1 /* Target-dependent code for Motorola 68HC11 & 68HC12
2 Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
3 Contributed by Stephane Carrez, stcarrez@nerim.fr
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #include "gdb_string.h"
34 #include "arch-utils.h"
36 #include "reggroups.h"
39 #include "opcode/m68hc11.h"
40 #include "elf/m68hc11.h"
43 /* Macros for setting and testing a bit in a minimal symbol.
44 For 68HC11/68HC12 we have two flags that tell which return
45 type the function is using. This is used for prologue and frame
46 analysis to compute correct stack frame layout.
48 The MSB of the minimal symbol's "info" field is used for this purpose.
49 This field is already being used to store the symbol size, so the
50 assumption is that the symbol size cannot exceed 2^30.
52 MSYMBOL_SET_RTC Actually sets the "RTC" bit.
53 MSYMBOL_SET_RTI Actually sets the "RTI" bit.
54 MSYMBOL_IS_RTC Tests the "RTC" bit in a minimal symbol.
55 MSYMBOL_IS_RTI Tests the "RTC" bit in a minimal symbol.
56 MSYMBOL_SIZE Returns the size of the minimal symbol,
57 i.e. the "info" field with the "special" bit
60 #define MSYMBOL_SET_RTC(msym) \
61 MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
64 #define MSYMBOL_SET_RTI(msym) \
65 MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
68 #define MSYMBOL_IS_RTC(msym) \
69 (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
71 #define MSYMBOL_IS_RTI(msym) \
72 (((long) MSYMBOL_INFO (msym) & 0x40000000) != 0)
74 #define MSYMBOL_SIZE(msym) \
75 ((long) MSYMBOL_INFO (msym) & 0x3fffffff)
77 enum insn_return_kind {
84 /* Register numbers of various important registers.
85 Note that some of these values are "real" register numbers,
86 and correspond to the general registers of the machine,
87 and some are "phony" register numbers which are too large
88 to be actual register numbers as far as the user is concerned
89 but do serve to get the desired values when passed to read_register. */
91 #define HARD_X_REGNUM 0
92 #define HARD_D_REGNUM 1
93 #define HARD_Y_REGNUM 2
94 #define HARD_SP_REGNUM 3
95 #define HARD_PC_REGNUM 4
97 #define HARD_A_REGNUM 5
98 #define HARD_B_REGNUM 6
99 #define HARD_CCR_REGNUM 7
101 /* 68HC12 page number register.
102 Note: to keep a compatibility with gcc register naming, we must
103 not have to rename FP and other soft registers. The page register
104 is a real hard register and must therefore be counted by NUM_REGS.
105 For this it has the same number as Z register (which is not used). */
106 #define HARD_PAGE_REGNUM 8
107 #define M68HC11_LAST_HARD_REG (HARD_PAGE_REGNUM)
109 /* Z is replaced by X or Y by gcc during machine reorg.
110 ??? There is no way to get it and even know whether
111 it's in X or Y or in ZS. */
112 #define SOFT_Z_REGNUM 8
114 /* Soft registers. These registers are special. There are treated
115 like normal hard registers by gcc and gdb (ie, within dwarf2 info).
116 They are physically located in memory. */
117 #define SOFT_FP_REGNUM 9
118 #define SOFT_TMP_REGNUM 10
119 #define SOFT_ZS_REGNUM 11
120 #define SOFT_XY_REGNUM 12
121 #define SOFT_UNUSED_REGNUM 13
122 #define SOFT_D1_REGNUM 14
123 #define SOFT_D32_REGNUM (SOFT_D1_REGNUM+31)
124 #define M68HC11_MAX_SOFT_REGS 32
126 #define M68HC11_NUM_REGS (8)
127 #define M68HC11_NUM_PSEUDO_REGS (M68HC11_MAX_SOFT_REGS+5)
128 #define M68HC11_ALL_REGS (M68HC11_NUM_REGS+M68HC11_NUM_PSEUDO_REGS)
130 #define M68HC11_REG_SIZE (2)
132 #define M68HC12_NUM_REGS (9)
133 #define M68HC12_NUM_PSEUDO_REGS ((M68HC11_MAX_SOFT_REGS+5)+1-1)
134 #define M68HC12_HARD_PC_REGNUM (SOFT_D32_REGNUM+1)
136 struct insn_sequence;
139 /* Stack pointer correction value. For 68hc11, the stack pointer points
140 to the next push location. An offset of 1 must be applied to obtain
141 the address where the last value is saved. For 68hc12, the stack
142 pointer points to the last value pushed. No offset is necessary. */
143 int stack_correction;
145 /* Description of instructions in the prologue. */
146 struct insn_sequence *prologue;
148 /* True if the page memory bank register is available
150 int use_page_register;
152 /* ELF flags for ABI. */
156 #define M6811_TDEP gdbarch_tdep (current_gdbarch)
157 #define STACK_CORRECTION (M6811_TDEP->stack_correction)
158 #define USE_PAGE_REGISTER (M6811_TDEP->use_page_register)
160 struct frame_extra_info
165 enum insn_return_kind return_kind;
168 /* Table of registers for 68HC11. This includes the hard registers
169 and the soft registers used by GCC. */
171 m68hc11_register_names[] =
173 "x", "d", "y", "sp", "pc", "a", "b",
174 "ccr", "page", "frame","tmp", "zs", "xy", 0,
175 "d1", "d2", "d3", "d4", "d5", "d6", "d7",
176 "d8", "d9", "d10", "d11", "d12", "d13", "d14",
177 "d15", "d16", "d17", "d18", "d19", "d20", "d21",
