/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997 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"
-/* Info gleaned from scanning a function's prologue. */
+#include "mn10300-tdep.h"
+
+
+/* The am33-2 has 64 registers. */
+#define MN10300_MAX_NUM_REGS 64
-struct pifsr /* Info about one saved reg */
+/* Big enough to hold the size of the largest register in bytes. */
+#define MN10300_MAX_REGISTER_SIZE 64
+
+/* This structure holds the results of a prologue analysis. */
+struct mn10300_prologue
{
- int framereg; /* Frame reg (SP or FP) */
- int offset; /* Offset from framereg */
- int reg; /* Saved register number */
+ /* 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.
+
+ 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;
+
+ /* Non-zero if this function has initialized the frame pointer from
+ the stack pointer, zero otherwise. */
+ int has_frame_ptr;
+
+ /* 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;
+
+ /* 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;
+
+ /* 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];
};
-struct prologue_info
+
+/* Compute the alignment required by a type. */
+
+static int
+mn10300_type_align (struct type *type)
{
- int framereg;
- int frameoffset;
- int start_function;
- struct pifsr *pifsrs;
-};
+ int i, align = 1;
-/* Function: frame_chain
- Figure out and return the caller's frame pointer given current
- frame_info struct.
+ 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;
+
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ eligible for returning in registers. */
+ return 256;
- We start out knowing the current pc, current sp, current fp.
- We want to determine the caller's fp and caller's pc. To do this
- correctly, we have to be able to handle the case where we are in the
- middle of the prologue which involves scanning the prologue.
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
- 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?
-*/
+ default:
+ internal_error (__FILE__, __LINE__, _("bad switch"));
+ }
+}
-CORE_ADDR
-mn10300_frame_chain (fi)
- struct frame_info *fi;
+/* Should call_function allocate stack space for a struct return? */
+static int
+mn10300_use_struct_convention (struct type *type)
{
- struct prologue_info pi;
- CORE_ADDR callers_pc, callers_fp, curr_sp;
- CORE_ADDR past_prologue_addr;
- int past_prologue = 1; /* default to being past prologue */
- int n_movm_args = 4;
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
- struct pifsr *pifsr, *pifsr_tmp;
+ switch (type->code ())
+ {
+ 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;
+ }
+}
- /* current pc is fi->pc */
- /* current fp is fi->frame */
+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;
- /* current sp is: */
- curr_sp = read_register (SP_REGNUM);
+ regsz = register_size (gdbarch, reg);
-/*
- printf("curr pc = 0x%x ; curr fp = 0x%x ; curr sp = 0x%x\n",
- fi->pc, fi->frame, curr_sp);
-*/
+ if (len <= regsz)
+ regcache->raw_write_part (reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
+ {
+ 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);
+}
- /* first inst after prologue is: */
- past_prologue_addr = mn10300_skip_prologue (fi->pc);
+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;
- /* Are we in the prologue? */
- /* Yes if mn10300_skip_prologue returns an address after the
- current pc in which case we have to scan prologue */
- if (fi->pc < mn10300_skip_prologue (fi->pc))
- past_prologue = 0;
+ if (type->code () == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
- /* scan prologue if we're not past it */
- if (!past_prologue)
+ regsz = register_size (gdbarch, reg);
+ gdb_assert (regsz <= MN10300_MAX_REGISTER_SIZE);
+ if (len <= regsz)
{
- /* printf("scanning prologue\n"); */
- /* FIXME -- fill out this case later */
- return 0x666; /* bogus value */
+ regcache->raw_read (reg, buf);
+ memcpy (valbuf, buf, len);
}
-
- if (past_prologue) /* if we don't need to scan the prologue */
+ else if (len <= 2 * regsz)
{
-/* printf("we're past the prologue\n"); */
- callers_pc = fi->frame - REGISTER_SIZE;
- callers_fp = fi->frame - ((n_movm_args + 1) * REGISTER_SIZE);
-/*
- printf("callers_pc = 0x%x ; callers_fp = 0x%x\n",
- callers_pc, callers_fp);
-
- printf("*callers_pc = 0x%x ; *callers_fp = 0x%x\n",
- read_memory_integer(callers_pc, REGISTER_SIZE),
- read_memory_integer(callers_fp, REGISTER_SIZE));
-*/
- return read_memory_integer(callers_fp, REGISTER_SIZE);
+ 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);
+}
+
+/* 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. */
+
+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;
+
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+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];
+}
- /* we don't get here */
+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);
}
-/* Function: find_callers_reg
- Find REGNUM on the stack. Otherwise, it's in an active register.
