+++ /dev/null
-/* Target-dependent code for the Motorola 88000 series.
-
- Copyright (C) 2004-2018 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 "arch-utils.h"
-#include "dis-asm.h"
-#include "frame.h"
-#include "frame-base.h"
-#include "frame-unwind.h"
-#include "gdbcore.h"
-#include "gdbtypes.h"
-#include "regcache.h"
-#include "regset.h"
-#include "symtab.h"
-#include "trad-frame.h"
-#include "value.h"
-#include <algorithm>
-
-#include "m88k-tdep.h"
-
-/* Fetch the instruction at PC. */
-
-static unsigned long
-m88k_fetch_instruction (CORE_ADDR pc, enum bfd_endian byte_order)
-{
- return read_memory_unsigned_integer (pc, 4, byte_order);
-}
-
-/* Register information. */
-
-/* Return the name of register REGNUM. */
-
-static const char *
-m88k_register_name (struct gdbarch *gdbarch, int regnum)
-{
- static const char *register_names[] =
- {
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
- "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
- "epsr", "fpsr", "fpcr", "sxip", "snip", "sfip"
- };
-
- if (regnum >= 0 && regnum < ARRAY_SIZE (register_names))
- return register_names[regnum];
-
- return NULL;
-}
-
-/* Return the GDB type object for the "standard" data type of data in
- register REGNUM. */
-
-static struct type *
-m88k_register_type (struct gdbarch *gdbarch, int regnum)
-{
- /* SXIP, SNIP, SFIP and R1 contain code addresses. */
- if ((regnum >= M88K_SXIP_REGNUM && regnum <= M88K_SFIP_REGNUM)
- || regnum == M88K_R1_REGNUM)
- return builtin_type (gdbarch)->builtin_func_ptr;
-
- /* R30 and R31 typically contains data addresses. */
- if (regnum == M88K_R30_REGNUM || regnum == M88K_R31_REGNUM)
- return builtin_type (gdbarch)->builtin_data_ptr;
-
- return builtin_type (gdbarch)->builtin_int32;
-}
-\f
-
-static CORE_ADDR
-m88k_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
-{
- /* All instructures are 4-byte aligned. The lower 2 bits of SXIP,
- SNIP and SFIP are used for special purposes: bit 0 is the
- exception bit and bit 1 is the valid bit. */
- return addr & ~0x3;
-}
-
-/* Use the program counter to determine the contents and size of a
- breakpoint instruction. Return a pointer to a string of bytes that
- encode a breakpoint instruction, store the length of the string in
- *LEN and optionally adjust *PC to point to the correct memory
- location for inserting the breakpoint. */
-
-/* tb 0,r0,511 */
-constexpr gdb_byte m88k_break_insn[] = { 0xf0, 0x00, 0xd1, 0xff };
-
-typedef BP_MANIPULATION (m88k_break_insn) m88k_breakpoint;
-
-static CORE_ADDR
-m88k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
-{
- CORE_ADDR pc;
-
- pc = frame_unwind_register_unsigned (next_frame, M88K_SXIP_REGNUM);
- return m88k_addr_bits_remove (gdbarch, pc);
-}
-
-static void
-m88k_write_pc (struct regcache *regcache, CORE_ADDR pc)
-{
- /* According to the MC88100 RISC Microprocessor User's Manual,
- section 6.4.3.1.2:
-
- "... can be made to return to a particular instruction by placing
- a valid instruction address in the SNIP and the next sequential
- instruction address in the SFIP (with V bits set and E bits
- clear). The rte resumes execution at the instruction pointed to
- by the SNIP, then the SFIP."
