/* Target-machine dependent code for Hitachi H8/300, for GDB.
Copyright (C) 1988, 1990, 1991 Free Software Foundation, Inc.
-This file is part of GDB.
+ 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
-(at your option) any later version.
+ 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 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 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, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 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. */
/*
- Contributed by Steve Chamberlain
- sac@cygnus.com
+ Contributed by Steve Chamberlain
+ sac@cygnus.com
*/
#include "defs.h"
#include "gdb_string.h"
#include "value.h"
+extern int h8300hmode, h8300smode;
#undef NUM_REGS
#define NUM_REGS 11
#define UNSIGNED_SHORT(X) ((X) & 0xffff)
-/* an easy to debug H8 stack frame looks like:
-0x6df6 push r6
-0x0d76 mov.w r7,r6
-0x6dfn push reg
-0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
-0x1957 sub.w r5,sp
-
- */
-
#define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
#define IS_PUSH_FP(x) (x == 0x6df6)
#define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
#define IS_MOVK_R5(x) (x==0x7905)
#define IS_SUB_R5SP(x) (x==0x1957)
+
+/* The register names change depending on whether the h8300h processor
+ type is selected. */
+
+static char *original_register_names[] = REGISTER_NAMES;
+
+static char *h8300h_register_names[] =
+{"er0", "er1", "er2", "er3", "er4", "er5", "er6",
+ "sp", "ccr", "pc", "cycles", "tick", "inst"};
+
+char **h8300_register_names = original_register_names;
+
+
/* Local function declarations. */
static CORE_ADDR examine_prologue ();
-static void set_machine_hook PARAMS ((char *filename));
+static void set_machine_hook (char *filename);
-void frame_find_saved_regs ();
-CORE_ADDR
+void h8300_frame_find_saved_regs ();
+
+CORE_ADDR
h8300_skip_prologue (start_pc)
CORE_ADDR start_pc;
{
short int w;
int adjust = 0;
- w = read_memory_unsigned_integer (start_pc, 2);
- if (w == 0x0100)
+ /* Skip past all push and stm insns. */
+ while (1)
{
- w = read_memory_unsigned_integer (start_pc + 2, 2);
- adjust = 2;
+ w = read_memory_unsigned_integer (start_pc, 2);
+ /* First look for push insns. */
+ if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130)
+ {
+ w = read_memory_unsigned_integer (start_pc + 2, 2);
+ adjust = 2;
+ }
+
+ if (IS_PUSH (w))
+ {
+ start_pc += 2 + adjust;
+ w = read_memory_unsigned_integer (start_pc, 2);
+ continue;
+ }
+ adjust = 0;
+ break;
}
- /* Skip past all push insns */
- while (IS_PUSH_FP (w))
+ /* Skip past a move to FP, either word or long sized */
+ w = read_memory_unsigned_integer (start_pc, 2);
+ if (w == 0x0100)
{
- start_pc += 2 + adjust;
- w = read_memory_unsigned_integer (start_pc, 2);
+ w = read_memory_unsigned_integer (start_pc + 2, 2);
+ adjust += 2;
}
- /* Skip past a move to FP */
if (IS_MOVE_FP (w))
{
- start_pc += 2;
+ start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
- /* Skip the stack adjust */
-
+ /* Check for loading either a word constant into r5;
+ long versions are handled by the SUBL_SP below. */
if (IS_MOVK_R5 (w))
{
start_pc += 2;
w = read_memory_unsigned_integer (start_pc, 2);
}
+
+ /* Now check for subtracting r5 from sp, word sized only. */
if (IS_SUB_R5SP (w))
{
- start_pc += 2;
+ start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
+
+ /* Check for subs #2 and subs #4. */
while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
{
- start_pc += 2;
+ start_pc += 2 + adjust;
w = read_memory_unsigned_integer (start_pc, 2);
}
+ /* Check for a 32bit subtract. */
if (IS_SUBL_SP (w))
- start_pc += 6;
+ start_pc += 6 + adjust;
return start_pc;
}
h8300_frame_chain (thisframe)
struct frame_info *thisframe;
{
- frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
+ if (PC_IN_CALL_DUMMY (thisframe->pc, thisframe->frame, thisframe->frame))
+ { /* initialize the from_pc now */
+ thisframe->from_pc = generic_read_register_dummy (thisframe->pc,
+ thisframe->frame,
+ PC_REGNUM);
+ return thisframe->frame;
+ }
+ h8300_frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
return thisframe->fsr->regs[SP_REGNUM];
}
ways in the stack frame. sp is even more special:
the address we return for it IS the sp for the next frame.
