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847 lines
24 KiB
C
847 lines
24 KiB
C
/* Sequent Symmetry host interface, for GDB when running under Unix.
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Copyright 1986, 1987, 1989, 1991, 1992, 1994 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* FIXME, some 387-specific items of use taken from i387-tdep.c -- ought to be
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merged back in. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "symtab.h"
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#include "target.h"
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/* FIXME: What is the _INKERNEL define for? */
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#define _INKERNEL
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#include <signal.h>
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#undef _INKERNEL
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#include <sys/wait.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/proc.h>
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#include <sys/dir.h>
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#include <sys/ioctl.h>
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#include "gdb_stat.h"
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#ifdef _SEQUENT_
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#include <sys/ptrace.h>
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#else
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/* Dynix has only machine/ptrace.h, which is already included by sys/user.h */
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/* Dynix has no mptrace call */
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#define mptrace ptrace
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#endif
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#include "gdbcore.h"
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#include <fcntl.h>
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#include <sgtty.h>
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#define TERMINAL struct sgttyb
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#include "gdbcore.h"
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void
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store_inferior_registers(regno)
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int regno;
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{
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struct pt_regset regs;
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int i;
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extern char registers[];
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/* FIXME: Fetching the registers is a kludge to initialize all elements
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in the fpu and fpa status. This works for normal debugging, but
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might cause problems when calling functions in the inferior.
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At least fpu_control and fpa_pcr (probably more) should be added
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to the registers array to solve this properly. */
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mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
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regs.pr_eax = *(int *)®isters[REGISTER_BYTE(0)];
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regs.pr_ebx = *(int *)®isters[REGISTER_BYTE(5)];
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regs.pr_ecx = *(int *)®isters[REGISTER_BYTE(2)];
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regs.pr_edx = *(int *)®isters[REGISTER_BYTE(1)];
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regs.pr_esi = *(int *)®isters[REGISTER_BYTE(6)];
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regs.pr_edi = *(int *)®isters[REGISTER_BYTE(7)];
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regs.pr_esp = *(int *)®isters[REGISTER_BYTE(14)];
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regs.pr_ebp = *(int *)®isters[REGISTER_BYTE(15)];
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regs.pr_eip = *(int *)®isters[REGISTER_BYTE(16)];
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regs.pr_flags = *(int *)®isters[REGISTER_BYTE(17)];
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for (i = 0; i < 31; i++)
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{
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regs.pr_fpa.fpa_regs[i] =
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*(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)];
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}
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memcpy (regs.pr_fpu.fpu_stack[0], ®isters[REGISTER_BYTE(ST0_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[1], ®isters[REGISTER_BYTE(ST1_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[2], ®isters[REGISTER_BYTE(ST2_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[3], ®isters[REGISTER_BYTE(ST3_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[4], ®isters[REGISTER_BYTE(ST4_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[5], ®isters[REGISTER_BYTE(ST5_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[6], ®isters[REGISTER_BYTE(ST6_REGNUM)], 10);
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memcpy (regs.pr_fpu.fpu_stack[7], ®isters[REGISTER_BYTE(ST7_REGNUM)], 10);
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mptrace (XPT_WREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
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}
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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int i;
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struct pt_regset regs;
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extern char registers[];
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registers_fetched ();
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mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) ®s, 0);
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*(int *)®isters[REGISTER_BYTE(EAX_REGNUM)] = regs.pr_eax;
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*(int *)®isters[REGISTER_BYTE(EBX_REGNUM)] = regs.pr_ebx;
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*(int *)®isters[REGISTER_BYTE(ECX_REGNUM)] = regs.pr_ecx;
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*(int *)®isters[REGISTER_BYTE(EDX_REGNUM)] = regs.pr_edx;
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*(int *)®isters[REGISTER_BYTE(ESI_REGNUM)] = regs.pr_esi;
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*(int *)®isters[REGISTER_BYTE(EDI_REGNUM)] = regs.pr_edi;
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*(int *)®isters[REGISTER_BYTE(EBP_REGNUM)] = regs.pr_ebp;
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*(int *)®isters[REGISTER_BYTE(ESP_REGNUM)] = regs.pr_esp;
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*(int *)®isters[REGISTER_BYTE(EIP_REGNUM)] = regs.pr_eip;
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*(int *)®isters[REGISTER_BYTE(EFLAGS_REGNUM)] = regs.pr_flags;
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for (i = 0; i < FPA_NREGS; i++)
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{
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*(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)] =
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regs.pr_fpa.fpa_regs[i];
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}
