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binutils-gdb/gdb/ppc-linux-nat.c

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/* PPC GNU/Linux native support.
Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003,
2004, 2005, 2006, 2007 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "gdb_string.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "target.h"
#include "linux-nat.h"
#include <stdint.h>
#include <sys/types.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include "gdb_wait.h"
#include <fcntl.h>
#include <sys/procfs.h>
#include <sys/ptrace.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
#include "ppc-tdep.h"
/* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a
configure time check. Some older glibc's (for instance 2.2.1)
don't have a specific powerpc version of ptrace.h, and fall back on
a generic one. In such cases, sys/ptrace.h defines
PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that
ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and
PTRACE_SETVRREGS to be. This also makes a configury check pretty
much useless. */
/* These definitions should really come from the glibc header files,
but Glibc doesn't know about the vrregs yet. */
#ifndef PTRACE_GETVRREGS
#define PTRACE_GETVRREGS 18
#define PTRACE_SETVRREGS 19
#endif
/* Similarly for the ptrace requests for getting / setting the SPE
registers (ev0 -- ev31, acc, and spefscr). See the description of
gdb_evrregset_t for details. */
#ifndef PTRACE_GETEVRREGS
#define PTRACE_GETEVRREGS 20
#define PTRACE_SETEVRREGS 21
#endif
/* Similarly for the hardware watchpoint support. */
#ifndef PTRACE_GET_DEBUGREG
#define PTRACE_GET_DEBUGREG 25
#endif
#ifndef PTRACE_SET_DEBUGREG
#define PTRACE_SET_DEBUGREG 26
#endif
#ifndef PTRACE_GETSIGINFO
#define PTRACE_GETSIGINFO 0x4202
#endif
/* This oddity is because the Linux kernel defines elf_vrregset_t as
an array of 33 16 bytes long elements. I.e. it leaves out vrsave.
However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return
the vrsave as an extra 4 bytes at the end. I opted for creating a
flat array of chars, so that it is easier to manipulate for gdb.
There are 32 vector registers 16 bytes longs, plus a VSCR register
which is only 4 bytes long, but is fetched as a 16 bytes
quantity. Up to here we have the elf_vrregset_t structure.
Appended to this there is space for the VRSAVE register: 4 bytes.
Even though this vrsave register is not included in the regset
typedef, it is handled by the ptrace requests.
Note that GNU/Linux doesn't support little endian PPC hardware,
therefore the offset at which the real value of the VSCR register
is located will be always 12 bytes.
The layout is like this (where x is the actual value of the vscr reg): */
/* *INDENT-OFF* */
/*
|.|.|.|.|.....|.|.|.|.||.|.|.|x||.|
<-------> <-------><-------><->
VR0 VR31 VSCR VRSAVE
*/
/* *INDENT-ON* */
#define SIZEOF_VRREGS 33*16+4
typedef char gdb_vrregset_t[SIZEOF_VRREGS];
/* On PPC processors that support the the Signal Processing Extension
(SPE) APU, the general-purpose registers are 64 bits long.
However, the ordinary Linux kernel PTRACE_PEEKUSER / PTRACE_POKEUSER
ptrace calls only access the lower half of each register, to allow
them to behave the same way they do on non-SPE systems. There's a
separate pair of calls, PTRACE_GETEVRREGS / PTRACE_SETEVRREGS, that
read and write the top halves of all the general-purpose registers
at once, along with some SPE-specific registers.
GDB itself continues to claim the general-purpose registers are 32
bits long. It has unnamed raw registers that hold the upper halves
of the gprs, and the the full 64-bit SIMD views of the registers,
'ev0' -- 'ev31', are pseudo-registers that splice the top and
bottom halves together.