- We cache the result of doing this in the frame_cache_obstack, since
- it is fairly expensive. */
+ We cache the result of doing this in the frame_obstack, since it is
+ fairly expensive. */
void
-frame_find_saved_regs (fi, fsr)
+h8300_frame_find_saved_regs (fi, fsr)
struct frame_info *fi;
struct frame_saved_regs *fsr;
{
register struct frame_saved_regs *cache_fsr;
- extern struct obstack frame_cache_obstack;
CORE_ADDR ip;
struct symtab_and_line sal;
CORE_ADDR limit;
if (!fi->fsr)
{
cache_fsr = (struct frame_saved_regs *)
- obstack_alloc (&frame_cache_obstack,
- sizeof (struct frame_saved_regs));
+ frame_obstack_alloc (sizeof (struct frame_saved_regs));
memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
fi->fsr = cache_fsr;
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ { /* no more to do. */
+ if (fsr)
+ *fsr = *fi->fsr;
+ return;
+ }
/* Find the start and end of the function prologue. If the PC
- is in the function prologue, we only consider the part that
- has executed already. */
+ is in the function prologue, we only consider the part that
+ has executed already. */
ip = get_pc_function_start (fi->pc);
sal = find_pc_line (ip, 0);
/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
is not the address of a valid instruction, the address of the next
instruction beyond ADDR otherwise. *PWORD1 receives the first word
- of the instruction.*/
+ of the instruction. */
CORE_ADDR
NEXT_PROLOGUE_INSN (addr, lim, pword1)
{
after_prolog_fp = read_register (SP_REGNUM);
}
+
+ /* If the PC isn't valid, quit now. */
if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
return 0;
}
}
- /* Work out which regs are stored where */
- while (next_ip && IS_PUSH (insn_word))
+ /* Now examine the push insns to determine where everything lives
+ on the stack. */
+ while (1)
{
- ip = next_ip;
- next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
- fsr->regs[r] = after_prolog_fp + auto_depth;
- auto_depth += 2;
+ adjust = 0;
+ if (!next_ip)
+ break;
+
+ if (insn_word == 0x0100)
+ {
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ adjust = 2;
+ }
+
+ if (IS_PUSH (insn_word))
+ {
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ fsr->regs[r] = after_prolog_fp + auto_depth;
+ auto_depth += 2 + adjust;
+ continue;
+ }
+
+ /* Now check for push multiple insns. */
+ if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130)
+ {
+ int count = ((insn_word >> 4) & 0xf) + 1;
+ int start, i;
+
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ start = insn_word & 0x7;
+
+ for (i = start; i <= start + count; i++)
+ {
+ fsr->regs[i] = after_prolog_fp + auto_depth;
+ auto_depth += 4;
+ }
+ }
+ break;
}
/* The args are always reffed based from the stack pointer */
}
void
-init_extra_frame_info (fromleaf, fi)
+h8300_init_extra_frame_info (fromleaf, fi)
int fromleaf;
struct frame_info *fi;
{
fi->args_pointer = 0; /* Unknown */
fi->locals_pointer = 0; /* Unknown */
fi->from_pc = 0;
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ { /* anything special to do? */
+ return;
+ }
}
/* Return the saved PC from this frame.
