diff options
Diffstat (limited to 'gdb/convex-xdep.c')
-rw-r--r-- | gdb/convex-xdep.c | 983 |
1 files changed, 983 insertions, 0 deletions
diff --git a/gdb/convex-xdep.c b/gdb/convex-xdep.c new file mode 100644 index 0000000..f9f44a0 --- /dev/null +++ b/gdb/convex-xdep.c @@ -0,0 +1,983 @@ +/* Convex stuff for GDB. + Copyright (C) 1990-1991 Free Software Foundation, Inc. + +This file is part of GDB. + +GDB 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 1, or (at your option) +any later version. + +GDB 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 GDB; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <stdio.h> +#include "defs.h" +#include "param.h" +#include "command.h" +#include "symtab.h" +#include "value.h" +#include "frame.h" +#include "inferior.h" +#include "wait.h" + +#include <signal.h> +#include <fcntl.h> +#include "gdbcore.h" + +#include <sys/param.h> +#include <sys/dir.h> +#include <sys/user.h> +#include <sys/ioctl.h> +#include <sys/pcntl.h> +#include <sys/thread.h> +#include <sys/proc.h> +#include <sys/file.h> +#include <sys/stat.h> +#include <sys/mman.h> + +#include <convex/vmparam.h> +#include <convex/filehdr.h> +#include <convex/opthdr.h> +#include <convex/scnhdr.h> +#include <convex/core.h> + +/* Per-thread data, read from the inferior at each stop and written + back at each resume. */ + +/* Number of active threads. + Tables are valid for thread numbers less than this. */ + +static int n_threads; + +#define MAXTHREADS 8 + +/* Thread state. The remaining data is valid only if this is PI_TALIVE. */ + +static int thread_state[MAXTHREADS]; + +/* Stop pc, signal, signal subcode */ + +static int thread_pc[MAXTHREADS]; +static int thread_signal[MAXTHREADS]; +static int thread_sigcode[MAXTHREADS]; + +/* Thread registers. + If thread is selected, the regs are in registers[] instead. */ + +static char thread_regs[MAXTHREADS][REGISTER_BYTES]; + +/* 1 if the top frame on the thread's stack was a context frame, + meaning that the kernel is up to something and we should not + touch the thread at all except to resume it. */ + +static char thread_is_in_kernel[MAXTHREADS]; + +/* The currently selected thread's number. */ + +static int inferior_thread; + +/* Inferior process's file handle and a process control block + to feed args to ioctl with. */ + +static int inferior_fd; +static struct pcntl ps; + +/* SOFF file headers for exec or core file. */ + +static FILEHDR filehdr; +static OPTHDR opthdr; +static SCNHDR scnhdr; + +/* Address maps constructed from section headers of exec and core files. + Defines process address -> file address translation. */ + +struct pmap +{ + long mem_addr; /* process start address */ + long mem_end; /* process end+1 address */ + long file_addr; /* file start address */ + long thread; /* -1 shared; 0,1,... thread-local */ + long type; /* S_TEXT S_DATA S_BSS S_TBSS etc */ + long which; /* used to sort map for info files */ +}; + +static int n_exec, n_core; +static struct pmap exec_map[100]; +static struct pmap core_map[100]; + +/* Offsets in the core file of core_context and core_tcontext blocks. */ + +static int context_offset; +static int tcontext_offset[MAXTHREADS]; + +/* Core file control blocks. */ + +static struct core_context_v70 c; +static struct core_tcontext_v70 tc; +static struct user u; +static thread_t th; +static proc_t pr; + +/* The registers of the currently selected thread. */ + +extern char registers[REGISTER_BYTES]; + +/* Vector and communication registers from core dump or from inferior. + These are read on demand, ie, not normally valid. */ + +static struct vecst vector_registers; +static struct creg_ctx comm_registers; + +/* Flag, set on a vanilla CONT command and cleared when the inferior + is continued. */ + +static int all_continue; + +/* Flag, set when the inferior is continued by a vanilla CONT command, + cleared if it is continued for any other purpose. */ + +static int thread_switch_ok; + +/* Stack of signals recieved from threads but not yet delivered to gdb. */ + +struct threadpid +{ + int pid; + int thread; + int signo; + int subsig; + int pc; +}; + +static struct threadpid signal_stack_bot[100]; +static struct threadpid *signal_stack = signal_stack_bot; + +/* How to detect empty stack -- bottom frame is all zero. */ + +#define signal_stack_is_empty() (signal_stack->pid == 0) + +/* Mode controlled by SET PIPE command, controls the psw SEQ bit + which forces each instruction to complete before the next one starts. */ + +static int sequential = 0; + +/* Mode controlled by the SET PARALLEL command. Values are: + 0 concurrency limit 1 thread, dynamic scheduling + 1 no concurrency limit, dynamic scheduling + 2 no concurrency limit, fixed scheduling */ + +static int parallel = 1; + +/* Mode controlled by SET BASE command, output radix for unformatted + integer typeout, as in argument lists, aggregates, and so on. + Zero means guess whether it's an address (hex) or not (decimal). */ + +static int output_radix = 0; + +/* Signal subcode at last thread stop. */ + +static int stop_sigcode; + +/* Hack, see wait() below. */ + +static int exec_trap_timer; + +#include "gdbcmd.h" + +/* Nonzero if we are debugging an attached outside process + rather than an inferior. */ + +extern int attach_flag; + + + +static struct type *vector_type (); +static long *read_vector_register (); +static long *read_vector_register_1 (); +static void write_vector_register (); +static REGISTER_TYPE read_comm_register (); +static void write_comm_register (); +static void convex_cont_command (); +static void thread_continue (); +static void select_thread (); +static void scan_stack (); +static void set_fixed_scheduling (); +static char *subsig_name (); +static void psw_info (); +static sig_noop (); +static ptr_cmp (); + +extern char *sys_siglist[]; + +/* Execute ptrace. Convex V7 replaced ptrace with pattach. + Allow ptrace (0) as a no-op. */ + +int +call_ptrace (request, pid, procaddr, buf) + int request, pid, procaddr, buf; +{ + if (request == 0) + return; + error ("no ptrace"); +} + +/* Replacement for system execle routine. + Convert it to an equivalent exect, which pattach insists on. */ + +execle (name, argv) + char *name, *argv; +{ + char ***envp = (char ***) &argv; + while (*envp++) ; + + signal (SIGTRAP, sig_noop); + exect (name, &argv, *envp); +} + +/* Stupid handler for stupid trace trap that otherwise causes + startup to stupidly hang. */ + +static sig_noop () +{} + +/* Read registers from inferior into registers[] array. + For convex, they are already there, read in when the inferior stops. */ + +void +fetch_inferior_registers (regno) + int regno; +{ +} + +/* Store our register values back into the inferior. + For Convex, do this only once, right before resuming inferior. */ + +store_inferior_registers (regno) + int regno; +{ +} + +/* Copy LEN bytes from inferior's memory starting at MEMADDR + to debugger memory starting at MYADDR. + On failure (cannot read from inferior, usually because address is out + of bounds) returns the value of errno. */ + +int +read_inferior_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + errno = 0; + while (len > 