X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fm68k-tdep.c;h=4533d0a7db4a06fdea07bf6641409ae4d1da97c2;hb=1777feb0fea5ec350a86eecf81f71ccc60d4cf6f;hp=aabb13ab597166f08555289d7cde0e29788a9ae0;hpb=b1e29e332aca04fd8b4b795d1c2ee1eb8fa7ba42;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/m68k-tdep.c b/gdb/m68k-tdep.c
index aabb13ab59..4533d0a7db 100644
--- a/gdb/m68k-tdep.c
+++ b/gdb/m68k-tdep.c
@@ -1,13 +1,14 @@
-/* Target dependent code for the Motorola 68000 series.
- Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001,
- 2002, 2003
+/* Target-dependent code for the Motorola 68000 series.
+
+ Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001,
+ 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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,
@@ -16,19 +17,25 @@
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 . */
#include "defs.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 "gdb_string.h"
+#include "gdb_assert.h"
#include "inferior.h"
#include "regcache.h"
#include "arch-utils.h"
+#include "osabi.h"
+#include "dis-asm.h"
+#include "target-descriptions.h"
#include "m68k-tdep.h"
@@ -36,96 +43,75 @@
#define P_LINKL_FP 0x480e
#define P_LINKW_FP 0x4e56
#define P_PEA_FP 0x4856
-#define P_MOVL_SP_FP 0x2c4f
-#define P_MOVL 0x207c
-#define P_JSR 0x4eb9
-#define P_BSR 0x61ff
-#define P_LEAL 0x43fb
-#define P_MOVML 0x48ef
-#define P_FMOVM 0xf237
-#define P_TRAP 0x4e40
-
-
-#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
-#define REGISTER_BYTES_NOFP (16*4 + 8)
-
-#define NUM_FREGS (NUM_REGS-24)
+#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)
-/* This was determined by experimentation on hp300 BSD 4.3. Perhaps
- it corresponds to some offset in /usr/include/sys/user.h or
- something like that. Using some system include file would
- have the advantage of probably being more robust in the face
- of OS upgrades, but the disadvantage of being wrong for
- cross-debugging. */
-
-#define SIG_PC_FP_OFFSET 530
-
-#define TARGET_M68K
-
-
#if !defined (BPT_VECTOR)
#define BPT_VECTOR 0xf
#endif
-#if !defined (REMOTE_BPT_VECTOR)
-#define REMOTE_BPT_VECTOR 1
-#endif
-
-
-void m68k_frame_init_saved_regs (struct frame_info *frame_info);
-
-
-/* gdbarch_breakpoint_from_pc is set to m68k_local_breakpoint_from_pc
- so m68k_remote_breakpoint_from_pc is currently not used. */
-
-const static unsigned char *
-m68k_remote_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+static const gdb_byte *
+m68k_local_breakpoint_from_pc (struct gdbarch *gdbarch,
+ CORE_ADDR *pcptr, int *lenptr)
{
- static unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_BPT_VECTOR)};
+ static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
*lenptr = sizeof (break_insn);
return break_insn;
}
+
-const static unsigned char *
-m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+/* Construct types for ISA-specific registers. */
+static struct type *
+m68k_ps_type (struct gdbarch *gdbarch)
{
- static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
- *lenptr = sizeof (break_insn);
- return break_insn;
-}
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ if (!tdep->m68k_ps_type)
+ {
+ struct type *type;
+
+ type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 4);
+ 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;
+ }
-static int
-m68k_register_bytes_ok (long numbytes)
-{
- return ((numbytes == REGISTER_BYTES_FP)
- || (numbytes == REGISTER_BYTES_NOFP));
+ return tdep->m68k_ps_type;
}
-/* Number of bytes of storage in the actual machine representation
- for register regnum. On the 68000, all regs are 4 bytes
- except the floating point regs which are 12 bytes. */
-/* Note that the unsigned cast here forces the result of the
- subtraction to very high positive values if regnum < FP0_REGNUM */
-
-static int
-m68k_register_raw_size (int regnum)
+static struct type *
+m68881_ext_type (struct gdbarch *gdbarch)
{
- return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4);
-}
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-/* Number of bytes of storage in the program's representation
- for register regnum. On the 68000, all regs are 4 bytes
- except the floating point regs which are 12-byte long doubles. */
+ if (!tdep->m68881_ext_type)
+ tdep->m68881_ext_type
+ = arch_float_type (gdbarch, -1, "builtin_type_m68881_ext",
+ floatformats_m68881_ext);
-static int
-m68k_register_virtual_size (int regnum)
-{
- return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4);
+ return tdep->m68881_ext_type;
}
/* Return the GDB type object for the "standard" data type of data in
@@ -137,827 +123,938 @@ m68k_register_virtual_size (int regnum)
address. */
static struct type *
-m68k_register_virtual_type (int regnum)
+m68k_register_type (struct gdbarch *gdbarch, int regnum)
{
- if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7)
- return builtin_type_m68881_ext;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (tdep->fpregs_present)
+ {
+ 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_FPI_REGNUM || regnum == PC_REGNUM)
- return builtin_type_void_func_ptr;
+ if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM)
+ return builtin_type (gdbarch)->builtin_int32;
+ }
+ else
+ {
+ if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM)
+ return builtin_type (gdbarch)->builtin_int0;
+ }
- if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM
- || regnum == PS_REGNUM)
- return builtin_type_int32;
+ 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_void_data_ptr;
+ return builtin_type (gdbarch)->builtin_data_ptr;
- return builtin_type_int32;
-}
+ if (regnum == M68K_PS_REGNUM)
+ return m68k_ps_type (gdbarch);
-/* Function: m68k_register_name