-
- The E bit is the least significant bit (bit 0). The V (valid)
- bit is bit 1. This is why we logical or 2 into the values we are
- writing below. It turns out that SXIP plays no role when
- returning from an exception so nothing special has to be done
- with it. We could even (presumably) give it a totally bogus
- value. */
-
- regcache_cooked_write_unsigned (regcache, M88K_SXIP_REGNUM, pc);
- regcache_cooked_write_unsigned (regcache, M88K_SNIP_REGNUM, pc | 2);
- regcache_cooked_write_unsigned (regcache, M88K_SFIP_REGNUM, (pc + 4) | 2);
-}
-\f
-
-/* The functions on this page are intended to be used to classify
- function arguments. */
-
-/* Check whether TYPE is "Integral or Pointer". */
-
-static int
-m88k_integral_or_pointer_p (const struct type *type)
-{
- switch (TYPE_CODE (type))
- {
- case TYPE_CODE_INT:
- case TYPE_CODE_BOOL:
- case TYPE_CODE_CHAR:
- case TYPE_CODE_ENUM:
- case TYPE_CODE_RANGE:
- {
- /* We have byte, half-word, word and extended-word/doubleword
- integral types. */
- int len = TYPE_LENGTH (type);
- return (len == 1 || len == 2 || len == 4 || len == 8);
- }
- return 1;
- case TYPE_CODE_PTR:
- case TYPE_CODE_REF:
- case TYPE_CODE_RVALUE_REF:
- {
- /* Allow only 32-bit pointers. */
- return (TYPE_LENGTH (type) == 4);
- }
- return 1;
- default:
- break;
- }
-
- return 0;
-}
-
-/* Check whether TYPE is "Floating". */
-
-static int
-m88k_floating_p (const struct type *type)
-{
- switch (TYPE_CODE (type))
- {
- case TYPE_CODE_FLT:
- {
- int len = TYPE_LENGTH (type);
- return (len == 4 || len == 8);
- }
- default:
- break;
- }
-
- return 0;
-}
-
-/* Check whether TYPE is "Structure or Union". */
-
-static int
-m88k_structure_or_union_p (const struct type *type)
-{
- switch (TYPE_CODE (type))
- {
- case TYPE_CODE_STRUCT:
- case TYPE_CODE_UNION:
- return 1;
- default:
- break;
- }
-
- return 0;
-}
-
-/* Check whether TYPE has 8-byte alignment. */
-
-static int
-m88k_8_byte_align_p (struct type *type)
-{
- if (m88k_structure_or_union_p (type))
- {
- int i;
-
- for (i = 0; i < TYPE_NFIELDS (type); i++)
- {
- struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i));
-
- if (m88k_8_byte_align_p (subtype))
- return 1;
- }
- }
-
- if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
- return (TYPE_LENGTH (type) == 8);
-
- return 0;
-}
-
-/* Check whether TYPE can be passed in a register. */
-
-static int
-m88k_in_register_p (struct type *type)
-{
- if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
- return 1;
-
- if (m88k_structure_or_union_p (type) && TYPE_LENGTH (type) == 4)
- return 1;
-
- return 0;
-}
-
-static CORE_ADDR
-m88k_store_arguments (struct regcache *regcache, int nargs,
- struct value **args, CORE_ADDR sp)
-{
- struct gdbarch *gdbarch = regcache->arch ();
- int num_register_words = 0;
- int num_stack_words = 0;
- int i;
-
- for (i = 0; i < nargs; i++)
- {
- struct type *type = value_type (args[i]);
- int len = TYPE_LENGTH (type);
-
- if (m88k_integral_or_pointer_p (type) && len < 4)
- {
- args[i] = value_cast (builtin_type (gdbarch)->builtin_int32,
- args[i]);
- type = value_type (args[i]);
- len = TYPE_LENGTH (type);
- }
-
- if (m88k_in_register_p (type))
- {
- int num_words = 0;
-
