X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Finfptrace.c;h=0a74b5d63a4892692930dbfaffe06679688f0eb5;hb=4b14d3e4e0d9ba2ff2f9397312f884f8fc9a1135;hp=0013e91b97ce0292ed490cf3aaeb0c32523d2ec7;hpb=2b57629364528ef2fd913154e58f626123d51f1c;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/infptrace.c b/gdb/infptrace.c index 0013e91b97..0a74b5d63a 100644 --- a/gdb/infptrace.c +++ b/gdb/infptrace.c @@ -1,22 +1,23 @@ /* Low level Unix child interface to ptrace, for GDB when running under Unix. - Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995 + Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 1998 Free Software Foundation, Inc. -This file is part of GDB. + 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 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. + 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. */ + 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 "defs.h" #include "frame.h" @@ -24,37 +25,54 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "target.h" #include "gdb_string.h" +#include "gdb_wait.h" + +#include "command.h" + #ifdef USG #include #endif #include -#include +#include "gdb_dirent.h" #include #include -#ifndef NO_PTRACE_H -#ifdef PTRACE_IN_WRONG_PLACE +#ifdef HAVE_PTRACE_H #include #else +#ifdef HAVE_SYS_PTRACE_H #include #endif -#endif /* NO_PTRACE_H */ - -#if !defined (PT_KILL) -#define PT_KILL 8 #endif +#if !defined (PT_READ_I) +#define PT_READ_I 1 /* Read word from text space */ +#endif +#if !defined (PT_READ_D) +#define PT_READ_D 2 /* Read word from data space */ +#endif +#if !defined (PT_READ_U) +#define PT_READ_U 3 /* Read word from kernel user struct */ +#endif +#if !defined (PT_WRITE_I) +#define PT_WRITE_I 4 /* Write word to text space */ +#endif +#if !defined (PT_WRITE_D) +#define PT_WRITE_D 5 /* Write word to data space */ +#endif +#if !defined (PT_WRITE_U) +#define PT_WRITE_U 6 /* Write word to kernel user struct */ +#endif +#if !defined (PT_CONTINUE) +#define PT_CONTINUE 7 /* Continue after signal */ +#endif #if !defined (PT_STEP) -#define PT_STEP 9 -#define PT_CONTINUE 7 -#define PT_READ_U 3 -#define PT_WRITE_U 6 -#define PT_READ_I 1 -#define PT_READ_D 2 -#define PT_WRITE_I 4 -#define PT_WRITE_D 5 -#endif /* No PT_STEP. */ +#define PT_STEP 9 /* Set flag for single stepping */ +#endif +#if !defined (PT_KILL) +#define PT_KILL 8 /* Send child a SIGKILL signal */ +#endif #ifndef PT_ATTACH #define PT_ATTACH PTRACE_ATTACH @@ -81,7 +99,35 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #endif /* KERNEL_U_ADDR_BSD. */ #endif /* !FETCH_INFERIOR_REGISTERS */ +#if !defined (CHILD_XFER_MEMORY) +static void udot_info PARAMS ((char *, int)); +#endif + +#if !defined (FETCH_INFERIOR_REGISTERS) +static void fetch_register PARAMS ((int)); +static void store_register PARAMS ((int)); +#endif + +/* + * Some systems (Linux) may have threads implemented as pseudo-processes, + * in which case we may be tracing more than one process at a time. + * In that case, inferior_pid will contain the main process ID and the + * individual thread (process) id mashed together. These macros are + * used to separate them out. The definitions may be overridden in tm.h + * + * NOTE: default definitions here are for systems with no threads. + * Useful definitions MUST be provided in tm.h + */ + +#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */ +#define PIDGET(PID) PID +#define TIDGET(PID) 0 +#endif + +void _initialize_kernel_u_addr PARAMS ((void)); +void _initialize_infptrace PARAMS ((void)); + /* This function simply calls ptrace with the given arguments. It exists so that all calls to ptrace are isolated in this machine-dependent file. */ @@ -91,34 +137,114 @@ call_ptrace (request, pid, addr, data) PTRACE_ARG3_TYPE addr; int data; { - return ptrace (request, pid, addr, data -#if defined (FIVE_ARG_PTRACE) - /* Deal with HPUX 8.0 braindamage. We never use the - calls which require the fifth argument. */ - , 0 + int pt_status = 0; + +#if 0 + int saved_errno; + + printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)", + request, pid, addr, data); +#endif +#if defined(PT_SETTRC) + /* If the parent can be told to attach to us, try to do it. */ + if (request == PT_SETTRC) + { + errno = 0; +#if !defined (FIVE_ARG_PTRACE) + pt_status = ptrace (PT_SETTRC, pid, addr, data); +#else + /* Deal with HPUX 8.0 braindamage. We never use the + calls which require the fifth argument. */ + pt_status = ptrace (PT_SETTRC, pid, addr, data, 0); #endif - ); + if (errno) + perror_with_name ("ptrace"); +#if 0 + printf (" = %d\n", pt_status); +#endif + if (pt_status < 0) + return pt_status; + else + return parent_attach_all (pid, addr, data); + } +#endif + +#if defined(PT_CONTIN1) + /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending + signals. If it's available, use it. */ + if (request == PT_CONTINUE) + request = PT_CONTIN1; +#endif + +#if defined(PT_SINGLE1) + /* On HPUX, PT_SINGLE1 is a form of step that preserves pending + signals. If it's available, use it. */ + if (request == PT_STEP) + request = PT_SINGLE1; +#endif + +#if 0 + saved_errno = errno; + errno = 0; +#endif +#if !defined (FIVE_ARG_PTRACE) + pt_status = ptrace (request, pid, addr, data); +#else + /* Deal with HPUX 8.0 braindamage. We never use the + calls which require the fifth argument. */ + pt_status = ptrace (request, pid, addr, data, 0); +#endif + +#if 0 + if (errno) + printf (" [errno = %d]", errno); + + errno = saved_errno; + printf (" = 0x%x\n", pt_status); +#endif + return pt_status; } + #if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE) /* For the rest of the file, use an extra level of indirection */ /* This lets us breakpoint usefully on call_ptrace. */ #define ptrace call_ptrace #endif +/* Wait for a process to finish, possibly running a target-specific + hook before returning. */ + +int +ptrace_wait (pid, status) + int pid; + int *status; +{ + int wstate; + + wstate = wait (status); + target_post_wait (wstate, *status); + return wstate; +} + void kill_inferior () { + int status; + if (inferior_pid == 0) return; - /* ptrace PT_KILL only works if process is stopped!!! So stop it with - a real signal first, if we can. FIXME: This is bogus. When the inferior - is not stopped, GDB should just be waiting for it. Either the following - line is unecessary, or there is some problem elsewhere in GDB which - causes us to get here when the inferior is not stopped. */ - kill (inferior_pid, SIGKILL); + + /* This once used to call "kill" to kill the inferior just in case + the inferior was still running. As others have noted in the past + (kingdon) there shouldn't be any way to get here if the inferior + is still running -- else there's a major problem elsewere in gdb + and it needs to be fixed. + + The kill call causes problems under hpux10, so it's been removed; + if this causes problems we'll deal with them as they arise. */ ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); - wait ((int *)0); + ptrace_wait (0, &status); target_mourn_inferior (); } @@ -152,18 +278,25 @@ child_resume (pid, step, signal) instructions), so we don't have to worry about that here. */ if (step) - ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, - target_signal_to_host (signal)); + { + if (SOFTWARE_SINGLE_STEP_P) + abort (); /* Make sure this doesn't happen. */ + else + ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, + target_signal_to_host (signal)); + } else ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, target_signal_to_host (signal)); if (errno) - perror_with_name ("ptrace"); + { + perror_with_name ("ptrace"); + } } #endif /* CHILD_RESUME */ - + #ifdef ATTACH_DETACH /* Start debugging the process whose number is PID. */ int @@ -217,7 +350,7 @@ _initialize_kernel_u_addr () if (nlist ("/vmunix", names) == 0) kernel_u_addr = names[0].n_value; else - fatal ("Unable to get kernel u area address."); + internal_error ("Unable to get kernel u area address."); #endif /* KERNEL_U_ADDR_BSD. */ } @@ -248,12 +381,11 @@ fetch_register (regno) { /* This isn't really an address. But ptrace thinks of it as one. */ CORE_ADDR regaddr; - char buf[MAX_REGISTER_RAW_SIZE]; - char mess[128]; /* For messages */ + char mess[128]; /* For messages */ register int i; - - /* Offset of registers within the u area. */ - unsigned int offset; + unsigned int offset; /* Offset of registers within the u area. */ + char buf[MAX_REGISTER_RAW_SIZE]; + int tid; if (CANNOT_FETCH_REGISTER (regno)) { @@ -262,18 +394,23 @@ fetch_register (regno) return; } + /* Overload