178 "d22", "d23", "d24", "d25", "d26", "d27", "d28",
179 "d29", "d30", "d31", "d32"
182 struct m68hc11_soft_reg
188 static struct m68hc11_soft_reg soft_regs[M68HC11_ALL_REGS];
190 #define M68HC11_FP_ADDR soft_regs[SOFT_FP_REGNUM].addr
192 static int soft_min_addr;
193 static int soft_max_addr;
194 static int soft_reg_initialized = 0;
196 /* Look in the symbol table for the address of a pseudo register
197 in memory. If we don't find it, pretend the register is not used
198 and not available. */
200 m68hc11_get_register_info (struct m68hc11_soft_reg *reg, const char *name)
202 struct minimal_symbol *msymbol;
204 msymbol = lookup_minimal_symbol (name, NULL, NULL);
207 reg->addr = SYMBOL_VALUE_ADDRESS (msymbol);
208 reg->name = xstrdup (name);
210 /* Keep track of the address range for soft registers. */
211 if (reg->addr < (CORE_ADDR) soft_min_addr)
212 soft_min_addr = reg->addr;
213 if (reg->addr > (CORE_ADDR) soft_max_addr)
214 soft_max_addr = reg->addr;
223 /* Initialize the table of soft register addresses according
224 to the symbol table. */
226 m68hc11_initialize_register_info (void)
230 if (soft_reg_initialized)
233 soft_min_addr = INT_MAX;
235 for (i = 0; i < M68HC11_ALL_REGS; i++)
237 soft_regs[i].name = 0;
240 m68hc11_get_register_info (&soft_regs[SOFT_FP_REGNUM], "_.frame");
241 m68hc11_get_register_info (&soft_regs[SOFT_TMP_REGNUM], "_.tmp");
242 m68hc11_get_register_info (&soft_regs[SOFT_ZS_REGNUM], "_.z");
243 soft_regs[SOFT_Z_REGNUM] = soft_regs[SOFT_ZS_REGNUM];
244 m68hc11_get_register_info (&soft_regs[SOFT_XY_REGNUM], "_.xy");
246 for (i = SOFT_D1_REGNUM; i < M68HC11_MAX_SOFT_REGS; i++)
250 sprintf (buf, "_.d%d", i - SOFT_D1_REGNUM + 1);
251 m68hc11_get_register_info (&soft_regs[i], buf);
254 if (soft_regs[SOFT_FP_REGNUM].name == 0)
256 warning ("No frame soft register found in the symbol table.\n");
257 warning ("Stack backtrace will not work.\n");
259 soft_reg_initialized = 1;
262 /* Given an address in memory, return the soft register number if
263 that address corresponds to a soft register. Returns -1 if not. */
265 m68hc11_which_soft_register (CORE_ADDR addr)
269 if (addr < soft_min_addr || addr > soft_max_addr)
272 for (i = SOFT_FP_REGNUM; i < M68HC11_ALL_REGS; i++)
274 if (soft_regs[i].name && soft_regs[i].addr == addr)
280 /* Fetch a pseudo register. The 68hc11 soft registers are treated like
281 pseudo registers. They are located in memory. Translate the register
282 fetch into a memory read. */
284 m68hc11_pseudo_register_read (struct gdbarch *gdbarch,
285 struct regcache *regcache,
286 int regno, void *buf)
288 /* The PC is a pseudo reg only for 68HC12 with the memory bank
290 if (regno == M68HC12_HARD_PC_REGNUM)
293 const int regsize = TYPE_LENGTH (builtin_type_uint32);
295 regcache_cooked_read_unsigned (regcache, HARD_PC_REGNUM, &pc);
296 if (pc >= 0x8000 && pc < 0xc000)
300 regcache_cooked_read_unsigned (regcache, HARD_PAGE_REGNUM, &page);
305 store_unsigned_integer (buf, regsize, pc);
309 m68hc11_initialize_register_info ();
311 /* Fetch a soft register: translate into a memory read. */
312 if (soft_regs[regno].name)
314 target_read_memory (soft_regs[regno].addr, buf, 2);
322 /* Store a pseudo register. Translate the register store
323 into a memory write. */
325 m68hc11_pseudo_register_write (struct gdbarch *gdbarch,
326 struct regcache *regcache,
327 int regno, const void *buf)
329 /* The PC is a pseudo reg only for 68HC12 with the memory bank
331 if (regno == M68HC12_HARD_PC_REGNUM)
333 const int regsize = TYPE_LENGTH (builtin_type_uint32);
334 char *tmp = alloca (regsize);
337 memcpy (tmp, buf, regsize);
338 pc = extract_unsigned_integer (tmp, regsize);
342 regcache_cooked_write_unsigned (regcache, HARD_PAGE_REGNUM,
345 regcache_cooked_write_unsigned (regcache, HARD_PC_REGNUM,
349 regcache_cooked_write_unsigned (regcache, HARD_PC_REGNUM, pc);
353 m68hc11_initialize_register_info ();
355 /* Store a soft register: translate into a memory write. */
356 if (soft_regs[regno].name)
358 const int regsize = 2;
359 char *tmp = alloca (regsize);
360 memcpy (tmp, buf, regsize);
361 target_write_memory (soft_regs[regno].addr, tmp, regsize);
366 m68hc11_register_name (int reg_nr)
368 if (reg_nr == M68HC12_HARD_PC_REGNUM && USE_PAGE_REGISTER)
370 if (reg_nr == HARD_PC_REGNUM && USE_PAGE_REGISTER)
375 if (reg_nr >= M68HC11_ALL_REGS)
378 /* If we don't know the address of a soft register, pretend it
380 if (reg_nr > M68HC11_LAST_HARD_REG && soft_regs[reg_nr].name == 0)
382 return m68hc11_register_names[reg_nr];
385 static const unsigned char *
386 m68hc11_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
388 static unsigned char breakpoint[] = {0x0};
390 *lenptr = sizeof (breakpoint);
394 /* Immediately after a function call, return the saved pc before the frame
