/* Native-dependent code for Linux running on i386's, for GDB.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ 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. */
+ 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"
-/* For i386_linux_skip_solib_resolver */
+/* For i386_linux_skip_solib_resolver. */
#include "symtab.h"
-#include "frame.h"
#include "symfile.h"
#include "objfiles.h"
#include <sys/reg.h>
#endif
-/* This is a duplicate of the table in i386-xdep.c. */
+/* 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. */
+#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */
+#define PIDGET(PID) PID
+#define TIDGET(PID) 0
+#endif
+
+
+/* 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
+ `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,
+ DS, ES, FS, GS
};
-
/* Which ptrace request retrieves which registers?
These apply to the corresponding SET requests as well. */
#define GETREGS_SUPPLIES(regno) \
#define GETXFPREGS_SUPPLIES(regno) \
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
+/* 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 GETXFPREGS 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
#endif
;
-
\f
-/* Transfering the general registers between GDB, inferiors and core files. */
+/* 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. */
+
+/* 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. */
+#if !defined (CANNOT_FETCH_REGISTER)
+#define CANNOT_FETCH_REGISTER(regno) 0
+#endif
+
+/* Fetch one register. */
+
+static void
+fetch_register (regno)
+ 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;
+
+ if (CANNOT_FETCH_REGISTER (regno))
+ {
+ memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
+ supply_register (regno, buf);
+ 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_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);
+}
+
+/* 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). */
-/* 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;
+old_fetch_inferior_registers (regno)
+ int regno;
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ if (regno >= 0)
+ {
+ fetch_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ {
+ fetch_register (regno);
+ }
+ }
+}
- for (regi = 0; regi < NUM_GREGS; regi++)
+/* Registers we shouldn't try to store. */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) 0
+#endif
+
+/* Store one register. */
+
+static void
+store_register (regno)
+ 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 (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 (regno)
+ int regno;
+{
+ if (regno >= 0)
{
- supply_register (regi, (char *) (regp + regmap[regi]));
+ store_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ {
+ store_register (regno);
+ }
}
}
+\f
+/* Transfering the general-purpose registers between GDB, inferiors
+ and core files. */
+
+/* Fill GDB's register array with the genereal-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)
{
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int regi;
+
+ for (regi = 0; regi < NUM_GREGS; regi++)
+ supply_register (regi, (char *) (regp + regmap[regi]));
+}
+
+/* Convert the valid general-purpose register values in GDB's register
+ array to `struct user' format and store them in *GREGSETP. The
+ array VALID indicates which register values are valid. If VALID is
+ NULL, all registers are assumed to be valid. */
+
+static void
+convert_to_gregset (elf_gregset_t *gregsetp, signed char *valid)
+{
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
int regi;
- register greg_t *regp = (greg_t *) gregsetp;
for (regi = 0; regi < NUM_GREGS; regi++)
if (! valid || valid[regi])
*(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
}
-
-/* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all
- of them. */
+/* 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 (gregset_t *gregsetp,
- int regno)
+fill_gregset (elf_gregset_t *gregsetp, int regno)
{
if (regno == -1)
- convert_to_gregset (gregsetp, registers, 0);
- else
+ {
+ convert_to_gregset (gregsetp, NULL);
+ return;
+ }
+
+ if (GETREGS_SUPPLIES (regno))
{
signed char valid[NUM_GREGS];
+
memset (valid, 0, sizeof (valid));
valid[regno] = 1;
- convert_to_gregset (gregsetp, valid, valid);
+
+ convert_to_gregset (gregsetp, valid);
}
}
+#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 ()
