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- /* Sequent Symmetry host interface, for GDB when running under Unix.
- Copyright 1986, 1987, 1989, 1991, 1992, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* FIXME, some 387-specific items of use taken from i387-tdep.c -- ought to be
- merged back in. */
-
- #include "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "symtab.h"
- #include "target.h"
-
- /* FIXME: What is the _INKERNEL define for? */
- #define _INKERNEL
- #include <signal.h>
- #undef _INKERNEL
- #include <sys/wait.h>
- #include <sys/param.h>
- #include <sys/user.h>
- #include <sys/proc.h>
- #include <sys/dir.h>
- #include <sys/ioctl.h>
- #include <sys/stat.h>
- #ifdef _SEQUENT_
- #include <sys/ptrace.h>
- #else
- /* Dynix has only machine/ptrace.h, which is already included by sys/user.h */
- /* Dynix has no mptrace call */
- #define mptrace ptrace
- #endif
- #include "gdbcore.h"
- #include <fcntl.h>
- #include <sgtty.h>
- #define TERMINAL struct sgttyb
-
- #include "gdbcore.h"
-
- void
- store_inferior_registers(regno)
- int regno;
- {
- struct pt_regset regs;
- int i;
- extern char registers[];
-
- /* FIXME: Fetching the registers is a kludge to initialize all elements
- in the fpu and fpa status. This works for normal debugging, but
- might cause problems when calling functions in the inferior.
- At least fpu_control and fpa_pcr (probably more) should be added
- to the registers array to solve this properly. */
- mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
-
- regs.pr_eax = *(int *)®isters[REGISTER_BYTE(0)];
- regs.pr_ebx = *(int *)®isters[REGISTER_BYTE(5)];
- regs.pr_ecx = *(int *)®isters[REGISTER_BYTE(2)];
- regs.pr_edx = *(int *)®isters[REGISTER_BYTE(1)];
- regs.pr_esi = *(int *)®isters[REGISTER_BYTE(6)];
- regs.pr_edi = *(int *)®isters[REGISTER_BYTE(7)];
- regs.pr_esp = *(int *)®isters[REGISTER_BYTE(14)];
- regs.pr_ebp = *(int *)®isters[REGISTER_BYTE(15)];
- regs.pr_eip = *(int *)®isters[REGISTER_BYTE(16)];
- regs.pr_flags = *(int *)®isters[REGISTER_BYTE(17)];
- for (i = 0; i < 31; i++)
- {
- regs.pr_fpa.fpa_regs[i] =
- *(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)];
- }
- memcpy (regs.pr_fpu.fpu_stack[0], ®isters[REGISTER_BYTE(ST0_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[1], ®isters[REGISTER_BYTE(ST1_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[2], ®isters[REGISTER_BYTE(ST2_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[3], ®isters[REGISTER_BYTE(ST3_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[4], ®isters[REGISTER_BYTE(ST4_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[5], ®isters[REGISTER_BYTE(ST5_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[6], ®isters[REGISTER_BYTE(ST6_REGNUM)], 10);
- memcpy (regs.pr_fpu.fpu_stack[7], ®isters[REGISTER_BYTE(ST7_REGNUM)], 10);
- mptrace (XPT_WREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
- }
-
- void
- fetch_inferior_registers (regno)
- int regno;
- {
- int i;
- struct pt_regset regs;
- extern char registers[];
-
- registers_fetched ();
-
- mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
- *(int *)®isters[REGISTER_BYTE(EAX_REGNUM)] = regs.pr_eax;
- *(int *)®isters[REGISTER_BYTE(EBX_REGNUM)] = regs.pr_ebx;
- *(int *)®isters[REGISTER_BYTE(ECX_REGNUM)] = regs.pr_ecx;
- *(int *)®isters[REGISTER_BYTE(EDX_REGNUM)] = regs.pr_edx;
- *(int *)®isters[REGISTER_BYTE(ESI_REGNUM)] = regs.pr_esi;
- *(int *)®isters[REGISTER_BYTE(EDI_REGNUM)] = regs.pr_edi;
- *(int *)®isters[REGISTER_BYTE(EBP_REGNUM)] = regs.pr_ebp;
- *(int *)®isters[REGISTER_BYTE(ESP_REGNUM)] = regs.pr_esp;
- *(int *)®isters[REGISTER_BYTE(EIP_REGNUM)] = regs.pr_eip;
- *(int *)®isters[REGISTER_BYTE(EFLAGS_REGNUM)] = regs.pr_flags;
- for (i = 0; i < FPA_NREGS; i++)
- {
- *(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)] =
- regs.pr_fpa.fpa_regs[i];
- }
- memcpy (®isters[REGISTER_BYTE(ST0_REGNUM)], regs.pr_fpu.fpu_stack[0], 10);
- memcpy (®isters[REGISTER_BYTE(ST1_REGNUM)], regs.pr_fpu.fpu_stack[1], 10);
- memcpy (®isters[REGISTER_BYTE(ST2_REGNUM)], regs.pr_fpu.fpu_stack[2], 10);
- memcpy (®isters[REGISTER_BYTE(ST3_REGNUM)], regs.pr_fpu.fpu_stack[3], 10);
- memcpy (®isters[REGISTER_BYTE(ST4_REGNUM)], regs.pr_fpu.fpu_stack[4], 10);
- memcpy (®isters[REGISTER_BYTE(ST5_REGNUM)], regs.pr_fpu.fpu_stack[5], 10);
- memcpy (®isters[REGISTER_BYTE(ST6_REGNUM)], regs.pr_fpu.fpu_stack[6], 10);
- memcpy (®isters[REGISTER_BYTE(ST7_REGNUM)], regs.pr_fpu.fpu_stack[7], 10);
- }
-
- /* FIXME: This should be merged with i387-tdep.c as well. */
- static
- print_fpu_status(ep)
- struct pt_regset ep;
- {
- int i;
- int bothstatus;
- int top;
- int fpreg;
- unsigned char *p;
-
- printf_unfiltered("80387:");
- if (ep.pr_fpu.fpu_ip == 0) {
- printf_unfiltered(" not in use.\n");
- return;
- } else {
- printf_unfiltered("\n");
- }
- if (ep.pr_fpu.fpu_status != 0) {
- print_387_status_word (ep.pr_fpu.fpu_status);
- }
- print_387_control_word (ep.pr_fpu.fpu_control);
- printf_unfiltered ("last exception: ");
- printf_unfiltered ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4);
- printf_unfiltered ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip);
- printf_unfiltered ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel);
-
- top = (ep.pr_fpu.fpu_status >> 11) & 7;
-
- printf_unfiltered ("regno tag msb lsb value\n");
- for (fpreg = 7; fpreg >= 0; fpreg--)
- {
- double val;
-
- printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
-
- switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3)
- {
- case 0: printf_unfiltered ("valid "); break;
- case 1: printf_unfiltered ("zero "); break;
- case 2: printf_unfiltered ("trap "); break;
- case 3: printf_unfiltered ("empty "); break;
- }
- for (i = 9; i >= 0; i--)
- printf_unfiltered ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]);
-
- i387_to_double ((char *)ep.pr_fpu.fpu_stack[fpreg], (char *)&val);
- printf_unfiltered (" %g\n", val);
- }
- if (ep.pr_fpu.fpu_rsvd1)
- warning ("rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1);
- if (ep.pr_fpu.fpu_rsvd2)
- warning ("rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2);