0) + { + /* little-known undocumented max request size */ + int i = (len < 12288) ? len : 12288; + + lseek (inferior_fd, memaddr, 0); + read (inferior_fd, myaddr, i); + + memaddr += i; + myaddr += i; + len -= i; + } + if (errno) + bzero (myaddr, len); + return errno; +} + +/* Copy LEN bytes of data from debugger memory at MYADDR + to inferior's memory at MEMADDR. + Returns errno on failure (cannot write the inferior) */ + +int +write_inferior_memory (memaddr, myaddr, len) + CORE_ADDR memaddr; + char *myaddr; + int len; +{ + errno = 0; + lseek (inferior_fd, memaddr, 0); + write (inferior_fd, myaddr, len); + return errno; +} + +/* Here from create_inferior when the inferior process has been created + and started up. We must do a pattach to grab it for debugging. + + Also, intercept the CONT command by altering its dispatch address. */ + +create_inferior_hook (pid) + int pid; +{ + static char cont[] = "cont"; + static char cont1[] = "c"; + char *linep = cont; + char *linep1 = cont1; + char **line = &linep; + char **line1 = &linep1; + struct cmd_list_element *c; + + c = lookup_cmd (line, cmdlist, "", 0); + c->function = convex_cont_command; + c = lookup_cmd (line1, cmdlist, "", 0); + c->function = convex_cont_command; + + inferior_fd = pattach (pid, O_EXCL); + if (inferior_fd < 0) + perror_with_name ("pattach"); + inferior_thread = 0; + set_fixed_scheduling (pid, parallel == 2); +} + +/* Attach process PID for debugging. */ + +attach (pid) + int pid; +{ + int fd = pattach (pid, O_EXCL); + if (fd < 0) + perror_with_name ("pattach"); + attach_flag = 1; + /* wait for strange kernel reverberations to go away */ + sleep (1); + + setpgrp (pid, pid); + + inferior_fd = fd; + inferior_thread = 0; + return pid; +} + +/* Stop debugging the process whose number is PID + and continue it with signal number SIGNAL. + SIGNAL = 0 means just continue it. */ + +void +detach (signal) + int signal; +{ + signal_stack = signal_stack_bot; + thread_continue (-1, 0, signal); + ioctl (inferior_fd, PIXDETACH, &ps); + close (inferior_fd); + inferior_fd = 0; + attach_flag = 0; +} + +/* Kill off the inferior process. */ + +kill_inferior () +{ + if (inferior_pid == 0) + return; + ioctl (inferior_fd, PIXTERMINATE, 0); + wait (0); + target_mourn_inferior (); +} + +/* This is used when GDB is exiting. It gives less chance of error.*/ + +kill_inferior_fast () +{ + if (inferior_pid == 0) + return; + ioctl (inferior_fd, PIXTERMINATE, 0); + wait (0); +} + +/* Read vector register REG, and return a pointer to the value. */ + +static long * +read_vector_register (reg) + int reg; +{ + if (have_inferior_p ()) + { + errno = 0; + ps.pi_buffer = (char *) &vector_registers; + ps.pi_nbytes = sizeof vector_registers; + ps.pi_offset = 0; + ps.pi_thread = inferior_thread; + ioctl (inferior_fd, PIXRDVREGS, &ps); + if (errno) + bzero (&vector_registers, sizeof vector_registers); + } + else if (corechan >= 0) + { + lseek (corechan, tcontext_offset[inferior_thread], 0); + if (myread (corechan, &tc, sizeof tc) < 0) + perror_with_name (corefile); + lseek (corechan, tc.core_thread_p, 0); + if (myread (corechan, &th, sizeof th) < 0) + perror_with_name (corefile); + lseek (corechan, tc.core_vregs_p, 0); + if (myread (corechan, &vector_registers, 16*128) < 0) + perror_with_name (corefile); + vector_registers.vm[0] = th.t_vect_ctx.vc_vm[0]; + vector_registers.vm[1] = th.t_vect_ctx.vc_vm[1]; + vector_registers.vls = th.t_vect_ctx.vc_vls; + } + + return read_vector_register_1 (reg); +} + +/* Return a pointer to vector register REG, which must already have been + fetched from the