/* Native-dependent code for GNU/Linux x86 (i386 and x86-64).
- Copyright (C) 1999-2015 Free Software Foundation, Inc.
+ Copyright (C) 1999-2016 Free Software Foundation, Inc.
This file is part of GDB.
#include "inferior.h"
#include "elf/common.h"
#include "gdb_proc_service.h"
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include <sys/user.h>
#include <sys/procfs.h>
#include <sys/uio.h>
#include "nat/linux-btrace.h"
#include "nat/linux-nat.h"
#include "nat/x86-linux.h"
+#include "nat/x86-linux-dregs.h"
+#include "nat/linux-ptrace.h"
/* Per-thread arch-specific data we want to keep. */
int debug_registers_changed;
};
-/* Does the current host support PTRACE_GETREGSET? */
-int have_ptrace_getregset = -1;
-\f
-
-/* Return the offset of REGNUM in the u_debugreg field of struct
- user. */
-
-static int
-u_debugreg_offset (int regnum)
-{
- return (offsetof (struct user, u_debugreg)
- + sizeof (((struct user *) 0)->u_debugreg[0]) * regnum);
-}
-
-/* Support for debug registers. */
-
-/* Get debug register REGNUM value from the LWP specified by PTID. */
-
-static unsigned long
-x86_linux_dr_get (ptid_t ptid, int regnum)
-{
- int tid;
- unsigned long value;
-
- gdb_assert (ptid_lwp_p (ptid));
- tid = ptid_get_lwp (ptid);
-
- errno = 0;
- value = ptrace (PTRACE_PEEKUSER, tid, u_debugreg_offset (regnum), 0);
-
- if (errno != 0)
- perror_with_name (_("Couldn't read debug register"));
-
- return value;
-}
-
-/* Set debug register REGNUM to VALUE in the LWP specified by PTID. */
-
-static void
-x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
-{
- int tid;
-
- gdb_assert (ptid_lwp_p (ptid));
- tid = ptid_get_lwp (ptid);
-
- errno = 0;
- ptrace (PTRACE_POKEUSER, tid, u_debugreg_offset (regnum), value);
- if (errno != 0)
- perror_with_name (_("Couldn't write debug register"));
-}
-
-/* Return the address stored in the current inferior's debug register
- REGNUM. */
-
-static CORE_ADDR
-x86_linux_dr_get_addr (int regnum)
-{
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
-
- return x86_linux_dr_get (current_lwp_ptid (), regnum);
-}
-
-/* Return the value stored in the current inferior's debug control
- register. */
-
-static unsigned long
-x86_linux_dr_get_control (void)
-{
- return x86_linux_dr_get (current_lwp_ptid (), DR_CONTROL);
-}
-
-/* Return the value stored in the current inferior's debug status
- register. */
-
-static unsigned long
-x86_linux_dr_get_status (void)
-{
- return x86_linux_dr_get (current_lwp_ptid (), DR_STATUS);
-}
-
-/* Callback for iterate_over_lwps. Mark that our local mirror of
- LWP's debug registers has been changed, and cause LWP to stop if
- it isn't already. Values are written from our local mirror to
- the actual debug registers immediately prior to LWP resuming. */
-
-static int
-update_debug_registers_callback (struct lwp_info *lwp, void *arg)
-{
- lwp_set_debug_registers_changed (lwp, 1);
-
- if (!lwp_is_stopped (lwp))
- linux_stop_lwp (lwp);
-
- /* Continue the iteration. */
- return 0;
-}
-
-/* Store CONTROL in the debug control registers of all LWPs of the
- current inferior. */
-
-static void
-x86_linux_dr_set_control (unsigned long control)
-{
- ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
-
- iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
-}
-
-/* Store ADDR in debug register REGNUM of all LWPs of the current
- inferior. */
-
-static void
-x86_linux_dr_set_addr (int regnum, CORE_ADDR addr)
