923 lines
24 KiB
C
923 lines
24 KiB
C
/* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
|
|
Copyright (C) 1995-2014 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
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 "server.h"
|
|
#include "linux-low.h"
|
|
|
|
/* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h.
|
|
On Bionic elf.h and linux/elf.h have conflicting definitions. */
|
|
#ifndef ELFMAG0
|
|
#include <elf.h>
|
|
#endif
|
|
#include <sys/ptrace.h>
|
|
#include <signal.h>
|
|
|
|
/* Defined in auto-generated files. */
|
|
void init_registers_arm (void);
|
|
extern const struct target_desc *tdesc_arm;
|
|
|
|
void init_registers_arm_with_iwmmxt (void);
|
|
extern const struct target_desc *tdesc_arm_with_iwmmxt;
|
|
|
|
void init_registers_arm_with_vfpv2 (void);
|
|
extern const struct target_desc *tdesc_arm_with_vfpv2;
|
|
|
|
void init_registers_arm_with_vfpv3 (void);
|
|
extern const struct target_desc *tdesc_arm_with_vfpv3;
|
|
|
|
void init_registers_arm_with_neon (void);
|
|
extern const struct target_desc *tdesc_arm_with_neon;
|
|
|
|
#ifndef PTRACE_GET_THREAD_AREA
|
|
#define PTRACE_GET_THREAD_AREA 22
|
|
#endif
|
|
|
|
#ifndef PTRACE_GETWMMXREGS
|
|
# define PTRACE_GETWMMXREGS 18
|
|
# define PTRACE_SETWMMXREGS 19
|
|
#endif
|
|
|
|
#ifndef PTRACE_GETVFPREGS
|
|
# define PTRACE_GETVFPREGS 27
|
|
# define PTRACE_SETVFPREGS 28
|
|
#endif
|
|
|
|
#ifndef PTRACE_GETHBPREGS
|
|
#define PTRACE_GETHBPREGS 29
|
|
#define PTRACE_SETHBPREGS 30
|
|
#endif
|
|
|
|
/* Information describing the hardware breakpoint capabilities. */
|
|
static struct
|
|
{
|
|
unsigned char arch;
|
|
unsigned char max_wp_length;
|
|
unsigned char wp_count;
|
|
unsigned char bp_count;
|
|
} arm_linux_hwbp_cap;
|
|
|
|
/* Enum describing the different types of ARM hardware break-/watch-points. */
|
|
typedef enum
|
|
{
|
|
arm_hwbp_break = 0,
|
|
arm_hwbp_load = 1,
|
|
arm_hwbp_store = 2,
|
|
arm_hwbp_access = 3
|
|
} arm_hwbp_type;
|
|
|
|
/* Type describing an ARM Hardware Breakpoint Control register value. */
|
|
typedef unsigned int arm_hwbp_control_t;
|
|
|
|
/* Structure used to keep track of hardware break-/watch-points. */
|
|
struct arm_linux_hw_breakpoint
|
|
{
|
|
/* Address to break on, or being watched. */
|
|
unsigned int address;
|
|
/* Control register for break-/watch- point. */
|
|
arm_hwbp_control_t control;
|
|
};
|
|
|
|
/* Since we cannot dynamically allocate subfields of arch_process_info,
|
|
assume a maximum number of supported break-/watchpoints. */
|
|
#define MAX_BPTS 32
|
|
#define MAX_WPTS 32
|
|
|
|
/* Per-process arch-specific data we want to keep. */
|
|
struct arch_process_info
|
|
{
|
|
/* Hardware breakpoints for this process. */
|
|
struct arm_linux_hw_breakpoint bpts[MAX_BPTS];
|
|
/* Hardware watchpoints for this process. */
|
|
struct arm_linux_hw_breakpoint wpts[MAX_WPTS];
|
|
};
|
|
|
|
/* 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. */
|
|
char bpts_changed[MAX_BPTS];
|
|
char wpts_changed[MAX_WPTS];
|
|
/* Cached stopped data address. */
|
|