inferior or core file. */ + +static long * +read_vector_register_1 (reg) + int reg; +{ + switch (reg) + { + case VM_REGNUM: + return (long *) vector_registers.vm; + case VS_REGNUM: + return (long *) &vector_registers.vls; + case VL_REGNUM: + return 1 + (long *) &vector_registers.vls; + default: + return (long *) &vector_registers.vr[reg]; + } +} + +/* Write vector register REG, element ELEMENT, new value VAL. + NB: must use read-modify-write on the entire vector state, + since pattach does not do offsetted writes correctly. */ + +static void +write_vector_register (reg, element, val) + int reg, element; + REGISTER_TYPE val; +{ + if (have_inferior_p ()) + { + errno = 0; + ps.pi_thread = inferior_thread; + ps.pi_offset = 0; + ps.pi_buffer = (char *) &vector_registers; + ps.pi_nbytes = sizeof vector_registers; + + ioctl (inferior_fd, PIXRDVREGS, &ps); + + switch (reg) + { + case VL_REGNUM: + vector_registers.vls = + (vector_registers.vls & 0xffffffff00000000LL) + + (unsigned long) val; + break; + + case VS_REGNUM: + vector_registers.vls = + (val << 32) + (unsigned long) vector_registers.vls; + break; + + default: + vector_registers.vr[reg].el[element] = val; + break; + } + + ioctl (inferior_fd, PIXWRVREGS, &ps); + + if (errno) + perror_with_name ("writing vector register"); + } +} + +/* Return the contents of communication register NUM. */ + +static REGISTER_TYPE +read_comm_register (num) + int num; +{ + if (have_inferior_p ()) + { + ps.pi_buffer = (char *) &comm_registers; + ps.pi_nbytes = sizeof comm_registers; + ps.pi_offset = 0; + ps.pi_thread = inferior_thread; + ioctl (inferior_fd, PIXRDCREGS, &ps); + } + return comm_registers.crreg.r4[num]; +} + +/* Store a new value VAL into communication register NUM. + NB: Must use read-modify-write on the whole comm register set + since pattach does not do offsetted writes correctly. */ + +static void +write_comm_register (num, val) + int num; + REGISTER_TYPE val; +{ + if (have_inferior_p ()) + { + ps.pi_buffer = (char *) &comm_registers; + ps.pi_nbytes = sizeof comm_registers; + ps.pi_offset = 0; + ps.pi_thread = inferior_thread; + ioctl (inferior_fd, PIXRDCREGS, &ps); + comm_registers.crreg.r4[num] = val; + ioctl (inferior_fd, PIXWRCREGS, &ps); + } +} + +/* Resume execution of the inferior process. + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. */ + +void +resume (step, signal) + int step; + int signal; +{ + errno = 0; + if (step || signal) + thread_continue (inferior_thread, step, signal); + else + thread_continue (-1, 0, 0); +} + +/* Maybe resume some threads. + THREAD is which thread to resume, or -1 to resume them all. + STEP and SIGNAL are as in resume. + + Global variable ALL_CONTINUE is set when we are here to do a + `cont' command; otherwise we may be doing `finish' or a call or + something else that will not tolerate an automatic thread switch. + + If there are stopped threads waiting to deliver signals, and + ALL_CONTINUE, do not actually resume anything. gdb will do a wait + and see one of the stopped threads in the queue. */ + +static void +thread_continue (thread, step, signal) + int thread, step, signal; +{ + int n; + + /* If we are to continue all threads, but not for the CONTINUE command, + pay no attention and continue only the selected thread. */ + + if (thread < 0 && ! all_continue) + thread = inferior_thread; + + /* If we are not stepping, we have now executed the continue part + of a CONTINUE command. */ + + if (! step) + all_continue = 0; + + /* Allow wait() to switch threads if this is an all-out continue. */ + + thread_switch_ok = thread < 0; + + /* If there are threads queued up, don't resume. */ + + if (thread_switch_ok && ! signal_stack_is_empty ()) + return; + + /* OK, do it. */ + + for (n = 0; n < n_threads; n++) + if (thread_state[n] == PI_TALIVE) + { + select_thread (n); + + if ((thread < 0 || n == thread) && ! thread_is_in_kernel[n]) + { + /* Blam the trace bits in the stack's saved psws to match + the desired step mode. This is required so that + single-stepping a return doesn't restore a psw with a + clear trace bit and fly away, and conversely, + proceeding through a return in a routine that was + stepped into doesn't cause a phantom break by restoring + a psw with the trace bit set. */ + scan_stack (PSW_T_BIT, step); + scan_stack (PSW_S_BIT, sequential); + } + + ps.pi_buffer = registers; + ps.pi_nbytes = REGISTER_BYTES; + ps.pi_offset = 0; + ps.pi_thread = n; + if (! thread_is_in_kernel[n]) + if (ioctl (inferior_fd, PIXWRREGS, &ps)) + perror_with_name ("PIXWRREGS"); + + if (thread < 0 || n == thread) + { + ps.pi_pc = 1; + ps.pi_signo = signal; + if (ioctl (inferior_fd, step ? PIXSTEP : PIXCONTINUE, &ps) < 0) + perror_with_name ("PIXCONTINUE"); + } + } + + if (ioctl (inferior_fd, PIXRUN, &ps) < 0) + perror_with_name ("PIXRUN"); +} + +/* Replacement for system wait routine. + + The system wait returns with one or more threads stopped by + signals. Put stopped threads on a stack and return them one by + one, so that it appears that wait returns one thread at a time. + + Global variable THREAD_SWITCH_OK is set when gdb can tolerate wait + returning a new thread. If it is false, then only one thread is + running; we will do a real wait, the thread will do something, and + we will return that. */ + +pid_t +wait (w) + union wait *w; +{ + int pid; + + if (!w) + return wait3 (0, 0, 0); + + /* Do a real wait if we were told to, or if there are no queued threads. */ + + if (! thread_switch_ok || signal_stack_is_empty ()) + { + int thread; + + pid = wait3 (w, 0, 0); + + if (!WIFSTOPPED (*w) || pid != inferior_pid) + return pid; + + /* The inferior has done something and stopped. Read in all the + threads' registers, and queue up any signals that happened. */ + + if (ioctl (inferior_fd, PIXGETTHCOUNT, &ps) < 0) + perror_with_name ("PIXGETTHCOUNT"); + + n_threads = ps.pi_othdcnt; + for (thread = 0; thread < n_threads; thread++) + { + ps.pi_thread = thread; + if (ioctl (inferior_fd, PIXGETSUBCODE, &ps) < 0) + perror_with_name ("PIXGETSUBCODE"); + thread_state[thread] = ps.pi_otstate; + + if (ps.pi_otstate == PI_TALIVE) + { + select_thread (thread); + ps.pi_buffer = registers; + ps.pi_nbytes = REGISTER_BYTES; + ps.pi_offset = 0; + ps.pi_thread = thread; + if (ioctl (inferior_fd, PIXRDREGS, &ps) < 0) + perror_with_name ("PIXRDREGS"); + + registers_fetched (); + + thread_pc[thread] = read_pc (); + thread_signal[thread] = ps.pi_osigno; + thread_sigcode[thread] = ps.pi_osigcode; + + /* If the thread's stack has a context frame + on top, something fucked is going on. I do not + know what, but do I know this: the only thing you + can do with such a thread is continue it. */ + + thread_is_in_kernel[thread] = + ((read_register (PS_REGNUM) >> 25) & 3) == 0; + + /* Signals push an extended frame and then fault + with a ridiculous pc. Pop the frame. */ + + if (thread_pc[thread] > STACK_END_ADDR) + { + POP_FRAME; + if (is_break_pc (thread_pc[thread])) + thread_pc[thread] = read_pc () - 2; + else + thread_pc[thread] = read_pc (); + write_register (PC_REGNUM, thread_pc[thread]); + } + + if (ps.pi_osigno || ps.pi_osigcode) + { + signal_stack++; + signal_stack->pid = pid; + signal_stack->thread = thread; + signal_stack->signo = thread_signal[thread]; + signal_stack->subsig = thread_sigcode[thread]; + signal_stack->pc = thread_pc[thread]; + } + + /* The following hackery is caused by a unix 7.1 feature: + the inferior's fixed scheduling mode is cleared when + it execs the shell (since the shell is not a parallel + program). So, note the 5.4 trap we get when + the shell does its exec, then catch the 5.0 trap + that occurs when the debuggee starts, and set fixed + scheduling mode properly. */ + + if (ps.pi_osigno == 5 && ps.pi_osigcode == 4) + exec_trap_timer = 1; + else + exec_trap_timer--; + + if (ps.pi_osigno == 5 && exec_trap_timer == 0) + set_fixed_scheduling (pid, parallel == 2); + } + } + + if (signal_stack_is_empty ()) + error ("no active threads?!"); + } + + /* Select the thread that stopped, and return *w saying why. */ + + select_thread (signal_stack->thread); + + stop_signal = signal_stack->signo; + stop_sigcode = signal_stack->subsig; + + WSETSTOP (*w, signal_stack->signo); + w->w_thread = signal_stack->thread; + return (signal_stack--)->pid; +} + +/* Select thread THREAD -- its registers, stack, per-thread memory. + This is the only routine that may assign to inferior_thread + or thread_regs[]. */ + +static void +select_thread (thread) + int thread; +{ + if (thread == inferior_thread) + return; + + bcopy (registers, thread_regs[inferior_thread], REGISTER_BYTES); + ps.pi_thread = inferior_thread = thread; + if (have_inferior_p ()) + ioctl (inferior_fd, PISETRWTID, &ps); + bcopy (thread_regs[thread], registers, REGISTER_BYTES); +} + +/* Routine to set or clear a psw bit in the psw and also all psws + saved on the stack. Quits when we get to a frame in which the + saved psw is correct. */ + +static void +scan_stack (bit, val) + long bit, val; +{ + long ps = read_register (PS_REGNUM); + long fp; + if (val ? !(ps & bit) : (ps & bit)) + { + ps ^= bit; + write_register (PS_REGNUM, ps); + + fp = read_register (FP_REGNUM); + while (fp & 0x80000000) + { + ps = read_memory_integer (fp + 4, 4); + if (val ? (ps & bit) : !(ps & bit)) + break; + ps ^= bit; + write_memory (fp + 4, &ps, 4); + fp = read_memory_integer (fp + 8, 4); + } + } +} + +/* Set fixed scheduling (alliant mode) of process PID to ARG (0 or 1). */ + +static void +set_fixed_scheduling (pid, arg) + int arg; +{ + struct pattributes pattr; + getpattr (pid, &pattr); + pattr.pattr_pfixed = arg; + setpattr (pid, &pattr); +} + +void +core_file_command (filename, from_tty) + char *filename; + int from_tty; +{ + int n; + + /* Discard all vestiges of any previous core file + and mark data and stack spaces as empty. */ + + if (corefile) + free (corefile); + corefile = 0; + + if (corechan >= 0) + close (corechan); + corechan = -1; + + data_start = 0; + data_end = 0; + stack_start = STACK_END_ADDR; + stack_end = STACK_END_ADDR; + n_core = 0; + + /* Now, if a new core file was specified, open it and digest it. */ + + if (filename) + { + filename = tilde_expand (filename); + make_cleanup (free, filename); + + if (have_inferior_p ()) + error ("To look at a core file, you must kill the inferior with \"kill\"."); + corechan = open (filename, O_RDONLY, 0); + if (corechan < 0) + perror_with_name (filename); + + if (myread (corechan, &filehdr, sizeof filehdr) < 0) + perror_with_name (filename); + + if (!IS_CORE_SOFF_MAGIC (filehdr.h_magic)) + error ("%s: not a core file.