- Returns the name of the standard m68k register regnum. */
+ return builtin_type (gdbarch)->builtin_int32;
+}
-static const char *
-m68k_register_name (int regnum)
-{
- static char *register_names[] = {
+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", "fpcode", "fpflags"
+ "fpcontrol", "fpstatus", "fpiaddr"
};
- if (regnum < 0 ||
- regnum >= sizeof (register_names) / sizeof (register_names[0]))
- internal_error (__FILE__, __LINE__,
- "m68k_register_name: illegal register number %d", regnum);
- else
- return register_names[regnum];
-}
-
-/* Stack must be kept short aligned when doing function calls. */
+/* Function: m68k_register_name
+ Returns the name of the standard m68k register regnum. */
-static CORE_ADDR
-m68k_stack_align (CORE_ADDR addr)
+static const char *
+m68k_register_name (struct gdbarch *gdbarch, int regnum)
{
- return ((addr + 1) & ~1);
+ 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];
}
-
-/* Index within `registers' of the first byte of the space for
- register regnum. */
+
+/* Return nonzero if a value of type TYPE stored in register REGNUM
+ needs any special handling. */
static int
-m68k_register_byte (int regnum)
+m68k_convert_register_p (struct gdbarch *gdbarch, int regnum, struct type *type)
{
- if (regnum >= M68K_FPC_REGNUM)
- return (((regnum - M68K_FPC_REGNUM) * 4) + 168);
- else if (regnum >= FP0_REGNUM)
- return (((regnum - FP0_REGNUM) * 12) + 72);
- else
- return (regnum * 4);
+ if (!gdbarch_tdep (gdbarch)->fpregs_present)
+ return 0;
+ return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7
+ && type != register_type (gdbarch, M68K_FP0_REGNUM));
}
-/* Store the address of the place in which to copy the structure the
- subroutine will return. This is called from call_function. */
+/* Read a value of type TYPE from register REGNUM in frame FRAME, and
+ return its contents in TO. */
static void
-m68k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+m68k_register_to_value (struct frame_info *frame, int regnum,
+ struct type *type, gdb_byte *to)
{
- write_register (M68K_A1_REGNUM, addr);
+ gdb_byte from[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 floating-point register value "
+ "to non-floating-point type."));
+ return;
+ }
+
+ /* Convert to TYPE. */
+ get_frame_register (frame, regnum, from);
+ convert_typed_floating (from, fpreg_type, to, type);
}
-/* Extract from an array regbuf containing the (raw) register state
- a function return value of type type, and copy that, in virtual format,
- into valbuf. This is assuming that floating point values are returned
- as doubles in d0/d1. */
+/* Write the contents FROM of a value of type TYPE into register
+ REGNUM in frame FRAME. */
static void
-m68k_deprecated_extract_return_value (struct type *type, char *regbuf,
- char *valbuf)
+m68k_value_to_register (struct frame_info *frame, int regnum,
+ struct type *type, const gdb_byte *from)
{
- int offset = 0;
- int typeLength = TYPE_LENGTH (type);
-
- if (typeLength < 4)
- offset = 4 - typeLength;
+ gdb_byte to[M68K_MAX_REGISTER_SIZE];
+ struct type *fpreg_type = register_type (get_frame_arch (frame),
+ M68K_FP0_REGNUM);
- memcpy (valbuf, regbuf + offset, typeLength);
-}
+ /* 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;
+ }
-static CORE_ADDR
-m68k_deprecated_extract_struct_value_address (char *regbuf)
-{
- return (*(CORE_ADDR *) (regbuf));
+ /* Convert from TYPE. */
+ convert_typed_floating (from, type, to, fpreg_type);
+ put_frame_register (frame, regnum, to);
}
-/* Write into appropriate registers a function return value
- of type TYPE, given in virtual format. Assumes floats are passed
- in d0/d1. */
+
+/* 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) instroduces 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_store_return_value (struct type *type, char *valbuf)
+m68k_extract_return_value (struct type *type, struct regcache *regcache,
+ gdb_byte *valbuf)
{
- deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (type));
-}
-
-/* Describe the pointer in each stack frame to the previous stack frame
- (its caller). */
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
-/* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and produces
- the frame's chain-pointer. In the case of the 68000, the frame's
- nominal address is the address of a 4-byte word containing the
- calling frame's address. */
-
-/* If we are chaining from sigtramp, then manufacture a sigtramp frame
- (which isn't really on the stack. I'm not sure this is right for anything
- but BSD4.3 on an hp300. */
-
-static CORE_ADDR
-m68k_frame_chain (struct frame_info *thisframe)
-{
- if (get_frame_type (thisframe) == SIGTRAMP_FRAME)
- return get_frame_base (thisframe);
- else if (!inside_entry_file (get_frame_pc (thisframe)))
- return read_memory_unsigned_integer (get_frame_base (thisframe), 4);
+ if (len <= 4)
+ {
+ regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (4 - len), len);
+ }
+ else if (len <= 8)
+ {
+ regcache_raw_read (regcache, M68K_D0_REGNUM, buf);
+ memcpy (valbuf, buf + (8 - len), len - 4);
+ regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4));
+ }
else
- return 0;
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value of %d bytes long."), len);
}
-/* A function that tells us whether the function invocation represented
- by fi does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
-
-static int
-m68k_frameless_function_invocation (struct frame_info *fi)
+static void
+m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache,
+ gdb_byte *valbuf)
{
- if (get_frame_type (fi) == SIGTRAMP_FRAME)
- return 0;
- else
- return frameless_look_for_prologue (fi);
-}
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-static CORE_ADDR
