#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
+#endif
+
/* This is a duplicate of the table in i386-xdep.c. */
static int regmap[] =
};
+/* 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)
+#define GETXFPREGS_SUPPLIES(regno) \
+ (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
+
+/* 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
+ for this to be a simple variable. */
+int have_ptrace_getxfpregs =
+#ifdef HAVE_PTRACE_GETXFPREGS
+ 1
+#else
+ 0
+#endif
+;
+
+
+\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. */
}
}
+
/* 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.
*(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)];
}
+
+/* Store GDB's value for REGNO in *GREGSETP. If REGNO is -1, do all
+ of them. */
void
fill_gregset (gregset_t *gregsetp,
int regno)
{
if (regno == -1)
convert_to_gregset (gregsetp, registers, 0);
- else
+ else if (regno >= 0 && regno < NUM_GREGS)
{
signed char valid[NUM_GREGS];
memset (valid, 0, sizeof (valid));
valid[regno] = 1;
- convert_to_gregset (gregsetp, valid, valid);
+ convert_to_gregset (gregsetp, registers, valid);
+ }
+}
+
+
+/* Read the general registers from the process, and store them
+ in registers[]. */
+static void
+fetch_regs (int tid)
+{
+ int ret, regno;
+ gregset_t buf;
+
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
+ if (ret < 0)
+ {
+ warning ("Couldn't get registers");
+ return;
+ }
+
+ supply_gregset (&buf);
+}
+
+
+/* Set the inferior's general registers to the values in registers[]
+ --- but only those registers marked as valid. */
+static void
+store_regs (int tid)
+{
+ int ret, regno;
+ gregset_t buf;
+
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
+ if (ret < 0)
+ {
+ warning ("Couldn't get registers");
+ return;
+ }
+
+ convert_to_gregset (&buf, registers, register_valid);
+
+ ret = ptrace (PTRACE_SETREGS, tid, 0, (int)buf);
+ if (ret < 0)
+ {
+ warning ("Couldn't write registers");
+ return;
}
}
-/* Where does st(N) start in the fpregset_t structure F? */
-#define FPREGSET_T_FPREG_OFFSET(f, n) \
+\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)
/* Fill GDB's register file with the floating-point register values in
/* Supply the floating-point registers. */
for (i = 0; i < 8; i++)
- supply_register (FP0_REGNUM + i, FPREGSET_T_FPREG_OFFSET (fpregsetp, 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);
/* Fill in the floating-point registers. */
for (i = 0; i < 8; i++)
if (!valid || valid[i])
- memcpy (FPREGSET_T_FPREG_OFFSET (fpregsetp, i),
+ memcpy (FPREGSET_T_FPREG_ADDR (fpregsetp, i),
®isters[REGISTER_BYTE (FP0_REGNUM + i)],
REGISTER_RAW_SIZE(FP0_REGNUM + i));
/* 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;
- ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf);
if (ret < 0)
{
warning ("Couldn't get floating point status");
/* 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)
{
int ret;
fpregset_t buf;
- ret = ptrace (PTRACE_GETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &buf);
if (ret < 0)
{
warning ("Couldn't get floating point status");
convert_to_fpregset (&buf, registers, register_valid);
- ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &buf);
if (ret < 0)
{
warning ("Couldn't write floating point status");
}
}
+\f
+/* Transfering floating-point and SSE registers to and from GDB. */
-/* Read the general registers from the process, and store them
- in registers[]. */
+
+/* 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. */
+
+#ifdef HAVE_PTRACE_GETXFPREGS
static void
-fetch_regs ()
+supply_xfpregset (struct user_xfpregs_struct *xfpregs)
{
- int ret, regno;
- gregset_t buf;
+ int reg;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
- if (ret < 0)
+ /* 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. */
{
- warning ("Couldn't get registers");
- return;
+ long l;
+
+ l = xfpregs->fcs & 0xffff;
+ supply_register (FCS_REGNUM, (char *) &l);
+
+ l = (xfpregs->fcs >> 16) & ((1 << 11) - 1);
+ supply_register (FOP_REGNUM, (char *) &l);
}
+ }
- supply_gregset (&buf);
+ /* 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);
}
-/* Set the inferior's general registers to the values in registers[]
- --- but only those registers marked as valid. */
static void
-store_regs ()
+convert_to_xfpregset (struct user_xfpregs_struct *xfpregs,
+ char *gdb_regs,
+ signed char *valid)
{
- int ret, regno;
