-/* Target dependent code for the Motorola 68000 series.
- Copyright (C) 1990, 1992 Free Software Foundation, Inc.
+/* Target-dependent code for the Motorola 68000 series.
-This file is part of GDB.
+ Copyright (C) 1990-2019 Free Software Foundation, Inc.
-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
-(at your option) any later version.
+ This file is part of GDB.
-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.
+ 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.
-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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 "defs.h"
-#include "ieee-float.h"
+#include "dwarf2-frame.h"
#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "gdbtypes.h"
#include "symtab.h"
+#include "gdbcore.h"
+#include "value.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "arch-utils.h"
+#include "osabi.h"
+#include "dis-asm.h"
+#include "target-descriptions.h"
+#include "floatformat.h"
+#include "target-float.h"
+
+#include "m68k-tdep.h"
+\f
-const struct ext_format ext_format_68881 = {
-/* tot sbyte smask expbyte manbyte */
- 12, 0, 0x80, 0,1, 4,8 /* mc68881 */
-};
+#define P_LINKL_FP 0x480e
+#define P_LINKW_FP 0x4e56
+#define P_PEA_FP 0x4856
+#define P_MOVEAL_SP_FP 0x2c4f
+#define P_ADDAW_SP 0xdefc
+#define P_ADDAL_SP 0xdffc
+#define P_SUBQW_SP 0x514f
+#define P_SUBQL_SP 0x518f
+#define P_LEA_SP_SP 0x4fef
+#define P_LEA_PC_A5 0x4bfb0170
+#define P_FMOVEMX_SP 0xf227
+#define P_MOVEL_SP 0x2f00
+#define P_MOVEML_SP 0x48e7
+
+/* Offset from SP to first arg on stack at first instruction of a function. */
+#define SP_ARG0 (1 * 4)
+
+#if !defined (BPT_VECTOR)
+#define BPT_VECTOR 0xf
+#endif
+
+constexpr gdb_byte m68k_break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
+typedef BP_MANIPULATION (m68k_break_insn) m68k_breakpoint;
\f
-/* Things needed for making the inferior call functions.
- It seems like every m68k based machine has almost identical definitions
- in the individual machine's configuration files. Most other cpu types
- (mips, i386, etc) have routines in their *-tdep.c files to handle this
- for most configurations. The m68k family should be able to do this as
- well. These macros can still be overridden when necessary. */
-/* Push an empty stack frame, to record the current PC, etc. */
+/* Construct types for ISA-specific registers. */
+static struct type *
+m68k_ps_type (struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-void
-m68k_push_dummy_frame ()
+ if (!tdep->m68k_ps_type)
+ {
+ struct type *type;
+
+ type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 32);
+ append_flags_type_flag (type, 0, "C");
+ append_flags_type_flag (type, 1, "V");
+ append_flags_type_flag (type, 2, "Z");
+ append_flags_type_flag (type, 3, "N");
+ append_flags_type_flag (type, 4, "X");
+ append_flags_type_flag (type, 8, "I0");
+ append_flags_type_flag (type, 9, "I1");
+ append_flags_type_flag (type, 10, "I2");
+ append_flags_type_flag (type, 12, "M");
+ append_flags_type_flag (type, 13, "S");
+ append_flags_type_flag (type, 14, "T0");
+ append_flags_type_flag (type, 15, "T1");
+
+ tdep->m68k_ps_type = type;
+ }
+
+ return tdep->m68k_ps_type;
+}
+
+static struct type *
+m68881_ext_type (struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (!tdep->m68881_ext_type)
+ tdep->m68881_ext_type
+ = arch_float_type (gdbarch, -1, "builtin_type_m68881_ext",
+ floatformats_m68881_ext);
+
+ return tdep->m68881_ext_type;
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+ register N. This should be int for D0-D7, SR, FPCONTROL and
+ FPSTATUS, long double for FP0-FP7, and void pointer for all others
+ (A0-A7, PC, FPIADDR). Note, for registers which contain
+ addresses return pointer to void, not pointer to char, because we
+ don't want to attempt to print the string after printing the
+ address. */
+
+static struct type *
+m68k_register_type (struct gdbarch *gdbarch, int regnum)
{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int regnum;
- char raw_buffer[12];
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- sp = push_word (sp, read_register (PC_REGNUM));
- sp = push_word (sp, read_register (FP_REGNUM));
- write_register (FP_REGNUM, sp);
-#if defined (HAVE_68881)
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ if (tdep->fpregs_present)
{
- read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
- sp = push_bytes (sp, raw_buffer, 12);
+ if (regnum >= gdbarch_fp0_regnum (gdbarch)
+ && regnum <= gdbarch_fp0_regnum (gdbarch) + 7)
+ {
+ if (tdep->flavour == m68k_coldfire_flavour)
+ return builtin_type (gdbarch)->builtin_double;
+ else
+ return m68881_ext_type (gdbarch);
+ }
+
+ if (regnum == M68K_FPI_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
+
+ if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM)
+ return builtin_type (gdbarch)->builtin_int32;
}
-#endif
- for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
+ else
{
- sp = push_word (sp, read_register (regnum));
