno);
+ if (regno == PC_REGNUM)
+ value = SET_PC_PART(read_register (PS_REGNUM), value);
+ ptrace (PT_WRITE_U, inferior_pid, regaddr, value);
+ if (errno != 0)
+ {
+ sprintf (buf, "writing register number %d", regno);
+ perror_with_name (buf);
+ }
+ }
+ else for (regno = 0; regno < 15; regno++)
+ {
+ regaddr = offset + regno * 4;
+ errno = 0;
+ value = read_register(regno);
+ if (regno == PC_REGNUM)
+ value = SET_PC_PART(read_register (PS_REGNUM), value);
+ ptrace (6, inferior_pid, regaddr, value);
+ if (errno != 0)
+ {
+ sprintf (buf, "writing all regs, number %d", regno);
+ perror_with_name (buf);
+ }
+ }
+}
+
+/* Work with core dump and executable files, for GDB.
+ This code would be in core.c if it weren't machine-dependent. */
+
+/* Structure to describe the chain of shared libraries used
+ by the execfile.
+ e.g. prog shares Xt which shares X11 which shares c. */
+
+struct shared_library {
+ struct exec_header header;
+ char name[SHLIBLEN];
+ CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */
+ long data_offset; /* offset of data section in file */
+ int chan; /* file descriptor for the file */
+ struct shared_library *shares; /* library this one shares */
+};
+static struct shared_library *shlib = 0;
+
+/* Hook for `exec_file_command' command to call. */
+
+extern void (*exec_file_display_hook) ();
+
+static CORE_ADDR unshared_text_start;
+
+/* extended header from exec file (for shared library info) */
+
+static struct exec_header exec_header;
+
+void
+core_file_command (filename, from_tty)
+ char *filename;
+ int from_tty;
+{
+ int val;
+ extern char registers[];
+
+ /* Discard all vestiges of any previous core file
+ and mark data and stack spaces as empty. */
+
+ if (corefile)
+ free (corefile);
+ corefile = 0;
+
+ if (corechan >= 0)
+ close (corechan);
+ corechan = -1;
+
+ data_start = 0;
+ data_end = 0;
+ stack_start = STACK_END_ADDR;
+ stack_end = STACK_END_ADDR;
+
+ /* Now, if a new core file was specified, open it and digest it. */
+
+ if (filename)
+ {
+ filename = tilde_expand (filename);
+ make_cleanup (free, filename);
+
+ if (have_inferior_p ())
+ error ("To look at a core file, you must kill the inferior with \"kill\".");
+ corechan = open (filename, O_RDONLY, 0);
+ if (corechan < 0)
+ perror_with_name (filename);
+ /* 4.2-style (and perhaps also sysV-style) core dump file. */
+ {
+ struct user u;
+
+ unsigned int reg_offset, fp_reg_offset;
+
+ val = myread (corechan, &u, sizeof u);
+ if (val < 0)
+ perror_with_name ("Not a core file: reading upage");
+ if (val != sizeof u)
+ error ("Not a core file: could only read %d bytes", val);
+
+ /* We are depending on exec_file_command having been called
+ previously to set exec_data_start. Since the executable
+ and the core file share the same text segment, the address
+ of the data segment will be the same in both. */
+ data_start = exec_data_start;
+
+ data_end = data_start + NBPG * u.u_dsize;
+ stack_start = stack_end - NBPG * u.u_ssize;
+ data_offset = NBPG * UPAGES;
+ stack_offset = NBPG * (UPAGES + u.u_dsize);
+
+ /* Some machines put an absolute address in here and some put
+ the offset in the upage of the regs. */
+ reg_offset = (int) u.u_ar0;
+ if (reg_offset > NBPG * UPAGES)
+ reg_offset -= KERNEL_U_ADDR;
+ fp_reg_offset = (char *) &u.u_fp_regs - (char *)&u;
+
+ /* I don't know where to find this info.
+ So, for now, mark it as not available. */
+ N_SET_MAGIC (core_aouthdr, 0);
+
+ /* Read the register values out of the core file and store
+ them where `read_register' will find them. */
+
+ {
+ register int regno;
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+
+ if (regno < 16)
+ val = lseek (corechan, reg_offset + 4 * regno, 0);
+ else if (regno < 24)
+ val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0);
+ else if (regno == 24)
+ val = lseek (corechan, fp_reg_offset, 0);
+ else if (regno == 25)
+ val = lseek (corechan, reg_offset + 4 * PC, 0);
+ if (val < 0
+ || (val = myread (corechan, buf, sizeof buf)) < 0)
+ {
+ char * buffer = (char *) alloca (strlen (reg_names[regno])
+ + 30);
+ strcpy (buffer, "Reading register ");
+ strcat (buffer, reg_names[regno]);
+
+ perror_with_name (buffer);
+ }
+
+ if (regno == PC_REGNUM)
+ *(int *)buf = GET_PC_PART(*(int *)buf);
+ supply_register (regno, buf);
+ }
+ }
+ }
+ if (filename[0] == '/')
+ corefile = savestring (filename, strlen (filename));
+ else
+ {
+ corefile = concat (current_directory, "/", filename);
+ }
+
+ set_current_frame ( create_new_frame (read_register (FP_REGNUM),
+ read_pc ()));
+ select_frame (get_current_frame (), 0);
+ validate_files ();
+ }
+ else if (from_tty)
+ printf ("No core file now.\n");
+}