417 lines
11 KiB
C
417 lines
11 KiB
C
/* S390 native-dependent code for GDB, the GNU debugger.
|
|
Copyright (C) 2001, 2003, 2004, 2005, 2006
|
|
Free Software Foundation, Inc
|
|
|
|
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
|
|
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
|
|
|
|
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 "regcache.h"
|
|
#include "inferior.h"
|
|
#include "target.h"
|
|
#include "linux-nat.h"
|
|
|
|
#include "s390-tdep.h"
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <sys/ptrace.h>
|
|
#include <asm/types.h>
|
|
#include <sys/procfs.h>
|
|
#include <sys/ucontext.h>
|
|
|
|
|
|
/* Map registers to gregset/ptrace offsets.
|
|
These arrays are defined in s390-tdep.c. */
|
|
|
|
#ifdef __s390x__
|
|
#define regmap_gregset s390x_regmap_gregset
|
|
#else
|
|
#define regmap_gregset s390_regmap_gregset
|
|
#endif
|
|
|
|
#define regmap_fpregset s390_regmap_fpregset
|
|
|
|
/* When debugging a 32-bit executable running under a 64-bit kernel,
|
|
we have to fix up the 64-bit registers we get from the kernel
|
|
to make them look like 32-bit registers. */
|
|
#ifdef __s390x__
|
|
#define SUBOFF(gdbarch, i) \
|
|
((gdbarch_ptr_bit (gdbarch) == 32 \
|
|
&& ((i) == S390_PSWA_REGNUM \
|
|
|| ((i) >= S390_R0_REGNUM && (i) <= S390_R15_REGNUM)))? 4 : 0)
|
|
#else
|
|
#define SUBOFF(gdbarch, i) 0
|
|
#endif
|
|
|
|
|
|
/* Fill GDB's register array with the general-purpose register values
|
|
in *REGP. */
|
|
void
|
|
supply_gregset (struct regcache *regcache, const gregset_t *regp)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
int i;
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (regmap_gregset[i] != -1)
|
|
regcache_raw_supply (regcache, i,
|
|
(const char *)regp + regmap_gregset[i]
|
|
+ SUBOFF (gdbarch, i));
|
|
}
|
|
|
|
/* Fill register REGNO (if it is a general-purpose register) in
|
|
*REGP with the value in GDB's register array. If REGNO is -1,
|
|
do this for all registers. */
|
|
void
|
|
fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
int i;
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (regmap_gregset[i] != -1)
|
|
if (regno == -1 || regno == i)
|
|
regcache_raw_collect (regcache, i,
|
|
(char *)regp + regmap_gregset[i]
|
|
+ SUBOFF (gdbarch, i));
|
|
}
|
|
|
|
/* Fill GDB's register array with the floating-point register values
|
|
in *REGP. */
|
|
void
|
|
supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
|
|
{
|
|
int i;
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (regmap_fpregset[i] != -1)
|
|
regcache_raw_supply (regcache, i,
|
|
(const char *)regp + regmap_fpregset[i]);
|
|
}
|
|
|
|
/* Fill register REGNO (if it is a general-purpose register) in
|
|
*REGP with the value in GDB's register array. If REGNO is -1,
|
|
do this for all registers. */
|
|
void
|
|
fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
|
|
{
|
|
int i;
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (regmap_fpregset[i] != -1)
|
|
if (regno == -1 || regno == i)
|
|
regcache_raw_collect (regcache, i,
|
|
(char *)regp + regmap_fpregset[i]);
|
|
}
|
|
|
|
/* Find the TID for the current inferior thread to use with ptrace. */
|
|
static int
|
|
s390_inferior_tid (void)
|
|
{
|
|
/* GNU/Linux LWP ID's are process ID's. */
|
|
int tid = TIDGET (inferior_ptid);
|
|
if (tid == 0)
|
|
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
|
|
|
return tid;
|
|
}
|
|