CORE_ADDR stopped_data_address;
|
|
};
|
|
|
|
static unsigned long arm_hwcap;
|
|
|
|
/* These are in <asm/elf.h> in current kernels. */
|
|
#define HWCAP_VFP 64
|
|
#define HWCAP_IWMMXT 512
|
|
#define HWCAP_NEON 4096
|
|
#define HWCAP_VFPv3 8192
|
|
#define HWCAP_VFPv3D16 16384
|
|
|
|
#ifdef HAVE_SYS_REG_H
|
|
#include <sys/reg.h>
|
|
#endif
|
|
|
|
#define arm_num_regs 26
|
|
|
|
static int arm_regmap[] = {
|
|
0, 4, 8, 12, 16, 20, 24, 28,
|
|
32, 36, 40, 44, 48, 52, 56, 60,
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
64
|
|
};
|
|
|
|
static int
|
|
arm_cannot_store_register (int regno)
|
|
{
|
|
return (regno >= arm_num_regs);
|
|
}
|
|
|
|
static int
|
|
arm_cannot_fetch_register (int regno)
|
|
{
|
|
return (regno >= arm_num_regs);
|
|
}
|
|
|
|
static void
|
|
arm_fill_gregset (struct regcache *regcache, void *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < arm_num_regs; i++)
|
|
if (arm_regmap[i] != -1)
|
|
collect_register (regcache, i, ((char *) buf) + arm_regmap[i]);
|
|
}
|
|
|
|
static void
|
|
arm_store_gregset (struct regcache *regcache, const void *buf)
|
|
{
|
|
int i;
|
|
char zerobuf[8];
|
|
|
|
memset (zerobuf, 0, 8);
|
|
for (i = 0; i < arm_num_regs; i++)
|
|
if (arm_regmap[i] != -1)
|
|
supply_register (regcache, i, ((char *) buf) + arm_regmap[i]);
|
|
else
|
|
supply_register (regcache, i, zerobuf);
|
|
}
|
|
|
|
static void
|
|
arm_fill_wmmxregset (struct regcache *regcache, void *buf)
|
|
{
|
|
int i;
|
|
|
|
if (!(arm_hwcap & HWCAP_IWMMXT))
|
|
return;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
collect_register (regcache, arm_num_regs + i, (char *) buf + i * 8);
|
|
|
|
/* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
|
|
for (i = 0; i < 6; i++)
|
|
collect_register (regcache, arm_num_regs + i + 16,
|
|
(char *) buf + 16 * 8 + i * 4);
|
|
}
|
|
|
|
static void
|
|
arm_store_wmmxregset (struct regcache *regcache, const void *buf)
|
|
{
|
|
int i;
|
|
|
|
if (!(arm_hwcap & HWCAP_IWMMXT))
|
|
return;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
supply_register (regcache, arm_num_regs + i, (char *) buf + i * 8);
|
|
|
|
/* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
|
|
for (i = 0; i < 6; i++)
|
|
supply_register (regcache, arm_num_regs + i + 16,
|
|
(char *) buf + 16 * 8 + i * 4);
|
|
}
|
|
|
|
static void
|
|
arm_fill_vfpregset (struct regcache *regcache, void *buf)
|
|
{
|
|
int i, num, base;
|
|
|
|
if (!(arm_hwcap & HWCAP_VFP))
|
|
return;
|
|
|
|
if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
|
|
num = 32;
|
|
else
|
|
num = 16;
|
|
|
|
base = find_regno (regcache->tdesc, "d0");
|
|
for (i = 0; i < num; i++)
|
|
collect_register (regcache, base + i, (char *) buf + i * 8);
|
|
|
|
collect_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
|
|
}
|
|
|
|
static void
|
|
arm_store_vfpregset (struct regcache *regcache, const void *buf)
|
|
{
|
|
int i, num, base;
|
|
|
|
if (!(arm_hwcap & HWCAP_VFP))
|
|
return;
|
|
|
|
if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
|
|
num = 32;
|
|
else
|
|
num = 16;
|
|
