#include "record-full.h"
#include <algorithm>
-#include "features/arm-with-m.c"
-#include "features/arm-with-m-fpa-layout.c"
-#include "features/arm-with-m-vfp-d16.c"
-#include "features/arm-with-iwmmxt.c"
-#include "features/arm-with-vfpv2.c"
-#include "features/arm-with-vfpv3.c"
-#include "features/arm-with-neon.c"
+#include "features/arm/arm-with-m.c"
+#include "features/arm/arm-with-m-fpa-layout.c"
+#include "features/arm/arm-with-m-vfp-d16.c"
+#include "features/arm/arm-with-iwmmxt.c"
+#include "features/arm/arm-with-vfpv2.c"
+#include "features/arm/arm-with-vfpv3.c"
+#include "features/arm/arm-with-neon.c"
static int arm_debug;
static const char *arm_fallback_mode_string = "auto";
static const char *arm_force_mode_string = "auto";
-/* Internal override of the execution mode. -1 means no override,
- 0 means override to ARM mode, 1 means override to Thumb mode.
- The effect is the same as if arm_force_mode has been set by the
- user (except the internal override has precedence over a user's
- arm_force_mode override). */
-static int arm_override_mode = -1;
-
/* Number of different reg name sets (options). */
static int num_disassembly_options;
if (IS_THUMB_ADDR (memaddr))
return 1;
- /* Respect internal mode override if active. */
- if (arm_override_mode != -1)
- return arm_override_mode;
-
/* If the user wants to override the symbol table, let him. */
if (strcmp (arm_force_mode_string, "arm") == 0)
return 0;
return 0;
}
+/* Determine if the address specified equals any of these magic return
+ values, called EXC_RETURN, defined by the ARM v6-M and v7-M
+ architectures.
+
+ From ARMv6-M Reference Manual B1.5.8
+ Table B1-5 Exception return behavior
+
+ EXC_RETURN Return To Return Stack
+ 0xFFFFFFF1 Handler mode Main
+ 0xFFFFFFF9 Thread mode Main
+ 0xFFFFFFFD Thread mode Process
+
+ From ARMv7-M Reference Manual B1.5.8
+ Table B1-8 EXC_RETURN definition of exception return behavior, no FP
+
+ EXC_RETURN Return To Return Stack
+ 0xFFFFFFF1 Handler mode Main
+ 0xFFFFFFF9 Thread mode Main
+ 0xFFFFFFFD Thread mode Process
+
+ Table B1-9 EXC_RETURN definition of exception return behavior, with
+ FP
+
+ EXC_RETURN Return To Return Stack Frame Type
+ 0xFFFFFFE1 Handler mode Main Extended
+ 0xFFFFFFE9 Thread mode Main Extended
+ 0xFFFFFFED Thread mode Process Extended
+ 0xFFFFFFF1 Handler mode Main Basic
+ 0xFFFFFFF9 Thread mode Main Basic
+ 0xFFFFFFFD Thread mode Process Basic
+
+ For more details see "B1.5.8 Exception return behavior"
+ in both ARMv6-M and ARMv7-M Architecture Reference Manuals. */
+
+static int
+arm_m_addr_is_magic (CORE_ADDR addr)
+{
+ switch (addr)
+ {
+ /* Values from Tables in B1.5.8 the EXC_RETURN definitions of
+ the exception return behavior. */
+ case 0xffffffe1:
+ case 0xffffffe9:
+ case 0xffffffed:
+ case 0xfffffff1:
+ case 0xfffffff9:
+ case 0xfffffffd:
+ /* Address is magic. */
+ return 1;
+
+ default:
+ /* Address is not magic. */
+ return 0;
+ }
+}
+
/* Remove useless bits from addresses in a running program. */
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)
+ && arm_m_addr_is_magic (val))
return val;
if (arm_apcs_32)
/* 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;
+ /* Check if exception frame returns to a magic PC value. */
+ return arm_m_addr_is_magic (this_pc);
}
/* Frame unwinder for M-profile exceptions. */
&d, dbl);
}
-/* Like insert_single_step_breakpoint, but make sure we use a breakpoint
- of the appropriate mode (as encoded in the PC value), even if this
- differs from what would be expected according to the symbol tables. */
-
-void
-arm_insert_single_step_breakpoint (struct gdbarch *gdbarch,
- struct address_space *aspace,
- CORE_ADDR pc)
-{
- struct cleanup *old_chain
- = make_cleanup_restore_integer (&arm_override_mode);
-
- arm_override_mode = IS_THUMB_ADDR (pc);
- pc = gdbarch_addr_bits_remove (gdbarch, pc);
-
- insert_single_step_breakpoint (gdbarch, aspace, pc);
-
- do_cleanups (old_chain);
-}
-
/* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand
the buffer to be NEW_LEN bytes ending at ENDADDR. Return
NULL if an error occurs. BUF is freed. */
next_pcs = arm_get_next_pcs (&next_pcs_ctx);
for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
- arm_insert_single_step_breakpoint (gdbarch, aspace, pc);
+ {