- gregset_t buf;
+ int reg;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
- if (ret < 0)
+ /* 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));
+}
+
+
+/* Make a PTRACE_GETXFPREGS request, and supply all the register
+ values that yields to GDB. */
+static int
+fetch_xfpregs (int tid)
+{
+ int ret;
+ struct user_xfpregs_struct xfpregs;
+
+ if (! have_ptrace_getxfpregs)
+ return 0;
+
+ ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
+ if (ret == -1)
{
- warning ("Couldn't get registers");
- return;
+ if (errno == EIO)
+ {
+ have_ptrace_getxfpregs = 0;
+ return 0;
+ }
+
+ warning ("couldn't read floating-point and SSE registers.");
+ return 0;
}
- convert_to_gregset (&buf, registers, register_valid);
+ supply_xfpregset (&xfpregs);
+ return 1;
+}
- ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, (int)buf);
- if (ret < 0)
+
+/* 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)
+{
+ int ret;
+ struct user_xfpregs_struct xfpregs;
+
+ if (! have_ptrace_getxfpregs)
+ return 0;
+
+ ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs);
+ if (ret == -1)
{
- warning ("Couldn't write registers");
- return;
+ if (errno == EIO)
+ {
+ have_ptrace_getxfpregs = 0;
+ return 0;
+ }
+
+ warning ("couldn't read floating-point and SSE registers.");
+ return 0;
}
+
+ convert_to_xfpregset (&xfpregs, registers, register_valid);
+
+ 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
+ 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 ()
+{
+ /* 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
+
+/* 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
+
+\f
+/* Transferring arbitrary registers between GDB and inferior. */
/* Fetch registers from the child process.
Fetch all if regno == -1, otherwise fetch all ordinary
void
fetch_inferior_registers (int regno)
{
- if (regno < NUM_GREGS || regno == -1)
- fetch_regs ();
+ /* 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 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. */
+ if (regno == -1)
+ {
+ fetch_regs (tid);
+ if (fetch_xfpregs (tid))
+ return;
+ fetch_fpregs (tid);
+ return;
+ }
+
+ if (GETREGS_SUPPLIES (regno))
+ {
+ fetch_regs (tid);
+ return;
+ }
+
+ if (GETXFPREGS_SUPPLIES (regno))
+ {
+ if (fetch_xfpregs (tid))
+ return;
+
+ /* Either our processor or our kernel doesn't support the SSE
+ registers, so read the FP registers in the traditional way,
+ and fill the SSE registers with dummy values. It would be
+ more graceful to handle differences in the register set using
+ gdbarch. Until then, this will at least make things work
+ plausibly. */
+ fetch_fpregs (tid);
+ dummy_sse_values ();
+ return;
+ }
- if (regno >= NUM_GREGS || regno == -1)
- fetch_fpregs ();
+ internal_error ("i386-linux-nat.c (fetch_inferior_registers): "
+ "got request for bad register number %d", regno);
}
store_inferior_registers (regno)
int regno;
{
- if (regno < NUM_GREGS || regno == -1)
- store_regs ();
+ /* 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 xfpregs requests whenever possible, since they transfer
+ more registers in one system call. But remember that
+ store_xfpregs can fail, and return zero. */
+ if (regno == -1)
+ {
+ store_regs (tid);
+ if (store_xfpregs (tid))
+ return;
+ store_fpregs (tid);
+ return;
+ }
+
+ if (GETREGS_SUPPLIES (regno))
+ {
+ store_regs (tid);
+ return;
+ }
- if (regno >= NUM_GREGS || regno == -1)
- store_fpregs ();
+ if (GETXFPREGS_SUPPLIES (regno))
+ {
+ 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 (tid);
+ return;
+ }
+
+ internal_error ("i386-linux-nat.c (store_inferior_registers): "
+ "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 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
+
+ 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)
+{
+ gregset_t gregset;
+ fpregset_t fpregset;
+
+ 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;
+
+ 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
+
+ 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;
+ }
+}
+
+
+static struct core_fns i386_linux_nat_core_fns =
+{
+ 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 */
+};
+
+\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
return 0;
}
+
+
+\f
+/* Module initialization. */
+
+void
+_initialize_i386_linux_nat ()
+{
+ add_core_fns (&i386_linux_nat_core_fns);
+}
projects / deliverable / binutils-gdb.git / blobdiff