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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.
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "arm-opcode.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; /* Original value discarded */
- {
- 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). */
-
- void
- 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, NULL);
- }
-
- 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");
- }
-