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- /* Target-dependent code for Renesas M32R, for GDB.
- Copyright (C) 1996-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- 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 "frame.h"
- #include "frame-unwind.h"
- #include "frame-base.h"
- #include "symtab.h"
- #include "gdbtypes.h"
- #include "gdbcmd.h"
- #include "gdbcore.h"
- #include "value.h"
- #include "inferior.h"
- #include "symfile.h"
- #include "objfiles.h"
- #include "osabi.h"
- #include "language.h"
- #include "arch-utils.h"
- #include "regcache.h"
- #include "trad-frame.h"
- #include "dis-asm.h"
- #include "m32r-tdep.h"
- #include <algorithm>
- /* The size of the argument registers (r0 - r3) in bytes. */
- #define M32R_ARG_REGISTER_SIZE 4
- /* Local functions */
- static CORE_ADDR
- m32r_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
- {
- /* Align to the size of an instruction (so that they can safely be
- pushed onto the stack. */
- return sp & ~3;
- }
- /* Breakpoints
-
- The little endian mode of M32R is unique. In most of architectures,
- two 16-bit instructions, A and B, are placed as the following:
-
- Big endian:
- A0 A1 B0 B1
-
- Little endian:
- A1 A0 B1 B0
-
- In M32R, they are placed like this:
-
- Big endian:
- A0 A1 B0 B1
-
- Little endian:
- B1 B0 A1 A0
-
- This is because M32R always fetches instructions in 32-bit.
-
- The following functions take care of this behavior. */
- static int
- m32r_memory_insert_breakpoint (struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
- {
- CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address;
- int val;
- gdb_byte buf[4];
- gdb_byte contents_cache[4];
- gdb_byte bp_entry[] = { 0x10, 0xf1 }; /* dpt */
- /* Save the memory contents. */
- val = target_read_memory (addr & 0xfffffffc, contents_cache, 4);
- if (val != 0)
- return val; /* return error */
- memcpy (bp_tgt->shadow_contents, contents_cache, 4);
- bp_tgt->shadow_len = 4;
- /* Determine appropriate breakpoint contents and size for this address. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- {
- if ((addr & 3) == 0)
- {
- buf[0] = bp_entry[0];
- buf[1] = bp_entry[1];
- buf[2] = contents_cache[2] & 0x7f;
- buf[3] = contents_cache[3];
- }
- else
- {
- buf[0] = contents_cache[0];
- buf[1] = contents_cache[1];
- buf[2] = bp_entry[0];
- buf[3] = bp_entry[1];
- }
- }
- else /* little-endian */
- {
- if ((addr & 3) == 0)
- {
- buf[0] = contents_cache[0];
- buf[1] = contents_cache[1] & 0x7f;
- buf[2] = bp_entry[1];
- buf[3] = bp_entry[0];
- }
- else
- {
- buf[0] = bp_entry[1];
- buf[1] = bp_entry[0];
- buf[2] = contents_cache[2];
- buf[3] = contents_cache[3];
- }
- }
- /* Write the breakpoint. */
- val = target_write_memory (addr & 0xfffffffc, buf, 4);
- return val;
- }
- static int
- m32r_memory_remove_breakpoint (struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
- {
- CORE_ADDR addr = bp_tgt->placed_address;
- int val;
- gdb_byte buf[4];
- gdb_byte *contents_cache = bp_tgt->shadow_contents;
- buf[0] = contents_cache[0];
- buf[1] = contents_cache[1];
- buf[2] = contents_cache[2];
- buf[3] = contents_cache[3];
- /* Remove parallel bit. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- {
- if ((buf[0] & 0x80) == 0 && (buf[2] & 0x80) != 0)
- buf[2] &= 0x7f;
- }
- else /* little-endian */
- {
