You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/*
+/*
Contributed by Steve Chamberlain
*/
-#include <stdio.h>
#include "defs.h"
#include "frame.h"
#include "obstack.h"
#include "symtab.h"
-#define UNSIGNED_SHORT(X) ((X) & 0xffff)
+#include "dis-asm.h"
+#include "gdbcmd.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "value.h"
-/* an easy to debug H8 stack frame looks like:
-0x6df2 push r2
-0x6df3 push r3
-0x6df6 push r6
-0x mov.w r7,r6
- subs stuff,sp mov.w #x,r5
- subs r5,sp
- */
+#undef NUM_REGS
+#define NUM_REGS 11
+
+#define UNSIGNED_SHORT(X) ((X) & 0xffff)
-#define IS_PUSH(x) ((x & 0xff00)==0x6d00)
-#define IS_MOVE_FP(x) (x == 0x0d76)
-#define IS_MOV_SP_FP(x) (x == 0x0d76)
+#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_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6)
#define IS_SUB2_SP(x) (x==0x1b87)
+#define IS_SUB4_SP(x) (x==0x1b97)
+#define IS_SUBL_SP(x) (x==0x7a37)
#define IS_MOVK_R5(x) (x==0x7905)
-CORE_ADDR examine_prologue();
+#define IS_SUB_R5SP(x) (x==0x1957)
-void frame_find_saved_regs ();
-CORE_ADDR h8300_skip_prologue(start_pc)
-CORE_ADDR start_pc;
+/* Local function declarations. */
-{
+static CORE_ADDR examine_prologue ();
+static void set_machine_hook PARAMS ((char *filename));
- /* Skip past all push insns */
+void frame_find_saved_regs ();
+CORE_ADDR
+h8300_skip_prologue (start_pc)
+ CORE_ADDR start_pc;
+{
short int w;
-
- w = read_memory_integer(start_pc, 2);
- while (IS_PUSH(w))
- {
- start_pc+=2;
- w = read_memory_integer(start_pc, 2);
- }
-
- /* Skip past a move to FP */
- if (IS_MOVE_FP(w)) {
- start_pc +=2 ;
- w = read_memory_integer(start_pc, 2);
+ int adjust = 0;
+
+ /* Skip past all push and stm insns. */
+ while (1)
+ {
+ 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;
}
- return start_pc;
-
-}
+ /* Skip past a move to FP, either word or long sized */
+ w = read_memory_unsigned_integer (start_pc, 2);
+ if (w == 0x0100)
+ {
+ w = read_memory_unsigned_integer (start_pc + 2, 2);
+ adjust += 2;
+ }
+
+ if (IS_MOVE_FP (w))
+ {
+ start_pc += 2 + adjust;
+ w = read_memory_unsigned_integer (start_pc, 2);
+ }
+ /* 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 + 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 + adjust;
+ w = read_memory_unsigned_integer (start_pc, 2);
+ }
+
+ /* Check for a 32bit subtract. */
+ if (IS_SUBL_SP (w))
+ start_pc += 6 + adjust;
+
+ return start_pc;
+}
int
-print_insn(memaddr, stream)
-CORE_ADDR memaddr;
-FILE *stream;
+gdb_print_insn_h8300 (memaddr, info)
+ bfd_vma memaddr;
+ disassemble_info *info;
{
- /* Nothing is bigger than 8 bytes */
- char data[8];
- read_memory (memaddr, data, sizeof(data));
- return print_insn_h8300(memaddr, data, stream);
+ if (h8300smode)
+ return print_insn_h8300s (memaddr, info);
+ else if (h8300hmode)
+ return print_insn_h8300h (memaddr, info);
+ else
+ return print_insn_h8300 (memaddr, info);
}
-
-
+
/* Given a GDB frame, determine the address of the calling function's frame.
This will be used to create a new GDB frame struct, and then
INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
For us, the frame address is its stack pointer value, so we look up
the function prologue to determine the caller's sp value, and return it. */
-FRAME_ADDR
-FRAME_CHAIN (thisframe)
- FRAME thisframe;
+CORE_ADDR
+h8300_frame_chain (thisframe)
+ struct frame_info *thisframe;
{
-
frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
- return thisframe->fsr->regs[SP_REGNUM];
+ return thisframe->fsr->regs[SP_REGNUM];
}
-
-
/* Put here the code to store, into a struct frame_saved_regs,
the addresses of the saved registers of frame described by FRAME_INFO.
