-/* Target-dependent code for the NEC MN10300 for GDB, the GNU debugger.
- Copyright 1996, Free Software Foundation, Inc.
+/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
+ Copyright 1996, 1997, 1998, 2000, 2001
+ 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. */
-
-/* Contributed by Geoffrey Noer, noer@cygnus.com */
+ 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. */
#include "defs.h"
#include "frame.h"
#include "gdb_string.h"
#include "gdbcore.h"
#include "symfile.h"
+#include "regcache.h"
-/* Info gleaned from scanning a function's prologue. */
+extern void _initialize_mn10300_tdep (void);
+static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi,
+ CORE_ADDR pc);
-struct pifsr /* Info about one saved reg */
+/* mn10300 private data */
+struct gdbarch_tdep
{
- int framereg; /* Frame reg (SP or FP) */
- int offset; /* Offset from framereg */
- int reg; /* Saved register number */
+ int am33_mode;
+#define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode)
};
-struct prologue_info
+/* Additional info used by the frame */
+
+struct frame_extra_info
+ {
+ int status;
+ int stack_size;
+ };
+
+
+static char *
+register_name (int reg, char **regs, long sizeof_regs)
{
- int framereg;
- int frameoffset;
- int start_function;
- struct pifsr *pifsrs;
-};
+ if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
+ return NULL;
+ else
+ return regs[reg];
+}
-static CORE_ADDR
-mn10300_scan_prologue (pc, pi)
- CORE_ADDR pc;
- struct prologue_info *pi;
+static char *
+mn10300_generic_register_name (int reg)
{
+ static char *regs[] =
+ { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "fp"
+ };
+ return register_name (reg, regs, sizeof regs);
+}
+
+
+static char *
+am33_register_name (int reg)
+{
+ static char *regs[] =
+ { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "",
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
+ };
+ return register_name (reg, regs, sizeof regs);
+}
+
+CORE_ADDR
+mn10300_saved_pc_after_call (struct frame_info *fi)
+{
+ return read_memory_integer (read_register (SP_REGNUM), 4);
}
void
-mn10300_init_extra_frame_info (fi)
- struct frame_info *fi;
+mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
{
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type));
+ else
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type));
}
CORE_ADDR
-mn10300_frame_chain (fi)
- struct frame_info *fi;
+mn10300_extract_struct_value_address (char *regbuf)
+{
+ return extract_address (regbuf + REGISTER_BYTE (4),
+ REGISTER_RAW_SIZE (4));
+}
+
+void
+mn10300_store_return_value (struct type *type, char *valbuf)
+{
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ write_register_bytes (REGISTER_BYTE (4), valbuf, TYPE_LENGTH (type));
+ else
+ write_register_bytes (REGISTER_BYTE (0), valbuf, TYPE_LENGTH (type));
+}
+
+static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR);
+static struct frame_info *
+analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame)
{
+ static struct frame_info *dummy = NULL;
+ if (dummy == NULL)
+ {
+ dummy = xmalloc (sizeof (struct frame_info));
+ dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS);
+ dummy->extra_info = xmalloc (sizeof (struct frame_extra_info));
+ }
+ dummy->next = NULL;
+ dummy->prev = NULL;
+ dummy->pc = pc;
+ dummy->frame = frame;
+ dummy->extra_info->status = 0;
+ dummy->extra_info->stack_size = 0;
+ memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS);
+ mn10300_analyze_prologue (dummy, 0);
+ return dummy;
+}
+
+/* Values for frame_info.status */
+
+#define MY_FRAME_IN_SP 0x1
+#define MY_FRAME_IN_FP 0x2
+#define NO_MORE_FRAMES 0x4
+
+
+/* Should call_function allocate stack space for a struct return? */
+int
+mn10300_use_struct_convention (int gcc_p, struct type *type)
+{
+ return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+}
+
+/* The breakpoint instruction must be the same size as the smallest
+ instruction in the instruction set.
+
+ The Matsushita mn10x00 processors have single byte instructions
+ so we need a single byte breakpoint. Matsushita hasn't defined
+ one, so we defined it ourselves. */
+
+unsigned char *
+mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+{
+ static char breakpoint[] =
+ {0xff};
+ *bp_size = 1;
+ return breakpoint;
+}
+
+
+/* Fix fi->frame if it's bogus at this point. This is a helper
+ function for mn10300_analyze_prologue. */
+
+static void
+fix_frame_pointer (struct frame_info *fi, int stack_size)
+{
+ if (fi && fi->next == NULL)
+ {
+ if (fi->extra_info->status & MY_FRAME_IN_SP)
+ fi->frame = read_sp () - stack_size;
+ else if (fi->extra_info->status & MY_FRAME_IN_FP)
+ fi->frame = read_register (A3_REGNUM);
+ }
+}
+
+
+/* Set offsets of registers saved by movm instruction.