+ if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM)
+ return builtin_type (gdbarch)->builtin_int0;
}
- sp = push_word (sp, read_register (PS_REGNUM));
- write_register (SP_REGNUM, sp);
+
+ if (regnum == gdbarch_pc_regnum (gdbarch))
+ return builtin_type (gdbarch)->builtin_func_ptr;
+
+ if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7)
+ return builtin_type (gdbarch)->builtin_data_ptr;
+
+ if (regnum == M68K_PS_REGNUM)
+ return m68k_ps_type (gdbarch);
+
+ return builtin_type (gdbarch)->builtin_int32;
}
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
+static const char *m68k_register_names[] = {
+ "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
+ "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp",
+ "ps", "pc",
+ "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7",
+ "fpcontrol", "fpstatus", "fpiaddr"
+ };
-void
-m68k_pop_frame ()
-{
- register FRAME frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- struct frame_saved_regs fsr;
- struct frame_info *fi;
- char raw_buffer[12];
-
- fi = get_frame_info (frame);
- fp = fi -> frame;
- get_frame_saved_regs (fi, &fsr);
-#if defined (HAVE_68881)
- for (regnum = FP0_REGNUM + 7 ; regnum >= FP0_REGNUM ; regnum--)
+/* Function: m68k_register_name
+ Returns the name of the standard m68k register regnum. */
+
+static const char *
+m68k_register_name (struct gdbarch *gdbarch, int regnum)
+{
+ if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names))
+ internal_error (__FILE__, __LINE__,
+ _("m68k_register_name: illegal register number %d"),
+ regnum);
+ else if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM
+ && gdbarch_tdep (gdbarch)->fpregs_present == 0)
+ return "";
+ else
+ return m68k_register_names[regnum];
+}
+\f
+/* Return nonzero if a value of type TYPE stored in register REGNUM
+ needs any special handling. */
+
+static int
+m68k_convert_register_p (struct gdbarch *gdbarch,
+ int regnum, struct type *type)
+{
+ if (!gdbarch_tdep (gdbarch)->fpregs_present)
+ return 0;
+ return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7
+ /* We only support floating-point values. */
+ && TYPE_CODE (type) == TYPE_CODE_FLT
+ && type != register_type (gdbarch, M68K_FP0_REGNUM));
+}
+
+/* Read a value of type TYPE from register REGNUM in frame FRAME, and
+ return its contents in TO. */
+
+static int
+m68k_register_to_value (struct frame_info *frame, int regnum,
+ struct type *type, gdb_byte *to,
+ int *optimizedp, int *unavailablep)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ gdb_byte from[M68K_MAX_REGISTER_SIZE];
+ struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM);
+
+ gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT);
+
+ /* Convert to TYPE. */
+ if (!get_frame_register_bytes (frame, regnum, 0,
+ register_size (gdbarch, regnum),
+ from, optimizedp, unavailablep))
+ return 0;
+
+ target_float_convert (from, fpreg_type, to, type);
+ *optimizedp = *unavailablep = 0;
+ return 1;
+}
+
+/* Write the contents FROM of a value of type TYPE into register
+ REGNUM in frame FRAME. */
+
+static void
+m68k_value_to_register (struct frame_info *frame, int regnum,
+ struct type *type, const gdb_byte *from)
+{
+ gdb_byte to[M68K_MAX_REGISTER_SIZE];
+ struct type *fpreg_type = register_type (get_frame_arch (frame),
+ M68K_FP0_REGNUM);
+
+ /* We only support floating-point values. */
+ if (TYPE_CODE (type) != TYPE_CODE_FLT)
+ {
+ warning (_("Cannot convert non-floating-point type "
+ "to floating-point register value."));
+ return;
+ }
+
+ /* Convert from TYPE. */
+ target_float_convert (from, type, to, fpreg_type);
+ put_frame_register (frame, regnum, to);
+}
+
+\f
+/* There is a fair number of calling conventions that are in somewhat
+ wide use. The 68000/08/10 don't support an FPU, not even as a
+ coprocessor. All function return values are stored in %d0/%d1.
+ Structures are returned in a static buffer, a pointer to which is
+ returned in %d0. This means that functions returning a structure
+ are not re-entrant. To avoid this problem some systems use a
+ convention where the caller passes a pointer to a buffer in %a1
+ where the return values is to be stored. This convention is the
+ default, and is implemented in the function m68k_return_value.
+
+ The 68020/030/040/060 do support an FPU, either as a coprocessor
+ (68881/2) or built-in (68040/68060). That's why System V release 4
+ (SVR4) introduces a new calling convention specified by the SVR4
+ psABI. Integer values are returned in %d0/%d1, pointer return
+ values in %a0 and floating values in %fp0. When calling functions
+ returning a structure the caller should pass a pointer to a buffer
+ for the return value in %a0. This convention is implemented in the
+ function m68k_svr4_return_value, and by appropriately setting the
+ struct_value_regnum member of `struct gdbarch_tdep'.
+
+ GNU/Linux returns values in the same way as SVR4 does, but uses %a1
+ for passing the structure return value buffer.
