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