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Diffstat (limited to 'gdb/m68hc11-tdep.c')
| -rw-r--r-- | gdb/m68hc11-tdep.c | 1170 |
1 files changed, 0 insertions, 1170 deletions
diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c deleted file mode 100644 index a636b34c0e8..00000000000 --- a/gdb/m68hc11-tdep.c +++ /dev/null @@ -1,1170 +0,0 @@ -/* Target-dependent code for Motorola 68HC11 & 68HC12 - Copyright 1999, 2000, 2001 Free Software Foundation, Inc. - Contributed by Stephane Carrez, stcarrez@worldnet.fr - -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 "frame.h" -#include "obstack.h" -#include "symtab.h" -#include "gdbtypes.h" -#include "gdbcmd.h" -#include "gdbcore.h" -#include "gdb_string.h" -#include "value.h" -#include "inferior.h" -#include "dis-asm.h" -#include "symfile.h" -#include "objfiles.h" -#include "arch-utils.h" -#include "regcache.h" - -#include "target.h" -#include "opcode/m68hc11.h" - -/* Register numbers of various important registers. - Note that some of these values are "real" register numbers, - and correspond to the general registers of the machine, - and some are "phony" register numbers which are too large - to be actual register numbers as far as the user is concerned - but do serve to get the desired values when passed to read_register. */ - -#define HARD_X_REGNUM 0 -#define HARD_D_REGNUM 1 -#define HARD_Y_REGNUM 2 -#define HARD_SP_REGNUM 3 -#define HARD_PC_REGNUM 4 - -#define HARD_A_REGNUM 5 -#define HARD_B_REGNUM 6 -#define HARD_CCR_REGNUM 7 -#define M68HC11_LAST_HARD_REG (HARD_CCR_REGNUM) - -/* Z is replaced by X or Y by gcc during machine reorg. - ??? There is no way to get it and even know whether - it's in X or Y or in ZS. */ -#define SOFT_Z_REGNUM 8 - -/* Soft registers. These registers are special. There are treated - like normal hard registers by gcc and gdb (ie, within dwarf2 info). - They are physically located in memory. */ -#define SOFT_FP_REGNUM 9 -#define SOFT_TMP_REGNUM 10 -#define SOFT_ZS_REGNUM 11 -#define SOFT_XY_REGNUM 12 -#define SOFT_UNUSED_REGNUM 13 -#define SOFT_D1_REGNUM 14 -#define SOFT_D32_REGNUM (SOFT_D1_REGNUM+31) -#define M68HC11_MAX_SOFT_REGS 32 - -#define M68HC11_NUM_REGS (8) -#define M68HC11_NUM_PSEUDO_REGS (M68HC11_MAX_SOFT_REGS+5) -#define M68HC11_ALL_REGS (M68HC11_NUM_REGS+M68HC11_NUM_PSEUDO_REGS) - -#define M68HC11_REG_SIZE (2) - -struct insn_sequence; -struct gdbarch_tdep - { - /* Stack pointer correction value. For 68hc11, the stack pointer points - to the next push location. An offset of 1 must be applied to obtain - the address where the last value is saved. For 68hc12, the stack - pointer points to the last value pushed. No offset is necessary. */ - int stack_correction; - - /* Description of instructions in the prologue. */ - struct insn_sequence *prologue; - }; - -#define M6811_TDEP gdbarch_tdep (current_gdbarch) -#define STACK_CORRECTION (M6811_TDEP->stack_correction) - -struct frame_extra_info -{ - int frame_reg; - CORE_ADDR return_pc; - CORE_ADDR dummy; - int frameless; - int size; -}; - -/* Table of registers for 68HC11. This includes the hard registers - and the soft registers used by GCC. */ -static char * -m68hc11_register_names[] = -{ - "x", "d", "y", "sp", "pc", "a", "b", - "ccr", "z", "frame","tmp", "zs", "xy", 0, - "d1", "d2", "d3", "d4", "d5", "d6", "d7", - "d8", "d9", "d10", "d11", "d12", "d13", "d14", - "d15", "d16", "d17", "d18", "d19", "d20", "d21", - "d22", "d23", "d24", "d25", "d26", "d27", "d28", - "d29", "d30", "d31", "d32" -}; - -struct m68hc11_soft_reg -{ - const char *name; - CORE_ADDR addr; -}; - -static struct m68hc11_soft_reg soft_regs[M68HC11_ALL_REGS]; - -#define M68HC11_FP_ADDR soft_regs[SOFT_FP_REGNUM].addr - -static int soft_min_addr; -static int soft_max_addr; -static int soft_reg_initialized = 0; - -/* Look in the symbol table for the address of a pseudo register - in memory. If we don't find it, pretend the register is not used - and not