-/* Native-dependent code for Linux/x86.
- Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
+/* Native-dependent code for GNU/Linux i386.
+
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+ 2009, 2010 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 "i386-nat.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
-
+#include "regset.h"
+#include "target.h"
+#include "linux-nat.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+#include "elf/common.h"
+#include <sys/uio.h>
#include <sys/ptrace.h>
#include <sys/user.h>
#include <sys/procfs.h>
#include <sys/reg.h>
#endif
+#ifndef ORIG_EAX
+#define ORIG_EAX -1
+#endif
+
+#ifdef HAVE_SYS_DEBUGREG_H
+#include <sys/debugreg.h>
+#endif
+
+#ifndef DR_FIRSTADDR
+#define DR_FIRSTADDR 0
+#endif
+
+#ifndef DR_LASTADDR
+#define DR_LASTADDR 3
+#endif
+
+#ifndef DR_STATUS
+#define DR_STATUS 6
+#endif
+
+#ifndef DR_CONTROL
+#define DR_CONTROL 7
+#endif
+
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
-/* Prototypes for i387_supply_fsave etc. */
-#include "i387-nat.h"
+#include "i387-tdep.h"
+#include "i386-tdep.h"
+#include "i386-linux-tdep.h"
-/* Prototypes for local functions. */
-static void dummy_sse_values (void);
+/* Defines ps_err_e, struct ps_prochandle. */
+#include "gdb_proc_service.h"
-/* On 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_pid will contain the main process ID and the
- individual thread (process) ID mashed together. These macros are
- used to separate them out. These definitions should be overridden
- if thread support is included. */
+#include "i386-xstate.h"
-#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */
-#define PIDGET(PID) PID
-#define TIDGET(PID) 0
+#ifndef PTRACE_GETREGSET
+#define PTRACE_GETREGSET 0x4204
#endif
+
+#ifndef PTRACE_SETREGSET
+#define PTRACE_SETREGSET 0x4205
+#endif
+
+/* Does the current host support PTRACE_GETREGSET? */
+static int have_ptrace_getregset = -1;
\f
-/* The register sets used in Linux ELF core-dumps are identical to the
- register sets in `struct user' that is used for a.out core-dumps,
- and is also used by `ptrace'. The corresponding types are
- `elf_gregset_t' for the general-purpose registers (with
+/* The register sets used in GNU/Linux ELF core-dumps are identical to
+ the register sets in `struct user' that is used for a.out
+ core-dumps, and is also used by `ptrace'. The corresponding types
+ are `elf_gregset_t' for the general-purpose registers (with
`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
for the floating-point registers.
those names are now used for the register sets used in the
`mcontext_t' type, and have a different size and layout. */
-/* Mapping between the general-purpose registers in `struct user'
- format and GDB's register array layout. */
-static int regmap[] =
-{
- EAX, ECX, EDX, EBX,
- UESP, EBP, ESI, EDI,
- EIP, EFL, CS, SS,
- DS, ES, FS, GS
-};
-
/* Which ptrace request retrieves which registers?
These apply to the corresponding SET requests as well. */
+
#define GETREGS_SUPPLIES(regno) \
- (0 <= (regno) && (regno) <= 15)
-#define GETFPREGS_SUPPLIES(regno) \
- (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM)
+ ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM)
+
#define GETFPXREGS_SUPPLIES(regno) \
- (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
+ (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS)
+
+#define GETXSTATEREGS_SUPPLIES(regno) \
+ (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS)
/* Does the current host support the GETREGS request? */
int have_ptrace_getregs =
for this to be a simple variable. */
int have_ptrace_getfpxregs =
#ifdef HAVE_PTRACE_GETFPXREGS
- 1
+ -1
#else
0
#endif
;
\f
-/* Fetching registers directly from the U area, one at a time. */
-
-/* FIXME: kettenis/2000-03-05: This duplicates code from `inptrace.c'.