- if (ep.pr_fpu.fpu_rsvd3)
- warning ("rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3);
- if (ep.pr_fpu.fpu_rsvd5)
- warning ("rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5);
- }
-
-
- print_1167_control_word(pcr)
- unsigned int pcr;
-
- {
- int pcr_tmp;
-
- pcr_tmp = pcr & FPA_PCR_MODE;
- printf_unfiltered("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12);
- switch (pcr_tmp & 12) {
- case 0:
- printf_unfiltered("RN (Nearest Value)");
- break;
- case 1:
- printf_unfiltered("RZ (Zero)");
- break;
- case 2:
- printf_unfiltered("RP (Positive Infinity)");
- break;
- case 3:
- printf_unfiltered("RM (Negative Infinity)");
- break;
- }
- printf_unfiltered("; IRND= %d ", pcr_tmp & 2);
- if (0 == pcr_tmp & 2) {
- printf_unfiltered("(same as RND)\n");
- } else {
- printf_unfiltered("(toward zero)\n");
- }
- pcr_tmp = pcr & FPA_PCR_EM;
- printf_unfiltered("\tEM= %#x", pcr_tmp);
- if (pcr_tmp & FPA_PCR_EM_DM) printf_unfiltered(" DM");
- if (pcr_tmp & FPA_PCR_EM_UOM) printf_unfiltered(" UOM");
- if (pcr_tmp & FPA_PCR_EM_PM) printf_unfiltered(" PM");
- if (pcr_tmp & FPA_PCR_EM_UM) printf_unfiltered(" UM");
- if (pcr_tmp & FPA_PCR_EM_OM) printf_unfiltered(" OM");
- if (pcr_tmp & FPA_PCR_EM_ZM) printf_unfiltered(" ZM");
- if (pcr_tmp & FPA_PCR_EM_IM) printf_unfiltered(" IM");
- printf_unfiltered("\n");
- pcr_tmp = FPA_PCR_CC;
- printf_unfiltered("\tCC= %#x", pcr_tmp);
- if (pcr_tmp & FPA_PCR_20MHZ) printf_unfiltered(" 20MHZ");
- if (pcr_tmp & FPA_PCR_CC_Z) printf_unfiltered(" Z");
- if (pcr_tmp & FPA_PCR_CC_C2) printf_unfiltered(" C2");
-
- /* Dynix defines FPA_PCR_CC_C0 to 0x100 and ptx defines
- FPA_PCR_CC_C1 to 0x100. Use whichever is defined and assume
- the OS knows what it is doing. */
- #ifdef FPA_PCR_CC_C1
- if (pcr_tmp & FPA_PCR_CC_C1) printf_unfiltered(" C1");
- #else
- if (pcr_tmp & FPA_PCR_CC_C0) printf_unfiltered(" C0");
- #endif
-
- switch (pcr_tmp)
- {
- case FPA_PCR_CC_Z:
- printf_unfiltered(" (Equal)");
- break;
- #ifdef FPA_PCR_CC_C1
- case FPA_PCR_CC_C1:
- #else
- case FPA_PCR_CC_C0:
- #endif
- printf_unfiltered(" (Less than)");
- break;
- case 0:
- printf_unfiltered(" (Greater than)");
- break;
- case FPA_PCR_CC_Z |
- #ifdef FPA_PCR_CC_C1
- FPA_PCR_CC_C1
- #else
- FPA_PCR_CC_C0
- #endif
- | FPA_PCR_CC_C2:
- printf_unfiltered(" (Unordered)");
- break;
- default:
- printf_unfiltered(" (Undefined)");
- break;
- }
- printf_unfiltered("\n");
- pcr_tmp = pcr & FPA_PCR_AE;
- printf_unfiltered("\tAE= %#x", pcr_tmp);
- if (pcr_tmp & FPA_PCR_AE_DE) printf_unfiltered(" DE");
- if (pcr_tmp & FPA_PCR_AE_UOE) printf_unfiltered(" UOE");
- if (pcr_tmp & FPA_PCR_AE_PE) printf_unfiltered(" PE");
- if (pcr_tmp & FPA_PCR_AE_UE) printf_unfiltered(" UE");
- if (pcr_tmp & FPA_PCR_AE_OE) printf_unfiltered(" OE");
- if (pcr_tmp & FPA_PCR_AE_ZE) printf_unfiltered(" ZE");
- if (pcr_tmp & FPA_PCR_AE_EE) printf_unfiltered(" EE");
- if (pcr_tmp & FPA_PCR_AE_IE) printf_unfiltered(" IE");
- printf_unfiltered("\n");
- }
-
- print_1167_regs(regs)
- long regs[FPA_NREGS];
-
- {
- int i;
-
- union {
