#define P_FMOVM 0xf237
#define P_TRAP 0x4e40
+
+/* Register numbers of various important registers.
+ Note that some of these values are "real" register numbers,
+ and correspond to the general registers of the machine,
+ and some are "phony" register numbers which are too large
+ to be actual register numbers as far as the user is concerned
+ but do serve to get the desired values when passed to read_register. */
+
+/* Note: Since they are used in files other than this (monitor files),
+ D0_REGNUM and A0_REGNUM are currently defined in tm-m68k.h. */
+
+enum
+{
+ E_A1_REGNUM = 9,
+ E_FP_REGNUM = 14, /* Contains address of executing stack frame */
+ E_SP_REGNUM = 15, /* Contains address of top of stack */
+ E_PS_REGNUM = 16, /* Contains processor status */
+ E_PC_REGNUM = 17, /* Contains program counter */
+ E_FP0_REGNUM = 18, /* Floating point register 0 */
+ E_FPC_REGNUM = 26, /* 68881 control register */
+ E_FPS_REGNUM = 27, /* 68881 status register */
+ E_FPI_REGNUM = 28
+};
+
+#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
+#define REGISTER_BYTES_NOFP (16*4 + 8)
+
+#define NUM_FREGS (NUM_REGS-24)
+
+/* 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 unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_BPT_VECTOR)};
+ *lenptr = sizeof (break_insn);
+ return break_insn;
+}
+
+const static unsigned char *
+m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
+ *lenptr = sizeof (break_insn);
+ return break_insn;
+}
+
+
+static int
+m68k_register_bytes_ok (long numbytes)
+{
+ return ((numbytes == REGISTER_BYTES_FP)
+ || (numbytes == REGISTER_BYTES_NOFP));
+}
+
/* 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. */
static struct type *
m68k_register_virtual_type (int regnum)
{
- if ((unsigned) regnum >= FPC_REGNUM)
+ if ((unsigned) regnum >= E_FPC_REGNUM)
return lookup_pointer_type (builtin_type_void);
else if ((unsigned) regnum >= FP0_REGNUM)
return builtin_type_long_double;
static int
m68k_register_byte (int regnum)
{
- if (regnum >= FPC_REGNUM)
- return (((regnum - FPC_REGNUM) * 4) + 168);
+ if (regnum >= E_FPC_REGNUM)
+ return (((regnum - E_FPC_REGNUM) * 4) + 168);
else if (regnum >= FP0_REGNUM)
return (((regnum - FP0_REGNUM) * 12) + 72);
else
return (regnum * 4);
}
+/* Store the address of the place in which to copy the structure the
+ subroutine will return. This is called from call_function. */
+
+static void
+m68k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ write_register (E_A1_REGNUM, addr);
+}
+
+/* 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. */
+
+static void
+m68k_deprecated_extract_return_value (struct type *type, char *regbuf,
+ char *valbuf)
+{
+ int offset = 0;
+ int typeLength = TYPE_LENGTH (type);
+
+ if (typeLength < 4)
+ offset = 4 - typeLength;
+
+ memcpy (valbuf, regbuf + offset, typeLength);
+}
+
+static CORE_ADDR
+m68k_deprecated_extract_struct_value_address (char *regbuf)
+{
+ return (*(CORE_ADDR *) (regbuf));
+}
+
+/* Write into appropriate registers a function return value
+ of type TYPE, given in virtual format. Assumes floats are passed
+ in d0/d1. */
+
+static void
+m68k_store_return_value (struct type *type, char *valbuf)
+{
+ write_register_bytes (0, valbuf, TYPE_LENGTH (type));
+}
+
+/* Describe the pointer in each stack frame to the previous stack frame
+ (its caller). */
+
+/* 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 (thisframe->signal_handler_caller)
+ return thisframe->frame;
+ else if (!inside_entry_file ((thisframe)->pc))
+ return read_memory_integer ((thisframe)->frame, 4);
+ else
+ return 0;
+}
+
+/* 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)
+{
+ if (fi->signal_handler_caller)
+ return 0;
+ else
+ return frameless_look_for_prologue (fi);
+}
+
+static CORE_ADDR
+m68k_frame_saved_pc (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ {
+ if (frame->next)
+ return read_memory_integer (frame->next->frame + SIG_PC_FP_OFFSET, 4);
+ else
+ return read_memory_integer (read_register (SP_REGNUM)
+ + SIG_PC_FP_OFFSET - 8, 4);
+ }
+ else
+ return read_memory_integer (frame->frame + 4, 4);
+}
+
+
/* The only reason this is here is the tm-altos.h reference below. It
was moved back here from tm-m68k.h. FIXME? */
register int regi;
char *from;
- for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
+ for (regi = FP0_REGNUM; regi < E_FPC_REGNUM; regi++)
{
from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
supply_register (regi, from);
}
- supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
- supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr));
- supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
+ supply_register (E_FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
+ supply_register (E_FPS_REGNUM, (char *) &(fpregsetp->f_psr));
+ supply_register (E_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
}
/* Given a pointer to a floating point register set in /proc format
char *to;
char *from;
- for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
+ for (regi = FP0_REGNUM; regi < E_FPC_REGNUM; regi++)
{
if ((regno == -1) || (regno == regi))
{
memcpy (to, from, REGISTER_RAW_SIZE (regi));
}
}
- if ((regno == -1) || (regno == FPC_REGNUM))
+ if ((regno == -1) || (regno == E_FPC_REGNUM))
{
- fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)];
+ fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (E_FPC_REGNUM)];
}
- if ((regno == -1) || (regno == FPS_REGNUM))
+ if ((regno == -1) || (regno == E_FPS_REGNUM))
{
- fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)];
+ fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (E_FPS_REGNUM)];
}
- if ((regno == -1) || (regno == FPI_REGNUM))
+ if ((regno == -1) || (regno == E_FPI_REGNUM))
{
- fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)];
+ fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (E_FPI_REGNUM)];
}
}
#if 0
tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
#endif
-
+
gdbarch = gdbarch_alloc (&info, 0);
set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext);
set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue);
set_gdbarch_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_believe_pcc_promotion (gdbarch, 1);
+ set_gdbarch_decr_pc_after_break (gdbarch, 2);
+
+ set_gdbarch_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_frame_chain (gdbarch, m68k_frame_chain);
+ set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid);
+ set_gdbarch_frame_saved_pc (gdbarch, m68k_frame_saved_pc);
+ set_gdbarch_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);
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+ set_gdbarch_frame_args_address (gdbarch, default_frame_address);
+ set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
+
set_gdbarch_register_raw_size (gdbarch, m68k_register_raw_size);
set_gdbarch_register_virtual_size (gdbarch, m68k_register_virtual_size);
set_gdbarch_max_register_raw_size (gdbarch, 12);
set_gdbarch_register_name (gdbarch, m68k_register_name);
set_gdbarch_register_size (gdbarch, 4);
set_gdbarch_register_byte (gdbarch, m68k_register_byte);
-
- set_gdbarch_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs);
+ 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_sp_regnum (gdbarch, E_SP_REGNUM);
+ set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_ps_regnum (gdbarch, E_PS_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, E_FP0_REGNUM);
set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
projects / deliverable / binutils-gdb.git / blobdiff