-/* Native-dependent code for Linux running on i386's, for GDB.
+/* Native-dependent code for GNU/Linux i386.
-This file is part of GDB.
+ Copyright 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
-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 file is part of GDB.
-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.
+ 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.
-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. */
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
+#include "regcache.h"
+#include "linux-nat.h"
-/* For i386_linux_skip_solib_resolver */
-#include "symtab.h"
-#include "frame.h"
-#include "symfile.h"
-#include "objfiles.h"
-
+#include "gdb_assert.h"
+#include "gdb_string.h"
#include <sys/ptrace.h>
#include <sys/user.h>
#include <sys/procfs.h>
#include <sys/reg.h>
#endif
-/*
- * Some systems (Linux) may have threads 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. The definitions may be overridden in tm.h
- */
-
-#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */
-#define PIDGET(PID) PID
-#define TIDGET(PID) 0
+#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
-/* This is a duplicate of the table in i386-xdep.c. */
+#ifndef DR_CONTROL
+#define DR_CONTROL 7
+#endif
+
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
+/* Prototypes for i387_supply_fsave etc. */
+#include "i387-tdep.h"
+
+/* Defines for XMM0_REGNUM etc. */
+#include "i386-tdep.h"
+/* Defines I386_LINUX_ORIG_EAX_REGNUM. */
+#include "i386-linux-tdep.h"
+
+/* Defines ps_err_e, struct ps_prochandle. */
+#include "gdb_proc_service.h"
+
+/* Prototypes for local functions. */
+static void dummy_sse_values (void);
+\f
+
+/* 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 types used to be available under the names `gregset_t' and
+ `fpregset_t' too, and this file used those names in the past. But
+ 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,
+ -1, -1, -1, -1, /* st0, st1, st2, st3 */
+ -1, -1, -1, -1, /* st4, st5, st6, st7 */
+ -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */
+ -1, -1, -1, -1, /* fioff, foseg, fooff, fop */
+ -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */
+ -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */
+ -1, /* mxcsr */
+ ORIG_EAX
};
-
/* Which ptrace request retrieves which registers?
These apply to the corresponding SET requests as well. */
+
#define GETREGS_SUPPLIES(regno) \
- (0 <= (regno) && (regno) <= 15)
+ ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM)
+
#define GETFPREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM)
-#define GETXFPREGS_SUPPLIES(regno) \
+
+#define GETFPXREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
-/* Does the current host support the GETXFPREGS request? The header
+/* Does the current host support the GETREGS request? */
+int have_ptrace_getregs =
+#ifdef HAVE_PTRACE_GETREGS
+ 1
+#else
+ 0
+#endif
+;
+
+/* Does the current host support the GETFPXREGS request? The header
file may or may not define it, and even if it is defined, the
kernel will return EIO if it's running on a pre-SSE processor.
- PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own
- Linux kernel patch for SSE support. That patch may or may not
- actually make it into the official distribution. If you find that
- years have gone by since this stuff was added, and Linux isn't
- using PTRACE_GETXFPREGS, that means that our patch didn't make it,
- and you can delete this, and the related code.