available. */ -static void -m68hc11_get_register_info (struct m68hc11_soft_reg *reg, const char *name) -{ - struct minimal_symbol *msymbol; - - msymbol = lookup_minimal_symbol (name, NULL, NULL); - if (msymbol) - { - reg->addr = SYMBOL_VALUE_ADDRESS (msymbol); - reg->name = xstrdup (name); - - /* Keep track of the address range for soft registers. */ - if (reg->addr < (CORE_ADDR) soft_min_addr) - soft_min_addr = reg->addr; - if (reg->addr > (CORE_ADDR) soft_max_addr) - soft_max_addr = reg->addr; - } - else - { - reg->name = 0; - reg->addr = 0; - } -} - -/* Initialize the table of soft register addresses according - to the symbol table. */ - static void -m68hc11_initialize_register_info (void) -{ - int i; - - if (soft_reg_initialized) - return; - - soft_min_addr = INT_MAX; - soft_max_addr = 0; - for (i = 0; i < M68HC11_ALL_REGS; i++) - { - soft_regs[i].name = 0; - } - - m68hc11_get_register_info (&soft_regs[SOFT_FP_REGNUM], "_.frame"); - m68hc11_get_register_info (&soft_regs[SOFT_TMP_REGNUM], "_.tmp"); - m68hc11_get_register_info (&soft_regs[SOFT_ZS_REGNUM], "_.z"); - soft_regs[SOFT_Z_REGNUM] = soft_regs[SOFT_ZS_REGNUM]; - m68hc11_get_register_info (&soft_regs[SOFT_XY_REGNUM], "_.xy"); - - for (i = SOFT_D1_REGNUM; i < M68HC11_MAX_SOFT_REGS; i++) - { - char buf[10]; - - sprintf (buf, "_.d%d", i - SOFT_D1_REGNUM + 1); - m68hc11_get_register_info (&soft_regs[i], buf); - } - - if (soft_regs[SOFT_FP_REGNUM].name == 0) - { - warning ("No frame soft register found in the symbol table.\n"); - warning ("Stack backtrace will not work.\n"); - } - soft_reg_initialized = 1; -} - -/* Given an address in memory, return the soft register number if - that address corresponds to a soft register. Returns -1 if not. */ -static int -m68hc11_which_soft_register (CORE_ADDR addr) -{ - int i; - - if (addr < soft_min_addr || addr > soft_max_addr) - return -1; - - for (i = SOFT_FP_REGNUM; i < M68HC11_ALL_REGS; i++) - { - if (soft_regs[i].name && soft_regs[i].addr == addr) - return i; - } - return -1; -} - -/* Fetch a pseudo register. The 68hc11 soft registers are treated like - pseudo registers. They are located in memory. Translate the register - fetch into a memory read. */ -void -m68hc11_fetch_pseudo_register (int regno) -{ - char buf[MAX_REGISTER_RAW_SIZE]; - - m68hc11_initialize_register_info (); - - /* Fetch a soft register: translate into a memory read. */ - if (soft_regs[regno].name) - { - target_read_memory (soft_regs[regno].addr, buf, 2); - } - else - { - memset (buf, 0, 2); - } - supply_register (regno, buf); -} - -/* Store a pseudo register. Translate the register store - into a memory write. */ -static void -m68hc11_store_pseudo_register (int regno) -{ - m68hc11_initialize_register_info (); - - /* Store a soft register: translate into a memory write. */ - if (soft_regs[regno].name) - { - char buf[MAX_REGISTER_RAW_SIZE]; - - read_register_gen (regno, buf); - target_write_memory (soft_regs[regno].addr, buf, 2); - } -} - -static char * -m68hc11_register_name (int reg_nr) -{ - if (reg_nr < 0) - return NULL; - if (reg_nr >= M68HC11_ALL_REGS) - return NULL; - - /* If we don't know the address of a soft register, pretend it - does not exist. */ - if (reg_nr > M68HC11_LAST_HARD_REG && soft_regs[reg_nr].name == 0) - return NULL; - return m68hc11_register_names[reg_nr]; -} - -static unsigned char * -m68hc11_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) -{ - static unsigned char breakpoint[] = {0x0}; - - *lenptr = sizeof (breakpoint); - return breakpoint; -} - -/* Immediately after a function call, return the saved pc before the frame - is setup. */ - -static CORE_ADDR -m68hc11_saved_pc_after_call (struct frame_info *frame) -{ - CORE_ADDR addr; - - addr = read_register (HARD_SP_REGNUM) + STACK_CORRECTION; - addr &= 0x0ffff; - return read_memory_integer (addr, 2) & 0x0FFFF; -} - -static CORE_ADDR -m68hc11_frame_saved_pc (struct frame_info *frame) -{ - return frame->extra_info->return_pc; -} - -static