/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997, 1998 Free Software Foundation, Inc.
-This file is part of GDB.
+ Copyright (C) 1996-2020 Free Software Foundation, Inc.
-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 file is part of GDB.
-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 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 3 of the License, or
+ (at your option) any later version.
-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. */
+ 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "gdbcore.h" /* For write_memory_unsigned_integer. */
+#include "value.h"
#include "frame.h"
-#include "inferior.h"
-#include "obstack.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "symtab.h"
+#include "dwarf2/frame.h"
+#include "osabi.h"
+#include "infcall.h"
+#include "prologue-value.h"
#include "target.h"
-#include "value.h"
-#include "bfd.h"
-#include "gdb_string.h"
-#include "gdbcore.h"
-#include "symfile.h"
-char *mn10300_generic_register_names[] = REGISTER_NAMES;
+#include "mn10300-tdep.h"
-/* start-sanitize-am33 */
-char *am33_register_names [] =
-{ "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", "", "", ""};
-/* end-sanitize-am33 */
+/* The am33-2 has 64 registers. */
+#define MN10300_MAX_NUM_REGS 64
-/* Set offsets of registers saved by movm instruction.
- This is a helper function for mn10300_analyze_prologue. */
+/* Big enough to hold the size of the largest register in bytes. */
+#define MN10300_MAX_REGISTER_SIZE 64
-static void
-set_movm_offsets (fi, found_movm)
- struct frame_info *fi;
- int found_movm;
+/* This structure holds the results of a prologue analysis. */
+struct mn10300_prologue
{
- if (fi == NULL || found_movm == 0)
- return;
- fi->fsr.regs[7] = fi->frame;
- fi->fsr.regs[6] = fi->frame + 4;
- fi->fsr.regs[3] = fi->frame + 8;
- fi->fsr.regs[2] = fi->frame + 12;
- /* start-sanitize-am33 */
- fi->fsr.regs[E0_REGNUM+5] = fi->frame + 16;
- fi->fsr.regs[E0_REGNUM+4] = fi->frame + 20;
- fi->fsr.regs[E0_REGNUM+3] = fi->frame + 24;
- fi->fsr.regs[E0_REGNUM+2] = fi->frame + 28;
- /* end-sanitize-am33 */
-}
+ /* The architecture for which we generated this prologue info. */
+ struct gdbarch *gdbarch;
+ /* The offset from the frame base to the stack pointer --- always
+ zero or negative.
-/* The main purpose of this file is dealing with prologues to extract
- information about stack frames and saved registers.
+ Calling this a "size" is a bit misleading, but given that the
+ stack grows downwards, using offsets for everything keeps one
+ from going completely sign-crazy: you never change anything's
+ sign for an ADD instruction; always change the second operand's
+ sign for a SUB instruction; and everything takes care of
+ itself. */
+ int frame_size;
- For reference here's how prologues look on the mn10300:
+ /* Non-zero if this function has initialized the frame pointer from
+ the stack pointer, zero otherwise. */
+ int has_frame_ptr;
- With frame pointer:
- movm [d2,d3,a2,a3],sp
- mov sp,a3
- add <size>,sp
+ /* If has_frame_ptr is non-zero, this is the offset from the frame
+ base to where the frame pointer points. This is always zero or
+ negative. */
+ int frame_ptr_offset;
- Without frame pointer:
- movm [d2,d3,a2,a3],sp (if needed)
- add <size>,sp
+ /* The address of the first instruction at which the frame has been
+ set up and the arguments are where the debug info says they are
+ --- as best as we can tell. */
+ CORE_ADDR prologue_end;
- 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.
+ /* reg_offset[R] is the offset from the CFA at which register R is
+ saved, or 1 if register R has not been saved. (Real values are
+ always zero or negative.) */
+ int reg_offset[MN10300_MAX_NUM_REGS];
+};
- 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.
+/* Compute the alignment required by a type. */
- * fsr -- Addresses of registers saved in the stack by this frame.
+static int
+mn10300_type_align (struct type *type)
+{
+ int i, align = 1;
- * status -- A (relatively) generic status indicator. It's a bitmask
- with the following bits:
+ switch (type->code ())
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ case TYPE_CODE_RVALUE_REF:
+ return TYPE_LENGTH (type);
+
+ case TYPE_CODE_COMPLEX:
+ return TYPE_LENGTH (type) / 2;
+
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ for (i = 0; i < type->num_fields (); i++)
+ {
+ int falign = mn10300_type_align (type->field (i).type ());
+ while (align < falign)
+ align <<= 1;
+ }
+ return align;
- 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.
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ eligible for returning in registers. */
+ return 256;
- MY_FRAME_IN_FP: The base of the current frame is in the
- frame pointer register ($a2).
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
- 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. */
+ default:
+ internal_error (__FILE__, __LINE__, _("bad switch"));
+ }
+}
-#define MY_FRAME_IN_SP 0x1
-#define MY_FRAME_IN_FP 0x2
-#define NO_MORE_FRAMES 0x4
-
-static CORE_ADDR
-mn10300_analyze_prologue (fi, pc)
- struct frame_info *fi;
- CORE_ADDR pc;
+/* Should call_function allocate stack space for a struct return? */
+static int
+mn10300_use_struct_convention (struct type *type)
{
- CORE_ADDR func_addr, func_end, addr, stop;
- CORE_ADDR stack_size;
- int imm_size;
- unsigned char buf[4];
- int status, found_movm = 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;
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
- /* If we're in start, then give up. */
- if (strcmp (name, "start") == 0)
+ switch (type->code ())
{
- fi->status = NO_MORE_FRAMES;
- return pc;
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ /* Structures with a single field are handled as the field
+ itself. */
+ if (type->num_fields () == 1)
+ return mn10300_use_struct_convention (type->field (0).type ());
+
+ /* Structures with word or double-word size are passed in memory, as
+ long as they require at least word alignment. */
+ if (mn10300_type_align (type) >= 4)
+ return 0;
+
+ return 1;
+
+ /* Arrays are addressable, so they're never returned in
+ registers. This condition can only hold when the array is
+ the only field of a struct or union. */
+ case TYPE_CODE_ARRAY:
+ return 1;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_use_struct_convention (check_typedef (type));
+
+ default:
+ return 0;
}
+}
- /* At the start of a function our frame is in the stack pointer. */
- if (fi)
- fi->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;
+static void
+mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, const gdb_byte *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (type->code () == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
- /* 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.
