| /* Native support code for HPUX PA-RISC. |
| Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
| 1998, 1999, 2000, 2001 |
| Free Software Foundation, Inc. |
| |
| Contributed by the Center for Software Science at the |
| University of Utah (pa-gdb-bugs@cs.utah.edu). |
| |
| 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 "defs.h" |
| #include "inferior.h" |
| #include "target.h" |
| #include <sys/ptrace.h> |
| #include "gdbcore.h" |
| #include "gdb_wait.h" |
| #include "regcache.h" |
| #include "gdb_string.h" |
| #include <signal.h> |
| |
| extern CORE_ADDR text_end; |
| |
| extern int hpux_has_forked (int pid, int *childpid); |
| extern int hpux_has_vforked (int pid, int *childpid); |
| extern int hpux_has_execd (int pid, char **execd_pathname); |
| extern int hpux_has_syscall_event (int pid, enum target_waitkind *kind, |
| int *syscall_id); |
| |
| static void fetch_register (int); |
| |
| void |
| fetch_inferior_registers (int regno) |
| { |
| if (regno == -1) |
| for (regno = 0; regno < NUM_REGS; regno++) |
| fetch_register (regno); |
| else |
| fetch_register (regno); |
| } |
| |
| /* Our own version of the offsetof macro, since we can't assume ANSI C. */ |
| #define HPPAH_OFFSETOF(type, member) ((int) (&((type *) 0)->member)) |
| |
| /* 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 regno) |
| { |
| register unsigned int regaddr; |
| char buf[80]; |
| register int i; |
| unsigned int offset = U_REGS_OFFSET; |
| int scratch; |
| |
| if (regno >= 0) |
| { |
| unsigned int addr, len, offset; |
| |
| if (CANNOT_STORE_REGISTER (regno)) |
| return; |
| |
| offset = 0; |
| len = REGISTER_RAW_SIZE (regno); |
| |
| /* Requests for register zero actually want the save_state's |
| ss_flags member. As RM says: "Oh, what a hack!" */ |
| if (regno == 0) |
| { |
| save_state_t ss; |
| addr = HPPAH_OFFSETOF (save_state_t, ss_flags); |
| len = sizeof (ss.ss_flags); |
| |
| /* Note that ss_flags is always an int, no matter what |
| REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines |
| are big-endian, put it at the least significant end of the |
| value, and zap the rest of the buffer. */ |
| offset = REGISTER_RAW_SIZE (0) - len; |
| } |
| |
| /* Floating-point registers come from the ss_fpblock area. */ |
| else if (regno >= FP0_REGNUM) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); |
| |
| /* Wide registers come from the ss_wide area. |
| I think it's more PC to test (ss_flags & SS_WIDEREGS) to select |
| between ss_wide and ss_narrow than to use the raw register size. |
| But checking ss_flags would require an extra ptrace call for |
| every register reference. Bleah. */ |
| else if (len == 8) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) |
| + REGISTER_BYTE (regno)); |
| |
| /* Narrow registers come from the ss_narrow area. Note that |
| ss_narrow starts with gr1, not gr0. */ |
| else if (len == 4) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); |
| else |
| internal_error (__FILE__, __LINE__, |
| "hppah-nat.c (write_register): unexpected register size"); |
| |
| #ifdef GDB_TARGET_IS_HPPA_20W |
| /* Unbelieveable. The PC head and tail must be written in 64bit hunks |
| or we will get an error. Worse yet, the oddball ptrace/ttrace |
| layering will not allow us to perform a 64bit register store. |
| |
| What a crock. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM && len == 8) |
| { |
| CORE_ADDR temp; |
| |
| temp = *(CORE_ADDR *)&deprecated_registers[REGISTER_BYTE (regno)]; |
| |
| /* Set the priv level (stored in the low two bits of the PC. */ |
| temp |= 0x3; |
| |
| ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
| (CORE_ADDR)&temp); |
| |
| /* If we fail to write the PC, give a true error instead of |
| just a warning. */ |
| if (errno != 0) |
| { |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "writing `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| perror_with_name (msg); |
| } |
| return; |
| } |
| |
| /* Another crock. HPUX complains if you write a nonzero value to |
| the high part of IPSW. What will it take for HP to catch a |
| clue about building sensible interfaces? */ |
| if (regno == IPSW_REGNUM && len == 8) |
| *(int *)&deprecated_registers[REGISTER_BYTE (regno)] = 0; |
| #endif |
| |
| for (i = 0; i < len; i += sizeof (int)) |
| { |
| errno = 0; |
| call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr + i, |
| *(int *) &deprecated_registers[REGISTER_BYTE (regno) + i]); |
| if (errno != 0) |
| { |
| /* Warning, not error, in case we are attached; sometimes |
| the kernel doesn't let us at the registers. */ |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "writing `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| /* If we fail to write the PC, give a true error instead of |
