X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fm68hc11-tdep.c;h=8b69c1113ff4c330ea0336fb1e0504453f58ac9e;hb=0ba6dca974b6df1fc1ac67608815cf5a2603856d;hp=4c2d50511fd44a15d2da0c081448ff7e388d61e5;hpb=fba45db2faf619e71856ee38ec63949c0ef6903e;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c index 4c2d50511f..8b69c1113f 100644 --- a/gdb/m68hc11-tdep.c +++ b/gdb/m68hc11-tdep.c @@ -1,6 +1,6 @@ -/* Target-dependent code for Motorola 68HC11 - Copyright (C) 1999, 2000 Free Software Foundation, Inc. - Contributed by Stephane Carrez, stcarrez@worldnet.fr +/* Target-dependent code for Motorola 68HC11 & 68HC12 + Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. + Contributed by Stephane Carrez, stcarrez@nerim.fr This file is part of GDB. @@ -18,52 +18,69 @@ 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. */ -#if 0 -/* FIXME: This is from tm-m68hc1.h */ -#define GDB_TARGET_IS_M6811 - -/* Define the bit, byte, and word ordering of the machine. */ - -#define TARGET_BYTE_ORDER BIG_ENDIAN - -/* Offset from address of function to start of its code. - Zero on most machines. */ - -#define FUNCTION_START_OFFSET 0 - -#ifdef __STDC__ /* Forward decls for prototypes */ -struct frame_info; -struct frame_saved_regs; -struct type; -struct value; -#endif - -/* Advance PC across any function entry prologue instructions - to reach some "real" code. */ - -extern CORE_ADDR m68hc11_skip_prologue (); -#define SKIP_PROLOGUE(ip) \ - m68hc11_skip_prologue (ip) - - -/* Stack grows downward. */ - -#define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) - -/* For a breakpoint, use "test". This is also the breakpoint - instruction on the 68HC12. */ -#define BREAKPOINT {0x0} - -/* If your kernel resets the pc after the trap happens you may need to - define this before including this file. */ -#define DECR_PC_AFTER_BREAK 0 - -extern char *m68hc11_register_names[]; -#define REGISTER_NAME(i) m68hc11_register_names[i] +#include "defs.h" +#include "frame.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 "reggroups.h" -#define REGISTER_SIZE 2 +#include "target.h" +#include "opcode/m68hc11.h" +#include "elf/m68hc11.h" +#include "elf-bfd.h" + +/* Macros for setting and testing a bit in a minimal symbol. + For 68HC11/68HC12 we have two flags that tell which return + type the function is using. This is used for prologue and frame + analysis to compute correct stack frame layout. + + The MSB of the minimal symbol's "info" field is used for this purpose. + This field is already being used to store the symbol size, so the + assumption is that the symbol size cannot exceed 2^30. + + MSYMBOL_SET_RTC Actually sets the "RTC" bit. + MSYMBOL_SET_RTI Actually sets the "RTI" bit. + MSYMBOL_IS_RTC Tests the "RTC" bit in a minimal symbol. + MSYMBOL_IS_RTI Tests the "RTC" bit in a minimal symbol. + MSYMBOL_SIZE Returns the size of the minimal symbol, + i.e. the "info" field with the "special" bit + masked out. */ + +#define MSYMBOL_SET_RTC(msym) \ + MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \ + | 0x80000000) + +#define MSYMBOL_SET_RTI(msym) \ + MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \ + | 0x40000000) + +#define MSYMBOL_IS_RTC(msym) \ + (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0) + +#define MSYMBOL_IS_RTI(msym) \ + (((long) MSYMBOL_INFO (msym) & 0x40000000) != 0) + +#define MSYMBOL_SIZE(msym) \ + ((long) MSYMBOL_INFO (msym) & 0x3fffffff) + +enum insn_return_kind { + RETURN_RTS, + RETURN_RTC, + RETURN_RTI +}; + /* 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, @@ -71,307 +88,614 @@ extern char *m68hc11_register_names[]; 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 