#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[] =
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
{
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 ()
+fetch_regs (int tid)
{
int ret, regno;
gregset_t buf;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
if (ret < 0)
{
warning ("Couldn't get registers");
/* 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;
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, (int) &buf);
+ ret = ptrace (PTRACE_GETREGS, tid, 0, (int) &buf);
if (ret < 0)
{
warning ("Couldn't get registers");
convert_to_gregset (&buf, registers, register_valid);
- ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, (int)buf);
+ ret = ptrace (PTRACE_SETREGS, tid, 0, (int)buf);
if (ret < 0)
{
warning ("Couldn't write registers");
/* 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");
/* 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
+ 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
supply_xfpregset (struct user_xfpregs_struct *xfpregs)
/* 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;
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)
/* 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;
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)
convert_to_xfpregset (&xfpregs, registers, 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;
/* 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 int store_xfpregs (int tid) { return 0; }
+static int fetch_xfpregs (int tid) { return 0; }
static void dummy_sse_values () {}
#endif
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 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 ();
- if (fetch_xfpregs ())
+ fetch_regs (tid);
+ 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;
}
store_inferior_registers (regno)
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 xfpregs requests whenever possible, since they transfer
more registers in one system call. But remember that
- fetch_xfpregs can fail, and return zero. */
+ 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 ();
+ store_fpregs (tid);
return;
}
}
+\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. */
return 0;
}
+
+
+\f
+/* Module initialization. */
+
+void
+_initialize_i386_linux_nat ()
+{
+ add_core_fns (&i386_linux_nat_core_fns);
+}
projects / deliverable / binutils-gdb.git / blobdiff