-/* Motorola m68k native support for Linux
- Copyright 1996, 1998, 2000, 2001 Free Software Foundation, Inc.
+/* Motorola m68k native support for GNU/Linux.
+
+ Copyright (C) 1996-2016 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
+ 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,
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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "frame.h"
#include "language.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "target.h"
+#include "linux-nat.h"
-#ifdef USG
-#include <sys/types.h>
-#endif
+#include "m68k-tdep.h"
-#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
+#include "nat/gdb_ptrace.h"
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/procfs.h>
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
#include <sys/file.h>
-#include "gdb_stat.h"
+#include <sys/stat.h>
#include "floatformat.h"
-#include "target.h"
-\f
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
+/* Defines ps_err_e, struct ps_prochandle. */
+#include "gdb_proc_service.h"
-/* This table must line up with REGISTER_NAMES in tm-m68k.h */
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+\f
+/* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
static const int regmap[] =
{
PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
45, 46, 47
};
-/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
- is stored. */
+/* Which ptrace request retrieves which registers?
+ These apply to the corresponding SET requests as well. */
+#define NUM_GREGS (18)
+#define MAX_NUM_REGS (NUM_GREGS + 11)
-int
-m68k_linux_register_u_addr (int blockend, int regnum)
+static int
+getregs_supplies (int regno)
{
- return (blockend + 4 * regmap[regnum]);
+ return 0 <= regno && regno < NUM_GREGS;
}
-/* Given a pointer to a general register set in /proc format
- (elf_gregset_t *), unpack the register contents and supply
- them as gdb's idea of the current register values. */
+static int
+getfpregs_supplies (int regno)
+{
+ return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
+}
+/* Does the current host support the GETREGS request? */
+static int have_ptrace_getregs =
+#ifdef HAVE_PTRACE_GETREGS
+ 1
+#else
+ 0
+#endif
+;
-/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
- for supply_gregset and supply_fpregset. The definitions
- in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
- the definitions in m68klinux-nat.c will be used. This is a
- bit of a hack. The supply_* routines do not belong in
- *_tdep.c files. But, there are several lynx ports that currently
- depend on these definitions. */
+\f
-#ifndef USE_PROC_FS
+/* Fetching registers directly from the U area, one at a time. */
-/* Prototypes for supply_gregset etc. */
-#include "gregset.h"
+/* Fetch one register. */
-void
-supply_gregset (elf_gregset_t *gregsetp)
+static void
+fetch_register (struct regcache *regcache, int regno)
{
- int regi;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ long regaddr, val;
+ int i;
+ gdb_byte buf[MAX_REGISTER_SIZE];
+ int tid;
+
+ /* Overload thread id onto process id. */
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid); /* no thread id, just use
+ process id. */
+
+ regaddr = 4 * regmap[regno];
+ for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
+ {
+ errno = 0;
+ val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
+ memcpy (&buf[i], &val, sizeof (long));
+ regaddr += sizeof (long);
+ if (errno != 0)
+ error (_("Couldn't read register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regno),
+ regno, safe_strerror (errno));
+ }
+ regcache_raw_supply (regcache, regno, buf);
+}
- for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)
- supply_register (regi, (char *) (*gregsetp + regmap[regi]));
- supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
- supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
+/* Fetch register values from the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+
+static void
+old_fetch_inferior_registers (struct regcache *regcache, int regno)
+{
+ if (regno >= 0)
+ {
+ fetch_register (regcache, regno);
+ }
+ else
+ {
+ for (regno = 0;
+ regno < gdbarch_num_regs (get_regcache_arch (regcache));
+ regno++)
+ {
+ fetch_register (regcache, regno);
+ }
+ }
}
-/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), unpack the register contents and supply them as gdb's
- idea of the current floating point register values. */
+/* Store one register. */
-void
-supply_fpregset (elf_fpregset_t *fpregsetp)
+static void
+store_register (const struct regcache *regcache, int regno)
{
- int regi;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ long regaddr, val;
+ int i;
+ int tid;
+ gdb_byte buf[MAX_REGISTER_SIZE];
- for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
- supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
- supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
- supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
- supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
+ /* Overload thread id onto process id. */
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid); /* no thread id, just use
+ process id. */
+
+ regaddr = 4 * regmap[regno];
+
+ /* Put the contents of regno into a local buffer. */
+ regcache_raw_collect (regcache, regno, buf);
+
+ /* Store the local buffer into the inferior a chunk at the time. */
+ for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
+ {
+ errno = 0;
+ memcpy (&val, &buf[i], sizeof (long));
+ ptrace (PTRACE_POKEUSER, tid, regaddr, val);
+ regaddr += sizeof (long);
+ if (errno != 0)
+ error (_("Couldn't write register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regno),
+ regno, safe_strerror (errno));
+ }
}
-#endif
+/* Store our register values back into the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+static void
+old_store_inferior_registers (const struct regcache *regcache, int regno)
+{
+ if (regno >= 0)
+ {
+ store_register (regcache, regno);
+ }
+ else
+ {
+ for (regno = 0;
+ regno < gdbarch_num_regs (get_regcache_arch (regcache));
+ regno++)
+ {
+ store_register (regcache, regno);
+ }
+ }
+}
\f
-/* Interpreting register set info found in core files. */
+/* Given a pointer to a general register set in /proc format
+ (elf_gregset_t *), unpack the register contents and supply
+ them as gdb's idea of the current register values. */
+
+void
+supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
+ int regi;
-/* Provide registers to GDB from a core file.