-m68k_frame_saved_pc (struct frame_info *frame)
-{
- if (get_frame_type (frame) == SIGTRAMP_FRAME)
+ if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT)
{
- if (get_next_frame (frame))
- return read_memory_unsigned_integer (get_frame_base (get_next_frame (frame))
- + SIG_PC_FP_OFFSET, 4);
- else
- return read_memory_unsigned_integer (read_register (SP_REGNUM)
- + SIG_PC_FP_OFFSET - 8, 4);
+ struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM);
+ regcache_raw_read (regcache, M68K_FP0_REGNUM, buf);
+ convert_typed_floating (buf, fpreg_type, valbuf, type);
}
+ else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4)
+ regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf);
else
- return read_memory_unsigned_integer (get_frame_base (frame) + 4, 4);
+ m68k_extract_return_value (type, regcache, valbuf);
}
+/* Write a function return value of TYPE from VALBUF into REGCACHE. */
-/* The only reason this is here is the tm-altos.h reference below. It
- was moved back here from tm-m68k.h. FIXME? */
-
-extern CORE_ADDR
-altos_skip_prologue (CORE_ADDR pc)
-{
- register int op = read_memory_unsigned_integer (pc, 2);
- if (op == P_LINKW_FP)
- pc += 4; /* Skip link #word */
- else if (op == P_LINKL_FP)
- pc += 6; /* Skip link #long */
- /* Not sure why branches are here. */
- /* From tm-altos.h */
- else if (op == 0060000)
- pc += 4; /* Skip bra #word */
- else if (op == 00600377)
- pc += 6; /* skip bra #long */
- else if ((op & 0177400) == 0060000)
- pc += 2; /* skip bra #char */
- return pc;
-}
-
-int
-delta68_in_sigtramp (CORE_ADDR pc, char *name)
+static void
+m68k_store_return_value (struct type *type, struct regcache *regcache,
+ const gdb_byte *valbuf)
{
- if (name != NULL)
- return strcmp (name, "_sigcode") == 0;
- else
- return 0;
-}
+ int len = TYPE_LENGTH (type);
-CORE_ADDR
-delta68_frame_args_address (struct frame_info *frame_info)
-{
- /* we assume here that the only frameless functions are the system calls
- or other functions who do not put anything on the stack. */
- if (get_frame_type (frame_info) == SIGTRAMP_FRAME)
- return get_frame_base (frame_info) + 12;
- else if (frameless_look_for_prologue (frame_info))
+ if (len <= 4)
+ regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf);
+ else if (len <= 8)
{
- /* Check for an interrupted system call */
- if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME))
- return get_frame_base (get_next_frame (frame_info)) + 16;
- else
- return get_frame_base (frame_info) + 4;
+ regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len,
+ len - 4, valbuf);
+ regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4));
}
else
- return get_frame_base (frame_info);
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value of %d bytes long."), len);
}
-CORE_ADDR
-delta68_frame_saved_pc (struct frame_info *frame_info)
+static void
+m68k_svr4_store_return_value (struct type *type, struct regcache *regcache,
+ const gdb_byte *valbuf)
{
- return read_memory_unsigned_integer (delta68_frame_args_address (frame_info)
- + 4, 4);
-}
-
-/* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
+ int len = TYPE_LENGTH (type);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-int
-isi_frame_num_args (struct frame_info *fi)
-{
- int val;
- CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi);
- int insn = read_memory_unsigned_integer (pc, 2);
- val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
- val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
+ if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT)
{
- val = (insn >> 9) & 7;
- if (val == 0)
- val = 8;
+ struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM);
+ gdb_byte buf[M68K_MAX_REGISTER_SIZE];
+ convert_typed_floating (valbuf, type, buf, fpreg_type);
+ regcache_raw_write (regcache, M68K_FP0_REGNUM, buf);
}
- else if (insn == 0157774) /* addal #WW, sp */
- val = read_memory_integer (pc + 2, 4);
- val >>= 2;
- return val;
-}
-
-int
-delta68_frame_num_args (struct frame_info *fi)
-{
- int val;
- CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi);
- int insn = read_memory_unsigned_integer (pc, 2);
- val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
- val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
+ else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4)
{
- val = (insn >> 9) & 7;
- if (val == 0)
- val = 8;
+ regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf);
+ regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf);
}
- else if (insn == 0157774) /* addal #WW, sp */
- val = read_memory_integer (pc + 2, 4);
- val >>= 2;
- return val;
+ else
+ m68k_store_return_value (type, regcache, valbuf);
}
-int
-news_frame_num_args (struct frame_info *fi)
+/* Return non-zero if TYPE, which is assumed to be a structure or
+ union type, should be returned in registers for architecture
+ GDBARCH. */
+
+static int
+m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type)
{
- int val;
- CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi);
- int insn = read_memory_unsigned_integer (pc, 2);
- val = 0;
- if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
- val = read_memory_integer (pc + 2, 2);
- else if ((insn & 0170777) == 0050217 /* addql #N, sp */
- || (insn & 0170777) == 0050117) /* addqw */
- {
- val = (insn >> 9) & 7;
- if (val == 0)
- val = 8;
- }
- else if (insn == 0157774) /* addal #WW, sp */
- val = read_memory_integer (pc + 2, 4);
- val >>= 2;
- return val;
-}
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum type_code code = TYPE_CODE (type);
+ int len = TYPE_LENGTH (type);
-/* Insert the specified number of args and function address
- into a call sequence of the above form stored at DUMMYNAME.