-
My instinct is to attach this to some architecture- or
target-specific data structure, but really, a particular GDB
process can only run on top of one kernel at a time. So it's okay
for this to be a simple variable. */
-int have_ptrace_getxfpregs =
-#ifdef HAVE_PTRACE_GETXFPREGS
+int have_ptrace_getfpxregs =
+#ifdef HAVE_PTRACE_GETFPXREGS
1
#else
0
#endif
;
+\f
+
+/* Support for the user struct. */
+
+/* Return the address of register REGNUM. BLOCKEND is the value of
+ u.u_ar0, which should point to the registers. */
+CORE_ADDR
+register_u_addr (CORE_ADDR blockend, int regnum)
+{
+ return (blockend + 4 * regmap[regnum]);
+}
+
+/* Return the size of the user struct. */
+int
+kernel_u_size (void)
+{
+ return (sizeof (struct user));
+}
\f
-/* Transfering the general registers between GDB, inferiors and core files. */
-/* Given a pointer to a general register set in struct user format
- (gregset_t *), unpack the register contents and supply them as
- gdb's idea of the current register values. */
-void
-supply_gregset (gregsetp)
- gregset_t *gregsetp;
+/* Accessing registers through the U area, one at a time. */
+
+/* Fetch one register. */
+
+static void
+fetch_register (int regno)
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ int tid;
+ int val;
- for (regi = 0; regi < NUM_GREGS; regi++)
+ gdb_assert (!have_ptrace_getregs);
+ if (cannot_fetch_register (regno))
{
- supply_register (regi, (char *) (regp + regmap[regi]));
+ regcache_raw_supply (current_regcache, regno, NULL);
+ 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;
+ val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0);
+ if (errno != 0)
+ error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno),
+ regno, safe_strerror (errno));
+
+ regcache_raw_supply (current_regcache, regno, &val);
+}
+
+/* Store one register. */
+
+static void
+store_register (int regno)
+{
+ int tid;
+ int val;
+
+ gdb_assert (!have_ptrace_getregs);
+ if (cannot_store_register (regno))
+ 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 (current_regcache, regno, &val);
+ ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val);
+ if (errno != 0)
+ error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regno),
+ regno, safe_strerror (errno));
}
+\f
+/* Transfering the general-purpose registers between GDB, inferiors
+ and core files. */
+
+/* Fill GDB's register array with the general-purpose register values
+ in *GREGSETP. */
-/* Fill in a gregset_t object with selected data from a gdb-format
- register file.
- - GREGSETP points to the gregset_t object to be filled.
- - GDB_REGS points to the GDB-style register file providing the data.
- - VALID is an array indicating which registers in GDB_REGS are
- valid; the parts of *GREGSETP that would hold registers marked
- invalid in GDB_REGS are left unchanged. If VALID is zero, all
- registers are assumed to be valid. */
void
-convert_to_gregset (gregset_t *gregsetp,
- char *gdb_regs,
- signed char *valid)
+supply_gregset (elf_gregset_t *gregsetp)
{
- int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int i;
- for (regi = 0; regi < NUM_GREGS; regi++)
- if (! valid || valid[regi])
- *(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ regcache_raw_supply (current_regcache, i, regp + regmap[i]);
+
+ if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS)
+ regcache_raw_supply (current_regcache, I386_LINUX_ORIG_EAX_REGNUM,
+ regp + ORIG_EAX);
}
+/* 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. */
-/* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all
- of them. */
void
-fill_gregset (gregset_t *gregsetp,
- int regno)
+fill_gregset (elf_gregset_t *gregsetp, int regno)
{
- if (regno == -1)
- convert_to_gregset (gregsetp, registers, 0);
- else if (regno >= 0 && regno < NUM_GREGS)
- {
- signed char valid[NUM_GREGS];
- memset (valid, 0, sizeof (valid));
- valid[regno] = 1;
- convert_to_gregset (gregsetp, registers, valid);
- }
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int i;
+
+ for (i = 0; i < I386_NUM_GREGS; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (current_regcache, i, regp + regmap[i]);
+
+ if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
+ && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS)
+ regcache_raw_collect (current_regcache, I386_LINUX_ORIG_EAX_REGNUM,
+ regp + ORIG_EAX);
}
+#ifdef HAVE_PTRACE_GETREGS
+
+/* Fetch all general-purpose registers from process/thread TID and