|
|
base = find_regno (regcache->tdesc, "d0");
|
|
for (i = 0; i < num; i++)
|
|
supply_register (regcache, base + i, (char *) buf + i * 8);
|
|
|
|
supply_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8);
|
|
}
|
|
|
|
extern int debug_threads;
|
|
|
|
static CORE_ADDR
|
|
arm_get_pc (struct regcache *regcache)
|
|
{
|
|
unsigned long pc;
|
|
collect_register_by_name (regcache, "pc", &pc);
|
|
if (debug_threads)
|
|
debug_printf ("stop pc is %08lx\n", pc);
|
|
return pc;
|
|
}
|
|
|
|
static void
|
|
arm_set_pc (struct regcache *regcache, CORE_ADDR pc)
|
|
{
|
|
unsigned long newpc = pc;
|
|
supply_register_by_name (regcache, "pc", &newpc);
|
|
}
|
|
|
|
/* Correct in either endianness. */
|
|
static const unsigned long arm_breakpoint = 0xef9f0001;
|
|
#define arm_breakpoint_len 4
|
|
static const unsigned short thumb_breakpoint = 0xde01;
|
|
static const unsigned short thumb2_breakpoint[] = { 0xf7f0, 0xa000 };
|
|
|
|
/* For new EABI binaries. We recognize it regardless of which ABI
|
|
is used for gdbserver, so single threaded debugging should work
|
|
OK, but for multi-threaded debugging we only insert the current
|
|
ABI's breakpoint instruction. For now at least. */
|
|
static const unsigned long arm_eabi_breakpoint = 0xe7f001f0;
|
|
|
|
static int
|
|
arm_breakpoint_at (CORE_ADDR where)
|
|
{
|
|
struct regcache *regcache = get_thread_regcache (current_inferior, 1);
|
|
unsigned long cpsr;
|
|
|
|
collect_register_by_name (regcache, "cpsr", &cpsr);
|
|
|
|
if (cpsr & 0x20)
|
|
{
|
|
/* Thumb mode. */
|
|
unsigned short insn;
|
|
|
|
(*the_target->read_memory) (where, (unsigned char *) &insn, 2);
|
|
if (insn == thumb_breakpoint)
|
|
return 1;
|
|
|
|
if (insn == thumb2_breakpoint[0])
|
|
{
|
|
(*the_target->read_memory) (where + 2, (unsigned char *) &insn, 2);
|
|
if (insn == thumb2_breakpoint[1])
|
|
return 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* ARM mode. */
|
|
unsigned long insn;
|
|
|
|
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
|
|
if (insn == arm_breakpoint)
|
|
return 1;
|
|
|
|
if (insn == arm_eabi_breakpoint)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We only place breakpoints in empty marker functions, and thread locking
|
|
is outside of the function. So rather than importing software single-step,
|
|
we can just run until exit. */
|
|
static CORE_ADDR
|
|
arm_reinsert_addr (void)
|
|
{
|
|
struct regcache *regcache = get_thread_regcache (current_inferior, 1);
|
|
unsigned long pc;
|
|
collect_register_by_name (regcache, "lr", &pc);
|
|
return pc;
|
|
}
|
|
|
|
/* Fetch the thread-local storage pointer for libthread_db. */
|
|
|
|
ps_err_e
|
|
ps_get_thread_area (const struct ps_prochandle *ph,
|
|
lwpid_t lwpid, int idx, void **base)
|
|
{
|
|
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
|
|
return PS_ERR;
|
|
|
|
/* IDX is the bias from the thread pointer to the beginning of the
|
|
thread descriptor. It has to be subtracted due to implementation
|
|
quirks in libthread_db. */
|
|
*base = (void *) ((char *)*base - idx);
|
|
|
|
