/* GNU/Linux/x86-64 specific low level interface, for the remote server
for GDB.
- Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
+ Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include <stddef.h>
+#include "server.h"
#include <signal.h>
#include <limits.h>
#include <inttypes.h>
-#include "server.h"
#include "linux-low.h"
#include "i387-fp.h"
-#include "i386-low.h"
-#include "i386-xstate.h"
-#include "elf/common.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
+ gdb_proc_service.h. */
+#ifndef ELFMAG0
+#include "elf/common.h"
+#endif
+
#include "agent.h"
+#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"
-/* Defined in auto-generated file i386-linux.c. */
-void init_registers_i386_linux (void);
+#ifdef __x86_64__
/* Defined in auto-generated file amd64-linux.c. */
void init_registers_amd64_linux (void);
-/* Defined in auto-generated file i386-avx-linux.c. */
-void init_registers_i386_avx_linux (void);
+extern const struct target_desc *tdesc_amd64_linux;
+
/* Defined in auto-generated file amd64-avx-linux.c. */
void init_registers_amd64_avx_linux (void);
+extern const struct target_desc *tdesc_amd64_avx_linux;
+
+/* Defined in auto-generated file amd64-avx512-linux.c. */
+void init_registers_amd64_avx512_linux (void);
+extern const struct target_desc *tdesc_amd64_avx512_linux;
+
+/* Defined in auto-generated file amd64-mpx-linux.c. */
+void init_registers_amd64_mpx_linux (void);
+extern const struct target_desc *tdesc_amd64_mpx_linux;
+
+/* Defined in auto-generated file x32-linux.c. */
+void init_registers_x32_linux (void);
+extern const struct target_desc *tdesc_x32_linux;
+
+/* Defined in auto-generated file x32-avx-linux.c. */
+void init_registers_x32_avx_linux (void);
+extern const struct target_desc *tdesc_x32_avx_linux;
+
+/* Defined in auto-generated file x32-avx512-linux.c. */
+void init_registers_x32_avx512_linux (void);
+extern const struct target_desc *tdesc_x32_avx512_linux;
+
+#endif
+
+/* Defined in auto-generated file i386-linux.c. */
+void init_registers_i386_linux (void);
+extern const struct target_desc *tdesc_i386_linux;
+
/* Defined in auto-generated file i386-mmx-linux.c. */
void init_registers_i386_mmx_linux (void);
+extern const struct target_desc *tdesc_i386_mmx_linux;
+
+/* Defined in auto-generated file i386-avx-linux.c. */
+void init_registers_i386_avx_linux (void);
+extern const struct target_desc *tdesc_i386_avx_linux;
+
+/* Defined in auto-generated file i386-avx512-linux.c. */
+void init_registers_i386_avx512_linux (void);
+extern const struct target_desc *tdesc_i386_avx512_linux;
+
+/* Defined in auto-generated file i386-mpx-linux.c. */
+void init_registers_i386_mpx_linux (void);
+extern const struct target_desc *tdesc_i386_mpx_linux;
+
+#ifdef __x86_64__
+static struct target_desc *tdesc_amd64_linux_no_xml;
+#endif
+static struct target_desc *tdesc_i386_linux_no_xml;
+
static unsigned char jump_insn[] = { 0xe9, 0, 0, 0, 0 };
static unsigned char small_jump_insn[] = { 0x66, 0xe9, 0, 0 };
#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 arch_process_info
{
- struct i386_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;
+ struct x86_debug_reg_state debug_reg_state;
};
#ifdef __x86_64__
/* So code below doesn't have to care, i386 or amd64. */
#define ORIG_EAX ORIG_RAX
+#define REGSIZE 8
static const int x86_64_regmap[] =
{
-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
+ -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ ORIG_RAX * 8,
+ -1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
+ -1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* xmm16 ... xmm31 (AVX512) */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, /* ymm16 ... ymm31 (AVX512) */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm31 (AVX512) */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1
};
#define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0]))
+#define X86_64_USER_REGS (GS + 1)
#else /* ! __x86_64__ */
#define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0]))
+#define REGSIZE 4
+
+#endif
+
+#ifdef __x86_64__
+
+/* Returns true if the current inferior belongs to a x86-64 process,
+ per the tdesc. */
+
+static int
+is_64bit_tdesc (void)
+{
+ struct regcache *regcache = get_thread_regcache (current_thread, 0);
+
+ return register_size (regcache->tdesc, 0) == 8;
+}
+
#endif
+
\f
/* Called by libthread_db. */
lwpid_t lwpid, int idx, void **base)
{
#ifdef __x86_64__
- int use_64bit = register_size (0) == 8;
+ int use_64bit = is_64bit_tdesc ();
if (use_64bit)
{
(void *) (intptr_t) idx, (unsigned long) &desc) < 0)
return PS_ERR;