398 m68hc11_saved_pc_after_call (struct frame_info *frame)
403 regcache_cooked_read_unsigned (current_regcache, HARD_SP_REGNUM, &sp);
404 sp += STACK_CORRECTION;
406 return read_memory_integer (addr, 2) & 0x0FFFF;
410 m68hc11_frame_saved_pc (struct frame_info *frame)
412 return get_frame_extra_info (frame)->return_pc;
416 m68hc11_frame_args_address (struct frame_info *frame)
420 addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION + 2;
421 if (get_frame_extra_info (frame)->return_kind == RETURN_RTC)
423 else if (get_frame_extra_info (frame)->return_kind == RETURN_RTI)
429 /* Discard from the stack the innermost frame, restoring all saved
433 m68hc11_pop_frame (void)
435 register struct frame_info *frame = get_current_frame ();
436 register CORE_ADDR fp, sp;
439 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
440 get_frame_base (frame),
441 get_frame_base (frame)))
442 generic_pop_dummy_frame ();
445 fp = get_frame_base (frame);
446 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
448 /* Copy regs from where they were saved in the frame. */
449 for (regnum = 0; regnum < M68HC11_ALL_REGS; regnum++)
450 if (get_frame_saved_regs (frame)[regnum])
451 write_register (regnum,
452 read_memory_integer (get_frame_saved_regs (frame)[regnum], 2));
454 write_register (HARD_PC_REGNUM, get_frame_extra_info (frame)->return_pc);
455 sp = (fp + get_frame_extra_info (frame)->size + 2) & 0x0ffff;
456 write_register (HARD_SP_REGNUM, sp);
458 flush_cached_frames ();
462 /* 68HC11 & 68HC12 prologue analysis.
467 /* 68HC11 opcodes. */
468 #undef M6811_OP_PAGE2
469 #define M6811_OP_PAGE2 (0x18)
470 #define M6811_OP_LDX (0xde)
471 #define M6811_OP_LDX_EXT (0xfe)
472 #define M6811_OP_PSHX (0x3c)
473 #define M6811_OP_STS (0x9f)
474 #define M6811_OP_STS_EXT (0xbf)
475 #define M6811_OP_TSX (0x30)
476 #define M6811_OP_XGDX (0x8f)
477 #define M6811_OP_ADDD (0xc3)
478 #define M6811_OP_TXS (0x35)
479 #define M6811_OP_DES (0x34)
481 /* 68HC12 opcodes. */
482 #define M6812_OP_PAGE2 (0x18)
483 #define M6812_OP_MOVW (0x01)
484 #define M6812_PB_PSHW (0xae)
485 #define M6812_OP_STS (0x5f)
486 #define M6812_OP_STS_EXT (0x7f)
487 #define M6812_OP_LEAS (0x1b)
488 #define M6812_OP_PSHX (0x34)
489 #define M6812_OP_PSHY (0x35)
491 /* Operand extraction. */
492 #define OP_DIRECT (0x100) /* 8-byte direct addressing. */
493 #define OP_IMM_LOW (0x200) /* Low part of 16-bit constant/address. */
494 #define OP_IMM_HIGH (0x300) /* High part of 16-bit constant/address. */
495 #define OP_PBYTE (0x400) /* 68HC12 indexed operand. */
497 /* Identification of the sequence. */
501 P_SAVE_REG, /* Save a register on the stack. */
502 P_SET_FRAME, /* Setup the frame pointer. */
503 P_LOCAL_1, /* Allocate 1 byte for locals. */
504 P_LOCAL_2, /* Allocate 2 bytes for locals. */
505 P_LOCAL_N /* Allocate N bytes for locals. */
508 struct insn_sequence {
509 enum m6811_seq_type type;
511 unsigned short code[MAX_CODES];
514 /* Sequence of instructions in the 68HC11 function prologue. */
515 static struct insn_sequence m6811_prologue[] = {
516 /* Sequences to save a soft-register. */
517 { P_SAVE_REG, 3, { M6811_OP_LDX, OP_DIRECT,
519 { P_SAVE_REG, 5, { M6811_OP_PAGE2, M6811_OP_LDX, OP_DIRECT,
520 M6811_OP_PAGE2, M6811_OP_PSHX } },
521 { P_SAVE_REG, 4, { M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW,
523 { P_SAVE_REG, 6, { M6811_OP_PAGE2, M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW,
524 M6811_OP_PAGE2, M6811_OP_PSHX } },
526 /* Sequences to allocate local variables. */
527 { P_LOCAL_N, 7, { M6811_OP_TSX,
529 M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW,
532 { P_LOCAL_N, 11, { M6811_OP_PAGE2, M6811_OP_TSX,
533 M6811_OP_PAGE2, M6811_OP_XGDX,
534 M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW,
535 M6811_OP_PAGE2, M6811_OP_XGDX,
536 M6811_OP_PAGE2, M6811_OP_TXS } },
537 { P_LOCAL_1, 1, { M6811_OP_DES } },
538 { P_LOCAL_2, 1, { M6811_OP_PSHX } },
539 { P_LOCAL_2, 2, { M6811_OP_PAGE2, M6811_OP_PSHX } },
541 /* Initialize the frame pointer. */
542 { P_SET_FRAME, 2, { M6811_OP_STS, OP_DIRECT } },
543 { P_SET_FRAME, 3, { M6811_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } },
548 /* Sequence of instructions in the 68HC12 function prologue. */
549 static struct insn_sequence m6812_prologue[] = {
550 { P_SAVE_REG, 5, { M6812_OP_PAGE2, M6812_OP_MOVW, M6812_PB_PSHW,
551 OP_IMM_HIGH, OP_IMM_LOW } },
552 { P_SET_FRAME, 2, { M6812_OP_STS, OP_DIRECT } },
553 { P_SET_FRAME, 3, { M6812_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } },
554 { P_LOCAL_N, 2, { M6812_OP_LEAS, OP_PBYTE } },
555 { P_LOCAL_2, 1, { M6812_OP_PSHX } },
556 { P_LOCAL_2, 1, { M6812_OP_PSHY } },
561 /* Analyze the sequence of instructions starting at the given address.