This is the structure filled in by PTRACE_GETEVRREGS and written to
the inferior's registers by PTRACE_SETEVRREGS. */
struct gdb_evrregset_t
{
unsigned long evr[32];
unsigned long long acc;
unsigned long spefscr;
};
/* Non-zero if our kernel may support the PTRACE_GETVRREGS and
PTRACE_SETVRREGS requests, for reading and writing the Altivec
registers. Zero if we've tried one of them and gotten an
error. */
int have_ptrace_getvrregs = 1;
static CORE_ADDR last_stopped_data_address = 0;
/* Non-zero if our kernel may support the PTRACE_GETEVRREGS and
PTRACE_SETEVRREGS requests, for reading and writing the SPE
registers. Zero if we've tried one of them and gotten an
error. */
int have_ptrace_getsetevrregs = 1;
/* *INDENT-OFF* */
/* registers layout, as presented by the ptrace interface:
PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
/* *INDENT_ON * */
static int
ppc_register_u_addr (int regno)
{
int u_addr = -1;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
interface, and not the wordsize of the program's ABI. */
int wordsize = sizeof (long);
/* General purpose registers occupy 1 slot each in the buffer */
if (regno >= tdep->ppc_gp0_regnum
&& regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
u_addr = ((regno - tdep->ppc_gp0_regnum + PT_R0) * wordsize);
/* Floating point regs: eight bytes each in both 32- and 64-bit
ptrace interfaces. Thus, two slots each in 32-bit interface, one
slot each in 64-bit interface. */
if (tdep->ppc_fp0_regnum >= 0
&& regno >= tdep->ppc_fp0_regnum
&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
u_addr = (PT_FPR0 * wordsize) + ((regno - tdep->ppc_fp0_regnum) * 8);
/* UISA special purpose registers: 1 slot each */
if (regno == PC_REGNUM)
u_addr = PT_NIP * wordsize;
if (regno == tdep->ppc_lr_regnum)
u_addr = PT_LNK * wordsize;
if (regno == tdep->ppc_cr_regnum)
u_addr = PT_CCR * wordsize;
if (regno == tdep->ppc_xer_regnum)
u_addr = PT_XER * wordsize;
if (regno == tdep->ppc_ctr_regnum)
u_addr = PT_CTR * wordsize;
#ifdef PT_MQ
if (regno == tdep->ppc_mq_regnum)
u_addr = PT_MQ * wordsize;
#endif
if (regno == tdep->ppc_ps_regnum)
u_addr = PT_MSR * wordsize;
if (tdep->ppc_fpscr_regnum >= 0
&& regno == tdep->ppc_fpscr_regnum)
{
/* NOTE: cagney/2005-02-08: On some 64-bit GNU/Linux systems the
kernel headers incorrectly contained the 32-bit definition of
PT_FPSCR. For the 32-bit definition, floating-point
registers occupy two 32-bit "slots", and the FPSCR lives in
the secondhalf of such a slot-pair (hence +1). For 64-bit,
the FPSCR instead occupies the full 64-bit 2-word-slot and
hence no adjustment is necessary. Hack around this. */
if (wordsize == 8 && PT_FPSCR == (48 + 32 + 1))
u_addr = (48 + 32) * wordsize;
else
u_addr = PT_FPSCR * wordsize;
}
return u_addr;
}
/* The Linux kernel ptrace interface for AltiVec registers uses the
registers set mechanism, as opposed to the interface for all the
other registers, that stores/fetches each register individually. */
static void
fetch_altivec_register (struct regcache *regcache, int tid, int regno)
{
int ret;
int offset = 0;
gdb_vrregset_t regs;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum);
ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name (_("Unable to fetch AltiVec register"));
}
/* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
long on the hardware. We deal only with the lower 4 bytes of the
vector. VRSAVE is at the end of the array in a 4 bytes slot, so
there is no need to define an offset for it. */
if (regno == (tdep->ppc_vrsave_regnum - 1))
offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum);
regcache_raw_supply (regcache, regno,
regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
}
/* Fetch the top 32 bits of TID's general-purpose registers and the
SPE-specific registers, and place the results in EVRREGSET. If we
don't support PTRACE_GETEVRREGS, then just fill EVRREGSET with
zeros.