- double d;
- long l[2];
- } xd;
- union {
- float f;
- long l;
- } xf;
-
-
- for (i = 0; i < FPA_NREGS; i++) {
- xf.l = regs[i];
- printf_unfiltered("%%fp%d: raw= %#x, single= %f", i+1, regs[i], xf.f);
- if (!(i & 1)) {
- printf_unfiltered("\n");
- } else {
- xd.l[1] = regs[i];
- xd.l[0] = regs[i+1];
- printf_unfiltered(", double= %f\n", xd.d);
- }
- }
- }
-
- print_fpa_status(ep)
- struct pt_regset ep;
-
- {
-
- printf_unfiltered("WTL 1167:");
- if (ep.pr_fpa.fpa_pcr !=0) {
- printf_unfiltered("\n");
- print_1167_control_word(ep.pr_fpa.fpa_pcr);
- print_1167_regs(ep.pr_fpa.fpa_regs);
- } else {
- printf_unfiltered(" not in use.\n");
- }
- }
-
- #if 0 /* disabled because it doesn't go through the target vector. */
- i386_float_info ()
- {
- char ubuf[UPAGES*NBPG];
- struct pt_regset regset;
-
- if (have_inferior_p())
- {
- PTRACE_READ_REGS (inferior_pid, (PTRACE_ARG3_TYPE) ®set);
- }
- else
- {
- int corechan = bfd_cache_lookup (core_bfd);
- if (lseek (corechan, 0, 0) < 0)
- {
- perror ("seek on core file");
- }
- if (myread (corechan, ubuf, UPAGES*NBPG) < 0)
- {
- perror ("read on core file");
- }
- /* only interested in the floating point registers */
- regset.pr_fpu = ((struct user *) ubuf)->u_fpusave;
- regset.pr_fpa = ((struct user *) ubuf)->u_fpasave;
- }
- print_fpu_status(regset);
- print_fpa_status(regset);
- }
- #endif
-
- static volatile int got_sigchld;
-
- /*ARGSUSED*/
- /* This will eventually be more interesting. */
- void
- sigchld_handler(signo)
- int signo;
- {
- got_sigchld++;
- }
-
- /*
- * Signals for which the default action does not cause the process
- * to die. See <sys/signal.h> for where this came from (alas, we
- * can't use those macros directly)
- */
- #ifndef sigmask
- #define sigmask(s) (1 << ((s) - 1))
- #endif
- #define SIGNALS_DFL_SAFE sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
- sigmask(SIGTTIN) | sigmask(SIGTTOU) | sigmask(SIGCHLD) | \
- sigmask(SIGCONT) | sigmask(SIGWINCH) | sigmask(SIGPWR) | \
- sigmask(SIGURG) | sigmask(SIGPOLL)
-
- #ifdef ATTACH_DETACH
- /*
- * Thanks to XPT_MPDEBUGGER, we have to mange child_wait().
- */
- int
- child_wait(pid, status)
- int pid;
- struct target_waitstatus *status;
- {
- int save_errno, rv, xvaloff, saoff, sa_hand;
- struct pt_stop pt;
- struct user u;
- sigset_t set;
- /* Host signal number for a signal which the inferior terminates with, or
- 0 if it hasn't terminated due to a signal. */
- static int death_by_signal = 0;
- #ifdef SVR4_SHARED_LIBS /* use this to distinguish ptx 2 vs ptx 4 */
- prstatus_t pstatus;
- #endif
-
- do {
- set_sigint_trap(); /* Causes SIGINT to be passed on to the
- attached process. */
- save_errno = errno;
-
- got_sigchld = 0;
-
- sigemptyset(&set);
-
- while (got_sigchld == 0) {
- sigsuspend(&set);
- }
-
- clear_sigint_trap();
-
- rv = mptrace(XPT_STOPSTAT, 0, (char *)&pt, 0);
- if (-1 == rv) {
- printf("XPT_STOPSTAT: errno %d\n", errno); /* DEBUG */
- continue;
- }
-
- pid = pt.ps_pid;
-
- if (pid != inferior_pid) {
- /* NOTE: the mystery fork in csh/tcsh needs to be ignored.