+ for (regi = M68K_D0_REGNUM;
+ regi <= gdbarch_sp_regnum (gdbarch);
+ regi++)
+ regcache_raw_supply (regcache, regi, ®p[regmap[regi]]);
+ regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch),
+ ®p[PT_SR]);
+ regcache_raw_supply (regcache,
+ gdbarch_pc_regnum (gdbarch), ®p[PT_PC]);
+}
- (We can't use the generic version of this function in
- core-regset.c, because we need to use elf_gregset_t instead of
- gregset_t.)
+/* Fill register REGNO (if it is a general-purpose register) in
+ *GREGSETPS with the value in GDB's register array. If REGNO is -1,
+ do this for all registers. */
+void
+fill_gregset (const struct regcache *regcache,
+ elf_gregset_t *gregsetp, int regno)
+{
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int i;
- CORE_REG_SECT points to an array of bytes, which are the contents
- of a `note' from a core file which BFD thinks might contain
- register contents. CORE_REG_SIZE is its size.
+ for (i = 0; i < NUM_GREGS; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (regcache, i, regp + regmap[i]);
+}
- WHICH says which register set corelow suspects this is:
- 0 --- the general-purpose register set, in elf_gregset_t format
- 2 --- the floating-point register set, in elf_fpregset_t format
+#ifdef HAVE_PTRACE_GETREGS
- REG_ADDR isn't used on Linux. */
+/* Fetch all general-purpose registers from process/thread TID and
+ store their values in GDB's register array. */
static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
- int which, CORE_ADDR reg_addr)
+fetch_regs (struct regcache *regcache, int tid)
{
- elf_gregset_t gregset;
- elf_fpregset_t fpregset;
+ elf_gregset_t regs;
- switch (which)
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
{
- case 0:
- if (core_reg_size != sizeof (gregset))
- warning ("Wrong size gregset in core file.");
- else
+ if (errno == EIO)
{
- memcpy (&gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
+ /* The kernel we're running on doesn't support the GETREGS
+ request. Reset `have_ptrace_getregs'. */
+ have_ptrace_getregs = 0;
+ return;
}
- break;
- case 2:
- if (core_reg_size != sizeof (fpregset))
- warning ("Wrong size fpregset in core file.");
- else
- {
- memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
- supply_fpregset (&fpregset);
- }
- break;
-
- default:
- /* We've covered all the kinds of registers we know about here,
- so this must be something we wouldn't know what to do with
- anyway. Just ignore it. */
- break;
+ perror_with_name (_("Couldn't get registers"));
}
+
+ supply_gregset (regcache, (const elf_gregset_t *) ®s);
+}
+
+/* Store all valid general-purpose registers in GDB's register array
+ into the process/thread specified by TID. */
+
+static void
+store_regs (const struct regcache *regcache, int tid, int regno)
+{
+ elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name (_("Couldn't get registers"));
+
+ fill_gregset (regcache, ®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name (_("Couldn't write registers"));
+}
+
+#else
+
+static void fetch_regs (struct regcache *regcache, int tid)
+{
}
+
+static void store_regs (const struct regcache *regcache, int tid, int regno)
+{
+}
+
+#endif
+
\f
+/* Transfering floating-point registers between GDB, inferiors and cores. */
+
+/* What is the address of fpN within the floating-point register set F? */
+#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
+
+/* Fill GDB's register array with the floating-point register values in
+ *FPREGSETP. */
+
+void
+supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int regi;
+
+ for (regi = gdbarch_fp0_regnum (gdbarch);
+ regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
+ regcache_raw_supply (regcache, regi,
+ FPREG_ADDR (fpregsetp,
+ regi - gdbarch_fp0_regnum (gdbarch)));
+ regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
+ regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
+ regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
+}
+
+/* Fill register REGNO (if it is a floating-point register) in
+ *FPREGSETP with the value in GDB's register array. If REGNO is -1,
+ do this for all registers. */
+
+void
+fill_fpregset (const struct regcache *regcache,
+ elf_fpregset_t *fpregsetp, int regno)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int i;
+
+ /* Fill in the floating-point registers. */
+ for (i = gdbarch_fp0_regnum (gdbarch);
+ i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (regcache, i,
+ FPREG_ADDR (fpregsetp,
+ i - gdbarch_fp0_regnum (gdbarch)));
+
+ /* Fill in the floating-point control registers. */
+ for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (regcache, i,
+ &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