- We use the BFD routines to store a big-endian value of known size. */
+ gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION);
-void
-m68k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
- struct value **args, struct type *type, int gcc_p)
-{
- bfd_putb32 (fun, (unsigned char *) dummy + DEPRECATED_CALL_DUMMY_START_OFFSET + 2);
- bfd_putb32 (nargs * 4,
- (unsigned char *) dummy + DEPRECATED_CALL_DUMMY_START_OFFSET + 8);
-}
+ if (tdep->struct_return == pcc_struct_return)
+ return 0;
+ return (len == 1 || len == 2 || len == 4 || len == 8);
+}
-/* Push an empty stack frame, to record the current PC, etc. */
+/* 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. */
-void
-m68k_push_dummy_frame (void)
+static enum return_value_convention
+m68k_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int regnum;
- char raw_buffer[12];
-
- sp = push_word (sp, read_register (PC_REGNUM));
- sp = push_word (sp, read_register (DEPRECATED_FP_REGNUM));
- write_register (DEPRECATED_FP_REGNUM, sp);
+ enum type_code code = TYPE_CODE (type);
- /* Always save the floating-point registers, whether they exist on
- this target or not. */
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ /* GCC returns a `long double' in memory too. */
+ if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION)
+ && !m68k_reg_struct_return_p (gdbarch, type))
+ || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12))
{
- deprecated_read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
- sp = push_bytes (sp, raw_buffer, 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. */
- for (regnum = DEPRECATED_FP_REGNUM - 1; regnum >= 0; regnum--)
- {
- sp = push_word (sp, read_register (regnum));
+ if (readbuf)
+ {
+ ULONGEST addr;
+
+ regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
+ }
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
- sp = push_word (sp, read_register (PS_REGNUM));
- write_register (SP_REGNUM, sp);
-}
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
+ if (readbuf)
+ m68k_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ m68k_store_return_value (type, regcache, writebuf);
-void
-m68k_pop_frame (void)
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+static enum return_value_convention
+m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
{
- register struct frame_info *frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- char raw_buffer[12];
-
- fp = get_frame_base (frame);
- m68k_frame_init_saved_regs (frame);
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
- {
- if (get_frame_saved_regs (frame)[regnum])
- {
- read_memory (get_frame_saved_regs (frame)[regnum], raw_buffer, 12);
- deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer,
- 12);
- }
- }
- for (regnum = DEPRECATED_FP_REGNUM - 1; regnum >= 0; regnum--)
+ enum type_code code = TYPE_CODE (type);
+
+ if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION)
+ && !m68k_reg_struct_return_p (gdbarch, type))
{
- if (get_frame_saved_regs (frame)[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 (get_frame_saved_regs (frame)[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 (get_frame_saved_regs (frame)[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 (get_frame_saved_regs (frame)[PS_REGNUM], 4));
+ type = check_typedef (TYPE_FIELD_TYPE (type, 0));
+ return m68k_svr4_return_value (gdbarch, func_type, type, regcache,
+ readbuf, writebuf);
}
- write_register (DEPRECATED_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 ();
-}
-
-/* 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.
