| /* Low level interface to ptrace, for the remote server for GDB. |
| Copyright 1986, 1987, 1993, 1994, 1995, 1997, 1999, 2000, 2001 |
| 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "server.h" |
| #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*********************/ |
| static char my_registers[REGISTER_BYTES]; |
| char *registers = my_registers; |
| /***************End MY defs*********************/ |
| |
| #include <sys/ptrace.h> |
| #include <sys/reg.h> |
| |
| extern int sys_nerr; |
| extern char **sys_errlist; |
| extern int errno; |
| |
| /* Start an inferior process and returns its pid. |
| ALLARGS is a vector of program-name and args. */ |
| |
| int |
| create_inferior (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 (void) |
| { |
| if (inferior_pid == 0) |
| return; |
| ptrace (8, inferior_pid, 0, 0); |
| wait (0); |
| /*************inferior_died ();****VK**************/ |
| } |
| |
| /* Return nonzero if the given thread is still alive. */ |
| int |
| mythread_alive (int pid) |
| { |
| return 1; |
| } |
| |
| /* Wait for process, returns status */ |
| |
| unsigned char |
| mywait (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 = 'W'; |
| return ((unsigned char) WEXITSTATUS (w)); |
| } |
| else if (!WIFSTOPPED (w)) |
| { |
| fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); |
| *status = 'X'; |
| return ((unsigned char) WTERMSIG (w)); |
| } |
| |
| fetch_inferior_registers (0); |
| |
| *status = 'T'; |
| 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 (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 (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 (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1, |
| 15 * REGISTER_RAW_SIZE (G0_REGNUM)); |
| *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; |
| *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc; |
| *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc; |
| *(int *) ®isters[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 (®isters[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)], |
| ®isters[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 (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, ®isters[REGISTER_BYTE (L0_REGNUM)], |
| 16 * REGISTER_RAW_SIZE (L0_REGNUM)); |
| |
| memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)], |
| 15 * REGISTER_RAW_SIZE (G1_REGNUM)); |
| |
| inferior_registers.r_ps = |
| *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; |
| inferior_registers.r_pc = |
| *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; |
| inferior_registers.r_npc = |
| *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)]; |
| inferior_registers.r_y = |
| *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)]; |
| |
| if (ptrace (PTRACE_SETREGS, inferior_pid, |
| (PTRACE_ARG3_TYPE) & inferior_registers, 0)) |
| perror ("ptrace_setregs"); |
| |
| memcpy (&inferior_fp_registers, ®isters[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 (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. */ |
| memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), 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 (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_low (void) |
| { |
| } |