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rs6000-aix-nat.c
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rs6000-aix-nat.c
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/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
Copyright (C) 1986-2024 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "symfile.h"
#include "objfiles.h"
#include "bfd.h"
#include "gdb-stabs.h"
#include "regcache.h"
#include "arch-utils.h"
#include "inf-child.h"
#include "inf-ptrace.h"
#include "ppc-tdep.h"
#include "rs6000-aix-tdep.h"
#include "exec.h"
#include "observable.h"
#include "xcoffread.h"
#include <sys/ptrace.h>
#include <sys/reg.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <a.out.h>
#include <sys/file.h>
#include <sys/stat.h>
#include "gdb_bfd.h"
#include <sys/core.h>
#define __LDINFO_PTRACE32__ /* for __ld_info32 */
#define __LDINFO_PTRACE64__ /* for __ld_info64 */
#include <sys/ldr.h>
#include <sys/systemcfg.h>
/* Header files for getting ppid in AIX of a child process. */
#include <procinfo.h>
#include <sys/types.h>
/* Header files for alti-vec reg. */
#include <sys/context.h>
/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
debugging 32-bit and 64-bit processes. Define a typedef and macros for
accessing fields in the appropriate structures. */
/* In 32-bit compilation mode (which is the only mode from which ptrace()
works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
#if defined (__ld_info32) || defined (__ld_info64)
# define ARCH3264
#endif
/* Return whether the current architecture is 64-bit. */
#ifndef ARCH3264
# define ARCH64() 0
#else
# define ARCH64() (register_size (current_inferior ()->arch (), 0) == 8)
#endif
class rs6000_nat_target final : public inf_ptrace_target
{
public:
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
void create_inferior (const char *, const std::string &,
char **, int) override;
ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
/* Fork detection related functions, For adding multi process debugging
support. */
void follow_fork (inferior *, ptid_t, target_waitkind, bool, bool) override;
const struct target_desc *read_description () override;
int insert_fork_catchpoint (int) override;
int remove_fork_catchpoint (int) override;
protected:
void post_startup_inferior (ptid_t ptid) override;
private:
enum target_xfer_status
xfer_shared_libraries (enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len);
};
static rs6000_nat_target the_rs6000_nat_target;
/* The below declaration is to track number of times, parent has
reported fork event before its children. */
static std::list<pid_t> aix_pending_parent;
/* The below declaration is for a child process event that
is reported before its corresponding parent process in
the event of a fork (). */
static std::list<pid_t> aix_pending_children;
static void
aix_remember_child (pid_t pid)
{
aix_pending_children.push_front (pid);
}
static void
aix_remember_parent (pid_t pid)
{
aix_pending_parent.push_front (pid);
}
/* This function returns a parent of a child process. */
static pid_t
find_my_aix_parent (pid_t child_pid)
{
struct procsinfo ProcessBuffer1;
if (getprocs (&ProcessBuffer1, sizeof (ProcessBuffer1),
NULL, 0, &child_pid, 1) != 1)
return 0;
else
return ProcessBuffer1.pi_ppid;
}
/* In the below function we check if there was any child
process pending. If it exists we return it from the
list, otherwise we return a null. */
static pid_t
has_my_aix_child_reported (pid_t parent_pid)
{
pid_t child = 0;
auto it = std::find_if (aix_pending_children.begin (),
aix_pending_children.end (),
[=] (pid_t child_pid)
{