- if (num_register_words % 2 == 1 && m88k_8_byte_align_p (type))
- num_words++;
-
- num_words += ((len + 3) / 4);
- if (num_register_words + num_words <= 8)
- {
- num_register_words += num_words;
- continue;
- }
-
- /* We've run out of available registers. Pass the argument
- on the stack. */
- }
-
- if (num_stack_words % 2 == 1 && m88k_8_byte_align_p (type))
- num_stack_words++;
-
- num_stack_words += ((len + 3) / 4);
- }
-
- /* Allocate stack space. */
- sp = align_down (sp - 32 - num_stack_words * 4, 16);
- num_stack_words = num_register_words = 0;
-
- for (i = 0; i < nargs; i++)
- {
- const bfd_byte *valbuf = value_contents (args[i]);
- struct type *type = value_type (args[i]);
- int len = TYPE_LENGTH (type);
- int stack_word = num_stack_words;
-
- if (m88k_in_register_p (type))
- {
- int register_word = num_register_words;
-
- if (register_word % 2 == 1 && m88k_8_byte_align_p (type))
- register_word++;
-
- gdb_assert (len == 4 || len == 8);
-
- if (register_word + len / 8 < 8)
- {
- int regnum = M88K_R2_REGNUM + register_word;
-
- regcache_raw_write (regcache, regnum, valbuf);
- if (len > 4)
- regcache_raw_write (regcache, regnum + 1, valbuf + 4);
-
- num_register_words = (register_word + len / 4);
- continue;
- }
- }
-
- if (stack_word % 2 == -1 && m88k_8_byte_align_p (type))
- stack_word++;
-
- write_memory (sp + stack_word * 4, valbuf, len);
- num_stack_words = (stack_word + (len + 3) / 4);
- }
-
- return sp;
-}
-
-static CORE_ADDR
-m88k_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
- struct value **args, CORE_ADDR sp, int struct_return,
- CORE_ADDR struct_addr)
-{
- /* Set up the function arguments. */
- sp = m88k_store_arguments (regcache, nargs, args, sp);
- gdb_assert (sp % 16 == 0);
-
- /* Store return value address. */
- if (struct_return)
- regcache_raw_write_unsigned (regcache, M88K_R12_REGNUM, struct_addr);
-
- /* Store the stack pointer and return address in the appropriate
- registers. */
- regcache_raw_write_unsigned (regcache, M88K_R31_REGNUM, sp);
- regcache_raw_write_unsigned (regcache, M88K_R1_REGNUM, bp_addr);
-
- /* Return the stack pointer. */
- return sp;
-}
-
-static struct frame_id
-m88k_dummy_id (struct gdbarch *arch, struct frame_info *this_frame)
-{
- CORE_ADDR sp;
-
- sp = get_frame_register_unsigned (this_frame, M88K_R31_REGNUM);
- return frame_id_build (sp, get_frame_pc (this_frame));
-}
-\f
-
-/* 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
-m88k_return_value (struct gdbarch *gdbarch, struct value *function,
- struct type *type, struct regcache *regcache,
- gdb_byte *readbuf, const gdb_byte *writebuf)
-{
- int len = TYPE_LENGTH (type);
- gdb_byte buf[8];
-
- if (!m88k_integral_or_pointer_p (type) && !m88k_floating_p (type))
- return RETURN_VALUE_STRUCT_CONVENTION;
-
- if (readbuf)
- {
- /* Read the contents of R2 and (if necessary) R3. */
- regcache_cooked_read (regcache, M88K_R2_REGNUM, buf);
- if (len > 4)
- {
- regcache_cooked_read (regcache, M88K_R3_REGNUM, buf + 4);
- gdb_assert (len == 8);
- memcpy (readbuf, buf, len);
- }
- else
- {
- /* Just stripping off any unused bytes should preserve the
- signed-ness just fine. */
- memcpy (readbuf, buf + 4 - len, len);
- }
- }
-
- if (writebuf)
- {
- /* Read the contents to R2 and (if necessary) R3. */