thread id onto process id */ + if ((tid = TIDGET (inferior_pid)) == 0) + tid = inferior_pid; /* no thread id, just use process id */ + offset = U_REGS_OFFSET; regaddr = register_addr (regno, offset); for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { errno = 0; - *(PTRACE_XFER_TYPE *) &buf[i] = ptrace (PT_READ_U, inferior_pid, - (PTRACE_ARG3_TYPE) regaddr, 0); + *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, + (PTRACE_ARG3_TYPE) regaddr, 0); regaddr += sizeof (PTRACE_XFER_TYPE); if (errno != 0) { - sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); + sprintf (mess, "reading register %s (#%d)", + REGISTER_NAME (regno), regno); perror_with_name (mess); } } @@ -281,22 +418,25 @@ fetch_register (regno) } -/* Fetch all registers, or just one, from the child process. */ +/* Fetch register values from the inferior. + If REGNO is negative, do this for all registers. + Otherwise, REGNO specifies which register (so we can save time). */ void fetch_inferior_registers (regno) int regno; { - int numregs; - - if (regno == -1) + if (regno >= 0) { - numregs = ARCH_NUM_REGS; - for (regno = 0; regno < numregs; regno++) - fetch_register (regno); + fetch_register (regno); } else - fetch_register (regno); + { + for (regno = 0; regno < ARCH_NUM_REGS; regno++) + { + fetch_register (regno); + } + } } /* Registers we shouldn't try to store. */ @@ -304,57 +444,63 @@ fetch_inferior_registers (regno) #define CANNOT_STORE_REGISTER(regno) 0 #endif -/* 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). */ +/* Store one register. */ -void -store_inferior_registers (regno) +static void +store_register (regno) int regno; { /* This isn't really an address. But ptrace thinks of it as one. */ CORE_ADDR regaddr; - char buf[80]; - register int i, numregs; + char mess[128]; /* For messages */ + register int i; + unsigned int offset; /* Offset of registers within the u area. */ + int tid; - unsigned int offset = U_REGS_OFFSET; + if (CANNOT_STORE_REGISTER (regno)) + { + return; + } - if (regno >= 0) + /* Overload thread id onto process id */ + if ((tid = TIDGET (inferior_pid)) == 0) + tid = inferior_pid; /* no thread id, just use process id */ + + offset = U_REGS_OFFSET; + + regaddr = register_addr (regno, offset); + for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) { - regaddr = register_addr (regno, offset); - for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(PTRACE_XFER_TYPE)) + errno = 0; + ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, + *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); + regaddr += sizeof (PTRACE_XFER_TYPE); + if (errno != 0) { - errno = 0; - ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, - *(PTRACE_XFER_TYPE *) ®isters[REGISTER_BYTE (regno) + i]); - if (errno != 0) - { - sprintf (buf, "writing register number %d(%d)", regno, i); - perror_with_name (buf); - } - regaddr += sizeof(PTRACE_XFER_TYPE); + sprintf (mess, "writing register %s (#%d)", + REGISTER_NAME (regno), regno); + perror_with_name (mess); } } +} + +/* Store our register values back into the inferior. + If REGNO is negative, do this for all registers. + Otherwise, REGNO specifies which register (so we can save time). */ + +void +store_inferior_registers (regno) + int regno; +{ + if (regno >= 0) + { + store_register (regno); + } else { - numregs = ARCH_NUM_REGS; - for (regno = 0; regno < numregs; regno++) + for (regno = 0; regno < ARCH_NUM_REGS; regno++) { - if (CANNOT_STORE_REGISTER (regno)) - continue; - regaddr = register_addr (regno, offset); - for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(PTRACE_XFER_TYPE)) - { - errno = 0; - ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, - *(PTRACE_XFER_TYPE *) ®isters[REGISTER_BYTE (regno) + i]); - if (errno != 0) - { - sprintf (buf, "writing register number %d(%d)", regno, i); - perror_with_name (buf); - } - regaddr += sizeof(PTRACE_XFER_TYPE); - } + store_register (regno); } } } @@ -371,7 +517,7 @@ store_inferior_registers (regno) /* Copy LEN bytes to or from inferior's memory starting at MEMADDR to debugger memory starting at MYADDR. Copy to inferior if WRITE is nonzero. - + Returns the length copied, which is either the LEN argument or zero. This xfer function does not do partial