All the logic to deal with whether or not the PTRACE_GETEVRREGS and
PTRACE_SETEVRREGS requests are supported is isolated here, and in
set_spe_registers. */
static void
get_spe_registers (int tid, struct gdb_evrregset_t *evrregset)
{
if (have_ptrace_getsetevrregs)
{
if (ptrace (PTRACE_GETEVRREGS, tid, 0, evrregset) >= 0)
return;
else
{
/* EIO means that the PTRACE_GETEVRREGS request isn't supported;
we just return zeros. */
if (errno == EIO)
have_ptrace_getsetevrregs = 0;
else
/* Anything else needs to be reported. */
perror_with_name (_("Unable to fetch SPE registers"));
}
}
memset (evrregset, 0, sizeof (*evrregset));
}
/* Supply values from TID for SPE-specific raw registers: the upper
halves of the GPRs, the accumulator, and the spefscr. REGNO must
be the number of an upper half register, acc, spefscr, or -1 to
supply the values of all registers. */
static void
fetch_spe_register (struct regcache *regcache, int tid, int regno)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
struct gdb_evrregset_t evrregs;
gdb_assert (sizeof (evrregs.evr[0])
== register_size (current_gdbarch, tdep->ppc_ev0_upper_regnum));
gdb_assert (sizeof (evrregs.acc)
== register_size (current_gdbarch, tdep->ppc_acc_regnum));
gdb_assert (sizeof (evrregs.spefscr)
== register_size (current_gdbarch, tdep->ppc_spefscr_regnum));
get_spe_registers (tid, &evrregs);
if (regno == -1)
{
int i;
for (i = 0; i < ppc_num_gprs; i++)
regcache_raw_supply (regcache, tdep->ppc_ev0_upper_regnum + i,
&evrregs.evr[i]);
}
else if (tdep->ppc_ev0_upper_regnum <= regno
&& regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs)
regcache_raw_supply (regcache, regno,
&evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]);
if (regno == -1
|| regno == tdep->ppc_acc_regnum)
regcache_raw_supply (regcache, tdep->ppc_acc_regnum, &evrregs.acc);
if (regno == -1
|| regno == tdep->ppc_spefscr_regnum)
regcache_raw_supply (regcache, tdep->ppc_spefscr_regnum,
&evrregs.spefscr);
}
static void
fetch_register (struct regcache *regcache, int tid, int regno)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* This isn't really an address. But ptrace thinks of it as one. */
CORE_ADDR regaddr = ppc_register_u_addr (regno);
int bytes_transferred;
unsigned int offset; /* Offset of registers within the u area. */
char buf[MAX_REGISTER_SIZE];
if (altivec_register_p (regno))
{
/* If this is the first time through, or if it is not the first
time through, and we have comfirmed that there is kernel
support for such a ptrace request, then go and fetch the
register. */
if (have_ptrace_getvrregs)
{
fetch_altivec_register (regcache, tid, regno);
return;
}
/* If we have discovered that there is no ptrace support for
AltiVec registers, fall through and return zeroes, because
regaddr will be -1 in this case. */
}
else if (spe_register_p (regno))
{
fetch_spe_register (regcache, tid, regno);
return;
}
if (regaddr == -1)
{
memset (buf, '\0', register_size (current_gdbarch, regno)); /* Supply zeroes */
regcache_raw_supply (regcache, regno, buf);
return;
}
/* Read the raw register using sizeof(long) sized chunks. On a
32-bit platform, 64-bit floating-point registers will require two
transfers. */
for (bytes_transferred = 0;
bytes_transferred < register_size (current_gdbarch, regno);
bytes_transferred += sizeof (long))
{
errno = 0;
*(long *) &buf[bytes_transferred]
= ptrace (PTRACE_PEEKUSER, tid, (PTRACE_TYPE_ARG3) regaddr, 0);
regaddr += sizeof (long);
if (errno != 0)
{
char message[128];
sprintf (message, "reading register %s (#%d)",
REGISTER_NAME (regno), regno);
perror_with_name (message);
}
}
/* Now supply the register. Keep in mind that the regcache's idea
of the register's size may not be a multiple of sizeof
(long). */
if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE)
{
/* Little-endian values are always found at the left end of the
bytes transferred. */
regcache_raw_supply (regcache, regno, buf);
}
else if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
{
/* Big-endian values are found at the right end of the bytes
transferred. */
size_t padding = (bytes_transferred
- register_size (current_gdbarch, regno));
regcache_raw_supply (regcache, regno, buf + padding);
}
else
internal_error (__FILE__, __LINE__,
_("fetch_register: unexpected byte order: %d"),