562 Returns a pointer to the sequence when it is recognized and
563 the optional value (constant/address) associated with it.
564 Advance the pc for the next sequence. */
565 static struct insn_sequence *
566 m68hc11_analyze_instruction (struct insn_sequence *seq, CORE_ADDR *pc,
569 unsigned char buffer[MAX_CODES];
576 for (; seq->type != P_LAST; seq++)
579 for (j = 0; j < seq->length; j++)
583 buffer[bufsize] = read_memory_unsigned_integer (*pc + bufsize,
587 /* Continue while we match the opcode. */
588 if (seq->code[j] == buffer[j])
591 if ((seq->code[j] & 0xf00) == 0)
594 /* Extract a sequence parameter (address or constant). */
595 switch (seq->code[j])
598 cur_val = (CORE_ADDR) buffer[j];
602 cur_val = cur_val & 0x0ff;
603 cur_val |= (buffer[j] << 8);
608 cur_val |= buffer[j];
612 if ((buffer[j] & 0xE0) == 0x80)
614 v = buffer[j] & 0x1f;
618 else if ((buffer[j] & 0xfe) == 0xf0)
620 v = read_memory_unsigned_integer (*pc + j + 1, 1);
625 else if (buffer[j] == 0xf2)
627 v = read_memory_unsigned_integer (*pc + j + 1, 2);
635 /* We have a full match. */
636 if (j == seq->length)
646 /* Return the instruction that the function at the PC is using. */
647 static enum insn_return_kind
648 m68hc11_get_return_insn (CORE_ADDR pc)
650 struct minimal_symbol *sym;
652 /* A flag indicating that this is a STO_M68HC12_FAR or STO_M68HC12_INTERRUPT
653 function is stored by elfread.c in the high bit of the info field.
654 Use this to decide which instruction the function uses to return. */
655 sym = lookup_minimal_symbol_by_pc (pc);
659 if (MSYMBOL_IS_RTC (sym))
661 else if (MSYMBOL_IS_RTI (sym))
668 /* Analyze the function prologue to find some information
670 - the PC of the first line (for m68hc11_skip_prologue)
671 - the offset of the previous frame saved address (from current frame)
672 - the soft registers which are pushed. */
674 m68hc11_guess_from_prologue (CORE_ADDR pc, CORE_ADDR fp,
675 CORE_ADDR *first_line,
676 int *frame_offset, CORE_ADDR *pushed_regs)
681 int found_frame_point;
685 struct insn_sequence *seq_table;
687 first_pc = get_pc_function_start (pc);
690 m68hc11_initialize_register_info ();
698 seq_table = gdbarch_tdep (current_gdbarch)->prologue;
700 /* The 68hc11 stack is as follows:
716 +-----------+ <--- current frame
719 With most processors (like 68K) the previous frame can be computed
720 easily because it is always at a fixed offset (see link/unlink).
721 That is, locals are accessed with negative offsets, arguments are
722 accessed with positive ones. Since 68hc11 only supports offsets
723 in the range [0..255], the frame is defined at the bottom of
724 locals (see picture).
726 The purpose of the analysis made here is to find out the size
727 of locals in this function. An alternative to this is to use
728 DWARF2 info. This would be better but I don't know how to
729 access dwarf2 debug from this function.
731 Walk from the function entry point to the point where we save
732 the frame. While walking instructions, compute the size of bytes
733 which are pushed. This gives us the index to access the previous
736 We limit the search to 128 bytes so that the algorithm is bounded
737 in case of random and wrong code. We also stop and abort if
738 we find an instruction which is not supposed to appear in the
739 prologue (as generated by gcc 2.95, 2.96).