This includes special registers such as pc and fp saved in special
struct frame_info *fi;
struct frame_saved_regs *fsr;
{
- register CORE_ADDR next_addr;
- register CORE_ADDR *saved_regs;
- register int regnum;
register struct frame_saved_regs *cache_fsr;
extern struct obstack frame_cache_obstack;
CORE_ADDR ip;
if (!fi->fsr)
{
cache_fsr = (struct frame_saved_regs *)
- obstack_alloc (&frame_cache_obstack,
- sizeof (struct frame_saved_regs));
- bzero (cache_fsr, sizeof (struct frame_saved_regs));
+ obstack_alloc (&frame_cache_obstack,
+ sizeof (struct frame_saved_regs));
+ memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
+
fi->fsr = cache_fsr;
/* 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. */
-
+
ip = get_pc_function_start (fi->pc);
sal = find_pc_line (ip, 0);
- limit = (sal.end && sal.end < fi->pc) ? sal.end: fi->pc;
+ limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc;
/* This will fill in fields in *fi as well as in cache_fsr. */
examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
if (fsr)
*fsr = *fi->fsr;
}
-
/* 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.*/
-
CORE_ADDR
-NEXT_PROLOGUE_INSN(addr, lim, pword1)
-CORE_ADDR addr;
-CORE_ADDR lim;
-short *pword1;
+NEXT_PROLOGUE_INSN (addr, lim, pword1)
+ CORE_ADDR addr;
+ CORE_ADDR lim;
+ INSN_WORD *pword1;
{
- if (addr < lim+8)
- {
- read_memory (addr, pword1, sizeof(*pword1));
- SWAP_TARGET_AND_HOST (pword1, sizeof (short));
- return addr + 2;
- }
+ char buf[2];
+ if (addr < lim + 8)
+ {
+ read_memory (addr, buf, 2);
+ *pword1 = extract_signed_integer (buf, 2);
+ return addr + 2;
+ }
return 0;
-
}
/* Examine the prologue of a function. `ip' points to the first instruction.
- `limit' is the limit of the prologue (e.g. the addr of the first
+ `limit' is the limit of the prologue (e.g. the addr of the first
linenumber, or perhaps the program counter if we're stepping through).
- `frame_sp' is the stack pointer value in use in this frame.
+ `frame_sp' is the stack pointer value in use in this frame.
`fsr' is a pointer to a frame_saved_regs structure into which we put
- info about the registers saved by this frame.
+ info about the registers saved by this frame.
`fi' is a struct frame_info pointer; we fill in various fields in it
to reflect the offsets of the arg pointer and the locals pointer. */
-/* We will find two sorts of prologue, framefull and non framefull:
-
- push r2
- push r3
- push fp
- mov sp,fp
- stack_ad
-
- and
- push x
- push y
- stack_ad
-
-*/
-
static CORE_ADDR
examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
register CORE_ADDR ip;
register CORE_ADDR limit;
- FRAME_ADDR after_prolog_fp;
+ CORE_ADDR after_prolog_fp;
struct frame_saved_regs *fsr;
struct frame_info *fi;
{
register CORE_ADDR next_ip;
int r;
- int i;
int have_fp = 0;
-
- register int src;
- register struct pic_prologue_code *pcode;
INSN_WORD insn_word;
- int size, offset;
- unsigned int reg_save_depth = 2; /* Number of things pushed onto
- stack, starts at 2, 'cause the
- PC is already there */
+ /* Number of things pushed onto stack, starts at 2/4, 'cause the
+ PC is already there */
+ unsigned int reg_save_depth = h8300hmode ? 4 : 2;
unsigned int auto_depth = 0; /* Number of bytes of autos */
-
- char in_frame[NUM_REGS]; /* One for each reg */
-
- memset(in_frame, 1, NUM_REGS);
-
- if (after_prolog_fp == 0) {
- after_prolog_fp = read_register(SP_REGNUM);
- }
- if (ip == 0 || ip & ~0xffff) return 0;
- next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ char in_frame[11]; /* One for each reg */
- /* Skip over any push instructions, and remember where they were saved */
+ int adjust = 0;