CORE_ADDR -m68hc11_frame_args_address (struct frame_info *frame) -{ - return frame->frame + frame->extra_info->size + STACK_CORRECTION + 2; -} - -static CORE_ADDR -m68hc11_frame_locals_address (struct frame_info *frame) -{ - return frame->frame; -} - -/* Discard from the stack the innermost frame, restoring all saved - registers. */ - -static void -m68hc11_pop_frame (void) -{ - register struct frame_info *frame = get_current_frame (); - register CORE_ADDR fp, sp; - register int regnum; - - if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) - generic_pop_dummy_frame (); - else - { - fp = FRAME_FP (frame); - FRAME_INIT_SAVED_REGS (frame); - - /* Copy regs from where they were saved in the frame. */ - for (regnum = 0; regnum < M68HC11_ALL_REGS; regnum++) - if (frame->saved_regs[regnum]) - write_register (regnum, - read_memory_integer (frame->saved_regs[regnum], 2)); - - write_register (HARD_PC_REGNUM, frame->extra_info->return_pc); - sp = fp + frame->extra_info->size; - write_register (HARD_SP_REGNUM, sp); - } - flush_cached_frames (); -} - - -/* 68HC11 & 68HC12 prologue analysis. - - */ -#define MAX_CODES 12 - -/* 68HC11 opcodes. */ -#undef M6811_OP_PAGE2 -#define M6811_OP_PAGE2 (0x18) -#define M6811_OP_LDX (0xde) -#define M6811_OP_PSHX (0x3c) -#define M6811_OP_STS (0x9f) -#define M6811_OP_TSX (0x30) -#define M6811_OP_XGDX (0x8f) -#define M6811_OP_ADDD (0xc3) -#define M6811_OP_TXS (0x35) -#define M6811_OP_DES (0x34) - -/* 68HC12 opcodes. */ -#define M6812_OP_PAGE2 (0x18) -#define M6812_OP_MOVW (0x01) -#define M6812_PB_PSHW (0xae) -#define M6812_OP_STS (0x7f) -#define M6812_OP_LEAS (0x1b) - -/* Operand extraction. */ -#define OP_DIRECT (0x100) /* 8-byte direct addressing. */ -#define OP_IMM_LOW (0x200) /* Low part of 16-bit constant/address. */ -#define OP_IMM_HIGH (0x300) /* High part of 16-bit constant/address. */ -#define OP_PBYTE (0x400) /* 68HC12 indexed operand. */ - -/* Identification of the sequence. */ -enum m6811_seq_type -{ - P_LAST = 0, - P_SAVE_REG, /* Save a register on the stack. */ - P_SET_FRAME, /* Setup the frame pointer. */ - P_LOCAL_1, /* Allocate 1 byte for locals. */ - P_LOCAL_2, /* Allocate 2 bytes for locals. */ - P_LOCAL_N /* Allocate N bytes for locals. */ -}; - -struct insn_sequence { - enum m6811_seq_type type; - unsigned length; - unsigned short code[MAX_CODES]; -}; - -/* Sequence of instructions in the 68HC11 function prologue. */ -static struct insn_sequence m6811_prologue[] = { - /* Sequences to save a soft-register. */ - { P_SAVE_REG, 3, { M6811_OP_LDX, OP_DIRECT, - M6811_OP_PSHX } }, - { P_SAVE_REG, 5, { M6811_OP_PAGE2, M6811_OP_LDX, OP_DIRECT, - M6811_OP_PAGE2, M6811_OP_PSHX } }, - - /* Sequences to allocate local variables. */ - { P_LOCAL_N, 7, { M6811_OP_TSX, - M6811_OP_XGDX, - M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW, - M6811_OP_XGDX, - M6811_OP_TXS } }, - { P_LOCAL_N, 11, { M6811_OP_PAGE2, M6811_OP_TSX, - M6811_OP_PAGE2, M6811_OP_XGDX, - M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW, - M6811_OP_PAGE2, M6811_OP_XGDX, - M6811_OP_PAGE2, M6811_OP_TXS } }, - { P_LOCAL_1, 1, { M6811_OP_DES } }, - { P_LOCAL_2, 1, { M6811_OP_PSHX } }, - { P_LOCAL_2, 2, { M6811_OP_PAGE2, M6811_OP_PSHX } }, - - /* Initialize the frame pointer. */ - { P_SET_FRAME, 2, { M6811_OP_STS, OP_DIRECT } }, - { P_LAST, 0, { 0 } } -}; - - -/* Sequence of instructions in the 68HC12 function prologue. */ -static struct insn_sequence m6812_prologue[] = { - { P_SAVE_REG, 5, { M6812_OP_PAGE2, M6812_OP_MOVW, M6812_PB_PSHW, - OP_IMM_HIGH, OP_IMM_LOW } }, - { P_SET_FRAME, 3, { M6812_OP_STS, OP_IMM_HIGH, OP_IMM_LOW } }, - { P_LOCAL_N, 2, { M6812_OP_LEAS, OP_PBYTE } }, - { P_LAST, 0 } -}; - - -/* Analyze the sequence of instructions starting at the given address. - Returns a pointer to the sequence when it is recognized and - the optional value (constant/address) associated with it. - Advance the pc for the next sequence. */ -static struct insn_sequence * -m68hc11_analyze_instruction (struct insn_sequence *seq, CORE_ADDR *pc, - CORE_ADDR *val) -{ - unsigned char buffer[MAX_CODES]; - unsigned bufsize; - unsigned j; - CORE_ADDR cur_val; - short v = 0; - - bufsize = 0; - for (; seq->type != P_LAST; seq++) - { - cur_val = 0; - for (j = 0; j < seq->length; j++) - { - if (bufsize < j + 1) - { - buffer[bufsize] = read_memory_unsigned_integer (*pc + bufsize, - 1); - bufsize++; - } - /* Continue while we match the opcode. */ - if (seq->code[j] == buffer[j]) - continue; - - if ((seq->code[j] & 0xf00) == 0) - break; - - /* Extract a sequence parameter (address or constant). */ - switch (seq->code[j]) - { - case OP_DIRECT: - cur_val = (CORE_ADDR) buffer[j]; - break; - - case OP_IMM_HIGH: - cur_val = cur_val & 0x0ff; - cur_val |= (buffer[j] << 8); - break; - - case OP_IMM_LOW: - cur_val &= 0x0ff00; - cur_val |= buffer[j]; - break; - - case OP_PBYTE: - if ((buffer[j] & 0xE0) == 0x80) - { - v = buffer[j] & 0x1f; - if (v & 0x10) - v |= 0xfff0; - } - else if ((buffer[j] & 0xfe) == 0xf0) - { - v = read_memory_unsigned_integer (*pc + j + 1, 1); - if (buffer[j] & 1) - v |= 0xff00; - } - else if (buffer[j] == 0xf2) - { - v = read_memory_unsigned_integer (*pc + j + 1, 2); - } - cur_val = v; - break; - } - } - - /* We have a full match. */ - if (j == seq->length) - { - *val = cur_val; - *pc = *pc + j; - return seq; - } - } - return 0; -} - -/* Analyze the function prologue to find some information - about the function: - - the PC of the first line (for m68hc11_skip_prologue) - - the offset of the previous frame saved address (from current frame) - - the soft registers which are pushed. */ -static void -m68hc11_guess_from_prologue (CORE_ADDR pc, CORE_ADDR fp, - CORE_ADDR *first_line, - int *frame_offset, CORE_ADDR *pushed_regs) -{ - CORE_ADDR save_addr; - CORE_ADDR func_end; - int size; - int found_frame_point; - int saved_reg; - CORE_ADDR first_pc; - int done = 0; - struct insn_sequence *seq_table; - - first_pc = get_pc_function_start (pc); - size = 0; - - m68hc11_initialize_register_info (); - if (first_pc == 0) - { - *frame_offset = 0; - *first_line = pc; - return; - } - - seq_table = gdbarch_tdep (current_gdbarch)->prologue; - - /* The 68hc11 stack is as follows: - - - | | - +-----------+ - | | - | args | - | | - +-----------+ - | PC-return | - +-----------+ - | Old frame | - +-----------+ - | | - | Locals | - | | - +-----------+ <--- current frame - | | - - With most processors (like 68K) the previous frame can be computed - easily because it is always at a fixed offset (see link/unlink). - That is, locals are accessed with negative offsets, arguments are - accessed with positive ones. Since 68hc11 only supports offsets - in the range [0..255], the frame is defined at the bottom of - locals (see picture). - - The purpose of the analysis made here is to find out the size - of locals in this function. An alternative to this is to use - DWARF2 info. This would be better but I don't know how to - access dwarf2 debug from this function. - - Walk from the function entry point to the point where we save - the frame. While walking instructions, compute the size of bytes - which are pushed. This gives us the index to access the previous - frame. - - We limit the search to 128 bytes so that the algorithm is bounded - in case of random and wrong code. We also stop and abort if - we find an instruction which is not supposed to appear in the - prologue (as generated by gcc 2.95, 2.96). - */ - pc = first_pc; - func_end = pc + 128; - found_frame_point = 0; - *frame_offset = 0; - save_addr = fp; - while (!done && pc + 2 < func_end) - { - struct insn_sequence *seq; - CORE_ADDR val; - - seq = m68hc11_analyze_instruction (seq_table, &pc, &val); - if (seq == 0) - break; - - if (seq->type == P_SAVE_REG) - { - if (found_frame_point) - { - saved_reg = m68hc11_which_soft_register (val); - if (saved_reg < 0) - break; - - save_addr -= 2; - if (pushed_regs) - pushed_regs[saved_reg] = save_addr; - } - else - { - size += 2; - } - } - else if (seq->type == P_SET_FRAME) - { - found_frame_point = 1; - *frame_offset = size; - } - else if (seq->type == P_LOCAL_1) - { - size += 1; - } - else if (seq->type == P_LOCAL_2) - { - size += 2; - } - else if (seq->type == P_LOCAL_N) - { - /* Stack pointer is decremented for the allocation. */ - if (val & 0x8000) - size -= (int) (val) | 0xffff0000; - else - size -= val; - } - } - *first_line = pc; -} - -static CORE_ADDR -m68hc11_skip_prologue (CORE_ADDR pc) -{ - CORE_ADDR func_addr, func_end; - struct symtab_and_line sal; - int frame_offset; - - /* If we have line debugging information, then the end of the - prologue should be the first assembly instruction of the - first source line. */ - if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) - { - sal = find_pc_line (func_addr, 0); - if (sal.end && sal.end < func_end) - return sal.end; - } - - m68hc11_guess_from_prologue (pc, 0, &pc, &frame_offset, 0); - return pc; -} - -/* Given a GDB frame, determine the address of the calling function's frame. - This will be used to create a new GDB frame struct, and then - INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. -*/ - -static CORE_ADDR -m68hc11_frame_chain (struct frame_info *frame) -{ - CORE_ADDR addr; - - if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) - return frame->frame; /* dummy frame same as caller's frame */ - - if (frame->extra_info->return_pc == 0 - || inside_entry_file (frame->extra_info->return_pc)) - return (CORE_ADDR) 0; - - if (frame->frame == 0) - { - return (CORE_ADDR) 0; - } - - addr = frame->frame + frame->extra_info->size + STACK_CORRECTION - 2; - addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF; - if (addr == 0) - { - return (CORE_ADDR) 0; - } - - return addr; -} - -/* Put here the code to store, into a struct frame_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 void -m68hc11_frame_init_saved_regs (struct frame_info *fi) -{ - CORE_ADDR pc; - CORE_ADDR addr; - - if (fi->saved_regs == NULL) - frame_saved_regs_zalloc (fi); - else - memset (fi->saved_regs, 0, sizeof (fi->saved_regs)); - - pc = fi->pc; - m68hc11_guess_from_prologue (pc, fi->frame, &pc, &fi->extra_info->size, - fi->saved_regs); - - addr = fi->frame + fi->extra_info->size + STACK_CORRECTION; - if (soft_regs[SOFT_FP_REGNUM].name) - fi->saved_regs[SOFT_FP_REGNUM] = addr - 2; - fi->saved_regs[HARD_SP_REGNUM] = addr; - fi->saved_regs[HARD_PC_REGNUM] = fi->saved_regs[HARD_SP_REGNUM]; -} - -static void -m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi) -{ - CORE_ADDR addr; - - fi->extra_info = (struct frame_extra_info *) - frame_obstack_alloc (sizeof (struct frame_extra_info)); - - if (fi->next) - fi->pc = FRAME_SAVED_PC (fi->next); - - m68hc11_frame_init_saved_regs (fi); - - if (fromleaf) - { - fi->extra_info->return_pc = m68hc11_saved_pc_after_call (fi); - } - else - { - addr = fi->frame + fi->extra_info->size + STACK_CORRECTION; - addr = read_memory_unsigned_integer (addr, 2) & 0x0ffff; - fi->extra_info->return_pc = addr; -#if 0 - printf ("Pc@0x%04x, FR 0x%04x, size %d, read ret @0x%04x -> 0x%04x\n", - fi->pc, - fi->frame, fi->size, - addr & 0x0ffff, - fi->return_pc); -#endif - } -} - -/* Same as 'info reg' but prints the registers in a different way. */ -static void -show_regs (char *args, int from_tty) -{ - int ccr = read_register (HARD_CCR_REGNUM); - int i; - int nr; - - printf_filtered ("PC=%04x SP=%04x FP=%04x CCR=%02x %c%c%c%c%c%c%c%c\n", - (int) read_register (HARD_PC_REGNUM), - (int) read_register (HARD_SP_REGNUM), - (int) read_register (SOFT_FP_REGNUM), - ccr, - ccr & M6811_S_BIT ? 'S' : '-', - ccr & M6811_X_BIT ? 'X' : '-', - ccr & M6811_H_BIT ? 'H' : '-', - ccr & M6811_I_BIT ? 'I' : '-', - ccr & M6811_N_BIT ? 'N' : '-', - ccr & M6811_Z_BIT ? 'Z' : '-', - ccr & M6811_V_BIT ? 'V' : '-', - ccr & M6811_C_BIT ? 