return find_my_aix_parent (child_pid) == parent_pid;
});
if (it != aix_pending_children.end ())
{
child = *it;
aix_pending_children.erase (it);
}
return child;
}
/* In the below function we check if there was any parent
process pending. If it exists we return it from the
list, otherwise we return a null. */
static pid_t
has_my_aix_parent_reported (pid_t child_pid)
{
pid_t my_parent = find_my_aix_parent (child_pid);
auto it = std::find (aix_pending_parent.begin (),
aix_pending_parent.end (),
my_parent);
if (it != aix_pending_parent.end ())
{
aix_pending_parent.erase (it);
return my_parent;
}
return 0;
}
/* Given REGNO, a gdb register number, return the corresponding
number suitable for use as a ptrace() parameter. Return -1 if
there's no suitable mapping. Also, set the int pointed to by
ISFLOAT to indicate whether REGNO is a floating point register. */
static int
regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
{
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
*isfloat = 0;
if (tdep->ppc_gp0_regnum <= regno
&& regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
return regno;
else if (tdep->ppc_fp0_regnum >= 0
&& tdep->ppc_fp0_regnum <= regno
&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
{
*isfloat = 1;
return regno - tdep->ppc_fp0_regnum + FPR0;
}
else if (regno == gdbarch_pc_regnum (gdbarch))
return IAR;
else if (regno == tdep->ppc_ps_regnum)
return MSR;
else if (regno == tdep->ppc_cr_regnum)
return CR;
else if (regno == tdep->ppc_lr_regnum)
return LR;
else if (regno == tdep->ppc_ctr_regnum)
return CTR;
else if (regno == tdep->ppc_xer_regnum)
return XER;
else if (tdep->ppc_fpscr_regnum >= 0
&& regno == tdep->ppc_fpscr_regnum)
return FPSCR;
else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
return MQ;
else
return -1;
}
/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
static int
rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
{
#ifdef HAVE_PTRACE64
int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf);
#else
int ret = ptrace (req, id, (int *)addr, data, buf);
#endif
#if 0
printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
#endif
return ret;
}
/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
static int
rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
{
#ifdef ARCH3264
# ifdef HAVE_PTRACE64
int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
# else
int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
# endif
#else
int ret = 0;
#endif
#if 0
printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
req, id, hex_string (addr), data, (unsigned int)buf, ret);
#endif
return ret;
}
/* Store the vsx registers. */
static void
store_vsx_register_aix (struct regcache *regcache, int regno)
{
int ret;
struct gdbarch *gdbarch = regcache->arch ();
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
struct thrdentry64 thrdentry;
__vsx_context_t vsx;
pid_t pid = inferior_ptid.pid ();
tid64_t thrd_i = 0;
if (getthrds64(pid, &thrdentry, sizeof(struct thrdentry64),
&thrd_i, 1) == 1)
thrd_i = thrdentry.ti_tid;
memset(&vsx, 0, sizeof(__vsx_context_t));
if (__power_vsx() && thrd_i > 0)
{
if (ARCH64 ())
ret = rs6000_ptrace64 (PTT_READ_VSX, thrd_i, (long long) &vsx, 0, 0);
else
ret = rs6000_ptrace32 (PTT_READ_VSX, thrd_i, (int *)&vsx, 0, 0);
if (ret < 0)
return;
regcache->raw_collect (regno, &(vsx.__vsr_dw1[0])+
regno - tdep->ppc_vsr0_upper_regnum);
if (ARCH64 ())
ret = rs6000_ptrace64 (PTT_WRITE_VSX, thrd_i, (long long) &vsx, 0, 0);
else
ret = rs6000_ptrace32 (PTT_WRITE_VSX, thrd_i, (int *) &vsx, 0, 0);
if (ret < 0)
perror_with_name (_("Unable to write VSX registers after reading it"));
