/* Native-dependent code for GNU/Linux x86-64.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2012 Free Software Foundation, Inc.
Contributed by Jiri Smid, SuSE Labs.
This file is part of GDB.
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "regset.h"
#include "linux-nat.h"
#include "amd64-linux-tdep.h"
#include "gdb_assert.h"
#include "gdb_string.h"
+#include "elf/common.h"
+#include <sys/uio.h>
#include <sys/ptrace.h>
#include <sys/debugreg.h>
#include <sys/syscall.h>
<asm/ptrace.h> because the latter redefines FS and GS for no apparent
reason, and those definitions don't match the ones that libpthread_db
uses, which come from <sys/reg.h>. */
-/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
+/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
been removed from ptrace.h in the kernel. However, better safe than
sorry. */
#include <asm/ptrace.h>
#include "i386-linux-tdep.h"
#include "amd64-nat.h"
#include "i386-nat.h"
+#include "i386-xstate.h"
-/* Mapping between the general-purpose registers in GNU/Linux x86-64
- `struct user' format and GDB's register cache layout. */
+#ifndef PTRACE_GETREGSET
+#define PTRACE_GETREGSET 0x4204
+#endif
+
+#ifndef PTRACE_SETREGSET
+#define PTRACE_SETREGSET 0x4205
+#endif
-static int amd64_linux_gregset64_reg_offset[] =
+/* Per-thread arch-specific data we want to keep. */
+
+struct arch_lwp_info
{
- RAX * 8, RBX * 8, /* %rax, %rbx */
- RCX * 8, RDX * 8, /* %rcx, %rdx */
- RSI * 8, RDI * 8, /* %rsi, %rdi */
- RBP * 8, RSP * 8, /* %rbp, %rsp */
- R8 * 8, R9 * 8, /* %r8 ... */
- R10 * 8, R11 * 8,
- R12 * 8, R13 * 8,
- R14 * 8, R15 * 8, /* ... %r15 */
- RIP * 8, EFLAGS * 8, /* %rip, %eflags */
- CS * 8, SS * 8, /* %cs, %ss */
- DS * 8, ES * 8, /* %ds, %es */
- FS * 8, GS * 8, /* %fs, %gs */
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1, -1,
- ORIG_RAX * 8
+ /* Non-zero if our copy differs from what's recorded in the thread. */
+ int debug_registers_changed;
};
-\f
+
+/* Does the current host support PTRACE_GETREGSET? */
+static int have_ptrace_getregset = -1;
/* Mapping between the general-purpose registers in GNU/Linux x86-64
`struct user' format and GDB's register cache layout for GNU/Linux
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
ORIG_RAX * 8 /* "orig_eax" */
};
\f
{
elf_fpregset_t fpregs;
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name (_("Couldn't get floating point status"));
+ if (have_ptrace_getregset)
+ {
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't get extended state status"));
+
+ amd64_supply_xsave (regcache, -1, xstateregs);
+ }
+ else
+ {
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
- amd64_supply_fxsave (regcache, -1, &fpregs);
+ amd64_supply_fxsave (regcache, -1, &fpregs);
+ }
}
}
{
elf_fpregset_t fpregs;
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name (_("Couldn't get floating point status"));
+ if (have_ptrace_getregset)
+ {
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't get extended state status"));
- amd64_collect_fxsave (regcache, regnum, &fpregs);
+ amd64_collect_xsave (regcache, regnum, xstateregs, 0);
- if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
- perror_with_name (_("Couldn't write floating point status"));
+ if (ptrace (PTRACE_SETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ perror_with_name (_("Couldn't write extended state status"));
+ }
+ else
+ {
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ amd64_collect_fxsave (regcache, regnum, &fpregs);
- return;
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
+ perror_with_name (_("Couldn't write floating point status"));
+ }
}
}
\f
/* Support for debug registers. */
-static unsigned long amd64_linux_dr[DR_CONTROL + 1];
-
static unsigned long
amd64_linux_dr_get (ptid_t ptid, int regnum)
{
if (tid == 0)
tid = PIDGET (ptid);
- /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
