/* 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>
#endif
#include "x86-xstate.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
-
-/* Support for debug registers. */
-
-/* Get debug register REGNUM value from only the one LWP of 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,
- offsetof (struct user, u_debugreg[regnum]), 0);
- if (errno != 0)
- perror_with_name (_("Couldn't read debug register"));
-
- return value;
-}
-
-/* Set debug register REGNUM to VALUE in only the one LWP of 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,
- offsetof (struct user, u_debugreg[regnum]), value);
- if (errno != 0)
- perror_with_name (_("Couldn't write debug register"));
-}
-
-/* Return the inferior's debug register REGNUM. */
-
-static CORE_ADDR
-x86_linux_dr_get_addr (int regnum)
-{
- /* DR6 and DR7 are retrieved with some other way. */
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
-
- return x86_linux_dr_get (inferior_ptid, regnum);
-}
-
-/* Return the inferior's DR7 debug control register. */
-
-static unsigned long
-x86_linux_dr_get_control (void)
-{
- return x86_linux_dr_get (inferior_ptid, DR_CONTROL);
-}
-
-/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
-
-static unsigned long
-x86_linux_dr_get_status (void)
-{
- return x86_linux_dr_get (inferior_ptid, DR_STATUS);
-}
-
-/* Callback for iterate_over_lwps. Update the debug registers of
- LWP. */
-
-static int
-update_debug_registers_callback (struct lwp_info *lwp, void *arg)
-{
- if (lwp->arch_private == NULL)
- lwp->arch_private = XCNEW (struct arch_lwp_info);
-
- /* The actual update is done later just before resuming the lwp, we
- just mark that the registers need updating. */
- lwp->arch_private->debug_registers_changed = 1;
-
- /* If the lwp isn't stopped, force it to momentarily pause, so we
- can update its debug registers. */
- if (!lwp->stopped)
- linux_stop_lwp (lwp);
-
- /* Continue the iteration. */
- return 0;
-}
-
-/* Set DR_CONTROL to CONTROL in 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 (inferior_ptid));
-
- iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
-}
-
-/* Set address REGNUM (zero based) to ADDR in 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 (inferior_ptid));
-
- gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-
- iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
-}
-
-/* Called when resuming a thread.
- If the debug regs have changed, update the thread's copies. */
-
-static void
-x86_linux_prepare_to_resume (struct lwp_info *lwp)
-{
- int clear_status = 0;
-
- /* NULL means this is the main thread still going through the shell,
- or, no watchpoint has been set yet. In that case, there's
- nothing to do. */
- if (lwp->arch_private == NULL)
- return;
-
- if (lwp->arch_private->debug_registers_changed)
- {
- struct x86_debug_reg_state *state
- = x86_debug_reg_state (ptid_get_pid (lwp->ptid));
- int i;
-
- /* On Linux kernel before 2.6.33 commit
- 72f674d203cd230426437cdcf7dd6f681dad8b0d
- if you enable a breakpoint by the DR_CONTROL bits you need to have
- already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers.
-
- Ensure DR_CONTROL gets written as the very last register here. */
-
- /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a
- value that doesn't match what is enabled in DR_CONTROL
- results in EINVAL. */
- x86_linux_dr_set (lwp->ptid, DR_CONTROL, 0);
-
- ALL_DEBUG_ADDRESS_REGISTERS (i)
- if (state->dr_ref_count[i] > 0)
- {
- x86_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]);
-
- /* If we're setting a watchpoint, any change the inferior
- had done itself to the debug registers needs to be
- discarded, otherwise, x86_stopped_data_address can get
- confused. */
- clear_status = 1;
- }
-
- /* If DR_CONTROL is supposed to be zero, we've already set it
- above. */
- if (state->dr_control_mirror != 0)
- x86_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror);
-
- lwp->arch_private->debug_registers_changed = 0;
- }
-
- if (clear_status || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT)
- x86_linux_dr_set (lwp->ptid, DR_STATUS, 0);
-}
-
-static void
-x86_linux_new_thread (struct lwp_info *lp)
-{
- struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
-
- info->debug_registers_changed = 1;
-
- lp->arch_private = info;
-}
\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;
/* Enable branch tracing. */
static struct btrace_target_info *
-x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid)
+x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid,
+ const struct btrace_config *conf)
{
struct btrace_target_info *tinfo;
struct gdbarch *gdbarch;
errno = 0;
- tinfo = linux_enable_btrace (ptid);
+ tinfo = linux_enable_btrace (ptid, conf);
if (tinfo == NULL)
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. */
- gdbarch = target_thread_architecture (ptid);
- tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch);
-
return tinfo;
}
{
return linux_read_btrace (data, btinfo, type);
}
+
+/* See to_btrace_conf in target.h. */
+
+static const struct btrace_config *
+x86_linux_btrace_conf (struct target_ops *self,
+ const struct btrace_target_info *btinfo)
+{
+ return linux_btrace_conf (btinfo);
+}
+
\f
/* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to
t->to_disable_btrace = x86_linux_disable_btrace;
t->to_teardown_btrace = x86_linux_teardown_btrace;
t->to_read_btrace = x86_linux_read_btrace;
+ t->to_btrace_conf = x86_linux_btrace_conf;
return t;
}
projects / deliverable / binutils-gdb.git / blobdiff