X_REGNUM 0 -#define D_REGNUM 1 -#define Y_REGNUM 2 -#define SP_REGNUM 3 -#define PC_REGNUM 4 -#define A_REGNUM 5 -#define B_REGNUM 6 -#define PSW_REGNUM 7 -#define Z_REGNUM 8 -#define FP_REGNUM 9 -#define TMP_REGNUM 10 -#define ZS_REGNUM 11 -#define XY_REGNUM 12 -#define ZD1_REGNUM 13 -#define ZD32_REGNUM (ZD1_REGNUM+31) - -#define NUM_REGS (ZD32_REGNUM+1) - -#include "opcode/m68hc11.h" - -/* Say how much memory is needed to store a copy of the register set */ -#define REGISTER_BYTES ((NUM_REGS)*2) - -/* Index within `registers' of the first byte of the space for - register N. */ - -#define REGISTER_BYTE(N) ((N) * 2) - -/* Number of bytes of storage in the actual machine representation - for register N. */ - -#define REGISTER_RAW_SIZE(N) (2) - -/* Number of bytes of storage in the program's representation - for register N. */ - -#define REGISTER_VIRTUAL_SIZE(N) (2) - -/* Largest value REGISTER_RAW_SIZE can have. */ - -#define MAX_REGISTER_RAW_SIZE 8 - -/* Largest value REGISTER_VIRTUAL_SIZE can have. */ - -#define MAX_REGISTER_VIRTUAL_SIZE 8 - -/* Return the GDB type object for the "standard" data type - of data in register N. */ - -#define REGISTER_VIRTUAL_TYPE(N) builtin_type_uint16 - -/* Store the address of the place in which to copy the structure the - subroutine will return. This is called from call_function. - - We store structs through a pointer passed in D */ - -#define STORE_STRUCT_RETURN(ADDR, SP) \ - { write_register (D_REGNUM, (ADDR)); } - - -/* Write into appropriate registers a function return value - of type TYPE, given in virtual format. - - Things always get returned in D/X */ - -#define STORE_RETURN_VALUE(TYPE,VALBUF) \ - write_register_bytes (REGISTER_BYTE (D_REGNUM), VALBUF, TYPE_LENGTH (TYPE)) - - -/* 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). */ - -#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) - - -/* Define other aspects of the stack frame. - we keep a copy of the worked out return pc lying around, since it - is a useful bit of info */ - -#define EXTRA_FRAME_INFO \ - int frame_reg; \ - CORE_ADDR return_pc; \ - CORE_ADDR dummy; \ - int frameless; \ - int size; - -/* There's a mess in stack frame creation. See comments in blockframe.c - near reference to INIT_FRAME_PC_FIRST. */ +#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 + +/* 68HC12 page number register. + Note: to keep a compatibility with gcc register naming, we must + not have to rename FP and other soft registers. The page register + is a real hard register and must therefore be counted by NUM_REGS. + For this it has the same number as Z register (which is not used). */ +#define HARD_PAGE_REGNUM 8 +#define M68HC11_LAST_HARD_REG (HARD_PAGE_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) + +#define M68HC12_NUM_REGS (9) +#define M68HC12_NUM_PSEUDO_REGS ((M68HC11_MAX_SOFT_REGS+5)+1-1) +#define M68HC12_HARD_PC_REGNUM (SOFT_D32_REGNUM+1) + +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; + + /* True if the page memory bank register is available + and must be used. */ + int use_page_register; + + /* ELF flags for ABI. */ + int elf_flags; + }; + +#define M6811_TDEP gdbarch_tdep (current_gdbarch) +#define STACK_CORRECTION (M6811_TDEP->stack_correction) +#define USE_PAGE_REGISTER (M6811_TDEP->use_page_register) + +struct frame_extra_info +{ + CORE_ADDR return_pc; + int frameless; + int size; + enum insn_return_kind return_kind; +}; -#define INIT_FRAME_PC(fromleaf, prev) /* nada */ +/* 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", "page", "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" +}; -#define