+ store their values in GDB's register array. */
-/* Read the general registers from the process, and store them
- in registers[]. */
static void
fetch_regs (int tid)
{
- int ret, regno;
- gregset_t buf;
+ elf_gregset_t regs;
- ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
- if (ret < 0)
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
{
- warning ("Couldn't get registers");
- return;
+ if (errno == EIO)
+ {
+ /* The kernel we're running on doesn't support the GETREGS
+ request. Reset `have_ptrace_getregs'. */
+ have_ptrace_getregs = 0;
+ return;
+ }
+
+ perror_with_name ("Couldn't get registers");
}
- supply_gregset (&buf);
+ supply_gregset (®s);
}
+/* Store all valid general-purpose registers in GDB's register array
+ into the process/thread specified by TID. */
-/* Set the inferior's general registers to the values in registers[]
- --- but only those registers marked as valid. */
static void
-store_regs (int tid)
+store_regs (int tid, int regno)
{
- int ret, regno;
- gregset_t buf;
-
- ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
- if (ret < 0)
- {
- warning ("Couldn't get registers");
- return;
- }
+ elf_gregset_t regs;
- convert_to_gregset (&buf, registers, register_valid);
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name ("Couldn't get registers");
- ret = ptrace (PTRACE_SETREGS, tid, 0, (int)buf);
- if (ret < 0)
- {
- warning ("Couldn't write registers");
- return;
- }
+ fill_gregset (®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name ("Couldn't write registers");
}
+#else
+
+static void fetch_regs (int tid) {}
+static void store_regs (int tid, int regno) {}
+#endif
\f
-/* Transfering floating-point registers between GDB, inferiors and cores. */
-/* What is the address of st(N) within the fpregset_t structure F? */
-#define FPREGSET_T_FPREG_ADDR(f, n) \
- ((char *) &(f)->st_space + (n) * 10)
+/* Transfering floating-point registers between GDB, inferiors and cores. */
-/* Fill GDB's register file with the floating-point register values in
+/* Fill GDB's register array with the floating-point register values in
*FPREGSETP. */
+
void
-supply_fpregset (fpregset_t *fpregsetp)
+supply_fpregset (elf_fpregset_t *fpregsetp)
{
- int i;
-
- /* Supply the floating-point registers. */
- for (i = 0; i < 8; i++)
- supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_ADDR (fpregsetp, i));
-
- supply_register (FCTRL_REGNUM, (char *) &fpregsetp->cwd);
- supply_register (FSTAT_REGNUM, (char *) &fpregsetp->swd);
- supply_register (FTAG_REGNUM, (char *) &fpregsetp->twd);
- supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip);
- supply_register (FDS_REGNUM, (char *) &fpregsetp->fos);
- supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo);
-
- /* Extract the code segment and opcode from the "fcs" member. */
- {
- long l;
-
- l = fpregsetp->fcs & 0xffff;
- supply_register (FCS_REGNUM, (char *) &l);
-
- l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
- supply_register (FOP_REGNUM, (char *) &l);
- }
+ i387_supply_fsave (current_regcache, -1, fpregsetp);
+ dummy_sse_values ();
}
+/* 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. */
-/* Fill in an fpregset_t structure with selected data from a
- gdb-format register file.
- - FPREGSETP points to the structure to be filled.
- - GDB_REGS points to the GDB-style register file providing the data.
- - VALID is an array indicating which registers in GDB_REGS are
- valid; the parts of *FPREGSETP that would hold registers marked
- invalid in GDB_REGS are left unchanged. If VALID is zero, all
- registers are assumed to be valid. */
void
-convert_to_fpregset (fpregset_t *fpregsetp,
- char *gdb_regs,
- signed char *valid)
+fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
{
- int i;
-
- /* Fill in the floating-point registers. */
- for (i = 0; i < 8; i++)
- if (!valid || valid[i])
- memcpy (FPREGSET_T_FPREG_ADDR (fpregsetp, i),
- ®isters[REGISTER_BYTE (FP0_REGNUM + i)],
- REGISTER_RAW_SIZE(FP0_REGNUM + i));
-
-#define fill(MEMBER, REGNO) \
- if (! valid || valid[(REGNO)]) \
- memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
- sizeof (fpregsetp->MEMBER))
-
- fill (cwd, FCTRL_REGNUM);
- fill (swd, FSTAT_REGNUM);
- fill (twd, FTAG_REGNUM);
- fill (fip, FCOFF_REGNUM);
- fill (foo, FDOFF_REGNUM);
- fill (fos, FDS_REGNUM);
-
-#undef fill
-
- if (! valid || valid[FCS_REGNUM])
- fpregsetp->fcs
