#include "i387-fp.h"
#include "x86-low.h"
#include "x86-xstate.h"
+#include "nat/gdb_ptrace.h"
#include "gdb_proc_service.h"
/* Don't include elf/common.h if linux/elf.h got included by
#include "tdesc.h"
#include "tracepoint.h"
#include "ax.h"
+#include "nat/linux-nat.h"
+#include "nat/x86-linux.h"
+#include "nat/x86-linux-dregs.h"
#ifdef __x86_64__
/* Defined in auto-generated file amd64-linux.c. */
#include <sys/reg.h>
#include <sys/procfs.h>
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include <sys/uio.h>
-#ifndef PTRACE_GETREGSET
-#define PTRACE_GETREGSET 0x4204
-#endif
-
-#ifndef PTRACE_SETREGSET
-#define PTRACE_SETREGSET 0x4205
-#endif
-
-
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
struct x86_debug_reg_state debug_reg_state;
};
-/* Per-thread arch-specific data we want to keep. */
-
-struct arch_lwp_info
-{
- /* Non-zero if our copy differs from what's recorded in the thread. */
- int debug_registers_changed;
-};
-
#ifdef __x86_64__
/* Mapping between the general-purpose registers in `struct user'
return 0;
}
\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. */
-
-static unsigned long
-x86_linux_dr_get (ptid_t ptid, int regnum)
-{
- int tid;
- unsigned long value;
-
- tid = ptid_get_lwp (ptid);
-
- errno = 0;
- value = ptrace (PTRACE_PEEKUSER, tid, u_debugreg_offset (regnum), 0);
- if (errno != 0)
- error ("Couldn't read debug register");
-
- return value;
-}
-
-static void
-x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
-{
- int tid;
-
- tid = ptid_get_lwp (ptid);
-
- errno = 0;
- ptrace (PTRACE_POKEUSER, tid, u_debugreg_offset (regnum), value);
- if (errno != 0)
- error ("Couldn't write debug register");
-}
-
-static int
-update_debug_registers_callback (struct inferior_list_entry *entry,
- void *pid_p)
-{
- struct thread_info *thr = (struct thread_info *) entry;
- struct lwp_info *lwp = get_thread_lwp (thr);
- int pid = *(int *) pid_p;
-
- /* Only update the threads of this process. */
- if (pid_of (thr) == pid)
- {
- /* 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);
- }
-
- return 0;
-}
-
-/* Update the inferior's debug register REGNUM from STATE. */
-
-static void
-x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
-{
- /* Only update the threads of this process. */
- int pid = pid_of (current_thread);
-
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
-
- find_inferior (&all_threads, update_debug_registers_callback, &pid);
-}
-
-/* Return the inferior's debug register REGNUM. */
-
-static CORE_ADDR
-x86_dr_low_get_addr (int regnum)
-{
- ptid_t ptid = ptid_of (current_thread);
-
- gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
-
- return x86_linux_dr_get (ptid, regnum);
-}
-
-/* Update the inferior's DR7 debug control register from STATE. */
-
-static void
-x86_dr_low_set_control (unsigned long control)
-{
- /* Only update the threads of this process. */
- int pid = pid_of (current_thread);
-
- find_inferior (&all_threads, update_debug_registers_callback, &pid);
-}
-
-/* Return the inferior's DR7 debug control register. */
-
-static unsigned long
-x86_dr_low_get_control (void)
-{
- ptid_t ptid = ptid_of (current_thread);
-
- return x86_linux_dr_get (ptid, DR_CONTROL);
-}
-
-/* Get the value of the DR6 debug status register from the inferior
- and record it in STATE. */
-
-static unsigned long
-x86_dr_low_get_status (void)
-{
- ptid_t ptid = ptid_of (current_thread);
-
- return x86_linux_dr_get (ptid, DR_STATUS);
-}
-
/* Low-level function vector. */
struct x86_dr_low_type x86_dr_low =
{
- x86_dr_low_set_control,
- x86_dr_low_set_addr,
- x86_dr_low_get_addr,
- x86_dr_low_get_status,
- x86_dr_low_get_control,
+ x86_linux_dr_set_control,
+ x86_linux_dr_set_addr,
+ x86_linux_dr_get_addr,
+ x86_linux_dr_get_status,
+ x86_linux_dr_get_control,
sizeof (void *),
};
\f
switch (type)
{
- case raw_bkpt_type_sw:
- return insert_memory_breakpoint (bp);
-
case raw_bkpt_type_hw:
case raw_bkpt_type_write_wp:
case raw_bkpt_type_access_wp:
switch (type)
{
- case raw_bkpt_type_sw:
- return remove_memory_breakpoint (bp);
-
case raw_bkpt_type_hw:
case raw_bkpt_type_write_wp:
case raw_bkpt_type_access_wp:
return info;
}
-/* Called when a new thread is detected. */
-
-static struct arch_lwp_info *
-x86_linux_new_thread (void)
-{
- struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
-
- info->debug_registers_changed = 1;
-
- return info;
-}
-
-/* Called when resuming a thread.