+ regsz = register_size (gdbarch, reg);
- In this case fi->frame is bogus, we need to fix it. */
- if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
+ if (len <= regsz)
+ regcache->raw_write_part (reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
{
- if (fi->next == NULL)
- fi->frame = read_sp ();
- return fi->pc;
+ regcache->raw_write (reg, valbuf);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache->raw_write_part (reg + 1, 0, len - regsz, valbuf + regsz);
}
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value %d bytes long."), len);
+}
+
+static void
+mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *valbuf)
+{
+ gdb_byte buf[MN10300_MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (type->code () == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
- /* 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)
+ regsz = register_size (gdbarch, reg);
+ gdb_assert (regsz <= MN10300_MAX_REGISTER_SIZE);
+ if (len <= regsz)
+ {
+ regcache->raw_read (reg, buf);
+ memcpy (valbuf, buf, len);
+ }
+ else if (len <= 2 * regsz)
{
- if (fi->next == NULL)
- fi->frame = read_sp ();
- return fi->pc;
+ regcache->raw_read (reg, buf);
+ memcpy (valbuf, buf, regsz);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache->raw_read (reg + 1, buf);
+ memcpy ((char *) valbuf + regsz, buf, len - regsz);
}
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value %d bytes long."), len);
+}
- /* Figure out where to stop scanning. */
- stop = fi ? fi->pc : func_end;
+/* 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. */
- /* Don't walk off the end of the function. */
- stop = stop > func_end ? func_end : stop;
+static enum return_value_convention
+mn10300_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (mn10300_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
- /* Start scanning on the first instruction of this function. */
- addr = func_addr;
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
- /* Suck in two bytes. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- if (fi && fi->next == NULL && fi->status & MY_FRAME_IN_SP)
- fi->frame = read_sp ();
- return addr;
- }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
- /* 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)
+static const char *
+register_name (int reg, const char **regs, long sizeof_regs)
+{
+ if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
+ return NULL;
+ else
+ return regs[reg];
+}
+
+static const char *
+mn10300_generic_register_name (struct gdbarch *gdbarch, int reg)
+{
+ static const 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 const char *
+am33_register_name (struct gdbarch *gdbarch, int reg)
+{
+ static const 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);
+}
+
+static const char *
+am33_2_register_name (struct gdbarch *gdbarch, int reg)
+{
+ static const char *regs[] =
+ {
+ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
+ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
+ "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
+ "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
+ "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
+ "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
+ "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
+ };
+ return register_name (reg, regs, sizeof regs);
+}
+
+static struct type *
+mn10300_register_type (struct gdbarch *gdbarch, int reg)
+{
+ return builtin_type (gdbarch)->builtin_int;
+}
+
+/* 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. */
+constexpr gdb_byte mn10300_break_insn[] = {0xff};
+
+typedef BP_MANIPULATION (mn10300_break_insn) mn10300_breakpoint;
+
+/* Model the semantics of pushing a register onto the stack. This
+ is a helper function for mn10300_analyze_prologue, below. */
+static void
+push_reg (pv_t *regs, struct pv_area *stack, int regnum)
+{
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ stack->store (regs[E_SP_REGNUM], 4, regs[regnum]);
+}
+
+/* Translate an "r" register number extracted from an instruction encoding
+ into a GDB register number. Adapted from a simulator function
+ of the same name; see am33.igen. */
+static int
+translate_rreg (int rreg)
+{
+ /* The higher register numbers actually correspond to the
+ basic machine's address and data registers. */
+ if (rreg > 7 && rreg < 12)
+ return E_A0_REGNUM + rreg - 8;
+ else if (rreg > 11 && rreg < 16)
+ return E_D0_REGNUM + rreg - 12;
+ else
+ return E_E0_REGNUM + rreg;
+}
+
+/* Find saved registers in a 'struct pv_area'; we pass this to pv_area::scan.