+
+ memset (in_frame, 1, 11);
+ for (r = 0; r < 8; r++)
+ {
+ fsr->regs[r] = 0;
+ }
+ if (after_prolog_fp == 0)
+ {
+ after_prolog_fp = read_register (SP_REGNUM);
+ }
+ /* If the PC isn't valid, quit now. */
+ if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
+ return 0;
- while (next_ip && IS_PUSH(insn_word))
- {
- ip = next_ip;
- in_frame[insn_word & 0x7] = reg_save_depth;
- next_ip = NEXT_PROLOGUE_INSN(ip, limit, &insn_word);
- reg_save_depth +=2;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
- }
-
+ if (insn_word == 0x0100)
+ {
+ insn_word = read_memory_unsigned_integer (ip + 2, 2);
+ adjust = 2;
+ }
+
+ /* Skip over any fp push instructions */
+ fsr->regs[6] = after_prolog_fp;
+ while (next_ip && IS_PUSH_FP (insn_word))
+ {
+ ip = next_ip + adjust;
+
+ in_frame[insn_word & 0x7] = reg_save_depth;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ reg_save_depth += 2 + adjust;
+ }
/* Is this a move into the fp */
- if (next_ip && IS_MOV_SP_FP(insn_word))
- {
- ip = next_ip;
- next_ip = NEXT_PROLOGUE_INSN(ip, limit, &insn_word);
- have_fp = 1;
-
- }
-
+ if (next_ip && IS_MOV_SP_FP (insn_word))
+ {
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ have_fp = 1;
+ }
/* Skip over any stack adjustment, happens either with a number of
sub#2,sp or a mov #x,r5 sub r5,sp */
-
- if (next_ip && IS_SUB2_SP(insn_word))
- {
- while (next_ip && IS_SUB2_SP(insn_word))
+ if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
{
- auto_depth +=2 ;
- ip = next_ip;
- next_ip = NEXT_PROLOGUE_INSN(ip, limit, &insn_word);
+ while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
+ {
+ auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4;
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ }
}
- }
- else
- {
- if (next_ip && IS_MOVK_R5(insn_word))
+ else
{
- ip = next_ip;
- next_ip = NEXT_PROLOGUE_INSN(ip, limit, &insn_word);
- auto_depth += insn_word;
- ip +=4;
-
+ if (next_ip && IS_MOVK_R5 (insn_word))
+ {
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ auto_depth += insn_word;
+
+ next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word);
+ auto_depth += insn_word;
+ }
+ if (next_ip && IS_SUBL_SP (insn_word))
+ {
+ ip = next_ip;
+ auto_depth += read_memory_unsigned_integer (ip, 4);
+ ip += 4;
+
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+ }
}
- }
+ /* Now examine the push insns to determine where everything lives
+ on the stack. */
+ while (1)
+ {
+ 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 */
- fi->args_pointer = after_prolog_fp - auto_depth;
+ fi->args_pointer = after_prolog_fp;
/* Locals are always reffed based from the fp */
- fi->locals_pointer = after_prolog_fp ;
+ fi->locals_pointer = after_prolog_fp;
/* The PC is at a known place */
- fi->from_pc = read_memory_integer(after_prolog_fp + reg_save_depth-2 , 2);
-
+ fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD);
/* Rememeber any others too */
-
in_frame[PC_REGNUM] = 0;
-
- for (r = 0; r < NUM_REGS; r++)
- {
- if (in_frame[r] != 1)
- {
- fsr->regs[r] = after_prolog_fp + reg_save_depth - in_frame[r] -2;
- }
- else
- {
- fsr->regs[r] = 0;
- }
- }
- if (have_fp)
- /* We keep the old FP in the SP spot */
- fsr->regs[SP_REGNUM] = read_memory_integer(fsr->regs[6],2);
- else
- fsr->regs[SP_REGNUM] = after_prolog_fp + reg_save_depth;
-
+
+ if (have_fp)
+ /* We keep the old FP in the SP spot */
+ fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD);
+ else
+ fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth;
+
return (ip);
}
fi->args_pointer = 0; /* Unknown */
fi->locals_pointer = 0; /* Unknown */
fi->from_pc = 0;
-
}
+
/* Return the saved PC from this frame.