- ptrace call fails breaks debugging remote targets. The correct
- way to fix this is to add the hardware breakpoint and watchpoint
- stuff to the target vector. For now, just return zero if the
- ptrace call fails. */
errno = 0;
value = ptrace (PTRACE_PEEKUSER, tid,
offsetof (struct user, u_debugreg[regnum]), 0);
if (errno != 0)
-#if 0
perror_with_name (_("Couldn't read debug register"));
-#else
- return 0;
-#endif
return value;
}
+/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */
+
static void
amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
perror_with_name (_("Couldn't write debug register"));
}
+/* Return the inferior's debug register REGNUM. */
+
+static CORE_ADDR
+amd64_linux_dr_get_addr (int regnum)
+{
+ /* DR6 and DR7 are retrieved with some other way. */
+ gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
+
+ return amd64_linux_dr_get (inferior_ptid, regnum);
+}
+
+/* Return the inferior's DR7 debug control register. */
+
+static unsigned long
+amd64_linux_dr_get_control (void)
+{
+ return amd64_linux_dr_get (inferior_ptid, DR_CONTROL);
+}
+
+/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
+
+static unsigned long
+amd64_linux_dr_get_status (void)
+{
+ return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
+}
+
+/* Callback for linux_nat_iterate_watchpoint_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
amd64_linux_dr_set_control (unsigned long control)
{
- struct lwp_info *lp;
- ptid_t ptid;
-
- amd64_linux_dr[DR_CONTROL] = control;
- ALL_LWPS (lp, ptid)
- amd64_linux_dr_set (ptid, DR_CONTROL, control);
+ linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
}
+/* Set address REGNUM (zero based) to ADDR in all LWPs of the current
+ inferior. */
+
static void
amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
{
- struct lwp_info *lp;
- ptid_t ptid;
-
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- amd64_linux_dr[DR_FIRSTADDR + regnum] = addr;
- ALL_LWPS (lp, ptid)
- amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
+ linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
}
+/* Called when resuming a thread.
+ If the debug regs have changed, update the thread's copies. */
+
static void
-amd64_linux_dr_reset_addr (int regnum)
+amd64_linux_prepare_to_resume (struct lwp_info *lwp)
{
- amd64_linux_dr_set_addr (regnum, 0);
-}
+ int clear_status = 0;
-static unsigned long
-amd64_linux_dr_get_status (void)
-{
- return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
+ /* 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 ();
+ 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);
}
static void
-amd64_linux_new_thread (ptid_t ptid)
+amd64_linux_new_thread (struct lwp_info *lp)
{
- int i;
+ struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
- amd64_linux_dr_set (ptid, i, amd64_linux_dr[i]);
+ info->debug_registers_changed = 1;
- amd64_linux_dr_set (ptid, DR_CONTROL, amd64_linux_dr[DR_CONTROL]);
+ lp->arch_private = info;
}
\f
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
- if (gdbarch_ptr_bit (current_gdbarch) == 32)
+ if (gdbarch_ptr_bit (target_gdbarch) == 32)
{
/* The full structure is found in <asm-i386/ldt.h>. The second
integer is the LDT's base_address and that is used to locate
to->si_errno = from->si_errno;
to->si_code = from->si_code;
- if (to->si_code < 0)
+ if (to->si_code == SI_TIMER)
{
+ to->cpt_si_timerid = from->si_timerid;
+ to->cpt_si_overrun = from->si_overrun;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else if (to->si_code == SI_USER)
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
}
- else if (to->si_code == SI_TIMER)
+ else if (to->si_code < 0)
{
- to->cpt_si_timerid = from->si_timerid;
- to->cpt_si_overrun = from->si_overrun;
+ to->cpt_si_pid = from->si_pid;
+ to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else
to->si_errno = from->si_errno;
to->si_code = from->si_code;
- if (to->si_code < 0)