+
+ GCC can also generate code where small structures are returned in
+ %d0/%d1 instead of in memory by using -freg-struct-return. This is
+ the default on NetBSD a.out, OpenBSD and GNU/Linux and several
+ embedded systems. This convention is implemented by setting the
+ struct_return member of `struct gdbarch_tdep' to reg_struct_return. */
+
+/* Read a function return value of TYPE from REGCACHE, and copy that
+ into VALBUF. */
+
+static void
+m68k_extract_return_value (struct type *type, struct regcache *regcache,
+ gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
+
+ if (len <= 4)
+ {
+ regcache->raw_read (M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (4 - len), len);
+ }
+ else if (len <= 8)
+ {
+ regcache->raw_read (M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (8 - len), len - 4);
+ regcache->raw_read (M68K_D1_REGNUM, valbuf + (len - 4));
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value of %d bytes long."), len);
+}
+
+static void
+m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache,
+ gdb_byte *valbuf)
+{
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
+ struct gdbarch *gdbarch = regcache->arch ();
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT)
{
- if (fsr.regs[regnum])
+ struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM);
+ regcache->raw_read (M68K_FP0_REGNUM, buf);
+ target_float_convert (buf, fpreg_type, valbuf, type);
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4)
+ regcache->raw_read (M68K_A0_REGNUM, valbuf);
+ else
+ m68k_extract_return_value (type, regcache, valbuf);
+}
+
+/* Write a function return value of TYPE from VALBUF into REGCACHE. */
+
+static void
+m68k_store_return_value (struct type *type, struct regcache *regcache,
+ const gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+
+ if (len <= 4)
+ regcache->raw_write_part (M68K_D0_REGNUM, 4 - len, len, valbuf);
+ else if (len <= 8)
+ {
+ regcache->raw_write_part (M68K_D0_REGNUM, 8 - len, len - 4, valbuf);
+ regcache->raw_write (M68K_D1_REGNUM, valbuf + (len - 4));
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value of %d bytes long."), len);
+}
+
+static void
+m68k_svr4_store_return_value (struct type *type, struct regcache *regcache,
+ const gdb_byte *valbuf)
+{
+ struct gdbarch *gdbarch = regcache->arch ();
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM);
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
+ target_float_convert (valbuf, type, buf, fpreg_type);
+ regcache->raw_write (M68K_FP0_REGNUM, buf);
+ }
+ else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4)
+ {
+ regcache->raw_write (M68K_A0_REGNUM, valbuf);
+ regcache->raw_write (M68K_D0_REGNUM, valbuf);
+ }
+ else
+ m68k_store_return_value (type, regcache, valbuf);
+}
+
+/* Return non-zero if TYPE, which is assumed to be a structure, union or
+ complex type, should be returned in registers for architecture
+ GDBARCH. */
+
+static int
+m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum type_code code = TYPE_CODE (type);
+ int len = TYPE_LENGTH (type);
+
+ gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_COMPLEX);
+
+ if (tdep->struct_return == pcc_struct_return)
+ return 0;
+
+ return (len == 1 || len == 2 || len == 4 || len == 8);
+}
+
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+m68k_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ enum type_code code = TYPE_CODE (type);
+
+ /* GCC returns a `long double' in memory too. */
+ if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_COMPLEX)
+ && !m68k_reg_struct_return_p (gdbarch, type))
+ || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12))
+ {
+ /* The default on m68k is to return structures in static memory.
+ Consequently a function must return the address where we can
+ find the return value. */
+
+ if (readbuf)
{
- read_memory (fsr.regs[regnum], raw_buffer, 12);
- write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
+ ULONGEST addr;
+
+ regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
}
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
-#endif
- for (regnum = FP_REGNUM - 1 ; regnum >= 0 ; regnum--)
+
+ if (readbuf)
+ m68k_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ m68k_store_return_value (type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+static enum return_value_convention
+m68k_svr4_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ enum type_code code = TYPE_CODE (type);
+
+ if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_COMPLEX)
+ && !m68k_reg_struct_return_p (gdbarch, type))
{
- if (fsr.regs[regnum])
+ /* The System V ABI says that:
+
+ "A function returning a structure or union also sets %a0 to
+ the value it finds in %a0. Thus when the caller receives
+ control again, the address of the returned object resides in
+ register %a0."
+
+ So the ABI guarantees that we can always find the return
+ value just after the function has returned. */
+
+ if (readbuf)
{
- write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
+ ULONGEST addr;
+
+ regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
}
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
- if (fsr.regs[PS_REGNUM])
+
+ /* This special case is for structures consisting of a single
+ `float' or `double' member. These structures are returned in
+ %fp0. For these structures, we call ourselves recursively,
+ changing TYPE into the type of the first member of the structure.
+ Since that should work for all structures that have only one
+ member, we don't bother to check the member's type here. */
+ if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
{
- write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4));
+ type = check_typedef (TYPE_FIELD_TYPE (type, 0));
+ return m68k_svr4_return_value (gdbarch, function, type, regcache,
+ readbuf, writebuf);
}
- write_register (FP_REGNUM, read_memory_integer (fp, 4));
- write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
- write_register (SP_REGNUM, fp + 8);
- flush_cached_frames ();
- set_current_frame (create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
-}
+ if (readbuf)
+ m68k_svr4_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ m68k_svr4_store_return_value (type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
\f
-/* Given an ip value corresponding to the start of a function,
- return the ip of the first instruction after the function
- prologue. This is the generic m68k support. Machines which
- require something different can override the SKIP_PROLOGUE
- macro to point elsewhere.