- *(int *)base = desc[1];
+ /* Ensure we properly extend the value to 64-bits for x86_64. */
+ *base = (void *) (uintptr_t) desc[1];
return PS_OK;
}
}
x86_get_thread_area (int lwpid, CORE_ADDR *addr)
{
#ifdef __x86_64__
- int use_64bit = register_size (0) == 8;
+ int use_64bit = is_64bit_tdesc ();
if (use_64bit)
{
{
struct lwp_info *lwp = find_lwp_pid (pid_to_ptid (lwpid));
- struct regcache *regcache = get_thread_regcache (get_lwp_thread (lwp), 1);
+ struct thread_info *thr = get_lwp_thread (lwp);
+ struct regcache *regcache = get_thread_regcache (thr, 1);
unsigned int desc[4];
ULONGEST gs = 0;
const int reg_thread_area = 3; /* bits to scale down register value. */
idx = gs >> reg_thread_area;
if (ptrace (PTRACE_GET_THREAD_AREA,
- lwpid_of (lwp),
+ lwpid_of (thr),
(void *) (long) idx, (unsigned long) &desc) < 0)
return -1;
\f
static int
-i386_cannot_store_register (int regno)
+x86_cannot_store_register (int regno)
{
+#ifdef __x86_64__
+ if (is_64bit_tdesc ())
+ return 0;
+#endif
+
return regno >= I386_NUM_REGS;
}
static int
-i386_cannot_fetch_register (int regno)
+x86_cannot_fetch_register (int regno)
{
+#ifdef __x86_64__
+ if (is_64bit_tdesc ())
+ return 0;
+#endif
+
return regno >= I386_NUM_REGS;
}
int i;
#ifdef __x86_64__
- if (register_size (0) == 8)
+ if (register_size (regcache->tdesc, 0) == 8)
{
for (i = 0; i < X86_64_NUM_REGS; i++)
if (x86_64_regmap[i] != -1)
collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
return;
}
+
+ /* 32-bit inferior registers need to be zero-extended.
+ Callers would read uninitialized memory otherwise. */
+ memset (buf, 0x00, X86_64_USER_REGS * 8);
#endif
for (i = 0; i < I386_NUM_REGS; i++)
collect_register (regcache, i, ((char *) buf) + i386_regmap[i]);
collect_register_by_name (regcache, "orig_eax",
- ((char *) buf) + ORIG_EAX * 4);
+ ((char *) buf) + ORIG_EAX * REGSIZE);
}
static void
int i;
#ifdef __x86_64__
- if (register_size (0) == 8)
+ if (register_size (regcache->tdesc, 0) == 8)
{
for (i = 0; i < X86_64_NUM_REGS; i++)
if (x86_64_regmap[i] != -1)
supply_register (regcache, i, ((char *) buf) + i386_regmap[i]);
supply_register_by_name (regcache, "orig_eax",
- ((char *) buf) + ORIG_EAX * 4);
+ ((char *) buf) + ORIG_EAX * REGSIZE);
}
static void
This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS
doesn't work. IWBN to avoid the duplication in the case where it
does work. Maybe the arch_setup routine could check whether it works
- and update target_regsets accordingly, maybe by moving target_regsets
- to linux_target_ops and set the right one there, rather than having to
- modify the target_regsets global. */
+ and update the supported regsets accordingly. */
-struct regset_info target_regsets[] =
+static struct regset_info x86_regsets[] =
{
#ifdef HAVE_PTRACE_GETREGS
{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
FP_REGS,
x86_fill_fpregset, x86_store_fpregset },
#endif /* HAVE_PTRACE_GETREGS */
- { 0, 0, 0, -1, -1, NULL, NULL }
+ NULL_REGSET
};
static CORE_ADDR
x86_get_pc (struct regcache *regcache)
{
- int use_64bit = register_size (0) == 8;
+ int use_64bit = register_size (regcache->tdesc, 0) == 8;
if (use_64bit)
{
static void
x86_set_pc (struct regcache *regcache, CORE_ADDR pc)
{
- int use_64bit = register_size (0) == 8;
+ int use_64bit = register_size (regcache->tdesc, 0) == 8;
if (use_64bit)
{
}
}
\f
-static const unsigned char x86_breakpoint[] = { 0xCC };
+static const gdb_byte x86_breakpoint[] = { 0xCC };
#define x86_breakpoint_len 1
static int
return 0;
}
\f
-/* 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,
- offsetof (struct user, u_debugreg[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,
- offsetof (struct user, u_debugreg[regnum]), value);
- if (errno != 0)
- error ("Couldn't write debug register");
-}
+/* Low-level function vector. */
+struct x86_dr_low_type x86_dr_low =
+ {
+ 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
+/* Breakpoint/Watchpoint support. */
static int
-update_debug_registers_callback (struct inferior_list_entry *entry,
- void *pid_p)
+x86_supports_z_point_type (char z_type)
{
- struct lwp_info *lwp = (struct lwp_info *) entry;
- int pid = *(int *) pid_p;
-
- /* Only update the threads of this process. */
- if (pid_of (lwp) == pid)
+ switch (z_type)
{
- /* 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);
+ case Z_PACKET_SW_BP:
+ case Z_PACKET_HW_BP:
+ case Z_PACKET_WRITE_WP:
+ case Z_PACKET_ACCESS_WP:
+ return 1;
+ default:
+ return 0;
}
-
- return 0;
-}
-
-/* Update the inferior's debug register REGNUM from STATE. */
-
-void
-i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum)
-{