- = ((fpregsetp->fcs & ~0xffff)
- | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
-
- if (! valid || valid[FOP_REGNUM])
- fpregsetp->fcs
- = ((fpregsetp->fcs & 0xffff)
- | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
- << 16));
+ i387_fill_fsave ((char *) fpregsetp, regno);
}
+#ifdef HAVE_PTRACE_GETREGS
-/* Given a pointer to a floating point register set in (fpregset_t *)
- format, update all of the registers from gdb's idea of the current
- floating point register set. */
+/* Fetch all floating-point registers from process/thread TID and store
+ thier values in GDB's register array. */
-void
-fill_fpregset (fpregset_t *fpregsetp,
- int regno)
-{
- convert_to_fpregset (fpregsetp, registers, 0);
-}
-
-
-/* Get the whole floating point state of the process and store the
- floating point stack into registers[]. */
static void
fetch_fpregs (int tid)
{
- int ret, regno;
- fpregset_t buf;
+ elf_fpregset_t fpregs;
- ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf);
- if (ret < 0)
- {
- warning ("Couldn't get floating point status");
- return;
- }
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't get floating point status");
- /* ptrace fills an fpregset_t, so we can use the same function we do
- for core files. */
- supply_fpregset (&buf);
+ supply_fpregset (&fpregs);
}
+/* Store all valid floating-point registers in GDB's register array
+ into the process/thread specified by TID. */
-/* Set the inferior's floating-point registers to the values in
- registers[] --- but only those registers marked valid. */
static void
-store_fpregs (int tid)
+store_fpregs (int tid, int regno)
{
- int ret;
- fpregset_t buf;
+ elf_fpregset_t fpregs;
- ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf);
- if (ret < 0)
- {
- warning ("Couldn't get floating point status");
- return;
- }
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't get floating point status");
- convert_to_fpregset (&buf, registers, register_valid);
+ fill_fpregset (&fpregs, regno);
- ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &buf);
- if (ret < 0)
- {
- warning ("Couldn't write floating point status");
- return;
- }
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name ("Couldn't write floating point status");
}
-\f
-/* Transfering floating-point and SSE registers to and from GDB. */
+#else
+static void fetch_fpregs (int tid) {}
+static void store_fpregs (int tid, int regno) {}
-/* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own
- Linux kernel patch for SSE support. That patch may or may not
- actually make it into the official distribution. If you find that
- years have gone by since this code was added, and Linux isn't using
- PTRACE_GETXFPREGS, that means that our patch didn't make it, and
- you can delete this code. */
+#endif
+\f
-#ifdef HAVE_PTRACE_GETXFPREGS
-static void
-supply_xfpregset (struct user_xfpregs_struct *xfpregs)
-{
- int reg;
+/* Transfering floating-point and SSE registers to and from GDB. */
- /* Supply the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- supply_register (FP0_REGNUM + reg, (char *) &xfpregs->st_space[reg]);
-
- {
- supply_register (FCTRL_REGNUM, (char *) &xfpregs->cwd);
- supply_register (FSTAT_REGNUM, (char *) &xfpregs->swd);
- supply_register (FTAG_REGNUM, (char *) &xfpregs->twd);
- supply_register (FCOFF_REGNUM, (char *) &xfpregs->fip);
- supply_register (FDS_REGNUM, (char *) &xfpregs->fos);
- supply_register (FDOFF_REGNUM, (char *) &xfpregs->foo);
-
- /* Extract the code segment and opcode from the "fcs" member. */
- {
- long l;
-
- l = xfpregs->fcs & 0xffff;
- supply_register (FCS_REGNUM, (char *) &l);
+#ifdef HAVE_PTRACE_GETFPXREGS
- l = (xfpregs->fcs >> 16) & ((1 << 11) - 1);
- supply_register (FOP_REGNUM, (char *) &l);
- }
- }
+/* Fill GDB's register array with the floating-point and SSE register
+ values in *FPXREGSETP. */
- /* Supply the SSE registers. */
- for (reg = 0; reg < 8; reg++)
- supply_register (XMM0_REGNUM + reg, (char *) &xfpregs->xmm_space[reg]);
- supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr);
+void
+supply_fpxregset (elf_fpxregset_t *fpxregsetp)
+{
+ i387_supply_fxsave (current_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
-convert_to_xfpregset (struct user_xfpregs_struct *xfpregs,
- char *gdb_regs,
- signed char *valid)
+void
+fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno)
{
- int reg;
-
- /* Fill in the floating-point registers. */
