/* Native-dependent code for GNU/Linux i386.
- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1999-2014 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "i386-nat.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "regset.h"
#include "target.h"
#include "linux-nat.h"
+#include "linux-btrace.h"
+#include "btrace.h"
#include "gdb_assert.h"
-#include "gdb_string.h"
+#include <string.h>
+#include "elf/common.h"
+#include <sys/uio.h>
#include <sys/ptrace.h>
#include <sys/user.h>
#include <sys/procfs.h>
#include <sys/debugreg.h>
#endif
-#ifndef DR_FIRSTADDR
-#define DR_FIRSTADDR 0
-#endif
-
-#ifndef DR_LASTADDR
-#define DR_LASTADDR 3
-#endif
-
-#ifndef DR_STATUS
-#define DR_STATUS 6
-#endif
-
-#ifndef DR_CONTROL
-#define DR_CONTROL 7
-#endif
-
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* Defines ps_err_e, struct ps_prochandle. */
#include "gdb_proc_service.h"
+
+#include "i386-xstate.h"
+
+#ifndef PTRACE_GETREGSET
+#define PTRACE_GETREGSET 0x4204
+#endif
+
+#ifndef PTRACE_SETREGSET
+#define PTRACE_SETREGSET 0x4205
+#endif
+
+/* 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;
+};
+
+/* Does the current host support PTRACE_GETREGSET? */
+static int have_ptrace_getregset = -1;
\f
/* The register sets used in GNU/Linux ELF core-dumps are identical to
those names are now used for the register sets used in the
`mcontext_t' type, and have a different size and layout. */
-/* Mapping between the general-purpose registers in `struct user'
- format and GDB's register array layout. */
-static int regmap[] =
-{
- EAX, ECX, EDX, EBX,
- UESP, EBP, ESI, EDI,
- EIP, EFL, CS, SS,
- DS, ES, FS, GS,
- -1, -1, -1, -1, /* st0, st1, st2, st3 */
- -1, -1, -1, -1, /* st4, st5, st6, st7 */
- -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */
- -1, -1, -1, -1, /* fioff, foseg, fooff, fop */
- -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */
- -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */
- -1, /* mxcsr */
- ORIG_EAX
-};
-
/* Which ptrace request retrieves which registers?
These apply to the corresponding SET requests as well. */
#define GETFPXREGS_SUPPLIES(regno) \
(I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS)
+#define GETXSTATEREGS_SUPPLIES(regno) \
+ (I386_ST0_REGNUM <= (regno) && (regno) < I386_MPX_NUM_REGS)
+
/* Does the current host support the GETREGS request? */
int have_ptrace_getregs =
#ifdef HAVE_PTRACE_GETREGS
for this to be a simple variable. */
int have_ptrace_getfpxregs =
#ifdef HAVE_PTRACE_GETFPXREGS
- 1
+ -1
#else
0
#endif
int val;
gdb_assert (!have_ptrace_getregs);
- if (regmap[regno] == -1)
+ if (i386_linux_gregset_reg_offset[regno] == -1)
{
regcache_raw_supply (regcache, regno, NULL);
return;
}
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
errno = 0;
- val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0);
+ val = ptrace (PTRACE_PEEKUSER, tid,
+ i386_linux_gregset_reg_offset[regno], 0);
if (errno != 0)
error (_("Couldn't read register %s (#%d): %s."),
- gdbarch_register_name (current_gdbarch, regno),
+ gdbarch_register_name (get_regcache_arch (regcache), regno),
regno, safe_strerror (errno));
regcache_raw_supply (regcache, regno, &val);
}
-/* Store one register. */
+/* Store one register. */
static void
store_register (const struct regcache *regcache, int regno)
int val;
gdb_assert (!have_ptrace_getregs);
- if (regmap[regno] == -1)
+ if (i386_linux_gregset_reg_offset[regno] == -1)
return;
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
errno = 0;
regcache_raw_collect (regcache, regno, &val);
- ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val);
+ ptrace (PTRACE_POKEUSER, tid,
+ i386_linux_gregset_reg_offset[regno], val);
if (errno != 0)
error (_("Couldn't write register %s (#%d): %s."),
- gdbarch_register_name (current_gdbarch, regno),
+ gdbarch_register_name (get_regcache_arch (regcache), regno),
regno, safe_strerror (errno));
}
\f
void
supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
{
- const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