- Some instructions which typically may appear in a function
- prologue include:
+/* Always align the frame to a 4-byte boundary. This is required on
+ coldfire and harmless on the rest. */
- A link instruction, word form:
+static CORE_ADDR
+m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+ /* Align the stack to four bytes. */
+ return sp & ~3;
+}
- link.w %a6,&0 4e56 XXXX
+static CORE_ADDR
+m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp,
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[4];
+ int i;
+
+ /* Push arguments in reverse order. */
+ for (i = nargs - 1; i >= 0; i--)
+ {
+ struct type *value_type = value_enclosing_type (args[i]);
+ int len = TYPE_LENGTH (value_type);
+ int container_len = (len + 3) & ~3;
+ int offset;
+
+ /* Non-scalars bigger than 4 bytes are left aligned, others are
+ right aligned. */
+ if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (value_type) == TYPE_CODE_UNION
+ || TYPE_CODE (value_type) == TYPE_CODE_ARRAY)
+ && len > 4)
+ offset = 0;
+ else
+ offset = container_len - len;
+ sp -= container_len;
+ write_memory (sp + offset, value_contents_all (args[i]), len);
+ }
+
+ /* Store struct value address. */
+ if (return_method == return_method_struct)
+ {
+ store_unsigned_integer (buf, 4, byte_order, struct_addr);
+ regcache->cooked_write (tdep->struct_value_regnum, buf);
+ }
+
+ /* Store return address. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, byte_order, bp_addr);
+ write_memory (sp, buf, 4);
+
+ /* Finally, update the stack pointer... */
+ store_unsigned_integer (buf, 4, byte_order, sp);
+ regcache->cooked_write (M68K_SP_REGNUM, buf);
+
+ /* ...and fake a frame pointer. */
+ regcache->cooked_write (M68K_FP_REGNUM, buf);
+
+ /* DWARF2/GCC uses the stack address *before* the function call as a
+ frame's CFA. */
+ return sp + 8;
+}
+
+/* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */
+
+static int
+m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num)
+{
+ if (num < 8)
+ /* d0..7 */
+ return (num - 0) + M68K_D0_REGNUM;
+ else if (num < 16)
+ /* a0..7 */
+ return (num - 8) + M68K_A0_REGNUM;
+ else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present)
+ /* fp0..7 */
+ return (num - 16) + M68K_FP0_REGNUM;
+ else if (num == 25)
+ /* pc */
+ return M68K_PC_REGNUM;
+ else
+ return -1;
+}
+
+\f
+struct m68k_frame_cache
+{
+ /* Base address. */
+ CORE_ADDR base;
+ CORE_ADDR sp_offset;
+ CORE_ADDR pc;
- A link instruction, long form:
+ /* Saved registers. */
+ CORE_ADDR saved_regs[M68K_NUM_REGS];
+ CORE_ADDR saved_sp;
- link.l %fp,&F%1 480e XXXX XXXX
+ /* Stack space reserved for local variables. */
+ long locals;
+};
- A movm instruction to preserve integer regs:
+/* Allocate and initialize a frame cache. */
- movm.l &M%1,(4,%sp) 48ef XXXX XXXX
+static struct m68k_frame_cache *
+m68k_alloc_frame_cache (void)
+{
+ struct m68k_frame_cache *cache;
+ int i;
- A fmovm instruction to preserve float regs:
+ cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache);
- fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
+ /* Base address. */
+ cache->base = 0;
+ cache->sp_offset = -4;
+ cache->pc = 0;
- Some profiling setup code (FIXME, not recognized yet):
+ /* Saved registers. We initialize these to -1 since zero is a valid
+ offset (that's where %fp is supposed to be stored). */
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ cache->saved_regs[i] = -1;
- lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
- bsr _mcount 61ff XXXX XXXX
+ /* Frameless until proven otherwise. */
+ cache->locals = -1;
- */
+ return cache;
+}
-#define P_LINK_L 0x480e
-#define P_LINK_W 0x4e56
-#define P_MOV_L 0x207c
-#define P_JSR 0x4eb9
-#define P_BSR 0x61ff
-#define P_LEA_L 0x43fb
-#define P_MOVM_L 0x48ef
-#define P_FMOVM 0xf237
-#define P_TRAP 0x4e40
+/* Check whether PC points at a code that sets up a new stack frame.
+ If so, it updates CACHE and returns the address of the first
+ instruction after the sequence that sets removes the "hidden"
+ argument from the stack or CURRENT_PC, whichever is smaller.
+ Otherwise, return PC. */
-CORE_ADDR
-m68k_skip_prologue (ip)
-CORE_ADDR ip;
+static CORE_ADDR
+m68k_analyze_frame_setup (struct gdbarch *gdbarch,
+ CORE_ADDR pc, CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
{
- register CORE_ADDR limit;
- struct symtab_and_line sal;
- register int op;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int op;
- /* Find out if there is a known limit for the extent of the prologue.