}
}
/* Store Altivec registers. */
static void
store_altivec_register_aix (struct regcache *regcache, int regno)
{
int ret;
struct gdbarch *gdbarch = regcache->arch ();
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
struct thrdentry64 thrdentry;
__vmx_context_t vmx;
pid_t pid = inferior_ptid.pid ();
tid64_t thrd_i = 0;
if (getthrds64(pid, &thrdentry, sizeof(struct thrdentry64),
&thrd_i, 1) == 1)
thrd_i = thrdentry.ti_tid;
memset(&vmx, 0, sizeof(__vmx_context_t));
if (__power_vmx() && thrd_i > 0)
{
if (ARCH64 ())
ret = rs6000_ptrace64 (PTT_READ_VEC, thrd_i, (long long) &vmx, 0, 0);
else
ret = rs6000_ptrace32 (PTT_READ_VEC, thrd_i, (int *) &vmx, 0, 0);
if (ret < 0)
return;
regcache->raw_collect (regno, &(vmx.__vr[0]) + regno
- tdep->ppc_vr0_regnum);
if (ARCH64 ())
ret = rs6000_ptrace64 (PTT_WRITE_VEC, thrd_i, (long long) &vmx, 0, 0);
else
ret = rs6000_ptrace32 (PTT_WRITE_VEC, thrd_i, (int *) &vmx, 0, 0);
if (ret < 0)
perror_with_name (_("Unable to store AltiVec register after reading it"));
}
}
/* Supply altivec registers. */
static void
supply_vrregset_aix (struct regcache *regcache, __vmx_context_t *vmx)
{
int i;
struct gdbarch *gdbarch = regcache->arch ();
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
for (i = 0; i < num_of_vrregs; i++)
regcache->raw_supply (tdep->ppc_vr0_regnum + i,
&(vmx->__vr[i]));
regcache->raw_supply (tdep->ppc_vrsave_regnum, &(vmx->__vrsave));
regcache->raw_supply (tdep->ppc_vrsave_regnum - 1, &(vmx->__vscr));
}
/* Fetch altivec register. */
static void
fetch_altivec_registers_aix (struct regcache *regcache)
{
struct thrdentry64 thrdentry;
__vmx_context_t vmx;
pid_t pid = current_inferior ()->pid;
tid64_t thrd_i = 0;
if (getthrds64(pid, &thrdentry, sizeof(struct thrdentry64),
&thrd_i, 1) == 1)
thrd_i = thrdentry.ti_tid;
memset(&vmx, 0, sizeof(__vmx_context_t));
if (__power_vmx() && thrd_i > 0)
{
if (ARCH64 ())
rs6000_ptrace64 (PTT_READ_VEC, thrd_i, (long long) &vmx, 0, 0);
else
rs6000_ptrace32 (PTT_READ_VEC, thrd_i, (int *) &vmx, 0, 0);
supply_vrregset_aix (regcache, &vmx);
}
}
/* supply vsx register. */
static void
supply_vsxregset_aix (struct regcache *regcache, __vsx_context_t *vsx)
{
int i;
struct gdbarch *gdbarch = regcache->arch ();
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
for (i = 0; i < ppc_num_vshrs; i++)
regcache->raw_supply (tdep->ppc_vsr0_upper_regnum + i,
&(vsx->__vsr_dw1[i]));
}
/* Fetch vsx registers. */
static void
fetch_vsx_registers_aix (struct regcache *regcache)
{
struct thrdentry64 thrdentry;
__vsx_context_t vsx;
pid_t pid = current_inferior ()->pid;
tid64_t thrd_i = 0;
if (getthrds64(pid, &thrdentry, sizeof(struct thrdentry64),
&thrd_i, 1) == 1)
thrd_i = thrdentry.ti_tid;
memset(&vsx, 0, sizeof(__vsx_context_t));
if (__power_vsx() && thrd_i > 0)
{
if (ARCH64 ())
rs6000_ptrace64 (PTT_READ_VSX, thrd_i, (long long) &vsx, 0, 0);
else
rs6000_ptrace32 (PTT_READ_VSX, thrd_i, (int *) &vsx, 0, 0);
supply_vsxregset_aix (regcache, &vsx);
}
}
void rs6000_nat_target::post_startup_inferior (ptid_t ptid)
{
/* In AIX to turn on multi process debugging in ptrace
PT_MULTI is the option to be passed,
with the process ID which can fork () and
the data parameter [fourth parameter] must be 1. */
if (!ARCH64 ())
rs6000_ptrace32 (PT_MULTI, ptid.pid(), 0, 1, 0);
else
rs6000_ptrace64 (PT_MULTI, ptid.pid(), 0, 1, 0);
}
void
rs6000_nat_target::follow_fork (inferior *child_inf, ptid_t child_ptid,
target_waitkind fork_kind, bool follow_child,
bool detach_fork)
{
/* Once the fork event is detected the infrun.c code
calls the target_follow_fork to take care of