+}
+
+#ifdef HAVE_PTRACE_GETREGS
+
+/* Fetch all floating-point registers from process/thread TID and store
+ thier values in GDB's register array. */
+
+static void
+fetch_fpregs (struct regcache *regcache, int tid)
+{
+ elf_fpregset_t fpregs;
-int
-kernel_u_size (void)
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
+}
+
+/* Store all valid floating-point registers in GDB's register array
+ into the process/thread specified by TID. */
+
+static void
+store_fpregs (const struct regcache *regcache, int tid, int regno)
+{
+ elf_fpregset_t fpregs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ fill_fpregset (regcache, &fpregs, regno);
+
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't write floating point status"));
+}
+
+#else
+
+static void fetch_fpregs (struct regcache *regcache, int tid)
+{
+}
+
+static void store_fpregs (const struct regcache *regcache, int tid, int regno)
{
- return (sizeof (struct user));
}
+
+#endif
\f
-/* Return non-zero if PC points into the signal trampoline. */
+/* Transferring arbitrary registers between GDB and inferior. */
+
+/* Fetch register REGNO from the child process. If REGNO is -1, do
+ this for all registers (including the floating point and SSE
+ registers). */
-int
-in_sigtramp (CORE_ADDR pc)
+static void
+m68k_linux_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
- CORE_ADDR sp;
- char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
- int insn;
+ int tid;
+
+ /* Use the old method of peeking around in `struct user' if the
+ GETREGS request isn't available. */
+ if (! have_ptrace_getregs)
+ {
+ old_fetch_inferior_registers (regcache, regno);
+ return;
+ }
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
+
+ /* Use the PTRACE_GETFPXREGS request whenever possible, since it
+ transfers more registers in one system call, and we'll cache the
+ results. But remember that fetch_fpxregs can fail, and return
+ zero. */
+ if (regno == -1)
+ {
+ fetch_regs (regcache, tid);
- sp = read_register (SP_REGNUM);
- if (pc - 2 < sp)
- return 0;
+ /* The call above might reset `have_ptrace_getregs'. */
+ if (! have_ptrace_getregs)
+ {
+ old_fetch_inferior_registers (regcache, -1);
+ return;
+ }
- if (read_memory_nobpt (pc, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
- return 1;
+ fetch_fpregs (regcache, tid);
+ return;
+ }
+
+ if (getregs_supplies (regno))
+ {
+ fetch_regs (regcache, tid);
+ return;
+ }
- if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
- return 1;
+ if (getfpregs_supplies (regno))
+ {
+ fetch_fpregs (regcache, tid);
+ return;
+ }
- return 0;
+ internal_error (__FILE__, __LINE__,
+ _("Got request for bad register number %d."), regno);
}
+/* Store register REGNO back into the child process. If REGNO is -1,
+ do this for all registers (including the floating point and SSE
+ registers). */
+static void
+m68k_linux_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
+{
+ int tid;
+
+ /* Use the old method of poking around in `struct user' if the
+ SETREGS request isn't available. */
+ if (! have_ptrace_getregs)
+ {
+ old_store_inferior_registers (regcache, regno);
+ return;
+ }
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
+
+ /* Use the PTRACE_SETFPREGS requests whenever possible, since it
+ transfers more registers in one system call. But remember that
+ store_fpregs can fail, and return zero. */
+ if (regno == -1)
+ {
+ store_regs (regcache, tid, regno);
+ store_fpregs (regcache, tid, regno);
+ return;
+ }
+
+ if (getregs_supplies (regno))
+ {
+ store_regs (regcache, tid, regno);
+ return;
+ }
+
+ if (getfpregs_supplies (regno))
+ {
+ store_fpregs (regcache, tid, regno);
+ return;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("Got request to store bad register number %d."), regno);
+}
\f
-/* Register that we are able to handle Linux ELF core file formats. */
-static struct core_fns linux_elf_core_fns =
+/* 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)
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
-};
+ 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 = (char *) *base - idx;
+
+ return PS_OK;
+}
+\f
+
+void _initialize_m68k_linux_nat (void);
void
-_initialize_m68k_linux_nat ()
+_initialize_m68k_linux_nat (void)
{
- add_core_fns (&linux_elf_core_fns);
+ struct target_ops *t;
+
+ /* Fill in the generic GNU/Linux methods. */
+ t = linux_target ();
+
+ /* Add our register access methods. */
+ t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
+ t->to_store_registers = m68k_linux_store_inferior_registers;
+
+ /* Register the target. */
+ linux_nat_add_target (t);
}
projects / external / binutils.git / blobdiff