+ const gdb_byte *regp = (const gdb_byte *) gregsetp;
int i;
for (i = 0; i < I386_NUM_GREGS; i++)
- regcache_raw_supply (regcache, i, regp + regmap[i]);
+ regcache_raw_supply (regcache, i,
+ regp + i386_linux_gregset_reg_offset[i]);
- if (I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch))
- regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM,
- regp + ORIG_EAX);
+ if (I386_LINUX_ORIG_EAX_REGNUM
+ < gdbarch_num_regs (get_regcache_arch (regcache)))
+ regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp
+ + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
}
/* Fill register REGNO (if it is a general-purpose register) in
fill_gregset (const struct regcache *regcache,
elf_gregset_t *gregsetp, int regno)
{
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ gdb_byte *regp = (gdb_byte *) gregsetp;
int i;
for (i = 0; i < I386_NUM_GREGS; i++)
if (regno == -1 || regno == i)
- regcache_raw_collect (regcache, i, regp + regmap[i]);
+ regcache_raw_collect (regcache, i,
+ regp + i386_linux_gregset_reg_offset[i]);
if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
- && I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch))
- regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM,
- regp + ORIG_EAX);
+ && I386_LINUX_ORIG_EAX_REGNUM
+ < gdbarch_num_regs (get_regcache_arch (regcache)))
+ regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp
+ + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
}
#ifdef HAVE_PTRACE_GETREGS
#else
-static void fetch_fpregs (struct regcache *regcache, int tid) {}
-static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
+static void
+fetch_fpregs (struct regcache *regcache, int tid)
+{
+}
+
+static void
+store_fpregs (const struct regcache *regcache, int tid, int regno)
+{
+}
#endif
\f
/* Transfering floating-point and SSE registers to and from GDB. */
-#ifdef HAVE_PTRACE_GETFPXREGS
-
-/* Fill GDB's register array with the floating-point and SSE register
- values in *FPXREGSETP. */
+/* Fetch all registers covered by the PTRACE_GETREGSET request from
+ process/thread TID and store their values in GDB's register array.
+ Return non-zero if successful, zero otherwise. */
-void
-supply_fpxregset (struct regcache *regcache,
- const elf_fpxregset_t *fpxregsetp)
+static int
+fetch_xstateregs (struct regcache *regcache, int tid)
{
- i387_supply_fxsave (regcache, -1, fpxregsetp);
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ if (!have_ptrace_getregset)
+ return 0;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof(xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ &iov) < 0)
+ perror_with_name (_("Couldn't read extended state status"));
+
+ i387_supply_xsave (regcache, -1, xstateregs);
+ return 1;
}
-/* Fill register REGNO (if it is a floating-point or SSE register) in
- *FPXREGSETP with the value in GDB's register array. If REGNO is
- -1, do this for all registers. */
+/* Store all valid registers in GDB's register array covered by the
+ PTRACE_SETREGSET request into the process/thread specified by TID.
+ Return non-zero if successful, zero otherwise. */
-void
-fill_fpxregset (const struct regcache *regcache,
- elf_fpxregset_t *fpxregsetp, int regno)
+static int
+store_xstateregs (const struct regcache *regcache, int tid, int regno)
{
- i387_collect_fxsave (regcache, regno, fpxregsetp);
+ char xstateregs[I386_XSTATE_MAX_SIZE];
+ struct iovec iov;
+
+ if (!have_ptrace_getregset)
+ return 0;
+
+ iov.iov_base = xstateregs;
+ iov.iov_len = sizeof(xstateregs);
+ if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ &iov) < 0)
+ perror_with_name (_("Couldn't read extended state status"));
+
+ i387_collect_xsave (regcache, regno, xstateregs, 0);
+
+ if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE,
+ (int) &iov) < 0)
+ perror_with_name (_("Couldn't write extended state status"));
+
+ return 1;
}
+#ifdef HAVE_PTRACE_GETFPXREGS
+
/* Fetch all registers covered by the PTRACE_GETFPXREGS request from
process/thread TID and store their values in GDB's register array.
