From: Jim Kingdon <jkingdon@engr.sgi.com>
Date: Fri, 27 Aug 1993 17:23:11 +0000 (+0000)
Subject: new for sun3 gdbserver
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7053c1a5e32e4f585ddbfe5f6c4cbae0bea306c5;p=binutils-gdb.git

new for sun3 gdbserver
---

diff --git a/gdb/gdbserver/low-sun3.c b/gdb/gdbserver/low-sun3.c
new file mode 100644
index 00000000000..eb578eee2eb
--- /dev/null
+++ b/gdb/gdbserver/low-sun3.c
@@ -0,0 +1,326 @@
+/* Low level interface to ptrace, for the remote server for GDB.
+   Copyright (C) 1986, 1987, 1993 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 "/usr/include/sys/wait.h"
+#include "frame.h"
+#include "inferior.h"
+/***************************
+#include "initialize.h"
+****************************/
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sgtty.h>
+#include <fcntl.h>
+
+/***************Begin MY defs*********************/
+int quit_flag = 0;
+char registers[REGISTER_BYTES];
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+
+char buf2[MAX_REGISTER_RAW_SIZE];
+/***************End MY defs*********************/
+
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+extern int sys_nerr;
+extern char **sys_errlist;
+extern char **environ;
+extern int errno;
+extern int inferior_pid;
+void error (), quit (), perror_with_name ();
+int query ();
+
+/* Start an inferior process and returns its pid.
+   ALLARGS is a vector of program-name and args.
+   ENV is the environment vector to pass.  */
+
+int
+create_inferior (program, allargs)
+     char *program;
+     char **allargs;
+{
+  int pid;
+
+  pid = fork ();
+  if (pid < 0)
+    perror_with_name ("fork");
+
+  if (pid == 0)
+    {
+      ptrace (PTRACE_TRACEME);
+
+      execv (program, allargs);
+
+      fprintf (stderr, "Cannot exec %s: %s.\n", program,
+	       errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+      fflush (stderr);
+      _exit (0177);
+    }
+
+  return pid;
+}
+
+/* Kill the inferior process.  Make us have no inferior.  */
+
+void
+kill_inferior ()
+{
+  if (inferior_pid == 0)
+    return;
+  ptrace (8, inferior_pid, 0, 0);
+  wait (0);
+  /*************inferior_died ();****VK**************/
+}
+
+/* Wait for process, returns status */
+
+unsigned char
+mywait (status)
+     char *status;
+{
+  int pid;
+  union wait w;
+
+  pid = wait (&w);
+  if (pid != inferior_pid)
+    perror_with_name ("wait");
+
+  if (WIFEXITED (w))
+    {
+      fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+      *status = 'E';
+      return ((unsigned char) WEXITSTATUS (w));
+    }
+  else if (!WIFSTOPPED (w))
+    {
+      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+      *status = 'T';
+      return ((unsigned char) WTERMSIG (w));
+    }
+
+  fetch_inferior_registers (0);
+
+  *status = 'S';
+  return ((unsigned char) WSTOPSIG (w));
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+myresume (step, signal)
+     int step;
+     int signal;
+{
+  errno = 0;
+  ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
+  if (errno)
+    perror_with_name ("ptrace");
+}
+
+/* Fetch one or more registers from the inferior.  REGNO == -1 to get
+   them all.  We actually fetch more than requested, when convenient,
+   marking them as valid so we won't fetch them again.  */
+
+void
+fetch_inferior_registers (ignored)
+     int ignored;
+{
+  struct regs inferior_registers;
+  struct fp_status inferior_fp_registers;
+  int i;
+
+  /* Global and Out regs are fetched directly, as well as the control
+     registers.  If we're getting one of the in or local regs,
+     and the stack pointer has not yet been fetched,
+     we have to do that first, since they're found in memory relative
+     to the stack pointer.  */
+
+  if (ptrace (PTRACE_GETREGS, inferior_pid,
+	      (PTRACE_ARG3_TYPE) &inferior_registers, 0))
+    perror("ptrace_getregs");
+      
+  registers[REGISTER_BYTE (0)] = 0;
+  memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
+	  15 * REGISTER_RAW_SIZE (G0_REGNUM));
+  *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; 
+  *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
+  *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
+  *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
+
+  /* Floating point registers */
+
+  if (ptrace (PTRACE_GETFPREGS, inferior_pid,
+	      (PTRACE_ARG3_TYPE) &inferior_fp_registers,
+	      0))
+    perror("ptrace_getfpregs");
+  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
+	  sizeof inferior_fp_registers.fpu_fr);
+
+  /* These regs are saved on the stack by the kernel.  Only read them
+     all (16 ptrace calls!) if we really need them.  */
+
+  read_inferior_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
+			&registers[REGISTER_BYTE (L0_REGNUM)],
+			16*REGISTER_RAW_SIZE (L0_REGNUM));
+}
+
+/* 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 (ignored)
+     int ignored;
+{
+  struct regs inferior_registers;
+  struct fp_status inferior_fp_registers;
+  CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
+
+  write_inferior_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
+			 16*REGISTER_RAW_SIZE (L0_REGNUM));
+
+  memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
+	  15 * REGISTER_RAW_SIZE (G1_REGNUM));
+
+  inferior_registers.r_ps =
+    *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
+  inferior_registers.r_pc =
+    *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
+  inferior_registers.r_npc =
+    *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
+  inferior_registers.r_y =
+    *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
+
+  if (ptrace (PTRACE_SETREGS, inferior_pid,
+	      (PTRACE_ARG3_TYPE) &inferior_registers, 0))
+    perror("ptrace_setregs");
+
+  memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
+	  sizeof inferior_fp_registers.fpu_fr);
+
+  if (ptrace (PTRACE_SETFPREGS, inferior_pid,
+	      (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
+    perror("ptrace_setfpregs");
+}
+
+/* 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.  */
+
+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));
+
+  /* Read all the longwords */
+  for (i = 0; i < count; i++, addr += sizeof (int))
+    {
+      buffer[i] = ptrace (1, inferior_pid, addr, 0);
+    }
+
+  /* Copy appropriate bytes out of the buffer.  */
+  bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), 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;
+{
+  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.  */
+
+  buffer[0] = ptrace (1, inferior_pid, addr, 0);
+
+  if (count > 1)
+    {
+      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;
+      ptrace (4, inferior_pid, addr, buffer[i]);
+      if (errno)
+	return errno;
+    }
+
+  return 0;
+}
+
+void
+initialize ()
+{
+  inferior_pid = 0;
+}
+
+int
+have_inferior_p ()
+{
+  return inferior_pid != 0;
+}