+
+ If VALUE is a saved register, ADDR says it was saved at a constant
+ offset from the frame base, and SIZE indicates that the whole
+ register was saved, record its offset in RESULT_UNTYPED. */
+static void
+check_for_saved (void *result_untyped, pv_t addr, CORE_ADDR size, pv_t value)
+{
+ struct mn10300_prologue *result = (struct mn10300_prologue *) result_untyped;
+
+ if (value.kind == pvk_register
+ && value.k == 0
+ && pv_is_register (addr, E_SP_REGNUM)
+ && size == register_size (result->gdbarch, value.reg))
+ result->reg_offset[value.reg] = addr.k;
+}
+
+/* Analyze the prologue to determine where registers are saved,
+ the end of the prologue, etc. The result of this analysis is
+ returned in RESULT. See struct mn10300_prologue above for more
+ information. */
+static void
+mn10300_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct mn10300_prologue *result)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR pc;
+ int rn;
+ pv_t regs[MN10300_MAX_NUM_REGS];
+ CORE_ADDR after_last_frame_setup_insn = start_pc;
+ int am33_mode = AM33_MODE (gdbarch);
+
+ memset (result, 0, sizeof (*result));
+ result->gdbarch = gdbarch;
+
+ for (rn = 0; rn < MN10300_MAX_NUM_REGS; rn++)
{
- if (fi)
- fi->status = NO_MORE_FRAMES;
- return addr;
+ regs[rn] = pv_register (rn, 0);
+ result->reg_offset[rn] = 1;
}
+ pv_area stack (E_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+
+ /* The typical call instruction will have saved the return address on the
+ stack. Space for the return address has already been preallocated in
+ the caller's frame. It's possible, such as when using -mrelax with gcc
+ that other registers were saved as well. If this happens, we really
+ have no chance of deciphering the frame. DWARF info can save the day
+ when this happens. */
+ stack.store (regs[E_SP_REGNUM], 4, regs[E_PC_REGNUM]);
+
+ pc = start_pc;
+ while (pc < limit_pc)
+ {
+ int status;
+ gdb_byte instr[2];
- /* Now look for movm [regs],sp, which saves the callee saved registers.
+ /* Instructions can be as small as one byte; however, we usually
+ need at least two bytes to do the decoding, so fetch that many
+ to begin with. */
+ status = target_read_memory (pc, instr, 2);
+ if (status != 0)
+ break;
- 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)
- {
- found_movm = 1;
- addr += 2;
+ /* movm [regs], sp */
+ if (instr[0] == 0xcf)
+ {
+ gdb_byte save_mask;
+
+ save_mask = instr[1];
+
+ if ((save_mask & movm_exreg0_bit) && am33_mode)
+ {
+ push_reg (regs, &stack, E_E2_REGNUM);
+ push_reg (regs, &stack, E_E3_REGNUM);
+ }
+ if ((save_mask & movm_exreg1_bit) && am33_mode)
+ {
+ push_reg (regs, &stack, E_E4_REGNUM);
+ push_reg (regs, &stack, E_E5_REGNUM);
+ push_reg (regs, &stack, E_E6_REGNUM);
+ push_reg (regs, &stack, E_E7_REGNUM);
+ }
+ if ((save_mask & movm_exother_bit) && am33_mode)
+ {
+ push_reg (regs, &stack, E_E0_REGNUM);
+ push_reg (regs, &stack, E_E1_REGNUM);
+ push_reg (regs, &stack, E_MDRQ_REGNUM);
+ push_reg (regs, &stack, E_MCRH_REGNUM);
+ push_reg (regs, &stack, E_MCRL_REGNUM);
+ push_reg (regs, &stack, E_MCVF_REGNUM);
+ }
+ if (save_mask & movm_d2_bit)
+ push_reg (regs, &stack, E_D2_REGNUM);
+ if (save_mask & movm_d3_bit)
+ push_reg (regs, &stack, E_D3_REGNUM);
+ if (save_mask & movm_a2_bit)
+ push_reg (regs, &stack, E_A2_REGNUM);
+ if (save_mask & movm_a3_bit)
+ push_reg (regs, &stack, E_A3_REGNUM);
+ if (save_mask & movm_other_bit)
+ {
+ push_reg (regs, &stack, E_D0_REGNUM);
+ push_reg (regs, &stack, E_D1_REGNUM);
+ push_reg (regs, &stack, E_A0_REGNUM);
+ push_reg (regs, &stack, E_A1_REGNUM);
+ push_reg (regs, &stack, E_MDR_REGNUM);
+ push_reg (regs, &stack, E_LIR_REGNUM);
+ push_reg (regs, &stack, E_LAR_REGNUM);
+ /* The `other' bit leaves a blank area of four bytes at
+ the beginning of its block of saved registers, making
+ it 32 bytes long in total. */
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ }
+
+ pc += 2;
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov sp, aN */
+ else if ((instr[0] & 0xfc) == 0x3c)
+ {
+ int aN = instr[0] & 0x03;
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
+ regs[E_A0_REGNUM + aN] = regs[E_SP_REGNUM];
+
+ pc += 1;
+ if (aN == 3)
+ after_last_frame_setup_insn = pc;
+ }
+ /* mov aM, aN */
+ else if ((instr[0] & 0xf0) == 0x90
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
{
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && fi->next == NULL)
- fi->frame = read_sp ();
+ int aN = instr[0] & 0x03;
+ int aM = (instr[0] & 0x0c) >> 2;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
+ regs[E_A0_REGNUM + aN] = regs[E_A0_REGNUM + aM];
+
+ pc += 1;
}
+ /* mov dM, dN */
+ else if ((instr[0] & 0xf0) == 0x80
+ && (instr[0] & 0x03) != ((instr[0] & 0x0c) >> 2))
+ {
+ int dN = instr[0] & 0x03;
+ int dM = (instr[0] & 0x0c) >> 2;
- /* Get the next two bytes so the prologue scan can continue. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
+ regs[E_D0_REGNUM + dN] = regs[E_D0_REGNUM + dM];
+
+ pc += 1;
+ }
+ /* mov aM, dN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xd0)
{
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && fi->next == NULL)
- fi->frame = read_sp ();
+ int dN = instr[1] & 0x03;
+ int aM = (instr[1] & 0x0c) >> 2;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
+ regs[E_D0_REGNUM + dN] = regs[E_A0_REGNUM + aM];
+
+ pc += 2;
}
- }
+ /* mov dM, aN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xe0)
+ {
+ int aN = instr[1] & 0x03;
+ int dM = (instr[1] & 0x0c) >> 2;
- /* Now see if we set up a frame pointer via "mov sp,a3" */
- if (buf[0] == 0x3f)
- {
