+/* Low level interface to ptrace, for GDB when running under Unix.
+ Copyright (C) 1986, 1987, 1989 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 <stdio.h>
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+
+#define WOPR
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/ptrace.h>
+#include <sys/reg.h>
+#include <sys/trap.h>
+
+#include <a.out.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+
+extern int errno;
+\f
+/* This function simply calls ptrace with the given arguments.
+ It exists so that all calls to ptrace are isolated in this
+ machine-dependent file. */
+int
+ call_ptrace (request, pid, arg3, arg4)
+int request, pid, arg3, arg4;
+{
+ return ptrace (request, pid, arg3, arg4);
+}
+
+#ifdef ATTACH_DETACH
+
+extern int attach_flag ;
+
+/* Start debugging the process whose number is PID. */
+
+attach (pid)
+ int pid;
+{
+ errno = 0;
+ ptrace (PT_ATTACH, pid, 0, 0);
+ if (errno)
+ perror_with_name ("ptrace");
+ attach_flag = 1;
+ return pid;
+}
+
+/* Stop debugging the process whose number is PID
+ and continue it with signal number SIGNAL.
+ SIGNAL = 0 means just continue it. */
+
+void
+detach (signal)
+ int signal;
+{
+ errno = 0;
+ ptrace (PT_DETACH, inferior_pid, 1, signal);
+ if (errno)
+ perror_with_name ("ptrace");
+ attach_flag = 0;
+}
+#endif /* ATTACH_DETACH */
+
+kill_inferior ()
+{
+ if (remote_debugging)
+ return;
+ if (inferior_pid == 0)
+ return;
+ ptrace (8, inferior_pid, 0, 0);
+ wait (0);
+ inferior_died ();
+}
+
+/* This is used when GDB is exiting. It gives less chance of error.*/
+
+kill_inferior_fast ()
+{
+ if (remote_debugging)
+ return;
+ if (inferior_pid == 0)
+ return;
+ ptrace (8, inferior_pid, 0, 0);
+ wait (0);
+}
+
+/* Resume execution of the inferior process.
+ If STEP is nonzero, single-step it.
+ If SIGNAL is nonzero, give it that signal. */
+
+void
+ resume (step, signal)
+int step;
+int signal;
+{
+ errno = 0;
+ if (remote_debugging)
+ remote_resume (step, signal);
+ else
+ {
+ ptrace (step ? 9 : 7, inferior_pid, 1, signal);
+ if (errno)
+ perror_with_name ("ptrace");
+ }
+}
+\f
+#define INFERIOR_AR0(u) \
+ ((ptrace \
+ (PT_RUAREA, inferior_pid, ((char *) &u.u_ar0 - (char *) &u), 0)) \
+ - KERNEL_U_ADDR)
+
+static void
+ fetch_inferior_register (regno, regaddr)
+register int regno;
+register unsigned int regaddr;
+{
+#ifndef HPUX_VERSION_5
+ if (regno == PS_REGNUM)
+ {
+ union { int i; short s[2]; } ps_val;
+ int regval;
+
+ ps_val.i = (ptrace (PT_RUAREA, inferior_pid, regaddr, 0));
+ regval = ps_val.s[0];
+ supply_register (regno, ®val);
+ }
+ else
+#endif /* not HPUX_VERSION_5 */
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+ register int i;
+
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+ {
+ *(int *) &buf[i] = ptrace (PT_RUAREA, inferior_pid, regaddr, 0);
+ regaddr += sizeof (int);
+ }
+ supply_register (regno, buf);
+ }
+ return;
+}
+
+static void
+ store_inferior_register_1 (regno, regaddr, value)
+int regno;
+unsigned int regaddr;
+int value;
+{
+ errno = 0;
+ ptrace (PT_WUAREA, inferior_pid, regaddr, value);
+#if 0
+ /* HP-UX randomly sets errno to non-zero for regno == 25.