- /* Only update the threads of this process. */
- int pid = pid_of (get_thread_lwp (current_inferior));
-
- if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR))
- fatal ("Invalid debug register %d", regnum);
-
- find_inferior (&all_lwps, update_debug_registers_callback, &pid);
-}
-
-/* Return the inferior's debug register REGNUM. */
-
-CORE_ADDR
-i386_dr_low_get_addr (int regnum)
-{
- struct lwp_info *lwp = get_thread_lwp (current_inferior);
- ptid_t ptid = ptid_of (lwp);
-
- /* DR6 and DR7 are retrieved with some other way. */
- 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. */
-
-void
-i386_dr_low_set_control (const struct i386_debug_reg_state *state)
-{
- /* Only update the threads of this process. */
- int pid = pid_of (get_thread_lwp (current_inferior));
-
- find_inferior (&all_lwps, update_debug_registers_callback, &pid);
}
-/* Return the inferior's DR7 debug control register. */
-
-unsigned
-i386_dr_low_get_control (void)
-{
- struct lwp_info *lwp = get_thread_lwp (current_inferior);
- ptid_t ptid = ptid_of (lwp);
-
- 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. */
-
-unsigned
-i386_dr_low_get_status (void)
-{
- struct lwp_info *lwp = get_thread_lwp (current_inferior);
- ptid_t ptid = ptid_of (lwp);
-
- return x86_linux_dr_get (ptid, DR_STATUS);
-}
-\f
-/* Breakpoint/Watchpoint support. */
-
static int
-x86_insert_point (char type, CORE_ADDR addr, int len)
+x86_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
{
struct process_info *proc = current_process ();
+
switch (type)
{
- case '0':
+ case raw_bkpt_type_hw:
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_access_wp:
{
- int ret;
-
- ret = prepare_to_access_memory ();
- if (ret)
- return -1;
- ret = set_gdb_breakpoint_at (addr);
- done_accessing_memory ();
- return ret;
+ enum target_hw_bp_type hw_type
+ = raw_bkpt_type_to_target_hw_bp_type (type);
+ struct x86_debug_reg_state *state
+ = &proc->priv->arch_private->debug_reg_state;
+
+ return x86_dr_insert_watchpoint (state, hw_type, addr, size);
}
- case '2':
- case '3':
- case '4':
- return i386_low_insert_watchpoint (&proc->private->arch_private->debug_reg_state,
- type, addr, len);
+
default:
/* Unsupported. */
return 1;
}
static int
-x86_remove_point (char type, CORE_ADDR addr, int len)
+x86_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int size, struct raw_breakpoint *bp)
{
struct process_info *proc = current_process ();
+
switch (type)
{
- case '0':
+ case raw_bkpt_type_hw:
+ case raw_bkpt_type_write_wp:
+ case raw_bkpt_type_access_wp:
{
- int ret;
-
- ret = prepare_to_access_memory ();
- if (ret)
- return -1;
- ret = delete_gdb_breakpoint_at (addr);
- done_accessing_memory ();
- return ret;
+ enum target_hw_bp_type hw_type
+ = raw_bkpt_type_to_target_hw_bp_type (type);
+ struct x86_debug_reg_state *state
+ = &proc->priv->arch_private->debug_reg_state;
+
+ return x86_dr_remove_watchpoint (state, hw_type, addr, size);
}
- case '2':
- case '3':
- case '4':
- return i386_low_remove_watchpoint (&proc->private->arch_private->debug_reg_state,
- type, addr, len);
default:
/* Unsupported. */
return 1;
x86_stopped_by_watchpoint (void)
{
struct process_info *proc = current_process ();
- return i386_low_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state);
+ return x86_dr_stopped_by_watchpoint (&proc->priv->arch_private->debug_reg_state);
}
static CORE_ADDR
{
struct process_info *proc = current_process ();
CORE_ADDR addr;
- if (i386_low_stopped_data_address (&proc->private->arch_private->debug_reg_state,
- &addr))
+ if (x86_dr_stopped_data_address (&proc->priv->arch_private->debug_reg_state,
+ &addr))
return addr;
return 0;
}
static struct arch_process_info *
x86_linux_new_process (void)
{
- struct arch_process_info *info = xcalloc (1, sizeof (*info));
-
- i386_low_init_dregs (&info->debug_reg_state);
-
- return info;
-}
-
-/* Called when a new thread is detected. */
-
-static struct arch_lwp_info *
-x86_linux_new_thread (void)
-{
- struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
+ struct arch_process_info *info = XCNEW (struct arch_process_info);
- info->debug_registers_changed = 1;
+ x86_low_init_dregs (&info->debug_reg_state);
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 (lwp);
- int clear_status = 0;
+ /* 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);
- if (lwp->arch_private->debug_registers_changed)
- {
- int i;
- int pid = ptid_get_pid (ptid);
- struct process_info *proc = find_process_pid (pid);
- struct i386_debug_reg_state *state
- = &proc->private->arch_private->debug_reg_state;
+ /* 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.