+ This is a helper function for mn10300_analyze_prologue. */
+
+static void
+set_movm_offsets (struct frame_info *fi, int movm_args)
+{
+ int offset = 0;
+
+ if (fi == NULL || movm_args == 0)
+ return;
+
+ if (movm_args & 0x10)
+ {
+ fi->saved_regs[A3_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (movm_args & 0x20)
+ {
+ fi->saved_regs[A2_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (movm_args & 0x40)
+ {
+ fi->saved_regs[D3_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (movm_args & 0x80)
+ {
+ fi->saved_regs[D2_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (AM33_MODE && movm_args & 0x02)
+ {
+ fi->saved_regs[E0_REGNUM + 5] = fi->frame + offset;
+ fi->saved_regs[E0_REGNUM + 4] = fi->frame + offset + 4;
+ fi->saved_regs[E0_REGNUM + 3] = fi->frame + offset + 8;
+ fi->saved_regs[E0_REGNUM + 2] = fi->frame + offset + 12;
+ }
+}
+
+
+/* The main purpose of this file is dealing with prologues to extract
+ information about stack frames and saved registers.
+
+ For reference here's how prologues look on the mn10300:
+
+ With frame pointer:
+ movm [d2,d3,a2,a3],sp
+ mov sp,a3
+ add <size>,sp
+
+ Without frame pointer:
+ movm [d2,d3,a2,a3],sp (if needed)
+ add <size>,sp
+
+ One day we might keep the stack pointer constant, that won't
+ change the code for prologues, but it will make the frame
+ pointerless case much more common. */
+
+/* Analyze the prologue to determine where registers are saved,
+ the end of the prologue, etc etc. Return the end of the prologue
+ scanned.
+
+ We store into FI (if non-null) several tidbits of information:
+
+ * stack_size -- size of this stack frame. Note that if we stop in
+ certain parts of the prologue/epilogue we may claim the size of the
+ current frame is zero. This happens when the current frame has
+ not been allocated yet or has already been deallocated.
+
+ * fsr -- Addresses of registers saved in the stack by this frame.
+
+ * status -- A (relatively) generic status indicator. It's a bitmask
+ with the following bits:
+
+ MY_FRAME_IN_SP: The base of the current frame is actually in
+ the stack pointer. This can happen for frame pointerless
+ functions, or cases where we're stopped in the prologue/epilogue
+ itself. For these cases mn10300_analyze_prologue will need up
+ update fi->frame before returning or analyzing the register
+ save instructions.
+
+ MY_FRAME_IN_FP: The base of the current frame is in the
+ frame pointer register ($a2).
+
+ NO_MORE_FRAMES: Set this if the current frame is "start" or
+ if the first instruction looks like mov <imm>,sp. This tells
+ frame chain to not bother trying to unwind past this frame. */
+
+static CORE_ADDR
+mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc)
+{
+ CORE_ADDR func_addr, func_end, addr, stop;
+ CORE_ADDR stack_size;
+ int imm_size;
+ unsigned char buf[4];
+ int status, movm_args = 0;
+ char *name;
+
+ /* Use the PC in the frame if it's provided to look up the
+ start of this function. */
+ pc = (fi ? fi->pc : pc);
+
+ /* Find the start of this function. */
+ status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
+
+ /* Do nothing if we couldn't find the start of this function or if we're
+ stopped at the first instruction in the prologue. */
+ if (status == 0)
+ {
+ return pc;
+ }
+
+ /* If we're in start, then give up. */
+ if (strcmp (name, "start") == 0)
+ {
+ if (fi != NULL)
+ fi->extra_info->status = NO_MORE_FRAMES;
+ return pc;
+ }
+
+ /* At the start of a function our frame is in the stack pointer. */
+ if (fi)
+ fi->extra_info->status = MY_FRAME_IN_SP;
+
+ /* Get the next two bytes into buf, we need two because rets is a two
+ byte insn and the first isn't enough to uniquely identify it. */
+ status = read_memory_nobpt (pc, buf, 2);
+ if (status != 0)
+ return pc;
+
+ /* If we're physically on an "rets" instruction, then our frame has
+ already been deallocated. Note this can also be true for retf
+ and ret if they specify a size of zero.