| just a warning. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| perror_with_name (msg); |
| else |
| warning (msg); |
| return; |
| } |
| } |
| } |
| else |
| for (regno = 0; regno < NUM_REGS; regno++) |
| store_inferior_registers (regno); |
| } |
| |
| |
| /* Fetch a register's value from the process's U area. */ |
| static void |
| fetch_register (int regno) |
| { |
| char buf[MAX_REGISTER_SIZE]; |
| unsigned int addr, len, offset; |
| int i; |
| |
| offset = 0; |
| len = REGISTER_RAW_SIZE (regno); |
| |
| /* Requests for register zero actually want the save_state's |
| ss_flags member. As RM says: "Oh, what a hack!" */ |
| if (regno == 0) |
| { |
| save_state_t ss; |
| addr = HPPAH_OFFSETOF (save_state_t, ss_flags); |
| len = sizeof (ss.ss_flags); |
| |
| /* Note that ss_flags is always an int, no matter what |
| REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines |
| are big-endian, put it at the least significant end of the |
| value, and zap the rest of the buffer. */ |
| offset = REGISTER_RAW_SIZE (0) - len; |
| memset (buf, 0, sizeof (buf)); |
| } |
| |
| /* Floating-point registers come from the ss_fpblock area. */ |
| else if (regno >= FP0_REGNUM) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); |
| |
| /* Wide registers come from the ss_wide area. |
| I think it's more PC to test (ss_flags & SS_WIDEREGS) to select |
| between ss_wide and ss_narrow than to use the raw register size. |
| But checking ss_flags would require an extra ptrace call for |
| every register reference. Bleah. */ |
| else if (len == 8) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) |
| + REGISTER_BYTE (regno)); |
| |
| /* Narrow registers come from the ss_narrow area. Note that |
| ss_narrow starts with gr1, not gr0. */ |
| else if (len == 4) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); |
| |
| else |
| internal_error (__FILE__, __LINE__, |
| "hppa-nat.c (fetch_register): unexpected register size"); |
| |
| for (i = 0; i < len; i += sizeof (int)) |
| { |
| errno = 0; |
| /* Copy an int from the U area to buf. Fill the least |
| significant end if len != raw_size. */ |
| * (int *) &buf[offset + i] = |
| call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr + i, 0); |
| if (errno != 0) |
| { |
| /* Warning, not error, in case we are attached; sometimes |
| the kernel doesn't let us at the registers. */ |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "reading `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| warning (msg); |
| return; |
| } |
| } |
| |
| /* If we're reading an address from the instruction address queue, |
| mask out the bottom two bits --- they contain the privilege |
| level. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| buf[len - 1] &= ~0x3; |
| |
| supply_register (regno, buf); |
| } |
| |
| |
| /* 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 |
| anyway. TARGET is ignored. */ |
| |
| int |
| child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| struct mem_attrib *mem, |
| struct target_ops *target) |
| { |
| register int i; |
| /* Round starting address down to longword boundary. */ |
| register CORE_ADDR addr = memaddr & - (CORE_ADDR)(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. |
| Note -- do not use alloca to allocate this buffer since there is no |
| guarantee of when the buffer will actually be deallocated. |
| |
| This routine can be called over and over with the same call chain; |
| this (in effect) would pile up all those alloca requests until a call |
| to alloca was made from a point higher than this routine in the |
| call chain. */ |
| register int *buffer = (int *) xmalloc (count * sizeof (int)); |
| |
| if (write) |
| { |
| /* Fill start and end extra bytes of buffer with existing memory data. */ |
| if (addr != memaddr || len < (int) sizeof (int)) |
| { |
| /* Need part of initial word -- fetch it. */ |
| buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, 0); |
| } |
| |
| if (count > 1) /* FIXME, avoid if even boundary */ |
| { |
| buffer[count - 1] |
| = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) (addr |
| + (count - 1) * sizeof (int)), |
| 0); |
| } |
| |
| /* Copy data to be written over corresponding part of buffer */ |
| memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| |
| /* Write the entire buffer. */ |
| for (i = 0; i < count; i++, addr += sizeof (int)) |
| { |
| int pt_status; |
| int pt_request; |
| /* The HP-UX kernel crashes if you use PT_WDUSER to write into the |
| text segment. FIXME -- does it work to write into the data |
| segment using WIUSER, or do these idiots really expect us to |