- addr += 1;
+ regs[E_A0_REGNUM + aN] = regs[E_D0_REGNUM + dM];
- /* The frame pointer is now valid. */
- if (fi)
+ pc += 2;
+ }
+ /* add imm8, SP */
+ else if (instr[0] == 0xf8 && instr[1] == 0xfe)
{
- fi->status |= MY_FRAME_IN_FP;
- fi->status &= ~MY_FRAME_IN_SP;
+ gdb_byte buf[1];
+ LONGEST imm8;
+
+
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
+
+ imm8 = extract_signed_integer (buf, 1, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm8);
+
+ pc += 3;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
}
+ /* add imm16, SP */
+ else if (instr[0] == 0xfa && instr[1] == 0xfe)
+ {
+ gdb_byte buf[2];
+ LONGEST imm16;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- /* Quit now if we're beyond the stop point. */
- if (addr >= stop)
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm16);
+
+ pc += 4;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
+ }
+ /* add imm32, SP */
+ else if (instr[0] == 0xfc && instr[1] == 0xfe)
{
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], imm32);
+
+ pc += 6;
+ /* Stack pointer adjustments are frame related. */
+ after_last_frame_setup_insn = pc;
}
+ /* add imm8, aN */
+ else if ((instr[0] & 0xfc) == 0x20)
+ {
+ int aN;
+ LONGEST imm8;
- /* Get two more bytes so scanning can continue. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
+ aN = instr[0] & 0x03;
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
+
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm8);
+
+ pc += 2;
+ }
+ /* add imm16, aN */
+ else if (instr[0] == 0xfa && (instr[1] & 0xfc) == 0xd0)
{
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
+ int aN;
+ LONGEST imm16;
+ gdb_byte buf[2];
+
+ aN = instr[1] & 0x03;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm16);
+
+ pc += 4;
}
- }
-
- /* 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. */
- if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
- fi->frame = read_sp ();
+ /* add imm32, aN */
+ else if (instr[0] == 0xfc && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm32;
+ gdb_byte buf[4];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
- }
+ aN = instr[1] & 0x03;
- 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;
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- 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)
+ imm32 = extract_signed_integer (buf, 2, byte_order);
+
+ regs[E_A0_REGNUM + aN] = pv_add_constant (regs[E_A0_REGNUM + aN],
+ imm32);
+ pc += 6;
+ }
+ /* fmov fsM, (rN) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x30)
{
- /* Fix fi->frame if it's bogus at this point. */
- if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
- fi->frame = read_sp ();
+ int fsM, sM, Y, rN;
+ gdb_byte buf[1];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
+ stack.store (regs[translate_rreg (rN)], 4,
+ regs[E_FS0_REGNUM + fsM]);
+
+ pc += 3;
}
+ /* fmov fsM, (sp) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ gdb_byte buf[1];
- /* Note the size of the stack in the frame info structure. */
- stack_size = extract_signed_integer (buf, imm_size);
- if (fi)
- fi->stack_size = stack_size;
+ Y = (instr[1] & 0x02) >> 1;
- /* We just consumed 2 + imm_size bytes. */
- addr += 2 + imm_size;
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
- /* No more prologue insns follow, so begin preparation to return. */
- /* Fix fi->frame if it's bogus at this point. */
- if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
- fi->frame = read_sp () - stack_size;
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- return addr;
- }
+ stack.store (regs[E_SP_REGNUM], 4,
+ regs[E_FS0_REGNUM + fsM]);
- /* 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. */
- if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP))
- fi->frame = read_sp ();
+ pc += 3;
+ }
+ /* fmov fsM, (rN, rI) */
+ else if (instr[0] == 0xfb && instr[1] == 0x37)
+ {
+ int fsM, sM, Z, rN, rI;
+ gdb_byte buf[2];
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, found_movm);
- 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? */
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
-CORE_ADDR
-mn10300_frame_chain (fi)
- struct frame_info *fi;
-{
- struct frame_info dummy_frame;
+ rI = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ sM = (buf[1] & 0xf0) >> 4;
+ Z = (buf[1] & 0x02) >> 1;
+ fsM = (Z << 4) | sM;
+
+ stack.store (pv_add (regs[translate_rreg (rN)],
+ regs[translate_rreg (rI)]),
+ 4, regs[E_FS0_REGNUM + fsM]);
- /* Walk through the prologue to determine the stack size,
- location of saved registers, end of the prologue, etc. */
- if (fi->status == 0)
- mn10300_analyze_prologue (fi, (CORE_ADDR)0);
+ pc += 4;
+ }
+ /* fmov fsM, (d8, rN) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d8;
+ gdb_byte buf[2];
- /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
- if (fi->status & NO_MORE_FRAMES)
- return 0;
+ Y = (instr[1] & 0x02) >> 1;
- /* Now that we've analyzed our prologue, determine the frame
- pointer for our caller.
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
- If our caller has a frame pointer, then we need to
- find the entry value of $a3 to our function.
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
- If fsr.regs[7] is nonzero, then it's at the memory
- location pointed to by fsr.regs[7].
+ stack.store (pv_add_constant (regs[translate_rreg (rN)], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
- Else it's still in $a3.
+ pc += 4;
+ }
+ /* fmov fsM, (d24, rN) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d24;
+ gdb_byte buf[4];
- 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.
