binutils-gdb/gdb/lynx-nat.c

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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 *)&registers[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, status)
int pid;
struct target_waitstatus *ourstatus;
{
int save_errno;
int thread;
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]);
}