--- /dev/null
+/* Target-dependent code for the Motorola 88000 series.
+
+ Copyright 2004 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 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "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 "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "m88k-tdep.h"
+
+/* Fetch the instruction at PC. */
+
+static unsigned long
+m88k_fetch_instruction (CORE_ADDR pc)
+{
+ return read_memory_unsigned_integer (pc, 4);
+}
+
+/* Register information. */
+
+/* Return the name of register REGNUM. */
+
+static const char *
+m88k_register_name (int regnum)
+{
+ static 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_void_func_ptr;
+
+ /* R30 and R31 typically contains data addresses. */
+ if (regnum == M88K_R30_REGNUM || regnum == M88K_R31_REGNUM)
+ return builtin_type_void_data_ptr;
+
+ return builtin_type_int32;
+}
+\f
+
+static CORE_ADDR
+m88k_addr_bits_remove (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. */
+
+static const unsigned char *
+m88k_breakpoint_from_pc (CORE_ADDR *pc, int *len)
+{
+ /* tb 0,r0,511 */
+ static unsigned char break_insn[] = { 0xf0, 0x00, 0xd1, 0xff };
+
+ *len = sizeof (break_insn);
+ return break_insn;
+}
+
+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 (pc);
+}
+
+static void
+m88k_write_pc (CORE_ADDR pc, ptid_t ptid)
+{
+ /* 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. */
+
+ write_register_pid (M88K_SXIP_REGNUM, pc, ptid);
+ write_register_pid (M88K_SNIP_REGNUM, pc | 2, ptid);
+ write_register_pid (M88K_SFIP_REGNUM, (pc + 4) | 2, ptid);
+}
+\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:
+ {
+ /* 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)
+{
+ 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_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++)
+ {
+ char *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, CORE_ADDR func_addr,
+ 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_unwind_dummy_id (struct gdbarch *arch, struct frame_info *next_frame)
+{
+ CORE_ADDR sp;
+
+ sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
+ return frame_id_build (sp, frame_pc_unwind (next_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 type *type,
+ struct regcache *regcache, void *readbuf,
+ const void *writebuf)
+{
+ int len = TYPE_LENGTH (type);
+ char 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 (CORE_ADDR pc, CORE_ADDR limit,
+ struct m88k_frame_cache *cache)
+{
+ CORE_ADDR end = limit;
+
+ /* Provide a dummy cache if necessary. */
+ if (cache == NULL)
+ {
+ size_t sizeof_saved_regs =
+ (M88K_R31_REGNUM + 1) * sizeof (struct trad_frame_saved_reg);
+
+ cache = alloca (sizeof (struct m88k_frame_cache));
+ cache->saved_regs = alloca (sizeof_saved_regs);
+
+ /* 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);
+
+ 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 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 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 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 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 = pc + M88K_INSN_SIZE;
+ end = pc;
+ break;
+
+ case M88K_PIA_NOTE_PROLOGUE_END:
+ return 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 (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 (pc, pc + m88k_max_prologue_size, NULL);
+}
+
+struct m88k_frame_cache *
+m88k_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct m88k_frame_cache *cache;
+ CORE_ADDR frame_sp;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+ cache->fp_offset = -1;
+
+ cache->pc = frame_func_unwind (next_frame);
+ if (cache->pc != 0)
+ {
+ CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
+ m88k_analyze_prologue (cache->pc, addr_in_block, cache);
+ }
+
+ /* Calculate the stack pointer used in the prologue. */
+ if (cache->fp_offset != -1)
+ {
+ CORE_ADDR fp;
+
+ fp = frame_unwind_register_unsigned (next_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 = frame_unwind_register_unsigned (next_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 *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
+
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+m88k_frame_prev_register (struct frame_info *next_frame, void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
+
+ if (regnum == M88K_SNIP_REGNUM || regnum == M88K_SFIP_REGNUM)
+ {
+ if (valuep)
+ {
+ CORE_ADDR pc;
+
+ trad_frame_prev_register (next_frame, cache->saved_regs,
+ M88K_SXIP_REGNUM, optimizedp,
+ lvalp, addrp, realnump, valuep);
+
+ pc = extract_unsigned_integer (valuep, 4);
+ if (regnum == M88K_SNIP_REGNUM)
+ pc += 4;
+ else if (regnum == M88K_SFIP_REGNUM)
+ pc += 8;
+ store_unsigned_integer (valuep, 4, pc);
+ }
+
+ /* It's a computed value. */
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ return;
+ }
+
+ trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m88k_frame_unwind =
+{
+ NORMAL_FRAME,
+ m88k_frame_this_id,
+ m88k_frame_prev_register
+};
+
+static const struct frame_unwind *
+m88k_frame_sniffer (struct frame_info *next_frame)
+{
+ return &m88k_frame_unwind;
+}
+\f
+
+static CORE_ADDR
+m88k_frame_base_address (struct frame_info *next_frame, void **this_cache)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_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 char *regs = 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 struct regset m88k_gregset =
+{
+ NULL,
+ m88k_supply_gregset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+
+static const struct regset *
+m88k_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= M88K_NUM_REGS * 4)
+ return &m88k_gregset;
+
+ return NULL;
+}
+\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, &floatformat_ieee_double_big);
+
+ 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_regset_from_core_section
+ (gdbarch, m88k_regset_from_core_section);
+
+ set_gdbarch_print_insn (gdbarch, print_insn_m88k);
+
+ 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_unwind_dummy_id (gdbarch, m88k_unwind_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_from_pc (gdbarch, m88k_breakpoint_from_pc);
+ 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_sniffer (gdbarch, m88k_frame_sniffer);
+
+ return gdbarch;
+}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_m88k_tdep (void);
+
+void
+_initialize_m88k_tdep (void)
+{
+ gdbarch_register (bfd_arch_m88k, m88k_gdbarch_init, NULL);
+}
projects / binutils-gdb.git / commitdiff