- if ((buf[3] & 0x80) == 0 && (buf[1] & 0x80) != 0)
- buf[1] &= 0x7f;
- }
- /* Write contents. */
- val = target_write_raw_memory (addr & 0xfffffffc, buf, 4);
- return val;
- }
- /* Implement the breakpoint_kind_from_pc gdbarch method. */
- static int
- m32r_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
- {
- if ((*pcptr & 3) == 0)
- return 4;
- else
- return 2;
- }
- /* Implement the sw_breakpoint_from_kind gdbarch method. */
- static const gdb_byte *
- m32r_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
- {
- static gdb_byte be_bp_entry[] = {
- 0x10, 0xf1, 0x70, 0x00
- }; /* dpt -> nop */
- static gdb_byte le_bp_entry[] = {
- 0x00, 0x70, 0xf1, 0x10
- }; /* dpt -> nop */
- *size = kind;
- /* Determine appropriate breakpoint. */
- if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
- return be_bp_entry;
- else
- {
- if (kind == 4)
- return le_bp_entry;
- else
- return le_bp_entry + 2;
- }
- }
- static const char * const m32r_register_names[] = {
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "fp", "lr", "sp",
- "psw", "cbr", "spi", "spu", "bpc", "pc", "accl", "acch",
- "evb"
- };
- static const char *
- m32r_register_name (struct gdbarch *gdbarch, int reg_nr)
- {
- if (reg_nr < 0)
- return NULL;
- if (reg_nr >= M32R_NUM_REGS)
- return NULL;
- return m32r_register_names[reg_nr];
- }
- /* Return the GDB type object for the "standard" data type
- of data in register N. */
- static struct type *
- m32r_register_type (struct gdbarch *gdbarch, int reg_nr)
- {
- if (reg_nr == M32R_PC_REGNUM)
- return builtin_type (gdbarch)->builtin_func_ptr;
- else if (reg_nr == M32R_SP_REGNUM || reg_nr == M32R_FP_REGNUM)
- return builtin_type (gdbarch)->builtin_data_ptr;
- else
- return builtin_type (gdbarch)->builtin_int32;
- }
- /* Write into appropriate registers a function return value
- of type TYPE, given in virtual format.
- Things always get returned in RET1_REGNUM, RET2_REGNUM. */
- static void
- m32r_store_return_value (struct type *type, struct regcache *regcache,
- const gdb_byte *valbuf)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR regval;
- int len = TYPE_LENGTH (type);
- regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len, byte_order);
- regcache_cooked_write_unsigned (regcache, RET1_REGNUM, regval);
- if (len > 4)
- {
- regval = extract_unsigned_integer (valbuf + 4,
- len - 4, byte_order);
- regcache_cooked_write_unsigned (regcache, RET1_REGNUM + 1, regval);
- }
- }
- /* This is required by skip_prologue. The results of decoding a prologue
- should be cached because this thrashing is getting nuts. */
- static int
- decode_prologue (struct gdbarch *gdbarch,
- CORE_ADDR start_pc, CORE_ADDR scan_limit,
- CORE_ADDR *pl_endptr, unsigned long *framelength)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- unsigned long framesize;
- int insn;
- int op1;
- CORE_ADDR after_prologue = 0;
- CORE_ADDR after_push = 0;
- CORE_ADDR after_stack_adjust = 0;
- CORE_ADDR current_pc;
- LONGEST return_value;
- framesize = 0;
- after_prologue = 0;
- for (current_pc = start_pc; current_pc < scan_limit; current_pc += 2)
- {
- /* Check if current pc's location is readable. */
- if (!safe_read_memory_integer (current_pc, 2, byte_order, &return_value))
- return -1;
- insn = read_memory_unsigned_integer (current_pc, 2, byte_order);
- if (insn == 0x0000)
