void
amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
}
void
amd64_linux_dr_reset_addr (int regnum)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
}
static void
amd64_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 i386_debug_reg_state *state
= i386_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. */
for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
if (state->dr_ref_count[i] > 0)
{
amd64_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, i386_stopped_data_address can get
confused. */
clear_status = 1;
}
amd64_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror);
lwp->arch_private->debug_registers_changed = 0;
}
if (clear_status || lwp->stopped_by_watchpoint)
amd64_linux_dr_set (lwp->ptid, DR_STATUS, 0);
}
void
amd64_linux_dr_set_control (unsigned long control)
{
amd64_linux_dr_set (DR_CONTROL, control);
}