- if (len > 4)
- {
- gdb_assert (len == 8);
- memcpy (buf, writebuf, 8);
- regcache_cooked_write (regcache, M88K_R3_REGNUM, buf + 4);
- }
- else
- {
- /* ??? Do we need to do any sign-extension here? */
- memcpy (buf + 4 - len, writebuf, len);
- }
- regcache_cooked_write (regcache, M88K_R2_REGNUM, buf);
- }
-
- return RETURN_VALUE_REGISTER_CONVENTION;
-}
-\f
-/* Default frame unwinder. */
-
-struct m88k_frame_cache
-{
- /* Base address. */
- CORE_ADDR base;
- CORE_ADDR pc;
-
- int sp_offset;
- int fp_offset;
-
- /* Table of saved registers. */
- struct trad_frame_saved_reg *saved_regs;
-};
-
-/* Prologue analysis. */
-
-/* Macros for extracting fields from instructions. */
-
-#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
-#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
-#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
-#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
-#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-
-/* Possible actions to be taken by the prologue analyzer for the
- instructions it encounters. */
-
-enum m88k_prologue_insn_action
-{
- M88K_PIA_SKIP, /* Ignore. */
- M88K_PIA_NOTE_ST, /* Note register store. */
- M88K_PIA_NOTE_STD, /* Note register pair store. */
- M88K_PIA_NOTE_SP_ADJUSTMENT, /* Note stack pointer adjustment. */
- M88K_PIA_NOTE_FP_ASSIGNMENT, /* Note frame pointer assignment. */
- M88K_PIA_NOTE_BRANCH, /* Note branch. */
- M88K_PIA_NOTE_PROLOGUE_END /* Note end of prologue. */
-};
-
-/* Table of instructions that may comprise a function prologue. */
-
-struct m88k_prologue_insn
-{
- unsigned long insn;
- unsigned long mask;
- enum m88k_prologue_insn_action action;
-};
-
-struct m88k_prologue_insn m88k_prologue_insn_table[] =
-{
- /* Various register move instructions. */
- { 0x58000000, 0xf800ffff, M88K_PIA_SKIP }, /* or/or.u with immed of 0 */
- { 0xf4005800, 0xfc1fffe0, M88K_PIA_SKIP }, /* or rd,r0,rs */
- { 0xf4005800, 0xfc00ffff, M88K_PIA_SKIP }, /* or rd,rs,r0 */
-
- /* Various other instructions. */
- { 0x58000000, 0xf8000000, M88K_PIA_SKIP }, /* or/or.u */
-
- /* Stack pointer setup: "subu sp,sp,n" where n is a multiple of 8. */
- { 0x67ff0000, 0xffff0007, M88K_PIA_NOTE_SP_ADJUSTMENT },
-
- /* Frame pointer assignment: "addu r30,r31,n". */
- { 0x63df0000, 0xffff0000, M88K_PIA_NOTE_FP_ASSIGNMENT },
-
- /* Store to stack instructions; either "st rx,sp,n" or "st.d rx,sp,n". */
- { 0x241f0000, 0xfc1f0000, M88K_PIA_NOTE_ST }, /* st rx,sp,n */
- { 0x201f0000, 0xfc1f0000, M88K_PIA_NOTE_STD }, /* st.d rs,sp,n */
-
- /* Instructions needed for setting up r25 for pic code. */
- { 0x5f200000, 0xffff0000, M88K_PIA_SKIP }, /* or.u r25,r0,offset_high */
- { 0xcc000002, 0xffffffff, M88K_PIA_SKIP }, /* bsr.n Lab */
- { 0x5b390000, 0xffff0000, M88K_PIA_SKIP }, /* or r25,r25,offset_low */
- { 0xf7396001, 0xffffffff, M88K_PIA_SKIP }, /* Lab: addu r25,r25,r1 */
-
- /* Various branch or jump instructions which have a delay slot --
- these do not form part of the prologue, but the instruction in
- the delay slot might be a store instruction which should be
- noted. */
- { 0xc4000000, 0xe4000000, M88K_PIA_NOTE_BRANCH },
- /* br.n, bsr.n, bb0.n, or bb1.n */