gdbarch_byte_order (current_gdbarch));
}
static void
supply_vrregset (struct regcache *regcache, gdb_vrregset_t *vrregsetp)
{
int i;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum);
int offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum);
for (i = 0; i < num_of_vrregs; i++)
{
/* The last 2 registers of this set are only 32 bit long, not
128. However an offset is necessary only for VSCR because it
occupies a whole vector, while VRSAVE occupies a full 4 bytes
slot. */
if (i == (num_of_vrregs - 2))
regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i,
*vrregsetp + i * vrregsize + offset);
else
regcache_raw_supply (regcache, tdep->ppc_vr0_regnum + i,
*vrregsetp + i * vrregsize);
}
}
static void
fetch_altivec_registers (struct regcache *regcache, int tid)
{
int ret;
gdb_vrregset_t regs;
ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name (_("Unable to fetch AltiVec registers"));
}
supply_vrregset (regcache, &regs);
}
static void
fetch_ppc_registers (struct regcache *regcache, int tid)
{
int i;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
for (i = 0; i < ppc_num_gprs; i++)
fetch_register (regcache, tid, tdep->ppc_gp0_regnum + i);
if (tdep->ppc_fp0_regnum >= 0)
for (i = 0; i < ppc_num_fprs; i++)
fetch_register (regcache, tid, tdep->ppc_fp0_regnum + i);
fetch_register (regcache, tid, PC_REGNUM);
if (tdep->ppc_ps_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_ps_regnum);
if (tdep->ppc_cr_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_cr_regnum);
if (tdep->ppc_lr_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_lr_regnum);
if (tdep->ppc_ctr_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_ctr_regnum);
if (tdep->ppc_xer_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_xer_regnum);
if (tdep->ppc_mq_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_mq_regnum);
if (tdep->ppc_fpscr_regnum != -1)
fetch_register (regcache, tid, tdep->ppc_fpscr_regnum);
if (have_ptrace_getvrregs)
if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
fetch_altivec_registers (regcache, tid);
if (tdep->ppc_ev0_upper_regnum >= 0)
fetch_spe_register (regcache, tid, -1);
}
/* Fetch registers from the child process. Fetch all registers if
regno == -1, otherwise fetch all general registers or all floating
point registers depending upon the value of regno. */
static void
ppc_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
{
/* Overload thread id onto process id */
int tid = TIDGET (inferior_ptid);
/* No thread id, just use process id */
if (tid == 0)
tid = PIDGET (inferior_ptid);
if (regno == -1)
fetch_ppc_registers (regcache, tid);
else
fetch_register (regcache, tid, regno);
}
/* Store one register. */
static void
store_altivec_register (const struct regcache *regcache, int tid, int regno)
{
int ret;
int offset = 0;
gdb_vrregset_t regs;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum);
ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name (_("Unable to fetch AltiVec register"));
}
/* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
long on the hardware. */
if (regno == (tdep->ppc_vrsave_regnum - 1))
offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum);
regcache_raw_collect (regcache, regno,
regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
ret = ptrace (PTRACE_SETVRREGS, tid, 0, &regs);
if (ret < 0)
perror_with_name (_("Unable to store AltiVec register"));
}
/* Assuming TID referrs to an SPE process, set the top halves of TID's
general-purpose registers and its SPE-specific registers to the
values in EVRREGSET. If we don't support PTRACE_SETEVRREGS, do
nothing.
All the logic to deal with whether or not the PTRACE_GETEVRREGS and
PTRACE_SETEVRREGS requests are supported is isolated here, and in
get_spe_registers. */
static void
set_spe_registers (int tid, struct gdb_evrregset_t *evrregset)
{
if (have_ptrace_getsetevrregs)
{
if (ptrace (PTRACE_SETEVRREGS, tid, 0, evrregset) >= 0)
return;
else
{
/* EIO means that the PTRACE_SETEVRREGS request isn't
supported; we fail silently, and don't try the call
again. */
if (errno == EIO)
have_ptrace_getsetevrregs = 0;
else
/* Anything else needs to be reported. */
perror_with_name (_("Unable to set SPE registers"));
}
}
}
/* Write GDB's value for the SPE-specific raw register REGNO to TID.