+ Y = (instr[1] & 0x02) >> 1;
- So we set up a dummy frame and call mn10300_analyze_prologue to
- find stuff for us. */
- dummy_frame.pc = FRAME_SAVED_PC (fi);
- dummy_frame.frame = fi->frame;
- memset (dummy_frame.fsr.regs, '\000', sizeof dummy_frame.fsr.regs);
- dummy_frame.status = 0;
- dummy_frame.stack_size = 0;
- mn10300_analyze_prologue (&dummy_frame);
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
- if (dummy_frame.status & MY_FRAME_IN_FP)
- {
- /* Our caller has a frame pointer. So find the frame in $a3 or
- in the stack. */
- if (fi->fsr.regs[7])
- return (read_memory_integer (fi->fsr.regs[FP_REGNUM], REGISTER_SIZE));
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ stack.store (pv_add_constant (regs[translate_rreg (rN)], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 6;
+ }
+ /* fmov fsM, (d32, rN) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x30)
+ {
+ int fsM, sM, Y, rN;
+ LONGEST d32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
+
+ stack.store (pv_add_constant (regs[translate_rreg (rN)], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 7;
+ }
+ /* fmov fsM, (d8, SP) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d8;
+ gdb_byte buf[2];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ stack.store (pv_add_constant (regs[E_SP_REGNUM], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 4;
+ }
+ /* fmov fsM, (d24, SP) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d24;
+ gdb_byte buf[4];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ stack.store (pv_add_constant (regs[E_SP_REGNUM], d24),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 6;
+ }
+ /* fmov fsM, (d32, SP) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x34)
+ {
+ int fsM, sM, Y;
+ LONGEST d32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+ d32 = extract_signed_integer (&buf[1], 4, byte_order);
+
+ stack.store (pv_add_constant (regs[E_SP_REGNUM], d32),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ pc += 7;
+ }
+ /* fmov fsM, (rN+) */
+ else if (instr[0] == 0xf9 && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ gdb_byte buf[1];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+
+ rN_regnum = translate_rreg (rN);
+
+ stack.store (regs[rN_regnum], 4,
+ regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], 4);
+
+ pc += 3;
+ }
+ /* fmov fsM, (rN+, imm8) */
+ else if (instr[0] == 0xfb && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm8;
+ gdb_byte buf[2];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ stack.store (regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm8);
+
+ pc += 4;
+ }
+ /* fmov fsM, (rN+, imm24) */
+ else if (instr[0] == 0xfd && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm24;
+ gdb_byte buf[4];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm24 = extract_signed_integer (&buf[1], 3, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ stack.store (regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm24);
+
+ pc += 6;
+ }
+ /* fmov fsM, (rN+, imm32) */
+ else if (instr[0] == 0xfe && (instr[1] & 0xfd) == 0x31)
+ {
+ int fsM, sM, Y, rN, rN_regnum;
+ LONGEST imm32;
+ gdb_byte buf[5];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 5);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ rN = buf[0] & 0x0f;
+ fsM = (Y << 4) | sM;
+ imm32 = extract_signed_integer (&buf[1], 4, byte_order);
+
+ rN_regnum = translate_rreg (rN);
+
+ stack.store (regs[rN_regnum], 4, regs[E_FS0_REGNUM + fsM]);
+ regs[rN_regnum] = pv_add_constant (regs[rN_regnum], imm32);
+
+ pc += 7;
+ }
+ /* mov imm8, aN */
+ else if ((instr[0] & 0xf0) == 0x90)
+ {
+ int aN = instr[0] & 0x03;
+ LONGEST imm8;
+
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
+
+ regs[E_A0_REGNUM + aN] = pv_constant (imm8);
+ pc += 2;
+ }
+ /* mov imm16, aN */
+ else if ((instr[0] & 0xfc) == 0x24)
+ {
+ int aN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
+
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm16);
+ pc += 3;
+ }
+ /* mov imm32, aN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xdc))
+ {
+ int aN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_A0_REGNUM + aN] = pv_constant (imm32);
+ pc += 6;
+ }
+ /* mov imm8, dN */
+ else if ((instr[0] & 0xf0) == 0x80)
+ {
+ int dN = instr[0] & 0x03;
+ LONGEST imm8;
+
+ imm8 = extract_signed_integer (&instr[1], 1, byte_order);
+
+ regs[E_D0_REGNUM + dN] = pv_constant (imm8);
+ pc += 2;
+ }
+ /* mov imm16, dN */
+ else if ((instr[0] & 0xfc) == 0x2c)
+ {
+ int dN = instr[0] & 0x03;
+ gdb_byte buf[2];
+ LONGEST imm16;
+
+ status = target_read_memory (pc + 1, buf, 2);
+ if (status != 0)
+ break;
+
+ imm16 = extract_signed_integer (buf, 2, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm16);
+ pc += 3;
+ }
+ /* mov imm32, dN */
+ else if (instr[0] == 0xfc && ((instr[1] & 0xfc) == 0xcc))
+ {
+ int dN = instr[1] & 0x03;
+ gdb_byte buf[4];
+ LONGEST imm32;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ imm32 = extract_signed_integer (buf, 4, byte_order);
+ regs[E_D0_REGNUM + dN] = pv_constant (imm32);
+ pc += 6;
+ }
else
- return read_register (FP_REGNUM);
+ {
+ /* We've hit some instruction that we don't recognize. Hopefully,
+ we have enough to do prologue analysis. */
+ break;
+ }
}
- else
+
+ /* Is the frame size (offset, really) a known constant? */
+ if (pv_is_register (regs[E_SP_REGNUM], E_SP_REGNUM))