| figure out which segment the address is in, so we can use a |
| separate system call for it??! */ |
| errno = 0; |
| pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
| pt_status = call_ptrace (pt_request, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, |
| buffer[i]); |
| |
| /* Did we fail? Might we've guessed wrong about which |
| segment this address resides in? Try the other request, |
| and see if that works... */ |
| if ((pt_status == -1) && errno) |
| { |
| errno = 0; |
| pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; |
| pt_status = call_ptrace (pt_request, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, |
| buffer[i]); |
| |
| /* No, we still fail. Okay, time to punt. */ |
| if ((pt_status == -1) && errno) |
| { |
| xfree (buffer); |
| return 0; |
| } |
| } |
| } |
| } |
| else |
| { |
| /* Read all the longwords */ |
| for (i = 0; i < count; i++, addr += sizeof (int)) |
| { |
| errno = 0; |
| buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, 0); |
| if (errno) |
| { |
| xfree (buffer); |
| return 0; |
| } |
| QUIT; |
| } |
| |
| /* Copy appropriate bytes out of the buffer. */ |
| memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| } |
| xfree (buffer); |
| return len; |
| } |
| |
| char *saved_child_execd_pathname = NULL; |
| int saved_vfork_pid; |
| enum { |
| STATE_NONE, |
| STATE_GOT_CHILD, |
| STATE_GOT_EXEC, |
| STATE_GOT_PARENT, |
| STATE_FAKE_EXEC |
| } saved_vfork_state = STATE_NONE; |
| |
| int |
| child_follow_fork (int follow_child) |
| { |
| ptid_t last_ptid; |
| struct target_waitstatus last_status; |
| int has_vforked; |
| int parent_pid, child_pid; |
| |
| get_last_target_status (&last_ptid, &last_status); |
| has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
| parent_pid = ptid_get_pid (last_ptid); |
| child_pid = last_status.value.related_pid; |
| |
| /* At this point, if we are vforking, breakpoints were already |
| detached from the child in child_wait; and the child has already |
| called execve(). If we are forking, both the parent and child |
| have breakpoints inserted. */ |
| |
| if (! follow_child) |
| { |
| if (! has_vforked) |
| { |
| detach_breakpoints (child_pid); |
| #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
| SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
| #endif |
| } |
| |
| /* Detach from the child. */ |
| printf_unfiltered ("Detaching after fork from %s\n", |
| target_pid_to_str (pid_to_ptid (child_pid))); |
| hppa_require_detach (child_pid, 0); |
| |
| /* The parent and child of a vfork share the same address space. |
| Also, on some targets the order in which vfork and exec events |
| are received for parent in child requires some delicate handling |
| of the events. |
| |
| For instance, on ptrace-based HPUX we receive the child's vfork |
| event first, at which time the parent has been suspended by the |
| OS and is essentially untouchable until the child's exit or second |
| exec event arrives. At that time, the parent's vfork event is |
| delivered to us, and that's when we see and decide how to follow |
| the vfork. But to get to that point, we must continue the child |
| until it execs or exits. To do that smoothly, all breakpoints |
| must be removed from the child, in case there are any set between |
| the vfork() and exec() calls. But removing them from the child |
| also removes them from the parent, due to the shared-address-space |
| nature of a vfork'd parent and child. On HPUX, therefore, we must |
| take care to restore the bp's to the parent before we continue it. |
| Else, it's likely that we may not stop in the expected place. (The |
| worst scenario is when the user tries to step over a vfork() call; |
| the step-resume bp must be restored for the step to properly stop |
| in the parent after the call completes!) |
| |
| Sequence of events, as reported to gdb from HPUX: |
| |
| Parent Child Action for gdb to take |
| ------------------------------------------------------- |
| 1 VFORK Continue child |
| 2 EXEC |
| 3 EXEC or EXIT |
| 4 VFORK |
| |
| Now that the child has safely exec'd or exited, we must restore |
| the parent's breakpoints before we continue it. Else, we may |
| cause it run past expected stopping points. */ |
| |
| if (has_vforked) |
| reattach_breakpoints (parent_pid); |
| } |
| else |
| { |
| /* Needed to keep the breakpoint lists in sync. */ |
| if (! has_vforked) |
| detach_breakpoints (child_pid); |
| |
| /* Before detaching from the parent, remove all breakpoints from it. */ |
| remove_breakpoints (); |
| |
| /* Also reset the solib inferior hook from the parent. */ |
| #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
| SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
| #endif |