- for (i = DR_FIRSTADDR; i <= DR_LASTADDR; 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, i386_low_stopped_data_address can
- get confused. */
- clear_status = 1;
- }
+ *child->priv->arch_private = *parent->priv->arch_private;
+}
- 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->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
} _sifields;
} compat_siginfo_t;
+/* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
+typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t;
+
+typedef struct compat_x32_siginfo
+{
+ int si_signo;
+ int si_errno;
+ int si_code;
+
+ union
+ {
+ int _pad[((128 / sizeof (int)) - 3)];
+
+ /* kill() */
+ struct
+ {
+ unsigned int _pid;
+ unsigned int _uid;
+ } _kill;
+
+ /* POSIX.1b timers */
+ struct
+ {
+ compat_timer_t _tid;
+ int _overrun;
+ compat_sigval_t _sigval;
+ } _timer;
+
+ /* POSIX.1b signals */
+ struct
+ {
+ unsigned int _pid;
+ unsigned int _uid;
+ compat_sigval_t _sigval;
+ } _rt;
+
+ /* SIGCHLD */
+ struct
+ {
+ unsigned int _pid;
+ unsigned int _uid;
+ int _status;
+ compat_x32_clock_t _utime;
+ compat_x32_clock_t _stime;
+ } _sigchld;
+
+ /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
+ struct
+ {
+ unsigned int _addr;
+ } _sigfault;
+
+ /* SIGPOLL */
+ struct
+ {
+ int _band;
+ int _fd;
+ } _sigpoll;
+ } _sifields;
+} compat_x32_siginfo_t __attribute__ ((__aligned__ (8)));
+
#define cpt_si_pid _sifields._kill._pid
#define cpt_si_uid _sifields._kill._uid
#define cpt_si_timerid _sifields._timer._tid
}
}
+static void
+compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to,
+ siginfo_t *from)
+{
+ memset (to, 0, sizeof (*to));
+
+ to->si_signo = from->si_signo;
+ to->si_errno = from->si_errno;
+ to->si_code = from->si_code;
+
+ 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 < 0)
+ {
+ to->cpt_si_pid = from->si_pid;
+ to->cpt_si_uid = from->si_uid;
+ to->cpt_si_ptr = (intptr_t) from->si_ptr;
+ }
+ else
+ {
+ switch (to->si_signo)
+ {
+ case SIGCHLD:
+ to->cpt_si_pid = from->si_pid;
+ to->cpt_si_uid = from->si_uid;
+ to->cpt_si_status = from->si_status;
+ to->cpt_si_utime = from->si_utime;
+ to->cpt_si_stime = from->si_stime;
+ break;
+ case SIGILL:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGBUS:
+ to->cpt_si_addr = (intptr_t) from->si_addr;
+ break;
+ case SIGPOLL:
+ to->cpt_si_band = from->si_band;
+ to->cpt_si_fd = from->si_fd;
+ break;
+ default:
+ to->cpt_si_pid = from->si_pid;
+ to->cpt_si_uid = from->si_uid;
+ to->cpt_si_ptr = (intptr_t) from->si_ptr;
+ break;
+ }
+ }
+}
+
+static void
+siginfo_from_compat_x32_siginfo (siginfo_t *to,
+ compat_x32_siginfo_t *from)
+{
+ memset (to, 0, sizeof (*to));
+
+ to->si_signo = from->si_signo;
+ to->si_errno = from->si_errno;
+ to->si_code = from->si_code;
+
+ 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 < 0)
+ {
+ 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
+ {
+ switch (to->si_signo)
+ {
+ case SIGCHLD:
+ to->si_pid = from->cpt_si_pid;
+ to->si_uid = from->cpt_si_uid;
+ to->si_status = from->cpt_si_status;
+ to->si_utime = from->cpt_si_utime;
+ to->si_stime = from->cpt_si_stime;
+ break;
+ case SIGILL:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGBUS:
+ to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
+ break;
+ case SIGPOLL:
+ to->si_band = from->cpt_si_band;
+ to->si_fd = from->cpt_si_fd;
+ break;
+ default:
+ to->si_pid = from->cpt_si_pid;
+ to->si_uid = from->cpt_si_uid;
+ to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
+ break;
+ }
+ }
+}
+
#endif /* __x86_64__ */
/* Convert a native/host siginfo object, into/from the siginfo in the
x86_siginfo_fixup (siginfo_t *native, void *inf, int direction)
{
#ifdef __x86_64__
+ unsigned int machine;
+ int tid = lwpid_of (current_thread);
+ int is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);
+
/* Is the inferior 32-bit? If so, then fixup the siginfo object. */
- if (register_size (0) == 4)
+ if (!is_64bit_tdesc ())
{
- if (sizeof (siginfo_t) != sizeof (compat_siginfo_t))
- fatal ("unexpected difference in siginfo");
+ gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t));
if (direction == 0)
compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
else
siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
+ return 1;
+ }
+ /* No fixup for native x32 GDB. */
+ else if (!is_elf64 && sizeof (void *) == 8)
+ {
+ gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t));
+
+ if (direction == 0)
+ compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf,
+ native);
+ else
+ siginfo_from_compat_x32_siginfo (native,
+ (struct compat_x32_siginfo *) inf);
+
return 1;
}
#endif
\f
static int use_xml;
-/* Update gdbserver_xmltarget. */
+/* Format of XSAVE extended state is:
+ struct
+ {
+ fxsave_bytes[0..463]
+ sw_usable_bytes[464..511]
+ xstate_hdr_bytes[512..575]
+ avx_bytes[576..831]
+ future_state etc
+ };
+
+ Same memory layout will be used for the coredump NT_X86_XSTATE
+ representing the XSAVE extended state registers.
+
+ The first 8 bytes of the sw_usable_bytes[464..467] is the OS enabled
+ extended state mask, which is the same as the extended control register
+ 0 (the XFEATURE_ENABLED_MASK register), XCR0. We can use this mask
+ together with the mask saved in the xstate_hdr_bytes to determine what
+ states the processor/OS supports and what state, used or initialized,
+ the process/thread is in. */
+#define I386_LINUX_XSAVE_XCR0_OFFSET 464
+
+/* Does the current host support the GETFPXREGS request? The header
+ file may or may not define it, and even if it is defined, the
+ kernel will return EIO if it's running on a pre-SSE processor. */
+int have_ptrace_getfpxregs =
+#ifdef HAVE_PTRACE_GETFPXREGS
+ -1
+#else
+ 0
+#endif
+;
+
+/* Get Linux/x86 target description from running target. */
-static void
-x86_linux_update_xmltarget (void)
+static const struct target_desc *
+x86_linux_read_description (void)
{
- int pid;
+ unsigned int machine;
+ int is_elf64;
+ int xcr0_features;
+ int tid;
+ static uint64_t xcr0;
struct regset_info *regset;
- static unsigned long long xcr0;
- static int have_ptrace_getregset = -1;
-#if !defined(__x86_64__) && defined(HAVE_PTRACE_GETFPXREGS)
- static int have_ptrace_getfpxregs = -1;
-#endif
- if (!current_inferior)
- return;
+ tid = lwpid_of (current_thread);
- /* Before changing the register cache internal layout or the target
- regsets, flush the contents of the current valid caches back to
- the threads. */
- regcache_invalidate ();
+ is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);
- pid = pid_of (get_thread_lwp (current_inferior));