return PS_OK;
|
|
}
|
|
|
|
|
|
/* Query Hardware Breakpoint information for the target we are attached to
|
|
(using PID as ptrace argument) and set up arm_linux_hwbp_cap. */
|
|
static void
|
|
arm_linux_init_hwbp_cap (int pid)
|
|
{
|
|
unsigned int val;
|
|
|
|
if (ptrace (PTRACE_GETHBPREGS, pid, 0, &val) < 0)
|
|
return;
|
|
|
|
arm_linux_hwbp_cap.arch = (unsigned char)((val >> 24) & 0xff);
|
|
if (arm_linux_hwbp_cap.arch == 0)
|
|
return;
|
|
|
|
arm_linux_hwbp_cap.max_wp_length = (unsigned char)((val >> 16) & 0xff);
|
|
arm_linux_hwbp_cap.wp_count = (unsigned char)((val >> 8) & 0xff);
|
|
arm_linux_hwbp_cap.bp_count = (unsigned char)(val & 0xff);
|
|
|
|
if (arm_linux_hwbp_cap.wp_count > MAX_WPTS)
|
|
internal_error (__FILE__, __LINE__, "Unsupported number of watchpoints");
|
|
if (arm_linux_hwbp_cap.bp_count > MAX_BPTS)
|
|
internal_error (__FILE__, __LINE__, "Unsupported number of breakpoints");
|
|
}
|
|
|
|
/* How many hardware breakpoints are available? */
|
|
static int
|
|
arm_linux_get_hw_breakpoint_count (void)
|
|
{
|
|
return arm_linux_hwbp_cap.bp_count;
|
|
}
|
|
|
|
/* How many hardware watchpoints are available? */
|
|
static int
|
|
arm_linux_get_hw_watchpoint_count (void)
|
|
{
|
|
return arm_linux_hwbp_cap.wp_count;
|
|
}
|
|
|
|
/* Maximum length of area watched by hardware watchpoint. */
|
|
static int
|
|
arm_linux_get_hw_watchpoint_max_length (void)
|
|
{
|
|
return arm_linux_hwbp_cap.max_wp_length;
|
|
}
|
|
|
|
/* Initialize an ARM hardware break-/watch-point control register value.
|
|
BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
|
|
type of break-/watch-point; ENABLE indicates whether the point is enabled.
|
|
*/
|
|
static arm_hwbp_control_t
|
|
arm_hwbp_control_initialize (unsigned byte_address_select,
|
|
arm_hwbp_type hwbp_type,
|
|
int enable)
|
|
{
|
|
gdb_assert ((byte_address_select & ~0xffU) == 0);
|
|
gdb_assert (hwbp_type != arm_hwbp_break
|
|
|| ((byte_address_select & 0xfU) != 0));
|
|
|
|
return (byte_address_select << 5) | (hwbp_type << 3) | (3 << 1) | enable;
|
|
}
|
|
|
|
/* Does the breakpoint control value CONTROL have the enable bit set? */
|
|
static int
|
|
arm_hwbp_control_is_enabled (arm_hwbp_control_t control)
|
|
{
|
|
return control & 0x1;
|
|
}
|
|
|
|
/* Is the breakpoint control value CONTROL initialized? */
|
|
static int
|
|
arm_hwbp_control_is_initialized (arm_hwbp_control_t control)
|
|
{
|
|
return control != 0;
|
|
}
|
|
|
|
/* Change a breakpoint control word so that it is in the disabled state. */
|
|
static arm_hwbp_control_t
|
|
arm_hwbp_control_disable (arm_hwbp_control_t control)
|
|
{
|
|
return control & ~0x1;
|
|
}
|
|
|
|
/* Are two break-/watch-points equal? */
|
|
static int
|
|
arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint *p1,
|
|
const struct arm_linux_hw_breakpoint *p2)
|
|
{
|
|
return p1->address == p2->address && p1->control == p2->control;
|
|
}
|
|
|
|
/* Initialize the hardware breakpoint structure P for a breakpoint or
|
|
watchpoint at ADDR to LEN. The type of watchpoint is given in TYPE.