+fetch_regs (int tid)
{
- int ret, regno;
- gregset_t buf;
+ elf_gregset_t regs;
+ int ret;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s);
if (ret < 0)
{
- warning ("Couldn't get registers");
+ if (errno == EIO)
+ {
+ /* The kernel we're running on doesn't support the GETREGS
+ request. Reset `have_ptrace_getregs'. */
+ have_ptrace_getregs = 0;
+ return;
+ }
+
+ warning ("Couldn't get registers.");
return;
}
- 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 ()
+store_regs (int tid)
{
- int ret, regno;
- gregset_t buf;
+ elf_gregset_t regs;
+ int ret;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s);
if (ret < 0)
{
- warning ("Couldn't get registers");
+ warning ("Couldn't get registers.");
return;
}
- convert_to_gregset (&buf, registers, register_valid);
+ convert_to_gregset (®s, register_valid);
- ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, (int)buf);
+ ret = ptrace (PTRACE_SETREGS, tid, 0, (int) ®s);
if (ret < 0)
{
- warning ("Couldn't write registers");
+ warning ("Couldn't write registers.");
return;
}
}
+#else
+
+static void fetch_regs (int tid) {}
+static void store_regs (int tid) {}
+
+#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)
+/* What is the address of st(N) within the floating-point register set F? */
+#define FPREG_ADDR(f, n) ((char *) &(f)->st_space + (n) * 10)
-/* 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;
+ int reg;
+ long l;
/* Supply the floating-point registers. */
- for (i = 0; i < 8; i++)
- supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_ADDR (fpregsetp, i));
+ for (reg = 0; reg < 8; reg++)
+ supply_register (FP0_REGNUM + reg, FPREG_ADDR (fpregsetp, reg));
+
+ /* We have to mask off the reserved bits in *FPREGSETP before
+ storing the values in GDB's register file. */
+#define supply(REGNO, MEMBER) \
+ l = fpregsetp->MEMBER & 0xffff; \
+ supply_register (REGNO, (char *) &l)
- supply_register (FCTRL_REGNUM, (char *) &fpregsetp->cwd);
- supply_register (FSTAT_REGNUM, (char *) &fpregsetp->swd);
- supply_register (FTAG_REGNUM, (char *) &fpregsetp->twd);
+ supply (FCTRL_REGNUM, cwd);
+ supply (FSTAT_REGNUM, swd);
+ supply (FTAG_REGNUM, twd);
supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip);
- supply_register (FDS_REGNUM, (char *) &fpregsetp->fos);
+ supply (FDS_REGNUM, 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);
+#undef supply
- l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
- supply_register (FOP_REGNUM, (char *) &l);
- }
+ /* Extract the code segment and opcode from the "fcs" member. */
+ l = fpregsetp->fcs & 0xffff;
+ supply_register (FCS_REGNUM, (char *) &l);
+
+ l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1);
+ supply_register (FOP_REGNUM, (char *) &l);
}
+/* Convert the valid floating-point register values in GDB's register
+ array to `struct user' format and store them in *FPREGSETP. The
+ array VALID indicates which register values are valid. If VALID is
+ NULL, all registers are assumed to be valid. */
-/* 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)
+static void
+convert_to_fpregset (elf_fpregset_t *fpregsetp, signed char *valid)
{
- int i;
+ int reg;
/* 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));
+ for (reg = 0; reg < 8; reg++)
+ if (!valid || valid[reg])
+ memcpy (FPREG_ADDR (fpregsetp, reg),
+ ®isters[REGISTER_BYTE (FP0_REGNUM + reg)],
+ REGISTER_RAW_SIZE(FP0_REGNUM + reg));
+
+ /* We're not supposed to touch the reserved bits in *FPREGSETP. */
#define fill(MEMBER, REGNO) \
if (! valid || valid[(REGNO)]) \
- memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \
- sizeof (fpregsetp->MEMBER))
+ fpregsetp->MEMBER \
+ = ((fpregsetp->MEMBER & ~0xffff) \
+ | (* (int *) ®isters[REGISTER_BYTE (REGNO)] & 0xffff))
+
+#define fill_register(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_register (fip, FCOFF_REGNUM);
fill (foo, FDOFF_REGNUM);
- fill (fos, FDS_REGNUM);
+ fill_register (fos, FDS_REGNUM);
#undef fill
+#undef fill_register
if (! valid || valid[FCS_REGNUM])
fpregsetp->fcs
<< 16));
}
-
-/* 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. */
+/* 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 (fpregset_t *fpregsetp,
- int regno)
+fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
{
- convert_to_fpregset (fpregsetp, registers, 0);