-#ifdef __x86_64__
- if (num_xmm_registers == 8)
- init_registers_i386_linux ();
- else
- init_registers_amd64_linux ();
-#else
+ if (sizeof (void *) == 4)
{
-# ifdef HAVE_PTRACE_GETFPXREGS
- if (have_ptrace_getfpxregs == -1)
- {
- elf_fpxregset_t fpxregs;
+ if (is_elf64 > 0)
+ error (_("Can't debug 64-bit process with 32-bit GDBserver"));
+#ifndef __x86_64__
+ else if (machine == EM_X86_64)
+ error (_("Can't debug x86-64 process with 32-bit GDBserver"));
+#endif
+ }
- if (ptrace (PTRACE_GETFPXREGS, pid, 0, (int) &fpxregs) < 0)
- {
- have_ptrace_getfpxregs = 0;
- x86_xcr0 = I386_XSTATE_X87_MASK;
-
- /* Disable PTRACE_GETFPXREGS. */
- for (regset = target_regsets;
- regset->fill_function != NULL; regset++)
- if (regset->get_request == PTRACE_GETFPXREGS)
- {
- regset->size = 0;
- break;
- }
- }
- else
- have_ptrace_getfpxregs = 1;
- }
+#if !defined __x86_64__ && defined HAVE_PTRACE_GETFPXREGS
+ if (machine == EM_386 && have_ptrace_getfpxregs == -1)
+ {
+ elf_fpxregset_t fpxregs;
- if (!have_ptrace_getfpxregs)
+ if (ptrace (PTRACE_GETFPXREGS, tid, 0, (long) &fpxregs) < 0)
{
- init_registers_i386_mmx_linux ();
- return;
+ have_ptrace_getfpxregs = 0;
+ have_ptrace_getregset = 0;
+ return tdesc_i386_mmx_linux;
}
-# endif
- init_registers_i386_linux ();
+ else
+ have_ptrace_getfpxregs = 1;
}
#endif
if (!use_xml)
{
+ x86_xcr0 = X86_XSTATE_SSE_MASK;
+
/* Don't use XML. */
#ifdef __x86_64__
- if (num_xmm_registers == 8)
- gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
+ if (machine == EM_X86_64)
+ return tdesc_amd64_linux_no_xml;
else
- gdbserver_xmltarget = xmltarget_amd64_linux_no_xml;
-#else
- gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
#endif
-
- x86_xcr0 = I386_XSTATE_SSE_MASK;
-
- return;
+ return tdesc_i386_linux_no_xml;
}
- /* Check if XSAVE extended state is supported. */
if (have_ptrace_getregset == -1)
{
- unsigned long long xstateregs[I386_XSTATE_SSE_SIZE / sizeof (long long)];
+ uint64_t xstateregs[(X86_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, pid, (unsigned int) NT_X86_XSTATE,
- &iov) < 0)
+ if (ptrace (PTRACE_GETREGSET, tid,
+ (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
+ have_ptrace_getregset = 0;
+ else
{
- have_ptrace_getregset = 0;
- return;
+ have_ptrace_getregset = 1;
+
+ /* Get XCR0 from XSAVE extended state. */
+ xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
+ / sizeof (uint64_t))];
+
+ /* Use PTRACE_GETREGSET if it is available. */
+ for (regset = x86_regsets;
+ regset->fill_function != NULL; regset++)
+ if (regset->get_request == PTRACE_GETREGSET)
+ regset->size = X86_XSTATE_SIZE (xcr0);
+ else if (regset->type != GENERAL_REGS)
+ regset->size = 0;
}
- else
- have_ptrace_getregset = 1;
-
- /* Get XCR0 from XSAVE extended state at byte 464. */
- xcr0 = xstateregs[464 / sizeof (long long)];
-
- /* Use PTRACE_GETREGSET if it is available. */
- for (regset = target_regsets;
- regset->fill_function != NULL; regset++)
- if (regset->get_request == PTRACE_GETREGSET)
- regset->size = I386_XSTATE_SIZE (xcr0);
- else if (regset->type != GENERAL_REGS)
- regset->size = 0;
}
- if (have_ptrace_getregset)
+ /* Check the native XCR0 only if PTRACE_GETREGSET is available. */
+ xcr0_features = (have_ptrace_getregset
+ && (xcr0 & X86_XSTATE_ALL_MASK));
+