INIT_FRAME_PC_FIRST(fromleaf, prev) \ - (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \ - (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ()); +struct m68hc11_soft_reg +{ + const char *name; + CORE_ADDR addr; +}; -#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ - m68hc11_init_extra_frame_info (fromleaf, fi) +static struct m68hc11_soft_reg soft_regs[M68HC11_ALL_REGS]; -extern void m68hc11_init_extra_frame_info (int fromleaf, - struct frame_info * fi); +#define M68HC11_FP_ADDR soft_regs[SOFT_FP_REGNUM].addr -/* A macro that tells us whether the function invocation represented - by FI does not have a frame on the stack associated with it. If it - does not, FRAMELESS is set to 1, else 0. */ +static int soft_min_addr; +static int soft_max_addr; +static int soft_reg_initialized = 0; -#define FRAMELESS_FUNCTION_INVOCATION(FI) \ - frameless_look_for_prologue (FI) +/* 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; -#define FRAME_CHAIN(FRAME) m68hc11_frame_chain (FRAME) -#define FRAME_CHAIN_VALID(chain,frame) \ - ((chain) != 0 && (frame) != 0) -#define FRAME_SAVED_PC(FRAME) ((FRAME)->return_pc) -#define FRAME_ARGS_ADDRESS(fi) (fi)->frame -#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame + 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; + } +} -#define SAVED_PC_AFTER_CALL(frame) m68hc11_saved_pc_after_call (frame) +/* Initialize the table of soft register addresses according + to the symbol table. */ + static void +m68hc11_initialize_register_info (void) +{ + int i; -/* Set VAL to the number of args passed to frame described by FI. - Can set VAL to -1, meaning no way to tell. */ -/* We can't tell how many args there are */ + 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"); -#define FRAME_NUM_ARGS(fi) (-1) + for (i = SOFT_D1_REGNUM; i < M68HC11_MAX_SOFT_REGS; i++) + { + char buf[10]; -/* Return number of bytes at start of arglist that are not really args. */ + sprintf (buf, "_.d%d", i - SOFT_D1_REGNUM + 1); + m68hc11_get_register_info (&soft_regs[i], buf); + } -#define FRAME_ARGS_SKIP 0 + 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; +} -/* 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. */ +/* 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. */ +static void +m68hc11_pseudo_register_read (struct gdbarch *gdbarch, + struct regcache *regcache, + int regno, void *buf) +{ + /* The PC is a pseudo reg only for 68HC12 with the memory bank + addressing mode. */ + if (regno == M68HC12_HARD_PC_REGNUM) + { + const int regsize = TYPE_LENGTH (builtin_type_uint32); + CORE_ADDR pc = read_register (HARD_PC_REGNUM); + int page = read_register (HARD_PAGE_REGNUM); -#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ - m68hc11_frame_find_saved_regs (frame_info, &(frame_saved_regs)) + if (pc >= 0x8000 && pc < 0xc000) + { + pc -= 0x8000; + pc += (page << 14); + pc += 0x1000000; + } + store_unsigned_integer (buf, regsize, pc); + return; + } -extern void m68hc11_frame_find_saved_regs (struct frame_info *, - struct frame_saved_regs *); + 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); + } +} -#define CALL_DUMMY { 0 } -#define PUSH_DUMMY_FRAME -#define CALL_DUMMY_START_OFFSET 0 -#define CALL_DUMMY_BREAKPOINT_OFFSET (0) +/* Store a pseudo register. Translate the register store + into a memory write. */ +static void +m68hc11_pseudo_register_write (struct gdbarch *gdbarch, + struct regcache *regcache, + int regno, const void *buf) +{ + /* The PC is a pseudo reg only for 68HC12 with the memory bank + addressing mode. */ + if (regno == M68HC12_HARD_PC_REGNUM) + { + const int regsize = TYPE_LENGTH (builtin_type_uint32); + char *tmp = alloca (regsize); + CORE_ADDR pc; -extern CORE_ADDR m68hc11_call_dummy_address (void); -#define CALL_DUMMY_ADDRESS() m68hc11_call_dummy_address () + memcpy (tmp, buf, regsize); + pc = extract_unsigned_integer (tmp, regsize); + if (pc >= 0x1000000) + { + pc -= 0x1000000; + write_register (HARD_PAGE_REGNUM, (pc >> 14) & 0x0ff); + pc &= 0x03fff; + write_register (HARD_PC_REGNUM, pc + 0x8000); + } + else + write_register (HARD_PC_REGNUM, pc); + return; + } + + m68hc11_initialize_register_info (); -#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ -sp = m68hc11_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p) + /* Store a soft register: translate into a memory write. */ + if (soft_regs[regno].name) + { + const int regsize = 2; + char *tmp = alloca (regsize); + memcpy (tmp, buf, regsize); + target_write_memory (soft_regs[regno].addr, tmp, regsize); + } +} -extern CORE_ADDR m68hc11_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR, - int, struct value **, - struct type *, int); -#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ - sp = m68hc11_push_arguments ((nargs), (args), (sp), \ - (struct_return), (struct_addr)) -extern CORE_ADDR m68hc11_push_arguments (int, struct value **, - CORE_ADDR, int, CORE_ADDR); +static const char * +m68hc11_register_name (int reg_nr) +{ + if (reg_nr == M68HC12_HARD_PC_REGNUM && USE_PAGE_REGISTER) + return "pc"; + if (reg_nr == HARD_PC_REGNUM && USE_PAGE_REGISTER) + return "ppc"; + + 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 const unsigned char * +m68hc11_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) +{ + static unsigned char breakpoint[] = {0x0}; + + *lenptr = sizeof (breakpoint); + return breakpoint; +} -/* Extract from an array REGBUF containing the (raw) register state - a function return value of type TYPE, and copy that, in virtual format, - into VALBUF. */ +/* Immediately after a function call, return the saved pc before the frame + is setup. */ -#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ -m68hc11_extract_return_value(TYPE, REGBUF, VALBUF) -extern void m68hc11_extract_return_value (struct type *, char *, char *); +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 get_frame_extra_info (frame)->return_pc; +} -/* Discard from the stack the innermost frame, - restoring all saved registers. */ -#define POP_FRAME m68hc11_pop_frame(); -extern void m68hc11_pop_frame (void); +static CORE_ADDR +m68hc11_frame_args_address (struct frame_info *frame) +{ + CORE_ADDR addr; + addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION + 2; + if (get_frame_extra_info (frame)->return_kind == RETURN_RTC) + addr += 1; + else if (get_frame_extra_info (frame)->return_kind == RETURN_RTI) + addr += 7; -/* Number of bits in the appropriate type. */ + return addr; +} -#define TARGET_INT_BIT (2 * TARGET_CHAR_BIT) -#define TARGET_PTR_BIT (2 * TARGET_CHAR_BIT) -#define TARGET_DOUBLE_BIT (4 * TARGET_CHAR_BIT) -#define TARGET_LONG_DOUBLE_BIT (8 * TARGET_CHAR_BIT) +static CORE_ADDR +m68hc11_frame_locals_address (struct frame_info *frame) +{ + return get_frame_base (frame); +} -#endif +/* Discard from the stack the innermost frame, restoring all saved + registers. */ -#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" +static void +m68hc11_pop_frame (void) +{ + register struct frame_info *frame = get_current_frame (); + register CORE_ADDR fp, sp; + register int regnum; + + if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), + get_frame_base (frame), + get_frame_base (frame))) + generic_pop_dummy_frame (); + else + { + fp = get_frame_base (frame); + DEPRECATED_FRAME_INIT_SAVED_REGS (frame); + + /* Copy