- { 0xec000000, 0xfc000000, M88K_PIA_NOTE_BRANCH }, /* bcnd.n */
- { 0xf400c400, 0xfffff7e0, M88K_PIA_NOTE_BRANCH }, /* jmp.n or jsr.n */
-
- /* Catch all. Ends prologue analysis. */
- { 0x00000000, 0x00000000, M88K_PIA_NOTE_PROLOGUE_END }
-};
-
-/* Do a full analysis of the function prologue at PC and update CACHE
- accordingly. Bail out early if LIMIT is reached. Return the
- address where the analysis stopped. If LIMIT points beyond the
- function prologue, the return address should be the end of the
- prologue. */
-
-static CORE_ADDR
-m88k_analyze_prologue (struct gdbarch *gdbarch,
- CORE_ADDR pc, CORE_ADDR limit,
- struct m88k_frame_cache *cache)
-{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR end = limit;
-
- /* Provide a dummy cache if necessary. */
- if (cache == NULL)
- {
- cache = XALLOCA (struct m88k_frame_cache);
- cache->saved_regs =
- XALLOCAVEC (struct trad_frame_saved_reg, M88K_R31_REGNUM + 1);
-
- /* We only initialize the members we care about. */
- cache->saved_regs[M88K_R1_REGNUM].addr = -1;
- cache->fp_offset = -1;
- }
-
- while (pc < limit)
- {
- struct m88k_prologue_insn *pi = m88k_prologue_insn_table;
- unsigned long insn = m88k_fetch_instruction (pc, byte_order);
-
- while ((insn & pi->mask) != pi->insn)
- pi++;
-
- switch (pi->action)
- {
- case M88K_PIA_SKIP:
- /* If we have a frame pointer, and R1 has been saved,
- consider this instruction as not being part of the
- prologue. */
- if (cache->fp_offset != -1
- && cache->saved_regs[M88K_R1_REGNUM].addr != -1)
- return std::min (pc, end);
- break;
-
- case M88K_PIA_NOTE_ST:
- case M88K_PIA_NOTE_STD:
- /* If no frame has been allocated, the stores aren't part of
- the prologue. */
- if (cache->sp_offset == 0)
- return std::min (pc, end);
-
- /* Record location of saved registers. */
- {
- int regnum = ST_SRC (insn) + M88K_R0_REGNUM;
- ULONGEST offset = ST_OFFSET (insn);
-
- cache->saved_regs[regnum].addr = offset;
- if (pi->action == M88K_PIA_NOTE_STD && regnum < M88K_R31_REGNUM)
- cache->saved_regs[regnum + 1].addr = offset + 4;
- }
- break;
-
- case M88K_PIA_NOTE_SP_ADJUSTMENT:
- /* A second stack pointer adjustment isn't part of the
- prologue. */
- if (cache->sp_offset != 0)
- return std::min (pc, end);
-
- /* Store stack pointer adjustment. */
- cache->sp_offset = -SUBU_OFFSET (insn);
- break;
-
- case M88K_PIA_NOTE_FP_ASSIGNMENT:
- /* A second frame pointer assignment isn't part of the
- prologue. */
- if (cache->fp_offset != -1)
- return std::min (pc, end);
-
- /* Record frame pointer assignment. */
- cache->fp_offset = ADDU_OFFSET (insn);
- break;
-
- case M88K_PIA_NOTE_BRANCH:
- /* The branch instruction isn't part of the prologue, but
- the instruction in the delay slot might be. Limit the
- prologue analysis to the delay slot and record the branch
- instruction as the end of the prologue. */
- limit = std::min (limit, pc + 2 * M88K_INSN_SIZE);
- end = pc;
- break;
-
- case M88K_PIA_NOTE_PROLOGUE_END:
- return std::min (pc, end);
- }
-
- pc += M88K_INSN_SIZE;
- }
-
- return end;
-}
-
-/* An upper limit to the size of the prologue. */
-const int m88k_max_prologue_size = 128 * M88K_INSN_SIZE;
-
-/* Return the address of first real instruction of the function
- starting at PC. */
-