+
+ In this case fi->frame is bogus, we need to fix it. */
+ if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
+ {
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
+
+ /* Similarly if we're stopped on the first insn of a prologue as our
+ frame hasn't been allocated yet. */
+ if (fi && fi->pc == func_addr)
+ {
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
+
+ /* Figure out where to stop scanning. */
+ stop = fi ? fi->pc : func_end;
+
+ /* Don't walk off the end of the function. */
+ stop = stop > func_end ? func_end : stop;
+
+ /* Start scanning on the first instruction of this function. */
+ addr = func_addr;
+
+ /* Suck in two bytes. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ fix_frame_pointer (fi, 0);
+ return addr;
+ }
+
+ /* First see if this insn sets the stack pointer; if so, it's something
+ we won't understand, so quit now. */
+ if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
+ {
+ if (fi)
+ fi->extra_info->status = NO_MORE_FRAMES;
+ return addr;
+ }
+
+ /* Now look for movm [regs],sp, which saves the callee saved registers.
+
+ At this time we don't know if fi->frame is valid, so we only note
+ that we encountered a movm instruction. Later, we'll set the entries
+ in fsr.regs as needed. */
+ if (buf[0] == 0xcf)
+ {
+ /* Extract the register list for the movm instruction. */
+ status = read_memory_nobpt (addr + 1, buf, 1);
+ movm_args = *buf;
+
+ addr += 2;
+
+ /* Quit now if we're beyond the stop point. */
+ if (addr >= stop)
+ {
+ /* Fix fi->frame since it's bogus at this point. */
+ if (fi && fi->next == NULL)
+ fi->frame = read_sp ();
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* Get the next two bytes so the prologue scan can continue. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame since it's bogus at this point. */
+ if (fi && fi->next == NULL)
+ fi->frame = read_sp ();
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+ }
+
+ /* Now see if we set up a frame pointer via "mov sp,a3" */
+ if (buf[0] == 0x3f)
+ {
+ addr += 1;
+
+ /* The frame pointer is now valid. */
+ if (fi)
+ {
+ fi->extra_info->status |= MY_FRAME_IN_FP;
+ fi->extra_info->status &= ~MY_FRAME_IN_SP;
+ }
+
+ /* Quit now if we're beyond the stop point. */
+ if (addr >= stop)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* Get two more bytes so scanning can continue. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+ }
+
+ /* Next we should allocate the local frame. No more prologue insns
+ are found after allocating the local frame.
+
+ Search for add imm8,sp (0xf8feXX)
+ or add imm16,sp (0xfafeXXXX)
+ or add imm32,sp (0xfcfeXXXXXXXX).
+
+ If none of the above was found, then this prologue has no
+ additional stack. */
+
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ imm_size = 0;
+ if (buf[0] == 0xf8 && buf[1] == 0xfe)
+ imm_size = 1;
+ else if (buf[0] == 0xfa && buf[1] == 0xfe)
+ imm_size = 2;
+ else if (buf[0] == 0xfc && buf[1] == 0xfe)
+ imm_size = 4;
+
+ if (imm_size != 0)
+ {
+ /* Suck in imm_size more bytes, they'll hold the size of the
+ current frame. */
+ status = read_memory_nobpt (addr + 2, buf, imm_size);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* Note the size of the stack in the frame info structure. */
+ stack_size = extract_signed_integer (buf, imm_size);
+ if (fi)
+ fi->extra_info->stack_size = stack_size;
+
+ /* We just consumed 2 + imm_size bytes. */
+ addr += 2 + imm_size;
+
+ /* No more prologue insns follow, so begin preparation to return. */
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, stack_size);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* We never found an insn which allocates local stack space, regardless
+ this is the end of the prologue. */
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
}
+/* Function: frame_chain
+ Figure out and return the caller's frame pointer given current
+ frame_info struct.
+
+ We don't handle dummy frames yet but we would probably just return the
+ stack pointer that was in use at the time the function call was made? */
+
CORE_ADDR
-mn10300_find_callers_reg (fi, regnum)
- struct frame_info *fi;
- int regnum;
+mn10300_frame_chain (struct frame_info *fi)
{
+ struct frame_info *dummy;
+ /* Walk through the prologue to determine the stack size,
+ location of saved registers, end of the prologue, etc. */
+ if (fi->extra_info->status == 0)
+ mn10300_analyze_prologue (fi, (CORE_ADDR) 0);
+
+ /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
+ if (fi->extra_info->status & NO_MORE_FRAMES)
+ return 0;
+
+ /* Now that we've analyzed our prologue, determine the frame
+ pointer for our caller.