+ if (readbuf)
+ m68k_svr4_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ m68k_svr4_store_return_value (type, regcache, writebuf);
- Some instructions which typically may appear in a function
- prologue include:
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
- A link instruction, word form:
+/* Always align the frame to a 4-byte boundary. This is required on
+ coldfire and harmless on the rest. */
- link.w %a6,&0 4e56 XXXX
+static CORE_ADDR
+m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+ /* Align the stack to four bytes. */
+ return sp & ~3;
+}
- A link instruction, long form:
+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, int struct_return,
+ 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;
- link.l %fp,&F%1 480e XXXX XXXX
+ /* 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);
+ }
- A movm instruction to preserve integer regs:
+ /* Store struct value address. */
+ if (struct_return)
+ {
+ store_unsigned_integer (buf, 4, byte_order, struct_addr);
+ regcache_cooked_write (regcache, tdep->struct_value_regnum, buf);
+ }
- movm.l &M%1,(4,%sp) 48ef XXXX XXXX
+ /* Store return address. */
+ sp -= 4;
+ store_unsigned_integer (buf, 4, byte_order, bp_addr);
+ write_memory (sp, buf, 4);
- A fmovm instruction to preserve float regs:
+ /* Finally, update the stack pointer... */
+ store_unsigned_integer (buf, 4, byte_order, sp);
+ regcache_cooked_write (regcache, M68K_SP_REGNUM, buf);
- fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
+ /* ...and fake a frame pointer. */
+ regcache_cooked_write (regcache, M68K_FP_REGNUM, buf);
- Some profiling setup code (FIXME, not recognized yet):
+ /* DWARF2/GCC uses the stack address *before* the function call as a
+ frame's CFA. */
+ return sp + 8;
+}
- lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
- bsr _mcount 61ff XXXX XXXX
+/* 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 gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
+}
-CORE_ADDR
-m68k_skip_prologue (CORE_ADDR ip)
+
+struct m68k_frame_cache
{
- register CORE_ADDR limit;
- struct symtab_and_line sal;
- register int op;
+ /* Base address. */
+ CORE_ADDR base;
+ CORE_ADDR sp_offset;
+ CORE_ADDR pc;
- /* 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". */
+ /* Saved registers. */
+ CORE_ADDR saved_regs[M68K_NUM_REGS];
+ CORE_ADDR saved_sp;
- sal = find_pc_line (ip, 0);
- limit = (sal.end) ? sal.end : (CORE_ADDR) ~0;
+ /* Stack space reserved for local variables. */
+ long locals;
+};
- while (ip < limit)
- {
- op = read_memory_unsigned_integer (ip, 2);
+/* Allocate and initialize a frame cache. */
- if (op == P_LINKW_FP)
- ip += 4; /* Skip link.w */
- else if (op == P_PEA_FP)
- ip += 2; /* Skip pea %fp */
- else if (op == P_MOVL_SP_FP)
- ip += 2; /* Skip move.l %sp, %fp */
- else if (op == P_LINKL_FP)
- ip += 6; /* Skip link.l */
- else if (op == P_MOVML)
- ip += 6; /* Skip movm.l */
- else if (op == P_FMOVM)
- ip += 10; /* Skip fmovm */
- else
- break; /* Found unknown code, bail out. */
- }
- return (ip);
-}
+static struct m68k_frame_cache *
+m68k_alloc_frame_cache (void)
+{
+ struct m68k_frame_cache *cache;
+ int i;
-/* Store the addresses of the saved registers of the frame described by
- FRAME_INFO in its saved_regs field.
- This includes special registers such as pc and fp saved in special
- ways in the stack frame. sp is even more special:
- the address we return for it IS the sp for the next frame. */
+ cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache);
-void
-m68k_frame_init_saved_regs (struct frame_info *frame_info)
-{
- register int regnum;
- register int regmask;
- register CORE_ADDR next_addr;
- register CORE_ADDR pc;
+ /* Base address. */
+ cache->base = 0;
+ cache->sp_offset = -4;
+ cache->pc = 0;
- /* First possible address for a pc in a call dummy for this frame. */
- CORE_ADDR possible_call_dummy_start =
- get_frame_base (frame_info) - 28 - DEPRECATED_FP_REGNUM * 4 - 4 - 8 * 12;
+ /* 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;
- int nextinsn;
+ /* Frameless until proven otherwise. */
+ cache->locals = -1;
- if (get_frame_saved_regs (frame_info))
- return;
+ return cache;
+}
- frame_saved_regs_zalloc (frame_info);
+/* 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. */
- memset (get_frame_saved_regs (frame_info), 0, SIZEOF_FRAME_SAVED_REGS);
+static CORE_ADDR
+m68k_analyze_frame_setup (struct gdbarch *gdbarch,
+ CORE_ADDR pc, CORE_ADDR current_pc,
+ struct m68k_frame_cache *cache)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int op;
- if (get_frame_pc (frame_info) >= possible_call_dummy_start
- && get_frame_pc (frame_info) <= get_frame_base (frame_info))
- {
+ if (pc >= current_pc)
+ return current_pc;
- /* It is a call dummy. We could just stop now, since we know
- what the call dummy saves and where. But this code proceeds
- to parse the "prologue" which is part of the call dummy.