- The problem is that we define FETCH_INFERIOR_REGISTERS since we
- want to use our own versions of {fetch,store}_inferior_registers
- that use the GETREGS request. This means that the code in
- `infptrace.c' is #ifdef'd out. But we need to fall back on that
- code when GDB is running on top of a kernel that doesn't support
- the GETREGS request. I want to avoid changing `infptrace.c' right
- now. */
-
-#ifndef PT_READ_U
-#define PT_READ_U PTRACE_PEEKUSR
-#endif
-#ifndef PT_WRITE_U
-#define PT_WRITE_U PTRACE_POKEUSR
-#endif
-
-/* Default the type of the ptrace transfer to int. */
-#ifndef PTRACE_XFER_TYPE
-#define PTRACE_XFER_TYPE int
-#endif
-
-/* Registers we shouldn't try to fetch. */
-#define OLD_CANNOT_FETCH_REGISTER(regno) ((regno) >= NUM_GREGS)
+/* Accessing registers through the U area, one at a time. */
/* Fetch one register. */
static void
-fetch_register (int regno)
+fetch_register (struct regcache *regcache, int regno)
{
- /* This isn't really an address. But ptrace thinks of it as one. */
- CORE_ADDR regaddr;
- char mess[128]; /* For messages */
- register int i;
- unsigned int offset; /* Offset of registers within the u area. */
- char buf[MAX_REGISTER_RAW_SIZE];
int tid;
+ int val;
- if (OLD_CANNOT_FETCH_REGISTER (regno))
+ gdb_assert (!have_ptrace_getregs);
+ if (i386_linux_gregset_reg_offset[regno] == -1)
{
- memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
- supply_register (regno, buf);
+ regcache_raw_supply (regcache, regno, NULL);
return;
}
- /* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
- offset = U_REGS_OFFSET;
+ errno = 0;
+ val = ptrace (PTRACE_PEEKUSER, tid,
+ i386_linux_gregset_reg_offset[regno], 0);
+ if (errno != 0)
+ error (_("Couldn't read register %s (#%d): %s."),
+ gdbarch_register_name (get_regcache_arch (regcache), regno),
+ regno, safe_strerror (errno));
- regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
- (PTRACE_ARG3_TYPE) regaddr, 0);
- regaddr += sizeof (PTRACE_XFER_TYPE);
- if (errno != 0)
- {
- sprintf (mess, "reading register %s (#%d)",
- REGISTER_NAME (regno), regno);
- perror_with_name (mess);
- }
- }
- supply_register (regno, buf);
+ regcache_raw_supply (regcache, regno, &val);
}
-/* 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). */
-
-void
-old_fetch_inferior_registers (int regno)
-{
- if (regno >= 0)
- {
- fetch_register (regno);
- }
- else
- {
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
- {
- fetch_register (regno);
- }
- }
-}
-
-/* Registers we shouldn't try to store. */
-#define OLD_CANNOT_STORE_REGISTER(regno) ((regno) >= NUM_GREGS)
-
/* Store one register. */
static void
-store_register (int regno)
+store_register (const struct regcache *regcache, int regno)
{
- /* This isn't really an address. But ptrace thinks of it as one. */
- CORE_ADDR regaddr;
- char mess[128]; /* For messages */
- register int i;
- unsigned int offset; /* Offset of registers within the u area. */
int tid;
-
- if (OLD_CANNOT_STORE_REGISTER (regno))
- {
- return;
- }
-
- /* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
-
- offset = U_REGS_OFFSET;
-
- regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
- *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]);
- regaddr += sizeof (PTRACE_XFER_TYPE);
- if (errno != 0)
- {
- sprintf (mess, "writing register %s (#%d)",
- REGISTER_NAME (regno), regno);
- perror_with_name (mess);
- }
- }
-}
-
-/* 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). */
-
-void
-old_store_inferior_registers (int regno)
-{
- if (regno >= 0)
- {
- store_register (regno);
- }
- else
- {
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
- {
- store_register (regno);
- }
- }
+ int val;
+
+ gdb_assert (!have_ptrace_getregs);
+ if (i386_linux_gregset_reg_offset[regno] == -1)
+ return;
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+ errno = 0;
+ regcache_raw_collect (regcache, regno, &val);
+ ptrace (PTRACE_POKEUSER, tid,
+ i386_linux_gregset_reg_offset[regno], val);
+ if (errno != 0)
+ error (_("Couldn't write register %s (#%d): %s."),
+ gdbarch_register_name (get_regcache_arch (regcache), regno),
+ regno, safe_strerror (errno));
}
\f
in *GREGSETP. */
void
-supply_gregset (elf_gregset_t *gregsetp)
+supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ const gdb_byte *regp = (const gdb_byte *) gregsetp;
int i;