- break;
- /* If this is a 32 bit instruction, we dont want to examine its
- immediate data as though it were an instruction. */
- if (current_pc & 0x02)
- {
- /* Decode this instruction further. */
- insn &= 0x7fff;
- }
- else
- {
- if (insn & 0x8000)
- {
- if (current_pc == scan_limit)
- scan_limit += 2; /* extend the search */
- current_pc += 2; /* skip the immediate data */
- /* Check if current pc's location is readable. */
- if (!safe_read_memory_integer (current_pc, 2, byte_order,
- &return_value))
- return -1;
- if (insn == 0x8faf) /* add3 sp, sp, xxxx */
- /* add 16 bit sign-extended offset */
- {
- framesize +=
- -((short) read_memory_unsigned_integer (current_pc,
- 2, byte_order));
- }
- else
- {
- if (((insn >> 8) == 0xe4) /* ld24 r4, xxxxxx; sub sp, r4 */
- && safe_read_memory_integer (current_pc + 2,
- 2, byte_order,
- &return_value)
- && read_memory_unsigned_integer (current_pc + 2,
- 2, byte_order)
- == 0x0f24)
- {
- /* Subtract 24 bit sign-extended negative-offset. */
- insn = read_memory_unsigned_integer (current_pc - 2,
- 4, byte_order);
- if (insn & 0x00800000) /* sign extend */
- insn |= 0xff000000; /* negative */
- else
- insn &= 0x00ffffff; /* positive */
- framesize += insn;
- }
- }
- after_push = current_pc + 2;
- continue;
- }
- }
- op1 = insn & 0xf000; /* Isolate just the first nibble. */
- if ((insn & 0xf0ff) == 0x207f)
- { /* st reg, @-sp */
- framesize += 4;
- after_prologue = 0;
- continue;
- }
- if ((insn >> 8) == 0x4f) /* addi sp, xx */
- /* Add 8 bit sign-extended offset. */
- {
- int stack_adjust = (signed char) (insn & 0xff);
- /* there are probably two of these stack adjustments:
- 1) A negative one in the prologue, and
- 2) A positive one in the epilogue.
- We are only interested in the first one. */
- if (stack_adjust < 0)
- {
- framesize -= stack_adjust;
- after_prologue = 0;
- /* A frameless function may have no "mv fp, sp".
- In that case, this is the end of the prologue. */
- after_stack_adjust = current_pc + 2;
- }
- continue;
- }
- if (insn == 0x1d8f)
- { /* mv fp, sp */
- after_prologue = current_pc + 2;
- break; /* end of stack adjustments */
- }
- /* Nop looks like a branch, continue explicitly. */
- if (insn == 0x7000)
- {
- after_prologue = current_pc + 2;
- continue; /* nop occurs between pushes. */
- }
- /* End of prolog if any of these are trap instructions. */
- if ((insn & 0xfff0) == 0x10f0)
- {
- after_prologue = current_pc;
- break;
- }
- /* End of prolog if any of these are branch instructions. */
- if ((op1 == 0x7000) || (op1 == 0xb000) || (op1 == 0xf000))
- {
- after_prologue = current_pc;
- continue;
- }
- /* Some of the branch instructions are mixed with other types. */
- if (op1 == 0x1000)
- {
- int subop = insn & 0x0ff0;
- if ((subop == 0x0ec0) || (subop == 0x0fc0))
- {
- after_prologue = current_pc;
- continue; /* jmp , jl */
- }
- }
- }
- if (framelength)
- *framelength = framesize;
- if (current_pc >= scan_limit)
- {
- if (pl_endptr)
- {
- if (after_stack_adjust != 0)
- /* We did not find a "mv fp,sp", but we DID find
- a stack_adjust. Is it safe to use that as the
- end of the prologue? I just don't know. */
- {
- *pl_endptr = after_stack_adjust;
- }
- else if (after_push != 0)
- /* We did not find a "mv fp,sp", but we DID find
- a push. Is it safe to use that as the
- end of the prologue? I just don't know. */