| |
| /* Detach from the parent. */ |
| target_detach (NULL, 1); |
| |
| /* Attach to the child. */ |
| printf_unfiltered ("Attaching after fork to %s\n", |
| target_pid_to_str (pid_to_ptid (child_pid))); |
| hppa_require_attach (child_pid); |
| inferior_ptid = pid_to_ptid (child_pid); |
| |
| /* If we vforked, then we've also execed by now. The exec will be |
| reported momentarily. follow_exec () will handle breakpoints, so |
| we don't have to.. */ |
| if (!has_vforked) |
| follow_inferior_reset_breakpoints (); |
| } |
| |
| if (has_vforked) |
| { |
| /* If we followed the parent, don't try to follow the child's exec. */ |
| if (saved_vfork_state != STATE_GOT_PARENT |
| && saved_vfork_state != STATE_FAKE_EXEC) |
| fprintf_unfiltered (gdb_stdout, |
| "hppa: post follow vfork: confused state\n"); |
| |
| if (! follow_child || saved_vfork_state == STATE_GOT_PARENT) |
| saved_vfork_state = STATE_NONE; |
| else |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Format a process id, given PID. Be sure to terminate |
| this with a null--it's going to be printed via a "%s". */ |
| char * |
| child_pid_to_str (ptid_t ptid) |
| { |
| /* Static because address returned */ |
| static char buf[30]; |
| pid_t pid = PIDGET (ptid); |
| |
| /* Extra NUL for paranoia's sake */ |
| sprintf (buf, "process %d%c", pid, '\0'); |
| |
| return buf; |
| } |
| |
| /* Format a thread id, given TID. Be sure to terminate |
| this with a null--it's going to be printed via a "%s". |
| |
| Note: This is a core-gdb tid, not the actual system tid. |
| See infttrace.c for details. */ |
| char * |
| hppa_tid_to_str (ptid_t ptid) |
| { |
| /* Static because address returned */ |
| static char buf[30]; |
| /* This seems strange, but when I did the ptid conversion, it looked |
| as though a pid was always being passed. - Kevin Buettner */ |
| pid_t tid = PIDGET (ptid); |
| |
| /* Extra NULLs for paranoia's sake */ |
| sprintf (buf, "system thread %d%c", tid, '\0'); |
| |
| return buf; |
| } |
| |
| /*## */ |
| /* Enable HACK for ttrace work. In |
| * infttrace.c/require_notification_of_events, |
| * this is set to 0 so that the loop in child_wait |
| * won't loop. |
| */ |
| int not_same_real_pid = 1; |
| /*## */ |
| |
| /* Wait for child to do something. Return pid of child, or -1 in case |
| of error; store status through argument pointer OURSTATUS. */ |
| |
| ptid_t |
| child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) |
| { |
| int save_errno; |
| int status; |
| char *execd_pathname = NULL; |
| int exit_status; |
| int related_pid; |
| int syscall_id; |
| enum target_waitkind kind; |
| int pid; |
| |
| if (saved_vfork_state == STATE_FAKE_EXEC) |
| { |
| saved_vfork_state = STATE_NONE; |
| ourstatus->kind = TARGET_WAITKIND_EXECD; |
| ourstatus->value.execd_pathname = saved_child_execd_pathname; |
| return inferior_ptid; |
| } |
| |
| do |
| { |
| set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| attached process. */ |
| set_sigio_trap (); |
| |
| pid = ptrace_wait (inferior_ptid, &status); |
| |
| save_errno = errno; |
| |
| clear_sigio_trap (); |
| |
| clear_sigint_trap (); |
| |
| if (pid == -1) |
| { |
| if (save_errno == EINTR) |
| continue; |
| |
| fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", |
| safe_strerror (save_errno)); |
| |
| /* Claim it exited with unknown signal. */ |
| ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| return pid_to_ptid (-1); |
| } |
| |
| /* Did it exit? |
| */ |
| if (target_has_exited (pid, status, &exit_status)) |
| { |
| /* ??rehrauer: For now, ignore this. */ |
| continue; |
| } |
| |
| if (!target_thread_alive (pid_to_ptid (pid))) |
| { |
| ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| return pid_to_ptid (pid); |
| } |
| |
| if (hpux_has_forked (pid, &related_pid)) |
| { |
| /* Ignore the parent's fork event. */ |
| if (pid == PIDGET (inferior_ptid)) |
| { |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return inferior_ptid; |
| } |
| |
| /* If this is the child's fork event, report that the |
| process has forked. */ |
| if (related_pid == PIDGET (inferior_ptid)) |
| { |
| ourstatus->kind = TARGET_WAITKIND_FORKED; |
| ourstatus->value.related_pid = pid; |
| return inferior_ptid; |
| } |
| } |
| |
| if (hpux_has_vforked (pid, &related_pid)) |
| { |
| if (pid == PIDGET (inferior_ptid)) |
| { |
| if (saved_vfork_state == STATE_GOT_CHILD) |
| saved_vfork_state = STATE_GOT_PARENT; |
| else if (saved_vfork_state == STATE_GOT_EXEC) |
| saved_vfork_state = STATE_FAKE_EXEC; |
| else |
| fprintf_unfiltered (gdb_stdout, |
| "hppah: parent vfork: confused\n"); |
| } |
| else if (related_pid == PIDGET (inferior_ptid)) |
| { |
| if (saved_vfork_state == STATE_NONE) |