- for (i = 0; i < NUM_GREGS; i++)
- supply_register (i, (char *) (regp + regmap[i]));
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ regcache_raw_supply (regcache, i,
+ regp + i386_linux_gregset_reg_offset[i]);
+
+ if (I386_LINUX_ORIG_EAX_REGNUM
+ < gdbarch_num_regs (get_regcache_arch (regcache)))
+ regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM,
+ regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
}
/* Fill register REGNO (if it is a general-purpose register) in
do this for all registers. */
void
-fill_gregset (elf_gregset_t *gregsetp, int regno)
+fill_gregset (const struct regcache *regcache,
+ elf_gregset_t *gregsetp, int regno)
{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ gdb_byte *regp = (gdb_byte *) gregsetp;
int i;
- for (i = 0; i < NUM_GREGS; i++)
- if ((regno == -1 || regno == i))
- *(regp + regmap[i]) = *(elf_greg_t *) ®isters[REGISTER_BYTE (i)];
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (regcache, i,
+ regp + i386_linux_gregset_reg_offset[i]);
+
+ if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
+ && I386_LINUX_ORIG_EAX_REGNUM
+ < gdbarch_num_regs (get_regcache_arch (regcache)))
+ regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM,
+ regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
}
#ifdef HAVE_PTRACE_GETREGS
store their values in GDB's register array. */
static void
-fetch_regs (int tid)
+fetch_regs (struct regcache *regcache, int tid)
{
elf_gregset_t regs;
+ elf_gregset_t *regs_p = ®s;
if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
{
return;
}
- perror_with_name ("Couldn't get registers");
+ perror_with_name (_("Couldn't get registers"));
}
- supply_gregset (®s);
+ supply_gregset (regcache, (const elf_gregset_t *) regs_p);
}
/* Store all valid general-purpose registers in GDB's register array
into the process/thread specified by TID. */
static void
-store_regs (int tid, int regno)
+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");
+ perror_with_name (_("Couldn't get registers"));
- fill_gregset (®s, regno);
+ fill_gregset (regcache, ®s, regno);
if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name ("Couldn't write registers");
+ perror_with_name (_("Couldn't write registers"));
}
#else
-static void fetch_regs (int tid) {}
-static void store_regs (int tid, int regno) {}
+static void fetch_regs (struct regcache *regcache, int tid) {}
+static void store_regs (const struct regcache *regcache, int tid, int regno) {}
#endif
\f
*FPREGSETP. */
void
-supply_fpregset (elf_fpregset_t *fpregsetp)
+supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
{
- i387_supply_fsave ((char *) fpregsetp);
- dummy_sse_values ();
+ i387_supply_fsave (regcache, -1, fpregsetp);
}
/* Fill register REGNO (if it is a floating-point register) in
do this for all registers. */
void
-fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
+fill_fpregset (const struct regcache *regcache,
+ elf_fpregset_t *fpregsetp, int regno)
{
- i387_fill_fsave ((char *) fpregsetp, regno);
+ i387_collect_fsave (regcache, regno, fpregsetp);
}
#ifdef HAVE_PTRACE_GETREGS
thier values in GDB's register array. */
static void
-fetch_fpregs (int tid)
+fetch_fpregs (struct regcache *regcache, int tid)
{
elf_fpregset_t fpregs;
if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
- perror_with_name ("Couldn't get floating point status");
+ perror_with_name (_("Couldn't get floating point status"));
- supply_fpregset (&fpregs);
+ 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 (int tid, int regno)
+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");
+ perror_with_name (_("Couldn't get floating point status"));
- fill_fpregset (&fpregs, regno);
+ fill_fpregset (regcache, &fpregs, regno);
if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
- perror_with_name ("Couldn't write floating point status");
+ perror_with_name (_("Couldn't write floating point status"));
}
#else
-static void fetch_fpregs (int tid) {}
-static void store_fpregs (int tid, int regno) {}
+static void fetch_fpregs (struct regcache *regcache, int tid) {}
+static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
#endif
\f
/* Transfering floating-point and SSE registers to and from GDB. */
+/* Fetch all registers covered by the PTRACE_GETREGSET request from
+ process/thread TID and store their values in GDB's register array.
