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

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/* GNU/Linux on ARM native support.
Copyright (C) 1999, 2000, 2001, 2002, 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 "inferior.h"
#include "gdbcore.h"
#include "gdb_string.h"
#include "regcache.h"
#include "target.h"
#include "linux-nat.h"
#include "target-descriptions.h"
#include "xml-support.h"
#include "arm-tdep.h"
#include "arm-linux-tdep.h"
#include <sys/user.h>
#include <sys/ptrace.h>
#include <sys/utsname.h>
#include <sys/procfs.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* Defines ps_err_e, struct ps_prochandle. */
#include "gdb_proc_service.h"
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 22
#endif
#ifndef PTRACE_GETWMMXREGS
#define PTRACE_GETWMMXREGS 18
#define PTRACE_SETWMMXREGS 19
#endif
/* A flag for whether the WMMX registers are available. */
static int arm_linux_has_wmmx_registers;
extern int arm_apcs_32;
/* The following variables are used to determine the version of the
underlying GNU/Linux operating system. Examples:
GNU/Linux 2.0.35 GNU/Linux 2.2.12
os_version = 0x00020023 os_version = 0x0002020c
os_major = 2 os_major = 2
os_minor = 0 os_minor = 2
os_release = 35 os_release = 12
Note: os_version = (os_major << 16) | (os_minor << 8) | os_release
These are initialized using get_linux_version() from
_initialize_arm_linux_nat(). */
static unsigned int os_version, os_major, os_minor, os_release;
/* On GNU/Linux, threads are implemented as pseudo-processes, in which
case we may be tracing more than one process at a time. In that
case, inferior_ptid will contain the main process ID and the
individual thread (process) ID. get_thread_id () is used to get
the thread id if it's available, and the process id otherwise. */
int
get_thread_id (ptid_t ptid)
{
int tid = TIDGET (ptid);
if (0 == tid)
tid = PIDGET (ptid);
return tid;
}
#define GET_THREAD_ID(PTID) get_thread_id (PTID)
/* Get the value of a particular register from the floating point
state of the process and store it into regcache. */
static void
fetch_fpregister (struct regcache *regcache, int regno)
{
int ret, tid;
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
ret = ptrace (PT_GETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to fetch floating point register."));
return;
}
/* Fetch fpsr. */
if (ARM_FPS_REGNUM == regno)
regcache_raw_supply (regcache, ARM_FPS_REGNUM,
fp + NWFPE_FPSR_OFFSET);
/* Fetch the floating point register. */
if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
supply_nwfpe_register (regcache, regno, fp);
}
/* Get the whole floating point state of the process and store it
into regcache. */
static void
fetch_fpregs (struct regcache *regcache)
{
int ret, regno, tid;
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
ret = ptrace (PT_GETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
return;
}
/* Fetch fpsr. */
regcache_raw_supply (regcache, ARM_FPS_REGNUM,
fp + NWFPE_FPSR_OFFSET);
/* Fetch the floating point registers. */
for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
supply_nwfpe_register (regcache, regno, fp);
}
/* Save a particular register into the floating point state of the
process using the contents from regcache. */
static void
store_fpregister (const struct regcache *regcache, int regno)
{
int ret, tid;
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
ret = ptrace (PT_GETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
return;
}
/* Store fpsr. */
if (ARM_FPS_REGNUM == regno && regcache_valid_p (regcache, ARM_FPS_REGNUM))
regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
/* Store the floating point register. */
if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
collect_nwfpe_register (regcache, regno, fp);
ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to store floating point register."));
return;
}
}
/* Save the whole floating point state of the process using
the contents from regcache. */
static void
store_fpregs (const struct regcache *regcache)
{
int ret, regno, tid;
gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Read the floating point state. */
ret = ptrace (PT_GETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to fetch the floating point registers."));
return;
}
/* Store fpsr. */
if (regcache_valid_p (regcache, ARM_FPS_REGNUM))
regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
/* Store the floating point registers. */
for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
if (regcache_valid_p (regcache, regno))
collect_nwfpe_register (regcache, regno, fp);
ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