+ if (xcr0_features)
+ x86_xcr0 = xcr0;
+
+ if (machine == EM_X86_64)
{
- /* AVX is the highest feature we support. */
- if ((xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
+#ifdef __x86_64__
+ if (is_elf64)
{
- x86_xcr0 = xcr0;
+ if (xcr0_features)
+ {
+ switch (xcr0 & X86_XSTATE_ALL_MASK)
+ {
+ case X86_XSTATE_AVX512_MASK:
+ return tdesc_amd64_avx512_linux;
-#ifdef __x86_64__
- /* I386 has 8 xmm regs. */
- if (num_xmm_registers == 8)
- init_registers_i386_avx_linux ();
+ case X86_XSTATE_MPX_MASK:
+ return tdesc_amd64_mpx_linux;
+
+ case X86_XSTATE_AVX_MASK:
+ return tdesc_amd64_avx_linux;
+
+ default:
+ return tdesc_amd64_linux;
+ }
+ }
else
- init_registers_amd64_avx_linux ();
-#else
- init_registers_i386_avx_linux ();
+ return tdesc_amd64_linux;
+ }
+ else
+ {
+ if (xcr0_features)
+ {
+ switch (xcr0 & X86_XSTATE_ALL_MASK)
+ {
+ case X86_XSTATE_AVX512_MASK:
+ return tdesc_x32_avx512_linux;
+
+ case X86_XSTATE_MPX_MASK: /* No MPX on x32. */
+ case X86_XSTATE_AVX_MASK:
+ return tdesc_x32_avx_linux;
+
+ default:
+ return tdesc_x32_linux;
+ }
+ }
+ else
+ return tdesc_x32_linux;
+ }
#endif
+ }
+ else
+ {
+ if (xcr0_features)
+ {
+ switch (xcr0 & X86_XSTATE_ALL_MASK)
+ {
+ case (X86_XSTATE_AVX512_MASK):
+ return tdesc_i386_avx512_linux;
+
+ case (X86_XSTATE_MPX_MASK):
+ return tdesc_i386_mpx_linux;
+
+ case (X86_XSTATE_AVX_MASK):
+ return tdesc_i386_avx_linux;
+
+ default:
+ return tdesc_i386_linux;
+ }
}
+ else
+ return tdesc_i386_linux;
}
+
+ gdb_assert_not_reached ("failed to return tdesc");
+}
+
+/* Callback for find_inferior. Stops iteration when a thread with a
+ given PID is found. */
+
+static int
+same_process_callback (struct inferior_list_entry *entry, void *data)
+{
+ int pid = *(int *) data;
+
+ return (ptid_get_pid (entry->id) == pid);
+}
+
+/* Callback for for_each_inferior. Calls the arch_setup routine for
+ each process. */
+
+static void
+x86_arch_setup_process_callback (struct inferior_list_entry *entry)
+{
+ int pid = ptid_get_pid (entry->id);
+
+ /* Look up any thread of this processes. */
+ current_thread
+ = (struct thread_info *) find_inferior (&all_threads,
+ same_process_callback, &pid);
+
+ the_low_target.arch_setup ();
+}
+
+/* Update all the target description of all processes; a new GDB
+ connected, and it may or not support xml target descriptions. */
+
+static void
+x86_linux_update_xmltarget (void)
+{
+ struct thread_info *saved_thread = current_thread;
+
+ /* Before changing the register cache's internal layout, flush the
+ contents of the current valid caches back to the threads, and
+ release the current regcache objects. */
+ regcache_release ();
+
+ for_each_inferior (&all_processes, x86_arch_setup_process_callback);
+
+ current_thread = saved_thread;
}
/* Process qSupported query, "xmlRegisters=". Update the buffer size for
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_linux_update_xmltarget ();
}
-/* Initialize gdbserver for the architecture of the inferior. */
-
-static void
-x86_arch_setup (void)
-{
-#ifdef __x86_64__
- int pid = pid_of (get_thread_lwp (current_inferior));
- int use_64bit = linux_pid_exe_is_elf_64_file (pid);
-
- if (use_64bit < 0)
- {
- /* This can only happen if /proc/<pid>/exe is unreadable,
- but "that can't happen" if we've gotten this far.
