/* Native-dependent code for GNU/Linux on MIPS processors.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
+#include "inferior.h"
#include "mips-tdep.h"
+#include "target.h"
+#include "regcache.h"
+#include "linux-nat.h"
+#include "mips-linux-tdep.h"
-/* Pseudo registers can not be read. ptrace does not provide a way to
- read (or set) PS_REGNUM, and there's no point in reading or setting
- MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR
- via ptrace(). */
+#include "gdb_proc_service.h"
+#include "gregset.h"
-int
-mips_linux_cannot_fetch_register (int regno)
+#include <sys/ptrace.h>
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+
+/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
+ we'll clear this and use PTRACE_PEEKUSER instead. */
+static int have_ptrace_regsets = 1;
+
+/* Saved function pointers to fetch and store a single register using
+ PTRACE_PEEKUSER and PTRACE_POKEUSER. */
+
+void (*super_fetch_registers) (struct regcache *, int);
+void (*super_store_registers) (struct regcache *, int);
+
+/* Map gdb internal register number to ptrace ``address''.
+ These ``addresses'' are normally defined in <asm/ptrace.h>.
+
+ ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
+ and there's no point in reading or setting MIPS_ZERO_REGNUM.
+ We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */
+
+static CORE_ADDR
+mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
+ CORE_ADDR regaddr;
+
+ if (regno < 0 || regno >= NUM_REGS)
+ error (_("Bogon register number %d."), regno);
+
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
- return 0;
- else if (regno >= mips_regnum (current_gdbarch)->fp0
- && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
- return 0;
- else if (regno == mips_regnum (current_gdbarch)->lo
- || regno == mips_regnum (current_gdbarch)->hi
- || regno == mips_regnum (current_gdbarch)->badvaddr
- || regno == mips_regnum (current_gdbarch)->cause
- || regno == mips_regnum (current_gdbarch)->pc
- || regno == mips_regnum (current_gdbarch)->fp_control_status
- || regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
- return 0;
+ regaddr = regno;
+ else if ((regno >= mips_regnum (gdbarch)->fp0)
+ && (regno < mips_regnum (gdbarch)->fp0 + 32))
+ regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
+ else if (regno == mips_regnum (gdbarch)->pc)
+ regaddr = PC;
+ else if (regno == mips_regnum (gdbarch)->cause)
+ regaddr = store? (CORE_ADDR) -1 : CAUSE;
+ else if (regno == mips_regnum (gdbarch)->badvaddr)
+ regaddr = store? (CORE_ADDR) -1 : BADVADDR;
+ else if (regno == mips_regnum (gdbarch)->lo)
+ regaddr = MMLO;
+ else if (regno == mips_regnum (gdbarch)->hi)
+ regaddr = MMHI;
+ else if (regno == mips_regnum (gdbarch)->fp_control_status)
+ regaddr = FPC_CSR;
+ else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
+ regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
else
- return 1;
+ regaddr = (CORE_ADDR) -1;
+
+ return regaddr;
}
-int
-mips_linux_cannot_store_register (int regno)
+static CORE_ADDR
+mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
+ CORE_ADDR regaddr;
+
+ if (regno < 0 || regno >= NUM_REGS)
+ error (_("Bogon register number %d."), regno);
+
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
- return 0;
- else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
- return 0;
- else if (regno == mips_regnum (current_gdbarch)->lo
- || regno == mips_regnum (current_gdbarch)->hi
- || regno == mips_regnum (current_gdbarch)->pc
- || regno == mips_regnum (current_gdbarch)->fp_control_status)
- return 0;
+ regaddr = regno;
+ else if ((regno >= mips_regnum (gdbarch)->fp0)
+ && (regno < mips_regnum (gdbarch)->fp0 + 32))
+ regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
+ else if (regno == mips_regnum (gdbarch)->pc)
+ regaddr = MIPS64_PC;
+ else if (regno == mips_regnum (gdbarch)->cause)
+ regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
+ else if (regno == mips_regnum (gdbarch)->badvaddr)
+ regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
+ else if (regno == mips_regnum (gdbarch)->lo)
+ regaddr = MIPS64_MMLO;
+ else if (regno == mips_regnum (gdbarch)->hi)
+ regaddr = MIPS64_MMHI;
+ else if (regno == mips_regnum (gdbarch)->fp_control_status)
+ regaddr = MIPS64_FPC_CSR;
+ else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
+ regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
+ else
+ regaddr = (CORE_ADDR) -1;
+
+ return regaddr;
+}
+
+/* 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;
+}
+
+/* Wrapper functions. These are only used by libthread_db. */
+
+void
+supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
+{
+ if (mips_isa_regsize (current_gdbarch) == 4)
+ mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
+ else
+ mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
+}
+
+void
+fill_gregset (const struct regcache *regcache,
+ gdb_gregset_t *gregsetp, int regno)
+{
+ if (mips_isa_regsize (current_gdbarch) == 4)
+ mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
+ else
+ mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
+}
+
+void
+supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
+{
+ if (mips_isa_regsize (current_gdbarch) == 4)
+ mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
+ else
+ mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
+}
+
+void
+fill_fpregset (const struct regcache *regcache,
+ gdb_fpregset_t *fpregsetp, int regno)
+{
+ if (mips_isa_regsize (current_gdbarch) == 4)
+ mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
else
- return 1;
+ mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
+}
+
+
+/* Fetch REGNO (or all registers if REGNO == -1) from the target
+ using PTRACE_GETREGS et al. */
+
+static void
+mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
+{
+ int is_fp;
+ int tid;
+
+ if (regno >= mips_regnum (current_gdbarch)->fp0
+ && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+ is_fp = 1;
+ else
+ is_fp = 0;
+
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid);
+
+ if (regno == -1 || !is_fp)
+ {
+ mips64_elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_regsets = 0;
+ return;
+ }
+ perror_with_name (_("Couldn't get registers"));
+ }
+
+ mips64_supply_gregset (regcache,
+ (const mips64_elf_gregset_t *) ®s);
+ }
+
+ if (regno == -1 || is_fp)
+ {
+ mips64_elf_fpregset_t fp_regs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_regsets = 0;
+ return;
+ }
+ perror_with_name (_("Couldn't get FP registers"));
+ }
+
+ mips64_supply_fpregset (regcache,
+ (const mips64_elf_fpregset_t *) &fp_regs);
+ }
+}
+
+/* Store REGNO (or all registers if REGNO == -1) to the target
+ using PTRACE_SETREGS et al. */
+
+static void
+mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
+{
+ int is_fp;
+ int tid;
+
+ if (regno >= mips_regnum (current_gdbarch)->fp0
+ && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+ is_fp = 1;
+ else
+ is_fp = 0;
+
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid);
+
+ if (regno == -1 || !is_fp)
+ {
+ mips64_elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ mips64_fill_gregset (regcache, ®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't set registers"));
+ }
+
+ if (regno == -1 || is_fp)
+ {
+ mips64_elf_fpregset_t fp_regs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ perror_with_name (_("Couldn't get FP registers"));
+
+ mips64_fill_fpregset (regcache, &fp_regs, regno);
+
+ if (ptrace (PTRACE_SETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ perror_with_name (_("Couldn't set FP registers"));
+ }
+}
+
+/* Fetch REGNO (or all registers if REGNO == -1) from the target
+ using any working method. */
+
+static void
+mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
+{
+ /* Unless we already know that PTRACE_GETREGS does not work, try it. */
+ if (have_ptrace_regsets)
+ mips64_linux_regsets_fetch_registers (regcache, regnum);
+
+ /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
+ back to PTRACE_PEEKUSER. */
+ if (!have_ptrace_regsets)
+ super_fetch_registers (regcache, regnum);
+}
+
+/* Store REGNO (or all registers if REGNO == -1) to the target
+ using any working method. */
+
+static void
+mips64_linux_store_registers (struct regcache *regcache, int regnum)
+{
+ /* Unless we already know that PTRACE_GETREGS does not work, try it. */
+ if (have_ptrace_regsets)
+ mips64_linux_regsets_store_registers (regcache, regnum);
+
+ /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
+ back to PTRACE_PEEKUSER. */
+ if (!have_ptrace_regsets)
+ super_store_registers (regcache, regnum);
+}
+
+/* Return the address in the core dump or inferior of register
+ REGNO. */
+
+static CORE_ADDR
+mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
+{
+ if (mips_abi_regsize (gdbarch) == 8)
+ return mips64_linux_register_addr (gdbarch, regno, store_p);
+ else
+ return mips_linux_register_addr (gdbarch, regno, store_p);
+}
+
+void _initialize_mips_linux_nat (void);
+
+void
+_initialize_mips_linux_nat (void)
+{
+ struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
+
+ super_fetch_registers = t->to_fetch_registers;
+ super_store_registers = t->to_store_registers;
+
+ t->to_fetch_registers = mips64_linux_fetch_registers;
+ t->to_store_registers = mips64_linux_store_registers;
+
+ linux_nat_add_target (t);
}
projects / deliverable / binutils-gdb.git / blobdiff