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memcpy (®isters[REGISTER_BYTE(ST0_REGNUM)], regs.pr_fpu.fpu_stack[0], 10);
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memcpy (®isters[REGISTER_BYTE(ST1_REGNUM)], regs.pr_fpu.fpu_stack[1], 10);
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memcpy (®isters[REGISTER_BYTE(ST2_REGNUM)], regs.pr_fpu.fpu_stack[2], 10);
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memcpy (®isters[REGISTER_BYTE(ST3_REGNUM)], regs.pr_fpu.fpu_stack[3], 10);
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memcpy (®isters[REGISTER_BYTE(ST4_REGNUM)], regs.pr_fpu.fpu_stack[4], 10);
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memcpy (®isters[REGISTER_BYTE(ST5_REGNUM)], regs.pr_fpu.fpu_stack[5], 10);
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memcpy (®isters[REGISTER_BYTE(ST6_REGNUM)], regs.pr_fpu.fpu_stack[6], 10);
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memcpy (®isters[REGISTER_BYTE(ST7_REGNUM)], regs.pr_fpu.fpu_stack[7], 10);
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}
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/* FIXME: This should be merged with i387-tdep.c as well. */
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static
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print_fpu_status(ep)
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struct pt_regset ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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unsigned char *p;
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printf_unfiltered("80387:");
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if (ep.pr_fpu.fpu_ip == 0) {
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printf_unfiltered(" not in use.\n");
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return;
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} else {
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printf_unfiltered("\n");
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}
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if (ep.pr_fpu.fpu_status != 0) {
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print_387_status_word (ep.pr_fpu.fpu_status);
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}
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print_387_control_word (ep.pr_fpu.fpu_control);
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printf_unfiltered ("last exception: ");
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printf_unfiltered ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4);
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printf_unfiltered ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip);
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printf_unfiltered ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel);
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top = (ep.pr_fpu.fpu_status >> 11) & 7;
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printf_unfiltered ("regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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double val;
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printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
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switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3)
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{
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case 0: printf_unfiltered ("valid "); break;
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case 1: printf_unfiltered ("zero "); break;
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case 2: printf_unfiltered ("trap "); break;
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case 3: printf_unfiltered ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf_unfiltered ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]);
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i387_to_double ((char *)ep.pr_fpu.fpu_stack[fpreg], (char *)&val);
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printf_unfiltered (" %g\n", val);
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}
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if (ep.pr_fpu.fpu_rsvd1)
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warning ("rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1);
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if (ep.pr_fpu.fpu_rsvd2)
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warning ("rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2);
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if (ep.pr_fpu.fpu_rsvd3)
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warning ("rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3);
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if (ep.pr_fpu.fpu_rsvd5)
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warning ("rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5);
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}
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print_1167_control_word(pcr)
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unsigned int pcr;
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{
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int pcr_tmp;
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pcr_tmp = pcr & FPA_PCR_MODE;
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printf_unfiltered("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12);
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switch (pcr_tmp & 12) {
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case 0:
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printf_unfiltered("RN (Nearest Value)");
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break;
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case 1:
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printf_unfiltered("RZ (Zero)");
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break;
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case 2:
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printf_unfiltered("RP (Positive Infinity)");
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break;
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case 3:
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printf_unfiltered("RM (Negative Infinity)");
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break;
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}
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printf_unfiltered("; IRND= %d ", pcr_tmp & 2);
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if (0 == pcr_tmp & 2) {
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printf_unfiltered("(same as RND)\n");
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} else {
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printf_unfiltered("(toward zero)\n");
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}
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pcr_tmp = pcr & FPA_PCR_EM;
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printf_unfiltered("\tEM= %#x", pcr_tmp);
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if (pcr_tmp & FPA_PCR_EM_DM) printf_unfiltered(" DM");
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if (pcr_tmp & FPA_PCR_EM_UOM) printf_unfiltered(" UOM");
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if (pcr_tmp & FPA_PCR_EM_PM) printf_unfiltered(" PM");
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if (pcr_tmp & FPA_PCR_EM_UM) printf_unfiltered(" UM");
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if (pcr_tmp & FPA_PCR_EM_OM) printf_unfiltered(" OM");