|
|
Returns -1 if TYPE is unsupported, or -2 if the particular combination
|
|
of ADDR and LEN cannot be implemented. Otherwise, returns 0 if TYPE
|
|
represents a breakpoint and 1 if type represents a watchpoint. */
|
|
static int
|
|
arm_linux_hw_point_initialize (char type, CORE_ADDR addr, int len,
|
|
struct arm_linux_hw_breakpoint *p)
|
|
{
|
|
arm_hwbp_type hwbp_type;
|
|
unsigned mask;
|
|
|
|
/* Breakpoint/watchpoint types (GDB terminology):
|
|
0 = memory breakpoint for instructions
|
|
(not supported; done via memory write instead)
|
|
1 = hardware breakpoint for instructions (supported)
|
|
2 = write watchpoint (supported)
|
|
3 = read watchpoint (supported)
|
|
4 = access watchpoint (supported). */
|
|
switch (type)
|
|
{
|
|
case '1':
|
|
hwbp_type = arm_hwbp_break;
|
|
break;
|
|
case '2':
|
|
hwbp_type = arm_hwbp_store;
|
|
break;
|
|
case '3':
|
|
hwbp_type = arm_hwbp_load;
|
|
break;
|
|
case '4':
|
|
hwbp_type = arm_hwbp_access;
|
|
break;
|
|
default:
|
|
/* Unsupported. */
|
|
return -1;
|
|
}
|
|
|
|
if (hwbp_type == arm_hwbp_break)
|
|
{
|
|
/* For breakpoints, the length field encodes the mode. */
|
|
switch (len)
|
|
{
|
|
case 2: /* 16-bit Thumb mode breakpoint */
|
|
case 3: /* 32-bit Thumb mode breakpoint */
|
|
mask = 0x3;
|
|
addr &= ~1;
|
|
break;
|
|
case 4: /* 32-bit ARM mode breakpoint */
|
|
mask = 0xf;
|
|
addr &= ~3;
|
|
break;
|
|
default:
|
|
/* Unsupported. */
|
|
return -2;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
CORE_ADDR max_wp_length = arm_linux_get_hw_watchpoint_max_length ();
|
|
CORE_ADDR aligned_addr;
|
|
|
|
/* Can not set watchpoints for zero or negative lengths. */
|
|
if (len <= 0)
|
|
return -2;
|
|
/* The current ptrace interface can only handle watchpoints that are a
|
|
power of 2. */
|
|
if ((len & (len - 1)) != 0)
|
|
return -2;
|
|
|
|
/* Test that the range [ADDR, ADDR + LEN) fits into the largest address
|
|
range covered by a watchpoint. */
|
|
aligned_addr = addr & ~(max_wp_length - 1);
|
|
if (aligned_addr + max_wp_length < addr + len)
|
|
return -2;
|
|
|
|
mask = (1 << len) - 1;
|
|
}
|
|
|
|
p->address = (unsigned int) addr;
|
|
p->control = arm_hwbp_control_initialize (mask, hwbp_type, 1);
|
|
|
|
return hwbp_type != arm_hwbp_break;
|
|
}
|
|
|
|
/* Callback to mark a watch-/breakpoint to be updated in all threads of
|
|
the current process. */
|
|
|
|
struct update_registers_data
|
|
{
|
|
int watch;
|
|
int i;
|
|
};
|
|
|
|
static int
|
|
update_registers_callback (struct inferior_list_entry *entry, void *arg)
|
|
{
|
|
struct thread_info *thread = (struct thread_info *) entry;
|
|
struct lwp_info *lwp = get_thread_lwp (thread);
|
|
struct update_registers_data *data = (struct update_registers_data *) arg;
|
|
|
|
/* Only update the threads of the current process. */
|
|
if (pid_of (thread) == pid_of (current_inferior))
|
|
{
|
|
/* The actual update is done later just before resuming the lwp,
|
|
we just mark that the registers need updating. */
|
|
if (data->watch)
|
|
lwp->arch_private->wpts_changed[data->i] = 1;
|
|
else
|
|
lwp->arch_private->bpts_changed[data->i] = 1;
|
|
|
|
/* If the lwp isn't stopped, force it to momentarily pause, so
|
|
we can update its breakpoint registers. */
|
|
if (!lwp->stopped)
|
|
linux_stop_lwp (lwp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Insert hardware break-/watchpoint. */
|
|
static int
|
|
arm_insert_point (char type, CORE_ADDR addr, int len)
|
|
{
|
|
struct process_info *proc = current_process ();
|
|
struct arm_linux_hw_breakpoint p, *pts;
|
|
int watch, i, count;
|
|
|
|