- If so, ensure we don't go past it. If not, assume "infinity". */
+ if (pc >= current_pc)
+ return current_pc;
- sal = find_pc_line (ip, 0);
- limit = (sal.end) ? sal.end : (CORE_ADDR) ~0;
+ op = read_memory_unsigned_integer (pc, 2, byte_order);
- while (ip < limit)
+ if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP)
{
- op = read_memory_integer (ip, 2);
- op &= 0xFFFF;
-
- if (op == P_LINK_W)
+ cache->saved_regs[M68K_FP_REGNUM] = 0;
+ cache->sp_offset += 4;
+ if (op == P_LINKW_FP)
{
- ip += 4; /* Skip link.w */
+ /* link.w %fp, #-N */
+ /* link.w %fp, #0; adda.l #-N, %sp */
+ cache->locals = -read_memory_integer (pc + 2, 2, byte_order);
+
+ if (pc + 4 < current_pc && cache->locals == 0)
+ {
+ op = read_memory_unsigned_integer (pc + 4, 2, byte_order);
+ if (op == P_ADDAL_SP)
+ {
+ cache->locals = read_memory_integer (pc + 6, 4, byte_order);
+ return pc + 10;
+ }
+ }
+
+ return pc + 4;
}
- else if (op == P_LINK_L)
+ else if (op == P_LINKL_FP)
{
- ip += 6; /* Skip link.l */
+ /* link.l %fp, #-N */
+ cache->locals = -read_memory_integer (pc + 2, 4, byte_order);
+ return pc + 6;
}
- else if (op == P_MOVM_L)
- {
- ip += 6; /* Skip movm.l */
- }
- else if (op == P_FMOVM)
+ else
{
- ip += 10; /* Skip fmovm */
+ /* pea (%fp); movea.l %sp, %fp */
+ cache->locals = 0;
+
+ if (pc + 2 < current_pc)
+ {
+ op = read_memory_unsigned_integer (pc + 2, 2, byte_order);
+
+ if (op == P_MOVEAL_SP_FP)
+ {
+ /* move.l %sp, %fp */
+ return pc + 4;
+ }
+ }
+
+ return pc + 2;
}
- else
+ }
+ else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP)
+ {
+ /* subq.[wl] #N,%sp */
+ /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */
+ cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9;
+ if (pc + 2 < current_pc)
{
- break; /* Found unknown code, bail out. */
+ op = read_memory_unsigned_integer (pc + 2, 2, byte_order);
+ if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP)
+ {
+ cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9;
+ return pc + 4;
+ }
}
+ return pc + 2;
}
- return (ip);
+ else if (op == P_ADDAW_SP || op == P_LEA_SP_SP)
+ {
+ /* adda.w #-N,%sp */
+ /* lea (-N,%sp),%sp */
+ cache->locals = -read_memory_integer (pc + 2, 2, byte_order);
+ return pc + 4;
+ }
+ else if (op == P_ADDAL_SP)
+ {
+ /* adda.l #-N,%sp */
+ cache->locals = -read_memory_integer (pc + 2, 4, byte_order);
+ return pc + 6;
+ }
+
+ return pc;
}
-#ifdef USE_PROC_FS /* Target dependent support for /proc */
+/* Check whether PC points at code that saves registers on the stack.
+ If so, it updates CACHE and returns the address of the first
+ instruction after the register saves or CURRENT_PC, whichever is
+ smaller. Otherwise, return PC. */
-#include <sys/procfs.h>
+static CORE_ADDR
+m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc,
+ CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-/* The /proc interface divides the target machine's register set up into
- two different sets, the general register set (gregset) and the floating
- point register set (fpregset). For each set, there is an ioctl to get
- the current register set and another ioctl to set the current values.
+ if (cache->locals >= 0)
+ {
+ CORE_ADDR offset;
+ int op;
+ int i, mask, regno;
- The actual structure passed through the ioctl interface is, of course,
- naturally machine dependent, and is different for each set of registers.
- For the m68k for example, the general register set is typically defined
- by:
+ offset = -4 - cache->locals;
+ while (pc < current_pc)
+ {
+ op = read_memory_unsigned_integer (pc, 2, byte_order);
+ if (op == P_FMOVEMX_SP
+ && gdbarch_tdep (gdbarch)->fpregs_present)
+ {
+ /* fmovem.x REGS,-(%sp) */
+ op = read_memory_unsigned_integer (pc + 2, 2, byte_order);
+ if ((op & 0xff00) == 0xe000)
+ {
+ mask = op & 0xff;
+ for (i = 0; i < 16; i++, mask >>= 1)
+ {
+ if (mask & 1)
+ {
+ cache->saved_regs[i + M68K_FP0_REGNUM] = offset;
+ offset -= 12;
+ }
+ }
+ pc += 4;
+ }
+ else
+ break;
+ }
+ else if ((op & 0177760) == P_MOVEL_SP)
+ {
+ /* move.l %R,-(%sp) */
+ regno = op & 017;
+ cache->saved_regs[regno] = offset;
+ offset -= 4;
+ pc += 2;
+ }
+ else if (op == P_MOVEML_SP)
+ {
+ /* movem.l REGS,-(%sp) */
+ mask = read_memory_unsigned_integer (pc + 2, 2, byte_order);
+ for (i = 0; i < 16; i++, mask >>= 1)
+ {
+ if (mask & 1)
+ {
+ cache->saved_regs[15 - i] = offset;
+ offset -= 4;
+ }
+ }
+ pc += 4;
+ }
+ else
+ break;
+ }
+ }
- typedef int gregset_t[18];
+ return pc;
+}
- #define R_D0 0
- ...
- #define R_PS 17
- and the floating point set by:
+/* Do a full analysis of the prologue at PC and update CACHE
+ accordingly. Bail out early if CURRENT_PC is reached. Return the
+ address where the analysis stopped.
- typedef struct fpregset {
- int f_pcr;
- int f_psr;
- int f_fpiaddr;
- int f_fpregs[8][3]; (8 regs, 96 bits each)
- } fpregset_t;
+ We handle all cases that can be generated by gcc.
- These routines provide the packing and unpacking of gregset_t and
- fpregset_t formatted data.