+ Return non-zero if successful, zero otherwise. */
+
+static int
+fetch_xstateregs (struct regcache *regcache, int tid)
+{
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ if (!have_ptrace_getregset)
+ return 0;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof(xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ &iov) < 0)
+ perror_with_name (_("Couldn't read extended state status"));
+
+ i387_supply_xsave (regcache, -1, xstateregs);
+ return 1;
+}
+
+/* Store all valid registers in GDB's register array covered by the
+ PTRACE_SETREGSET request into the process/thread specified by TID.
+ Return non-zero if successful, zero otherwise. */
+
+static int
+store_xstateregs (const struct regcache *regcache, int tid, int regno)
+{
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ if (!have_ptrace_getregset)
+ return 0;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof(xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ &iov) < 0)
+ perror_with_name (_("Couldn't read extended state status"));
+
+ i387_collect_xsave (regcache, regno, xstateregs, 0);
+
+ if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ (int) &iov) < 0)
+ perror_with_name (_("Couldn't write extended state status"));
+
+ return 1;
+}
+
#ifdef HAVE_PTRACE_GETFPXREGS
/* Fill GDB's register array with the floating-point and SSE register
values in *FPXREGSETP. */
-static void
-supply_fpxregset (elf_fpxregset_t *fpxregsetp)
+void
+supply_fpxregset (struct regcache *regcache,
+ const elf_fpxregset_t *fpxregsetp)
{
- i387_supply_fxsave ((char *) fpxregsetp);
+ i387_supply_fxsave (regcache, -1, fpxregsetp);
}
/* Fill register REGNO (if it is a floating-point or SSE register) in
*FPXREGSETP with the value in GDB's register array. If REGNO is
-1, do this for all registers. */
-static void
-fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno)
+void
+fill_fpxregset (const struct regcache *regcache,
+ elf_fpxregset_t *fpxregsetp, int regno)
{
- i387_fill_fxsave ((char *) fpxregsetp, regno);
+ i387_collect_fxsave (regcache, regno, fpxregsetp);
}
/* Fetch all registers covered by the PTRACE_GETFPXREGS request from
Return non-zero if successful, zero otherwise. */
static int
-fetch_fpxregs (int tid)
+fetch_fpxregs (struct regcache *regcache, int tid)
{
elf_fpxregset_t fpxregs;
return 0;
}
- perror_with_name ("Couldn't read floating-point and SSE registers");
+ perror_with_name (_("Couldn't read floating-point and SSE registers"));
}
- supply_fpxregset (&fpxregs);
+ supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs);
return 1;
}
Return non-zero if successful, zero otherwise. */
static int
-store_fpxregs (int tid, int regno)
+store_fpxregs (const struct regcache *regcache, int tid, int regno)
{
elf_fpxregset_t fpxregs;
return 0;
}
- perror_with_name ("Couldn't read floating-point and SSE registers");
+ perror_with_name (_("Couldn't read floating-point and SSE registers"));
}
- fill_fpxregset (&fpxregs, regno);
+ fill_fpxregset (regcache, &fpxregs, regno);
if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1)
- perror_with_name ("Couldn't write floating-point and SSE registers");
+ perror_with_name (_("Couldn't write floating-point and SSE registers"));
return 1;
}
-/* Fill the XMM registers in the register array with dummy values. For
- cases where we don't have access to the XMM registers. I think
- this is cleaner than printing a warning. For a cleaner solution,
- we should gdbarchify the i386 family. */
-
-static void
-dummy_sse_values (void)
-{
- /* C doesn't have a syntax for NaN's, so write it out as an array of
- longs. */
- static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff };
- static long mxcsr = 0x1f80;
- int reg;
-
- for (reg = 0; reg < 8; reg++)
- supply_register (XMM0_REGNUM + reg, (char *) dummy);
- supply_register (MXCSR_REGNUM, (char *) &mxcsr);
-}
-
#else
-static int fetch_fpxregs (int tid) { return 0; }
-static int store_fpxregs (int tid, int regno) { return 0; }
-static void dummy_sse_values (void) {}
+static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; }
+static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; }
#endif /* HAVE_PTRACE_GETFPXREGS */
\f
/* Transferring arbitrary registers between GDB and inferior. */
-/* Check if register REGNO in the child process is accessible.