watch = arm_linux_hw_point_initialize (type, addr, len, &p);
|
|
if (watch < 0)
|
|
{
|
|
/* Unsupported. */
|
|
return watch == -1 ? 1 : -1;
|
|
}
|
|
|
|
if (watch)
|
|
{
|
|
count = arm_linux_get_hw_watchpoint_count ();
|
|
pts = proc->private->arch_private->wpts;
|
|
}
|
|
else
|
|
{
|
|
count = arm_linux_get_hw_breakpoint_count ();
|
|
pts = proc->private->arch_private->bpts;
|
|
}
|
|
|
|
for (i = 0; i < count; i++)
|
|
if (!arm_hwbp_control_is_enabled (pts[i].control))
|
|
{
|
|
struct update_registers_data data = { watch, i };
|
|
pts[i] = p;
|
|
find_inferior (&all_threads, update_registers_callback, &data);
|
|
return 0;
|
|
}
|
|
|
|
/* We're out of watchpoints. */
|
|
return -1;
|
|
}
|
|
|
|
/* Remove hardware break-/watchpoint. */
|
|
static int
|
|
arm_remove_point (char type, CORE_ADDR addr, int len)
|
|
{
|
|
struct process_info *proc = current_process ();
|
|
struct arm_linux_hw_breakpoint p, *pts;
|
|
int watch, i, count;
|
|
|
|
watch = arm_linux_hw_point_initialize (type, addr, len, &p);
|
|
if (watch < 0)
|
|
{
|
|
/* Unsupported. */
|
|
return -1;
|
|
}
|
|
|
|
if (watch)
|
|
{
|
|
count = arm_linux_get_hw_watchpoint_count ();
|
|
pts = proc->private->arch_private->wpts;
|
|
}
|
|
else
|
|
{
|
|
count = arm_linux_get_hw_breakpoint_count ();
|
|
pts = proc->private->arch_private->bpts;
|
|
}
|
|
|
|
for (i = 0; i < count; i++)
|
|
if (arm_linux_hw_breakpoint_equal (&p, pts + i))
|
|
{
|
|
struct update_registers_data data = { watch, i };
|
|
pts[i].control = arm_hwbp_control_disable (pts[i].control);
|
|
find_inferior (&all_threads, update_registers_callback, &data);
|
|
return 0;
|
|
}
|
|
|
|
/* No watchpoint matched. */
|
|
return -1;
|
|
}
|
|
|
|
/* Return whether current thread is stopped due to a watchpoint. */
|
|
static int
|
|
arm_stopped_by_watchpoint (void)
|
|
{
|
|
struct lwp_info *lwp = get_thread_lwp (current_inferior);
|
|
siginfo_t siginfo;
|
|
|
|
/* We must be able to set hardware watchpoints. */
|
|
if (arm_linux_get_hw_watchpoint_count () == 0)
|
|
return 0;
|
|
|
|
/* Retrieve siginfo. */
|
|
errno = 0;
|
|
ptrace (PTRACE_GETSIGINFO, lwpid_of (current_inferior), 0, &siginfo);
|
|
if (errno != 0)
|
|
return 0;
|
|
|
|
/* This must be a hardware breakpoint. */
|
|
if (siginfo.si_signo != SIGTRAP
|
|
|| (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
|
|
return 0;
|
|
|
|
/* If we are in a positive slot then we're looking at a breakpoint and not
|
|
a watchpoint. */
|
|
if (siginfo.si_errno >= 0)
|
|
return 0;
|
|
|
|
/* Cache stopped data address for use by arm_stopped_data_address. */
|
|
lwp->arch_private->stopped_data_address
|
|
= (CORE_ADDR) (uintptr_t) siginfo.si_addr;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Return data address that triggered watchpoint. Called only if
|
|
arm_stopped_by_watchpoint returned true. */
|
|
static CORE_ADDR
|
|
arm_stopped_data_address (void)
|
|
{
|
|
struct lwp_info *lwp = get_thread_lwp (current_inferior);
|
|
return lwp->arch_private->stopped_data_address;
|
|
}
|
|
|
|
/* Called when a new process is created. */
|
|
static struct arch_process_info *
|
|
arm_new_process (void)
|
|
{
|
|
struct arch_process_info *info = xcalloc (1, sizeof (*info));
|
|
return info;
|
|
}
|
|
|
|
/* Called when a new thread is detected. */
|
|
static struct arch_lwp_info *
|
|
arm_new_thread (void)
|
|
{
|
|
struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_BPTS; i++)
|
|
info->bpts_changed[i] = 1;
|
|
for (i = 0; i < MAX_WPTS; i++)
|
|
info->wpts_changed[i] = 1;
|
|
|
|
return info;
|
|
}
|
|
|
|
/* Called when resuming a thread.