If REGNO is -1, write the values of all the SPE-specific
registers. */
static void
store_spe_register (const struct regcache *regcache, int tid, int regno)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
struct gdb_evrregset_t evrregs;
gdb_assert (sizeof (evrregs.evr[0])
== register_size (current_gdbarch, tdep->ppc_ev0_upper_regnum));
gdb_assert (sizeof (evrregs.acc)
== register_size (current_gdbarch, tdep->ppc_acc_regnum));
gdb_assert (sizeof (evrregs.spefscr)
== register_size (current_gdbarch, tdep->ppc_spefscr_regnum));
if (regno == -1)
/* Since we're going to write out every register, the code below
should store to every field of evrregs; if that doesn't happen,
make it obvious by initializing it with suspicious values. */
memset (&evrregs, 42, sizeof (evrregs));
else
/* We can only read and write the entire EVR register set at a
time, so to write just a single register, we do a
read-modify-write maneuver. */
get_spe_registers (tid, &evrregs);
if (regno == -1)
{
int i;
for (i = 0; i < ppc_num_gprs; i++)
regcache_raw_collect (regcache,
tdep->ppc_ev0_upper_regnum + i,
&evrregs.evr[i]);
}
else if (tdep->ppc_ev0_upper_regnum <= regno
&& regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs)
regcache_raw_collect (regcache, regno,
&evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]);
if (regno == -1
|| regno == tdep->ppc_acc_regnum)
regcache_raw_collect (regcache,
tdep->ppc_acc_regnum,
&evrregs.acc);
if (regno == -1
|| regno == tdep->ppc_spefscr_regnum)
regcache_raw_collect (regcache,
tdep->ppc_spefscr_regnum,
&evrregs.spefscr);
/* Write back the modified register set. */
set_spe_registers (tid, &evrregs);
}
static void
store_register (const struct regcache *regcache, int tid, int regno)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* This isn't really an address. But ptrace thinks of it as one. */
CORE_ADDR regaddr = ppc_register_u_addr (regno);
int i;
size_t bytes_to_transfer;
char buf[MAX_REGISTER_SIZE];
if (altivec_register_p (regno))
{
store_altivec_register (regcache, tid, regno);
return;
}
else if (spe_register_p (regno))
{
store_spe_register (regcache, tid, regno);
return;
}
if (regaddr == -1)
return;
/* First collect the register. Keep in mind that the regcache's
idea of the register's size may not be a multiple of sizeof
(long). */
memset (buf, 0, sizeof buf);
bytes_to_transfer = align_up (register_size (current_gdbarch, regno),
sizeof (long));
if (TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)
{
/* Little-endian values always sit at the left end of the buffer. */
regcache_raw_collect (regcache, regno, buf);
}
else if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
/* Big-endian values sit at the right end of the buffer. */
size_t padding = (bytes_to_transfer
- register_size (current_gdbarch, regno));
regcache_raw_collect (regcache, regno, buf + padding);
}
for (i = 0; i < bytes_to_transfer; i += sizeof (long))
{
errno = 0;
ptrace (PTRACE_POKEUSER, tid, (PTRACE_TYPE_ARG3) regaddr,
*(long *) &buf[i]);
regaddr += sizeof (long);
if (errno == EIO
&& regno == tdep->ppc_fpscr_regnum)
{
/* Some older kernel versions don't allow fpscr to be written. */
continue;
}
if (errno != 0)
{
char message[128];
sprintf (message, "writing register %s (#%d)",
REGISTER_NAME (regno), regno);
perror_with_name (message);
}
}
}
static void
fill_vrregset (const struct regcache *regcache, gdb_vrregset_t *vrregsetp)
{
int i;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
int vrregsize = register_size (current_gdbarch, tdep->ppc_vr0_regnum);
int offset = vrregsize - register_size (current_gdbarch, tdep->ppc_vrsave_regnum);
for (i = 0; i < num_of_vrregs; i++)
{
/* The last 2 registers of this set are only 32 bit long, not
128, but only VSCR is fetched as a 16 bytes quantity. */
if (i == (num_of_vrregs - 2))
regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i,
*vrregsetp + i * vrregsize + offset);
else
regcache_raw_collect (regcache, tdep->ppc_vr0_regnum + i,