- Fall through and assume this is a 32-bit program. */
- }
- else if (use_64bit)
- {
- /* Amd64 doesn't have HAVE_LINUX_USRREGS. */
- the_low_target.num_regs = -1;
- the_low_target.regmap = NULL;
- the_low_target.cannot_fetch_register = NULL;
- the_low_target.cannot_store_register = NULL;
+/* Common for x86/x86-64. */
- /* Amd64 has 16 xmm regs. */
- num_xmm_registers = 16;
+static struct regsets_info x86_regsets_info =
+ {
+ x86_regsets, /* regsets */
+ 0, /* num_regsets */
+ NULL, /* disabled_regsets */
+ };
- x86_linux_update_xmltarget ();
- return;
- }
+#ifdef __x86_64__
+static struct regs_info amd64_linux_regs_info =
+ {
+ NULL, /* regset_bitmap */
+ NULL, /* usrregs_info */
+ &x86_regsets_info
+ };
#endif
+static struct usrregs_info i386_linux_usrregs_info =
+ {
+ I386_NUM_REGS,
+ i386_regmap,
+ };
- /* Ok we have a 32-bit inferior. */
+static struct regs_info i386_linux_regs_info =
+ {
+ NULL, /* regset_bitmap */
+ &i386_linux_usrregs_info,
+ &x86_regsets_info
+ };
- the_low_target.num_regs = I386_NUM_REGS;
- the_low_target.regmap = i386_regmap;
- the_low_target.cannot_fetch_register = i386_cannot_fetch_register;
- the_low_target.cannot_store_register = i386_cannot_store_register;
+const struct regs_info *
+x86_linux_regs_info (void)
+{
+#ifdef __x86_64__
+ if (is_64bit_tdesc ())
+ return &amd64_linux_regs_info;
+ else
+#endif
+ return &i386_linux_regs_info;
+}
- /* I386 has 8 xmm regs. */
- num_xmm_registers = 8;
+/* Initialize the target description for the architecture of the
+ inferior. */
- x86_linux_update_xmltarget ();
+static void
+x86_arch_setup (void)
+{
+ current_process ()->tdesc = x86_linux_read_description ();
}
static int
char *err)
{
#ifdef __x86_64__
- if (register_size (0) == 8)
+ if (is_64bit_tdesc ())
return amd64_install_fast_tracepoint_jump_pad (tpoint, tpaddr,
collector, lockaddr,
orig_size, jump_entry,
#ifdef __x86_64__
/* On x86-64, 5-byte jump instructions with a 4-byte offset are always
used for fast tracepoints. */
- if (register_size (0) == 8)
+ if (is_64bit_tdesc ())
return 5;
#endif
CORE_ADDR buildaddr = current_insn_ptr;
if (debug_threads)
- fprintf (stderr, "Adding %d bytes of insn at %s\n",
- len, paddress (buildaddr));
+ debug_printf ("Adding %d bytes of insn at %s\n",
+ len, paddress (buildaddr));
append_insns (&buildaddr, len, start);
current_insn_ptr = buildaddr;
x86_emit_ops (void)
{
#ifdef __x86_64__
- int use_64bit = register_size (0) == 8;
-
- if (use_64bit)
+ if (is_64bit_tdesc ())
return &amd64_emit_ops;
else
#endif
return &i386_emit_ops;
}
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
+
+static const gdb_byte *
+x86_sw_breakpoint_from_kind (int kind, int *size)
+{
+ *size = x86_breakpoint_len;
+ return x86_breakpoint;
+}
+
+static int
+x86_supports_range_stepping (void)
+{
+ return 1;
+}
+
/* This is initialized assuming an amd64 target.
x86_arch_setup will correct it for i386 or amd64 targets. */
struct linux_target_ops the_low_target =
{
x86_arch_setup,
- -1,
- NULL,
- NULL,
- NULL,
- NULL,
+ x86_linux_regs_info,
+ x86_cannot_fetch_register,
+ x86_cannot_store_register,
+ NULL, /* fetch_register */
x86_get_pc,
x86_set_pc,
- x86_breakpoint,
- x86_breakpoint_len,
+ NULL, /* breakpoint_kind_from_pc */
+ x86_sw_breakpoint_from_kind,
NULL,
1,
x86_breakpoint_at,
+ x86_supports_z_point_type,
x86_insert_point,
x86_remove_point,
x86_stopped_by_watchpoint,
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,
x86_install_fast_tracepoint_jump_pad,
x86_emit_ops,
x86_get_min_fast_tracepoint_insn_len,
+ x86_supports_range_stepping,
};
+
+void
+initialize_low_arch (void)
+{
+ /* Initialize the Linux target descriptions. */
+#ifdef __x86_64__
+ init_registers_amd64_linux ();
+ init_registers_amd64_avx_linux ();
+ init_registers_amd64_avx512_linux ();
+ init_registers_amd64_mpx_linux ();
+
+ init_registers_x32_linux ();
+ init_registers_x32_avx_linux ();
+ init_registers_x32_avx512_linux ();
+
+ tdesc_amd64_linux_no_xml = XNEW (struct target_desc);
+ copy_target_description (tdesc_amd64_linux_no_xml, tdesc_amd64_linux);
+ tdesc_amd64_linux_no_xml->xmltarget = xmltarget_amd64_linux_no_xml;
+#endif
+ init_registers_i386_linux ();
+ init_registers_i386_mmx_linux ();
+ init_registers_i386_avx_linux ();
+ init_registers_i386_avx512_linux ();
+ init_registers_i386_mpx_linux ();
+
+ tdesc_i386_linux_no_xml = XNEW (struct target_desc);
+ copy_target_description (tdesc_i386_linux_no_xml, tdesc_i386_linux);
+ tdesc_i386_linux_no_xml->xmltarget = xmltarget_i386_linux_no_xml;
+
+ initialize_regsets_info (&x86_regsets_info);
+}
projects / deliverable / binutils-gdb.git / blobdiff