- This is needlessly complex and confusing. FIXME. */
+ op = read_memory_unsigned_integer (pc, 2, byte_order);
- next_addr = get_frame_base (frame_info);
- pc = possible_call_dummy_start;
- }
- else
+ if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP)
{
- pc = get_frame_func (frame_info);
-
- nextinsn = read_memory_unsigned_integer (pc, 2);
- if (P_PEA_FP == nextinsn
- && P_MOVL_SP_FP == read_memory_unsigned_integer (pc + 2, 2))
- {
- /* pea %fp
- move.l %sp, %fp */
- next_addr = get_frame_base (frame_info);
- pc += 4;
- }
- else if (P_LINKL_FP == nextinsn)
- /* link.l %fp */
- /* Find the address above the saved
- regs using the amount of storage from the link instruction. */
+ cache->saved_regs[M68K_FP_REGNUM] = 0;
+ cache->sp_offset += 4;
+ if (op == P_LINKW_FP)
{
- next_addr = get_frame_base (frame_info) + read_memory_integer (pc + 2, 4);
- pc += 6;
+ /* 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 (P_LINKW_FP == nextinsn)
- /* link.w %fp */
- /* Find the address above the saved
- regs using the amount of storage from the link instruction. */
+ else if (op == P_LINKL_FP)
{
- next_addr = get_frame_base (frame_info) + read_memory_integer (pc + 2, 2);
- pc += 4;
+ /* link.l %fp, #-N */
+ cache->locals = -read_memory_integer (pc + 2, 4, byte_order);
+ return pc + 6;
}
else
- goto lose;
+ {
+ /* pea (%fp); movea.l %sp, %fp */
+ cache->locals = 0;
- /* If have an addal #-n, sp next, adjust next_addr. */
- if (read_memory_unsigned_integer (pc, 2) == 0157774)
- next_addr += read_memory_integer (pc += 2, 4), pc += 4;
- }
+ if (pc + 2 < current_pc)
+ {
+ op = read_memory_unsigned_integer (pc + 2, 2, byte_order);
- for (;;)
- {
- nextinsn = read_memory_unsigned_integer (pc, 2);
- regmask = read_memory_unsigned_integer (pc + 2, 2);
- /* fmovemx to -(sp) */
- if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000)
- {
- /* Regmask's low bit is for register fp7, the first pushed */
- for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
- if (regmask & 1)
- get_frame_saved_regs (frame_info)[regnum] = (next_addr -= 12);
- pc += 4;
- }
- /* fmovemx to (fp + displacement) */
- else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000)
- {
- register CORE_ADDR addr;
-
- addr = get_frame_base (frame_info) + read_memory_integer (pc + 4, 2);
- /* Regmask's low bit is for register fp7, the first pushed */
- for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
- if (regmask & 1)
- {
- get_frame_saved_regs (frame_info)[regnum] = addr;
- addr += 12;
- }
- pc += 6;
- }
- /* moveml to (sp) */
- else if (0044327 == nextinsn)
- {
- /* Regmask's low bit is for register 0, the first written */
- for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
- if (regmask & 1)
- {
- get_frame_saved_regs (frame_info)[regnum] = next_addr;
- next_addr += 4;
- }
- pc += 4;
- }
- /* moveml to (fp + displacement) */
- else if (0044356 == nextinsn)
- {
- register CORE_ADDR addr;
-
- addr = get_frame_base (frame_info) + read_memory_integer (pc + 4, 2);
- /* Regmask's low bit is for register 0, the first written */
- for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
- if (regmask & 1)
- {
- get_frame_saved_regs (frame_info)[regnum] = addr;
- addr += 4;
- }
- pc += 6;
- }
- /* moveml to -(sp) */
- else if (0044347 == nextinsn)
- {
- /* Regmask's low bit is for register 15, the first pushed */
- for (regnum = 16; --regnum >= 0; regmask >>= 1)
- if (regmask & 1)
- get_frame_saved_regs (frame_info)[regnum] = (next_addr -= 4);
- pc += 4;
- }
- /* movl r,-(sp) */
- else if (0x2f00 == (0xfff0 & nextinsn))
- {
- regnum = 0xf & nextinsn;
- get_frame_saved_regs (frame_info)[regnum] = (next_addr -= 4);
- pc += 2;
- }
- /* fmovemx to index of sp */
- else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000)
- {
- /* Regmask's low bit is for register fp0, the first written */
- for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
- if (regmask & 1)
- {
- get_frame_saved_regs (frame_info)[regnum] = next_addr;
- next_addr += 12;
- }
- pc += 10;
+ if (op == P_MOVEAL_SP_FP)
+ {
+ /* move.l %sp, %fp */
+ return pc + 4;
+ }
+ }
+
+ return pc + 2;
}
- /* clrw -(sp); movw ccr,-(sp) */
- else if (0x4267 == nextinsn && 0x42e7 == regmask)
+ }
+ 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)
{
- get_frame_saved_regs (frame_info)[PS_REGNUM] = (next_addr -= 4);
- pc += 4;
+ 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;
+ }
}
- else
- break;
+ return pc + 2;
}
-lose:;
- get_frame_saved_regs (frame_info)[SP_REGNUM] = get_frame_base (frame_info) + 8;
- get_frame_saved_regs (frame_info)[DEPRECATED_FP_REGNUM] = get_frame_base (frame_info);
- get_frame_saved_regs (frame_info)[PC_REGNUM] = get_frame_base (frame_info) + 4;
-#ifdef SIG_SP_FP_OFFSET
- /* Adjust saved SP_REGNUM for fake _sigtramp frames. */
- if ((get_frame_type (frame_info) == SIGTRAMP_FRAME) && frame_info->next)
- frame_info->saved_regs[SP_REGNUM] =
- frame_info->next->frame + SIG_SP_FP_OFFSET;
-#endif
+ 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;
}
+/* 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. */
-#ifdef USE_PROC_FS /* Target dependent support for /proc */
+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);
-#include
+ if (cache->locals >= 0)
+ {
+ CORE_ADDR offset;
+ int op;
+ int i, mask, regno;
-/* Prototypes for supply_gregset etc. */
-#include "gregset.h"
+ 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;
+ }
+ }
-/* 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.
+ return pc;
+}
- 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:
- typedef int gregset_t[18];
+/* 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.
- #define R_D0 0
- ...
- #define R_PS 17
+ We handle all cases that can be generated by gcc.
- and the floating point set by:
+ For allocating a stack frame:
- typedef struct fpregset {
- int f_pcr;
- int f_psr;
- int f_fpiaddr;
- int f_fpregs[8][3]; (8 regs, 96 bits each)
- } fpregset_t;
+ 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
- These routines provide the packing and unpacking of gregset_t and
- fpregset_t formatted data.