+ However, the value is correctly written, so ignore errno. */
+ if (errno != 0)
+ {
+ char string_buf[64];
+
+ sprintf (string_buf, "writing register number %d", regno);
+ perror_with_name (string_buf);
+ }
+#endif
+ return;
+}
+
+static void
+ store_inferior_register (regno, regaddr)
+register int regno;
+register unsigned int regaddr;
+{
+#ifndef HPUX_VERSION_5
+ if (regno == PS_REGNUM)
+ {
+ union { int i; short s[2]; } ps_val;
+
+ ps_val.i = (ptrace (PT_RUAREA, inferior_pid, regaddr, 0));
+ ps_val.s[0] = (read_register (regno));
+ store_inferior_register_1 (regno, regaddr, ps_val.i);
+ }
+ else
+#endif /* not HPUX_VERSION_5 */
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+ register int i;
+ extern char registers[];
+
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+ {
+ store_inferior_register_1
+ (regno, regaddr,
+ (*(int *) ®isters[(REGISTER_BYTE (regno)) + i]));
+ regaddr += sizeof (int);
+ }
+ }
+ return;
+}
+
+void
+ fetch_inferior_registers ()
+{
+ struct user u;
+ register int regno;
+ register unsigned int ar0_offset;
+ extern char registers[];
+
+ if (remote_debugging)
+ remote_fetch_registers (registers);
+ else
+ {
+ ar0_offset = (INFERIOR_AR0 (u));
+ for (regno = 0; (regno < FP0_REGNUM); regno++)
+ fetch_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
+ for (; (regno < NUM_REGS); regno++)
+ fetch_inferior_register (regno, (FP_REGISTER_ADDR (u, 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). */
+
+store_inferior_registers (regno)
+ register int regno;
+{
+ struct user u;
+ register unsigned int ar0_offset;
+ extern char registers[];
+
+ if (remote_debugging)
+ remote_store_registers (registers);
+ else
+ {
+ if (regno >= FP0_REGNUM)
+ {
+ store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
+ return;
+ }
+
+ ar0_offset = (INFERIOR_AR0 (u));
+ if (regno >= 0)
+ {
+ store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
+ return;
+ }
+
+ for (regno = 0; (regno < FP0_REGNUM); regno++)
+ store_inferior_register (regno, (REGISTER_ADDR (ar0_offset, regno)));
+ for (; (regno < NUM_REGS); regno++)
+ store_inferior_register (regno, (FP_REGISTER_ADDR (u, regno)));
+ }
+ return;
+}
+
+\f
+/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
+ in the NEW_SUN_PTRACE case.
+ It ought to be straightforward. But it appears that writing did
+ not write the data that I specified. I cannot understand where
+ it got the data that it actually did write. */
+
+/* Copy LEN bytes from inferior's memory starting at MEMADDR
+ to debugger memory starting at MYADDR.
+ On failure (cannot read from inferior, usually because address is out
+ of bounds) returns the value of errno. */
+
+int
+read_inferior_memory (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & - sizeof (int);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+ /* Allocate buffer of that many longwords. */
+ register int *buffer = (int *) alloca (count * sizeof (int));
+ extern int errno;
+
+ /* Read all the longwords */
+ for (i = 0; i < count; i++, addr += sizeof (int))
+ {
+ errno = 0;
+ if (remote_debugging)
+ buffer[i] = remote_fetch_word (addr);
+ else
+ buffer[i] = ptrace (1, inferior_pid, addr, 0);
+ if (errno)
+ return errno;
+ }
+
+ /* Copy appropriate bytes out of the buffer. */
+ bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
+ return 0;
+}
+
+/* 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;
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & - sizeof (int);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+ /* Allocate buffer of that many longwords. */
+ register int *buffer = (int *) alloca (count * sizeof (int));
+ extern int errno;
+
+ /* Fill start and end extra bytes of buffer with existing memory data. */
+
+ if (remote_debugging)
+ buffer[0] = remote_fetch_word (addr);
+ else
+ buffer[0] = ptrace (1, inferior_pid, addr, 0);
+
+ if (count > 1)
+ {
+ if (remote_debugging)
+ buffer[count - 1]
+ = remote_fetch_word (addr + (count - 1) * sizeof (int));
+ else
+ buffer[count - 1]
+ = ptrace (1, inferior_pid,
+ addr + (count - 1) * sizeof (int), 0);
+ }
+
+ /* Copy data to be written over corresponding part of buffer */
+
+ bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
+
+ /* Write the entire buffer. */
+
+ for (i = 0; i < count; i++, addr += sizeof (int))
+ {
+ errno = 0;
+ if (remote_debugging)
+ remote_store_word (addr, buffer[i]);
+ else
+ ptrace (4, inferior_pid, addr, buffer[i]);
+ if (errno)
+ return errno;
+ }
+
+ return 0;
+}
+\f
+/* Work with core dump and executable files, for GDB.