\n", filename); + + if (myread (corechan, &opthdr, filehdr.h_opthdr) < 0) + perror_with_name (filename); + + /* Read through the section headers. + For text, data, etc, record an entry in the core file map. + For context and tcontext, record the file address of + the context blocks. */ + + lseek (corechan, (long) filehdr.h_scnptr, 0); + + n_threads = 0; + for (n = 0; n < filehdr.h_nscns; n++) + { + if (myread (corechan, &scnhdr, sizeof scnhdr) < 0) + perror_with_name (filename); + if ((scnhdr.s_flags & S_TYPMASK) >= S_TEXT + && (scnhdr.s_flags & S_TYPMASK) <= S_COMON) + { + core_map[n_core].mem_addr = scnhdr.s_vaddr; + core_map[n_core].mem_end = scnhdr.s_vaddr + scnhdr.s_size; + core_map[n_core].file_addr = scnhdr.s_scnptr; + core_map[n_core].type = scnhdr.s_flags & S_TYPMASK; + if (core_map[n_core].type != S_TBSS + && core_map[n_core].type != S_TDATA + && core_map[n_core].type != S_TTEXT) + core_map[n_core].thread = -1; + else if (n_core == 0 + || core_map[n_core-1].mem_addr != scnhdr.s_vaddr) + core_map[n_core].thread = 0; + else + core_map[n_core].thread = core_map[n_core-1].thread + 1; + n_core++; + } + else if ((scnhdr.s_flags & S_TYPMASK) == S_CONTEXT) + context_offset = scnhdr.s_scnptr; + else if ((scnhdr.s_flags & S_TYPMASK) == S_TCONTEXT) + tcontext_offset[n_threads++] = scnhdr.s_scnptr; + } + + /* Read the context block, struct user, struct proc, + and the comm regs. */ + + lseek (corechan, context_offset, 0); + if (myread (corechan, &c, sizeof c) < 0) + perror_with_name (filename); + lseek (corechan, c.core_user_p, 0); + if (myread (corechan, &u, sizeof u) < 0) + perror_with_name (filename); + lseek (corechan, c.core_proc_p, 0); + if (myread (corechan, &pr, sizeof pr) < 0) + perror_with_name (filename); + comm_registers = pr.p_creg; + + /* Core file apparently is really there. Make it really exist + for xfer_core_file so we can do read_memory on it. */ + + if (filename[0] == '/') + corefile = savestring (filename, strlen (filename)); + else + corefile = concat (current_directory, "/", filename); + + printf_filtered ("Program %s ", u.u_comm); + + /* Read the thread registers and fill in the thread_xxx[] data. */ + + for (n = 0; n < n_threads; n++) + { + select_thread (n); + + lseek (corechan, tcontext_offset[n], 0); + if (myread (corechan, &tc, sizeof tc) < 0) + perror_with_name (corefile); + lseek (corechan, tc.core_thread_p, 0); + if (myread (corechan, &th, sizeof th) < 0) + perror_with_name (corefile); + + lseek (corechan, tc.core_syscall_context_p, 0); + if (myread (corechan, registers, REGISTER_BYTES) < 0) + perror_with_name (corefile); + + thread_signal[n] = th.t_cursig; + thread_sigcode[n] = th.t_code; + thread_state[n] = th.t_state; + thread_pc[n] = read_pc (); + + if (thread_pc[n] > STACK_END_ADDR) + { + POP_FRAME; + if (is_break_pc (thread_pc[n])) + thread_pc[n] = read_pc () - 2; + else + thread_pc[n] = read_pc (); + write_register (PC_REGNUM, thread_pc[n]); + } + + printf_filtered ("thread %d received signal %d, %s\n", + n, thread_signal[n], + thread_signal[n] < NSIG + ? sys_siglist[thread_signal[n]] + : "(undocumented)"); + } + + /* Select an interesting thread -- also-rans died with SIGKILL, + so find one that didn't. */ + + for (n = 0; n < n_threads; n++) + if (thread_signal[n] != 0 && thread_signal[n] != SIGKILL) + { + select_thread (n); + stop_signal = thread_signal[n]; + stop_sigcode = thread_sigcode[n]; + break; + } + + core_aouthdr.a_magic = 0; + + flush_cached_frames (); + set_current_frame (create_new_frame (read_register (FP_REGNUM), + read_pc ())); + select_frame (get_current_frame (), 0); + validate_files (); + + print_sel_frame (1); + } + else if (from_tty) + printf_filtered ("No core file now.\n"); +} |