+ if (to->si_code == SI_TIMER)
{
+ to->si_timerid = from->cpt_si_timerid;
+ to->si_overrun = from->cpt_si_overrun;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else if (to->si_code == SI_USER)
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
}
- else if (to->si_code == SI_TIMER)
+ if (to->si_code < 0)
{
- to->si_timerid = from->cpt_si_timerid;
- to->si_overrun = from->cpt_si_overrun;
+ to->si_pid = from->cpt_si_pid;
+ to->si_uid = from->cpt_si_uid;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else
INF. */
static int
-amd64_linux_siginfo_fixup (struct siginfo *native, gdb_byte *inf, int direction)
+amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
{
/* Is the inferior 32-bit? If so, then do fixup the siginfo
object. */
if (gdbarch_addr_bit (get_frame_arch (get_current_frame ())) == 32)
{
- gdb_assert (sizeof (struct siginfo) == sizeof (compat_siginfo_t));
+ gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t));
if (direction == 0)
compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
return 0;
}
+/* Get Linux/x86 target description from running target.
+
+ Value of CS segment register:
+ 1. 64bit process: 0x33.
+ 2. 32bit process: 0x23.
+ */
+
+#define AMD64_LINUX_USER64_CS 0x33
+
+static const struct target_desc *
+amd64_linux_read_description (struct target_ops *ops)
+{
+ unsigned long cs;
+ int tid;
+ int is_64bit;
+ static uint64_t xcr0;
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+ /* Get CS register. */
+ errno = 0;
+ cs = ptrace (PTRACE_PEEKUSER, tid,
+ offsetof (struct user_regs_struct, cs), 0);
+ if (errno != 0)
+ perror_with_name (_("Couldn't get CS register"));
+
+ is_64bit = cs == AMD64_LINUX_USER64_CS;
+
+ if (have_ptrace_getregset == -1)
+ {
+ uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))];
+ struct iovec iov;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof (xstateregs);
+
+ /* Check if PTRACE_GETREGSET works. */
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ have_ptrace_getregset = 0;
+ else
+ {
+ have_ptrace_getregset = 1;
+
+ /* Get XCR0 from XSAVE extended state. */
+ xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
+ / sizeof (uint64_t))];
+ }
+ }
+
+ /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
+ if (have_ptrace_getregset
+ && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
+ {
+ if (is_64bit)
+ return tdesc_amd64_avx_linux;
+ else
+ return tdesc_i386_avx_linux;
+ }
+ else
+ {
+ if (is_64bit)
+ return tdesc_amd64_linux;
+ else
+ return tdesc_i386_linux;
+ }
+}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64_linux_nat (void);
amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
- amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset;
+ amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset;
amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
== amd64_native_gregset32_num_regs);
- gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset)
- == amd64_native_gregset64_num_regs);
/* Fill in the generic GNU/Linux methods. */
t = linux_target ();
i386_dr_low.set_control = amd64_linux_dr_set_control;
i386_dr_low.set_addr = amd64_linux_dr_set_addr;
- i386_dr_low.reset_addr = amd64_linux_dr_reset_addr;
+ i386_dr_low.get_addr = amd64_linux_dr_get_addr;
i386_dr_low.get_status = amd64_linux_dr_get_status;
+ i386_dr_low.get_control = amd64_linux_dr_get_control;
i386_set_debug_register_length (8);
/* Override the GNU/Linux inferior startup hook. */
t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
t->to_store_registers = amd64_linux_store_inferior_registers;
+ t->to_read_description = amd64_linux_read_description;
+
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, amd64_linux_new_thread);
linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup);
+ linux_nat_set_prepare_to_resume (t, amd64_linux_prepare_to_resume);
}
projects / deliverable / binutils-gdb.git / blobdiff