- If the debug regs have changed, update the thread's copies. */
+/* Target routine for linux_new_fork. */
static void
-x86_linux_prepare_to_resume (struct lwp_info *lwp)
+x86_linux_new_fork (struct process_info *parent, struct process_info *child)
{
- ptid_t ptid = ptid_of (get_lwp_thread (lwp));
- int clear_status = 0;
-
- if (lwp->arch_private->debug_registers_changed)
- {
- int i;
- int pid = ptid_get_pid (ptid);
- struct process_info *proc = find_process_pid (pid);
- struct x86_debug_reg_state *state
- = &proc->priv->arch_private->debug_reg_state;
+ /* These are allocated by linux_add_process. */
+ gdb_assert (parent->priv != NULL
+ && parent->priv->arch_private != NULL);
+ gdb_assert (child->priv != NULL
+ && child->priv->arch_private != NULL);
- x86_linux_dr_set (ptid, DR_CONTROL, 0);
+ /* Linux kernel before 2.6.33 commit
+ 72f674d203cd230426437cdcf7dd6f681dad8b0d
+ will inherit hardware debug registers from parent
+ on fork/vfork/clone. Newer Linux kernels create such tasks with
+ zeroed debug registers.
- ALL_DEBUG_ADDRESS_REGISTERS (i)
- if (state->dr_ref_count[i] > 0)
- {
- x86_linux_dr_set (ptid, i, state->dr_mirror[i]);
+ GDB core assumes the child inherits the watchpoints/hw
+ breakpoints of the parent, and will remove them all from the
+ forked off process. Copy the debug registers mirrors into the
+ new process so that all breakpoints and watchpoints can be
+ removed together. The debug registers mirror will become zeroed
+ in the end before detaching the forked off process, thus making
+ this compatible with older Linux kernels too. */
- /* If we're setting a watchpoint, any change the inferior
- had done itself to the debug registers needs to be
- discarded, otherwise, x86_dr_stopped_data_address can
- get confused. */
- clear_status = 1;
- }
+ *child->priv->arch_private = *parent->priv->arch_private;
+}
- if (state->dr_control_mirror != 0)
- x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror);
+/* See nat/x86-dregs.h. */
- lwp->arch_private->debug_registers_changed = 0;
- }
+struct x86_debug_reg_state *
+x86_debug_reg_state (pid_t pid)
+{
+ struct process_info *proc = find_process_pid (pid);
- if (clear_status || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT)
- x86_linux_dr_set (ptid, DR_STATUS, 0);
+ return &proc->priv->arch_private->debug_reg_state;
}
\f
/* When GDBSERVER is built as a 64-bit application on linux, the
#endif
;
-/* Does the current host support PTRACE_GETREGSET? */
-static int have_ptrace_getregset = -1;
-
/* Get Linux/x86 target description from running target. */
static const struct target_desc *
with "i386" in qSupported query, it supports x86 XML target
descriptions. */
use_xml = 0;
- if (query != NULL && strncmp (query, "xmlRegisters=", 13) == 0)
+ if (query != NULL && startswith (query, "xmlRegisters="))
{
char *copy = xstrdup (query + 13);
char *p;
x86_siginfo_fixup,
x86_linux_new_process,
x86_linux_new_thread,
+ x86_linux_new_fork,
x86_linux_prepare_to_resume,
x86_linux_process_qsupported,
x86_supports_tracepoints,
projects / deliverable / binutils-gdb.git / blobdiff