/* Common target dependent code for GDB on ARM systems.
- Copyright (C) 1988-1989, 1991-1993, 1995-1996, 1998-2012 Free
- Software Foundation, Inc.
+ Copyright (C) 1988-2013 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 "defs.h"
+
#include <ctype.h> /* XXX for isupper (). */
-#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcmd.h"
static CORE_ADDR
arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
{
+ /* On M-profile devices, do not strip the low bit from EXC_RETURN
+ (the magic exception return address). */
+ if (gdbarch_tdep (gdbarch)->is_m
+ && (val & 0xfffffff0) == 0xfffffff0)
+ return val;
+
if (arm_apcs_32)
return UNMAKE_THUMB_ADDR (val);
else
return (val & 0x03fffffc);
}
-/* When reading symbols, we need to zap the low bit of the address,
- which may be set to 1 for Thumb functions. */
-static CORE_ADDR
-arm_smash_text_address (struct gdbarch *gdbarch, CORE_ADDR val)
-{
- return val & ~1;
-}
-
/* Return 1 if PC is the start of a compiler helper function which
can be safely ignored during prologue skipping. IS_THUMB is true
if the function is known to be a Thumb function due to the way it
if (post_prologue_pc
&& (s == NULL
|| s->producer == NULL
- || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0))
+ || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0
+ || strncmp (s->producer, "clang ", sizeof ("clang ") - 1) == 0))
return post_prologue_pc;
if (post_prologue_pc != 0)
arm_stub_unwind_sniffer
};
+/* Put here the code to store, into CACHE->saved_regs, the addresses
+ of the saved registers of frame described by THIS_FRAME. CACHE is
+ returned. */
+
+static struct arm_prologue_cache *
+arm_m_exception_cache (struct frame_info *this_frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct arm_prologue_cache *cache;
+ CORE_ADDR unwound_sp;
+ LONGEST xpsr;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ unwound_sp = get_frame_register_unsigned (this_frame,
+ ARM_SP_REGNUM);
+
+ /* The hardware saves eight 32-bit words, comprising xPSR,
+ ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in
+ "B1.5.6 Exception entry behavior" in
+ "ARMv7-M Architecture Reference Manual". */
+ cache->saved_regs[0].addr = unwound_sp;
+ cache->saved_regs[1].addr = unwound_sp + 4;
+ cache->saved_regs[2].addr = unwound_sp + 8;
+ cache->saved_regs[3].addr = unwound_sp + 12;
+ cache->saved_regs[12].addr = unwound_sp + 16;
+ cache->saved_regs[14].addr = unwound_sp + 20;
+ cache->saved_regs[15].addr = unwound_sp + 24;
+ cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28;
+
+ /* If bit 9 of the saved xPSR is set, then there is a four-byte
+ aligner between the top of the 32-byte stack frame and the
+ previous context's stack pointer. */
+ cache->prev_sp = unwound_sp + 32;
+ if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr)
+ && (xpsr & (1 << 9)) != 0)
+ cache->prev_sp += 4;
+
+ return cache;
+}
+
+/* Implementation of function hook 'this_id' in
+ 'struct frame_uwnind'. */
+
+static void
+arm_m_exception_this_id (struct frame_info *this_frame,
+ void **this_cache,
+ struct frame_id *this_id)
+{
+ struct arm_prologue_cache *cache;
+
+ if (*this_cache == NULL)
+ *this_cache = arm_m_exception_cache (this_frame);
+ cache = *this_cache;
+
+ /* Our frame ID for a stub frame is the current SP and LR. */
+ *this_id = frame_id_build (cache->prev_sp,
+ get_frame_pc (this_frame));
+}
+
+/* Implementation of function hook 'prev_register' in
+ 'struct frame_uwnind'. */
+
+static struct value *
+arm_m_exception_prev_register (struct frame_info *this_frame,
+ void **this_cache,
+ int prev_regnum)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct arm_prologue_cache *cache;
+
+ if (*this_cache == NULL)
+ *this_cache = arm_m_exception_cache (this_frame);
+ cache = *this_cache;
+
+ /* The value was already reconstructed into PREV_SP. */
+ if (prev_regnum == ARM_SP_REGNUM)
+ return frame_unwind_got_constant (this_frame, prev_regnum,
+ cache->prev_sp);
+
+ return trad_frame_get_prev_register (this_frame, cache->saved_regs,
+ prev_regnum);
+}
+
+/* Implementation of function hook 'sniffer' in
+ 'struct frame_uwnind'. */
+
+static int
+arm_m_exception_unwind_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ CORE_ADDR this_pc = get_frame_pc (this_frame);
+
+ /* No need to check is_m; this sniffer is only registered for
+ M-profile architectures. */
+
+ /* Exception frames return to one of these magic PCs. Other values
+ are not defined as of v7-M. See details in "B1.5.8 Exception