+ For allocating a stack frame:
- */
+ link.w %a6,#-N
+ link.l %a6,#-N
+ pea (%fp); move.l %sp,%fp
+ link.w %a6,#0; add.l #-N,%sp
+ subq.l #N,%sp
+ subq.w #N,%sp
+ subq.w #8,%sp; subq.w #N-8,%sp
+ add.w #-N,%sp
+ lea (-N,%sp),%sp
+ add.l #-N,%sp
+ For saving registers:
-/* Given a pointer to a general register set in /proc format (gregset_t *),
- unpack the register contents and supply them as gdb's idea of the current
- register values. */
+ fmovem.x REGS,-(%sp)
+ move.l R1,-(%sp)
+ move.l R1,-(%sp); move.l R2,-(%sp)
+ movem.l REGS,-(%sp)
-void
-supply_gregset (gregsetp)
-gregset_t *gregsetp;
+ For setting up the PIC register:
+
+ lea (%pc,N),%a5
+
+ */
+
+static CORE_ADDR
+m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc,
+ CORE_ADDR current_pc, struct m68k_frame_cache *cache)
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ unsigned int op;
+
+ pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache);
+ pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache);
+ if (pc >= current_pc)
+ return current_pc;
- for (regi = 0 ; regi < R_PC ; regi++)
+ /* Check for GOT setup. */
+ op = read_memory_unsigned_integer (pc, 4, byte_order);
+ if (op == P_LEA_PC_A5)
{
- supply_register (regi, (char *) (regp + regi));
+ /* lea (%pc,N),%a5 */
+ return pc + 8;
}
- supply_register (PS_REGNUM, (char *) (regp + R_PS));
- supply_register (PC_REGNUM, (char *) (regp + R_PC));
+
+ return pc;
}
-void
-fill_gregset (gregsetp, regno)
-gregset_t *gregsetp;
-int regno;
+/* Return PC of first real instruction. */
+
+static CORE_ADDR
+m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
{
- register int regi;
- register greg_t *regp = (greg_t *) gregsetp;
- extern char registers[];
+ struct m68k_frame_cache cache;
+ CORE_ADDR pc;
+
+ cache.locals = -1;
+ pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache);
+ if (cache.locals < 0)
+ return start_pc;
+ return pc;
+}
- for (regi = 0 ; regi < R_PC ; regi++)
- {
- if ((regno == -1) || (regno == regi))
- {
- *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)];
- }
- }
- if ((regno == -1) || (regno == PS_REGNUM))
- {
- *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
- }
- if ((regno == -1) || (regno == PC_REGNUM))
+static CORE_ADDR
+m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ gdb_byte buf[8];
+
+ frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf);
+ return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr);
+}
+\f
+/* Normal frames. */
+
+static struct m68k_frame_cache *
+m68k_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct m68k_frame_cache *cache;
+ gdb_byte buf[4];
+ int i;
+
+ if (*this_cache)
+ return (struct m68k_frame_cache *) *this_cache;
+
+ cache = m68k_alloc_frame_cache ();
+ *this_cache = cache;
+
+ /* In principle, for normal frames, %fp holds the frame pointer,
+ which holds the base address for the current stack frame.
+ However, for functions that don't need it, the frame pointer is
+ optional. For these "frameless" functions the frame pointer is
+ actually the frame pointer of the calling frame. Signal
+ trampolines are just a special case of a "frameless" function.
+ They (usually) share their frame pointer with the frame that was
+ in progress when the signal occurred. */
+
+ get_frame_register (this_frame, M68K_FP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4, byte_order);
+ if (cache->base == 0)
+ return cache;
+
+ /* For normal frames, %pc is stored at 4(%fp). */
+ cache->saved_regs[M68K_PC_REGNUM] = 4;
+
+ cache->pc = get_frame_func (this_frame);
+ if (cache->pc != 0)
+ m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc,
+ get_frame_pc (this_frame), cache);
+
+ if (cache->locals < 0)
{
- *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+ /* We didn't find a valid frame, which means that CACHE->base
+ currently holds the frame pointer for our calling frame. If
+ we're at the start of a function, or somewhere half-way its
+ prologue, the function's frame probably hasn't been fully
+ setup yet. Try to reconstruct the base address for the stack
+ frame by looking at the stack pointer. For truly "frameless"
+ functions this might work too. */
+
+ get_frame_register (this_frame, M68K_SP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4, byte_order)
+ + cache->sp_offset;
}
+
+ /* Now that we have the base address for the stack frame we can
+ calculate the value of %sp in the calling frame. */
+ cache->saved_sp = cache->base + 8;
+
+ /* Adjust all the saved registers such that they contain addresses
+ instead of offsets. */
+ for (i = 0; i < M68K_NUM_REGS; i++)
+ if (cache->saved_regs[i] != -1)
+ cache->saved_regs[i] += cache->base;
+
+ return cache;
}
-#if defined (FP0_REGNUM)
+static void
+m68k_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache);
-/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), unpack the register contents and supply them as gdb's
- idea of the current floating point register values. */
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
-void
-supply_fpregset (fpregsetp)
-fpregset_t *fpregsetp;
+ /* See the end of m68k_push_dummy_call. */
+ *this_id = frame_id_build (cache->base + 8, cache->pc);
+}
+
+static struct value *
+m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache,
+ int regnum)
{
- register int regi;
- char *from;
-
- for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
+ struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache);
+
+ gdb_assert (regnum >= 0);
+
+ if (regnum == M68K_SP_REGNUM && cache->saved_sp)
+ return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp);
+
+ if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1)
+ return frame_unwind_got_memory (this_frame, regnum,
+ cache->saved_regs[regnum]);
+
+ return frame_unwind_got_register (this_frame, regnum, regnum);
+}
+
+static const struct frame_unwind m68k_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ m68k_frame_this_id,
+ m68k_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+\f
+static CORE_ADDR
+m68k_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+ struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache);
+
+ return cache->base;
+}
+
+static const struct frame_base m68k_frame_base =
+{
+ &m68k_frame_unwind,
+ m68k_frame_base_address,
+ m68k_frame_base_address,
+ m68k_frame_base_address
+};
+
+static struct frame_id
+m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ CORE_ADDR fp;
+
+ fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM);
+
+ /* See the end of m68k_push_dummy_call. */
+ return frame_id_build (fp + 8, get_frame_pc (this_frame));
+}
+\f
+
+/* Figure out where the longjmp will land. Slurp the args out of the stack.