|
|
If the debug regs have changed, update the thread's copies. */
|
|
static void
|
|
arm_prepare_to_resume (struct lwp_info *lwp)
|
|
{
|
|
struct thread_info *thread = get_lwp_thread (lwp);
|
|
int pid = lwpid_of (thread);
|
|
struct process_info *proc = find_process_pid (pid_of (thread));
|
|
struct arch_process_info *proc_info = proc->private->arch_private;
|
|
struct arch_lwp_info *lwp_info = lwp->arch_private;
|
|
int i;
|
|
|
|
for (i = 0; i < arm_linux_get_hw_breakpoint_count (); i++)
|
|
if (lwp_info->bpts_changed[i])
|
|
{
|
|
errno = 0;
|
|
|
|
if (arm_hwbp_control_is_enabled (proc_info->bpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) ((i << 1) + 1),
|
|
&proc_info->bpts[i].address) < 0)
|
|
perror_with_name ("Unexpected error setting breakpoint address");
|
|
|
|
if (arm_hwbp_control_is_initialized (proc_info->bpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) ((i << 1) + 2),
|
|
&proc_info->bpts[i].control) < 0)
|
|
perror_with_name ("Unexpected error setting breakpoint");
|
|
|
|
lwp_info->bpts_changed[i] = 0;
|
|
}
|
|
|
|
for (i = 0; i < arm_linux_get_hw_watchpoint_count (); i++)
|
|
if (lwp_info->wpts_changed[i])
|
|
{
|
|
errno = 0;
|
|
|
|
if (arm_hwbp_control_is_enabled (proc_info->wpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) -((i << 1) + 1),
|
|
&proc_info->wpts[i].address) < 0)
|
|
perror_with_name ("Unexpected error setting watchpoint address");
|
|
|
|
if (arm_hwbp_control_is_initialized (proc_info->wpts[i].control))
|
|
if (ptrace (PTRACE_SETHBPREGS, pid,
|
|
(PTRACE_TYPE_ARG3) -((i << 1) + 2),
|
|
&proc_info->wpts[i].control) < 0)
|
|
perror_with_name ("Unexpected error setting watchpoint");
|
|
|
|
lwp_info->wpts_changed[i] = 0;
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
arm_get_hwcap (unsigned long *valp)
|
|
{
|
|
unsigned char *data = alloca (8);
|
|
int offset = 0;
|
|
|
|
while ((*the_target->read_auxv) (offset, data, 8) == 8)
|
|
{
|
|
unsigned int *data_p = (unsigned int *)data;
|
|
if (data_p[0] == AT_HWCAP)
|
|
{
|
|
*valp = data_p[1];
|
|
return 1;
|
|
}
|
|
|
|
offset += 8;
|
|
}
|
|
|
|
*valp = 0;
|
|
return 0;
|
|
}
|
|
|
|
static const struct target_desc *
|
|
arm_read_description (void)
|
|
{
|
|
int pid = lwpid_of (current_inferior);
|
|
|
|
/* Query hardware watchpoint/breakpoint capabilities. */
|
|
arm_linux_init_hwbp_cap (pid);
|
|
|
|
arm_hwcap = 0;
|
|
if (arm_get_hwcap (&arm_hwcap) == 0)
|
|
return tdesc_arm;
|
|
|
|
if (arm_hwcap & HWCAP_IWMMXT)
|
|
return tdesc_arm_with_iwmmxt;
|
|
|
|
if (arm_hwcap & HWCAP_VFP)
|
|
{
|
|
const struct target_desc *result;
|
|
char *buf;
|
|
|
|
/* NEON implies either no VFP, or VFPv3-D32. We only support
|
|
it with VFP. */
|
|
if (arm_hwcap & HWCAP_NEON)
|
|
result = tdesc_arm_with_neon;
|
|
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
|
|
result = tdesc_arm_with_vfpv3;
|
|
else
|
|
result = tdesc_arm_with_vfpv2;
|
|
|
|