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if (pcr_tmp & FPA_PCR_EM_ZM) printf_unfiltered(" ZM");
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if (pcr_tmp & FPA_PCR_EM_IM) printf_unfiltered(" IM");
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printf_unfiltered("\n");
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pcr_tmp = FPA_PCR_CC;
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printf_unfiltered("\tCC= %#x", pcr_tmp);
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if (pcr_tmp & FPA_PCR_20MHZ) printf_unfiltered(" 20MHZ");
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if (pcr_tmp & FPA_PCR_CC_Z) printf_unfiltered(" Z");
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if (pcr_tmp & FPA_PCR_CC_C2) printf_unfiltered(" C2");
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/* Dynix defines FPA_PCR_CC_C0 to 0x100 and ptx defines
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FPA_PCR_CC_C1 to 0x100. Use whichever is defined and assume
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the OS knows what it is doing. */
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#ifdef FPA_PCR_CC_C1
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if (pcr_tmp & FPA_PCR_CC_C1) printf_unfiltered(" C1");
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#else
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if (pcr_tmp & FPA_PCR_CC_C0) printf_unfiltered(" C0");
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#endif
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switch (pcr_tmp)
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{
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case FPA_PCR_CC_Z:
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printf_unfiltered(" (Equal)");
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break;
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#ifdef FPA_PCR_CC_C1
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case FPA_PCR_CC_C1:
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#else
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case FPA_PCR_CC_C0:
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#endif
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printf_unfiltered(" (Less than)");
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break;
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case 0:
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printf_unfiltered(" (Greater than)");
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break;
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case FPA_PCR_CC_Z |
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#ifdef FPA_PCR_CC_C1
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FPA_PCR_CC_C1
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#else
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FPA_PCR_CC_C0
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#endif
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| FPA_PCR_CC_C2:
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printf_unfiltered(" (Unordered)");
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break;
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default:
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printf_unfiltered(" (Undefined)");
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break;
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}
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printf_unfiltered("\n");
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pcr_tmp = pcr & FPA_PCR_AE;
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printf_unfiltered("\tAE= %#x", pcr_tmp);
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if (pcr_tmp & FPA_PCR_AE_DE) printf_unfiltered(" DE");
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if (pcr_tmp & FPA_PCR_AE_UOE) printf_unfiltered(" UOE");
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if (pcr_tmp & FPA_PCR_AE_PE) printf_unfiltered(" PE");
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if (pcr_tmp & FPA_PCR_AE_UE) printf_unfiltered(" UE");
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if (pcr_tmp & FPA_PCR_AE_OE) printf_unfiltered(" OE");
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if (pcr_tmp & FPA_PCR_AE_ZE) printf_unfiltered(" ZE");
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if (pcr_tmp & FPA_PCR_AE_EE) printf_unfiltered(" EE");
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if (pcr_tmp & FPA_PCR_AE_IE) printf_unfiltered(" IE");
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printf_unfiltered("\n");
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}
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print_1167_regs(regs)
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long regs[FPA_NREGS];
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{
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int i;
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union {
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double d;
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long l[2];
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} xd;
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union {
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float f;
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long l;
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} xf;
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for (i = 0; i < FPA_NREGS; i++) {
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xf.l = regs[i];
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printf_unfiltered("%%fp%d: raw= %#x, single= %f", i+1, regs[i], xf.f);
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if (!(i & 1)) {
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printf_unfiltered("\n");
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} else {
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xd.l[1] = regs[i];
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xd.l[0] = regs[i+1];
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printf_unfiltered(", double= %f\n", xd.d);
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}
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}
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}
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print_fpa_status(ep)
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struct pt_regset ep;
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{
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printf_unfiltered("WTL 1167:");
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if (ep.pr_fpa.fpa_pcr !=0) {
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printf_unfiltered("\n");
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print_1167_control_word(ep.pr_fpa.fpa_pcr);
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print_1167_regs(ep.pr_fpa.fpa_regs);
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} else {
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printf_unfiltered(" not in use.\n");
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}
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}
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#if 0 /* disabled because it doesn't go through the target vector. */
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i386_float_info ()
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{
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char ubuf[UPAGES*NBPG];
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struct pt_regset regset;