- If we are accessing registers directly via the U area, only the
- general-purpose registers are available.
- All registers should be accessible if we have GETREGS support. */
-
-int
-cannot_fetch_register (int regno)
-{
- if (! have_ptrace_getregs)
- return OLD_CANNOT_FETCH_REGISTER (regno);
- return 0;
-}
-int
-cannot_store_register (int regno)
-{
- if (! have_ptrace_getregs)
- return OLD_CANNOT_STORE_REGISTER (regno);
- return 0;
-}
-
/* Fetch register REGNO from the child process. If REGNO is -1, do
this for all registers (including the floating point and SSE
registers). */
-void
-fetch_inferior_registers (int regno)
+static void
+i386_linux_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
int tid;
/* Use the old method of peeking around in `struct user' if the
GETREGS request isn't available. */
- if (! have_ptrace_getregs)
+ if (!have_ptrace_getregs)
{
- old_fetch_inferior_registers (regno);
+ int i;
+
+ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
+ if (regno == -1 || regno == i)
+ fetch_register (regcache, i);
+
return;
}
- /* Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* Not a threaded program. */
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (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
zero. */
if (regno == -1)
{
- fetch_regs (tid);
+ fetch_regs (regcache, tid);
/* The call above might reset `have_ptrace_getregs'. */
- if (! have_ptrace_getregs)
+ if (!have_ptrace_getregs)
{
- old_fetch_inferior_registers (-1);
+ i386_linux_fetch_inferior_registers (ops, regcache, regno);
return;
}
- if (fetch_fpxregs (tid))
+ if (fetch_xstateregs (regcache, tid))
+ return;
+ if (fetch_fpxregs (regcache, tid))
return;
- fetch_fpregs (tid);
+ fetch_fpregs (regcache, tid);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- fetch_regs (tid);
+ fetch_regs (regcache, tid);
return;
}
+ if (GETXSTATEREGS_SUPPLIES (regno))
+ {
+ if (fetch_xstateregs (regcache, tid))
+ return;
+ }
+
if (GETFPXREGS_SUPPLIES (regno))
{
- if (fetch_fpxregs (tid))
+ if (fetch_fpxregs (regcache, tid))
return;
/* Either our processor or our kernel doesn't support the SSE
more graceful to handle differences in the register set using
gdbarch. Until then, this will at least make things work
plausibly. */
- fetch_fpregs (tid);
+ fetch_fpregs (regcache, tid);
return;
}
internal_error (__FILE__, __LINE__,
- "Got request for bad register number %d.", regno);
+ _("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). */
-void
-store_inferior_registers (int regno)
+static void
+i386_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)
+ if (!have_ptrace_getregs)
{
- old_store_inferior_registers (regno);
+ int i;
+
+ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
+ if (regno == -1 || regno == i)
+ store_register (regcache, i);
+
return;
}
- /* Linux LWP ID's are process ID's. */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* Not a threaded program. */
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
/* Use the PTRACE_SETFPXREGS requests whenever possible, since it
transfers more registers in one system call. But remember that
store_fpxregs can fail, and return zero. */
if (regno == -1)
{
- store_regs (tid, regno);
- if (store_fpxregs (tid, regno))
+ store_regs (regcache, tid, regno);
+ if (store_xstateregs (regcache, tid, regno))
return;
- store_fpregs (tid, regno);
+ if (store_fpxregs (regcache, tid, regno))
+ return;
+ store_fpregs (regcache, tid, regno);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- store_regs (tid, regno);
+ store_regs (regcache, tid, regno);
return;
}
+ if (GETXSTATEREGS_SUPPLIES (regno))
+ {
+ if (store_xstateregs (regcache, tid, regno))
+ return;
+ }
+
if (GETFPXREGS_SUPPLIES (regno))
{
- if (store_fpxregs (tid, regno))
+ if (store_fpxregs (regcache, tid, regno))
return;
/* Either our processor or our kernel doesn't support the SSE
registers, so just write the FP registers in the traditional
way. */
- store_fpregs (tid, regno);
+ store_fpregs (regcache, tid, regno);
return;
}
internal_error (__FILE__, __LINE__,
- "Got request to store bad register number %d.", regno);
+ _("Got request to store bad register number %d."), regno);
}
\f
-/* Interpreting register set info found in core files. */
+/* Support for debug registers. */
-/* Provide registers to GDB from a core file.