- One thing we might want to do here is to check REGNUM against the
- clobber mask, and somehow flag it as invalid if it isn't saved on
- the stack somewhere. This would provide a graceful failure mode
- when trying to get the value of caller-saves registers for an inner
- frame. */
-
-CORE_ADDR
-mn10300_find_callers_reg (fi, regnum)
- struct frame_info *fi;
- int regnum;
+
+static const char *
+am33_register_name (struct gdbarch *gdbarch, int reg)
{
-/* printf("mn10300_find_callers_reg\n"); */
+ 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);
+}
- for (; fi; fi = fi->next)
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return generic_read_register_dummy (fi->pc, fi->frame, regnum);
- else if (fi->fsr.regs[regnum] != 0)
- return read_memory_unsigned_integer (fi->fsr.regs[regnum],
- REGISTER_RAW_SIZE(regnum));
+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);
+}
- return read_register (regnum);
+static struct type *
+mn10300_register_type (struct gdbarch *gdbarch, int reg)
+{
+ return builtin_type (gdbarch)->builtin_int;
}
-/* Function: skip_prologue
- Return the address of the first inst past the prologue of the function.
-*/
+/* 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};
-CORE_ADDR
-mn10300_skip_prologue (pc)
- CORE_ADDR pc;
+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)
{
- CORE_ADDR func_addr, func_end;
+ regs[E_SP_REGNUM] = pv_add_constant (regs[E_SP_REGNUM], -4);
+ stack->store (regs[E_SP_REGNUM], 4, regs[regnum]);
+}
-/* printf("mn10300_skip_prologue\n"); */
+/* 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.
- /* See what the symbol table says */
+ 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 (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ 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++)
{
- struct symtab_and_line sal;
+ 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];
+
+ /* 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;
+
+ /* 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;
- sal = find_pc_line (func_addr, 0);
+ regs[E_A0_REGNUM + aN] = regs[E_SP_REGNUM];
- if (sal.line != 0 && sal.end < func_end)
- return sal.end;
+ 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))
+ {
+ int aN = instr[0] & 0x03;
+ int aM = (instr[0] & 0x0c) >> 2;
+
+ 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;
+
+ regs[E_D0_REGNUM + dN] = regs[E_D0_REGNUM + dM];
+
+ pc += 1;
+ }
+ /* mov aM, dN */
+ else if (instr[0] == 0xf1 && (instr[1] & 0xf0) == 0xd0)
+ {
+ int dN = instr[1] & 0x03;
+ int aM = (instr[1] & 0x0c) >> 2;
+
+ 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;
+
+ regs[E_A0_REGNUM + aN] = regs[E_D0_REGNUM + dM];
+
+ pc += 2;
+ }
+ /* add imm8, SP */
+ else if (instr[0] == 0xf8 && instr[1] == 0xfe)
+ {
+ 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;
+
+ 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)
+ {
+ 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;
+
+ 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)
+ {
+ 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;
+ }
+ /* add imm32, aN */
+ else if (instr[0] == 0xfc && (instr[1] & 0xfc) == 0xd0)
+ {
+ int aN;
+ LONGEST imm32;
+ gdb_byte buf[4];
+
+ aN = instr[1] & 0x03;
+
+ status = target_read_memory (pc + 2, buf, 4);
+ if (status != 0)
+ break;
+
+ 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)
+ {
+ 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;
+
+ 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];
+
+ Y = (instr[1] & 0x02) >> 1;
+
+ status = target_read_memory (pc + 2, buf, 1);
+ if (status != 0)
+ break;
+
+ sM = (buf[0] & 0xf0) >> 4;
+ fsM = (Y << 4) | sM;
+
+ stack.store (regs[E_SP_REGNUM], 4,
+ regs[E_FS0_REGNUM + fsM]);
+
+ pc += 3;
+ }
+ /* fmov fsM, (rN, rI) */
+ else if (instr[0] == 0xfb && instr[1] == 0x37)
+ {
+ int fsM, sM, Z, rN, rI;
+ gdb_byte buf[2];
+
+
+ status = target_read_memory (pc + 2, buf, 2);