-static CORE_ADDR
-m88k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
-{
- struct symtab_and_line sal;
- CORE_ADDR func_start, func_end;
-
- /* This is the preferred method, find the end of the prologue by
- using the debugging information. */
- if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
- {
- sal = find_pc_line (func_start, 0);
-
- if (sal.end < func_end && pc <= sal.end)
- return sal.end;
- }
-
- return m88k_analyze_prologue (gdbarch, pc, pc + m88k_max_prologue_size,
- NULL);
-}
-
-static struct m88k_frame_cache *
-m88k_frame_cache (struct frame_info *this_frame, void **this_cache)
-{
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- struct m88k_frame_cache *cache;
- CORE_ADDR frame_sp;
-
- if (*this_cache)
- return (struct m88k_frame_cache *) *this_cache;
-
- cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
- cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- cache->fp_offset = -1;
-
- cache->pc = get_frame_func (this_frame);
- if (cache->pc != 0)
- m88k_analyze_prologue (gdbarch, cache->pc, get_frame_pc (this_frame),
- cache);
-
- /* Calculate the stack pointer used in the prologue. */
- if (cache->fp_offset != -1)
- {
- CORE_ADDR fp;
-
- fp = get_frame_register_unsigned (this_frame, M88K_R30_REGNUM);
- frame_sp = fp - cache->fp_offset;
- }
- else
- {
- /* If we know where the return address is saved, we can take a
- solid guess at what the frame pointer should be. */
- if (cache->saved_regs[M88K_R1_REGNUM].addr != -1)
- cache->fp_offset = cache->saved_regs[M88K_R1_REGNUM].addr - 4;
- frame_sp = get_frame_register_unsigned (this_frame, M88K_R31_REGNUM);
- }
-
- /* Now that we know the stack pointer, adjust the location of the
- saved registers. */
- {
- int regnum;
-
- for (regnum = M88K_R0_REGNUM; regnum < M88K_R31_REGNUM; regnum ++)
- if (cache->saved_regs[regnum].addr != -1)
- cache->saved_regs[regnum].addr += frame_sp;
- }
-
- /* Calculate the frame's base. */
- cache->base = frame_sp - cache->sp_offset;
- trad_frame_set_value (cache->saved_regs, M88K_R31_REGNUM, cache->base);
-
- /* Identify SXIP with the return address in R1. */
- cache->saved_regs[M88K_SXIP_REGNUM] = cache->saved_regs[M88K_R1_REGNUM];
-
- *this_cache = cache;
- return cache;
-}
-
-static void
-m88k_frame_this_id (struct frame_info *this_frame, void **this_cache,
- struct frame_id *this_id)
-{
- struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
-
- /* This marks the outermost frame. */
- if (cache->base == 0)
- return;
-
- (*this_id) = frame_id_build (cache->base, cache->pc);
-}
-
-static struct value *
-m88k_frame_prev_register (struct frame_info *this_frame,
- void **this_cache, int regnum)
-{
- struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
-
- if (regnum == M88K_SNIP_REGNUM || regnum == M88K_SFIP_REGNUM)
- {
- struct value *value;
- CORE_ADDR pc;
-
- value = trad_frame_get_prev_register (this_frame, cache->saved_regs,
- M88K_SXIP_REGNUM);
- pc = value_as_long (value);
- release_value (value);
-
- if (regnum == M88K_SFIP_REGNUM)
- pc += 4;
-
- return frame_unwind_got_constant (this_frame, regnum, pc + 4);
- }
-
- return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
-}
-
-static const struct frame_unwind m88k_frame_unwind =