| saved_vfork_state = STATE_GOT_CHILD; |
| else |
| fprintf_unfiltered (gdb_stdout, |
| "hppah: child vfork: confused\n"); |
| } |
| else |
| fprintf_unfiltered (gdb_stdout, |
| "hppah: unknown vfork: confused\n"); |
| |
| if (saved_vfork_state == STATE_GOT_CHILD) |
| { |
| child_post_startup_inferior (pid_to_ptid (pid)); |
| detach_breakpoints (pid); |
| #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
| SOLIB_REMOVE_INFERIOR_HOOK (pid); |
| #endif |
| child_resume (pid_to_ptid (pid), 0, TARGET_SIGNAL_0); |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return pid_to_ptid (related_pid); |
| } |
| else if (saved_vfork_state == STATE_FAKE_EXEC) |
| { |
| ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| ourstatus->value.related_pid = related_pid; |
| return pid_to_ptid (pid); |
| } |
| else |
| { |
| /* We saw the parent's vfork, but we haven't seen the exec yet. |
| Wait for it, for simplicity's sake. It should be pending. */ |
| saved_vfork_pid = related_pid; |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return pid_to_ptid (pid); |
| } |
| } |
| |
| if (hpux_has_execd (pid, &execd_pathname)) |
| { |
| /* On HP-UX, events associated with a vforking inferior come in |
| threes: a vfork event for the child (always first), followed |
| a vfork event for the parent and an exec event for the child. |
| The latter two can come in either order. Make sure we get |
| both. */ |
| if (saved_vfork_state != STATE_NONE) |
| { |
| if (saved_vfork_state == STATE_GOT_CHILD) |
| { |
| saved_vfork_state = STATE_GOT_EXEC; |
| /* On HP/UX with ptrace, the child must be resumed before |
| the parent vfork event is delivered. A single-step |
| suffices. */ |
| if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) |
| target_resume (pid_to_ptid (pid), 1, TARGET_SIGNAL_0); |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| } |
| else if (saved_vfork_state == STATE_GOT_PARENT) |
| { |
| saved_vfork_state = STATE_FAKE_EXEC; |
| ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| ourstatus->value.related_pid = saved_vfork_pid; |
| } |
| else |
| fprintf_unfiltered (gdb_stdout, |
| "hppa: exec: unexpected state\n"); |
| |
| saved_child_execd_pathname = execd_pathname; |
| |
| return inferior_ptid; |
| } |
| |
| /* Are we ignoring initial exec events? (This is likely because |
| we're in the process of starting up the inferior, and another |
| (older) mechanism handles those.) If so, we'll report this |
| as a regular stop, not an exec. |
| */ |
| if (inferior_ignoring_startup_exec_events) |
| { |
| inferior_ignoring_startup_exec_events--; |
| } |
| else |
| { |
| ourstatus->kind = TARGET_WAITKIND_EXECD; |
| ourstatus->value.execd_pathname = execd_pathname; |
| return pid_to_ptid (pid); |
| } |
| } |
| |
| /* All we must do with these is communicate their occurrence |
| to wait_for_inferior... |
| */ |
| if (hpux_has_syscall_event (pid, &kind, &syscall_id)) |
| { |
| ourstatus->kind = kind; |
| ourstatus->value.syscall_id = syscall_id; |
| return pid_to_ptid (pid); |
| } |
| |
| /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ |
| /* hack for thread testing */ |
| } |
| while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); |
| /*## */ |
| |
| store_waitstatus (ourstatus, status); |
| return pid_to_ptid (pid); |
| } |
| |
| #if !defined (GDB_NATIVE_HPUX_11) |
| |
| /* The following code is a substitute for the infttrace.c versions used |
| with ttrace() in HPUX 11. */ |
| |
| /* This value is an arbitrary integer. */ |
| #define PT_VERSION 123456 |
| |
| /* This semaphore is used to coordinate the child and parent processes |
| after a fork(), and before an exec() by the child. See |
| parent_attach_all for details. */ |
| |
| typedef struct |
| { |
| int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ |
| int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ |
| } |
| startup_semaphore_t; |
| |
| #define SEM_TALK (1) |
| #define SEM_LISTEN (0) |
| |
| static startup_semaphore_t startup_semaphore; |
| |
| #ifdef PT_SETTRC |
| /* This function causes the caller's process to be traced by its |
| parent. This is intended to be called after GDB forks itself, |
| and before the child execs the target. |
| |
| Note that HP-UX ptrace is rather funky in how this is done. |
| If the parent wants to get the initial exec event of a child, |
| it must set the ptrace event mask of the child to include execs. |
| (The child cannot do this itself.) This must be done after the |
| child is forked, but before it execs. |
| |
| To coordinate the parent and child, we implement a semaphore using |
| pipes. After SETTRC'ing itself, the child tells the parent that |
| it is now traceable by the parent, and waits for the parent's |