Return non-zero if successful, zero otherwise. */
perror_with_name (_("Couldn't read floating-point and SSE registers"));
}
- supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs);
+ i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs);
return 1;
}
perror_with_name (_("Couldn't read floating-point and SSE registers"));
}
- fill_fpxregset (regcache, &fpxregs, regno);
+ i387_collect_fxsave (regcache, regno, &fpxregs);
if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1)
perror_with_name (_("Couldn't write floating-point and SSE registers"));
#else
-static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; }
-static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; }
+static int
+fetch_fpxregs (struct regcache *regcache, int tid)
+{
+ return 0;
+}
+
+static int
+store_fpxregs (const struct regcache *regcache, int tid, int regno)
+{
+ return 0;
+}
#endif /* HAVE_PTRACE_GETFPXREGS */
\f
registers). */
static void
-i386_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
+i386_linux_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
int tid;
{
int i;
- for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++)
+ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
if (regno == -1 || regno == i)
fetch_register (regcache, i);
}
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
/* Use the PTRACE_GETFPXREGS request whenever possible, since it
transfers more registers in one system call, and we'll cache the
/* The call above might reset `have_ptrace_getregs'. */
if (!have_ptrace_getregs)
{
- i386_linux_fetch_inferior_registers (regcache, regno);
+ i386_linux_fetch_inferior_registers (ops, regcache, regno);
return;
}
+ if (fetch_xstateregs (regcache, tid))
+ return;
if (fetch_fpxregs (regcache, tid))
return;
fetch_fpregs (regcache, tid);
return;
}
+ if (GETXSTATEREGS_SUPPLIES (regno))
+ {
+ if (fetch_xstateregs (regcache, tid))
+ return;
+ }
+
if (GETFPXREGS_SUPPLIES (regno))
{
if (fetch_fpxregs (regcache, tid))
do this for all registers (including the floating point and SSE
registers). */
static void
-i386_linux_store_inferior_registers (struct regcache *regcache, int regno)
+i386_linux_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
int tid;
{
int i;
- for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++)
+ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
if (regno == -1 || regno == i)
store_register (regcache, i);
}
/* GNU/Linux LWP ID's are process ID's. */
- tid = TIDGET (inferior_ptid);
+ tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
- tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
/* Use the PTRACE_SETFPXREGS requests whenever possible, since it
transfers more registers in one system call. But remember that
if (regno == -1)
{
store_regs (regcache, tid, regno);
+ if (store_xstateregs (regcache, tid, regno))
+ return;
if (store_fpxregs (regcache, tid, regno))
return;
store_fpregs (regcache, tid, regno);
return;
}
+ if (GETXSTATEREGS_SUPPLIES (regno))
+ {
+ if (store_xstateregs (regcache, tid, regno))
+ return;
+ }
+
if (GETFPXREGS_SUPPLIES (regno))
{
if (store_fpxregs (regcache, tid, regno))
/* Support for debug registers. */
-static unsigned long i386_linux_dr[DR_CONTROL + 1];
+/* Get debug register REGNUM value from only the one LWP of PTID. */
static unsigned long
i386_linux_dr_get (ptid_t ptid, int regnum)
int tid;
unsigned long value;
- tid = TIDGET (ptid);
+ tid = ptid_get_lwp (ptid);
if (tid == 0)
- tid = PIDGET (ptid);
+ tid = ptid_get_pid (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
i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
int tid;
- tid = TIDGET (ptid);
+ tid = ptid_get_lwp (ptid);
if (tid == 0)
- tid = PIDGET (ptid);
+ tid = ptid_get_pid (ptid);
errno = 0;
ptrace (PTRACE_POKEUSER, tid,
perror_with_name (_("Couldn't write debug register"));
}
-void
+/* Return the inferior's debug register REGNUM. */
+
+static CORE_ADDR
+i386_linux_dr_get_addr (int regnum)
+{
+ /* DR6 and DR7 are retrieved with some other way. */
+ gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
+
+ return i386_linux_dr_get (inferior_ptid, regnum);
+}
+
+/* Return the inferior's DR7 debug control register. */
+
+static unsigned long
+i386_linux_dr_get_control (void)
+{
+ return i386_linux_dr_get (inferior_ptid, DR_CONTROL);
+}
+
+/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
+
+static unsigned long
+i386_linux_dr_get_status (void)
+{
+ return i386_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 ADDR in all LWPs of the current inferior. */
+
+static void
i386_linux_dr_set_control (unsigned long control)
{
- struct lwp_info *lp;
- ptid_t ptid;
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
- i386_linux_dr[DR_CONTROL] = control;
- ALL_LWPS (lp, ptid)
- i386_linux_dr_set (ptid, DR_CONTROL, control);
+ iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
}
-void
+/* Set address REGNUM (zero based) to ADDR in all LWPs of the current
+ inferior. */
+
+static void
i386_linux_dr_set_addr (int regnum, CORE_ADDR addr)
{
- struct lwp_info *lp;
- ptid_t ptid;
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- i386_linux_dr[DR_FIRSTADDR + regnum] = addr;
- ALL_LWPS (lp, ptid)
- i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
+ iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
}
-void
-i386_linux_dr_reset_addr (int regnum)
+/* Called when resuming a thread.