regs from where they were saved in the frame. */ + for (regnum = 0; regnum < M68HC11_ALL_REGS; regnum++) + if (get_frame_saved_regs (frame)[regnum]) + write_register (regnum, + read_memory_integer (get_frame_saved_regs (frame)[regnum], 2)); + + write_register (HARD_PC_REGNUM, get_frame_extra_info (frame)->return_pc); + sp = (fp + get_frame_extra_info (frame)->size + 2) & 0x0ffff; + write_register (HARD_SP_REGNUM, sp); + } + flush_cached_frames (); +} -/* NOTE: This port is not finished. Several operations are not implemented - and will raise an error. Most of these functions concern the calling - of a function by GDB itself (command 'call') and retrieving data pushed - on the stack. */ + +/* 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_LDX_EXT (0xfe) +#define M6811_OP_PSHX (0x3c) +#define M6811_OP_STS (0x9f) +#define M6811_OP_STS_EXT (0xbf) +#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 (0x5f) +#define M6812_OP_STS_EXT (0x7f) +#define M6812_OP_LEAS (0x1b) +#define M6812_OP_PSHX (0x34) +#define M6812_OP_PSHY (0x35) + +/* 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. */ +}; -void m68hc11_frame_find_saved_regs (struct frame_info *fi, - struct frame_saved_regs *fsr); -static void m68hc11_pop_dummy_frame (struct frame_info *fi); +struct insn_sequence { + enum m6811_seq_type type; + unsigned length; + unsigned short code[MAX_CODES]; +}; -/* Table of registers for 68HC11. This includes the hard registers - and the pseudo hard registers used by GCC. */ -char* -m68hc11_register_names[] = -{ - "x", "d", "y", "sp", "pc", "a", "b", - "ccr", "z", "frame","tmp", "zs", "xy", - "ZD1", "ZD2", "ZD3", "ZD4", "ZD5", "ZD6", "ZD7", - "ZD8", "ZD9", "ZD10", "ZD11", "ZD12", "ZD13", "ZD14", - "ZD15", "ZD16", "ZD17", "ZD18", "ZD19", "ZD20", "ZD21", - "ZD22", "ZD23", "ZD24", "ZD25", "ZD26", "ZD27", "ZD28", - "ZD29", "ZD30", "ZD31", "ZD32" +/* 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 } }, + { P_SAVE_REG, 4, { M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW, + M6811_OP_PSHX } }, + { P_SAVE_REG, 6, { M6811_OP_PAGE2, M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW, + 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_SET_FRAME, 3, { M6811_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } }, + { P_LAST, 0, { 0 } } }; -static int reg_last = 32 * 2 + 6; -static int frame_index = 6; -/* Raise an error for operations which are not yet provided. */ -static void -m68hc11_not_yet (const char *operation) -{ - error ("Operation '%s' is not yet implemented\n", operation); -} +/* 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, 2, { M6812_OP_STS, OP_DIRECT } }, + { P_SET_FRAME, 3, { M6812_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } }, + { P_LOCAL_N, 2, { M6812_OP_LEAS, OP_PBYTE } }, + { P_LOCAL_2, 1, { M6812_OP_PSHX } }, + { P_LOCAL_2, 1, { M6812_OP_PSHY } }, + { P_LAST, 0 } +}; -/* Immediately after a function call, return the saved pc before the frame - is setup. For sun3's, we check for the common case of being inside of a - system call, and if so, we know that Sun pushes the call # on the stack - prior to doing the trap. */ -CORE_ADDR -m68hc11_saved_pc_after_call (struct frame_info *frame) +/* 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 addr = frame->frame + 1 + 2; + 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; + *pc = *pc + 1; + } + else if (buffer[j] == 0xf2) + { + v = read_memory_unsigned_integer (*pc + j + 1, 2); + *pc = *pc + 2; + } + cur_val = v; + break; + } + } - addr = read_register (SP_REGNUM) + 1; - addr &= 0x0ffff; - return read_memory_integer (addr, 2) & 0x0FFFF; + /* We have a full