| acknowledgement. The parent can then set the child's event mask, |
| and notify the child that it can now exec. |
| |
| (The acknowledgement by parent happens as a result of a call to |
| child_acknowledge_created_inferior.) */ |
| |
| int |
| parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
| { |
| int pt_status = 0; |
| |
| /* We need a memory home for a constant. */ |
| int tc_magic_child = PT_VERSION; |
| int tc_magic_parent = 0; |
| |
| /* The remainder of this function is only useful for HPUX 10.0 and |
| later, as it depends upon the ability to request notification |
| of specific kinds of events by the kernel. */ |
| #if defined(PT_SET_EVENT_MASK) |
| |
| /* Notify the parent that we're potentially ready to exec(). */ |
| write (startup_semaphore.child_channel[SEM_TALK], |
| &tc_magic_child, |
| sizeof (tc_magic_child)); |
| |
| /* Wait for acknowledgement from the parent. */ |
| read (startup_semaphore.parent_channel[SEM_LISTEN], |
| &tc_magic_parent, |
| sizeof (tc_magic_parent)); |
| if (tc_magic_child != tc_magic_parent) |
| warning ("mismatched semaphore magic"); |
| |
| /* Discard our copy of the semaphore. */ |
| (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| #endif |
| |
| return 0; |
| } |
| #endif |
| |
| int |
| hppa_require_attach (int pid) |
| { |
| int pt_status; |
| CORE_ADDR pc; |
| CORE_ADDR pc_addr; |
| unsigned int regs_offset; |
| |
| /* Are we already attached? There appears to be no explicit way to |
| answer this via ptrace, so we try something which should be |
| innocuous if we are attached. If that fails, then we assume |
| we're not attached, and so attempt to make it so. */ |
| |
| errno = 0; |
| regs_offset = U_REGS_OFFSET; |
| pc_addr = register_addr (PC_REGNUM, regs_offset); |
| pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); |
| |
| if (errno) |
| { |
| errno = 0; |
| pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); |
| |
| if (errno) |
| return -1; |
| |
| /* Now we really are attached. */ |
| errno = 0; |
| } |
| attach_flag = 1; |
| return pid; |
| } |
| |
| int |
| hppa_require_detach (int pid, int signal) |
| { |
| errno = 0; |
| call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); |
| errno = 0; /* Ignore any errors. */ |
| return pid; |
| } |
| |
| /* Since ptrace doesn't support memory page-protection events, which |
| are used to implement "hardware" watchpoints on HP-UX, these are |
| dummy versions, which perform no useful work. */ |
| |
| void |
| hppa_enable_page_protection_events (int pid) |
| { |
| } |
| |
| void |
| hppa_disable_page_protection_events (int pid) |
| { |
| } |
| |
| int |
| hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| int |
| hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| int |
| hppa_can_use_hw_watchpoint (int type, int cnt, int ot) |
| { |
| return 0; |
| } |
| |
| int |
| hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| char * |
| hppa_pid_or_tid_to_str (ptid_t id) |
| { |
| /* In the ptrace world, there are only processes. */ |
| return child_pid_to_str (id); |
| } |
| |
| /* This function has no meaning in a non-threaded world. Thus, we |
| return 0 (FALSE). See the use of "hppa_prepare_to_proceed" in |
| hppa-tdep.c. */ |
| |
| pid_t |
| hppa_switched_threads (pid_t pid) |
| { |
| return (pid_t) 0; |
| } |
| |
| void |
| hppa_ensure_vforking_parent_remains_stopped (int pid) |
| { |
| /* This assumes that the vforked parent is presently stopped, and |
| that the vforked child has just delivered its first exec event. |
| Calling kill() this way will cause the SIGTRAP to be delivered as |
| soon as the parent is resumed, which happens as soon as the |
| vforked child is resumed. See wait_for_inferior for the use of |
| this function. */ |
| kill (pid, SIGTRAP); |
| } |
| |
| int |
| hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
| { |
| return 1; /* Yes, the child must be resumed. */ |
| } |
| |
| void |
| require_notification_of_events (int pid) |
| { |
| #if defined(PT_SET_EVENT_MASK) |
| int pt_status; |
| ptrace_event_t ptrace_events; |
| int nsigs; |
| int signum; |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. (This support does not exist before HPUX 10.0. |
| We'll assume if PT_SET_EVENT_MASK has not been defined by |
| <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
| memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| |
| /* Note: By default, all signals are visible to us. If we wish |
| the kernel to keep certain signals hidden from us, we do it |
| by calling sigdelset (ptrace_events.pe_signals, signal) for |
| each such signal here, before doing PT_SET_EVENT_MASK. */ |
| /* RM: The above comment is no longer true. We start with ignoring |