just use the register SRP_REGNUM itself. */
CORE_ADDR
-frame_saved_pc (frame)
+h8300_frame_saved_pc (frame)
struct frame_info *frame;
{
- return frame->from_pc;
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ return generic_read_register_dummy (frame->pc, frame->frame, PC_REGNUM);
+ else
+ return frame->from_pc;
}
CORE_ADDR
frame_locals_address (fi)
struct frame_info *fi;
{
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return (CORE_ADDR) 0; /* Not sure what else to do... */
if (!fi->locals_pointer)
{
struct frame_saved_regs ignore;
frame_args_address (fi)
struct frame_info *fi;
{
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return (CORE_ADDR) 0; /* Not sure what else to do... */
if (!fi->args_pointer)
{
struct frame_saved_regs ignore;
return fi->args_pointer;
}
-void
+/* Function: push_arguments
+ Setup the function arguments for calling a function in the inferior.
+
+ On the Hitachi H8/300 architecture, there are three registers (R0 to R2)
+ which are dedicated for passing function arguments. Up to the first
+ three arguments (depending on size) may go into these registers.
+ The rest go on the stack.
+
+ Arguments that are smaller than WORDSIZE bytes will still take up a
+ whole register or a whole WORDSIZE word on the stack, and will be
+ right-justified in the register or the stack word. This includes
+ chars and small aggregate types. Note that WORDSIZE depends on the
+ cpu type.
+
+ Arguments that are larger than WORDSIZE bytes will be split between
+ two or more registers as available, but will NOT be split between a
+ register and the stack.
+
+ An exceptional case exists for struct arguments (and possibly other
+ aggregates such as arrays) -- if the size is larger than WORDSIZE
+ bytes but not a multiple of WORDSIZE bytes. In this case the
+ argument is never split between the registers and the stack, but
+ instead is copied in its entirety onto the stack, AND also copied
+ into as many registers as there is room for. In other words, space
+ in registers permitting, two copies of the same argument are passed
+ in. As far as I can tell, only the one on the stack is used,
+ although that may be a function of the level of compiler
+ optimization. I suspect this is a compiler bug. Arguments of
+ these odd sizes are left-justified within the word (as opposed to
+ arguments smaller than WORDSIZE bytes, which are right-justified).
+
+ If the function is to return an aggregate type such as a struct,
+ the caller must allocate space into which the callee will copy the
+ return value. In this case, a pointer to the return value location
+ is passed into the callee in register R0, which displaces one of
+ the other arguments passed in via registers R0 to R2. */
+
+CORE_ADDR
+h8300_push_arguments (nargs, args, sp, struct_return, struct_addr)
+ int nargs;
+ struct value **args;
+ CORE_ADDR sp;
+ unsigned char struct_return;
+ CORE_ADDR struct_addr;
+{
+ int stack_align, stack_alloc, stack_offset;
+ int wordsize;
+ int argreg;
+ int argnum;
+ struct type *type;
+ CORE_ADDR regval;
+ char *val;
+ char valbuf[4];
+ int len;
+
+ if (h8300hmode || h8300smode)
+ {
+ stack_align = 3;
+ wordsize = 4;
+ }
+ else
+ {
+ stack_align = 1;
+ wordsize = 2;
+ }
+
+ /* first force sp to a n-byte alignment */
+ sp = sp & ~stack_align;
+
+ /* Now make sure there's space on the stack */
+ for (argnum = 0, stack_alloc = 0;
+ argnum < nargs; argnum++)
+ stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + stack_align)
+ & ~stack_align);
+ sp -= stack_alloc; /* make room on stack for args */
+ /* we may over-allocate a little here, but that won't hurt anything */
+
+ argreg = ARG0_REGNUM;
+ if (struct_return) /* "struct return" pointer takes up one argreg */
+ {
+ write_register (argreg++, struct_addr);
+ }
+
+ /* Now load as many as possible of the first arguments into
+ registers, and push the rest onto the stack. There are 3N bytes
+ in three registers available. Loop thru args from first to last. */
+
+ for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
+ {
+ type = VALUE_TYPE (args[argnum]);
+ len = TYPE_LENGTH (type);
+ memset (valbuf, 0, sizeof (valbuf));
+ if (len < wordsize)
+ {
+ /* the purpose of this is to right-justify the value within the word */
+ memcpy (valbuf + (wordsize - len),
+ (char *) VALUE_CONTENTS (args[argnum]), len);
+ val = valbuf;
+ }
+ else
+ val = (char *) VALUE_CONTENTS (args[argnum]);
+
+ if (len > (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM) ||
+ (len > wordsize && (len & stack_align) != 0))
+ { /* passed on the stack */
+ write_memory (sp + stack_offset, val,
+ len < wordsize ? wordsize : len);
+ stack_offset += (len + stack_align) & ~stack_align;
+ }
+ /* NOTE WELL!!!!! This is not an "else if" clause!!!