follow child and detach the child activity which is
done using the function below. */
inf_ptrace_target::follow_fork (child_inf, child_ptid, fork_kind,
follow_child, detach_fork);
/* If we detach fork and follow child we do not want the child
process to generate events that ptrace can trace. Hence we
detach it. */
if (detach_fork && !follow_child)
{
if (ARCH64 ())
rs6000_ptrace64 (PT_DETACH, child_ptid.pid (), 0, 0, 0);
else
rs6000_ptrace32 (PT_DETACH, child_ptid.pid (), 0, 0, 0);
}
}
/* Functions for catchpoint in AIX. */
int
rs6000_nat_target::insert_fork_catchpoint (int pid)
{
return 0;
}
int
rs6000_nat_target::remove_fork_catchpoint (int pid)
{
return 0;
}
/* Fetch register REGNO from the inferior. */
static void
fetch_register (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
int addr[PPC_MAX_REGISTER_SIZE];
int nr, isfloat;
pid_t pid = regcache->ptid ().pid ();
/* Retrieved values may be -1, so infer errors from errno. */
errno = 0;
/* Alti-vec register. */
if (altivec_register_p (gdbarch, regno))
{
fetch_altivec_registers_aix (regcache);
return;
}
/* VSX register. */
if (vsx_register_p (gdbarch, regno))
{
fetch_vsx_registers_aix (regcache);
return;
}
nr = regmap (gdbarch, regno, &isfloat);
/* Floating-point registers. */
if (isfloat)
rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0);
/* Bogus register number. */
else if (nr < 0)
{
if (regno >= gdbarch_num_regs (gdbarch))
gdb_printf (gdb_stderr,
"gdb error: register no %d not implemented.\n",
regno);
return;
}
/* Fixed-point registers. */
else
{
if (!ARCH64 ())
*addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0);
else
{
/* PT_READ_GPR requires the buffer parameter to point to long long,
even if the register is really only 32 bits. */
long long buf;
rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf);
if (register_size (gdbarch, regno) == 8)
memcpy (addr, &buf, 8);
else
*addr = buf;
}
}
if (!errno)
regcache->raw_supply (regno, (char *) addr);
else
{
#if 0
/* FIXME: this happens 3 times at the start of each 64-bit program. */
perror (_("ptrace read"));
#endif
errno = 0;
}
}
/* Store register REGNO back into the inferior. */
static void
store_register (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
int addr[PPC_MAX_REGISTER_SIZE];
int nr, isfloat;
pid_t pid = regcache->ptid ().pid ();
/* Fetch the register's value from the register cache. */
regcache->raw_collect (regno, addr);
/* -1 can be a successful return value, so infer errors from errno. */
errno = 0;
if (altivec_register_p (gdbarch, regno))
{
store_altivec_register_aix (regcache, regno);
return;
}
if (vsx_register_p (gdbarch, regno))
{
store_vsx_register_aix (regcache, regno);
return;
}
nr = regmap (gdbarch, regno, &isfloat);
/* Floating-point registers. */
if (isfloat)
rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0);
/* Bogus register number. */
else if (nr < 0)
{
if (regno >= gdbarch_num_regs (gdbarch))
gdb_printf (gdb_stderr,
"gdb error: register no %d not implemented.\n",
regno);
}
/* Fixed-point registers. */
else
{
/* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
the register's value is passed by value, but for 64-bit inferiors,
the address of a buffer containing the value is passed. */
if (!ARCH64 ())
rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0);
else
{
/* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
area, even if the register is really only 32 bits. */
long long buf;
if (register_size (gdbarch, regno) == 8)
memcpy (&buf, addr, 8);
else
buf = *addr;
rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf);
}
}
if (errno)
{
perror (_("ptrace write"));