+ if (regno == -1)
+ {
+ convert_to_fpregset (fpregsetp, NULL);
+ return;
+ }
+
+ if (GETFPREGS_SUPPLIES(regno))
+ {
+ signed char valid[MAX_NUM_REGS];
+
+ memset (valid, 0, sizeof (valid));
+ valid[regno] = 1;
+
+ convert_to_fpregset (fpregsetp, valid);
+ }
}
+#ifdef HAVE_PTRACE_GETREGS
+
+/* Fetch all floating-point registers from process/thread TID and store
+ thier values in GDB's register array. */
-/* Get the whole floating point state of the process and store the
- floating point stack into registers[]. */
static void
-fetch_fpregs ()
+fetch_fpregs (int tid)
{
- int ret, regno;
- fpregset_t buf;
+ elf_fpregset_t fpregs;
+ int ret;
- ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs);
if (ret < 0)
{
- warning ("Couldn't get floating point status");
+ warning ("Couldn't get floating point status.");
return;
}
- /* 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 ()
+store_fpregs (int tid)
{
+ elf_fpregset_t fpregs;
int ret;
- fpregset_t buf;
- ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs);
if (ret < 0)
{
- warning ("Couldn't get floating point status");
+ warning ("Couldn't get floating point status.");
return;
}
- convert_to_fpregset (&buf, registers, register_valid);
+ convert_to_fpregset (&fpregs, register_valid);
- ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs);
if (ret < 0)
{
- warning ("Couldn't write floating point status");
+ warning ("Couldn't write floating point status.");
return;
}
}
+#else
+
+static void fetch_fpregs (int tid) {}
+static void store_fpregs (int tid) {}
+
+#endif
+
\f
/* Transfering floating-point and SSE registers to and from GDB. */
-
/* 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
you can delete this code. */
#ifdef HAVE_PTRACE_GETXFPREGS
+
+/* Fill GDB's register array with the floating-point and SSE register
+ values in *XFPREGS. */
+
static void
supply_xfpregset (struct user_xfpregs_struct *xfpregs)
{
supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr);
}
+/* Convert the valid floating-point and SSE registers in GDB's
+ register array to `struct user' format and store them in *XFPREGS.
+ The array VALID indicates which registers are valid. If VALID is
+ NULL, all registers are assumed to be valid. */
static void
convert_to_xfpregset (struct user_xfpregs_struct *xfpregs,
- char *gdb_regs,
signed char *valid)
{
int reg;
REGISTER_RAW_SIZE (XMM0_REGNUM + reg));
}
+/* Fetch all registers covered by the PTRACE_SETXFPREGS 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 ()
+fetch_xfpregs (int tid)
{
- int ret;
struct user_xfpregs_struct xfpregs;
+ int ret;
if (! have_ptrace_getxfpregs)
return 0;
- ret = ptrace (PTRACE_GETXFPREGS, inferior_pid, 0, &xfpregs);
+ ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
if (ret == -1)
{
if (errno == EIO)
return 0;
}
- warning ("couldn't read floating-point and SSE registers.");
+ warning ("Couldn't read floating-point and SSE registers.");
return 0;
}
return 1;
}
+/* Store all valid registers in GDB's register array covered by the
+ PTRACE_SETXFPREGS 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 ()
+store_xfpregs (int tid)
{
- int ret;
struct user_xfpregs_struct xfpregs;
+ int ret;
if (! have_ptrace_getxfpregs)
return 0;
- ret = ptrace (PTRACE_GETXFPREGS, inferior_pid, 0, &xfpregs);
+ ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
if (ret == -1)
{
if (errno == EIO)
return 0;
}
- warning ("couldn't read floating-point and SSE registers.");
+ warning ("Couldn't read floating-point and SSE registers.");
return 0;
}
- convert_to_xfpregset (&xfpregs, registers, register_valid);
+ convert_to_xfpregset (&xfpregs, register_valid);
- if (ptrace (PTRACE_SETXFPREGS, inferior_pid, 0, &xfpregs) < 0)
+ if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0)
{
warning ("Couldn't write floating-point and SSE registers.");
return 0;
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)
{
/* C doesn't have a syntax for NaN's, so write it out as an array of
longs. */
/* Stub versions of the above routines, for systems that don't have
PTRACE_GETXFPREGS. */
-static int store_xfpregs () { return 0; }
-static int fetch_xfpregs () { return 0; }
-static void dummy_sse_values () {}
+static int store_xfpregs (int tid) { return 0; }
+static int fetch_xfpregs (int tid) { return 0; }
+static void dummy_sse_values (void) {}