moves, since child_ops doesn't allow memory operations to cross below us in the target stack @@ -383,33 +529,34 @@ child_xfer_memory (memaddr, myaddr, len, write, target) char *myaddr; int len; int write; - struct target_ops *target; /* ignored */ + struct target_ops *target; /* ignored */ { register int i; /* Round starting address down to longword boundary. */ - register CORE_ADDR addr = memaddr & - sizeof (PTRACE_XFER_TYPE); + register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); /* Round ending address up; get number of longwords that makes. */ register int count - = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) - / sizeof (PTRACE_XFER_TYPE); + = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) + / sizeof (PTRACE_XFER_TYPE); /* Allocate buffer of that many longwords. */ register PTRACE_XFER_TYPE *buffer - = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); + = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); if (write) { /* Fill start and end extra bytes of buffer with existing memory data. */ - if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) { - /* Need part of initial word -- fetch it. */ - buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, - 0); - } + if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) + { + /* Need part of initial word -- fetch it. */ + buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_pid), + (PTRACE_ARG3_TYPE) addr, 0); + } if (count > 1) /* FIXME, avoid if even boundary */ { - buffer[count - 1] - = ptrace (PT_READ_I, inferior_pid, + buffer[count - 1] + = ptrace (PT_READ_I, PIDGET (inferior_pid), ((PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), 0); @@ -426,19 +573,22 @@ child_xfer_memory (memaddr, myaddr, len, write, target) for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) { errno = 0; - ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, - buffer[i]); + ptrace (PT_WRITE_D, PIDGET (inferior_pid), + (PTRACE_ARG3_TYPE) addr, buffer[i]); if (errno) { /* Using the appropriate one (I or D) is necessary for - Gould NP1, at least. */ + Gould NP1, at least. */ errno = 0; - ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, - buffer[i]); + ptrace (PT_WRITE_I, PIDGET (inferior_pid), + (PTRACE_ARG3_TYPE) addr, buffer[i]); } if (errno) return 0; } +#ifdef CLEAR_INSN_CACHE + CLEAR_INSN_CACHE (); +#endif } else { @@ -446,7 +596,7 @@ child_xfer_memory (memaddr, myaddr, len, write, target) for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) { errno = 0; - buffer[i] = ptrace (PT_READ_I, inferior_pid, + buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_pid), (PTRACE_ARG3_TYPE) addr, 0); if (errno) return 0; @@ -460,4 +610,65 @@ child_xfer_memory (memaddr, myaddr, len, write, target) } return len; } + + +static void +udot_info (dummy1, dummy2) + char *dummy1; + int dummy2; +{ +#if defined (KERNEL_U_SIZE) + int udot_off; /* Offset into user struct */ + int udot_val; /* Value from user struct at udot_off */ + char mess[128]; /* For messages */ +#endif + + if (!target_has_execution) + { + error ("The program is not being run."); + } + +#if !defined (KERNEL_U_SIZE) + + /* Adding support for this command is easy. Typically you just add a + routine, called "kernel_u_size" that returns the size of the user + struct, to the appropriate *-nat.c file and then add to the native + config file "#define KERNEL_U_SIZE kernel_u_size()" */ + error ("Don't know how large ``struct user'' is in this version of gdb."); + +#else + + for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) + { + if ((udot_off % 24) == 0) + { + if (udot_off > 0) + { + printf_filtered ("\n"); + } + printf_filtered ("%04x:", udot_off); + } + udot_val = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) udot_off, 0); + if (errno != 0) + { + sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); + perror_with_name (mess); + } + /* Avoid using nonportable (?) "*" in print specs */ + printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); + } + printf_filtered ("\n"); + +#endif +} #endif /* !defined (CHILD_XFER_MEMORY). */ + + +void +_initialize_infptrace () +{ +#if !defined (CHILD_XFER_MEMORY) + add_info ("udot", udot_info, + "Print contents of kernel ``struct user'' for current child."); +#endif +}