errno = 0;
}
}
/* Read from the inferior all registers if REGNO == -1 and just register
REGNO otherwise. */
void
rs6000_nat_target::fetch_registers (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
if (regno != -1)
fetch_register (regcache, regno);
else
{
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
/* Read 32 general purpose registers. */
for (regno = tdep->ppc_gp0_regnum;
regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
regno++)
{
fetch_register (regcache, regno);
}
/* Read general purpose floating point registers. */
if (tdep->ppc_fp0_regnum >= 0)
for (regno = 0; regno < ppc_num_fprs; regno++)
fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
fetch_altivec_registers_aix (regcache);
if (tdep->ppc_vsr0_upper_regnum != -1)
fetch_vsx_registers_aix (regcache);
/* Read special registers. */
fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
fetch_register (regcache, tdep->ppc_ps_regnum);
fetch_register (regcache, tdep->ppc_cr_regnum);
fetch_register (regcache, tdep->ppc_lr_regnum);
fetch_register (regcache, tdep->ppc_ctr_regnum);
fetch_register (regcache, tdep->ppc_xer_regnum);
if (tdep->ppc_fpscr_regnum >= 0)
fetch_register (regcache, tdep->ppc_fpscr_regnum);
if (tdep->ppc_mq_regnum >= 0)
fetch_register (regcache, tdep->ppc_mq_regnum);
}
}
const struct target_desc *
rs6000_nat_target::read_description ()
{
if (ARCH64())
{
if (__power_vsx ())
return tdesc_powerpc_vsx64;
else if (__power_vmx ())
return tdesc_powerpc_altivec64;
}
else
{
if (__power_vsx ())
return tdesc_powerpc_vsx32;
else if (__power_vmx ())
return tdesc_powerpc_altivec32;
}
return NULL;
}
/* 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
rs6000_nat_target::store_registers (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = regcache->arch ();
if (regno != -1)
store_register (regcache, regno);
else
{
ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch);
/* Write general purpose registers first. */
for (regno = tdep->ppc_gp0_regnum;
regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
regno++)
{
store_register (regcache, regno);
}
/* Write floating point registers. */
if (tdep->ppc_fp0_regnum >= 0)
for (regno = 0; regno < ppc_num_fprs; regno++)
store_register (regcache, tdep->ppc_fp0_regnum + regno);
/* Write special registers. */
store_register (regcache, gdbarch_pc_regnum (gdbarch));
store_register (regcache, tdep->ppc_ps_regnum);
store_register (regcache, tdep->ppc_cr_regnum);
store_register (regcache, tdep->ppc_lr_regnum);
store_register (regcache, tdep->ppc_ctr_regnum);
store_register (regcache, tdep->ppc_xer_regnum);
if (tdep->ppc_fpscr_regnum >= 0)
store_register (regcache, tdep->ppc_fpscr_regnum);
if (tdep->ppc_mq_regnum >= 0)
store_register (regcache, tdep->ppc_mq_regnum);
}
}
/* Implement the to_xfer_partial target_ops method. */
enum target_xfer_status
rs6000_nat_target::xfer_partial (enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len)
{
pid_t pid = inferior_ptid.pid ();
int arch64 = ARCH64 ();
switch (object)
{
case TARGET_OBJECT_LIBRARIES_AIX:
return xfer_shared_libraries (object, annex,
readbuf, writebuf,
offset, len, xfered_len);
case TARGET_OBJECT_MEMORY:
{
union
{
PTRACE_TYPE_RET word;
gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
} buffer;
ULONGEST rounded_offset;
LONGEST partial_len;
/* Round the start offset down to the next long word
boundary. */
rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
/* Since ptrace will transfer a single word starting at that
rounded_offset the partial_len needs to be adjusted down to
that (remember this function only does a single transfer).