'C' : '-'); - - printf_filtered ("D=%04x IX=%04x IY=%04x\n", - (int) read_register (HARD_D_REGNUM), - (int) read_register (HARD_X_REGNUM), - (int) read_register (HARD_Y_REGNUM)); - - nr = 0; - for (i = SOFT_D1_REGNUM; i < M68HC11_ALL_REGS; i++) - { - /* Skip registers which are not defined in the symbol table. */ - if (soft_regs[i].name == 0) - continue; - - printf_filtered ("D%d=%04x", - i - SOFT_D1_REGNUM + 1, - (int) read_register (i)); - nr++; - if ((nr % 8) == 7) - printf_filtered ("\n"); - else - printf_filtered (" "); - } - if (nr && (nr % 8) != 7) - printf_filtered ("\n"); -} - -static CORE_ADDR -m68hc11_stack_align (CORE_ADDR addr) -{ - return ((addr + 1) & -2); -} - -static CORE_ADDR -m68hc11_push_arguments (int nargs, - value_ptr *args, - CORE_ADDR sp, - int struct_return, - CORE_ADDR struct_addr) -{ - int stack_alloc; - int argnum; - int first_stack_argnum; - int stack_offset; - struct type *type; - char *val; - int len; - - stack_alloc = 0; - first_stack_argnum = 0; - if (struct_return) - { - /* The struct is allocated on the stack and gdb used the stack - pointer for the address of that struct. We must apply the - stack offset on the address. */ - write_register (HARD_D_REGNUM, struct_addr + STACK_CORRECTION); - } - else if (nargs > 0) - { - type = VALUE_TYPE (args[0]); - len = TYPE_LENGTH (type); - - /* First argument is passed in D and X registers. */ - if (len <= 4) - { - LONGEST v = extract_unsigned_integer (VALUE_CONTENTS (args[0]), len); - first_stack_argnum = 1; - write_register (HARD_D_REGNUM, v); - if (len > 2) - { - v >>= 16; - write_register (HARD_X_REGNUM, v); - } - } - } - for (argnum = first_stack_argnum; argnum < nargs; argnum++) - { - type = VALUE_TYPE (args[argnum]); - stack_alloc += (TYPE_LENGTH (type) + 1) & -2; - } - sp -= stack_alloc; - - stack_offset = STACK_CORRECTION; - for (argnum = first_stack_argnum; argnum < nargs; argnum++) - { - type = VALUE_TYPE (args[argnum]); - len = TYPE_LENGTH (type); - - val = (char*) VALUE_CONTENTS (args[argnum]); - write_memory (sp + stack_offset, val, len); - stack_offset += len; - if (len & 1) - { - static char zero = 0; - - write_memory (sp + stack_offset, &zero, 1); - stack_offset++; - } - } - return sp; -} - - -/* Return a location where we can set a breakpoint that will be hit - when an inferior function call returns. */ -CORE_ADDR -m68hc11_call_dummy_address (void) -{ - return entry_point_address (); -} - -static struct type * -m68hc11_register_virtual_type (int reg_nr) -{ - return builtin_type_uint16; -} - -static void -m68hc11_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) -{ - /* The struct address computed by gdb is on the stack. - It uses the stack pointer so we must apply the stack - correction offset. */ - write_register (HARD_D_REGNUM, addr + STACK_CORRECTION); -} - -static void -m68hc11_store_return_value (struct type *type, char *valbuf) -{ - int len; - - len = TYPE_LENGTH (type); - - /* First argument is passed in D and X registers. */ - if (len <= 4) - { - LONGEST v = extract_unsigned_integer (valbuf, len); - - write_register (HARD_D_REGNUM, v); - if (len > 2) - { - v >>= 16; - write_register (HARD_X_REGNUM, v); - } - } - else - error ("return of value > 4 is not supported."); -} - - -/* Given a return value in `regbuf' with a type `type', - extract and copy its value into `valbuf'. */ - -static void -m68hc11_extract_return_value (struct type *type, - char *regbuf, - char *valbuf) -{ - int len = TYPE_LENGTH (type); - - switch (len) - { - case 1: - memcpy (valbuf, ®buf[HARD_D_REGNUM * 2 + 1], len); - break; - - case 2: - memcpy (valbuf, ®buf[HARD_D_REGNUM * 2], len); - break; - - case 3: - memcpy (&valbuf[0], ®buf[HARD_X_REGNUM * 2 + 1], 1); - memcpy (&valbuf[1], ®buf[HARD_D_REGNUM * 2], 2); - break; - - case 4: - memcpy (&valbuf[0], ®buf[HARD_X_REGNUM * 2], 2); - memcpy (&valbuf[2], ®buf[HARD_D_REGNUM * 2], 2); - break; - - default: - error ("bad size for return value"); - } -} - -/* Should