743 found_frame_point = 0;
745 save_addr = fp + STACK_CORRECTION;
746 while (!done && pc + 2 < func_end)
748 struct insn_sequence *seq;
751 seq = m68hc11_analyze_instruction (seq_table, &pc, &val);
755 if (seq->type == P_SAVE_REG)
757 if (found_frame_point)
759 saved_reg = m68hc11_which_soft_register (val);
765 pushed_regs[saved_reg] = save_addr;
772 else if (seq->type == P_SET_FRAME)
774 found_frame_point = 1;
775 *frame_offset = size;
777 else if (seq->type == P_LOCAL_1)
781 else if (seq->type == P_LOCAL_2)
785 else if (seq->type == P_LOCAL_N)
787 /* Stack pointer is decremented for the allocation. */
789 size -= (int) (val) | 0xffff0000;
798 m68hc11_skip_prologue (CORE_ADDR pc)
800 CORE_ADDR func_addr, func_end;
801 struct symtab_and_line sal;
804 /* If we have line debugging information, then the end of the
805 prologue should be the first assembly instruction of the
806 first source line. */
807 if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
809 sal = find_pc_line (func_addr, 0);
810 if (sal.end && sal.end < func_end)
814 m68hc11_guess_from_prologue (pc, 0, &pc, &frame_offset, 0);
818 /* Given a GDB frame, determine the address of the calling function's
819 frame. This will be used to create a new GDB frame struct, and
820 then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
821 will be called for the new frame. */
824 m68hc11_frame_chain (struct frame_info *frame)
828 if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
829 get_frame_base (frame),
830 get_frame_base (frame)))
831 return get_frame_base (frame); /* dummy frame same as caller's frame */
833 if (get_frame_extra_info (frame)->return_pc == 0
834 || inside_entry_file (get_frame_extra_info (frame)->return_pc))
835 return (CORE_ADDR) 0;
837 if (get_frame_base (frame) == 0)
839 return (CORE_ADDR) 0;
842 addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION - 2;
843 addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF;
847 /* Put here the code to store, into a struct frame_saved_regs, the
848 addresses of the saved registers of frame described by FRAME_INFO.
849 This includes special registers such as pc and fp saved in special
850 ways in the stack frame. sp is even more special: the address we
851 return for it IS the sp for the next frame. */
853 m68hc11_frame_init_saved_regs (struct frame_info *fi)
858 if (get_frame_saved_regs (fi) == NULL)
859 frame_saved_regs_zalloc (fi);
861 memset (get_frame_saved_regs (fi), 0, SIZEOF_FRAME_SAVED_REGS);
863 pc = get_frame_pc (fi);
864 get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (pc);
865 m68hc11_guess_from_prologue (pc, get_frame_base (fi), &pc,
866 &get_frame_extra_info (fi)->size,
867 get_frame_saved_regs (fi));
869 addr = get_frame_base (fi) + get_frame_extra_info (fi)->size + STACK_CORRECTION;
870 if (soft_regs[SOFT_FP_REGNUM].name)
871 get_frame_saved_regs (fi)[SOFT_FP_REGNUM] = addr - 2;
873 /* Take into account how the function was called/returns. */
874 if (get_frame_extra_info (fi)->return_kind == RETURN_RTC)
876 get_frame_saved_regs (fi)[HARD_PAGE_REGNUM] = addr;
879 else if (get_frame_extra_info (fi)->return_kind == RETURN_RTI)
881 get_frame_saved_regs (fi)[HARD_CCR_REGNUM] = addr;
882 get_frame_saved_regs (fi)[HARD_D_REGNUM] = addr + 1;
883 get_frame_saved_regs (fi)[HARD_X_REGNUM] = addr + 3;
884 get_frame_saved_regs (fi)[HARD_Y_REGNUM] = addr + 5;
887 get_frame_saved_regs (fi)[HARD_SP_REGNUM] = addr;
888 get_frame_saved_regs (fi)[HARD_PC_REGNUM] = get_frame_saved_regs (fi)[HARD_SP_REGNUM];
892 m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi)
896 frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
898 if (get_next_frame (fi))
899 deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));
901 m68hc11_frame_init_saved_regs (fi);
905 get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (get_frame_pc (fi));
906 get_frame_extra_info (fi)->return_pc = m68hc11_saved_pc_after_call (fi);
910 addr = get_frame_saved_regs (fi)[HARD_PC_REGNUM];
911 addr = read_memory_unsigned_integer (addr, 2) & 0x0ffff;
913 /* Take into account the 68HC12 specific call (PC + page). */
914 if (get_frame_extra_info (fi)->return_kind == RETURN_RTC
915 && addr >= 0x08000 && addr < 0x0c000
916 && USE_PAGE_REGISTER)
918 CORE_ADDR page_addr = get_frame_saved_regs (fi)[HARD_PAGE_REGNUM];
920 unsigned page = read_memory_unsigned_integer (page_addr, 1);
922 addr += ((page & 0x0ff) << 14);
925 get_frame_extra_info (fi)->return_pc = addr;
929 /* Same as 'info reg' but prints the registers in a different way. */
931 show_regs (char *args, int from_tty)
933 int ccr = read_register (HARD_CCR_REGNUM);
937 printf_filtered ("PC=%04x SP=%04x FP=%04x CCR=%02x %c%c%c%c%c%c%c%c\n",
938 (int) read_register (HARD_PC_REGNUM),
939 (int) read_register (HARD_SP_REGNUM),
940 (int) read_register (SOFT_FP_REGNUM),