+ That's because some *&^%$ things get passed on the stack
+ AND in the registers! */
+ if (len <= (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM))
+ while (len > 0)
+ { /* there's room in registers */
+ regval = extract_address (val, wordsize);
+ write_register (argreg, regval);
+ len -= wordsize;
+ val += wordsize;
+ argreg++;
+ }
+ }
+ return sp;
+}
+
+/* Function: push_return_address
+ Setup the return address for a dummy frame, as called by
+ call_function_by_hand. Only necessary when you are using an
+ empty CALL_DUMMY, ie. the target will not actually be executing
+ a JSR/BSR instruction. */
+
+CORE_ADDR
+h8300_push_return_address (pc, sp)
+ CORE_ADDR pc;
+ CORE_ADDR sp;
+{
+ unsigned char buf[4];
+ int wordsize;
+
+ if (h8300hmode || h8300smode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ sp -= wordsize;
+ store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ());
+ write_memory (sp, buf, wordsize);
+ return sp;
+}
+
+/* Function: pop_frame
+ Restore the machine to the state it had before the current frame
+ was created. Usually used either by the "RETURN" command, or by
+ call_function_by_hand after the dummy_frame is finished. */
+
+void
h8300_pop_frame ()
{
unsigned regnum;
struct frame_saved_regs fsr;
struct frame_info *frame = get_current_frame ();
- get_frame_saved_regs (frame, &fsr);
-
- for (regnum = 0; regnum < 8; regnum++)
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
{
- /* Don't forget SP_REGNUM is a frame_saved_regs struct is the
- actual value we want, not the address of the value we want. */
- if (fsr.regs[regnum] && regnum != SP_REGNUM)
- write_register (regnum, read_memory_integer(fsr.regs[regnum], BINWORD));
- else if (fsr.regs[regnum] && regnum == SP_REGNUM)
- write_register (regnum, fsr.regs[regnum]);
+ generic_pop_dummy_frame ();
}
+ else
+ {
+ get_frame_saved_regs (frame, &fsr);
+
+ for (regnum = 0; regnum < 8; regnum++)
+ {
+ /* Don't forget SP_REGNUM is a frame_saved_regs struct is the
+ actual value we want, not the address of the value we want. */
+ if (fsr.regs[regnum] && regnum != SP_REGNUM)
+ write_register (regnum,
+ read_memory_integer (fsr.regs[regnum], BINWORD));
+ else if (fsr.regs[regnum] && regnum == SP_REGNUM)
+ write_register (regnum, frame->frame + 2 * BINWORD);
+ }
- /* Don't forget the update the PC too! */
- write_pc (frame->from_pc);
+ /* Don't forget the update the PC too! */
+ write_pc (frame->from_pc);
+ }
flush_cached_frames ();
}
+/* Function: extract_return_value
+ Figure out where in REGBUF the called function has left its return value.