+ result->frame_size = regs[E_SP_REGNUM].k;
+
+ /* Was the frame pointer initialized? */
+ if (pv_is_register (regs[E_A3_REGNUM], E_SP_REGNUM))
{
- int adjust = 0;
-
- adjust += (fi->fsr.regs[2] ? 4 : 0);
- adjust += (fi->fsr.regs[3] ? 4 : 0);
- adjust += (fi->fsr.regs[6] ? 4 : 0);
- adjust += (fi->fsr.regs[7] ? 4 : 0);
- /* start-sanitize-am33 */
- adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0);
- /* end-sanitize-am33 */
-
- /* 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_frame.stack_size;
+ result->has_frame_ptr = 1;
+ result->frame_ptr_offset = regs[E_A3_REGNUM].k;
}
+
+ /* Record where all the registers were saved. */
+ stack.scan (check_for_saved, (void *) result);
+
+ result->prologue_end = after_last_frame_setup_insn;
}
/* 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;
+static CORE_ADDR
+mn10300_skip_prologue (struct gdbarch *gdbarch, 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);
-}
+ const char *name;
+ CORE_ADDR func_addr, func_end;
+ struct mn10300_prologue p;
+ /* Try to find the extent of the function that contains PC. */
+ if (!find_pc_partial_function (pc, &name, &func_addr, &func_end))
+ return pc;
-/* Function: pop_frame
- This routine gets called when either the user uses the `return'
- command, or the call dummy breakpoint gets hit. */
+ mn10300_analyze_prologue (gdbarch, pc, func_end, &p);
+ return p.prologue_end;
+}
-void
-mn10300_pop_frame (frame)
- struct frame_info *frame;
+/* Wrapper for mn10300_analyze_prologue: find the function start;
+ use the current frame PC as the limit, then
+ invoke mn10300_analyze_prologue and return its result. */
+static struct mn10300_prologue *
+mn10300_analyze_frame_prologue (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- int regnum;
+ if (!*this_prologue_cache)
+ {
+ CORE_ADDR func_start, stop_addr;
+
+ *this_prologue_cache = FRAME_OBSTACK_ZALLOC (struct mn10300_prologue);
- if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
- generic_pop_dummy_frame ();
+ func_start = get_frame_func (this_frame);
+ stop_addr = get_frame_pc (this_frame);
+
+ /* If we couldn't find any function containing the PC, then
+ just initialize the prologue cache, but don't do anything. */
+ if (!func_start)
+ stop_addr = func_start;
+
+ mn10300_analyze_prologue (get_frame_arch (this_frame),
+ func_start, stop_addr,
+ ((struct mn10300_prologue *)
+ *this_prologue_cache));
+ }
+
+ return (struct mn10300_prologue *) *this_prologue_cache;
+}
+
+/* Given the next frame and a prologue cache, return this frame's
+ base. */
+static CORE_ADDR
+mn10300_frame_base (struct frame_info *this_frame, void **this_prologue_cache)
+{
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+
+ /* In functions that use alloca, the distance between the stack
+ pointer and the frame base varies dynamically, so we can't use
+ the SP plus static information like prologue analysis to find the
+ frame base. However, such functions must have a frame pointer,
+ to be able to restore the SP on exit. So whenever we do have a
+ frame pointer, use that to find the base. */
+ if (p->has_frame_ptr)
+ {
+ CORE_ADDR fp = get_frame_register_unsigned (this_frame, E_A3_REGNUM);
+ return fp - p->frame_ptr_offset;
+ }
else
{
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ return sp - p->frame_size;
+ }
+}
- /* Restore any saved registers. */
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->fsr.regs[regnum] != 0)
- {
- ULONGEST value;
+static void
+mn10300_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ *this_id = frame_id_build (mn10300_frame_base (this_frame,
+ this_prologue_cache),
+ get_frame_func (this_frame));
- value = read_memory_unsigned_integer (frame->fsr.regs[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
+}
- /* Actually cut back the stack. */
- write_register (SP_REGNUM, FRAME_FP (frame));
+static struct value *
+mn10300_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct mn10300_prologue *p
+ = mn10300_analyze_frame_prologue (this_frame, this_prologue_cache);
+ CORE_ADDR frame_base = mn10300_frame_base (this_frame, this_prologue_cache);
+
+ if (regnum == E_SP_REGNUM)
+ return frame_unwind_got_constant (this_frame, regnum, frame_base);
+
+ /* If prologue analysis says we saved this register somewhere,
+ return a description of the stack slot holding it. */
+ if (p->reg_offset[regnum] != 1)
+ return frame_unwind_got_memory (this_frame, regnum,
+ frame_base + p->reg_offset[regnum]);
+
+ /* Otherwise, presume we haven't changed the value of this
+ register, and get it from the next frame. */
+ return frame_unwind_got_register (this_frame, regnum, regnum);
+}
- /* Don't we need to set the PC?!? XXX FIXME. */
- }
+static const struct frame_unwind mn10300_frame_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ mn10300_frame_this_id,
+ mn10300_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
- /* Throw away any cached frame information. */
- flush_cached_frames ();
+static void
+mn10300_frame_unwind_init (struct gdbarch *gdbarch)
+{
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &mn10300_frame_unwind);
}
-/* 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;
+/* Function: push_dummy_call
+ *
+ * Set up machine state for a target call, including
+ * function arguments, stack, return address, etc.