if (ret < 0)
{
warning (_("Unable to store floating point registers."));
return;
}
}
/* Fetch a general register of the process and store into
regcache. */
static void
fetch_register (struct regcache *regcache, int regno)
{
int ret, tid;
elf_gregset_t regs;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to fetch general register."));
return;
}
if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM)
regcache_raw_supply (regcache, regno, (char *) &regs[regno]);
if (ARM_PS_REGNUM == regno)
{
if (arm_apcs_32)
regcache_raw_supply (regcache, ARM_PS_REGNUM,
(char *) &regs[ARM_CPSR_REGNUM]);
else
regcache_raw_supply (regcache, ARM_PS_REGNUM,
(char *) &regs[ARM_PC_REGNUM]);
}
if (ARM_PC_REGNUM == regno)
{
regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
(current_gdbarch, regs[ARM_PC_REGNUM]);
regcache_raw_supply (regcache, ARM_PC_REGNUM,
(char *) &regs[ARM_PC_REGNUM]);
}
}
/* Fetch all general registers of the process and store into
regcache. */
static void
fetch_regs (struct regcache *regcache)
{
int ret, regno, tid;
elf_gregset_t regs;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to fetch general registers."));
return;
}
for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
regcache_raw_supply (regcache, regno, (char *) &regs[regno]);
if (arm_apcs_32)
regcache_raw_supply (regcache, ARM_PS_REGNUM,
(char *) &regs[ARM_CPSR_REGNUM]);
else
regcache_raw_supply (regcache, ARM_PS_REGNUM,
(char *) &regs[ARM_PC_REGNUM]);
regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
(current_gdbarch, regs[ARM_PC_REGNUM]);
regcache_raw_supply (regcache, ARM_PC_REGNUM,
(char *) &regs[ARM_PC_REGNUM]);
}
/* Store all general registers of the process from the values in
regcache. */
static void
store_register (const struct regcache *regcache, int regno)
{
int ret, tid;
elf_gregset_t regs;
if (!regcache_valid_p (regcache, regno))
return;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Get the general registers from the process. */
ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to fetch general registers."));
return;
}
if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)
regcache_raw_collect (regcache, regno, (char *) &regs[regno]);
else if (arm_apcs_32 && regno == ARM_PS_REGNUM)
regcache_raw_collect (regcache, regno,
(char *) &regs[ARM_CPSR_REGNUM]);
else if (!arm_apcs_32 && regno == ARM_PS_REGNUM)
regcache_raw_collect (regcache, ARM_PC_REGNUM,
(char *) &regs[ARM_PC_REGNUM]);
ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to store general register."));
return;
}
}
static void
store_regs (const struct regcache *regcache)
{
int ret, regno, tid;
elf_gregset_t regs;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
/* Fetch the general registers. */
ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to fetch general registers."));
return;
}
for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
{
if (regcache_valid_p (regcache, regno))
regcache_raw_collect (regcache, regno, (char *) &regs[regno]);
}
if (arm_apcs_32 && regcache_valid_p (regcache, ARM_PS_REGNUM))
regcache_raw_collect (regcache, ARM_PS_REGNUM,
(char *) &regs[ARM_CPSR_REGNUM]);
ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
if (ret < 0)
{
warning (_("Unable to store general registers."));
return;
}
}
/* Fetch all WMMX registers of the process and store into
regcache. */
#define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4)
static void
fetch_wmmx_regs (struct regcache *regcache)
{
char regbuf[IWMMXT_REGS_SIZE];
int ret, regno, tid;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
if (ret < 0)
{
warning (_("Unable to fetch WMMX registers."));
return;
}
for (regno = 0; regno < 16; regno++)
regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM,
&regbuf[regno * 8]);
for (regno = 0; regno < 2; regno++)
regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM,
&regbuf[16 * 8 + regno * 4]);
for (regno = 0; regno < 4; regno++)
regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM,
&regbuf[16 * 8 + 2 * 4 + regno * 4]);
}
static void
store_wmmx_regs (const struct regcache *regcache)
{
char regbuf[IWMMXT_REGS_SIZE];
int ret, regno, tid;
/* Get the thread id for the ptrace call. */
tid = GET_THREAD_ID (inferior_ptid);
ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
if (ret < 0)
{
warning (_("Unable to fetch WMMX registers."));
return;
}
for (regno = 0; regno < 16; regno++)
if (regcache_valid_p (regcache, regno + ARM_WR0_REGNUM))
regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM,
&regbuf[regno * 8]);
for (regno = 0; regno < 2; regno++)
if (regcache_valid_p (regcache, regno + ARM_WCSSF_REGNUM))
regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM,
&regbuf[16 * 8 + regno * 4]);
for (regno = 0; regno < 4; regno++)
if (regcache_valid_p (regcache, regno + ARM_WCGR0_REGNUM))
regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM,
&regbuf[16 * 8 + 2 * 4 + regno * 4]);
ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf);
if (ret < 0)
{
warning (_("Unable to store WMMX registers."));
return;
}
}
/* 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
arm_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
{
if (-1 == regno)
{
fetch_regs (regcache);
fetch_fpregs (regcache);
if (arm_linux_has_wmmx_registers)
fetch_wmmx_regs (regcache);
}
else
{
if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
fetch_register (regcache, regno);
else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)
fetch_fpregister (regcache, regno);
else if (arm_linux_has_wmmx_registers
&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
fetch_wmmx_regs (regcache);
}
}
/* Store registers back into the inferior. Store all registers if
regno == -1, otherwise store all general registers or all floating
point registers depending upon the value of regno. */
static void
arm_linux_store_inferior_registers (struct regcache *regcache, int regno)
{
if (-1 == regno)
{
store_regs (regcache);
store_fpregs (regcache);
if (arm_linux_has_wmmx_registers)
store_wmmx_regs (regcache);
}
else
{
if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
store_register (regcache, regno);
else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))
store_fpregister (regcache, regno);
else if (arm_linux_has_wmmx_registers
&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
store_wmmx_regs (regcache);
}
}
/* Wrapper functions for the standard regset handling, used by
thread debugging. */
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regno)
{
arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0);
}
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0);
}
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regno)
{
arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0);
}
/* Fill GDB's register array with the floating-point register values
in *fpregsetp. */
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0);
}
/* Fetch the thread-local storage pointer for libthread_db. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
return PS_ERR;
/* IDX is the bias from the thread pointer to the beginning of the
thread descriptor. It has to be subtracted due to implementation
quirks in libthread_db. */
*base = (void *) ((char *)*base - idx);
return PS_OK;
}
static unsigned int
get_linux_version (unsigned int *vmajor,
unsigned int *vminor,
unsigned int *vrelease)
{
struct utsname info;
char *pmajor, *pminor, *prelease, *tail;
if (-1 == uname (&info))
{
warning (_("Unable to determine GNU/Linux version."));
return -1;
}
pmajor = strtok (info.release, ".");
pminor = strtok (NULL, ".");
prelease = strtok (NULL, ".");
*vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
*vminor = (unsigned int) strtoul (pminor, &tail, 0);
*vrelease = (unsigned int) strtoul (prelease, &tail, 0);
return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
}
static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object,
const char *, gdb_byte *, const gdb_byte *,
ULONGEST, LONGEST);
static LONGEST
arm_linux_xfer_partial (struct target_ops *ops,
enum target_object object,
const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (object == TARGET_OBJECT_AVAILABLE_FEATURES)
{
if (annex != NULL && strcmp (annex, "target.xml") == 0)
{
int ret;
char regbuf[IWMMXT_REGS_SIZE];
ret = ptrace (PTRACE_GETWMMXREGS, GET_THREAD_ID (inferior_ptid),
0, regbuf);
if (ret < 0)
arm_linux_has_wmmx_registers = 0;
else
arm_linux_has_wmmx_registers = 1;
if (arm_linux_has_wmmx_registers)
annex = "arm-with-iwmmxt.xml";
else
return -1;
}
return xml_builtin_xfer_partial (annex, readbuf, writebuf, offset, len);
}
return super_xfer_partial (ops, object, annex, readbuf, writebuf,
offset, len);
}
void _initialize_arm_linux_nat (void);
void
_initialize_arm_linux_nat (void)
{
struct target_ops *t;
os_version = get_linux_version (&os_major, &os_minor, &os_release);
/* Fill in the generic GNU/Linux methods. */
t = linux_target ();
/* Add our register access methods. */
t->to_fetch_registers = arm_linux_fetch_inferior_registers;
t->to_store_registers = arm_linux_store_inferior_registers;
/* Override the default to_xfer_partial. */
super_xfer_partial = t->to_xfer_partial;
t->to_xfer_partial = arm_linux_xfer_partial;
/* Register the target. */
linux_nat_add_target (t);
}
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