+ This code would be in core.c if it weren't machine-dependent. */
+
+/* This should probably be deleted. */
+/* Recognize COFF format systems because a.out.h defines AOUTHDR. */
+#ifdef AOUTHDR
+#define COFF_FORMAT
+#endif
+
+#ifdef HPUX_VERSION_5
+#define e_PS e_regs[PS]
+#define e_PC e_regs[PC]
+#endif /* HPUX_VERSION_5 */
+
+
+#ifndef N_TXTADDR
+#define N_TXTADDR(hdr) 0
+#endif /* no N_TXTADDR */
+
+#ifndef N_DATADDR
+#define N_DATADDR(hdr) hdr.a_text
+#endif /* no N_DATADDR */
+
+/* Make COFF and non-COFF names for things a little more compatible
+ to reduce conditionals later. */
+
+#ifdef COFF_FORMAT
+#define a_magic magic
+#endif
+
+#ifndef COFF_FORMAT
+#ifndef AOUTHDR
+#define AOUTHDR struct exec
+#endif
+#endif
+
+extern char *sys_siglist[];
+
+
+/* Hook for `exec_file_command' command to call. */
+
+extern void (*exec_file_display_hook) ();
+
+/* File names of core file and executable file. */
+
+extern char *corefile;
+extern char *execfile;
+
+/* Descriptors on which core file and executable file are open.
+ Note that the execchan is closed when an inferior is created
+ and reopened if the inferior dies or is killed. */
+
+extern int corechan;
+extern int execchan;
+
+/* Last modification time of executable file.
+ Also used in source.c to compare against mtime of a source file. */
+
+extern int exec_mtime;
+
+/* Virtual addresses of bounds of the two areas of memory in the core file. */
+
+extern CORE_ADDR data_start;
+extern CORE_ADDR data_end;
+extern CORE_ADDR stack_start;
+extern CORE_ADDR stack_end;
+
+/* Virtual addresses of bounds of two areas of memory in the exec file.
+ Note that the data area in the exec file is used only when there is no core file. */
+
+extern CORE_ADDR text_start;
+extern CORE_ADDR text_end;
+
+extern CORE_ADDR exec_data_start;
+extern CORE_ADDR exec_data_end;
+
+/* Address in executable file of start of text area data. */
+
+extern int text_offset;
+
+/* Address in executable file of start of data area data. */
+
+extern int exec_data_offset;
+
+/* Address in core file of start of data area data. */
+
+extern int data_offset;
+
+/* Address in core file of start of stack area data. */
+
+extern int stack_offset;
+
+#ifdef COFF_FORMAT
+/* various coff data structures */
+
+extern FILHDR file_hdr;
+extern SCNHDR text_hdr;
+extern SCNHDR data_hdr;
+
+#endif /* not COFF_FORMAT */
+
+/* a.out header saved in core file. */
+
+extern AOUTHDR core_aouthdr;
+
+/* a.out header of exec file. */
+
+extern AOUTHDR exec_aouthdr;
+
+extern void validate_files ();
+\f
+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;
+
+ int reg_offset;
+
+ val = myread (corechan, &u, sizeof u);
+ if (val < 0)
+ perror_with_name (filename);
+ 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);
+ reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
+
+ /* I don't know where to find this info.
