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. */
28 #include <sys/param.h>
32 #include <sys/ioctl.h>
37 /***************Begin MY defs*********************/
39 char registers[REGISTER_BYTES];
41 /* Index within `registers' of the first byte of the space for
45 char buf2[MAX_REGISTER_RAW_SIZE];
46 /***************End MY defs*********************/
48 #include <sys/ptrace.h>
49 #include <machine/reg.h>
51 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 (PT_TRACE_ME, 0, 0, 0);
75 execv (program, allargs);
77 fprintf (stderr, "Cannot exec %s: %s.\n", program, strerror(errno));
85 /* Kill the inferior process. Make us have no inferior. */
90 if (inferior_pid == 0)
92 ptrace (PT_KILL, inferior_pid, 0, 0);
94 /*************inferior_died ();****VK**************/
97 /* Return nonzero if the given thread is still alive. */
105 /* Wait for process, returns status */
115 if (pid != inferior_pid)
116 perror_with_name ("wait");
120 fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
122 return ((unsigned char) WEXITSTATUS (w));
124 else if (!WIFSTOPPED (w))
126 fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
128 return ((unsigned char) WTERMSIG (w));
131 fetch_inferior_registers (0);
134 return ((unsigned char) WSTOPSIG (w));
137 /* Resume execution of the inferior process.
138 If STEP is nonzero, single-step it.
139 If SIGNAL is nonzero, give it that signal. */
142 myresume (step, signal)
147 ptrace (step ? PT_STEP : PT_CONTINUE, inferior_pid,
148 (PTRACE_ARG3_TYPE) 1, signal);
150 perror_with_name ("ptrace");
153 #if defined(__i386__)
155 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
156 /* symbols like 'tEAX' come from <machine/reg.h> */
157 static int tregmap[] =
159 tEAX, tECX, tEDX, tEBX,
160 tESP, tEBP, tESI, tEDI,
161 tEIP, tEFLAGS, tCS, tSS,
165 static struct save87 pcb_savefpu;
168 fetch_inferior_registers (regno)
171 struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
174 ptrace (PT_GETREGS, inferior_pid,
175 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
177 for (r = 0; r < NUM_REGS; r++)
178 memcpy (®isters[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4);
182 store_inferior_registers (regno)
185 struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
188 ptrace (PT_GETREGS, inferior_pid,
189 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
191 for (r = 0; r < NUM_REGS; r++)
192 memcpy (((int *)&inferior_registers) + tregmap[r], ®isters[REGISTER_BYTE (r)], 4);
194 ptrace (PT_SETREGS, inferior_pid,
195 (PTRACE_ARG3_TYPE) &inferior_registers, 0);
198 #elif defined(__alpha__)
201 fetch_inferior_registers (regno)
204 struct reg regs; /* ptrace order, not gcc/gdb order */
208 ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
209 ptrace (PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
211 for (r = 0; r < 31; r++)
212 memcpy (®isters[REGISTER_BYTE (r)],
213 ®s.r_regs[r], sizeof(u_int64_t));
214 for (r = 0; r < 32; r++)
215 memcpy (®isters[REGISTER_BYTE (r + FP0_REGNUM)],
216 &fpregs.fpr_regs[r], sizeof(u_int64_t));
217 memcpy (®isters[REGISTER_BYTE (PC_REGNUM)],
218 ®s.r_regs[31], sizeof(u_int64_t));
220 memset (®isters[REGISTER_BYTE (ZERO_REGNUM)], 0, sizeof(u_int64_t));
221 memset (®isters[REGISTER_BYTE (FP_REGNUM)], 0, sizeof(u_int64_t));
225 store_inferior_registers (regno)
228 struct reg regs; /* ptrace order, not gcc/gdb order */
232 for (r = 0; r < 31; r++)
233 memcpy (®s.r_regs[r],
234 ®isters[REGISTER_BYTE (r)], sizeof(u_int64_t));
235 for (r = 0; r < 32; r++)
236 memcpy (&fpregs.fpr_regs[r],
237 ®isters[REGISTER_BYTE (r + FP0_REGNUM)], sizeof(u_int64_t));
238 memcpy (®s.r_regs[31],
239 ®isters[REGISTER_BYTE (PC_REGNUM)], sizeof(u_int64_t));
241 ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
242 ptrace (PT_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
248 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
249 in the NEW_SUN_PTRACE case.
250 It ought to be straightforward. But it appears that writing did
251 not write the data that I specified. I cannot understand where
252 it got the data that it actually did write. */
254 /* Copy LEN bytes from inferior's memory starting at MEMADDR
255 to debugger memory starting at MYADDR. */
257 read_inferior_memory (memaddr, myaddr, len)
263 /* Round starting address down to longword boundary. */
264 register CORE_ADDR addr = memaddr & -sizeof (int);
265 /* Round ending address up; get number of longwords that makes. */
267 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
268 /* Allocate buffer of that many longwords. */
269 register int *buffer = (int *) alloca (count * sizeof (int));
271 /* Read all the longwords */
272 for (i = 0; i < count; i++, addr += sizeof (int))
274 buffer[i] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
277 /* Copy appropriate bytes out of the buffer. */
278 memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
281 /* Copy LEN bytes of data from debugger memory at MYADDR
282 to inferior's memory at MEMADDR.
283 On failure (cannot write the inferior)
284 returns the value of errno. */
287 write_inferior_memory (memaddr, myaddr, len)
293 /* Round starting address down to longword boundary. */
294 register CORE_ADDR addr = memaddr & -sizeof (int);
295 /* Round ending address up; get number of longwords that makes. */
297 = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
298 /* Allocate buffer of that many longwords. */
299 register int *buffer = (int *) alloca (count * sizeof (int));
302 /* Fill start and end extra bytes of buffer with existing memory data. */
304 buffer[0] = ptrace (PT_READ_I, inferior_pid,
305 (PTRACE_ARG3_TYPE) addr, 0);
310 = ptrace (PT_READ_I, inferior_pid,
311 (PTRACE_ARG3_TYPE) addr + (count - 1) * sizeof (int), 0);
314 /* Copy data to be written over corresponding part of buffer */
316 memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
318 /* Write the entire buffer. */
320 for (i = 0; i < count; i++, addr += sizeof (int))
323 ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
340 return inferior_pid != 0;