| all signals, and then add the ones we are interested in. We could |
| do it the other way: start by looking at all signals and then |
| deleting the ones that we aren't interested in, except that |
| multiple gdb signals may be mapped to the same host signal |
| (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to |
| signal 22 on HPUX 10.20) We want to be notified if we are |
| interested in either signal. */ |
| sigfillset (&ptrace_events.pe_signals); |
| |
| /* RM: Let's not bother with signals we don't care about */ |
| nsigs = (int) TARGET_SIGNAL_LAST; |
| for (signum = nsigs; signum > 0; signum--) |
| { |
| if ((signal_stop_state (signum)) || |
| (signal_print_state (signum)) || |
| (!signal_pass_state (signum))) |
| { |
| if (target_signal_to_host_p (signum)) |
| sigdelset (&ptrace_events.pe_signals, |
| target_signal_to_host (signum)); |
| } |
| } |
| |
| ptrace_events.pe_set_event = 0; |
| |
| ptrace_events.pe_set_event |= PTRACE_SIGNAL; |
| ptrace_events.pe_set_event |= PTRACE_EXEC; |
| ptrace_events.pe_set_event |= PTRACE_FORK; |
| ptrace_events.pe_set_event |= PTRACE_VFORK; |
| /* ??rehrauer: Add this one when we're prepared to catch it... |
| ptrace_events.pe_set_event |= PTRACE_EXIT; |
| */ |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_events, |
| sizeof (ptrace_events)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return; |
| #endif |
| } |
| |
| void |
| require_notification_of_exec_events (int pid) |
| { |
| #if defined(PT_SET_EVENT_MASK) |
| int pt_status; |
| ptrace_event_t ptrace_events; |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. (This support does not exist before HPUX 10.0. |
| We'll assume if PT_SET_EVENT_MASK has not been defined by |
| <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
| memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| |
| /* Note: By default, all signals are visible to us. If we wish |
| the kernel to keep certain signals hidden from us, we do it |
| by calling sigdelset (ptrace_events.pe_signals, signal) for |
| each such signal here, before doing PT_SET_EVENT_MASK. */ |
| sigemptyset (&ptrace_events.pe_signals); |
| |
| ptrace_events.pe_set_event = 0; |
| |
| ptrace_events.pe_set_event |= PTRACE_EXEC; |
| /* ??rehrauer: Add this one when we're prepared to catch it... |
| ptrace_events.pe_set_event |= PTRACE_EXIT; |
| */ |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_events, |
| sizeof (ptrace_events)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return; |
| #endif |
| } |
| |
| /* This function is called by the parent process, with pid being the |
| ID of the child process, after the debugger has forked. */ |
| |
| void |
| child_acknowledge_created_inferior (int pid) |
| { |
| /* We need a memory home for a constant. */ |
| int tc_magic_parent = PT_VERSION; |
| int tc_magic_child = 0; |
| |
| /* The remainder of this function is only useful for HPUX 10.0 and |
| later, as it depends upon the ability to request notification |
| of specific kinds of events by the kernel. */ |
| #if defined(PT_SET_EVENT_MASK) |
| /* Wait for the child to tell us that it has forked. */ |
| read (startup_semaphore.child_channel[SEM_LISTEN], |
| &tc_magic_child, |
| sizeof (tc_magic_child)); |
| |
| /* Notify the child that it can exec. |
| |
| In the infttrace.c variant of this function, we set the child's |
| event mask after the fork but before the exec. In the ptrace |
| world, it seems we can't set the event mask until after the exec. */ |
| write (startup_semaphore.parent_channel[SEM_TALK], |
| &tc_magic_parent, |
| sizeof (tc_magic_parent)); |
| |
| /* We'd better pause a bit before trying to set the event mask, |
| though, to ensure that the exec has happened. We don't want to |
| wait() on the child, because that'll screw up the upper layers |
| of gdb's execution control that expect to see the exec event. |
| |
| After an exec, the child is no longer executing gdb code. Hence, |
| we can't have yet another synchronization via the pipes. We'll |
| just sleep for a second, and hope that's enough delay... */ |
| sleep (1); |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. */ |
| require_notification_of_exec_events (pid); |
| |
| /* Discard our copy of the semaphore. */ |
| (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| #endif |
| } |
| |
| void |
| child_post_startup_inferior (ptid_t ptid) |
| { |
| require_notification_of_events (PIDGET (ptid)); |
| } |
| |
| void |
| child_post_attach (int pid) |
| { |
| require_notification_of_events (pid); |
| } |
| |
| int |
| child_insert_fork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch forks prior to HPUX 10.0"); |
| #else |