- * We should not return new children for the initial run
- * of a process until it has done the exec.
- */
- /* inferior probably forked; send it on its way */
- rv = mptrace(XPT_UNDEBUG, pid, 0, 0);
- if (-1 == rv) {
- printf("child_wait: XPT_UNDEBUG: pid %d: %s\n", pid,
- safe_strerror(errno));
- }
- continue;
- }
- /* FIXME: Do we deal with fork notification correctly? */
- switch (pt.ps_reason) {
- case PTS_FORK:
- /* multi proc: treat like PTS_EXEC */
- /*
- * Pretend this didn't happen, since gdb isn't set up
- * to deal with stops on fork.
- */
- rv = ptrace(PT_CONTSIG, pid, 1, 0);
- if (-1 == rv) {
- printf("PTS_FORK: PT_CONTSIG: error %d\n", errno);
- }
- continue;
- case PTS_EXEC:
- /*
- * Pretend this is a SIGTRAP.
- */
- status->kind = TARGET_WAITKIND_STOPPED;
- status->value.sig = TARGET_SIGNAL_TRAP;
- break;
- case PTS_EXIT:
- /*
- * Note: we stop before the exit actually occurs. Extract
- * the exit code from the uarea. If we're stopped in the
- * exit() system call, the exit code will be in
- * u.u_ap[0]. An exit due to an uncaught signal will have
- * something else in here, see the comment in the default:
- * case, below. Finally,let the process exit.
- */
- if (death_by_signal)
- {
- status->kind = TARGET_WAITKIND_SIGNALED;
- status->value.sig = target_signal_from_host (death_by_signal);
- death_by_signal = 0;
- break;
- }
- xvaloff = (unsigned long)&u.u_ap[0] - (unsigned long)&u;
- errno = 0;
- rv = ptrace(PT_RUSER, pid, (char *)xvaloff, 0);
- status->kind = TARGET_WAITKIND_EXITED;
- status->value.integer = rv;
- /*
- * addr & data to mptrace() don't matter here, since
- * the process is already dead.
- */
- rv = mptrace(XPT_UNDEBUG, pid, 0, 0);
- if (-1 == rv) {
- printf("child_wait: PTS_EXIT: XPT_UNDEBUG: pid %d error %d\n", pid,
- errno);
- }
- break;
- case PTS_WATCHPT_HIT:
- fatal("PTS_WATCHPT_HIT\n");
- break;
- default:
- /* stopped by signal */
- status->kind = TARGET_WAITKIND_STOPPED;
- status->value.sig = target_signal_from_host (pt.ps_reason);
- death_by_signal = 0;
-
- if (0 == (SIGNALS_DFL_SAFE & sigmask(pt.ps_reason))) {
- break;
- }
- /* else default action of signal is to die */
- #ifdef SVR4_SHARED_LIBS
- rv = ptrace(PT_GET_PRSTATUS, pid, (char *)&pstatus, 0);
- if (-1 == rv)
- error("child_wait: signal %d PT_GET_PRSTATUS: %s\n",
- pt.ps_reason, safe_strerror(errno));
- if (pstatus.pr_cursig != pt.ps_reason) {
- printf("pstatus signal %d, pt signal %d\n",
- pstatus.pr_cursig, pt.ps_reason);
- }
- sa_hand = (int)pstatus.pr_action.sa_handler;
- #else
- saoff = (unsigned long)&u.u_sa[0] - (unsigned long)&u;
- saoff += sizeof(struct sigaction) * (pt.ps_reason - 1);
- errno = 0;
- sa_hand = ptrace(PT_RUSER, pid, (char *)saoff, 0);
- if (errno)
- error("child_wait: signal %d: RUSER: %s\n",
- pt.ps_reason, safe_strerror(errno));
- #endif
- if ((int)SIG_DFL == sa_hand) {
- /* we will be dying */
- death_by_signal = pt.ps_reason;
- }
- break;
- }
-
- } while (pid != inferior_pid); /* Some other child died or stopped */
-
- return pid;
- }
- #else /* !ATTACH_DETACH */
- /*
- * Simple child_wait() based on inftarg.c child_wait() for use until
- * the MPDEBUGGER child_wait() works properly. This will go away when
- * that is fixed.
