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316 lines
7.4 KiB
C
316 lines
7.4 KiB
C
/* Native-dependent code for LynxOS.
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Copyright 1993, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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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 "target.h"
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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static unsigned long registers_addr PARAMS ((int pid));
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#define X(ENTRY)(offsetof(struct econtext, ENTRY))
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#ifdef I386
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/* Mappings from tm-i386v.h */
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static int regmap[] =
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{
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X(eax),
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X(ecx),
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X(edx),
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X(ebx),
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X(esp), /* sp */
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X(ebp), /* fp */
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X(esi),
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X(edi),
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X(eip), /* pc */
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X(flags), /* ps */
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X(cs),
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X(ss),
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X(ds),
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X(es),
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X(ecode), /* Lynx doesn't give us either fs or gs, so */
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X(fault), /* we just substitute these two in the hopes
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that they are useful. */
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};
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#endif
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#ifdef M68K
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/* Mappings from tm-m68k.h */
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static int regmap[] =
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{
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X(regs[0]), /* d0 */
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X(regs[1]), /* d1 */
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X(regs[2]), /* d2 */
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X(regs[3]), /* d3 */
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X(regs[4]), /* d4 */
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X(regs[5]), /* d5 */
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X(regs[6]), /* d6 */
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X(regs[7]), /* d7 */
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X(regs[8]), /* a0 */
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X(regs[9]), /* a1 */
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X(regs[10]), /* a2 */
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X(regs[11]), /* a3 */
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X(regs[12]), /* a4 */
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X(regs[13]), /* a5 */
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X(regs[14]), /* fp */
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offsetof (st_t, usp) - offsetof (st_t, ec), /* sp */
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X(status), /* ps */
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X(pc),
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X(fregs[0*3]), /* fp0 */
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X(fregs[1*3]), /* fp1 */
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X(fregs[2*3]), /* fp2 */
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X(fregs[3*3]), /* fp3 */
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X(fregs[4*3]), /* fp4 */
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X(fregs[5*3]), /* fp5 */
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X(fregs[6*3]), /* fp6 */
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X(fregs[7*3]), /* fp7 */
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X(fcregs[0]), /* fpcontrol */
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X(fcregs[1]), /* fpstatus */
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X(fcregs[2]), /* fpiaddr */
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X(ssw), /* fpcode */
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X(fault), /* fpflags */
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};
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#endif
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/* Return the offset relative to the start of the per-thread data to the
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saved context block. */
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static unsigned long
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registers_addr(pid)
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int pid;
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{
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CORE_ADDR stblock;
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int ecpoff = offsetof(st_t, ecp);
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CORE_ADDR ecp;
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errno = 0;
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stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE)0,
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0);
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if (errno)
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perror_with_name ("registers_addr(PTRACE_THREADUSER)");
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ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE)ecpoff,
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0);
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if (errno)
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perror_with_name ("registers_addr(PTRACE_PEEKTHREAD)");
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return ecp - stblock;
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}
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/* Fetch one or more registers from the inferior. REGNO == -1 to get
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them all. We actually fetch more than requested, when convenient,
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marking them as valid so we won't fetch them again. */
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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 reglo, reghi;
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int i;
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unsigned long ecp;
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if (regno == -1)
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{
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reglo = 0;
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reghi = NUM_REGS - 1;
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}
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else
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reglo = reghi = regno;
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ecp = registers_addr (inferior_pid);
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for (regno = reglo; regno <= reghi; regno++)
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{
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char buf[MAX_REGISTER_RAW_SIZE];
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int ptrace_fun = PTRACE_PEEKTHREAD;
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#ifdef PTRACE_PEEKUSP
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ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD;
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#endif
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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unsigned int reg;
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errno = 0;
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reg = ptrace (ptrace_fun, inferior_pid,
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(PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), 0);
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if (errno)
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perror_with_name ("fetch_inferior_registers(ptrace)");
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*(int *)&buf[i] = reg;
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}
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supply_register (regno, buf);
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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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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int reglo, reghi;
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int i;
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unsigned long ecp;
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if (regno == -1)
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{
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reglo = 0;
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reghi = NUM_REGS - 1;
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}
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else
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reglo = reghi = regno;
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ecp = registers_addr (inferior_pid);
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for (regno = reglo; regno <= reghi; regno++)
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{
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int ptrace_fun = PTRACE_POKEUSER;
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#ifdef PTRACE_POKEUSP
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ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER;
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#endif
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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unsigned int reg;
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reg = *(unsigned int *)®isters[REGISTER_BYTE (regno) + i];
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errno = 0;
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ptrace (ptrace_fun, inferior_pid,
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(PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), reg);
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if (errno)
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perror_with_name ("PTRACE_POKEUSER");
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}
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}
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}
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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int
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child_wait (pid, ourstatus)
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int pid;
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struct target_waitstatus *ourstatus;
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{
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int save_errno;
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int thread;
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int status;
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while (1)
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{
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int sig;
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if (attach_flag)
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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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pid = wait (status);
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save_errno = errno;
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if (attach_flag)
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clear_sigint_trap();
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if (pid == -1)
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{
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if (save_errno == EINTR)
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continue;
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fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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return -1;
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}
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if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
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continue;
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/* thread = WIFTID (status);*/
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thread = status >> 16;
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/* Initial thread value can only be acquired via wait, so we have to
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resort to this hack. */
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if (TIDGET (inferior_pid) == 0)
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{
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inferior_pid = BUILDPID (inferior_pid, thread);
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add_thread (inferior_pid);
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}
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pid = BUILDPID (pid, thread);
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store_waitstatus (ourstatus, status);
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return pid;
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}
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}
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/* Convert a Lynx process ID to a string. Returns the string in a static
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buffer. */
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char *
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lynx_pid_to_str (pid)
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int pid;
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{
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static char buf[40];
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sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
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return buf;
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}
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/* Extract the register values out of the core file and store
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them where `read_register' will find them.
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CORE_REG_SECT points to the register values themselves, read into memory.
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CORE_REG_SIZE is the size of that area.
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WHICH says which set of registers we are handling (0 = int, 2 = float
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on machines where they are discontiguous).
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REG_ADDR is the offset from u.u_ar0 to the register values relative to
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core_reg_sect. This is used with old-fashioned core files to
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locate the registers in a large upage-plus-stack ".reg" section.
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Original upage address X is at location core_reg_sect+x+reg_addr.
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*/
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void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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unsigned reg_addr;
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{
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struct st_entry s;
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unsigned int regno;
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for (regno = 0; regno < NUM_REGS; regno++)
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supply_register (regno, core_reg_sect + offsetof (st_t, ec)
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+ regmap[regno]);
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}
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