- {
- *pl_endptr = after_push;
- }
- else
- /* We reached the end of the loop without finding the end
- of the prologue. No way to win -- we should report
- failure. The way we do that is to return the original
- start_pc. GDB will set a breakpoint at the start of
- the function (etc.) */
- *pl_endptr = start_pc;
- }
- return 0;
- }
- if (after_prologue == 0)
- after_prologue = current_pc;
- if (pl_endptr)
- *pl_endptr = after_prologue;
- return 0;
- } /* decode_prologue */
- /* Function: skip_prologue
- Find end of function prologue. */
- #define DEFAULT_SEARCH_LIMIT 128
- static CORE_ADDR
- m32r_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR func_addr, func_end;
- struct symtab_and_line sal;
- LONGEST return_value;
- /* See what the symbol table says. */
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- {
- sal = find_pc_line (func_addr, 0);
- if (sal.line != 0 && sal.end <= func_end)
- {
- func_end = sal.end;
- }
- 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. */
- {
- func_end = std::min (func_end, func_addr + DEFAULT_SEARCH_LIMIT);
- }
- }
- else
- func_end = pc + DEFAULT_SEARCH_LIMIT;
- /* If pc's location is not readable, just quit. */
- if (!safe_read_memory_integer (pc, 4, byte_order, &return_value))
- return pc;
- /* Find the end of prologue. */
- if (decode_prologue (gdbarch, pc, func_end, &sal.end, NULL) < 0)
- return pc;
- return sal.end;
- }
- struct m32r_unwind_cache
- {
- /* The previous frame's inner most stack address. Used as this
- frame ID's stack_addr. */
- CORE_ADDR prev_sp;
- /* The frame's base, optionally used by the high-level debug info. */
- CORE_ADDR base;
- int size;
- /* How far the SP and r13 (FP) have been offset from the start of
- the stack frame (as defined by the previous frame's stack
- pointer). */
- LONGEST sp_offset;
- LONGEST r13_offset;
- int uses_frame;
- /* Table indicating the location of each and every register. */
- trad_frame_saved_reg *saved_regs;
- };
- /* Put here the code to store, into fi->saved_regs, the addresses of
- the saved registers of frame described by FRAME_INFO. This
- includes special registers such as pc and fp saved in special ways
- in the stack frame. sp is even more special: the address we return
- for it IS the sp for the next frame. */
- static struct m32r_unwind_cache *
- m32r_frame_unwind_cache (struct frame_info *this_frame,
- void **this_prologue_cache)
- {
- CORE_ADDR pc, scan_limit;
- ULONGEST prev_sp;
- ULONGEST this_base;
- unsigned long op;
- int i;
- struct m32r_unwind_cache *info;
- if ((*this_prologue_cache))
- return (struct m32r_unwind_cache *) (*this_prologue_cache);
- info = FRAME_OBSTACK_ZALLOC (struct m32r_unwind_cache);
- (*this_prologue_cache) = info;
- info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- info->size = 0;
- info->sp_offset = 0;
- info->uses_frame = 0;
- scan_limit = get_frame_pc (this_frame);
- for (pc = get_frame_func (this_frame);
- pc > 0 && pc < scan_limit; pc += 2)
- {
- if ((pc & 2) == 0)
- {
- op = get_frame_memory_unsigned (this_frame, pc, 4);
- if ((op & 0x80000000) == 0x80000000)
- {
- /* 32-bit instruction */
- if ((op & 0xffff0000) == 0x8faf0000)
- {
- /* add3 sp,sp,xxxx */
- short n = op & 0xffff;
- info->sp_offset += n;
- }
- else if (((op >> 8) == 0xe4)
- && get_frame_memory_unsigned (this_frame, pc + 2,