+ For saving registers:
- */
+ fmovem.x REGS,-(%sp)
+ move.l R1,-(%sp)
+ move.l R1,-(%sp); move.l R2,-(%sp)
+ movem.l REGS,-(%sp)
-/* Atari SVR4 has R_SR but not R_PS */
+ For setting up the PIC register:
-#if !defined (R_PS) && defined (R_SR)
-#define R_PS R_SR
-#endif
+ lea (%pc,N),%a5
-/* 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. */
+ */
-void
-supply_gregset (gregset_t *gregsetp)
+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 (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;
+ struct m68k_frame_cache cache;
+ CORE_ADDR pc;
+ int op;
- for (regi = 0; regi < R_PC; regi++)
- {
- if ((regno == -1) || (regno == regi))
- {
- *(regp + regi) = *(int *) &deprecated_registers[REGISTER_BYTE (regi)];
- }
- }
- if ((regno == -1) || (regno == PS_REGNUM))
- {
- *(regp + R_PS) = *(int *) &deprecated_registers[REGISTER_BYTE (PS_REGNUM)];
- }
- if ((regno == -1) || (regno == PC_REGNUM))
- {
- *(regp + R_PC) = *(int *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)];
- }
+ cache.locals = -1;
+ pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache);
+ if (cache.locals < 0)
+ return start_pc;
+ return pc;
}
-#if defined (FP0_REGNUM)
+static CORE_ADDR
+m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ gdb_byte buf[8];
-/* 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. */
+ frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf);
+ return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr);
+}
+
+/* Normal frames. */
-void
-supply_fpregset (fpregset_t *fpregsetp)
+static struct m68k_frame_cache *
+m68k_frame_cache (struct frame_info *this_frame, void **this_cache)
{
- register int regi;
- char *from;
-
- for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++)
+ 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 *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)
{
- from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
- supply_register (regi, from);
+ /* 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;
}
- supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
- supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr));
- supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
+
+ /* 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;
}
-/* 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. */
+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);
-void
-fill_fpregset (fpregset_t *fpregsetp, int regno)
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ /* 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)
{
- int regi;
- char *to;
- char *from;
+ struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache);
- for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++)
- {
- if ((regno == -1) || (regno == regi))
- {
- from = (char *) &deprecated_registers[REGISTER_BYTE (regi)];
- to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
- memcpy (to, from, REGISTER_RAW_SIZE (regi));
- }
- }
- if ((regno == -1) || (regno == M68K_FPC_REGNUM))
- {
- fpregsetp->f_pcr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPC_REGNUM)];
- }
- if ((regno == -1) || (regno == M68K_FPS_REGNUM))
- {
- fpregsetp->f_psr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPS_REGNUM)];
- }
- if ((regno == -1) || (regno == M68K_FPI_REGNUM))
- {
- fpregsetp->f_fpiaddr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPI_REGNUM)];
- }
+ 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,
+ m68k_frame_this_id,
+ m68k_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+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;
}
-#endif /* defined (FP0_REGNUM) */
+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;
-#endif /* USE_PROC_FS */
+ 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));
+}
+
/* 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. */
-/* NOTE: cagney/2000-11-08: For this function to be fully multi-arched
- the macro's JB_PC and JB_ELEMENT_SIZE would need to be moved into
- the ``struct gdbarch_tdep'' object and then set on a target ISA/ABI
- dependant basis. */
-
-int
-m68k_get_longjmp_target (CORE_ADDR *pc)
+static int
+m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
-#if defined (JB_PC) && defined (JB_ELEMENT_SIZE)
- char *buf;
+ 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)
+ {
+ internal_error (__FILE__, __LINE__,
+ _("m68k_get_longjmp_target: not implemented"));
+ return 0;
+ }
- buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
- sp = read_register (SP_REGNUM);
+ buf = 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, TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT))
return 0;
- jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch)
+ / TARGET_CHAR_BIT, byte_order);
- if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
- TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ 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_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
+ *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch)
+ / TARGET_CHAR_BIT, byte_order);
return 1;
-#else
- internal_error (__FILE__, __LINE__,
- "m68k_get_longjmp_target: not implemented");
- return 0;
-#endif
}
+
-/* Immediately after a function call, return the saved pc before the frame
- is setup. For sun3's, 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. */
+/* System V Release 4 (SVR4). */
-CORE_ADDR
-m68k_saved_pc_after_call (struct frame_info *frame)
+void
+m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
-#ifdef SYSCALL_TRAP
- int op;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- op = read_memory_unsigned_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
+ /* SVR4 uses a different calling convention. */
+ set_gdbarch_return_value (gdbarch, m68k_svr4_return_value);
- if (op == SYSCALL_TRAP)
- return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4);
- else
-#endif /* SYSCALL_TRAP */
- return read_memory_unsigned_integer (read_register (SP_REGNUM), 4);
+ /* SVR4 uses %a0 instead of %a1. */
+ tdep->struct_value_regnum = M68K_A0_REGNUM;
}
+
/* Function: m68k_gdbarch_init
Initializer function for the m68k gdbarch vector.