+ return behavior" in "ARMv7-M Architecture Reference Manual". */
+ if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9
+ || this_pc == 0xfffffffd)
+ return 1;
+
+ return 0;
+}
+
+/* Frame unwinder for M-profile exceptions. */
+
+struct frame_unwind arm_m_exception_unwind =
+{
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ arm_m_exception_this_id,
+ arm_m_exception_prev_register,
+ NULL,
+ arm_m_exception_unwind_sniffer
+};
+
static CORE_ADDR
arm_normal_frame_base (struct frame_info *this_frame, void **this_cache)
{
else if ((insn & 0x0fff0000) == 0x08bd0000)
/* POP (LDMIA). */
found_stack_adjust = 1;
+ else if ((insn & 0x0fff0000) == 0x049d0000)
+ /* POP of a single register. */
+ found_stack_adjust = 1;
}
if (found_stack_adjust)
case TYPE_CODE_FLT:
case TYPE_CODE_SET:
case TYPE_CODE_RANGE:
- case TYPE_CODE_BITSTRING:
case TYPE_CODE_REF:
case TYPE_CODE_CHAR:
case TYPE_CODE_BOOL:
val + i * unit_length);
else
{
- sprintf (name_buf, "%c%d", reg_char, reg_scaled + i);
+ xsnprintf (name_buf, sizeof (name_buf), "%c%d",
+ reg_char, reg_scaled + i);
regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
regcache_cooked_write (regcache, regnum,
{
char name_buf[4];
- sprintf (name_buf, "s%d", reg - 64);
+ xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64);
return user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
}
{
char name_buf[4];
- sprintf (name_buf, "d%d", reg - 256);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256);
return user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
}
else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */
{
if (bits (inst1, 3, 6) == 0x0f)
- nextpc = pc_val;
+ nextpc = UNMAKE_THUMB_ADDR (pc_val);
else
nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6));
}
char name_buf[4];
int regnum;
- sprintf (name_buf, "%c%d", reg_char, i);
+ xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i);
regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
if (writebuf)
struct gdbarch_info info;
/* If the current architecture is not ARM, we have nothing to do. */
- if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_arm)
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm)
return;
/* Update the architecture. */
show_fp_model (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
if (arm_fp_model == ARM_FLOAT_AUTO
- && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm)
+ && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm)
fprintf_filtered (file, _("\
The current ARM floating point model is \"auto\" (currently \"%s\").\n"),
fp_model_strings[tdep->fp_model]);
arm_show_abi (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
if (arm_abi_global == ARM_ABI_AUTO
- && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm)
+ && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm)
fprintf_filtered (file, _("\
The current ARM ABI is \"auto\" (currently \"%s\").\n"),
arm_abi_strings[tdep->arm_abi]);
arm_show_force_mode (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ());
fprintf_filtered (file,
_("The current execution mode assumed "
int offset, double_regnum;
enum register_status status;
- sprintf (name_buf, "d%d", regnum << 1);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1);
double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
else
offset = (regnum & 1) ? 4 : 0;
- sprintf (name_buf, "d%d", regnum >> 1);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1);
double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
char name_buf[4];
int offset, double_regnum;
- sprintf (name_buf, "d%d", regnum << 1);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1);
double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
else
offset = (regnum & 1) ? 4 : 0;
- sprintf (name_buf, "d%d", regnum >> 1);
+ xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1);
double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
strlen (name_buf));
frame_base_set_default (gdbarch, &arm_normal_base);
/* Address manipulation. */
- set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address);
set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove);
/* Advance PC across function entry code. */
dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg);
/* Add some default predicates. */
+ if (is_m)
+ frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind);
frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind);
dwarf2_append_unwinders (gdbarch);
frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind);
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