+
+ If our caller has a frame pointer, then we need to
+ find the entry value of $a3 to our function.
+
+ If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
+ location pointed to by fsr.regs[A3_REGNUM].
+
+ Else it's still in $a3.
+
+ If our caller does not have a frame pointer, then his
+ frame base is fi->frame + -caller's stack size. */
+
+ /* The easiest way to get that info is to analyze our caller's frame.
+ So we set up a dummy frame and call mn10300_analyze_prologue to
+ find stuff for us. */
+ dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame);
+
+ if (dummy->extra_info->status & MY_FRAME_IN_FP)
+ {
+ /* Our caller has a frame pointer. So find the frame in $a3 or
+ in the stack. */
+ if (fi->saved_regs[A3_REGNUM])
+ return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE));
+ else
+ return read_register (A3_REGNUM);
+ }
+ else
+ {
+ int adjust = 0;
+
+ adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0);
+ if (AM33_MODE)
+ {
+ adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0);
+ }
+
+ /* Our caller does not have a frame pointer. So his frame starts
+ at the base of our frame (fi->frame) + register save space
+ + <his size>. */
+ return fi->frame + adjust + -dummy->extra_info->stack_size;
+ }
}
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
+
CORE_ADDR
-mn10300_skip_prologue (pc)
- CORE_ADDR pc;
+mn10300_skip_prologue (CORE_ADDR pc)
{
+ /* We used to check the debug symbols, but that can lose if
+ we have a null prologue. */
+ return mn10300_analyze_prologue (NULL, pc);
}
+
/* Function: pop_frame
This routine gets called when either the user uses the `return'
command, or the call dummy breakpoint gets hit. */
void
-mn10300_pop_frame (frame)
- struct frame_info *frame;
+mn10300_pop_frame (struct frame_info *frame)
{
+ int regnum;
+
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ generic_pop_dummy_frame ();
+ else
+ {
+ write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+
+ /* Restore any saved registers. */
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ if (frame->saved_regs[regnum] != 0)
+ {
+ ULONGEST value;
+
+ value = read_memory_unsigned_integer (frame->saved_regs[regnum],
+ REGISTER_RAW_SIZE (regnum));
+ write_register (regnum, value);
+ }
+
+ /* Actually cut back the stack. */
+ write_register (SP_REGNUM, FRAME_FP (frame));
+
+ /* Don't we need to set the PC?!? XXX FIXME. */
+ }
+
+ /* Throw away any cached frame information. */
+ flush_cached_frames ();
}
+/* Function: push_arguments
+ Setup arguments for a call to the target. Arguments go in
+ order on the stack. */
+
CORE_ADDR
-mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr *args;
- CORE_ADDR sp;
- unsigned char struct_return;
- CORE_ADDR struct_addr;
+mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
+ int argnum = 0;
+ int len = 0;
+ int stack_offset = 0;
+ int regsused = struct_return ? 1 : 0;
+
+ /* This should be a nop, but align the stack just in case something
+ went wrong. Stacks are four byte aligned on the mn10300. */
+ sp &= ~3;
+
+ /* Now make space on the stack for the args.
+
+ XXX This doesn't appear to handle pass-by-invisible reference
+ arguments. */
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
+
+ while (regsused < 2 && arg_length > 0)
+ {
+ regsused++;
+ arg_length -= 4;
+ }
+ len += arg_length;
+ }
+
+ /* Allocate stack space. */
+ sp -= len;
+
+ regsused = struct_return ? 1 : 0;
+ /* Push all arguments onto the stack. */
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ int len;
+ char *val;
+
+ /* XXX Check this. What about UNIONS? */
+ if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
+ && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+ {
+ /* XXX Wrong, we want a pointer to this argument. */
+ len = TYPE_LENGTH (VALUE_TYPE (*args));
+ val = (char *) VALUE_CONTENTS (*args);
+ }
+ else
+ {
+ len = TYPE_LENGTH (VALUE_TYPE (*args));
+ val = (char *) VALUE_CONTENTS (*args);
+ }
+
+ while (regsused < 2 && len > 0)
+ {
+ write_register (regsused, extract_unsigned_integer (val, 4));
+ val += 4;
+ len -= 4;
+ regsused++;
+ }
+
+ while (len > 0)
+ {
+ write_memory (sp + stack_offset, val, 4);
+ len -= 4;
+ val += 4;
+ stack_offset += 4;
+ }
+
+ args++;
+ }
+
+ /* Make space for the flushback area. */
+ sp -= 8;
+ return sp;
}
+/* Function: push_return_address (pc)
+ Set up the return address for the inferior function call.