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if (have_inferior_p())
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{
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PTRACE_READ_REGS (inferior_pid, (PTRACE_ARG3_TYPE) ®set);
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}
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else
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{
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int corechan = bfd_cache_lookup (core_bfd);
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if (lseek (corechan, 0, 0) < 0)
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{
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perror ("seek on core file");
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}
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if (myread (corechan, ubuf, UPAGES*NBPG) < 0)
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{
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perror ("read on core file");
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}
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/* only interested in the floating point registers */
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regset.pr_fpu = ((struct user *) ubuf)->u_fpusave;
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regset.pr_fpa = ((struct user *) ubuf)->u_fpasave;
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}
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print_fpu_status(regset);
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print_fpa_status(regset);
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}
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#endif
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static volatile int got_sigchld;
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/*ARGSUSED*/
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/* This will eventually be more interesting. */
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void
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sigchld_handler(signo)
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int signo;
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{
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got_sigchld++;
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}
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/*
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* Signals for which the default action does not cause the process
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* to die. See <sys/signal.h> for where this came from (alas, we
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* can't use those macros directly)
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*/
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#ifndef sigmask
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#define sigmask(s) (1 << ((s) - 1))
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#endif
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#define SIGNALS_DFL_SAFE sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
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sigmask(SIGTTIN) | sigmask(SIGTTOU) | sigmask(SIGCHLD) | \
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sigmask(SIGCONT) | sigmask(SIGWINCH) | sigmask(SIGPWR) | \
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sigmask(SIGURG) | sigmask(SIGPOLL)
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#ifdef ATTACH_DETACH
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/*
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* Thanks to XPT_MPDEBUGGER, we have to mange child_wait().
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*/
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int
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child_wait(pid, status)
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int pid;
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struct target_waitstatus *status;
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{
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int save_errno, rv, xvaloff, saoff, sa_hand;
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struct pt_stop pt;
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struct user u;
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sigset_t set;
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/* Host signal number for a signal which the inferior terminates with, or
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0 if it hasn't terminated due to a signal. */
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static int death_by_signal = 0;
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#ifdef SVR4_SHARED_LIBS /* use this to distinguish ptx 2 vs ptx 4 */
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prstatus_t pstatus;
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#endif
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do {
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set_sigint_trap(); /* Causes SIGINT to be passed on to the
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attached process. */
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save_errno = errno;
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got_sigchld = 0;
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sigemptyset(&set);
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while (got_sigchld == 0) {
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sigsuspend(&set);
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}
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clear_sigint_trap();
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rv = mptrace(XPT_STOPSTAT, 0, (char *)&pt, 0);
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if (-1 == rv) {
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printf("XPT_STOPSTAT: errno %d\n", errno); /* DEBUG */
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continue;
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}
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pid = pt.ps_pid;
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if (pid != inferior_pid) {
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/* NOTE: the mystery fork in csh/tcsh needs to be ignored.
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* We should not return new children for the initial run
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* of a process until it has done the exec.
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*/
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/* inferior probably forked; send it on its way */
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rv = mptrace(XPT_UNDEBUG, pid, 0, 0);
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if (-1 == rv) {
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printf("child_wait: XPT_UNDEBUG: pid %d: %s\n", pid,
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safe_strerror(errno));
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}
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continue;
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}
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/* FIXME: Do we deal with fork notification correctly? */
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switch (pt.ps_reason) {
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case PTS_FORK:
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/* multi proc: treat like PTS_EXEC */
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/*
|
||
* 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
|
||
}
|