1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1986, 1987, 1993 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. */
21 #include "<sys/wait.h>"
26 #include <sys/param.h>
30 #include <sys/ioctl.h>
34 /***************Begin MY defs*********************/
36 char registers[REGISTER_BYTES];
38 /* Index within `registers' of the first byte of the space for
42 char buf2[MAX_REGISTER_RAW_SIZE];
43 /***************End MY defs*********************/
45 #include <sys/ptrace.h>
46 #include <machine/reg.h>
49 extern char **sys_errlist;
50 extern char **environ;
52 extern int inferior_pid;
53 void quit (), perror_with_name ();
56 /* Start an inferior process and returns its pid.
57 ALLARGS is a vector of program-name and args.
58 ENV is the environment vector to pass. */
61 create_inferior (program, allargs)
69 perror_with_name ("fork");
73 ptrace (PTRACE_TRACEME);
75 execv (program, allargs);
77 fprintf (stderr, "Cannot exec %s: %s.\n", program,
78 errno < sys_nerr ? sys_errlist[errno] : "unknown error");
86 /* Kill the inferior process. Make us have no inferior. */
91 if (inferior_pid == 0)
93 ptrace (8, inferior_pid, 0, 0);
95 /*************inferior_died ();****VK**************/
98 /* Return nonzero if the given thread is still alive. */
106 /* Wait for process, returns status */
116 if (pid != inferior_pid)
117 perror_with_name ("wait");
121 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
123 return ((unsigned char) WEXITSTATUS (w));
125 else if (!WIFSTOPPED (w))
127 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
129 return ((unsigned char) WTERMSIG (w));
132 fetch_inferior_registers (0);
135 return ((unsigned char) WSTOPSIG (w));
138 /* Resume execution of the inferior process.
139 If STEP is nonzero, single-step it.
140 If SIGNAL is nonzero, give it that signal. */
143 myresume (step, signal)
148 ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
150 perror_with_name ("ptrace");
153 /* Fetch one or more registers from the inferior. REGNO == -1 to get
154 them all. We actually fetch more than requested, when convenient,
155 marking them as valid so we won't fetch them again. */
158 fetch_inferior_registers (ignored)
161 struct regs inferior_registers;
162 struct fp_status inferior_fp_registers;
164 ptrace (PTRACE_GETREGS, inferior_pid,
165 (PTRACE_ARG3_TYPE) &inferior_registers);
167 ptrace (PTRACE_GETFPREGS, inferior_pid,
168 (PTRACE_ARG3_TYPE) &inferior_fp_registers);
171 memcpy (registers, &inferior_registers, 16 * 4);
173 memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
174 sizeof inferior_fp_registers.fps_regs);
176 *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
177 *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
180 (®isters[REGISTER_BYTE (FPC_REGNUM)],
181 &inferior_fp_registers.fps_control,
182 sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
186 /* Store our register values back into the inferior.
187 If REGNO is -1, do this for all registers.
188 Otherwise, REGNO specifies which register (so we can save time). */
191 store_inferior_registers (ignored)
194 struct regs inferior_registers;
195 struct fp_status inferior_fp_registers;
197 memcpy (&inferior_registers, registers, 16 * 4);
199 memcpy (&inferior_fp_registers,
200 ®isters[REGISTER_BYTE (FP0_REGNUM)],
201 sizeof inferior_fp_registers.fps_regs);
203 inferior_registers.r_ps = *(int *)®isters[REGISTER_BYTE (PS_REGNUM)];
204 inferior_registers.r_pc = *(int *)®isters[REGISTER_BYTE (PC_REGNUM)];
207 memcpy (&inferior_fp_registers.fps_control,
208 ®isters[REGISTER_BYTE (FPC_REGNUM)],
209 (sizeof inferior_fp_registers
210 - sizeof inferior_fp_registers.fps_regs));
213 ptrace (PTRACE_SETREGS, inferior_pid,
214 (PTRACE_ARG3_TYPE) &inferior_registers);
216 ptrace (PTRACE_SETFPREGS, inferior_pid,
217 (PTRACE_ARG3_TYPE) &inferior_fp_registers);
221 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
222 in the NEW_SUN_PTRACE case.
223 It ought to be straightforward. But it appears that writing did
224 not write the data that I specified. I cannot understand where
225 it got the data that it actually did write. */
227 /* Copy LEN bytes from inferior's memory starting at MEMADDR
228 to debugger memory starting at MYADDR. */
230 read_inferior_memory (memaddr, myaddr, len)
236 /* Round starting address down to longword boundary. */
237 register CORE_ADDR addr = memaddr & -sizeof (int);
238 /* Round ending address up; get number of longwords that makes. */
240 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
241 /* Allocate buffer of that many longwords. */
242 register int *buffer = (int *) alloca (count * sizeof (int));
244 /* Read all the longwords */
245 for (i = 0; i < count; i++, addr += sizeof (int))
247 buffer[i] = ptrace (1, inferior_pid, addr, 0);
250 /* Copy appropriate bytes out of the buffer. */
251 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
254 /* Copy LEN bytes of data from debugger memory at MYADDR
255 to inferior's memory at MEMADDR.
256 On failure (cannot write the inferior)
257 returns the value of errno. */
260 write_inferior_memory (memaddr, myaddr, len)
266 /* Round starting address down to longword boundary. */
267 register CORE_ADDR addr = memaddr & -sizeof (int);
268 /* Round ending address up; get number of longwords that makes. */
270 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
271 /* Allocate buffer of that many longwords. */
272 register int *buffer = (int *) alloca (count * sizeof (int));
275 /* Fill start and end extra bytes of buffer with existing memory data. */
277 buffer[0] = ptrace (1, inferior_pid, addr, 0);
282 = ptrace (1, inferior_pid,
283 addr + (count - 1) * sizeof (int), 0);
286 /* Copy data to be written over corresponding part of buffer */
288 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
290 /* Write the entire buffer. */
292 for (i = 0; i < count; i++, addr += sizeof (int))
295 ptrace (4, inferior_pid, addr, buffer[i]);
312 return inferior_pid != 0;