+ Needed for targets where we don't actually execute a JSR/BSR instruction */
+
CORE_ADDR
-mn10300_push_return_address (pc, sp)
- CORE_ADDR pc;
- CORE_ADDR sp;
+mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
{
+ unsigned char buf[4];
+
+ store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ());
+ write_memory (sp - 4, buf, 4);
+ return sp - 4;
}
-
+
+/* Function: store_struct_return (addr,sp)
+ Store the structure value return address for an inferior function
+ call. */
+
CORE_ADDR
-mn10300_frame_saved_pc (fi)
- struct frame_info *fi;
+mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
{
+ /* The structure return address is passed as the first argument. */
+ write_register (0, addr);
+ return sp;
}
+/* Function: frame_saved_pc
+ Find the caller of this frame. We do this by seeing if RP_REGNUM
+ is saved in the stack anywhere, otherwise we get it from the
+ registers. If the inner frame is a dummy frame, return its PC
+ instead of RP, because that's where "caller" of the dummy-frame
+ will be found. */
+
+CORE_ADDR
+mn10300_frame_saved_pc (struct frame_info *fi)
+{
+ int adjust = 0;
+
+ adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0);
+ if (AM33_MODE)
+ {
+ adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0);
+ adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0);
+ }
+
+ return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE));
+}
+
+/* Function: mn10300_init_extra_frame_info
+ Setup the frame's frame pointer, pc, and frame addresses for saved
+ registers. Most of the work is done in mn10300_analyze_prologue().
+
+ Note that when we are called for the last frame (currently active frame),
+ that fi->pc and fi->frame will already be setup. However, fi->frame will
+ be valid only if this routine uses FP. For previous frames, fi-frame will
+ always be correct. mn10300_analyze_prologue will fix fi->frame if
+ it's not valid.
+
+ We can be called with the PC in the call dummy under two circumstances.
+ First, during normal backtracing, second, while figuring out the frame
+ pointer just prior to calling the target function (see run_stack_dummy). */
+
void
-get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
- char *raw_buffer;
- int *optimized;
- CORE_ADDR *addrp;
- struct frame_info *frame;
- int regnum;
- enum lval_type *lval;
+mn10300_init_extra_frame_info (struct frame_info *fi)
{
- generic_get_saved_register (raw_buffer, optimized, addrp,
- frame, regnum, lval);
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
+
+ frame_saved_regs_zalloc (fi);
+ fi->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+
+ fi->extra_info->status = 0;
+ fi->extra_info->stack_size = 0;
+
+ mn10300_analyze_prologue (fi, 0);
}
-int
-mn10300_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
- char *dummy;
- CORE_ADDR sp;
- CORE_ADDR fun;
- int nargs;
- value_ptr *args;
- struct type *type;
- int gcc_p;
+/* Function: mn10300_virtual_frame_pointer
+ Return the register that the function uses for a frame pointer,
+ plus any necessary offset to be applied to the register before
+ any frame pointer offsets. */
+
+void
+mn10300_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset)
+{
+ struct frame_info *dummy = analyze_dummy_frame (pc, 0);
+ /* Set up a dummy frame_info, Analyze the prolog and fill in the
+ extra info. */
+ /* Results will tell us which type of frame it uses. */
+ if (dummy->extra_info->status & MY_FRAME_IN_SP)
+ {
+ *reg = SP_REGNUM;
+ *offset = -(dummy->extra_info->stack_size);
+ }
+ else
+ {
+ *reg = A3_REGNUM;
+ *offset = 0;
+ }
+}
+
+static int
+mn10300_reg_struct_has_addr (int gcc_p, struct type *type)
+{
+ return (TYPE_LENGTH (type) > 8);
+}
+
+static struct type *
+mn10300_register_virtual_type (int reg)
+{
+ return builtin_type_int;
+}
+
+static int
+mn10300_register_byte (int reg)
+{
+ return (reg * 4);
+}
+
+static int
+mn10300_register_virtual_size (int reg)
+{
+ return 4;
+}
+
+static int
+mn10300_register_raw_size (int reg)
+{
+ return 4;
+}
+
+static void
