/* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
- Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
- Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2006, 2007, 2008 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "linux-low.h"
+#include <sys/ptrace.h>
+
+#include "gdb_proc_service.h"
+
+/* Defined in auto-generated file reg-arm.c. */
+void init_registers_arm (void);
+/* Defined in auto-generated file arm-with-iwmmxt.c. */
+void init_registers_arm_with_iwmmxt (void);
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 22
+#endif
+
+#ifndef PTRACE_GETWMMXREGS
+# define PTRACE_GETWMMXREGS 18
+# define PTRACE_SETWMMXREGS 19
+#endif
+
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
-#define arm_num_regs 16
+#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
return (regno >= arm_num_regs);
}
+static void
+arm_fill_gregset (void *buf)
+{
+ int i;
+
+ for (i = 0; i < arm_num_regs; i++)
+ if (arm_regmap[i] != -1)
+ collect_register (i, ((char *) buf) + arm_regmap[i]);
+}
+
+static void
+arm_store_gregset (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 (i, ((char *) buf) + arm_regmap[i]);
+ else
+ supply_register (i, zerobuf);
+}
+
+#ifdef __IWMMXT__
+
+static void
+arm_fill_wmmxregset (void *buf)
+{
+ int i;
+
+ for (i = 0; i < 16; i++)
+ collect_register (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 (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
+}
+
+static void
+arm_store_wmmxregset (const void *buf)
+{
+ int i;
+
+ for (i = 0; i < 16; i++)
+ supply_register (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 (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
+}
+
+#endif /* __IWMMXT__ */
+
+extern int debug_threads;
+
+static CORE_ADDR
+arm_get_pc ()
+{
+ unsigned long pc;
+ collect_register_by_name ("pc", &pc);
+ if (debug_threads)
+ fprintf (stderr, "stop pc is %08lx\n", pc);
+ return pc;
+}
+
+static void
+arm_set_pc (CORE_ADDR pc)
+{
+ unsigned long newpc = pc;
+ supply_register_by_name ("pc", &newpc);
+}
+
+/* Correct in either endianness. We do not support Thumb yet. */
+static const unsigned long arm_breakpoint = 0xef9f0001;
+#define arm_breakpoint_len 4
+
+/* 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)
+{
+ 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;
+
+ /* If necessary, recognize more trap instructions here. GDB only uses the
+ two. */
+
+ 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 ()
+{
+ unsigned long pc;
+ collect_register_by_name ("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;
+}
+
+struct regset_info target_regsets[] = {
+ { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4,
+ GENERAL_REGS,
+ arm_fill_gregset, arm_store_gregset },
+#ifdef __IWMMXT__
+ { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4,
+ EXTENDED_REGS,
+ arm_fill_wmmxregset, arm_store_wmmxregset },
+#endif
+ { 0, 0, -1, -1, NULL, NULL }
+};
+
struct linux_target_ops the_low_target = {
+#ifdef __IWMMXT__
+ init_registers_arm_with_iwmmxt,
+#else
+ init_registers_arm,
+#endif
arm_num_regs,
arm_regmap,
arm_cannot_fetch_register,
arm_cannot_store_register,
+ arm_get_pc,
+ arm_set_pc,
+#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,
};
projects / deliverable / binutils-gdb.git / blobdiff