942 ccr & M6811_S_BIT ? 'S' : '-',
943 ccr & M6811_X_BIT ? 'X' : '-',
944 ccr & M6811_H_BIT ? 'H' : '-',
945 ccr & M6811_I_BIT ? 'I' : '-',
946 ccr & M6811_N_BIT ? 'N' : '-',
947 ccr & M6811_Z_BIT ? 'Z' : '-',
948 ccr & M6811_V_BIT ? 'V' : '-',
949 ccr & M6811_C_BIT ? 'C' : '-');
951 printf_filtered ("D=%04x IX=%04x IY=%04x",
952 (int) read_register (HARD_D_REGNUM),
953 (int) read_register (HARD_X_REGNUM),
954 (int) read_register (HARD_Y_REGNUM));
956 if (USE_PAGE_REGISTER)
958 printf_filtered (" Page=%02x",
959 (int) read_register (HARD_PAGE_REGNUM));
961 printf_filtered ("\n");
964 for (i = SOFT_D1_REGNUM; i < M68HC11_ALL_REGS; i++)
966 /* Skip registers which are not defined in the symbol table. */
967 if (soft_regs[i].name == 0)
970 printf_filtered ("D%d=%04x",
971 i - SOFT_D1_REGNUM + 1,
972 (int) read_register (i));
975 printf_filtered ("\n");
977 printf_filtered (" ");
979 if (nr && (nr % 8) != 7)
980 printf_filtered ("\n");
984 m68hc11_stack_align (CORE_ADDR addr)
986 return ((addr + 1) & -2);
990 m68hc11_push_arguments (int nargs,
994 CORE_ADDR struct_addr)
998 int first_stack_argnum;
1005 first_stack_argnum = 0;
1008 /* The struct is allocated on the stack and gdb used the stack
1009 pointer for the address of that struct. We must apply the
1010 stack offset on the address. */
1011 write_register (HARD_D_REGNUM, struct_addr + STACK_CORRECTION);
1015 type = VALUE_TYPE (args[0]);
1016 len = TYPE_LENGTH (type);
1018 /* First argument is passed in D and X registers. */
1021 LONGEST v = extract_unsigned_integer (VALUE_CONTENTS (args[0]), len);
1022 first_stack_argnum = 1;
1023 write_register (HARD_D_REGNUM, v);
1027 write_register (HARD_X_REGNUM, v);
1031 for (argnum = first_stack_argnum; argnum < nargs; argnum++)
1033 type = VALUE_TYPE (args[argnum]);
1034 stack_alloc += (TYPE_LENGTH (type) + 1) & -2;
1038 stack_offset = STACK_CORRECTION;
1039 for (argnum = first_stack_argnum; argnum < nargs; argnum++)
1041 type = VALUE_TYPE (args[argnum]);
1042 len = TYPE_LENGTH (type);
1044 val = (char*) VALUE_CONTENTS (args[argnum]);
1045 write_memory (sp + stack_offset, val, len);
1046 stack_offset += len;
1049 static char zero = 0;
1051 write_memory (sp + stack_offset, &zero, 1);
1059 /* Return the GDB type object for the "standard" data type
1060 of data in register N. */
1062 static struct type *
1063 m68hc11_register_type (struct gdbarch *gdbarch, int reg_nr)
1067 case HARD_PAGE_REGNUM:
1070 case HARD_CCR_REGNUM:
1071 return builtin_type_uint8;
1073 case M68HC12_HARD_PC_REGNUM:
1074 return builtin_type_uint32;
1077 return builtin_type_uint16;
1082 m68hc11_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
1084 /* The struct address computed by gdb is on the stack.
1085 It uses the stack pointer so we must apply the stack
1086 correction offset. */
1087 write_register (HARD_D_REGNUM, addr + STACK_CORRECTION);
1091 m68hc11_store_return_value (struct type *type, struct regcache *regcache,
1096 len = TYPE_LENGTH (type);
1098 /* First argument is passed in D and X registers. */
1100 regcache_raw_write_part (regcache, HARD_D_REGNUM, 2 - len, len, valbuf);
1103 regcache_raw_write_part (regcache, HARD_X_REGNUM, 4 - len,
1105 regcache_raw_write (regcache, HARD_D_REGNUM, (char*) valbuf + (len - 2));
1108 error ("return of value > 4 is not supported.");
1112 /* Given a return value in `regcache' with a type `type',
1113 extract and copy its value into `valbuf'. */
1116 m68hc11_extract_return_value (struct type *type, struct regcache *regcache,
1119 int len = TYPE_LENGTH (type);
1120 char buf[M68HC11_REG_SIZE];
1122 regcache_raw_read (regcache, HARD_D_REGNUM, buf);
1126 memcpy (valbuf, buf + 1, 1);
1130 memcpy (valbuf, buf, 2);
1134 memcpy ((char*) valbuf + 1, buf, 2);
1135 regcache_raw_read (regcache, HARD_X_REGNUM, buf);
1136 memcpy (valbuf, buf + 1, 1);
1140 memcpy ((char*) valbuf + 2, buf, 2);
1141 regcache_raw_read (regcache, HARD_X_REGNUM, buf);
1142 memcpy (valbuf, buf, 2);
1146 error ("bad size for return value");
1150 /* Should call_function allocate stack space for a struct return? */
1152 m68hc11_use_struct_convention (int gcc_p, struct type *type)
1154 return (TYPE_CODE (type) == TYPE_CODE_STRUCT
1155 || TYPE_CODE (type) == TYPE_CODE_UNION
1156 || TYPE_LENGTH (type) > 4);
1160 m68hc11_return_value_on_stack (struct type *type)
1162 return TYPE_LENGTH (type) > 4;
1165 /* Extract from an array REGBUF containing the (raw) register state
1166 the address in which a function should return its structure value,
1167 as a CORE_ADDR (or an expression that can be used as one). */
1169 m68hc11_extract_struct_value_address (struct regcache *regcache)
1171 char buf[M68HC11_REG_SIZE];
1173 regcache_cooked_read (regcache, HARD_D_REGNUM, buf);
1174 return extract_unsigned_integer (buf, M68HC11_REG_SIZE);
1177 /* Function: push_return_address (pc)