+ if (status != 0)
+ break;
+
+ 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]);
+
+ 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];
+
+ 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;
+ d8 = extract_signed_integer (&buf[1], 1, byte_order);
+
+ stack.store (pv_add_constant (regs[translate_rreg (rN)], d8),
+ 4, regs[E_FS0_REGNUM + fsM]);
+
+ 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];
+
+ 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;
+ 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
- /* Either there's no line info, or the line after the prologue is after
- the end of the function. In this case, there probably isn't a
- prologue. */
- return pc;
+ {
+ /* We've hit some instruction that we don't recognize. Hopefully,
+ we have enough to do prologue analysis. */
+ break;
+ }
}
-/* We can't find the start of this function, so there's nothing we can do. */
- return pc;
+ /* 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))
+ {
+ 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: pop_frame
- This routine gets called when either the user uses the `return'
- command, or the call dummy breakpoint gets hit. */
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
-void
-mn10300_pop_frame (frame)
- struct frame_info *frame;
+static CORE_ADDR
+mn10300_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- int regnum;
+ const char *name;
+ CORE_ADDR func_addr, func_end;
+ struct mn10300_prologue p;
-/* printf("mn10300_pop_frame start\n"); */
+ /* Try to find the extent of the function that contains PC. */
+ if (!find_pc_partial_function (pc, &name, &func_addr, &func_end))
+ return pc;
- if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
- generic_pop_dummy_frame ();
- else
+ mn10300_analyze_prologue (gdbarch, pc, func_end, &p);
+ return p.prologue_end;
+}
+
+/* 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)
+{
+ if (!*this_prologue_cache)
{
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+ CORE_ADDR func_start, stop_addr;
+
+ *this_prologue_cache = FRAME_OBSTACK_ZALLOC (struct mn10300_prologue);
+
+ func_start = get_frame_func (this_frame);
+ stop_addr = get_frame_pc (this_frame);
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->fsr.regs[regnum] != 0)
- write_register (regnum,
- read_memory_unsigned_integer (frame->fsr.regs[regnum],
- REGISTER_RAW_SIZE(regnum)));
+ /* 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;
- write_register (SP_REGNUM, FRAME_FP (frame));
+ mn10300_analyze_prologue (get_frame_arch (this_frame),
+ func_start, stop_addr,
+ ((struct mn10300_prologue *)
+ *this_prologue_cache));
}
- flush_cached_frames ();
+ 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
+ {
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ return sp - p->frame_size;
+ }
+}
+
+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));
-/* printf("mn10300_pop_frame end\n"); */
}
-/* 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;
+static struct value *
+mn10300_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
- int argnum = 0;
- int len = 0;
- int stack_offset = 0; /* copy args to this offset onto stack */
+ 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);
+}
-/* printf("mn10300_push_arguments start\n"); */
+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
+};
- /* First, just for safety, make sure stack is aligned */
+static void
+mn10300_frame_unwind_init (struct gdbarch *gdbarch)
+{
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &mn10300_frame_unwind);
+}
+
+/* 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)
+{
+ 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 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. */
sp &= ~3;
- /* Now make space on the stack for the args. */
- for (argnum = 0; argnum < nargs; argnum++)
- len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
+ /* Now make space on the stack for the args.