+ *
+ */
+
+static CORE_ADDR
+mn10300_push_dummy_call (struct gdbarch *gdbarch,
+ struct value *target_func,
+ struct regcache *regcache,
+ CORE_ADDR bp_addr,
+ int nargs, struct value **args,
+ CORE_ADDR sp,
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
- int argnum = 0;
- int len = 0;
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ const int push_size = register_size (gdbarch, E_PC_REGNUM);
+ int regs_used;
+ int len, arg_len;
int stack_offset = 0;
- int regsused = struct_return ? 1 : 0;
+ int argnum;
+ const gdb_byte *val;
+ gdb_byte valbuf[MN10300_MAX_REGISTER_SIZE];
/* This should be a nop, but align the stack just in case something
went wrong. Stacks are four byte aligned on the mn10300. */
XXX This doesn't appear to handle pass-by-invisible reference
arguments. */
- for (argnum = 0; argnum < nargs; argnum++)
+ regs_used = (return_method == return_method_struct) ? 1 : 0;
+ for (len = 0, argnum = 0; argnum < nargs; argnum++)
{
- int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
-
- while (regsused < 2 && arg_length > 0)
+ arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
+ while (regs_used < 2 && arg_len > 0)
{
- regsused++;
- arg_length -= 4;
+ regs_used++;
+ arg_len -= push_size;
}
- len += arg_length;
+ len += arg_len;
}
/* Allocate stack space. */
sp -= len;
- regsused = struct_return ? 1 : 0;
- /* Push all arguments onto the stack. */
- for (argnum = 0; argnum < nargs; argnum++)
+ if (return_method == return_method_struct)
{
- int len;
- char *val;
+ regs_used = 1;
+ regcache_cooked_write_unsigned (regcache, E_D0_REGNUM, struct_addr);
+ }
+ else
+ regs_used = 0;
- /* XXX Check this. What about UNIONS? */
- if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
- && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+ /* Push all arguments onto the stack. */
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ /* FIXME what about structs? Unions? */
+ if (value_type (*args)->code () == 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);
+ /* Change to pointer-to-type. */
+ arg_len = push_size;
+ gdb_assert (push_size <= MN10300_MAX_REGISTER_SIZE);
+ store_unsigned_integer (valbuf, push_size, byte_order,
+ value_address (*args));
+ val = &valbuf[0];
}
else
{
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *)VALUE_CONTENTS (*args);
+ arg_len = TYPE_LENGTH (value_type (*args));
+ val = value_contents (*args);
}
- while (regsused < 2 && len > 0)
+ while (regs_used < 2 && arg_len > 0)
{
- write_register (regsused, extract_unsigned_integer (val, 4));
- val += 4;
- len -= 4;
- regsused++;
+ regcache_cooked_write_unsigned (regcache, regs_used,
+ extract_unsigned_integer (val, push_size, byte_order));
+ val += push_size;
+ arg_len -= push_size;
+ regs_used++;
}
- while (len > 0)
+ while (arg_len > 0)
{
- write_memory (sp + stack_offset, val, 4);
- len -= 4;
- val += 4;
- stack_offset += 4;
+ write_memory (sp + stack_offset, val, push_size);
+ arg_len -= push_size;
+ val += push_size;
+ stack_offset += push_size;
}
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;
-{
- unsigned char buf[4];
-
- store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ());
- write_memory (sp - 4, buf, 4);
- return sp - 4;
-}
+ /* Push the return address that contains the magic breakpoint. */
+ sp -= 4;
+ write_memory_unsigned_integer (sp, push_size, byte_order, bp_addr);
+
+ /* The CPU also writes the return address always into the
+ MDR register on "call". */
+ regcache_cooked_write_unsigned (regcache, E_MDR_REGNUM, bp_addr);
+
+ /* Update $sp. */
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
+
+ /* On the mn10300, it's possible to move some of the stack adjustment
+ and saving of the caller-save registers out of the prologue and
+ into the call sites. (When using gcc, this optimization can
+ occur when using the -mrelax switch.) If this occurs, the dwarf2
+ info will reflect this fact. We can test to see if this is the
+ case by creating a new frame using the current stack pointer and
+ the address of the function that we're about to call. We then
+ unwind SP and see if it's different than the SP of our newly
+ created frame. If the SP values are the same, the caller is not
+ expected to allocate any additional stack. On the other hand, if
+ the SP values are different, the difference determines the
+ additional stack that must be allocated.
+
+ Note that we don't update the return value though because that's
+ the value of the stack just after pushing the arguments, but prior
+ to performing the call. This value is needed in order to
+ construct the frame ID of the dummy call. */
+ {
+ CORE_ADDR func_addr = find_function_addr (target_func, NULL);
+ CORE_ADDR unwound_sp
+ = gdbarch_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
+ if (sp != unwound_sp)
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
+ sp - (unwound_sp - sp));
+ }
-/* Function: store_struct_return (addr,sp)
- Store the structure value return address for an inferior function
- call. */
-
-CORE_ADDR
-mn10300_store_struct_return (addr, sp)
- 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 (fi)
- struct frame_info *fi;
-{
- int adjust = 0;
-
- adjust += (fi->fsr.regs[2] ? 4 : 0);
- adjust += (fi->fsr.regs[3] ? 4 : 0);
- adjust += (fi->fsr.regs[6] ? 4 : 0);
- adjust += (fi->fsr.regs[7] ? 4 : 0);
- /* start-sanitize-am33 */
- adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0);
- adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0);
- /* end-sanitize-am33 */
-
- return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE));
-}
-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;
+/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
+ mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
+ register number. Why don't Dwarf2 and GDB use the same numbering?