#endif
\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. */
+/* 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)
{
- /* 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. */
+ 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 (regno);
+ return;
+ }
+
+ /* Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_pid)) == 0)
+ tid = inferior_pid; /* Not a threaded program. */
+
+ /* Use the PTRACE_GETXFPREGS request whenever possible, since it
+ transfers more registers in one system call, and we'll cache the
+ results. But remember that fetch_xfpregs can fail, and return
+ zero. */
if (regno == -1)
{
- fetch_regs ();
- if (fetch_xfpregs ())
+ fetch_regs (tid);
+
+ /* The call above might reset `have_ptrace_getregs'. */
+ if (! have_ptrace_getregs)
+ {
+ old_fetch_inferior_registers (-1);
+ return;
+ }
+
+ if (fetch_xfpregs (tid))
return;
- fetch_fpregs ();
+ fetch_fpregs (tid);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- fetch_regs ();
+ fetch_regs (tid);
return;
}
if (GETXFPREGS_SUPPLIES (regno))
{
- if (fetch_xfpregs ())
+ if (fetch_xfpregs (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 ();
+ fetch_fpregs (tid);
dummy_sse_values ();
return;
}
"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)
{
- /* Use the xfpregs requests whenever possible, since they transfer
- more registers in one system call. But remember that
- fetch_xfpregs can fail, and return zero. */
+ 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 (regno);
+ return;
+ }
+
+ /* Linux LWP ID's are process ID's. */
+ if ((tid = TIDGET (inferior_pid)) == 0)
+ tid = inferior_pid; /* Not a threaded program. */
+
+ /* Use the PTRACE_SETXFPREGS requests whenever possibl, since it
+ transfers more registers in one system call. But remember that
+ store_xfpregs can fail, and return zero. */
if (regno == -1)
{
- store_regs ();
- if (store_xfpregs ())
+ store_regs (tid);
+ if (store_xfpregs (tid))
return;
- store_fpregs ();
+ store_fpregs (tid);
return;
}
if (GETREGS_SUPPLIES (regno))
{
- store_regs ();
+ store_regs (tid);
return;
}
if (GETXFPREGS_SUPPLIES (regno))
{
- if (store_xfpregs ())
+ if (store_xfpregs (tid))
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 ();
+ registers, so just write the FP registers in the traditional
+ way. */
+ store_fpregs (tid);
return;
}
- internal_error ("i386-linux-nat.c (store_inferior_registers): "
- "got request to store bad register number %d", regno);
+ internal_error ("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.)
+
+ 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.
+
+ 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 struct
+ user_xfpregs_struct format
+
+ REG_ADDR isn't used on Linux. */
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+ int which, CORE_ADDR reg_addr)
+{
+ elf_gregset_t gregset;
+ elf_fpregset_t fpregset;
+
+ switch (which)
+ {
+ 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;
+
+ 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;
+
+#ifdef HAVE_PTRACE_GETXFPREGS
+ {
+ struct user_xfpregs_struct xfpregset;
+
+ case 3:
+ if (core_reg_size != sizeof (xfpregset))
+ warning ("Wrong size user_xfpregs_struct in core file.");
+ else
+ {
+ memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset));
+ supply_xfpregset (&xfpregset);
+ }
+ break;
+ }
+#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;
+ }
+}
\f
/* Calling functions in shared libraries. */
+/* FIXME: kettenis/2000-03-05: Doesn't this belong in a
+ target-dependent file? The function
+ `i386_linux_skip_solib_resolver' is mentioned in
+ `config/i386/tm-linux.h'. */
/* Find the minimal symbol named NAME, and return both the minsym
struct and its objfile. This probably ought to be in minsym.c, but
return 0;
}
-
/* 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
return 0;
}
+
+\f
+/* Register that we are able to handle Linux ELF core file formats. */
+
+static struct core_fns linux_elf_core_fns =
+{
+ bfd_target_elf_flavour, /* core_flavour */
+ default_check_format, /* check_format */
+ default_core_sniffer, /* core_sniffer */
+ fetch_core_registers, /* core_read_registers */
+ NULL /* next */
+};
+
+void
+_initialize_i386_linux_nat ()
+{
+ add_core_fns (&linux_elf_core_fns);
+}
projects / deliverable / binutils-gdb.git / blobdiff