+ XXX This doesn't appear to handle pass-by-invisible reference
+ arguments. */
+ regs_used = (return_method == return_method_struct) ? 1 : 0;
+ for (len = 0, argnum = 0; argnum < nargs; argnum++)
+ {
+ arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
+ while (regs_used < 2 && arg_len > 0)
+ {
+ regs_used++;
+ arg_len -= push_size;
+ }
+ len += arg_len;
+ }
+
+ /* Allocate stack space. */
sp -= len;
- /* 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;
- 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)
{
- /* for now, pretend structs aren't special */
- 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 (len > 0)
+ while (regs_used < 2 && arg_len > 0)
{
- write_memory (sp + stack_offset, val, 4);
+ regcache_cooked_write_unsigned (regcache, regs_used,
+ extract_unsigned_integer (val, push_size, byte_order));
+ val += push_size;
+ arg_len -= push_size;
+ regs_used++;
+ }
- len -= 4;
- val += 4;
- stack_offset += 4;
+ while (arg_len > 0)
+ {
+ write_memory (sp + stack_offset, val, push_size);
+ arg_len -= push_size;
+ val += push_size;
+ stack_offset += push_size;
}
+
args++;
}
-/* printf"mn10300_push_arguments end\n"); */
+ /* Make space for the flushback area. */
+ sp -= 8;
+
+ /* 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));
+ }
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;
+/* 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)
{
-/* printf("mn10300_push_return_address\n"); */
+ /* 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,
- /* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
- 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;
-{
-/* printf("mn10300_frame_saved_pc\n"); */
+ E_E0_REGNUM, E_E1_REGNUM, E_E2_REGNUM, E_E3_REGNUM,
+ E_E4_REGNUM, E_E5_REGNUM, E_E6_REGNUM, E_E7_REGNUM,
- return (read_memory_integer(fi->frame - REGISTER_SIZE, REGISTER_SIZE));
+ 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,
+
+ 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,
+
+ 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,
+
+ E_MDR_REGNUM, E_PSW_REGNUM, E_PC_REGNUM
+ };
+
+ if (dwarf2 < 0
+ || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
+ return -1;
+
+ return dwarf2_to_gdb[dwarf2];
}
-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;
+static struct gdbarch *
+mn10300_gdbarch_init (struct gdbarch_info info,
+ struct gdbarch_list *arches)
{
-/* printf("get_saved_register\n"); */
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep;
+ int num_regs;
- generic_get_saved_register (raw_buffer, optimized, addrp,
- frame, regnum, lval);
-}
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
-/* 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 frame_chain().
+ tdep = XCNEW (struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
- 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 (since that is derived from v850_frame_chain ()).
+ switch (info.bfd_arch_info->mach)
+ {
+ 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;
+ }
- 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).
-*/
+ /* By default, chars are unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
-void
-mn10300_init_extra_frame_info (fi)
- struct frame_info *fi;
-{
- struct prologue_info pi;
- struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
- int reg;
+ /* 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);
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
+ /* 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? */
- memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+ /* 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) */
- /* The call dummy doesn't save any registers on the stack, so we can return
- now. */
-/*
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return;
- pi.pifsrs = pifsrs;
-*/
+ mn10300_frame_unwind_init (gdbarch);
- /* v850_scan_prologue (fi->pc, &pi); */
-/*
- if (!fi->next && pi.framereg == SP_REGNUM)
- fi->frame = read_register (pi.framereg) - pi.frameoffset;
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
- for (pifsr = pifsrs; pifsr->framereg; pifsr++)
- {
- fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
+ return gdbarch;
+}
+
+/* Dump out the mn10300 specific architecture information. */
- if (pifsr->framereg == SP_REGNUM)
- fi->fsr.regs[pifsr->reg] += pi.frameoffset;
- }
-*/
-/* printf("init_extra_frame_info\n"); */
+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;
+ gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
}