- */
- child_wait (pid, ourstatus)
- int pid;
- struct target_waitstatus *ourstatus;
- {
- int save_errno;
- int status;
-
- do {
- pid = wait (&status);
- save_errno = errno;
-
- if (pid == -1)
- {
- if (save_errno == EINTR)
- continue;
- fprintf (stderr, "Child process unexpectedly missing: %s.\n",
- safe_strerror (save_errno));
- ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
- return -1;
- }
- } while (pid != inferior_pid); /* Some other child died or stopped */
- store_waitstatus (ourstatus, status);
- return pid;
- }
- #endif /* ATTACH_DETACH */
-
-
-
- /* This function simply calls ptrace with the given arguments.
- It exists so that all calls to ptrace are isolated in this
- machine-dependent file. */
- int
- call_ptrace (request, pid, addr, data)
- int request, pid;
- PTRACE_ARG3_TYPE addr;
- int data;
- {
- return ptrace (request, pid, addr, data);
- }
-
- int
- call_mptrace(request, pid, addr, data)
- int request, pid;
- PTRACE_ARG3_TYPE addr;
- int data;
- {
- return mptrace(request, pid, addr, data);
- }
-
- #if defined (DEBUG_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
- #define mptrace call_mptrace
- #endif
-
- void
- kill_inferior ()
- {
- if (inferior_pid == 0)
- return;
-
- /* For MPDEBUGGER, don't use PT_KILL, since the child will stop
- again with a PTS_EXIT. Just hit him with SIGKILL (so he stops)
- and detach. */
-
- kill (inferior_pid, SIGKILL);
- #ifdef ATTACH_DETACH
- detach(SIGKILL);
- #else /* ATTACH_DETACH */
- ptrace(PT_KILL, inferior_pid, 0, 0);
- wait((int *)NULL);
- #endif /* ATTACH_DETACH */
- target_mourn_inferior ();
- }
-
- /* Resume execution of the inferior process.
- If STEP is nonzero, single-step it.
- If SIGNAL is nonzero, give it that signal. */
-
- void
- child_resume (pid, step, signal)
- int pid;
- int step;
- enum target_signal signal;
- {
- errno = 0;
-
- if (pid == -1)
- pid = inferior_pid;
-
- /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
- it was. (If GDB wanted it to start some other way, we have already
- written a new PC value to the child.)