- for (reg = 0; reg < 8; reg++)
- if (!valid || valid[reg])
- memcpy (&xfpregs->st_space[reg],
- ®isters[REGISTER_BYTE (FP0_REGNUM + reg)],
- REGISTER_RAW_SIZE(FP0_REGNUM + reg));
-
-#define fill(MEMBER, REGNO) \
- if (! valid || valid[(REGNO)]) \
- memcpy (&xfpregs->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
- sizeof (xfpregs->MEMBER))
-
- fill (cwd, FCTRL_REGNUM);
- fill (swd, FSTAT_REGNUM);
- fill (twd, FTAG_REGNUM);
- fill (fip, FCOFF_REGNUM);
- fill (foo, FDOFF_REGNUM);
- fill (fos, FDS_REGNUM);
-
-#undef fill
-
- if (! valid || valid[FCS_REGNUM])
- xfpregs->fcs
- = ((xfpregs->fcs & ~0xffff)
- | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff));
-
- if (! valid || valid[FOP_REGNUM])
- xfpregs->fcs
- = ((xfpregs->fcs & 0xffff)
- | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1))
- << 16));
-
- /* Fill in the XMM registers. */
- for (reg = 0; reg < 8; reg++)
- if (! valid || valid[reg])
- memcpy (&xfpregs->xmm_space[reg],
- ®isters[REGISTER_BYTE (XMM0_REGNUM + reg)],
- REGISTER_RAW_SIZE (XMM0_REGNUM + reg));
+ i387_fill_fxsave ((char *) fpxregsetp, regno);
}
+/* Fetch all registers covered by the PTRACE_GETFPXREGS request from
+ process/thread TID and store their values in GDB's register array.
+ Return non-zero if successful, zero otherwise. */
-/* Make a PTRACE_GETXFPREGS request, and supply all the register
- values that yields to GDB. */
static int
-fetch_xfpregs (int tid)
+fetch_fpxregs (int tid)
{
- int ret;
- struct user_xfpregs_struct xfpregs;
+ elf_fpxregset_t fpxregs;
- if (! have_ptrace_getxfpregs)
+ if (! have_ptrace_getfpxregs)
return 0;
- ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
- if (ret == -1)
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
{
if (errno == EIO)
{
- have_ptrace_getxfpregs = 0;
+ have_ptrace_getfpxregs = 0;
return 0;
}
- warning ("couldn't read floating-point and SSE registers.");
- return 0;
+ perror_with_name ("Couldn't read floating-point and SSE registers");
}
- supply_xfpregset (&xfpregs);
+ supply_fpxregset (&fpxregs);
return 1;
}
+/* Store all valid registers in GDB's register array covered by the
+ PTRACE_SETFPXREGS request into the process/thread specified by TID.
+ Return non-zero if successful, zero otherwise. */
-/* Send all the valid register values in GDB's register file covered
- by the PTRACE_SETXFPREGS request to the inferior. */
static int
-store_xfpregs (int tid)
+store_fpxregs (int tid, int regno)
{
- int ret;
- struct user_xfpregs_struct xfpregs;
+ elf_fpxregset_t fpxregs;
- if (! have_ptrace_getxfpregs)
+ if (! have_ptrace_getfpxregs)
return 0;
-
- ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
- if (ret == -1)
+
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1)
{
if (errno == EIO)
{
- have_ptrace_getxfpregs = 0;
+ have_ptrace_getfpxregs = 0;
return 0;
}
- warning ("couldn't read floating-point and SSE registers.");
- return 0;
+ perror_with_name ("Couldn't read floating-point and SSE registers");
}
- convert_to_xfpregset (&xfpregs, registers, register_valid);
+ fill_fpxregset (&fpxregs, regno);
- if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0)
- {
- warning ("Couldn't write floating-point and SSE registers.");
- return 0;
- }
+ if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1)
+ perror_with_name ("Couldn't write floating-point and SSE registers");
return 1;
}
-
-/* Fill the XMM registers in the register file with dummy values. For
+/* 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 ()
+dummy_sse_values (void)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* 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);
+ for (reg = 0; reg < tdep->num_xmm_regs; reg++)
+ regcache_raw_supply (current_regcache, XMM0_REGNUM + reg, (char *) dummy);
+ if (tdep->num_xmm_regs > 0)
+ regcache_raw_supply (current_regcache, MXCSR_REGNUM, (char *) &mxcsr);
}
#else
-/* Stub versions of the above routines, for systems that don't have
- PTRACE_GETXFPREGS. */
-static int store_xfpregs (int tid) { return 0; }
-static int fetch_xfpregs (int tid) { return 0; }
-static void dummy_sse_values () {}
-
-#endif
+static int fetch_fpxregs (int tid) { return 0; }
+static int store_fpxregs (int tid, int regno) { return 0; }
+static void dummy_sse_values (void) {}
+#endif /* HAVE_PTRACE_GETFPXREGS */
\f
+
/* Transferring arbitrary registers between GDB and inferior. */
-/* Fetch registers from the child process.