*vrregsetp + i * vrregsize);
}
}
static void
store_altivec_registers (const struct regcache *regcache, int tid)
{
int ret;
gdb_vrregset_t regs;
ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
if (ret < 0)
{
if (errno == EIO)
{
have_ptrace_getvrregs = 0;
return;
}
perror_with_name (_("Couldn't get AltiVec registers"));
}
fill_vrregset (regcache, &regs);
if (ptrace (PTRACE_SETVRREGS, tid, 0, &regs) < 0)
perror_with_name (_("Couldn't write AltiVec registers"));
}
static void
store_ppc_registers (const struct regcache *regcache, int tid)
{
int i;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
for (i = 0; i < ppc_num_gprs; i++)
store_register (regcache, tid, tdep->ppc_gp0_regnum + i);
if (tdep->ppc_fp0_regnum >= 0)
for (i = 0; i < ppc_num_fprs; i++)
store_register (regcache, tid, tdep->ppc_fp0_regnum + i);
store_register (regcache, tid, PC_REGNUM);
if (tdep->ppc_ps_regnum != -1)
store_register (regcache, tid, tdep->ppc_ps_regnum);
if (tdep->ppc_cr_regnum != -1)
store_register (regcache, tid, tdep->ppc_cr_regnum);
if (tdep->ppc_lr_regnum != -1)
store_register (regcache, tid, tdep->ppc_lr_regnum);
if (tdep->ppc_ctr_regnum != -1)
store_register (regcache, tid, tdep->ppc_ctr_regnum);
if (tdep->ppc_xer_regnum != -1)
store_register (regcache, tid, tdep->ppc_xer_regnum);
if (tdep->ppc_mq_regnum != -1)
store_register (regcache, tid, tdep->ppc_mq_regnum);
if (tdep->ppc_fpscr_regnum != -1)
store_register (regcache, tid, tdep->ppc_fpscr_regnum);
if (have_ptrace_getvrregs)
if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
store_altivec_registers (regcache, tid);
if (tdep->ppc_ev0_upper_regnum >= 0)
store_spe_register (regcache, tid, -1);
}
static int
ppc_linux_check_watch_resources (int type, int cnt, int ot)
{
int tid;
ptid_t ptid = inferior_ptid;
/* DABR (data address breakpoint register) is optional for PPC variants.
Some variants have one DABR, others have none. So CNT can't be larger
than 1. */
if (cnt > 1)
return 0;
/* We need to know whether ptrace supports PTRACE_SET_DEBUGREG and whether
the target has DABR. If either answer is no, the ptrace call will
return -1. Fail in that case. */
tid = TIDGET (ptid);
if (tid == 0)
tid = PIDGET (ptid);
if (ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0) == -1)
return 0;
return 1;
}
static int
ppc_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
/* Handle sub-8-byte quantities. */
if (len <= 0)
return 0;
/* addr+len must fall in the 8 byte watchable region. */
if ((addr + len) > (addr & ~7) + 8)
return 0;
return 1;
}
/* Set a watchpoint of type TYPE at address ADDR. */
static int
ppc_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw)
{
int tid;
long dabr_value;
ptid_t ptid = inferior_ptid;
dabr_value = addr & ~7;
switch (rw)
{
case hw_read:
/* Set read and translate bits. */
dabr_value |= 5;
break;
case hw_write:
/* Set write and translate bits. */
dabr_value |= 6;
break;
case hw_access:
/* Set read, write and translate bits. */
dabr_value |= 7;
break;
}
tid = TIDGET (ptid);
if (tid == 0)
tid = PIDGET (ptid);
return ptrace (PTRACE_SET_DEBUGREG, tid, 0, dabr_value);
}
static int
ppc_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw)
{
int tid;
ptid_t ptid = inferior_ptid;
tid = TIDGET (ptid);
if (tid == 0)
tid = PIDGET (ptid);
return ptrace (PTRACE_SET_DEBUGREG, tid, 0, 0);
}
static int
ppc_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
{
if (last_stopped_data_address)
{
*addr_p = last_stopped_data_address;
last_stopped_data_address = 0;
return 1;
}
return 0;
}
static int
ppc_linux_stopped_by_watchpoint (void)
{
int tid;
struct siginfo siginfo;
ptid_t ptid = inferior_ptid;
CORE_ADDR *addr_p;
tid = TIDGET(ptid);
if (tid == 0)
tid = PIDGET (ptid);
errno = 0;
ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_TYPE_ARG3) 0, &siginfo);
if (errno != 0 || siginfo.si_signo != SIGTRAP ||
(siginfo.si_code & 0xffff) != 0x0004)
return 0;
last_stopped_data_address = (uintptr_t) siginfo.si_addr;