call_function allocate stack space for a struct return? */ -static int -m68hc11_use_struct_convention (int gcc_p, struct type *type) -{ - return (TYPE_CODE (type) == TYPE_CODE_STRUCT - || TYPE_CODE (type) == TYPE_CODE_UNION - || TYPE_LENGTH (type) > 4); -} - -static int -m68hc11_return_value_on_stack (struct type *type) -{ - return TYPE_LENGTH (type) > 4; -} - -/* Extract from an array REGBUF containing the (raw) register state - the address in which a function should return its structure value, - as a CORE_ADDR (or an expression that can be used as one). */ -static CORE_ADDR -m68hc11_extract_struct_value_address (char *regbuf) -{ - return extract_address (®buf[HARD_D_REGNUM * 2], - REGISTER_RAW_SIZE (HARD_D_REGNUM)); -} - -/* Function: push_return_address (pc) - Set up the return address for the inferior function call. - Needed for targets where we don't actually execute a JSR/BSR instruction */ - -static CORE_ADDR -m68hc11_push_return_address (CORE_ADDR pc, CORE_ADDR sp) -{ - char valbuf[2]; - - pc = CALL_DUMMY_ADDRESS (); - sp -= 2; - store_unsigned_integer (valbuf, 2, pc); - write_memory (sp + STACK_CORRECTION, valbuf, 2); - return sp; -} - -/* Index within `registers' of the first byte of the space for - register N. */ -static int -m68hc11_register_byte (int reg_nr) -{ - return (reg_nr * M68HC11_REG_SIZE); -} - -static int -m68hc11_register_raw_size (int reg_nr) -{ - return M68HC11_REG_SIZE; -} - -static int -gdb_print_insn_m68hc11 (bfd_vma memaddr, disassemble_info *info) -{ - if (TARGET_ARCHITECTURE->arch == bfd_arch_m68hc11) - return print_insn_m68hc11 (memaddr, info); - else - return print_insn_m68hc12 (memaddr, info); -} - -static struct gdbarch * -m68hc11_gdbarch_init (struct gdbarch_info info, - struct gdbarch_list *arches) -{ - static LONGEST m68hc11_call_dummy_words[] = - {0}; - struct gdbarch *gdbarch; - struct gdbarch_tdep *tdep; - - soft_reg_initialized = 0; - - /* try to find a pre-existing architecture */ - for (arches = gdbarch_list_lookup_by_info (arches, &info); - arches != NULL; - arches = gdbarch_list_lookup_by_info (arches->next, &info)) - { - return arches->gdbarch; - } - - /* Need a new architecture. Fill in a target specific vector. */ - tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); - gdbarch = gdbarch_alloc (&info, tdep); - - switch (info.bfd_arch_info->arch) - { - case bfd_arch_m68hc11: - tdep->stack_correction = 1; - tdep->prologue = m6811_prologue; - break; - - case bfd_arch_m68hc12: - tdep->stack_correction = 0; - tdep->prologue = m6812_prologue; - break; - - default: - break; - } - - /* Initially set everything according to the ABI. */ - set_gdbarch_short_bit (gdbarch, 16); - set_gdbarch_int_bit (gdbarch, 32); - set_gdbarch_float_bit (gdbarch, 32); - set_gdbarch_double_bit (gdbarch, 64); - set_gdbarch_long_double_bit (gdbarch, 64); - set_gdbarch_long_bit (gdbarch, 32); - set_gdbarch_ptr_bit (gdbarch, 16); - set_gdbarch_long_long_bit (gdbarch, 64); - - /* Set register info. */ - set_gdbarch_fp0_regnum (gdbarch, -1); - set_gdbarch_max_register_raw_size (gdbarch, 2); - set_gdbarch_max_register_virtual_size (gdbarch, 2); - set_gdbarch_register_raw_size (gdbarch, m68hc11_register_raw_size); - set_gdbarch_register_virtual_size (gdbarch, m68hc11_register_raw_size); - set_gdbarch_register_byte (gdbarch, m68hc11_register_byte); - set_gdbarch_frame_init_saved_regs (gdbarch, m68hc11_frame_init_saved_regs); - set_gdbarch_frame_args_skip (gdbarch, 0); - - set_gdbarch_read_pc (gdbarch, generic_target_read_pc); - set_gdbarch_write_pc (gdbarch, generic_target_write_pc); - set_gdbarch_read_fp (gdbarch, generic_target_read_fp); - set_gdbarch_write_fp (gdbarch, generic_target_write_fp); - set_gdbarch_read_sp (gdbarch, generic_target_read_sp); - set_gdbarch_write_sp (gdbarch, generic_target_write_sp); - - set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS); - set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS); - set_gdbarch_sp_regnum (gdbarch, HARD_SP_REGNUM); - set_gdbarch_fp_regnum (gdbarch, SOFT_FP_REGNUM); - set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM); - set_gdbarch_register_name (gdbarch, m68hc11_register_name); - set_gdbarch_register_size (gdbarch, 2); - set_gdbarch_register_bytes (gdbarch, M68HC11_ALL_REGS * 2); - set_gdbarch_register_virtual_type (gdbarch, m68hc11_register_virtual_type); - set_gdbarch_fetch_pseudo_register (gdbarch, m68hc11_fetch_pseudo_register); - set_gdbarch_store_pseudo_register (gdbarch, m68hc11_store_pseudo_register); - - set_gdbarch_use_generic_dummy_frames (gdbarch, 1); - set_gdbarch_call_dummy_length (gdbarch, 0); - set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); - set_gdbarch_call_dummy_address (gdbarch, m68hc11_call_dummy_address); - set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); /*???*/ - set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); - set_gdbarch_call_dummy_start_offset (gdbarch, 0); - set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy); - set_gdbarch_call_dummy_words (gdbarch, m68hc11_call_dummy_words); - set_gdbarch_sizeof_call_dummy_words (gdbarch, - sizeof (m68hc11_call_dummy_words)); - set_gdbarch_call_dummy_p (gdbarch, 1); - set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); - set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); - set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); - set_gdbarch_extract_return_value (gdbarch, m68hc11_extract_return_value); - set_gdbarch_push_arguments (gdbarch, m68hc11_push_arguments); - set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); - set_gdbarch_push_return_address (gdbarch, m68hc11_push_return_address); - set_gdbarch_return_value_on_stack (gdbarch, m68hc11_return_value_on_stack); - - set_gdbarch_store_struct_return (gdbarch, m68hc11_store_struct_return); - set_gdbarch_store_return_value (gdbarch, m68hc11_store_return_value); - set_gdbarch_extract_struct_value_address (gdbarch, - m68hc11_extract_struct_value_address); - set_gdbarch_register_convertible (gdbarch, generic_register_convertible_not); - - - set_gdbarch_frame_chain (gdbarch, m68hc11_frame_chain); - set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); - set_gdbarch_frame_saved_pc (gdbarch, m68hc11_frame_saved_pc); - set_gdbarch_frame_args_address (gdbarch, m68hc11_frame_args_address); - set_gdbarch_frame_locals_address (gdbarch, m68hc11_frame_locals_address); - set_gdbarch_saved_pc_after_call (gdbarch, m68hc11_saved_pc_after_call); - set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); - - set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid); - set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); - - set_gdbarch_store_struct_return (gdbarch, m68hc11_store_struct_return); - set_gdbarch_store_return_value (gdbarch, m68hc11_store_return_value); - set_gdbarch_extract_struct_value_address - (gdbarch, m68hc11_extract_struct_value_address); - set_gdbarch_use_struct_convention (gdbarch, m68hc11_use_struct_convention); - set_gdbarch_init_extra_frame_info (gdbarch, m68hc11_init_extra_frame_info); - set_gdbarch_pop_frame (gdbarch, m68hc11_pop_frame); - set_gdbarch_skip_prologue (gdbarch, m68hc11_skip_prologue); - set_gdbarch_inner_than (gdbarch, core_addr_lessthan); - set_gdbarch_decr_pc_after_break (gdbarch, 0); - set_gdbarch_function_start_offset (gdbarch, 0); - set_gdbarch_breakpoint_from_pc (gdbarch, m68hc11_breakpoint_from_pc); - set_gdbarch_stack_align (gdbarch, m68hc11_stack_align); - - set_gdbarch_believe_pcc_promotion (gdbarch, 1); - set_gdbarch_ieee_float (gdbarch, 1); - - return gdbarch; -} - -void -_initialize_m68hc11_tdep (void) -{ - register_gdbarch_init (bfd_arch_m68hc11, m68hc11_gdbarch_init); - register_gdbarch_init (bfd_arch_m68hc12, m68hc11_gdbarch_init); - if (!tm_print_insn) /* Someone may have already set it */ - tm_print_insn = gdb_print_insn_m68hc11; - - add_com ("regs", class_vars, show_regs, "Print all registers"); -} - |