1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 #include <sys/param.h>
30 #include <sys/ioctl.h>
35 /***************Begin MY defs*********************/
37 char registers[REGISTER_BYTES];
39 /* Index within `registers' of the first byte of the space for
43 char buf2[MAX_REGISTER_RAW_SIZE];
44 /***************End MY defs*********************/
46 #include <sys/ptrace.h>
47 #include <machine/reg.h>
49 extern char **environ;
50 extern int inferior_pid;
51 void quit (), perror_with_name ();
54 /* Start an inferior process and returns its pid.
55 ALLARGS is a vector of program-name and args.
56 ENV is the environment vector to pass. */
59 create_inferior (program, allargs)
67 perror_with_name ("fork");
71 ptrace (PT_TRACE_ME, 0, 0, 0);
73 execv (program, allargs);
75 fprintf (stderr, "Cannot exec %s: %s.\n", program, strerror(errno));
83 /* Kill the inferior process. Make us have no inferior. */
88 if (inferior_pid == 0)
90 ptrace (PT_KILL, inferior_pid, 0, 0);
92 /*************inferior_died ();****VK**************/
95 /* Return nonzero if the given thread is still alive. */
103 /* Wait for process, returns status */
113 if (pid != inferior_pid)
114 perror_with_name ("wait");
118 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
120 return ((unsigned char) WEXITSTATUS (w));
122 else if (!WIFSTOPPED (w))
124 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
126 return ((unsigned char) WTERMSIG (w));
129 fetch_inferior_registers (0);
132 return ((unsigned char) WSTOPSIG (w));
135 /* Resume execution of the inferior process.
136 If STEP is nonzero, single-step it.
137 If SIGNAL is nonzero, give it that signal. */
140 myresume (step, signal)
145 ptrace (step ? PT_STEP : PT_CONTINUE, inferior_pid,
146 (PTRACE_ARG3_TYPE) 1, signal);
148 perror_with_name ("ptrace");
151 #if defined(__i386__)
153 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
154 /* symbols like 'tEAX' come from <machine/reg.h> */
155 static int tregmap[] =
157 tEAX, tECX, tEDX, tEBX,
158 tESP, tEBP, tESI, tEDI,
159 tEIP, tEFLAGS, tCS, tSS,
163 static struct save87 pcb_savefpu;
166 fetch_inferior_registers (regno)
169 struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
172 ptrace (PT_GETREGS, inferior_pid,
173 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
175 for (r = 0; r < NUM_REGS; r++)
176 memcpy (®isters[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4);
180 store_inferior_registers (regno)
183 struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
186 ptrace (PT_GETREGS, inferior_pid,
187 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
189 for (r = 0; r < NUM_REGS; r++)
190 memcpy (((int *)&inferior_registers) + tregmap[r], ®isters[REGISTER_BYTE (r)], 4);
192 ptrace (PT_SETREGS, inferior_pid,
193 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
196 #elif defined(__alpha__)
199 fetch_inferior_registers (regno)
202 struct reg regs; /* ptrace order, not gcc/gdb order */
206 ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
207 ptrace (PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
209 for (r = 0; r < 31; r++)
210 memcpy (®isters[REGISTER_BYTE (r)],
211 ®s.r_regs[r], sizeof(u_int64_t));
212 for (r = 0; r < 32; r++)
213 memcpy (®isters[REGISTER_BYTE (r + FP0_REGNUM)],
214 &fpregs.fpr_regs[r], sizeof(u_int64_t));
215 memcpy (®isters[REGISTER_BYTE (PC_REGNUM)],
216 ®s.r_regs[31], sizeof(u_int64_t));
218 memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, sizeof(u_int64_t));
219 memset (®isters[REGISTER_BYTE (FP_REGNUM)], 0, sizeof(u_int64_t));
223 store_inferior_registers (regno)
226 struct reg regs; /* ptrace order, not gcc/gdb order */
230 for (r = 0; r < 31; r++)
231 memcpy (®s.r_regs[r],
232 ®isters[REGISTER_BYTE (r)], sizeof(u_int64_t));
233 for (r = 0; r < 32; r++)
234 memcpy (&fpregs.fpr_regs[r],
235 ®isters[REGISTER_BYTE (r + FP0_REGNUM)], sizeof(u_int64_t));
236 memcpy (®s.r_regs[31],
237 ®isters[REGISTER_BYTE (PC_REGNUM)], sizeof(u_int64_t));
239 ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
240 ptrace (PT_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
246 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
247 in the NEW_SUN_PTRACE case.
248 It ought to be straightforward. But it appears that writing did
249 not write the data that I specified. I cannot understand where
250 it got the data that it actually did write. */
252 /* Copy LEN bytes from inferior's memory starting at MEMADDR
253 to debugger memory starting at MYADDR. */
255 read_inferior_memory (memaddr, myaddr, len)
261 /* Round starting address down to longword boundary. */
262 register CORE_ADDR addr = memaddr & -sizeof (int);
263 /* Round ending address up; get number of longwords that makes. */
265 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
266 /* Allocate buffer of that many longwords. */
267 register int *buffer = (int *) alloca (count * sizeof (int));
269 /* Read all the longwords */
270 for (i = 0; i < count; i++, addr += sizeof (int))
272 buffer[i] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
275 /* Copy appropriate bytes out of the buffer. */
276 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
279 /* Copy LEN bytes of data from debugger memory at MYADDR
280 to inferior's memory at MEMADDR.
281 On failure (cannot write the inferior)
282 returns the value of errno. */
285 write_inferior_memory (memaddr, myaddr, len)
291 /* Round starting address down to longword boundary. */
292 register CORE_ADDR addr = memaddr & -sizeof (int);
293 /* Round ending address up; get number of longwords that makes. */
295 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
296 /* Allocate buffer of that many longwords. */
297 register int *buffer = (int *) alloca (count * sizeof (int));
300 /* Fill start and end extra bytes of buffer with existing memory data. */
302 buffer[0] = ptrace (PT_READ_I, inferior_pid,
303 (PTRACE_ARG3_TYPE) addr, 0);
308 = ptrace (PT_READ_I, inferior_pid,
309 (PTRACE_ARG3_TYPE) addr + (count - 1) * sizeof (int), 0);
312 /* Copy data to be written over corresponding part of buffer */
314 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
316 /* Write the entire buffer. */
318 for (i = 0; i < count; i++, addr += sizeof (int))
321 ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
338 return inferior_pid != 0;