|
|
/* Fetch all general-purpose registers from process/thread TID and
|
|
store their values in GDB's register cache. */
|
|
static void
|
|
fetch_regs (struct regcache *regcache, int tid)
|
|
{
|
|
gregset_t regs;
|
|
ptrace_area parea;
|
|
|
|
parea.len = sizeof (regs);
|
|
parea.process_addr = (addr_t) ®s;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, psw);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't get registers"));
|
|
|
|
supply_gregset (regcache, (const gregset_t *) ®s);
|
|
}
|
|
|
|
/* Store all valid general-purpose registers in GDB's register cache
|
|
into the process/thread specified by TID. */
|
|
static void
|
|
store_regs (const struct regcache *regcache, int tid, int regnum)
|
|
{
|
|
gregset_t regs;
|
|
ptrace_area parea;
|
|
|
|
parea.len = sizeof (regs);
|
|
parea.process_addr = (addr_t) ®s;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, psw);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't get registers"));
|
|
|
|
fill_gregset (regcache, ®s, regnum);
|
|
|
|
if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't write registers"));
|
|
}
|
|
|
|
/* Fetch all floating-point registers from process/thread TID and store
|
|
their values in GDB's register cache. */
|
|
static void
|
|
fetch_fpregs (struct regcache *regcache, int tid)
|
|
{
|
|
fpregset_t fpregs;
|
|
ptrace_area parea;
|
|
|
|
parea.len = sizeof (fpregs);
|
|
parea.process_addr = (addr_t) &fpregs;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't get floating point status"));
|
|
|
|
supply_fpregset (regcache, (const fpregset_t *) &fpregs);
|
|
}
|
|
|
|
/* Store all valid floating-point registers in GDB's register cache
|
|
into the process/thread specified by TID. */
|
|
static void
|
|
store_fpregs (const struct regcache *regcache, int tid, int regnum)
|
|
{
|
|
fpregset_t fpregs;
|
|
ptrace_area parea;
|
|
|
|
parea.len = sizeof (fpregs);
|
|
parea.process_addr = (addr_t) &fpregs;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't get floating point status"));
|
|
|
|
fill_fpregset (regcache, &fpregs, regnum);
|
|
|
|
if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
|
|
perror_with_name (_("Couldn't write floating point status"));
|
|
}
|
|
|
|
/* Fetch register REGNUM from the child process. If REGNUM is -1, do
|
|
this for all registers. */
|
|
static void
|
|
s390_linux_fetch_inferior_registers (struct regcache *regcache, int regnum)
|
|
{
|
|
int tid = s390_inferior_tid ();
|
|
|
|
if (regnum == -1
|
|
|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
|
|
fetch_regs (regcache, tid);
|
|
|
|
if (regnum == -1
|
|
|| (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
|
|
fetch_fpregs (regcache, tid);
|
|
}
|
|
|
|
/* Store register REGNUM back into the child process. If REGNUM is
|
|
-1, do this for all registers. */
|
|
static void
|
|
s390_linux_store_inferior_registers (struct regcache *regcache, int regnum)
|
|
{
|
|
int tid = s390_inferior_tid ();
|
|
|
|
if (regnum == -1
|
|
|| (regnum < S390_NUM_REGS && regmap_gregset[regnum] != -1))
|
|
store_regs (regcache, tid, regnum);
|
|
|
|
if (regnum == -1
|
|
|| (regnum < S390_NUM_REGS && regmap_fpregset[regnum] != -1))
|
|
store_fpregs (regcache, tid, regnum);
|
|
}
|
|
|
|
|
|
/* Hardware-assisted watchpoint handling. */
|
|
|
|
/* We maintain a list of all currently active watchpoints in order
|
|
to properly handle watchpoint removal.