1178 Set up the return address for the inferior function call.
1179 Needed for targets where we don't actually execute a JSR/BSR instruction */
1182 m68hc11_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
1186 pc = CALL_DUMMY_ADDRESS ();
1188 store_unsigned_integer (valbuf, 2, pc);
1189 write_memory (sp + STACK_CORRECTION, valbuf, 2);
1193 /* Test whether the ELF symbol corresponds to a function using rtc or
1197 m68hc11_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
1199 unsigned char flags;
1201 flags = ((elf_symbol_type *)sym)->internal_elf_sym.st_other;
1202 if (flags & STO_M68HC12_FAR)
1203 MSYMBOL_SET_RTC (msym);
1204 if (flags & STO_M68HC12_INTERRUPT)
1205 MSYMBOL_SET_RTI (msym);
1209 gdb_print_insn_m68hc11 (bfd_vma memaddr, disassemble_info *info)
1211 if (TARGET_ARCHITECTURE->arch == bfd_arch_m68hc11)
1212 return print_insn_m68hc11 (memaddr, info);
1214 return print_insn_m68hc12 (memaddr, info);
1219 /* 68HC11/68HC12 register groups.
1220 Identify real hard registers and soft registers used by gcc. */
1222 static struct reggroup *m68hc11_soft_reggroup;
1223 static struct reggroup *m68hc11_hard_reggroup;
1226 m68hc11_init_reggroups (void)
1228 m68hc11_hard_reggroup = reggroup_new ("hard", USER_REGGROUP);
1229 m68hc11_soft_reggroup = reggroup_new ("soft", USER_REGGROUP);
1233 m68hc11_add_reggroups (struct gdbarch *gdbarch)
1235 reggroup_add (gdbarch, m68hc11_hard_reggroup);
1236 reggroup_add (gdbarch, m68hc11_soft_reggroup);
1237 reggroup_add (gdbarch, general_reggroup);
1238 reggroup_add (gdbarch, float_reggroup);
1239 reggroup_add (gdbarch, all_reggroup);
1240 reggroup_add (gdbarch, save_reggroup);
1241 reggroup_add (gdbarch, restore_reggroup);
1242 reggroup_add (gdbarch, vector_reggroup);
1243 reggroup_add (gdbarch, system_reggroup);
1247 m68hc11_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
1248 struct reggroup *group)
1250 /* We must save the real hard register as well as gcc
1251 soft registers including the frame pointer. */
1252 if (group == save_reggroup || group == restore_reggroup)
1254 return (regnum <= gdbarch_num_regs (gdbarch)
1255 || ((regnum == SOFT_FP_REGNUM
1256 || regnum == SOFT_TMP_REGNUM
1257 || regnum == SOFT_ZS_REGNUM
1258 || regnum == SOFT_XY_REGNUM)
1259 && m68hc11_register_name (regnum)));
1262 /* Group to identify gcc soft registers (d1..dN). */
1263 if (group == m68hc11_soft_reggroup)
1265 return regnum >= SOFT_D1_REGNUM && m68hc11_register_name (regnum);
1268 if (group == m68hc11_hard_reggroup)
1270 return regnum == HARD_PC_REGNUM || regnum == HARD_SP_REGNUM
1271 || regnum == HARD_X_REGNUM || regnum == HARD_D_REGNUM
1272 || regnum == HARD_Y_REGNUM || regnum == HARD_CCR_REGNUM;
1274 return default_register_reggroup_p (gdbarch, regnum, group);
1277 static struct gdbarch *
1278 m68hc11_gdbarch_init (struct gdbarch_info info,
1279 struct gdbarch_list *arches)
1281 static LONGEST m68hc11_call_dummy_words[] =
1283 struct gdbarch *gdbarch;
1284 struct gdbarch_tdep *tdep;
1287 soft_reg_initialized = 0;
1289 /* Extract the elf_flags if available. */
1290 if (info.abfd != NULL
1291 && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
1292 elf_flags = elf_elfheader (info.abfd)->e_flags;
1296 /* try to find a pre-existing architecture */
1297 for (arches = gdbarch_list_lookup_by_info (arches, &info);
1299 arches = gdbarch_list_lookup_by_info (arches->next, &info))
1301 if (gdbarch_tdep (arches->gdbarch)->elf_flags != elf_flags)
1304 return arches->gdbarch;
1307 /* Need a new architecture. Fill in a target specific vector. */
1308 tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
1309 gdbarch = gdbarch_alloc (&info, tdep);
1310 tdep->elf_flags = elf_flags;
1312 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
1313 ready to unwind the PC first (see frame.c:get_prev_frame()). */
1314 set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
1316 switch (info.bfd_arch_info->arch)
1318 case bfd_arch_m68hc11:
1319 tdep->stack_correction = 1;
1320 tdep->use_page_register = 0;
1321 tdep->prologue = m6811_prologue;
1322 set_gdbarch_addr_bit (gdbarch, 16);
1323 set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS);
1324 set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM);
1325 set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS);
1328 case bfd_arch_m68hc12:
1329 tdep->stack_correction = 0;
1330 tdep->use_page_register = elf_flags & E_M68HC12_BANKS;
1331 tdep->prologue = m6812_prologue;
1332 set_gdbarch_addr_bit (gdbarch, elf_flags & E_M68HC12_BANKS ? 32 : 16);
1333 set_gdbarch_num_pseudo_regs (gdbarch,
1334 elf_flags & E_M68HC12_BANKS
1335 ? M68HC12_NUM_PSEUDO_REGS
1336 : M68HC11_NUM_PSEUDO_REGS);
1337 set_gdbarch_pc_regnum (gdbarch, elf_flags & E_M68HC12_BANKS
1338 ? M68HC12_HARD_PC_REGNUM : HARD_PC_REGNUM);
1339 set_gdbarch_num_regs (gdbarch, elf_flags & E_M68HC12_BANKS
1340 ? M68HC12_NUM_REGS : M68HC11_NUM_REGS);
1347 /* Initially set everything according to the ABI.