- 2) == 0x0f24)
- {
- /* ld24 r4, xxxxxx; sub sp, r4 */
- unsigned long n = op & 0xffffff;
- info->sp_offset += n;
- pc += 2; /* skip sub instruction */
- }
- if (pc == scan_limit)
- scan_limit += 2; /* extend the search */
- pc += 2; /* skip the immediate data */
- continue;
- }
- }
- /* 16-bit instructions */
- op = get_frame_memory_unsigned (this_frame, pc, 2) & 0x7fff;
- if ((op & 0xf0ff) == 0x207f)
- {
- /* st rn, @-sp */
- int regno = ((op >> 8) & 0xf);
- info->sp_offset -= 4;
- info->saved_regs[regno].set_addr (info->sp_offset);
- }
- else if ((op & 0xff00) == 0x4f00)
- {
- /* addi sp, xx */
- int n = (signed char) (op & 0xff);
- info->sp_offset += n;
- }
- else if (op == 0x1d8f)
- {
- /* mv fp, sp */
- info->uses_frame = 1;
- info->r13_offset = info->sp_offset;
- break; /* end of stack adjustments */
- }
- else if ((op & 0xfff0) == 0x10f0)
- {
- /* End of prologue if this is a trap instruction. */
- break; /* End of stack adjustments. */
- }
- }
- info->size = -info->sp_offset;
- /* Compute the previous frame's stack pointer (which is also the
- frame's ID's stack address), and this frame's base pointer. */
- if (info->uses_frame)
- {
- /* The SP was moved to the FP. This indicates that a new frame
- was created. Get THIS frame's FP value by unwinding it from
- the next frame. */
- this_base = get_frame_register_unsigned (this_frame, M32R_FP_REGNUM);
- /* The FP points at the last saved register. Adjust the FP back
- to before the first saved register giving the SP. */
- prev_sp = this_base + info->size;
- }
- else
- {
- /* Assume that the FP is this frame's SP but with that pushed
- stack space added back. */
- this_base = get_frame_register_unsigned (this_frame, M32R_SP_REGNUM);
- prev_sp = this_base + info->size;
- }
- /* Convert that SP/BASE into real addresses. */
- info->prev_sp = prev_sp;
- info->base = this_base;
- /* Adjust all the saved registers so that they contain addresses and
- not offsets. */
- for (i = 0; i < gdbarch_num_regs (get_frame_arch (this_frame)) - 1; i++)
- if (info->saved_regs[i].is_addr ())
- info->saved_regs[i].set_addr (info->prev_sp
- + info->saved_regs[i].addr ());
- /* The call instruction moves the caller's PC in the callee's LR.
- Since this is an unwind, do the reverse. Copy the location of LR
- into PC (the address / regnum) so that a request for PC will be
- converted into a request for the LR. */
- info->saved_regs[M32R_PC_REGNUM] = info->saved_regs[LR_REGNUM];
- /* The previous frame's SP needed to be computed. Save the computed
- value. */
- info->saved_regs[M32R_SP_REGNUM].set_value (prev_sp);
- return info;
- }
- static CORE_ADDR
- m32r_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- 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);
- int stack_offset, stack_alloc;
- int argreg = ARG1_REGNUM;
- int argnum;
- struct type *type;
- enum type_code typecode;
- CORE_ADDR regval;
- gdb_byte *val;
- gdb_byte valbuf[M32R_ARG_REGISTER_SIZE];
- int len;
- /* First force sp to a 4-byte alignment. */
- sp = sp & ~3;
- /* Set the return address. For the m32r, the return breakpoint is
- always at BP_ADDR. */
- regcache_cooked_write_unsigned (regcache, LR_REGNUM, bp_addr);
- /* If STRUCT_RETURN is true, then the struct return address (in
- STRUCT_ADDR) will consume the first argument-passing register.