- Fetch all if regno == -1, otherwise fetch all ordinary
- registers or all floating point registers depending
- upon the value of regno. */
+/* 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)
+{
+ gdb_assert (regno >= 0 && regno < NUM_REGS);
+ return (!have_ptrace_getregs && regmap[regno] == -1);
+}
+
+int
+cannot_store_register (int regno)
+{
+ gdb_assert (regno >= 0 && regno < NUM_REGS);
+ return (!have_ptrace_getregs && regmap[regno] == -1);
+}
+
+/* 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)
{
- /* linux lwp id's are process id's */
int tid;
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* not a threaded program */
+ /* Use the old method of peeking around in `struct user' if the
+ GETREGS request isn't available. */
+ if (!have_ptrace_getregs)
+ {
+ int i;
+
+ for (i = 0; i < NUM_REGS; i++)
+ if (regno == -1 || regno == i)
+ fetch_register (i);
- /* Use the xfpregs requests whenever possible, since they transfer
- more registers in one system call, and we'll cache the results.
- But remember that fetch_xfpregs can fail, and return zero. */
+ 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. */
+
+ /* 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 (tid);
- if (fetch_xfpregs (tid))
+
+ /* The call above might reset `have_ptrace_getregs'. */
+ if (!have_ptrace_getregs)
+ {
+ fetch_inferior_registers (regno);
+ return;
+ }
+
+ if (fetch_fpxregs (tid))
return;
fetch_fpregs (tid);
return;
return;
}
- if (GETXFPREGS_SUPPLIES (regno))
+ if (GETFPXREGS_SUPPLIES (regno))
{
- if (fetch_xfpregs (tid))
+ if (fetch_fpxregs (tid))
return;
/* Either our processor or our kernel doesn't support the SSE
gdbarch. Until then, this will at least make things work
plausibly. */
fetch_fpregs (tid);
- dummy_sse_values ();
return;
}
- internal_error ("i386-linux-nat.c (fetch_inferior_registers): "
- "got request for bad register number %d", regno);
+ internal_error (__FILE__, __LINE__,
+ "Got request for bad register number %d.", regno);
}
-
-/* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register, which
- then determines whether we store all ordinary
- registers or all of the floating point registers. */
-
+/* 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 (regno)
- int regno;
+store_inferior_registers (int regno)
{
- /* linux lwp id's are process id's */
int tid;
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* not a threaded program */
+ /* Use the old method of poking around in `struct user' if the
+ SETREGS request isn't available. */
+ if (!have_ptrace_getregs)
+ {
+ int i;
- /* Use the xfpregs requests whenever possible, since they transfer
- more registers in one system call. But remember that
- store_xfpregs can fail, and return zero. */
+ for (i = 0; i < NUM_REGS; i++)
+ if (regno == -1 || regno == i)
+ store_register (i);
+
+ 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. */
+
+ /* 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);
- if (store_xfpregs (tid))
+ store_regs (tid, regno);
+ if (store_fpxregs (tid, regno))
return;
- store_fpregs (tid);
+ store_fpregs (tid, regno);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- store_regs (tid);
+ store_regs (tid, regno);
return;
}
- if (GETXFPREGS_SUPPLIES (regno))
+ if (GETFPXREGS_SUPPLIES (regno))
{
- if (store_xfpregs (tid))
+ if (store_fpxregs (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);
+ registers, so just write the FP registers in the traditional
+ way. */
+ store_fpregs (tid, regno);
return;
}
- internal_error ("i386-linux-nat.c (store_inferior_registers): "
- "got request to store bad register number %d", regno);
+ internal_error (__FILE__, __LINE__,
+ "Got request to store bad register number %d.", regno);
}
-
-
\f
-/* Interpreting register set info found in core files. */
-
-/* Provide registers to GDB from a core file.