@@ -966,105 +1063,223 @@ m68k_saved_pc_after_call (struct frame_info *frame)
static struct gdbarch *
m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- static LONGEST call_dummy_words[7] = { 0xf227e0ff, 0x48e7fffc, 0x426742e7,
- 0x4eb93232, 0x3232dffc, 0x69696969,
- (0x4e404e71 | (BPT_VECTOR << 16))
- };
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))
+ {
+ const struct tdesc_feature *feature;
+ int valid_p;
- /* find a candidate among the list of pre-declared architectures. */
- arches = gdbarch_list_lookup_by_info (arches, &info);
- if (arches != NULL)
- return (arches->gdbarch);
+ feature = tdesc_find_feature (info.target_desc,
+ "org.gnu.gdb.m68k.core");
+ if (feature != NULL)
+ /* Do nothing. */
+ ;
-#if 0
- tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
-#endif
-
- gdbarch = gdbarch_alloc (&info, 0);
+ if (feature == NULL)
+ {
+ 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;
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
+ tdesc_data = tdesc_data_alloc ();
- set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext);
- set_gdbarch_long_double_bit (gdbarch, 96);
+ valid_p = 1;
+ for (i = 0; i <= M68K_PC_REGNUM; i++)
+ valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ m68k_register_names[i]);
- set_gdbarch_function_start_offset (gdbarch, 0);
+ 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;
+ }
+
+ /* 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)
+ {
+ 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 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))
+ {
+ if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour)
+ continue;
+
+ if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present)
+ continue;
+
+ break;
+ }
+
+ if (best_arch != NULL)
+ {
+ if (tdesc_data != NULL)
+ tdesc_data_cleanup (tdesc_data);
+ return best_arch->gdbarch;
+ }
+
+ tdep = xzalloc (sizeof (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_deprecated_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call);
set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc);
/* Stack grows down. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_stack_align (gdbarch, m68k_stack_align);
- set_gdbarch_deprecated_extra_stack_alignment_needed (gdbarch, 1);
+ set_gdbarch_frame_align (gdbarch, m68k_frame_align);
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
- set_gdbarch_decr_pc_after_break (gdbarch, 2);
-
- set_gdbarch_deprecated_store_struct_return (gdbarch, m68k_store_struct_return);
- set_gdbarch_deprecated_extract_return_value (gdbarch,
- m68k_deprecated_extract_return_value);
- set_gdbarch_deprecated_store_return_value (gdbarch, m68k_store_return_value);
-
- set_gdbarch_deprecated_frame_chain (gdbarch, m68k_frame_chain);
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, m68k_frame_saved_pc);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs);
- set_gdbarch_frameless_function_invocation (gdbarch,
- m68k_frameless_function_invocation);
- /* OK to default this value to 'unknown'. */
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
+ 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_raw_size (gdbarch, m68k_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, m68k_register_virtual_size);
- set_gdbarch_deprecated_max_register_raw_size (gdbarch, 12);
- set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 12);
- set_gdbarch_register_virtual_type (gdbarch, m68k_register_virtual_type);
+ set_gdbarch_register_type (gdbarch, m68k_register_type);
set_gdbarch_register_name (gdbarch, m68k_register_name);
- set_gdbarch_deprecated_register_size (gdbarch, 4);
- set_gdbarch_register_byte (gdbarch, m68k_register_byte);
- set_gdbarch_num_regs (gdbarch, 29);
- set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok);
- set_gdbarch_register_bytes (gdbarch, (16 * 4 + 8 + 8 * 12 + 3 * 4));
+ set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM);
- set_gdbarch_deprecated_fp_regnum (gdbarch, M68K_FP_REGNUM);
set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM);
set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM);
- set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_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);
- set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0);
- set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
- set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 24);
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack);
- set_gdbarch_deprecated_call_dummy_length (gdbarch, 28);
- set_gdbarch_deprecated_call_dummy_start_offset (gdbarch, 12);
+ if (has_fp)
+ set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM);
- set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_words);
- set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_words));
- set_gdbarch_deprecated_fix_call_dummy (gdbarch, m68k_fix_call_dummy);
- set_gdbarch_deprecated_push_dummy_frame (gdbarch, m68k_push_dummy_frame);
- set_gdbarch_deprecated_pop_frame (gdbarch, m68k_pop_frame);
+ /* 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;
+ }
- /* Should be using push_dummy_call. */
- set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp);
+ /* Function call & return */
+ set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call);
+ set_gdbarch_return_value (gdbarch, m68k_return_value);
+
+
+ /* Disassembler. */
+ set_gdbarch_print_insn (gdbarch, print_insn_m68k);
+
+#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;
+
+ /* Frame unwinder. */
+ set_gdbarch_dummy_id (gdbarch, m68k_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc);
+
+ /* Hook in the DWARF CFI frame unwinder. */
+ dwarf2_append_unwinders (gdbarch);
+
+ frame_base_set_default (gdbarch, &m68k_frame_base);
+
+ /* 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. */
+
+ if (tdep->jb_pc >= 0)
+ set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target);
+
+ frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind);
+
+ if (tdesc_data)
+ tdesc_use_registers (gdbarch, info.target_desc, tdesc_data);
return gdbarch;
}
static void
-m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ if (tdep == NULL)
+ return;
}
+extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */
+
void
_initialize_m68k_tdep (void)
{
gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep);
- deprecated_tm_print_insn = print_insn_m68k;
}