If the frame has a memory copy of SRP_REGNUM, use that. If not,
CORE_ADDR
frame_saved_pc (frame)
-FRAME frame;
-
+ struct frame_info *frame;
{
return frame->from_pc;
}
-
CORE_ADDR
frame_locals_address (fi)
struct frame_info *fi;
{
- if (!fi->locals_pointer)
- {
- struct frame_saved_regs ignore;
- get_frame_saved_regs(fi, &ignore);
+ if (!fi->locals_pointer)
+ {
+ struct frame_saved_regs ignore;
- }
+ get_frame_saved_regs (fi, &ignore);
+
+ }
return fi->locals_pointer;
}
frame_args_address (fi)
struct frame_info *fi;
{
- if (!fi->args_pointer)
- {
- struct frame_saved_regs ignore;
- get_frame_saved_regs(fi, &ignore);
+ if (!fi->args_pointer)
+ {
+ struct frame_saved_regs ignore;
+
+ get_frame_saved_regs (fi, &ignore);
+
+ }
- }
-
return fi->args_pointer;
}
-
-void h8300_pop_frame()
+void
+h8300_pop_frame ()
{
unsigned regnum;
struct frame_saved_regs fsr;
- struct frame_info *fi;
+ struct frame_info *frame = get_current_frame ();
- FRAME frame = get_current_frame();
- fi = get_frame_info(frame);
- get_frame_saved_regs(fi, &fsr);
+ get_frame_saved_regs (frame, &fsr);
- for (regnum = 0; regnum < NUM_REGS; regnum ++)
- {
- if(fsr.regs[regnum])
+ for (regnum = 0; regnum < 8; regnum++)
{
- write_register(regnum, read_memory_integer (fsr.regs[regnum], 2));
+ /* 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]);
}
-
- flush_cached_frames();
- set_current_frame(create_new_frame(read_register(FP_REGNUM),
- read_pc()));
-
- }
+ /* Don't forget the update the PC too! */
+ write_pc (frame->from_pc);
+ flush_cached_frames ();
+}
+
+
+struct cmd_list_element *setmemorylist;
+
+static void
+h8300_command(args, from_tty)
+{
+ extern int h8300hmode;
+ h8300hmode = 0;
+ h8300smode = 0;
+}
+
+static void
+h8300h_command(args, from_tty)
+{
+ extern int h8300hmode;
+ h8300hmode = 1;
+ h8300smode = 0;
+}
+static void
+h8300s_command(args, from_tty)
+{
+ extern int h8300smode;
+ extern int h8300hmode;
+ h8300smode = 1;
+ h8300hmode = 1;
+}
+
+
+static void
+set_machine (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h");
+ printf_unfiltered ("or h8300s");
+ help_list (setmemorylist, "set memory ", -1, gdb_stdout);
+}
+
+/* set_machine_hook is called as the exec file is being opened, but
+ before the symbol file is opened. This allows us to set the
+ h8300hmode flag based on the machine type specified in the exec
+ file. This in turn will cause subsequently defined pointer types
+ to be 16 or 32 bits as appropriate for the machine. */
+
+static void
+set_machine_hook (filename)
+ char *filename;
+{
+ if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s)
+ {
+ h8300smode = 1;
+ h8300hmode = 1;
+ }
+ else
+ if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
+ {
+ h8300smode = 0;
+ h8300hmode = 1;
+ }
+ else
+ {
+ h8300smode = 0;
+ h8300hmode = 0;
+ }
+}
+
+void
+_initialize_h8300m ()
+{
+ add_prefix_cmd ("machine", no_class, set_machine,
+ "set the machine type", &setmemorylist, "set machine ", 0,
+ &setlist);
+
+ add_cmd ("h8300", class_support, h8300_command,
+ "Set machine to be H8/300.", &setmemorylist);
+
+ add_cmd ("h8300h", class_support, h8300h_command,
+ "Set machine to be H8/300H.", &setmemorylist);
+
+ add_cmd ("h8300s", class_support, h8300s_command,
+ "Set machine to be H8/300S.", &setmemorylist);
+
+ /* Add a hook to set the machine type when we're loading a file. */
+
+ specify_exec_file_hook(set_machine_hook);
+}
+
+
+
+void
+print_register_hook (regno)
+{
+ if (regno == 8)
+ {
+ /* CCR register */
+ int C, Z, N, V;
+ unsigned char b[4];
+ unsigned char l;
+ read_relative_register_raw_bytes (regno, b);
+ l = b[REGISTER_VIRTUAL_SIZE(8) -1];
+ printf_unfiltered ("\t");
+ printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
+ printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
+ N = (l & 0x8) != 0;
+ Z = (l & 0x4) != 0;
+ V = (l & 0x2) != 0;
+ C = (l & 0x1) != 0;
+ printf_unfiltered ("N-%d ", N);
+ printf_unfiltered ("Z-%d ", Z);
+ printf_unfiltered ("V-%d ", V);
+ printf_unfiltered ("C-%d ", C);
+ if ((C | Z) == 0)
+ printf_unfiltered ("u> ");
+ if ((C | Z) == 1)
+ printf_unfiltered ("u<= ");
+ if ((C == 0))
+ printf_unfiltered ("u>= ");
+ if (C == 1)
+ printf_unfiltered ("u< ");
+ if (Z == 0)
+ printf_unfiltered ("!= ");
+ if (Z == 1)
+ printf_unfiltered ("== ");
+ if ((N ^ V) == 0)
+ printf_unfiltered (">= ");
+ if ((N ^ V) == 1)
+ printf_unfiltered ("< ");
+ if ((Z | (N ^ V)) == 0)
+ printf_unfiltered ("> ");
+ if ((Z | (N ^ V)) == 1)
+ printf_unfiltered ("<= ");
+ }
+}
+
+void
+_initialize_h8300_tdep ()
+{
+ tm_print_insn = gdb_print_insn_h8300;
}
projects / binutils.git / blobdiff