+static unsigned long i386_linux_dr[DR_CONTROL + 1];
- (We can't use the generic version of this function in
- core-regset.c, because Linux has *three* different kinds of
- register set notes. core-regset.c would have to call
- supply_fpxregset, which most platforms don't have.)
+/* Get debug register REGNUM value from only the one LWP of PTID. */
- 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.
+static unsigned long
+i386_linux_dr_get (ptid_t ptid, int regnum)
+{
+ int tid;
+ unsigned long value;
+
+ tid = TIDGET (ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
+ ptrace call fails breaks debugging remote targets. The correct
+ way to fix this is to add the hardware breakpoint and watchpoint
+ stuff to the target vector. For now, just return zero if the
+ ptrace call fails. */
+ errno = 0;
+ value = ptrace (PTRACE_PEEKUSER, tid,
+ offsetof (struct user, u_debugreg[regnum]), 0);
+ if (errno != 0)
+#if 0
+ perror_with_name (_("Couldn't read debug register"));
+#else
+ return 0;
+#endif
+
+ return value;
+}
- 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
- 3 --- the extended floating-point register set, in elf_fpxregset_t format
+/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */
+
+static void
+i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
+{
+ int tid;
+
+ tid = TIDGET (ptid);
+ if (tid == 0)
+ tid = PIDGET (ptid);
+
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, tid,
+ offsetof (struct user, u_debugreg[regnum]), value);
+ if (errno != 0)
+ perror_with_name (_("Couldn't write debug register"));
+}
- REG_ADDR isn't used on Linux. */
+/* Set DR_CONTROL to ADDR in all LWPs of LWP_LIST. */
static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
- int which, CORE_ADDR reg_addr)
+i386_linux_dr_set_control (unsigned long control)
{
- elf_gregset_t gregset;
- elf_fpregset_t fpregset;
+ struct lwp_info *lp;
+ ptid_t ptid;
- switch (which)
+ i386_linux_dr[DR_CONTROL] = control;
+ ALL_LWPS (lp, ptid)
+ i386_linux_dr_set (ptid, DR_CONTROL, control);
+}
+
+/* Set address REGNUM (zero based) to ADDR in all LWPs of LWP_LIST. */
+
+static void
+i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+ struct lwp_info *lp;
+ ptid_t ptid;
+
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+ i386_linux_dr[DR_FIRSTADDR + regnum] = addr;
+ ALL_LWPS (lp, ptid)
+ i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
+}
+
+/* Set address REGNUM (zero based) to zero in all LWPs of LWP_LIST. */
+
+static void
+i386_linux_dr_reset_addr (int regnum)
+{
+ i386_linux_dr_set_addr (regnum, 0);
+}
+
+/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
+
+static unsigned long
+i386_linux_dr_get_status (void)
+{
+ return i386_linux_dr_get (inferior_ptid, DR_STATUS);
+}
+
+/* Unset MASK bits in DR_STATUS in all LWPs of LWP_LIST. */
+
+static void
+i386_linux_dr_unset_status (unsigned long mask)
+{
+ struct lwp_info *lp;
+ ptid_t ptid;
+
+ ALL_LWPS (lp, ptid)
{
- case 0:
- if (core_reg_size != sizeof (gregset))
- warning ("Wrong size gregset in core file.");
- else
- {
- memcpy (&gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
- }
- break;
+ unsigned long value;
+
+ value = i386_linux_dr_get (ptid, DR_STATUS);
+ value &= ~mask;
+ i386_linux_dr_set (ptid, DR_STATUS, value);
+ }
+}
- 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;
+static void
+i386_linux_new_thread (ptid_t ptid)
+{
+ int i;
-#ifdef HAVE_PTRACE_GETFPXREGS
- {
- elf_fpxregset_t fpxregset;
-
- case 3:
- if (core_reg_size != sizeof (fpxregset))
- warning ("Wrong size fpxregset in core file.");
- else
- {
- memcpy (&fpxregset, core_reg_sect, sizeof (fpxregset));