+ So, for now, mark it as not available. */
+ core_aouthdr.a_magic = 0;
+
+ /* Read the register values out of the core file and store
+ them where `read_register' will find them. */
+
+ {
+ register int regno;
+ struct exception_stack es;
+ int val;
+
+ val = lseek (corechan, (REGISTER_ADDR (reg_offset, 0)), 0);
+ if (val < 0)
+ perror_with_name (filename);
+ val = myread (corechan, es,
+ ((char *) &es.e_offset - (char *) &es.e_regs[R0]));
+ if (val < 0)
+ perror_with_name (filename);
+ for (regno = 0; (regno < PS_REGNUM); regno++)
+ supply_register (regno, &es.e_regs[regno + R0]);
+ val = es.e_PS;
+ supply_register (regno++, &val);
+ supply_register (regno++, &es.e_PC);
+ for (; (regno < NUM_REGS); regno++)
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+
+ val = lseek (corechan, (FP_REGISTER_ADDR (u, regno)), 0);
+ if (val < 0)
+ perror_with_name (filename);
+
+ val = myread (corechan, buf, sizeof buf);
+ if (val < 0)
+ perror_with_name (filename);
+ 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");
+}
+\f
+exec_file_command (filename, from_tty)
+ char *filename;
+ int from_tty;
+{
+ int val;
+
+ /* Eliminate all traces of old exec file.
+ Mark text segment as empty. */
+
+ if (execfile)
+ free (execfile);
+ execfile = 0;
+ data_start = 0;
+ data_end -= exec_data_start;
+ text_start = 0;
+ text_end = 0;
+ exec_data_start = 0;
+ exec_data_end = 0;
+ if (execchan >= 0)
+ close (execchan);
+ execchan = -1;
+
+ /* Now open and digest the file the user requested, if any. */
+
+ if (filename)
+ {
+ filename = tilde_expand (filename);
+ make_cleanup (free, filename);
+
+ execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
+ &execfile);
+ if (execchan < 0)
+ perror_with_name (filename);
+
+#ifdef COFF_FORMAT
+ {
+ int aout_hdrsize;
+ int num_sections;
+
+ if (read_file_hdr (execchan, &file_hdr) < 0)
+ error ("\"%s\": not in executable format.", execfile);
+
+ aout_hdrsize = file_hdr.f_opthdr;
+ num_sections = file_hdr.f_nscns;
+
+ if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0)
+ error ("\"%s\": can't read optional aouthdr", execfile);
+
+ if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections,
+ aout_hdrsize) < 0)
+ error ("\"%s\": can't read text section header", execfile);
+
+ if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections,
+ aout_hdrsize) < 0)
+ error ("\"%s\": can't read data section header", execfile);
+
+ text_start = exec_aouthdr.text_start;
+ text_end = text_start + exec_aouthdr.tsize;
+ text_offset = text_hdr.s_scnptr;
+ exec_data_start = exec_aouthdr.data_start;
+ exec_data_end = exec_data_start + exec_aouthdr.dsize;
+ exec_data_offset = data_hdr.s_scnptr;
+ data_start = exec_data_start;
+ data_end += exec_data_start;
+ exec_mtime = file_hdr.f_timdat;
+ }
+#else /* not COFF_FORMAT */
+ {
+ struct stat st_exec;
+
+ val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR));
+
+ if (val < 0)
+ perror_with_name (filename);
+
+ text_start = N_TXTADDR (exec_aouthdr);
+ exec_data_start = N_DATADDR (exec_aouthdr);
+
+ text_offset = N_TXTOFF (exec_aouthdr);
+ exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
+
+ text_end = text_start + exec_aouthdr.a_text;
+ exec_data_end = exec_data_start + exec_aouthdr.a_data;
+ data_start = exec_data_start;
+ data_end += exec_data_start;
+
+ fstat (execchan, &st_exec);
+ exec_mtime = st_exec.st_mtime;
+ }
+#endif /* not COFF_FORMAT */
+
+ validate_files ();
+ }
+ else if (from_tty)
+ printf ("No exec file now.\n");
+
+ /* Tell display code (if any) about the changed file name. */
+ if (exec_file_display_hook)
+ (*exec_file_display_hook) (filename);
+}
+
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