/* Now make sure that the kernel supports reading these
|
|
registers. Support was added in 2.6.30. */
|
|
errno = 0;
|
|
buf = xmalloc (32 * 8 + 4);
|
|
if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
|
|
&& errno == EIO)
|
|
{
|
|
arm_hwcap = 0;
|
|
result = tdesc_arm;
|
|
}
|
|
free (buf);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* The default configuration uses legacy FPA registers, probably
|
|
simulated. */
|
|
return tdesc_arm;
|
|
}
|
|
|
|
static void
|
|
arm_arch_setup (void)
|
|
{
|
|
current_process ()->tdesc = arm_read_description ();
|
|
}
|
|
|
|
static struct regset_info arm_regsets[] = {
|
|
{ PTRACE_GETREGS, PTRACE_SETREGS, 0, 18 * 4,
|
|
GENERAL_REGS,
|
|
arm_fill_gregset, arm_store_gregset },
|
|
{ PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 0, 16 * 8 + 6 * 4,
|
|
EXTENDED_REGS,
|
|
arm_fill_wmmxregset, arm_store_wmmxregset },
|
|
{ PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 0, 32 * 8 + 4,
|
|
EXTENDED_REGS,
|
|
arm_fill_vfpregset, arm_store_vfpregset },
|
|
{ 0, 0, 0, -1, -1, NULL, NULL }
|
|
};
|
|
|
|
static struct regsets_info arm_regsets_info =
|
|
{
|
|
arm_regsets, /* regsets */
|
|
0, /* num_regsets */
|
|
NULL, /* disabled_regsets */
|
|
};
|
|
|
|
static struct usrregs_info arm_usrregs_info =
|
|
{
|
|
arm_num_regs,
|
|
arm_regmap,
|
|
};
|
|
|
|
static struct regs_info regs_info =
|
|
{
|
|
NULL, /* regset_bitmap */
|
|
&arm_usrregs_info,
|
|
&arm_regsets_info
|
|
};
|
|
|
|
static const struct regs_info *
|
|
arm_regs_info (void)
|
|
{
|
|
return ®s_info;
|
|
}
|
|
|
|
struct linux_target_ops the_low_target = {
|
|
arm_arch_setup,
|
|
arm_regs_info,
|
|
arm_cannot_fetch_register,
|
|
arm_cannot_store_register,
|
|
NULL, /* fetch_register */
|
|
arm_get_pc,
|
|
arm_set_pc,
|
|
|
|
/* Define an ARM-mode breakpoint; we only set breakpoints in the C
|
|
library, which is most likely to be ARM. If the kernel supports
|
|
clone events, we will never insert a breakpoint, so even a Thumb
|
|
C library will work; so will mixing EABI/non-EABI gdbserver and
|
|
application. */
|
|
#ifndef __ARM_EABI__
|
|
(const unsigned char *) &arm_breakpoint,
|
|
#else
|
|
(const unsigned char *) &arm_eabi_breakpoint,
|
|
#endif
|
|
arm_breakpoint_len,
|
|
arm_reinsert_addr,
|
|
0,
|
|
arm_breakpoint_at,
|
|
arm_insert_point,
|
|
arm_remove_point,
|
|
arm_stopped_by_watchpoint,
|
|
arm_stopped_data_address,
|
|
NULL, /* collect_ptrace_register */
|
|
NULL, /* supply_ptrace_register */
|
|
NULL, /* siginfo_fixup */
|
|
arm_new_process,
|
|
arm_new_thread,
|
|
arm_prepare_to_resume,
|
|
};
|
|
|
|
void
|
|
initialize_low_arch (void)
|
|
{
|
|
/* Initialize the Linux target descriptions. */
|
|
init_registers_arm ();
|
|
init_registers_arm_with_iwmmxt ();
|
|
init_registers_arm_with_vfpv2 ();
|
|
init_registers_arm_with_vfpv3 ();
|
|
init_registers_arm_with_neon ();
|
|
|
|
initialize_regsets_info (&arm_regsets_info);
|
|
}
|