- (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_xfpregset, which most platforms don't have.)
+/* Support for debug registers. */
- 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 (int regnum)
+{
+ int tid;
+ unsigned long value;
+
+ /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+ multi-threaded processes here. For now, pretend there is just
+ one thread. */
+ tid = PIDGET (inferior_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 vectore. 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
- WHICH says which register set corelow suspects this is:
- 0 --- the general register set, in gregset format
- 2 --- the floating-point register set, in fpregset format
- 3 --- the extended floating-point register set, in struct
- user_xfpregs_struct format
+ return value;
+}
- DUMMY isn't used on Linux. */
static void
-i386_linux_fetch_core_registers (char *core_reg_sect,
- unsigned core_reg_size,
- int which,
- CORE_ADDR dummy)
+i386_linux_dr_set (int regnum, unsigned long value)
{
- gregset_t gregset;
- fpregset_t fpregset;
+ int tid;
- switch (which)
- {
- case 0:
- if (core_reg_size != sizeof (gregset))
- warning ("wrong size gregset struct in core file");
- else
- {
- memcpy (&gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
- }
- break;
+ /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
+ multi-threaded processes here. For now, pretend there is just
+ one thread. */
+ tid = PIDGET (inferior_ptid);
- case 2:
- if (core_reg_size != sizeof (fpregset))
- warning ("wrong size fpregset struct in core file");
- else
- {
- memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
- supply_fpregset (&fpregset);
- }
- break;
-
-#ifdef HAVE_PTRACE_GETXFPREGS
- {
- struct user_xfpregs_struct xfpregset;
- case 3:
- if (core_reg_size != sizeof (struct user_xfpregs_struct))
- warning ("wrong size user_xfpregs_struct in core file");
- else
- {
- memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset));
- supply_xfpregset (&xfpregset);
- }
- break;
- }
-#endif
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, tid,
+ offsetof (struct user, u_debugreg[regnum]), value);
+ if (errno != 0)
+ perror_with_name ("Couldn't write debug register");
+}
- 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;
- }
+void
+i386_linux_dr_set_control (unsigned long control)
+{
+ i386_linux_dr_set (DR_CONTROL, control);
}
+void
+i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-static struct core_fns i386_linux_nat_core_fns =
+ i386_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+}
+
+void
+i386_linux_dr_reset_addr (int regnum)
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- i386_linux_fetch_core_registers, /* core_read_registers */
- NULL /* next */
-};
+ gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
+
+ i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+}
+unsigned long
+i386_linux_dr_get_status (void)
+{
+ return i386_linux_dr_get (DR_STATUS);
+}
\f
-/* Calling functions in shared libraries. */
-/* Find the minimal symbol named NAME, and return both the minsym
- struct and its objfile. This probably ought to be in minsym.c, but
- everything there is trying to deal with things like C++ and
- SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
- be considered too special-purpose for general consumption. */
+/* Called by libthread_db. Returns a pointer to the thread local
+ storage (or its descriptor). */
-static struct minimal_symbol *
-find_minsym_and_objfile (char *name, struct objfile **objfile_p)
+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+ lwpid_t lwpid, int idx, void **base)
{
- struct objfile *objfile;
-
- ALL_OBJFILES (objfile)
- {
- struct minimal_symbol *msym;
+ /* 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
- ALL_OBJFILE_MSYMBOLS (objfile, msym)
- {
- if (SYMBOL_NAME (msym)
- && STREQ (SYMBOL_NAME (msym), name))
- {
- *objfile_p = objfile;
- return msym;
- }
- }
- }
+ if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
+ (void *) idx, (unsigned long) &desc) < 0)
+ return PS_ERR;
- return 0;
+ *(int *)base = desc[1];
+ return PS_OK;
}
+\f
+/* The instruction for a GNU/Linux system call is:
+ int $0x80
+ or 0xcd 0x80. */
-static CORE_ADDR
-skip_hurd_resolver (CORE_ADDR pc)
-{
- /* The HURD dynamic linker is part of the GNU C library, so many
- GNU/Linux distributions use it. (All ELF versions, as far as I
- know.) An unresolved PLT entry points to "_dl_runtime_resolve",
- which calls "fixup" to patch the PLT, and then passes control to
- the function.