- Both adjust the register count and store that value. */
- if (return_method == return_method_struct)
- {
- regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
- argreg++;
- }
- /* Now make sure there's space on the stack. */
- for (argnum = 0, stack_alloc = 0; argnum < nargs; argnum++)
- stack_alloc += ((TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3);
- sp -= stack_alloc; /* Make room on stack for args. */
- for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
- {
- type = value_type (args[argnum]);
- typecode = type->code ();
- len = TYPE_LENGTH (type);
- memset (valbuf, 0, sizeof (valbuf));
- /* Passes structures that do not fit in 2 registers by reference. */
- if (len > 8
- && (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION))
- {
- store_unsigned_integer (valbuf, 4, byte_order,
- value_address (args[argnum]));
- typecode = TYPE_CODE_PTR;
- len = 4;
- val = valbuf;
- }
- else if (len < 4)
- {
- /* Value gets right-justified in the register or stack word. */
- memcpy (valbuf + (register_size (gdbarch, argreg) - len),
- (gdb_byte *) value_contents (args[argnum]).data (), len);
- val = valbuf;
- }
- else
- val = (gdb_byte *) value_contents (args[argnum]).data ();
- while (len > 0)
- {
- if (argreg > ARGN_REGNUM)
- {
- /* Must go on the stack. */
- write_memory (sp + stack_offset, val, 4);
- stack_offset += 4;
- }
- else if (argreg <= ARGN_REGNUM)
- {
- /* There's room in a register. */
- regval =
- extract_unsigned_integer (val,
- register_size (gdbarch, argreg),
- byte_order);
- regcache_cooked_write_unsigned (regcache, argreg++, regval);
- }
- /* Store the value 4 bytes at a time. This means that things
- larger than 4 bytes may go partly in registers and partly
- on the stack. */
- len -= register_size (gdbarch, argreg);
- val += register_size (gdbarch, argreg);
- }
- }
- /* Finally, update the SP register. */
- regcache_cooked_write_unsigned (regcache, M32R_SP_REGNUM, sp);
- return sp;
- }
- /* Given a return value in `regbuf' with a type `valtype',
- extract and copy its value into `valbuf'. */
- static void
- m32r_extract_return_value (struct type *type, struct regcache *regcache,
- gdb_byte *dst)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int len = TYPE_LENGTH (type);
- ULONGEST tmp;
- /* By using store_unsigned_integer we avoid having to do
- anything special for small big-endian values. */
- regcache_cooked_read_unsigned (regcache, RET1_REGNUM, &tmp);
- store_unsigned_integer (dst, (len > 4 ? len - 4 : len), byte_order, tmp);
- /* Ignore return values more than 8 bytes in size because the m32r
- returns anything more than 8 bytes in the stack. */
- if (len > 4)
- {
- regcache_cooked_read_unsigned (regcache, RET1_REGNUM + 1, &tmp);
- store_unsigned_integer (dst + len - 4, 4, byte_order, tmp);
- }
- }
- static enum return_value_convention
- m32r_return_value (struct gdbarch *gdbarch, struct value *function,
- struct type *valtype, struct regcache *regcache,
- gdb_byte *readbuf, const gdb_byte *writebuf)
- {
- if (TYPE_LENGTH (valtype) > 8)
- return RETURN_VALUE_STRUCT_CONVENTION;
- else
- {
- if (readbuf != NULL)
- m32r_extract_return_value (valtype, regcache, readbuf);
- if (writebuf != NULL)
- m32r_store_return_value (valtype, regcache, writebuf);
- return RETURN_VALUE_REGISTER_CONVENTION;
- }
- }
- /* Given a GDB frame, determine the address of the calling function's
- frame. This will be used to create a new GDB frame struct. */
- static void
- m32r_frame_this_id (struct frame_info *this_frame,
- void **this_prologue_cache, struct frame_id *this_id)
- {