+ We expect the first arg to be a pointer to the jmp_buf structure from which
+ we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
+ This routine returns true on success. */
+
+static int
+m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
+{
+ gdb_byte *buf;
+ CORE_ADDR sp, jb_addr;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ if (tdep->jb_pc < 0)
{
- from = (char *) &(fpregsetp -> f_fpregs[regi-FP0_REGNUM][0]);
- supply_register (regi, from);
+ internal_error (__FILE__, __LINE__,
+ _("m68k_get_longjmp_target: not implemented"));
+ return 0;
}
- supply_register (FPC_REGNUM, (char *) &(fpregsetp -> f_pcr));
- supply_register (FPS_REGNUM, (char *) &(fpregsetp -> f_psr));
- supply_register (FPI_REGNUM, (char *) &(fpregsetp -> f_fpiaddr));
+
+ buf = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
+ sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch));
+
+ if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */
+ buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT))
+ return 0;
+
+ jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch)
+ / TARGET_CHAR_BIT, byte_order);
+
+ if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf,
+ gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT),
+ byte_order)
+ return 0;
+
+ *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch)
+ / TARGET_CHAR_BIT, byte_order);
+ return 1;
+}
+\f
+
+/* This is the implementation of gdbarch method
+ return_in_first_hidden_param_p. */
+
+static int
+m68k_return_in_first_hidden_param_p (struct gdbarch *gdbarch,
+ struct type *type)
+{
+ return 0;
}
-/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), update the register specified by REGNO from gdb's idea
- of the current floating point register set. If REGNO is -1, update
- them all. */
+/* System V Release 4 (SVR4). */
void
-fill_fpregset (fpregsetp, regno)
-fpregset_t *fpregsetp;
-int regno;
+m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- int regi;
- char *to;
- char *from;
- extern char registers[];
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* SVR4 uses a different calling convention. */
+ set_gdbarch_return_value (gdbarch, m68k_svr4_return_value);
+
+ /* SVR4 uses %a0 instead of %a1. */
+ tdep->struct_value_regnum = M68K_A0_REGNUM;
+}
+\f
+
+/* Function: m68k_gdbarch_init
+ Initializer function for the m68k gdbarch vector.
+ Called by gdbarch. Sets up the gdbarch vector(s) for this target. */
- for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
+static struct gdbarch *
+m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch_tdep *tdep = NULL;
+ struct gdbarch *gdbarch;
+ struct gdbarch_list *best_arch;
+ struct tdesc_arch_data *tdesc_data = NULL;
+ int i;
+ enum m68k_flavour flavour = m68k_no_flavour;
+ int has_fp = 1;
+ const struct floatformat **long_double_format = floatformats_m68881_ext;
+
+ /* Check any target description for validity. */
+ if (tdesc_has_registers (info.target_desc))
{
- if ((regno == -1) || (regno == regi))
+ const struct tdesc_feature *feature;
+ int valid_p;
+
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.m68k.core");
+
+ if (feature == NULL)
{
- from = (char *) ®isters[REGISTER_BYTE (regi)];
- to = (char *) &(fpregsetp -> f_fpregs[regi-FP0_REGNUM][0]);
- bcopy (from, to, REGISTER_RAW_SIZE (regi));
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.coldfire.core");
+ if (feature != NULL)
+ flavour = m68k_coldfire_flavour;
}
+
+ if (feature == NULL)
+ {
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.fido.core");
+ if (feature != NULL)
+ flavour = m68k_fido_flavour;
+ }
+
+ if (feature == NULL)
+ return NULL;
+
+ tdesc_data = tdesc_data_alloc ();
+
+ valid_p = 1;
+ for (i = 0; i <= M68K_PC_REGNUM; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ m68k_register_names[i]);
+
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.coldfire.fp");
+ if (feature != NULL)
+ {
+ valid_p = 1;
+ for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ m68k_register_names[i]);
+ if (!valid_p)
+ {
+ tdesc_data_cleanup (tdesc_data);
+ return NULL;
+ }
+ }
+ else
+ has_fp = 0;
}
- if ((regno == -1) || (regno == FPC_REGNUM))
+
+ /* The mechanism for returning floating values from function
+ and the type of long double depend on whether we're
+ on ColdFire or standard m68k. */
+
+ if (info.bfd_arch_info && info.bfd_arch_info->mach != 0)
{
- fpregsetp -> f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)];
+ const bfd_arch_info_type *coldfire_arch =
+ bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv);
+
+ if (coldfire_arch
+ && ((*info.bfd_arch_info->compatible)
+ (info.bfd_arch_info, coldfire_arch)))
+ flavour = m68k_coldfire_flavour;
}
- if ((regno == -1) || (regno == FPS_REGNUM))
+
+ /* If there is already a candidate, use it. */
+ for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
+ best_arch != NULL;
+ best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
{
- fpregsetp -> f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)];
+ if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour)
+ continue;
+
+ if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present)