+ Copy that into VALBUF. Be sure to account for CPU type. */
+
+void
+h8300_extract_return_value (type, regbuf, valbuf)
+ struct type *type;
+ char *regbuf;
+ char *valbuf;
+{
+ int wordsize, len;
+
+ if (h8300smode || h8300hmode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ len = TYPE_LENGTH (type);
+
+ switch (len)
+ {
+ case 1: /* (char) */
+ case 2: /* (short), (int) */
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0) + (wordsize - len), len);
+ break;
+ case 4: /* (long), (float) */
+ if (h8300smode || h8300hmode)
+ {
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), 4);
+ }
+ else
+ {
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), 2);
+ memcpy (valbuf + 2, regbuf + REGISTER_BYTE (1), 2);
+ }
+ break;
+ case 8: /* (double) (doesn't seem to happen, which is good,
+ because this almost certainly isn't right. */
+ error ("I don't know how a double is returned.");
+ break;
+ }
+}
+
+/* Function: store_return_value
+ Place the appropriate value in the appropriate registers.
+ Primarily used by the RETURN command. */
+
+void
+h8300_store_return_value (type, valbuf)
+ struct type *type;
+ char *valbuf;
+{
+ int wordsize, len, regval;
+
+ if (h8300hmode || h8300smode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ len = TYPE_LENGTH (type);
+ switch (len)
+ {
+ case 1: /* char */
+ case 2: /* short, int */
+ regval = extract_address (valbuf, len);
+ write_register (0, regval);
+ break;
+ case 4: /* long, float */
+ regval = extract_address (valbuf, len);
+ if (h8300smode || h8300hmode)
+ {
+ write_register (0, regval);
+ }
+ else
+ {
+ write_register (0, regval >> 16);
+ write_register (1, regval & 0xffff);
+ }
+ break;
+ case 8: /* presumeably double, but doesn't seem to happen */
+ error ("I don't know how to return a double.");
+ break;
+ }
+}
struct cmd_list_element *setmemorylist;
static void
-h8300_command(args, from_tty)
+set_register_names ()
+{
+ if (h8300hmode != 0)
+ h8300_register_names = h8300h_register_names;
+ else
+ h8300_register_names = original_register_names;
+}
+
+static void
+h8300_command (args, from_tty)
{
extern int h8300hmode;
h8300hmode = 0;
h8300smode = 0;
+ set_register_names ();
}
static void
-h8300h_command(args, from_tty)
+h8300h_command (args, from_tty)
{
extern int h8300hmode;
h8300hmode = 1;
h8300smode = 0;
+ set_register_names ();
}
+
static void
-h8300s_command(args, from_tty)
+h8300s_command (args, from_tty)
{
extern int h8300smode;
extern int h8300hmode;
h8300smode = 1;
h8300hmode = 1;
+ set_register_names ();
}
-static void
+static void
set_machine (args, from_tty)
char *args;
int from_tty;
h8300smode = 1;
h8300hmode = 1;
}
- else
- if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
+ else if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
{
h8300smode = 0;
h8300hmode = 1;
h8300smode = 0;
h8300hmode = 0;
}
+ set_register_names ();
}
void
_initialize_h8300m ()
{
add_prefix_cmd ("machine", no_class, set_machine,
- "set the machine type", &setmemorylist, "set machine ", 0,
+ "set the machine type",
+ &setmemorylist, "set machine ", 0,
&setlist);
add_cmd ("h8300", class_support, h8300_command,
/* Add a hook to set the machine type when we're loading a file. */
- specify_exec_file_hook(set_machine_hook);
+ specify_exec_file_hook (set_machine_hook);
}
unsigned char b[4];
unsigned char l;
read_relative_register_raw_bytes (regno, b);
- l = b[REGISTER_VIRTUAL_SIZE(8) -1];
+ l = b[REGISTER_VIRTUAL_SIZE (8) - 1];
printf_unfiltered ("\t");
printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
projects / deliverable / binutils-gdb.git / blobdiff