- supply_fpxregset (&fpxregset);
- }
- break;
- }
+ for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+ i386_linux_dr_set (ptid, i, i386_linux_dr[i]);
+
+ i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]);
+}
+\f
+
+/* Called by libthread_db. Returns a pointer to the thread local
+ storage (or its descriptor). */
+
+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+ lwpid_t lwpid, int idx, void **base)
+{
+ /* NOTE: cagney/2003-08-26: The definition of this buffer is found
+ in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x
+ 4 byte integers in size: `entry_number', `base_addr', `limit',
+ and a bunch of status bits.
+
+ The values returned by this ptrace call should be part of the
+ regcache buffer, and ps_get_thread_area should channel its
+ request through the regcache. That way remote targets could
+ provide the value using the remote protocol and not this direct
+ call.
+
+ Is this function needed? I'm guessing that the `base' is the
+ address of a a descriptor that libthread_db uses to find the
+ thread local address base that GDB needs. Perhaps that
+ descriptor is defined by the ABI. Anyway, given that
+ libthread_db calls this function without prompting (gdb
+ requesting tls base) I guess it needs info in there anyway. */
+ unsigned int desc[4];
+ gdb_assert (sizeof (int) == 4);
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
#endif
- 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;
- }
+ if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
+ (void *) idx, (unsigned long) &desc) < 0)
+ return PS_ERR;
+
+ *(int *)base = desc[1];
+ return PS_OK;
}
\f
-/* The instruction for a Linux system call is:
+/* The instruction for a GNU/Linux system call is:
int $0x80
or 0xcd 0x80. */
#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
/* The system call number is stored in the %eax register. */
-#define LINUX_SYSCALL_REGNUM 0 /* %eax */
+#define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM
/* We are specifically interested in the sigreturn and rt_sigreturn
system calls. */
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
-void
-child_resume (int pid, int step, enum target_signal signal)
+static void
+i386_linux_resume (struct target_ops *ops,
+ ptid_t ptid, int step, enum target_signal signal)
{
- int request = PTRACE_CONT;
+ int pid = PIDGET (ptid);
+
+ int request;
- if (pid == -1)
- /* Resume all threads. */
- /* I think this only gets used in the non-threaded case, where "resume
- all threads" and "resume inferior_pid" are the same. */
- pid = inferior_pid;
+ if (catch_syscall_enabled () > 0)
+ request = PTRACE_SYSCALL;
+ else
+ request = PTRACE_CONT;
if (step)
{
- CORE_ADDR pc = read_pc_pid (pid);
- unsigned char buf[LINUX_SYSCALL_LEN];
+ struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid));
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ ULONGEST pc;
+ gdb_byte buf[LINUX_SYSCALL_LEN];
request = PTRACE_SINGLESTEP;
+ regcache_cooked_read_unsigned (regcache,
+ gdbarch_pc_regnum (gdbarch), &pc);
+
/* Returning from a signal trampoline is done by calling a
special system call (sigreturn or rt_sigreturn, see
i386-linux-tdep.c for more information). This system call
that's about to be restored, and set the trace flag there. */
/* First check if PC is at a system call. */
- if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0
+ if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0
&& memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
{
- int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, pid);
+ ULONGEST syscall;