| /* Enable reporting of fork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_fork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch forks prior to HPUX 10.0"); |
| #else |
| /* Disable reporting of fork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_insert_vfork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch vforks prior to HPUX 10.0"); |
| #else |
| /* Enable reporting of vfork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_vfork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch vforks prior to HPUX 10.0"); |
| #else |
| /* Disable reporting of vfork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| hpux_has_forked (int pid, int *childpid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *childpid = 0; |
| return 0; |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_FORK) |
| { |
| *childpid = ptrace_state.pe_other_pid; |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| hpux_has_vforked (int pid, int *childpid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *childpid = 0; |
| return 0; |
| |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_VFORK) |
| { |
| *childpid = ptrace_state.pe_other_pid; |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| child_insert_exec_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch execs prior to HPUX 10.0"); |
| |
| #else |
| /* Enable reporting of exec events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_exec_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch execs prior to HPUX 10.0"); |
| |
| #else |
| /* Disable reporting of exec events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| hpux_has_execd (int pid, char **execd_pathname) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *execd_pathname = NULL; |
| return 0; |
| |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_EXEC) |
| { |
| char *exec_file = target_pid_to_exec_file (pid); |
| *execd_pathname = savestring (exec_file, strlen (exec_file)); |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| child_reported_exec_events_per_exec_call (void) |
| { |
| return 2; /* ptrace reports the event twice per call. */ |
| } |
| |
| int |
| hpux_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
| { |
| /* This request is only available on HPUX 10.30 and later, via |
| the ttrace interface. */ |
| |
| *kind = TARGET_WAITKIND_SPURIOUS; |
| *syscall_id = -1; |
| return 0; |
| } |
| |
| char * |
| child_pid_to_exec_file (int pid) |
| { |
| static char exec_file_buffer[1024]; |
| int pt_status; |
| CORE_ADDR top_of_stack; |
| char four_chars[4]; |
| int name_index; |
| int i; |
| ptid_t saved_inferior_ptid; |
| int done; |
| |
| #ifdef PT_GET_PROCESS_PATHNAME |
| /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ |
| pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, |
| pid, |
| (PTRACE_ARG3_TYPE) exec_file_buffer, |
| sizeof (exec_file_buffer) - 1); |
| if (pt_status == 0) |
| return exec_file_buffer; |
| #endif |
| |
| /* It appears that this request is broken prior to 10.30. |
| If it fails, try a really, truly amazingly gross hack |
| that DDE uses, of pawing through the process' data |
| segment to find the pathname. */ |
| |
| top_of_stack = 0x7b03a000; |
| name_index = 0; |
| done = 0; |
| |
| /* On the chance that pid != inferior_ptid, set inferior_ptid |
| to pid, so that (grrrr!) implicit uses of inferior_ptid get |
| the right id. */ |
| |
| saved_inferior_ptid = inferior_ptid; |
| inferior_ptid = pid_to_ptid (pid); |
| |
| /* Try to grab a null-terminated string. */ |
| while (!done) |
| { |
| if (target_read_memory (top_of_stack, four_chars, 4) != 0) |
| { |
| inferior_ptid = saved_inferior_ptid; |
| return NULL; |
| } |
| for (i = 0; i < 4; i++) |
| { |
| exec_file_buffer[name_index++] = four_chars[i]; |
| done = (four_chars[i] == '\0'); |
| if (done) |
| break; |
| } |
| top_of_stack += 4; |
| } |
| |
| if (exec_file_buffer[0] == '\0') |
| { |
| inferior_ptid = saved_inferior_ptid; |
| return NULL; |
| } |
| |
| inferior_ptid = saved_inferior_ptid; |
| return exec_file_buffer; |
| } |
| |
| void |
| pre_fork_inferior (void) |
| { |
| int status; |
| |
| status = pipe (startup_semaphore.parent_channel); |
| if (status < 0) |
| { |
| warning ("error getting parent pipe for startup semaphore"); |
| return; |
| } |
| |
| status = pipe (startup_semaphore.child_channel); |
| if (status < 0) |
| { |
| warning ("error getting child pipe for startup semaphore"); |
| return; |
| } |
| } |
| |
| |
| /* Check to see if the given thread is alive. |
| |
| This is a no-op, as ptrace doesn't support threads, so we just |
| return "TRUE". */ |
| |
| int |
| child_thread_alive (ptid_t ptid) |
| { |
| return 1; |
| } |
| |
| #endif /* ! GDB_NATIVE_HPUX_11 */ |