+ continue;
+
+ break;
}
- if ((regno == -1) || (regno == FPI_REGNUM))
+
+ if (best_arch != NULL)
{
- fpregsetp -> f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)];
+ if (tdesc_data != NULL)
+ tdesc_data_cleanup (tdesc_data);
+ return best_arch->gdbarch;
}
-}
-#endif /* defined (FP0_REGNUM) */
+ tdep = XCNEW (struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
+ tdep->fpregs_present = has_fp;
+ tdep->flavour = flavour;
+
+ if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour)
+ long_double_format = floatformats_ieee_double;
+ set_gdbarch_long_double_format (gdbarch, long_double_format);
+ set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize);
+
+ set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue);
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch, m68k_breakpoint::kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch, m68k_breakpoint::bp_from_kind);
+
+ /* Stack grows down. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ set_gdbarch_frame_align (gdbarch, m68k_frame_align);
+
+ set_gdbarch_believe_pcc_promotion (gdbarch, 1);
+ if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour)
+ set_gdbarch_decr_pc_after_break (gdbarch, 2);
+
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum);
+
+ set_gdbarch_register_type (gdbarch, m68k_register_type);
+ set_gdbarch_register_name (gdbarch, m68k_register_name);
+ set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS);
+ set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM);
+ set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM);
+ set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p);
+ set_gdbarch_register_to_value (gdbarch, m68k_register_to_value);
+ set_gdbarch_value_to_register (gdbarch, m68k_value_to_register);
+
+ if (has_fp)
+ set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM);
+
+ /* Try to figure out if the arch uses floating registers to return
+ floating point values from functions. */
+ if (has_fp)
+ {
+ /* On ColdFire, floating point values are returned in D0. */
+ if (flavour == m68k_coldfire_flavour)
+ tdep->float_return = 0;
+ else
+ tdep->float_return = 1;
+ }
+ else
+ {
+ /* No floating registers, so can't use them for returning values. */
+ tdep->float_return = 0;
+ }
-#endif /* USE_PROC_FS */
+ /* Function call & return. */
+ set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call);
+ set_gdbarch_return_value (gdbarch, m68k_return_value);
+ set_gdbarch_return_in_first_hidden_param_p (gdbarch,
+ m68k_return_in_first_hidden_param_p);
+
+#if defined JB_PC && defined JB_ELEMENT_SIZE
+ tdep->jb_pc = JB_PC;
+ tdep->jb_elt_size = JB_ELEMENT_SIZE;
+#else
+ tdep->jb_pc = -1;
+#endif
+ tdep->struct_value_regnum = M68K_A1_REGNUM;
+ tdep->struct_return = reg_struct_return;
-#ifdef GET_LONGJMP_TARGET
-/* Figure out where the longjmp will land. Slurp the args out of the stack.
- We expect the first arg to be a pointer to the jmp_buf structure from which
- we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
- This routine returns true on success. */
+ /* Frame unwinder. */
+ set_gdbarch_dummy_id (gdbarch, m68k_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc);
-int
-get_longjmp_target(pc)
- CORE_ADDR *pc;
-{
- CORE_ADDR sp, jb_addr;
+ /* Hook in the DWARF CFI frame unwinder. */
+ dwarf2_append_unwinders (gdbarch);
- sp = read_register(SP_REGNUM);
+ frame_base_set_default (gdbarch, &m68k_frame_base);
- if (target_read_memory(sp + SP_ARG0, /* Offset of first arg on stack */
- &jb_addr,
- sizeof(CORE_ADDR)))
- return 0;
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+ /* Now we have tuned the configuration, set a few final things,
+ based on what the OS ABI has told us. */
- SWAP_TARGET_AND_HOST(&jb_addr, sizeof(CORE_ADDR));
+ if (tdep->jb_pc >= 0)
+ set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target);
- if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, pc,
- sizeof(CORE_ADDR)))
- return 0;
+ frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind);
- SWAP_TARGET_AND_HOST(pc, sizeof(CORE_ADDR));
+ if (tdesc_data)
+ tdesc_use_registers (gdbarch, info.target_desc, tdesc_data);
- return 1;
+ return gdbarch;
}
-#endif /* GET_LONGJMP_TARGET */
-/* Immediately after a function call, return the saved pc before the frame
- is setup. We check for the common case of being inside of a system call,
- and if so, we know that Sun pushes the call # on the stack prior to doing
- the trap. */
-CORE_ADDR
-m68k_saved_pc_after_call(frame)
- struct frame_info *frame;
+static void
+m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
{
-#ifdef sun
- int op;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- op = read_memory_integer (frame->pc, 2);
- op &= 0xFFFF;
+ if (tdep == NULL)
+ return;
+}
- if (op == P_TRAP)
- return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
- else
-#endif /* sun */
- return read_memory_integer (read_register (SP_REGNUM), 4);
+void
+_initialize_m68k_tdep (void)
+{
+ gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep);
}
projects / deliverable / binutils-gdb.git / blobdiff