1348 Use 16-bit integers since it will be the case for most
1349 programs. The size of these types should normally be set
1350 according to the dwarf2 debug information. */
1351 set_gdbarch_short_bit (gdbarch, 16);
1352 set_gdbarch_int_bit (gdbarch, elf_flags & E_M68HC11_I32 ? 32 : 16);
1353 set_gdbarch_float_bit (gdbarch, 32);
1354 set_gdbarch_double_bit (gdbarch, elf_flags & E_M68HC11_F64 ? 64 : 32);
1355 set_gdbarch_long_double_bit (gdbarch, 64);
1356 set_gdbarch_long_bit (gdbarch, 32);
1357 set_gdbarch_ptr_bit (gdbarch, 16);
1358 set_gdbarch_long_long_bit (gdbarch, 64);
1360 /* Characters are unsigned. */
1361 set_gdbarch_char_signed (gdbarch, 0);
1363 /* Set register info. */
1364 set_gdbarch_fp0_regnum (gdbarch, -1);
1365 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, m68hc11_frame_init_saved_regs);
1366 set_gdbarch_frame_args_skip (gdbarch, 0);
1368 set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
1369 set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
1371 set_gdbarch_sp_regnum (gdbarch, HARD_SP_REGNUM);
1372 set_gdbarch_deprecated_fp_regnum (gdbarch, SOFT_FP_REGNUM);
1373 set_gdbarch_register_name (gdbarch, m68hc11_register_name);
1374 set_gdbarch_register_type (gdbarch, m68hc11_register_type);
1375 set_gdbarch_pseudo_register_read (gdbarch, m68hc11_pseudo_register_read);
1376 set_gdbarch_pseudo_register_write (gdbarch, m68hc11_pseudo_register_write);
1378 set_gdbarch_deprecated_call_dummy_words (gdbarch, m68hc11_call_dummy_words);
1379 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (m68hc11_call_dummy_words));
1380 set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
1381 set_gdbarch_extract_return_value (gdbarch, m68hc11_extract_return_value);
1382 set_gdbarch_deprecated_push_arguments (gdbarch, m68hc11_push_arguments);
1383 set_gdbarch_deprecated_push_return_address (gdbarch, m68hc11_push_return_address);
1384 set_gdbarch_return_value_on_stack (gdbarch, m68hc11_return_value_on_stack);
1386 set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return);
1387 set_gdbarch_store_return_value (gdbarch, m68hc11_store_return_value);
1388 set_gdbarch_extract_struct_value_address (gdbarch, m68hc11_extract_struct_value_address);
1390 set_gdbarch_deprecated_frame_chain (gdbarch, m68hc11_frame_chain);
1391 set_gdbarch_deprecated_frame_saved_pc (gdbarch, m68hc11_frame_saved_pc);
1392 set_gdbarch_deprecated_frame_args_address (gdbarch, m68hc11_frame_args_address);
1393 set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68hc11_saved_pc_after_call);
1395 set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
1397 set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return);
1398 set_gdbarch_deprecated_store_return_value (gdbarch, m68hc11_store_return_value);
1399 set_gdbarch_deprecated_extract_struct_value_address
1400 (gdbarch, m68hc11_extract_struct_value_address);
1401 set_gdbarch_use_struct_convention (gdbarch, m68hc11_use_struct_convention);
1402 set_gdbarch_deprecated_init_extra_frame_info (gdbarch, m68hc11_init_extra_frame_info);
1403 set_gdbarch_deprecated_pop_frame (gdbarch, m68hc11_pop_frame);
1404 set_gdbarch_skip_prologue (gdbarch, m68hc11_skip_prologue);
1405 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1406 set_gdbarch_decr_pc_after_break (gdbarch, 0);
1407 set_gdbarch_function_start_offset (gdbarch, 0);
1408 set_gdbarch_breakpoint_from_pc (gdbarch, m68hc11_breakpoint_from_pc);
1409 set_gdbarch_stack_align (gdbarch, m68hc11_stack_align);
1410 set_gdbarch_deprecated_extra_stack_alignment_needed (gdbarch, 1);
1411 set_gdbarch_print_insn (gdbarch, gdb_print_insn_m68hc11);
1413 m68hc11_add_reggroups (gdbarch);
1414 set_gdbarch_register_reggroup_p (gdbarch, m68hc11_register_reggroup_p);
1416 /* Minsymbol frobbing. */
1417 set_gdbarch_elf_make_msymbol_special (gdbarch,
1418 m68hc11_elf_make_msymbol_special);
1420 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
1425 extern initialize_file_ftype _initialize_m68hc11_tdep; /* -Wmissing-prototypes */
1428 _initialize_m68hc11_tdep (void)
1430 register_gdbarch_init (bfd_arch_m68hc11, m68hc11_gdbarch_init);
1431 register_gdbarch_init (bfd_arch_m68hc12, m68hc11_gdbarch_init);
1432 m68hc11_init_reggroups ();
1434 add_com ("regs", class_vars, show_regs, "Print all registers");