-{
- ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
-
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
-
- iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
-}
-
-/* Update the thread's debug registers if the values in our local
- mirror have been changed. */
-
-static void
-x86_linux_update_debug_registers (struct lwp_info *lwp)
-{
- ptid_t ptid = ptid_of_lwp (lwp);
- int clear_status = 0;
-
- gdb_assert (lwp_is_stopped (lwp));
-
- if (lwp_debug_registers_changed (lwp))
- {
- struct x86_debug_reg_state *state
- = x86_debug_reg_state (ptid_get_pid (ptid));
- int i;
-
- /* Prior to Linux kernel 2.6.33 commit
- 72f674d203cd230426437cdcf7dd6f681dad8b0d, setting DR0-3 to
- a value that did not match what was enabled in DR_CONTROL
- resulted in EINVAL. To avoid this we zero DR_CONTROL before
- writing address registers, only writing DR_CONTROL's actual
- value once all the addresses are in place. */
- x86_linux_dr_set (ptid, DR_CONTROL, 0);
-
- ALL_DEBUG_ADDRESS_REGISTERS (i)
- if (state->dr_ref_count[i] > 0)
- {
- x86_linux_dr_set (ptid, i, state->dr_mirror[i]);
-
- /* If we're setting a watchpoint, any change the inferior
- has made to its debug registers needs to be discarded
- to avoid x86_stopped_data_address getting confused. */
- clear_status = 1;
- }
-
- /* If DR_CONTROL is supposed to be zero then it's already set. */
- if (state->dr_control_mirror != 0)
- x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror);
-
- lwp_set_debug_registers_changed (lwp, 0);
- }
-
- if (clear_status
- || lwp_stop_reason (lwp) == TARGET_STOPPED_BY_WATCHPOINT)
- x86_linux_dr_set (ptid, DR_STATUS, 0);
-}
-
-/* Called prior to resuming a thread. */
-
-static void
-x86_linux_prepare_to_resume (struct lwp_info *lwp)
-{
- x86_linux_update_debug_registers (lwp);
-}
-
-/* Called when a new thread is detected. */
-
-static void
-x86_linux_new_thread (struct lwp_info *lwp)
-{
- lwp_set_debug_registers_changed (lwp, 1);
-}
\f
/* linux_nat_new_fork hook. */
if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
{
have_ptrace_getfpxregs = 0;
- have_ptrace_getregset = 0;
+ have_ptrace_getregset = TRIBOOL_FALSE;
return tdesc_i386_mmx_linux;
}
}
#endif
- if (have_ptrace_getregset == -1)
+ if (have_ptrace_getregset == TRIBOOL_UNKNOWN)
{
uint64_t xstateregs[(X86_XSTATE_SSE_SIZE / sizeof (uint64_t))];
struct iovec iov;
/* Check if PTRACE_GETREGSET works. */
if (ptrace (PTRACE_GETREGSET, tid,
(unsigned int) NT_X86_XSTATE, &iov) < 0)
- have_ptrace_getregset = 0;
+ have_ptrace_getregset = TRIBOOL_FALSE;
else
{
- have_ptrace_getregset = 1;
+ have_ptrace_getregset = TRIBOOL_TRUE;
/* Get XCR0 from XSAVE extended state. */
xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
PTRACE_GETREGSET is not available then set xcr0_features_bits to
zero so that the "no-features" descriptions are returned by the
switches below. */
- if (have_ptrace_getregset)
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
xcr0_features_bits = xcr0 & X86_XSTATE_ALL_MASK;
else
xcr0_features_bits = 0;
error (_("Could not enable branch tracing for %s: %s."),
target_pid_to_str (ptid), safe_strerror (errno));
- /* Fill in the size of a pointer in bits. */
- if (tinfo->ptr_bits == 0)
- {
- gdbarch = target_thread_architecture (ptid);
- tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch);
- }
return tinfo;
}
projects / deliverable / binutils-gdb.git / blobdiff