+ Who knows? But since people have object files lying around with
+ the existing Dwarf2 numbering, and other people have written stubs
+ to work with the existing GDB, neither of them can change. So we
+ just have to cope. */
+static int
+mn10300_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2)
{
- generic_get_saved_register (raw_buffer, optimized, addrp,
- frame, regnum, lval);
-}
+ /* This table is supposed to be shaped like the gdbarch_register_name
+ initializer in gcc/config/mn10300/mn10300.h. Registers which
+ appear in GCC's numbering, but have no counterpart in GDB's
+ world, are marked with a -1. */
+ static int dwarf2_to_gdb[] = {
+ E_D0_REGNUM, E_D1_REGNUM, E_D2_REGNUM, E_D3_REGNUM,
+ E_A0_REGNUM, E_A1_REGNUM, E_A2_REGNUM, E_A3_REGNUM,
+ -1, E_SP_REGNUM,
-/* Function: 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().
+ E_E0_REGNUM, E_E1_REGNUM, E_E2_REGNUM, E_E3_REGNUM,
+ E_E4_REGNUM, E_E5_REGNUM, E_E6_REGNUM, E_E7_REGNUM,
- 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.
+ E_FS0_REGNUM + 0, E_FS0_REGNUM + 1, E_FS0_REGNUM + 2, E_FS0_REGNUM + 3,
+ E_FS0_REGNUM + 4, E_FS0_REGNUM + 5, E_FS0_REGNUM + 6, E_FS0_REGNUM + 7,
- 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). */
+ E_FS0_REGNUM + 8, E_FS0_REGNUM + 9, E_FS0_REGNUM + 10, E_FS0_REGNUM + 11,
+ E_FS0_REGNUM + 12, E_FS0_REGNUM + 13, E_FS0_REGNUM + 14, E_FS0_REGNUM + 15,
-void
-mn10300_init_extra_frame_info (fi)
- struct frame_info *fi;
-{
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
+ E_FS0_REGNUM + 16, E_FS0_REGNUM + 17, E_FS0_REGNUM + 18, E_FS0_REGNUM + 19,
+ E_FS0_REGNUM + 20, E_FS0_REGNUM + 21, E_FS0_REGNUM + 22, E_FS0_REGNUM + 23,
+
+ E_FS0_REGNUM + 24, E_FS0_REGNUM + 25, E_FS0_REGNUM + 26, E_FS0_REGNUM + 27,
+ E_FS0_REGNUM + 28, E_FS0_REGNUM + 29, E_FS0_REGNUM + 30, E_FS0_REGNUM + 31,
- memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
- fi->status = 0;
- fi->stack_size = 0;
+ E_MDR_REGNUM, E_PSW_REGNUM, E_PC_REGNUM
+ };
- mn10300_analyze_prologue (fi, 0);
+ if (dwarf2 < 0
+ || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
+ return -1;
+
+ return dwarf2_to_gdb[dwarf2];
}
-/* This can be made more generic later. */
-static void
-set_machine_hook (filename)
- char *filename;
+static struct gdbarch *
+mn10300_gdbarch_init (struct gdbarch_info info,
+ struct gdbarch_list *arches)
{
- int i;
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep;
+ int num_regs;
- if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300
- || bfd_get_mach (exec_bfd) == 0)
- {
- for (i = 0; i < NUM_REGS; i++)
- reg_names[i] = mn10300_generic_register_names[i];
- }
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ tdep = XCNEW (struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
- /* start-sanitize-am33 */
- if (bfd_get_mach (exec_bfd) == bfd_mach_am33)
+ switch (info.bfd_arch_info->mach)
{
- for (i = 0; i < NUM_REGS; i++)
- reg_names[i] = am33_register_names[i];
+ case 0:
+ case bfd_mach_mn10300:
+ set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
+ tdep->am33_mode = 0;
+ num_regs = 32;
+ break;
+ case bfd_mach_am33:
+ set_gdbarch_register_name (gdbarch, am33_register_name);
+ tdep->am33_mode = 1;
+ num_regs = 32;
+ break;
+ case bfd_mach_am33_2:
+ set_gdbarch_register_name (gdbarch, am33_2_register_name);
+ tdep->am33_mode = 2;
+ num_regs = 64;
+ set_gdbarch_fp0_regnum (gdbarch, 32);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("mn10300_gdbarch_init: Unknown mn10300 variant"));
+ break;
}
- /* end-sanitize-am33 */
+
+ /* By default, chars are unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
+
+ /* Registers. */
+ set_gdbarch_num_regs (gdbarch, num_regs);
+ set_gdbarch_register_type (gdbarch, mn10300_register_type);
+ set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
+
+ /* Stack unwinding. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ /* Breakpoints. */
+ set_gdbarch_breakpoint_kind_from_pc (gdbarch,
+ mn10300_breakpoint::kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch,
+ mn10300_breakpoint::bp_from_kind);
+ /* decr_pc_after_break? */
+
+ /* Stage 2 */
+ set_gdbarch_return_value (gdbarch, mn10300_return_value);
+
+ /* Stage 3 -- get target calls working. */
+ set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
+ /* set_gdbarch_return_value (store, extract) */
+
+
+ mn10300_frame_unwind_init (gdbarch);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
+ return gdbarch;
}
+
+/* Dump out the mn10300 specific architecture information. */
+static void
+mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
+ tdep->am33_mode);
+}
+
+void _initialize_mn10300_tdep ();
void
_initialize_mn10300_tdep ()
{
-/* printf("_initialize_mn10300_tdep\n"); */
-
- tm_print_insn = print_insn_mn10300;
-
- specify_exec_file_hook (set_machine_hook);
+ gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
}
projects / deliverable / binutils-gdb.git / blobdiff