-
- We look for the symbol `_dl_runtime_resolve', and find `fixup' in
- the same objfile. If we are at the entry point of `fixup', then
- we set a breakpoint at the return address (at the top of the
- stack), and continue.
-
- It's kind of gross to do all these checks every time we're
- called, since they don't change once the executable has gotten
- started. But this is only a temporary hack --- upcoming versions
- of Linux will provide a portable, efficient interface for
- debugging programs that use shared libraries. */
+static const unsigned char linux_syscall[] = { 0xcd, 0x80 };
- struct objfile *objfile;
- struct minimal_symbol *resolver
- = find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
+#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
- if (resolver)
- {
- struct minimal_symbol *fixup
- = lookup_minimal_symbol ("fixup", 0, objfile);
+/* The system call number is stored in the %eax register. */
+#define LINUX_SYSCALL_REGNUM 0 /* %eax */
- if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
- return (SAVED_PC_AFTER_CALL (get_current_frame ()));
- }
+/* We are specifically interested in the sigreturn and rt_sigreturn
+ system calls. */
- return 0;
-}
+#ifndef SYS_sigreturn
+#define SYS_sigreturn 0x77
+#endif
+#ifndef SYS_rt_sigreturn
+#define SYS_rt_sigreturn 0xad
+#endif
+/* Offset to saved processor flags, from <asm/sigcontext.h>. */
+#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64)
-/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
- This function:
- 1) decides whether a PLT has sent us into the linker to resolve
- a function reference, and
- 2) if so, tells us where to set a temporary breakpoint that will
- trigger when the dynamic linker is done. */
+/* Resume execution of the inferior process.
+ If STEP is nonzero, single-step it.
+ If SIGNAL is nonzero, give it that signal. */
-CORE_ADDR
-i386_linux_skip_solib_resolver (CORE_ADDR pc)
+void
+child_resume (ptid_t ptid, int step, enum target_signal signal)
{
- CORE_ADDR result;
+ int pid = PIDGET (ptid);
- /* Plug in functions for other kinds of resolvers here. */
- result = skip_hurd_resolver (pc);
- if (result)
- return result;
+ int request = PTRACE_CONT;
- return 0;
-}
+ if (pid == -1)
+ /* Resume all threads. */
+ /* I think this only gets used in the non-threaded case, where "resume
+ all threads" and "resume inferior_ptid" are the same. */
+ pid = PIDGET (inferior_ptid);
+ if (step)
+ {
+ CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid));
+ unsigned char buf[LINUX_SYSCALL_LEN];
+
+ request = PTRACE_SINGLESTEP;
+
+ /* 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
+ restores the registers that were saved when the signal was
+ raised, including %eflags. That means that single-stepping
+ won't work. Instead, we'll have to modify the signal context
+ that's about to be restored, and set the trace flag there. */
+
+ /* First check if PC is at a system call. */
+ if (deprecated_read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0
+ && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
+ {
+ int syscall = read_register_pid (LINUX_SYSCALL_REGNUM,
+ pid_to_ptid (pid));
-\f
-/* Module initialization. */
+ /* Then check the system call number. */
+ if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn)
+ {
+ CORE_ADDR sp = read_register (I386_ESP_REGNUM);
+ CORE_ADDR addr = sp;
+ unsigned long int eflags;
+
+ if (syscall == SYS_rt_sigreturn)
+ addr = read_memory_integer (sp + 8, 4) + 20;
+
+ /* Set the trace flag in the context that's about to be
+ restored. */
+ addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET;
+ read_memory (addr, (char *) &eflags, 4);
+ eflags |= 0x0100;
+ write_memory (addr, (char *) &eflags, 4);
+ }
+ }
+ }
+
+ if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
+ perror_with_name ("ptrace");
+}
void
-_initialize_i386_linux_nat ()
+child_post_startup_inferior (ptid_t ptid)
{
- add_core_fns (&i386_linux_nat_core_fns);
+ i386_cleanup_dregs ();
+ linux_child_post_startup_inferior (ptid);
}
projects / deliverable / binutils-gdb.git / blobdiff