+mn10300_print_register (const char *name, int regnum, int reg_width)
+{
+ char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE);
+
+ if (reg_width)
+ printf_filtered ("%*s: ", reg_width, name);
+ else
+ printf_filtered ("%s: ", name);
+
+ /* Get the data */
+ if (read_relative_register_raw_bytes (regnum, raw_buffer))
+ {
+ printf_filtered ("[invalid]");
+ return;
+ }
+ else
+ {
+ int byte;
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum);
+ byte < REGISTER_RAW_SIZE (regnum);
+ byte++)
+ printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
+ }
+ else
+ {
+ for (byte = REGISTER_VIRTUAL_SIZE (regnum) - 1;
+ byte >= 0;
+ byte--)
+ printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
+ }
+ }
+}
+
+static void
+mn10300_do_registers_info (int regnum, int fpregs)
+{
+ if (regnum >= 0)
+ {
+ const char *name = REGISTER_NAME (regnum);
+ if (name == NULL || name[0] == '\0')
+ error ("Not a valid register for the current processor type");
+ mn10300_print_register (name, regnum, 0);
+ printf_filtered ("\n");
+ }
+ else
+ {
+ /* print registers in an array 4x8 */
+ int r;
+ int reg;
+ const int nr_in_row = 4;
+ const int reg_width = 4;
+ for (r = 0; r < NUM_REGS; r += nr_in_row)
+ {
+ int c;
+ int printing = 0;
+ int padding = 0;
+ for (c = r; c < r + nr_in_row; c++)
+ {
+ const char *name = REGISTER_NAME (c);
+ if (name != NULL && *name != '\0')
+ {
+ printing = 1;
+ while (padding > 0)
+ {
+ printf_filtered (" ");
+ padding--;
+ }
+ mn10300_print_register (name, c, reg_width);
+ printf_filtered (" ");
+ }
+ else
+ {
+ padding += (reg_width + 2 + 8 + 1);
+ }
+ }
+ if (printing)
+ printf_filtered ("\n");
+ }
+ }
+}
+
+/* Dump out the mn10300 speciic architecture information. */
+
+static void
+mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
+ tdep->am33_mode);
}
+static struct gdbarch *
+mn10300_gdbarch_init (struct gdbarch_info info,
+ struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep = NULL;
+ int am33_mode;
+ gdbarch_register_name_ftype *register_name;
+ int mach;
+ int num_regs;
+
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+ tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ if (info.bfd_arch_info != NULL
+ && info.bfd_arch_info->arch == bfd_arch_mn10300)
+ mach = info.bfd_arch_info->mach;
+ else
+ mach = 0;
+ switch (mach)
+ {
+ case 0:
+ case bfd_mach_mn10300:
+ am33_mode = 0;
+ register_name = mn10300_generic_register_name;
+ num_regs = 32;
+ break;
+ case bfd_mach_am33:
+ am33_mode = 1;
+ register_name = am33_register_name;
+ num_regs = 32;
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "mn10300_gdbarch_init: Unknown mn10300 variant");
+ return NULL; /* keep GCC happy. */
+ }
+
+ set_gdbarch_register_size (gdbarch, 4);
+ set_gdbarch_max_register_raw_size (gdbarch, 4);
+ set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type);
+ set_gdbarch_register_byte (gdbarch, mn10300_register_byte);
+ set_gdbarch_register_virtual_size (gdbarch, mn10300_register_virtual_size);
+ set_gdbarch_register_raw_size (gdbarch, mn10300_register_raw_size);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_register_name (gdbarch, register_name);
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 0);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register);
+ set_gdbarch_push_arguments (gdbarch, mn10300_push_arguments);
+ set_gdbarch_push_return_address (gdbarch, mn10300_push_return_address);
+ set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid);
+ set_gdbarch_reg_struct_has_addr (gdbarch, mn10300_reg_struct_has_addr);
+ set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
+ set_gdbarch_num_regs (gdbarch, num_regs);
+ set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info);
+
+ tdep->am33_mode = am33_mode;
+
+ return gdbarch;
+}
+
void
-_initialize_mn10300_tdep ()
+_initialize_mn10300_tdep (void)
{
+/* printf("_initialize_mn10300_tdep\n"); */
+
tm_print_insn = print_insn_mn10300;
+
+ register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init);
}
projects / deliverable / binutils-gdb.git / blobdiff