old-cross-binutils/gdb/s390-nat.c
Thiago Jung Bauermann 0cf6dd1543 2010-07-07 Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com>
Thiago Jung Bauermann  <bauerman@br.ibm.com>

	Support for hw accelerated condition watchpoints in booke powerpc.

	* breakpoint.c (fetch_watchpoint_value): Rename to fetch_subexp_value
	and move to eval.c.  Change callers.
	(insert_bp_location): Pass watchpoint condition in
	target_insert_watchpoint.
	(remove_breakpoint_1) Pass watchpoint condition in
	target_remove_watchpoint.
	(watchpoint_locations_match): Call
	target_can_accel_watchpoint_condition.
	* eval.c: Include wrapper.h.
	(fetch_subexp_value): Moved from breakpoint.c.
	* ppc-linux-nat.c (ppc_linux_region_ok_for_hw_watchpoint):
	Formatting fix.
	(can_use_watchpoint_cond_accel): New function.
	(calculate_dvc): Likewise.
	(num_memory_accesses): Likewise.
	(check_condition): Likewise.
	(ppc_linux_can_accel_watchpoint_condition): Likewise
	(ppc_linux_insert_watchpoint): Call can_use_watchpoint_cond_accel,
	check_condition and calculate_dvc.
	(ppc_linux_remove_watchpoint): Likewise.
	(_initialize_ppc_linux_nat): Set to_can_accel_watchpoint_condition to
	ppc_linux_can_accel_watchpoint_condition
	* target.c (debug_to_insert_watchpoint): Add argument for watchpoint
	condition.
	(debug_to_remove_watchpoint): Likewise.
	(debug_to_can_accel_watchpoint_condition): New function.
	(update_current_target): Set to_can_accel_watchpoint_condition.
	(setup_target_debug): Set to_can_accel_watchpoint_condition.
	* target.h: Add opaque declaration for struct expression.
	(struct target_ops) <to_insert_watchpoint>,
	<to_remove_watchpoint>: Add new arguments to pass the watchpoint
	<to_can_accel_watchpoint_condition>: New member.
	condition.  Update all callers and implementations.
	(target_can_accel_watchpoint_condition): New macro.
	* value.c (free_value_chain): New function.
	* value.h (fetch_subexp_value): New prototype.
	(free_value_chain): Likewise.
2010-07-07 16:15:18 +00:00

507 lines
14 KiB
C

/* S390 native-dependent code for GDB, the GNU debugger.
Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009
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 "auxv.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>
#include <elf.h>
#ifndef HWCAP_S390_HIGH_GPRS
#define HWCAP_S390_HIGH_GPRS 512
#endif
/* 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) &regs;
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 *) &regs);
}
/* 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) &regs;
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, &regs, 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 target_ops *ops,
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 target_ops *ops,
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 expression *cond)
{
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 expression *cond)
{
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 type == bp_hardware_watchpoint;
}
static int
s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
{
return 1;
}
static int
s390_target_wordsize (void)
{
int wordsize = 4;
/* Check for 64-bit inferior process. This is the case when the host is
64-bit, and in addition bit 32 of the PSW mask is set. */
#ifdef __s390x__
long pswm;
errno = 0;
pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
if (errno == 0 && (pswm & 0x100000000ul) != 0)
wordsize = 8;
#endif
return wordsize;
}
static int
s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
{
int sizeof_auxv_field = s390_target_wordsize ();
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
gdb_byte *ptr = *readptr;
if (endptr == ptr)
return 0;
if (endptr - ptr < sizeof_auxv_field * 2)
return -1;
*typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
ptr += sizeof_auxv_field;
*valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
ptr += sizeof_auxv_field;
*readptr = ptr;
return 1;
}
#ifdef __s390x__
static unsigned long
s390_get_hwcap (void)
{
CORE_ADDR field;
if (target_auxv_search (&current_target, AT_HWCAP, &field))
return (unsigned long) field;
return 0;
}
#endif
static const struct target_desc *
s390_read_description (struct target_ops *ops)
{
#ifdef __s390x__
/* If GDB itself is compiled as 64-bit, we are running on a machine in
z/Architecture mode. If the target is running in 64-bit addressing
mode, report s390x architecture. If the target is running in 31-bit
addressing mode, but the kernel supports using 64-bit registers in
that mode, report s390 architecture with 64-bit GPRs. */
if (s390_target_wordsize () == 8)
return tdesc_s390x_linux64;
if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
return tdesc_s390_linux64;
#endif
/* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior
on a 64-bit kernel that does not support using 64-bit registers in 31-bit
mode, report s390 architecture with 32-bit GPRs. */
return tdesc_s390_linux32;
}
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;
/* Detect target architecture. */
t->to_read_description = s390_read_description;
t->to_auxv_parse = s390_auxv_parse;
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, s390_fix_watch_points);
}