-{
- NORMAL_FRAME,
- default_frame_unwind_stop_reason,
- m88k_frame_this_id,
- m88k_frame_prev_register,
- NULL,
- default_frame_sniffer
-};
-\f
-
-static CORE_ADDR
-m88k_frame_base_address (struct frame_info *this_frame, void **this_cache)
-{
- struct m88k_frame_cache *cache = m88k_frame_cache (this_frame, this_cache);
-
- if (cache->fp_offset != -1)
- return cache->base + cache->sp_offset + cache->fp_offset;
-
- return 0;
-}
-
-static const struct frame_base m88k_frame_base =
-{
- &m88k_frame_unwind,
- m88k_frame_base_address,
- m88k_frame_base_address,
- m88k_frame_base_address
-};
-\f
-
-/* Core file support. */
-
-/* Supply register REGNUM from the buffer specified by GREGS and LEN
- in the general-purpose register set REGSET to register cache
- REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
-
-static void
-m88k_supply_gregset (const struct regset *regset,
- struct regcache *regcache,
- int regnum, const void *gregs, size_t len)
-{
- const gdb_byte *regs = (const gdb_byte *) gregs;
- int i;
-
- for (i = 0; i < M88K_NUM_REGS; i++)
- {
- if (regnum == i || regnum == -1)
- regcache_raw_supply (regcache, i, regs + i * 4);
- }
-}
-
-/* Motorola 88000 register set. */
-
-static const struct regset m88k_gregset =
-{
- NULL,
- m88k_supply_gregset
-};
-
-/* Iterate over supported core file register note sections. */
-
-static void
-m88k_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
-{
- cb (".reg", M88K_NUM_REGS * 4, &m88k_gregset, NULL, cb_data);
-}
-\f
-
-static struct gdbarch *
-m88k_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. */
- gdbarch = gdbarch_alloc (&info, NULL);
-
- /* There is no real `long double'. */
- set_gdbarch_long_double_bit (gdbarch, 64);
- set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
-
- set_gdbarch_num_regs (gdbarch, M88K_NUM_REGS);
- set_gdbarch_register_name (gdbarch, m88k_register_name);
- set_gdbarch_register_type (gdbarch, m88k_register_type);
-
- /* Register numbers of various important registers. */
- set_gdbarch_sp_regnum (gdbarch, M88K_R31_REGNUM);
- set_gdbarch_pc_regnum (gdbarch, M88K_SXIP_REGNUM);
-
- /* Core file support. */
- set_gdbarch_iterate_over_regset_sections
- (gdbarch, m88k_iterate_over_regset_sections);
-
- set_gdbarch_skip_prologue (gdbarch, m88k_skip_prologue);
-
- /* Stack grows downward. */
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
-
- /* Call dummy code. */
- set_gdbarch_push_dummy_call (gdbarch, m88k_push_dummy_call);
- set_gdbarch_dummy_id (gdbarch, m88k_dummy_id);
-
- /* Return value info. */
- set_gdbarch_return_value (gdbarch, m88k_return_value);
-
- set_gdbarch_addr_bits_remove (gdbarch, m88k_addr_bits_remove);
- set_gdbarch_breakpoint_kind_from_pc (gdbarch, m88k_breakpoint::kind_from_pc);
- set_gdbarch_sw_breakpoint_from_kind (gdbarch, m88k_breakpoint::bp_from_kind);
- set_gdbarch_unwind_pc (gdbarch, m88k_unwind_pc);
- set_gdbarch_write_pc (gdbarch, m88k_write_pc);
-
- frame_base_set_default (gdbarch, &m88k_frame_base);
- frame_unwind_append_unwinder (gdbarch, &m88k_frame_unwind);
-
- return gdbarch;
-}
-
-void
-_initialize_m88k_tdep (void)
-{
- gdbarch_register (bfd_arch_m88k, m88k_gdbarch_init, NULL);
-}
projects / binutils-gdb.git / commitdiff