+ If the debug regs have changed, update the thread's copies. */
+
+static void
+i386_linux_prepare_to_resume (struct lwp_info *lwp)
{
- i386_linux_dr_set_addr (regnum, 0);
+ 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;
+
+ /* See amd64_linux_prepare_to_resume for Linux kernel note on
+ i386_linux_dr_set calls ordering. */
+
+ for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+ if (state->dr_ref_count[i] > 0)
+ {
+ i386_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;
+ }
+
+ i386_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)
+ i386_linux_dr_set (lwp->ptid, DR_STATUS, 0);
}
-unsigned long
-i386_linux_dr_get_status (void)
+static void
+i386_linux_new_thread (struct lwp_info *lp)
{
- return i386_linux_dr_get (inferior_ptid, DR_STATUS);
+ struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
+
+ info->debug_registers_changed = 1;
+
+ lp->arch_private = info;
}
+/* linux_nat_new_fork hook. */
+
static void
-i386_linux_new_thread (ptid_t ptid)
+i386_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
{
- int i;
+ pid_t parent_pid;
+ struct i386_debug_reg_state *parent_state;
+ struct i386_debug_reg_state *child_state;
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
- i386_linux_dr_set (ptid, i, i386_linux_dr[i]);
+ /* NULL means no watchpoint has ever been set in the parent. In
+ that case, there's nothing to do. */
+ if (parent->arch_private == NULL)
+ return;
- i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]);
+ /* 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.
+
+ 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. */
+
+ parent_pid = ptid_get_pid (parent->ptid);
+ parent_state = i386_debug_reg_state (parent_pid);
+ child_state = i386_debug_reg_state (child_pid);
+ *child_state = *parent_state;
}
+
\f
/* Called by libthread_db. Returns a pointer to the thread local
call.
Is this function needed? I'm guessing that the `base' is the
- address of a a descriptor that libthread_db uses to find the
+ address of a descriptor that libthread_db uses to find the
thread local address base that GDB needs. Perhaps that
descriptor is defined by the ABI. Anyway, given that
libthread_db calls this function without prompting (gdb
If SIGNAL is nonzero, give it that signal. */
static void
-i386_linux_resume (ptid_t ptid, int step, enum target_signal signal)
+i386_linux_resume (struct target_ops *ops,
+ ptid_t ptid, int step, enum gdb_signal signal)
{
- int pid = PIDGET (ptid);
+ int pid = ptid_get_pid (ptid);
- int request = PTRACE_CONT;
+ int request;
+
+ if (catch_syscall_enabled () > 0)
+ request = PTRACE_SYSCALL;
+ else
+ request = PTRACE_CONT;
if (step)
{
struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid));
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
ULONGEST pc;
gdb_byte buf[LINUX_SYSCALL_LEN];
request = PTRACE_SINGLESTEP;
regcache_cooked_read_unsigned (regcache,
- gdbarch_pc_regnum (current_gdbarch), &pc);
+ gdbarch_pc_regnum (gdbarch), &pc);
/* Returning from a signal trampoline is done by calling a
special system call (sigreturn or rt_sigreturn, see
that's about to be restored, and set the trace flag there. */
/* First check if PC is at a system call. */
- if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0
+ if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0
&& memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0)
{
ULONGEST syscall;
regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp);