Should the required length be even less, adjust it down
again. */
partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
if (partial_len > len)
partial_len = len;
if (writebuf)
{
/* If OFFSET:PARTIAL_LEN is smaller than
ROUNDED_OFFSET:WORDSIZE then a read/modify write will
be needed. Read in the entire word. */
if (rounded_offset < offset
|| (offset + partial_len
< rounded_offset + sizeof (PTRACE_TYPE_RET)))
{
/* Need part of initial word -- fetch it. */
if (arch64)
buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
rounded_offset, 0, NULL);
else
buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
(int *) (uintptr_t)
rounded_offset,
0, NULL);
}
/* Copy data to be written over corresponding part of
buffer. */
memcpy (buffer.byte + (offset - rounded_offset),
writebuf, partial_len);
errno = 0;
if (arch64)
rs6000_ptrace64 (PT_WRITE_D, pid,
rounded_offset, buffer.word, NULL);
else
rs6000_ptrace32 (PT_WRITE_D, pid,
(int *) (uintptr_t) rounded_offset,
buffer.word, NULL);
if (errno)
return TARGET_XFER_EOF;
}
if (readbuf)
{
errno = 0;
if (arch64)
buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
rounded_offset, 0, NULL);
else
buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
(int *)(uintptr_t)rounded_offset,
0, NULL);
if (errno)
return TARGET_XFER_EOF;
/* Copy appropriate bytes out of the buffer. */
memcpy (readbuf, buffer.byte + (offset - rounded_offset),
partial_len);
}
*xfered_len = (ULONGEST) partial_len;
return TARGET_XFER_OK;
}
default:
return TARGET_XFER_E_IO;
}
}
/* Wait for the child specified by PTID to do something. Return the
process ID of the child, or MINUS_ONE_PTID in case of error; store
the status in *OURSTATUS. */
ptid_t
rs6000_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
target_wait_flags options)
{
pid_t pid;
int status, save_errno;
while (1)
{
set_sigint_trap ();
do
{
pid = waitpid (ptid.pid (), &status, 0);
save_errno = errno;
}
while (pid == -1 && errno == EINTR);
clear_sigint_trap ();
if (pid == -1)
{
gdb_printf (gdb_stderr,
_("Child process unexpectedly missing: %s.\n"),
safe_strerror (save_errno));
ourstatus->set_ignore ();
return minus_one_ptid;
}
/* Ignore terminated detached child processes. */
if (!WIFSTOPPED (status) && find_inferior_pid (this, pid) == nullptr)
continue;
/* Check for a fork () event. */
if ((status & 0xff) == W_SFWTED)
{
/* Checking whether it is a parent or a child event. */
/* If the event is a child we check if there was a parent
event recorded before. If yes we got the parent child
relationship. If not we push this child and wait for
the next fork () event. */
if (find_inferior_pid (this, pid) == nullptr)
{
pid_t parent_pid = has_my_aix_parent_reported (pid);
if (parent_pid > 0)
{
ourstatus->set_forked (ptid_t (pid));
return ptid_t (parent_pid);
}
aix_remember_child (pid);
}
/* If the event is a parent we check if there was a child
event recorded before. If yes we got the parent child
relationship. If not we push this parent and wait for
the next fork () event. */
else
{
pid_t child_pid = has_my_aix_child_reported (pid);
if (child_pid > 0)
{
ourstatus->set_forked (ptid_t (child_pid));
return ptid_t (pid);
}
aix_remember_parent (pid);
}
continue;
}
break;
}
/* AIX has a couple of strange returns from wait(). */
/* stop after load" status. */
if (status == 0x57c)
ourstatus->set_loaded ();
/* 0x7f is signal 0. */
else if (status == 0x7f)
ourstatus->set_spurious ();
/* A normal waitstatus. Let the usual macros deal with it. */
else
*ourstatus = host_status_to_waitstatus (status);
return ptid_t (pid);
}
/* Set the current architecture from the host running GDB. Called when
starting a child process. */
void
rs6000_nat_target::create_inferior (const char *exec_file,
const std::string &allargs,
char **env, int from_tty)
{
enum bfd_architecture arch;
unsigned long mach;
bfd abfd;
inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty);
if (__power_rs ())
{
arch = bfd_arch_rs6000;
mach = bfd_mach_rs6k;
}
else
{
arch = bfd_arch_powerpc;
mach = bfd_mach_ppc;
}
/* FIXME: schauer/2002-02-25:
We don't know if we are executing a 32 or 64 bit executable,
and have no way to pass the proper word size to rs6000_gdbarch_init.
So we have to avoid switching to a new architecture, if the architecture
matches already.
Blindly calling rs6000_gdbarch_init used to work in older versions of
GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
determine the wordsize. */
if (current_program_space->exec_bfd ())
{
const struct bfd_arch_info *exec_bfd_arch_info;
exec_bfd_arch_info
= bfd_get_arch_info (current_program_space->exec_bfd ());
if (arch == exec_bfd_arch_info->arch)
return;
}
bfd_default_set_arch_mach (&abfd, arch, mach);
gdbarch_info info;
info.bfd_arch_info = bfd_get_arch_info (&abfd);
info.abfd = current_program_space->exec_bfd ();
if (!gdbarch_update_p (info))
internal_error (_("rs6000_create_inferior: failed "
"to select architecture"));
}