+ pc = gdbarch_addr_bits_remove (gdbarch, pc);
+ insert_single_step_breakpoint (gdbarch, aspace, pc);
+ }
do_cleanups (old_chain);
static const gdb_byte arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
static const gdb_byte arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
-/* Determine the type and size of breakpoint to insert at PCPTR. Uses
- the program counter value to determine whether a 16-bit or 32-bit
- breakpoint should be used. It returns a pointer to a string of
- bytes that encode a breakpoint instruction, stores the length of
- the string to *lenptr, and adjusts the program counter (if
- necessary) to point to the actual memory location where the
- breakpoint should be inserted. */
+/* Implement the breakpoint_kind_from_pc gdbarch method. */
-static const unsigned char *
-arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr)
+static int
+arm_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
if (tdep->thumb2_breakpoint != NULL)
{
gdb_byte buf[2];
+
if (target_read_memory (*pcptr, buf, 2) == 0)
{
unsigned short inst1;
+
inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code);
if (thumb_insn_size (inst1) == 4)
- {
- *lenptr = tdep->thumb2_breakpoint_size;
- return tdep->thumb2_breakpoint;
- }
+ return ARM_BP_KIND_THUMB2;
}
}
- *lenptr = tdep->thumb_breakpoint_size;
- return tdep->thumb_breakpoint;
+ return ARM_BP_KIND_THUMB;
}
else
+ return ARM_BP_KIND_ARM;
+
+}
+
+/* Implement the sw_breakpoint_from_kind gdbarch method. */
+
+static const gdb_byte *
+arm_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ switch (kind)
{
- *lenptr = tdep->arm_breakpoint_size;
+ case ARM_BP_KIND_ARM:
+ *size = tdep->arm_breakpoint_size;
return tdep->arm_breakpoint;
+ case ARM_BP_KIND_THUMB:
+ *size = tdep->thumb_breakpoint_size;
+ return tdep->thumb_breakpoint;
+ case ARM_BP_KIND_THUMB2:
+ *size = tdep->thumb2_breakpoint_size;
+ return tdep->thumb2_breakpoint;
+ default:
+ gdb_assert_not_reached ("unexpected arm breakpoint kind");
}
}
-static void
-arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
- int *kindptr)
+/* Implement the breakpoint_kind_from_current_state gdbarch method. */
+
+static int
+arm_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ CORE_ADDR *pcptr)
{
- arm_breakpoint_from_pc (gdbarch, pcptr, kindptr);
+ gdb_byte buf[4];
+
+ /* Check the memory pointed by PC is readable. */
+ if (target_read_memory (regcache_read_pc (regcache), buf, 4) == 0)
+ {
+ struct arm_get_next_pcs next_pcs_ctx;
+ CORE_ADDR pc;
+ int i;
+ VEC (CORE_ADDR) *next_pcs = NULL;
+ struct cleanup *old_chain
+ = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
+
+ arm_get_next_pcs_ctor (&next_pcs_ctx,
+ &arm_get_next_pcs_ops,
+ gdbarch_byte_order (gdbarch),
+ gdbarch_byte_order_for_code (gdbarch),
+ 0,
+ regcache);
+
+ next_pcs = arm_get_next_pcs (&next_pcs_ctx);
+
+ /* If MEMADDR is the next instruction of current pc, do the
+ software single step computation, and get the thumb mode by
+ the destination address. */
+ for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
+ {
+ if (UNMAKE_THUMB_ADDR (pc) == *pcptr)
+ {
+ do_cleanups (old_chain);
+
+ if (IS_THUMB_ADDR (pc))
+ {
+ *pcptr = MAKE_THUMB_ADDR (*pcptr);
+ return arm_breakpoint_kind_from_pc (gdbarch, pcptr);
+ }
+ else
+ return ARM_BP_KIND_ARM;
+ }
+ }
+
+ do_cleanups (old_chain);
+ }
- if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4)
- /* The documented magic value for a 32-bit Thumb-2 breakpoint, so
- that this is not confused with a 32-bit ARM breakpoint. */
- *kindptr = 3;
+ return arm_breakpoint_kind_from_pc (gdbarch, pcptr);
}
/* Extract from an array REGBUF containing the (raw) register state a
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
/* Breakpoint manipulation. */
- set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc);
- set_gdbarch_remote_breakpoint_from_pc (gdbarch,
- arm_remote_breakpoint_from_pc);
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch, arm_breakpoint_kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch, arm_sw_breakpoint_from_kind);
+ set_gdbarch_breakpoint_kind_from_current_state (gdbarch,
+ arm_breakpoint_kind_from_current_state);
/* Information about registers, etc. */
set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM);
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