-
- If this system does not support PT_SSTEP, a higher level function will
- have called single_step() to transmute the step request into a
- continue request (by setting breakpoints on all possible successor
- instructions), so we don't have to worry about that here. */
-
- if (step)
- ptrace (PT_SSTEP, pid, (PTRACE_ARG3_TYPE) 1, signal);
- else
- ptrace (PT_CONTSIG, pid, (PTRACE_ARG3_TYPE) 1, signal);
-
- if (errno)
- perror_with_name ("ptrace");
- }
-
- #ifdef ATTACH_DETACH
- /* Start debugging the process whose number is PID. */
- int
- attach (pid)
- int pid;
- {
- sigset_t set;
- int rv;
-
- rv = mptrace(XPT_DEBUG, pid, 0, 0);
- if (-1 == rv) {
- error("mptrace(XPT_DEBUG): %s", safe_strerror(errno));
- }
- rv = mptrace(XPT_SIGNAL, pid, 0, SIGSTOP);
- if (-1 == rv) {
- error("mptrace(XPT_SIGNAL): %s", safe_strerror(errno));
- }
- attach_flag = 1;
- return pid;
- }
-
- void
- detach (signo)
- int signo;
- {
- int rv;
-
- rv = mptrace(XPT_UNDEBUG, inferior_pid, 1, signo);
- if (-1 == rv) {
- error("mptrace(XPT_UNDEBUG): %s", safe_strerror(errno));
- }
- attach_flag = 0;
- }
-
- #endif /* ATTACH_DETACH */
-
- /* Default the type of the ptrace transfer to int. */
- #ifndef PTRACE_XFER_TYPE
- #define PTRACE_XFER_TYPE int
- #endif
-
-
- /* 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 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. */
-
- int
- child_xfer_memory (memaddr, myaddr, len, write, target)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- int write;
- struct target_ops *target; /* ignored */
- {
- register int i;
- /* Round starting address down to longword boundary. */
- 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);
- /* Allocate buffer of that many longwords. */
- register PTRACE_XFER_TYPE *buffer
- = (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_RTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- 0);
- }
-
- if (count > 1) /* FIXME, avoid if even boundary */
- {
- buffer[count - 1]
- = ptrace (PT_RTEXT, inferior_pid,
- ((PTRACE_ARG3_TYPE)
- (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
- 0);
- }
-
- /* Copy data to be written over corresponding part of buffer */
-
- memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- myaddr,
- len);
-
- /* Write the entire buffer. */
-
- for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PT_WDATA, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- buffer[i]);
- if (errno)
- {
- /* Using the appropriate one (I or D) is necessary for
- Gould NP1, at least. */
- errno = 0;
- ptrace (PT_WTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- buffer[i]);
- }
- if (errno)
- return 0;
- }
- }
- else
- {
- /* Read all the longwords */
- for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- buffer[i] = ptrace (PT_RTEXT, inferior_pid,
- (PTRACE_ARG3_TYPE) addr, 0);
- if (errno)
- return 0;
- QUIT;
- }
-
- /* Copy appropriate bytes out of the buffer. */
- memcpy (myaddr,
- (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- len);
- }
- return len;
- }
-
-
- void
- _initialize_symm_nat ()
- {
- #ifdef ATTACH_DETACH
- /*
- * the MPDEBUGGER is necessary for process tree debugging and attach
- * to work, but it alters the behavior of debugged processes, so other
- * things (at least child_wait()) will have to change to accomodate
- * that.
- *
- * Note that attach is not implemented in dynix 3, and not in ptx
- * until version 2.1 of the OS.
- */
- int rv;
- sigset_t set;
- struct sigaction sact;
-
- rv = mptrace(XPT_MPDEBUGGER, 0, 0, 0);
- if (-1 == rv) {
- fatal("_initialize_symm_nat(): mptrace(XPT_MPDEBUGGER): %s",
- safe_strerror(errno));
- }
-
- /*
- * Under MPDEBUGGER, we get SIGCLHD when a traced process does
- * anything of interest.
- */
-
- /*
- * Block SIGCHLD. We leave it blocked all the time, and then
- * call sigsuspend() in child_wait() to wait for the child
- * to do something. None of these ought to fail, but check anyway.
- */
- sigemptyset(&set);
- rv = sigaddset(&set, SIGCHLD);
- if (-1 == rv) {
- fatal("_initialize_symm_nat(): sigaddset(SIGCHLD): %s",
- safe_strerror(errno));
- }
- rv = sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
- if (-1 == rv) {
- fatal("_initialize_symm_nat(): sigprocmask(SIG_BLOCK): %s",
- safe_strerror(errno));
- }
-
- sact.sa_handler = sigchld_handler;
- sigemptyset(&sact.sa_mask);
- sact.sa_flags = SA_NOCLDWAIT; /* keep the zombies away */
- rv = sigaction(SIGCHLD, &sact, (struct sigaction *)NULL);
- if (-1 == rv) {
- fatal("_initialize_symm_nat(): sigaction(SIGCHLD): %s",
- safe_strerror(errno));
- }
- #endif
- }
-