return 1;
}
static void
ppc_linux_store_inferior_registers (struct regcache *regcache, int regno)
{
/* Overload thread id onto process id */
int tid = TIDGET (inferior_ptid);
/* No thread id, just use process id */
if (tid == 0)
tid = PIDGET (inferior_ptid);
if (regno >= 0)
store_register (regcache, tid, regno);
else
store_ppc_registers (regcache, tid);
}
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
/* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
interface, and not the wordsize of the program's ABI. */
int wordsize = sizeof (long);
ppc_linux_supply_gregset (regcache, -1, gregsetp,
sizeof (gdb_gregset_t), wordsize);
}
static void
right_fill_reg (const struct regcache *regcache, int regnum, void *reg)
{
/* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
interface, and not the wordsize of the program's ABI. */
int wordsize = sizeof (long);
/* Right fill the register. */
regcache_raw_collect (regcache, regnum,
((bfd_byte *) reg
+ wordsize
- register_size (current_gdbarch, regnum)));
}
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regno)
{
int regi;
elf_greg_t *regp = (elf_greg_t *) gregsetp;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
const int elf_ngreg = 48;
/* Start with zeros. */
memset (regp, 0, elf_ngreg * sizeof (*regp));
for (regi = 0; regi < ppc_num_gprs; regi++)
{
if ((regno == -1) || regno == tdep->ppc_gp0_regnum + regi)
right_fill_reg (regcache, tdep->ppc_gp0_regnum + regi,
(regp + PT_R0 + regi));
}
if ((regno == -1) || regno == PC_REGNUM)
right_fill_reg (regcache, PC_REGNUM, regp + PT_NIP);
if ((regno == -1) || regno == tdep->ppc_lr_regnum)
right_fill_reg (regcache, tdep->ppc_lr_regnum, regp + PT_LNK);
if ((regno == -1) || regno == tdep->ppc_cr_regnum)
regcache_raw_collect (regcache, tdep->ppc_cr_regnum,
regp + PT_CCR);
if ((regno == -1) || regno == tdep->ppc_xer_regnum)
regcache_raw_collect (regcache, tdep->ppc_xer_regnum,
regp + PT_XER);
if ((regno == -1) || regno == tdep->ppc_ctr_regnum)
right_fill_reg (regcache, tdep->ppc_ctr_regnum, regp + PT_CTR);
#ifdef PT_MQ
if (((regno == -1) || regno == tdep->ppc_mq_regnum)
&& (tdep->ppc_mq_regnum != -1))
right_fill_reg (regcache, tdep->ppc_mq_regnum, regp + PT_MQ);
#endif
if ((regno == -1) || regno == tdep->ppc_ps_regnum)
right_fill_reg (regcache, tdep->ppc_ps_regnum, regp + PT_MSR);
}
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp)
{
ppc_linux_supply_fpregset (NULL, regcache, -1, fpregsetp,
sizeof (gdb_fpregset_t));
}
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), update the register specified by REGNO from gdb's
idea of the current floating point register set. If REGNO is -1,
update them all. */
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regno)
{
int regi;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
bfd_byte *fpp = (void *) fpregsetp;
if (ppc_floating_point_unit_p (current_gdbarch))
{
for (regi = 0; regi < ppc_num_fprs; regi++)
{
if ((regno == -1) || (regno == tdep->ppc_fp0_regnum + regi))
regcache_raw_collect (regcache, tdep->ppc_fp0_regnum + regi,
fpp + 8 * regi);
}
if (regno == -1 || regno == tdep->ppc_fpscr_regnum)
right_fill_reg (regcache, tdep->ppc_fpscr_regnum, (fpp + 8 * 32));
}
}
void _initialize_ppc_linux_nat (void);
void
_initialize_ppc_linux_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 = ppc_linux_fetch_inferior_registers;
t->to_store_registers = ppc_linux_store_inferior_registers;
/* Add our watchpoint methods. */
t->to_can_use_hw_breakpoint = ppc_linux_check_watch_resources;
t->to_region_ok_for_hw_watchpoint = ppc_linux_region_ok_for_hw_watchpoint;
t->to_insert_watchpoint = ppc_linux_insert_watchpoint;
t->to_remove_watchpoint = ppc_linux_remove_watchpoint;
t->to_stopped_by_watchpoint = ppc_linux_stopped_by_watchpoint;
t->to_stopped_data_address = ppc_linux_stopped_data_address;
/* Register the target. */
linux_nat_add_target (t);
}
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