if (syscall == SYS_rt_sigreturn)
- addr = read_memory_integer (sp + 8, 4) + 20;
+ addr = read_memory_unsigned_integer (sp + 8, 4, byte_order)
+ + 20;
else
addr = sp;
}
}
- if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
+ if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1)
perror_with_name (("ptrace"));
}
super_post_startup_inferior (ptid);
}
+/* Get Linux/x86 target description from running target. */
+
+static const struct target_desc *
+i386_linux_read_description (struct target_ops *ops)
+{
+ int tid;
+ static uint64_t xcr0;
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */
+
+#ifdef HAVE_PTRACE_GETFPXREGS
+ if (have_ptrace_getfpxregs == -1)
+ {
+ elf_fpxregset_t fpxregs;
+
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0)
+ {
+ have_ptrace_getfpxregs = 0;
+ have_ptrace_getregset = 0;
+ return tdesc_i386_mmx_linux;
+ }
+ }
+#endif
+
+ 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,
+ &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 (long long))];
+ }
+ }
+
+ /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
+ if (have_ptrace_getregset)
+ {
+ switch ((xcr0 & I386_XSTATE_ALL_MASK))
+ {
+ case I386_XSTATE_MPX_MASK:
+ return tdesc_i386_mpx_linux;
+ case I386_XSTATE_AVX_MASK:
+ return tdesc_i386_avx_linux;
+ default:
+ return tdesc_i386_linux;
+ }
+ }
+ else
+ return tdesc_i386_linux;
+}
+
+/* Enable branch tracing. */
+
+static struct btrace_target_info *
+i386_linux_enable_btrace (ptid_t ptid)
+{
+ struct btrace_target_info *tinfo;
+ struct gdbarch *gdbarch;
+
+ errno = 0;
+ tinfo = linux_enable_btrace (ptid);
+
+ 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;
+}
+
+/* Disable branch tracing. */
+
+static void
+i386_linux_disable_btrace (struct btrace_target_info *tinfo)
+{
+ int errcode = linux_disable_btrace (tinfo);
+
+ if (errcode != 0)
+ error (_("Could not disable branch tracing: %s."), safe_strerror (errcode));
+}
+
+/* Teardown branch tracing. */
+
+static void
+i386_linux_teardown_btrace (struct btrace_target_info *tinfo)
+{
+ /* Ignore errors. */
+ linux_disable_btrace (tinfo);
+}
+
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_i386_linux_nat;
+
void
_initialize_i386_linux_nat (void)
{
/* Fill in the generic GNU/Linux methods. */
t = linux_target ();
+ i386_use_watchpoints (t);
+
+ i386_dr_low.set_control = i386_linux_dr_set_control;
+ i386_dr_low.set_addr = i386_linux_dr_set_addr;
+ i386_dr_low.get_addr = i386_linux_dr_get_addr;
+ i386_dr_low.get_status = i386_linux_dr_get_status;
+ i386_dr_low.get_control = i386_linux_dr_get_control;
+ i386_set_debug_register_length (4);
+
/* Override the default ptrace resume method. */
t->to_resume = i386_linux_resume;
t->to_fetch_registers = i386_linux_fetch_inferior_registers;
t->to_store_registers = i386_linux_store_inferior_registers;
+ t->to_read_description = i386_linux_read_description;
+
+ /* Add btrace methods. */
+ t->to_supports_btrace = linux_supports_btrace;
+ t->to_enable_btrace = i386_linux_enable_btrace;
+ t->to_disable_btrace = i386_linux_disable_btrace;
+ t->to_teardown_btrace = i386_linux_teardown_btrace;
+ t->to_read_btrace = linux_read_btrace;
+
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, i386_linux_new_thread);
+ linux_nat_set_new_fork (t, i386_linux_new_fork);
+ linux_nat_set_forget_process (t, i386_forget_process);
+ linux_nat_set_prepare_to_resume (t, i386_linux_prepare_to_resume);
}