|
|
|
|
The only thing we actually need is the total address space area
|
|
spanned by the watchpoints. */
|
|
|
|
struct watch_area
|
|
{
|
|
struct watch_area *next;
|
|
CORE_ADDR lo_addr;
|
|
CORE_ADDR hi_addr;
|
|
};
|
|
|
|
static struct watch_area *watch_base = NULL;
|
|
|
|
static int
|
|
s390_stopped_by_watchpoint (void)
|
|
{
|
|
per_lowcore_bits per_lowcore;
|
|
ptrace_area parea;
|
|
int result;
|
|
|
|
/* Speed up common case. */
|
|
if (!watch_base)
|
|
return 0;
|
|
|
|
parea.len = sizeof (per_lowcore);
|
|
parea.process_addr = (addr_t) & per_lowcore;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0)
|
|
perror_with_name (_("Couldn't retrieve watchpoint status"));
|
|
|
|
result = (per_lowcore.perc_storage_alteration == 1
|
|
&& per_lowcore.perc_store_real_address == 0);
|
|
|
|
if (result)
|
|
{
|
|
/* Do not report this watchpoint again. */
|
|
memset (&per_lowcore, 0, sizeof (per_lowcore));
|
|
if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0)
|
|
perror_with_name (_("Couldn't clear watchpoint status"));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
s390_fix_watch_points (ptid_t ptid)
|
|
{
|
|
int tid;
|
|
|
|
per_struct per_info;
|
|
ptrace_area parea;
|
|
|
|
CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
|
|
struct watch_area *area;
|
|
|
|
tid = TIDGET (ptid);
|
|
if (tid == 0)
|
|
tid = PIDGET (ptid);
|
|
|
|
for (area = watch_base; area; area = area->next)
|
|
{
|
|
watch_lo_addr = min (watch_lo_addr, area->lo_addr);
|
|
watch_hi_addr = max (watch_hi_addr, area->hi_addr);
|
|
}
|
|
|
|
parea.len = sizeof (per_info);
|
|
parea.process_addr = (addr_t) & per_info;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0)
|
|
perror_with_name (_("Couldn't retrieve watchpoint status"));
|
|
|
|
if (watch_base)
|
|
{
|
|
per_info.control_regs.bits.em_storage_alteration = 1;
|
|
per_info.control_regs.bits.storage_alt_space_ctl = 1;
|
|
}
|
|
else
|
|
{
|
|
per_info.control_regs.bits.em_storage_alteration = 0;
|
|
per_info.control_regs.bits.storage_alt_space_ctl = 0;
|
|
}
|
|
per_info.starting_addr = watch_lo_addr;
|
|
per_info.ending_addr = watch_hi_addr;
|
|
|
|
if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0)
|
|
perror_with_name (_("Couldn't modify watchpoint status"));
|
|
}
|
|
|
|
static int
|
|
s390_insert_watchpoint (CORE_ADDR addr, int len, int type)
|
|
{
|
|
struct lwp_info *lp;
|
|
ptid_t ptid;
|
|
struct watch_area *area = xmalloc (sizeof (struct watch_area));
|
|
|
|
if (!area)
|
|
return -1;
|
|
|
|
area->lo_addr = addr;
|
|
area->hi_addr = addr + len - 1;
|
|
|
|
area->next = watch_base;
|
|
watch_base = area;
|
|
|
|
ALL_LWPS (lp, ptid)
|
|
s390_fix_watch_points (ptid);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
s390_remove_watchpoint (CORE_ADDR addr, int len, int type)
|
|
{
|
|
struct lwp_info *lp;
|
|
ptid_t ptid;
|
|
struct watch_area *area, **parea;
|
|
|
|
for (parea = &watch_base; *parea; parea = &(*parea)->next)
|
|
if ((*parea)->lo_addr == addr
|
|
&& (*parea)->hi_addr == addr + len - 1)
|
|
break;
|
|
|
|
if (!*parea)
|
|
{
|
|
fprintf_unfiltered (gdb_stderr,
|
|
"Attempt to remove nonexistent watchpoint.\n");
|
|
return -1;
|
|
}
|
|
|
|
area = *parea;
|
|
*parea = area->next;
|
|
xfree (area);
|
|
|
|
ALL_LWPS (lp, ptid)
|
|
s390_fix_watch_points (ptid);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
s390_can_use_hw_breakpoint (int type, int cnt, int othertype)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
void _initialize_s390_nat (void);
|
|
|
|
void
|
|
_initialize_s390_nat (void)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
/* Fill in the generic GNU/Linux methods. */
|
|
t = linux_target ();
|
|
|
|
/* Add our register access methods. */
|
|
t->to_fetch_registers = s390_linux_fetch_inferior_registers;
|
|
t->to_store_registers = s390_linux_store_inferior_registers;
|
|
|
|
/* Add our watchpoint methods. */
|
|
t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint;
|
|
t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint;
|
|
t->to_have_continuable_watchpoint = 1;
|
|
t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint;
|
|
t->to_insert_watchpoint = s390_insert_watchpoint;
|
|
t->to_remove_watchpoint = s390_remove_watchpoint;
|
|
|
|
/* Register the target. */
|
|
linux_nat_add_target (t);
|
|
linux_nat_set_new_thread (t, s390_fix_watch_points);
|
|
}
|