- struct m32r_unwind_cache *info
- = m32r_frame_unwind_cache (this_frame, this_prologue_cache);
- CORE_ADDR base;
- CORE_ADDR func;
- struct bound_minimal_symbol msym_stack;
- struct frame_id id;
- /* The FUNC is easy. */
- func = get_frame_func (this_frame);
- /* Check if the stack is empty. */
- msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL);
- if (msym_stack.minsym && info->base == BMSYMBOL_VALUE_ADDRESS (msym_stack))
- return;
- /* Hopefully the prologue analysis either correctly determined the
- frame's base (which is the SP from the previous frame), or set
- that base to "NULL". */
- base = info->prev_sp;
- if (base == 0)
- return;
- id = frame_id_build (base, func);
- (*this_id) = id;
- }
- static struct value *
- m32r_frame_prev_register (struct frame_info *this_frame,
- void **this_prologue_cache, int regnum)
- {
- struct m32r_unwind_cache *info
- = m32r_frame_unwind_cache (this_frame, this_prologue_cache);
- return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
- }
- static const struct frame_unwind m32r_frame_unwind = {
- "m32r prologue",
- NORMAL_FRAME,
- default_frame_unwind_stop_reason,
- m32r_frame_this_id,
- m32r_frame_prev_register,
- NULL,
- default_frame_sniffer
- };
- static CORE_ADDR
- m32r_frame_base_address (struct frame_info *this_frame, void **this_cache)
- {
- struct m32r_unwind_cache *info
- = m32r_frame_unwind_cache (this_frame, this_cache);
- return info->base;
- }
- static const struct frame_base m32r_frame_base = {
- &m32r_frame_unwind,
- m32r_frame_base_address,
- m32r_frame_base_address,
- m32r_frame_base_address
- };
- static gdbarch_init_ftype m32r_gdbarch_init;
- static struct gdbarch *
- m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
- {
- struct gdbarch *gdbarch;
- /* If there is already a candidate, use it. */
- arches = gdbarch_list_lookup_by_info (arches, &info);
- if (arches != NULL)
- return arches->gdbarch;
- /* Allocate space for the new architecture. */
- m32r_gdbarch_tdep *tdep = new m32r_gdbarch_tdep;
- gdbarch = gdbarch_alloc (&info, tdep);
- set_gdbarch_wchar_bit (gdbarch, 16);
- set_gdbarch_wchar_signed (gdbarch, 0);
- set_gdbarch_num_regs (gdbarch, M32R_NUM_REGS);
- set_gdbarch_pc_regnum (gdbarch, M32R_PC_REGNUM);
- set_gdbarch_sp_regnum (gdbarch, M32R_SP_REGNUM);
- set_gdbarch_register_name (gdbarch, m32r_register_name);
- set_gdbarch_register_type (gdbarch, m32r_register_type);
- set_gdbarch_push_dummy_call (gdbarch, m32r_push_dummy_call);
- set_gdbarch_return_value (gdbarch, m32r_return_value);
- set_gdbarch_skip_prologue (gdbarch, m32r_skip_prologue);
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_breakpoint_kind_from_pc (gdbarch, m32r_breakpoint_kind_from_pc);
- set_gdbarch_sw_breakpoint_from_kind (gdbarch, m32r_sw_breakpoint_from_kind);
- set_gdbarch_memory_insert_breakpoint (gdbarch,
- m32r_memory_insert_breakpoint);
- set_gdbarch_memory_remove_breakpoint (gdbarch,
- m32r_memory_remove_breakpoint);
- set_gdbarch_frame_align (gdbarch, m32r_frame_align);
- frame_base_set_default (gdbarch, &m32r_frame_base);
- /* Hook in ABI-specific overrides, if they have been registered. */
- gdbarch_init_osabi (info, gdbarch);
- /* Hook in the default unwinders. */
- frame_unwind_append_unwinder (gdbarch, &m32r_frame_unwind);
- /* Support simple overlay manager. */
- set_gdbarch_overlay_update (gdbarch, simple_overlay_update);
- return gdbarch;
- }
- void _initialize_m32r_tdep ();
- void
- _initialize_m32r_tdep ()
- {
- register_gdbarch_init (bfd_arch_m32r, m32r_gdbarch_init);
- }
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