+ regcache_cooked_read_unsigned (regcache,
+ LINUX_SYSCALL_REGNUM, &syscall);
/* Then check the system call number. */
if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn)
{
- CORE_ADDR sp = read_register (SP_REGNUM);
- CORE_ADDR addr = sp;
+ ULONGEST sp, addr;
unsigned long int eflags;
-
+
+ regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp);
if (syscall == SYS_rt_sigreturn)
- addr = read_memory_integer (sp + 8, 4) + 20;
+ addr = read_memory_integer (sp + 8, 4, byte_order) + 20;
+ else
+ addr = sp;
/* Set the trace flag in the context that's about to be
restored. */
addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
- read_memory (addr, (char *) &eflags, 4);
+ read_memory (addr, (gdb_byte *) &eflags, 4);
eflags |= 0x0100;
- write_memory (addr, (char *) &eflags, 4);
+ write_memory (addr, (gdb_byte *) &eflags, 4);
}
}
}
if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
- perror_with_name ("ptrace");
+ perror_with_name (("ptrace"));
}
-\f
-/* Register that we are able to handle Linux ELF core file formats. */
+static void (*super_post_startup_inferior) (ptid_t ptid);
+
+static void
+i386_linux_child_post_startup_inferior (ptid_t ptid)
+{
+ i386_cleanup_dregs ();
+ super_post_startup_inferior (ptid);
+}
+
+/* Get Linux/x86 target description from running target. */
-static struct core_fns linux_elf_core_fns =
+static const struct target_desc *
+i386_linux_read_description (struct target_ops *ops)
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
-};
+ int tid;
+ static uint64_t xcr0;
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+#ifdef HAVE_PTRACE_GETFPXREGS
+ if (have_ptrace_getfpxregs == -1)
+ {
+ elf_fpxregset_t fpxregs;
+
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
+ {
+ have_ptrace_getfpxregs = 0;
+ have_ptrace_getregset = 0;
+ return tdesc_i386_mmx_linux;
+ }
+ }
+#endif
+
+ if (have_ptrace_getregset == -1)
+ {
+ uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+
+ /* Check if PTRACE_GETREGSET works. */
+ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ &iov) < 0)
+ have_ptrace_getregset = 0;
+ else
+ {
+ have_ptrace_getregset = 1;
+
+ /* Get XCR0 from XSAVE extended state. */
+ xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
+ / sizeof (long long))];
+ }
+ }
+
+ /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
+ if (have_ptrace_getregset
+ && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
+ return tdesc_i386_avx_linux;
+ else
+ return tdesc_i386_linux;
+}
void
_initialize_i386_linux_nat (void)
{
- add_core_fns (&linux_elf_core_fns);
+ struct target_ops *t;
+
+ /* Fill in the generic GNU/Linux methods. */
+ t = linux_target ();
+
+ i386_use_watchpoints (t);
+
+ i386_dr_low.set_control = i386_linux_dr_set_control;
+ i386_dr_low.set_addr = i386_linux_dr_set_addr;
+ i386_dr_low.reset_addr = i386_linux_dr_reset_addr;
+ i386_dr_low.get_status = i386_linux_dr_get_status;
+ i386_dr_low.unset_status = i386_linux_dr_unset_status;
+ i386_set_debug_register_length (4);
+
+ /* Override the default ptrace resume method. */
+ t->to_resume = i386_linux_resume;
+
+ /* Override the GNU/Linux inferior startup hook. */
+ super_post_startup_inferior = t->to_post_startup_inferior;
+ t->to_post_startup_inferior = i386_linux_child_post_startup_inferior;
+
+ /* Add our register access methods. */
+ t->to_fetch_registers = i386_linux_fetch_inferior_registers;
+ t->to_store_registers = i386_linux_store_inferior_registers;
+
+ t->to_read_description = i386_linux_read_description;
+
+ /* Register the target. */
+ linux_nat_add_target (t);
+ linux_nat_set_new_thread (t, i386_linux_new_thread);
}