match. */ + if (j == seq->length) + { + *val = cur_val; + *pc = *pc + j; + return seq; + } + } + return 0; } -/* Discard from the stack the innermost frame, restoring all saved - registers. */ - -void -m68hc11_pop_frame (void) +/* Return the instruction that the function at the PC is using. */ +static enum insn_return_kind +m68hc11_get_return_insn (CORE_ADDR pc) { - m68hc11_not_yet ("m68hc11_pop_frame"); + struct minimal_symbol *sym; + + /* A flag indicating that this is a STO_M68HC12_FAR or STO_M68HC12_INTERRUPT + function is stored by elfread.c in the high bit of the info field. + Use this to decide which instruction the function uses to return. */ + sym = lookup_minimal_symbol_by_pc (pc); + if (sym == 0) + return RETURN_RTS; + + if (MSYMBOL_IS_RTC (sym)) + return RETURN_RTC; + else if (MSYMBOL_IS_RTI (sym)) + return RETURN_RTI; + else + return RETURN_RTS; } + /* 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* first_line, - int* frame_offset, int* pushed_regs) +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; - unsigned char op0, op1, op2; - int add_sp_mode; - int sp_adjust; int size; int found_frame_point; - int found_load; + int saved_reg; CORE_ADDR first_pc; - int reg_saved; + 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; - *pushed_regs = 0; *first_line = pc; return; } -#define OP_PAGE2 (0x18) -#define OP_LDX (0xde) -#define OP_LDY (0xde) -#define OP_PSHX (0x3c) -#define OP_PSHY (0x3c) -#define OP_STS (0x9f) -#define OP_TSX (0x30) -#define OP_TSY (0x30) -#define OP_XGDX (0x8f) -#define OP_XGDY (0x8f) -#define OP_ADDD (0xc3) -#define OP_TXS (0x35) -#define OP_TYS (0x35) - + seq_table = gdbarch_tdep (current_gdbarch)->prologue; + /* The 68hc11 stack is as follows: @@ -415,164 +739,69 @@ m68hc11_guess_from_prologue (CORE_ADDR pc, CORE_ADDR* first_line, */ pc = first_pc; func_end = pc + 128; - add_sp_mode = 0; found_frame_point = 0; - while (pc + 2 < func_end) + *frame_offset = 0; + save_addr = fp + STACK_CORRECTION; + while (!done && pc + 2 < func_end) { - op0 = read_memory_unsigned_integer (pc, 1); - op1 = read_memory_unsigned_integer (pc + 1, 1); - op2 = read_memory_unsigned_integer (pc + 2, 1); + struct insn_sequence *seq; + CORE_ADDR val; - /* ldx *frame */ - if (op0 == OP_LDX && op1 == frame_index) - { - pc += 2; - } + seq = m68hc11_analyze_instruction (seq_table, &pc, &val); + if (seq == 0) + break; - /* ldy *frame */ - else if (op0 == OP_PAGE2 && op1 == OP_LDY && op2 == frame_index) + if (seq->type == P_SAVE_REG) { - pc += 3; + 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; + } } - - /* pshx */ - else if (op0 == OP_PSHX) - { - pc += 1; - size += 2; - } - - /* pshy */ - else if (op0 == OP_PAGE2 && op1 == OP_PSHX) - { - pc += 2; - size += 2; - } - - /* sts *frame */ - else if (op0 == OP_STS && op1 == frame_index) + else if (seq->type == P_SET_FRAME) { found_frame_point = 1; - pc += 2; - break; - } - else if (op0 == OP_TSX && op1 == OP_XGDX) - { - add_sp_mode = 1; - pc += 2; + *frame_offset = size; } - else if (op0 == OP_PAGE2 && op1 == OP_TSY && op2 == OP_PAGE2) + else if (seq->type == P_LOCAL_1) { - op0 = read_memory_unsigned_integer (pc + 3, 1); - if (op0 != OP_XGDY) - break; - - add_sp_mode = 2; - pc += 4; - } - else if (add_sp_mode && op0 == OP_ADDD) - { - sp_adjust = read_memory_unsigned_integer (pc + 1, 2); - if (sp_adjust & 0x8000) - sp_adjust |= 0xffff0000L; - - sp_adjust = -sp_adjust; - add_sp_mode |= 4; - pc += 3; - } - else if (add_sp_mode == (1 | 4) && op0 == OP_XGDX - && op1 == OP_TXS) - { - size += sp_adjust; - pc += 2; - add_sp_mode = 0; + size += 1; } - else if (add_sp_mode == (2 | 4) && op0 == OP_PAGE2 - && op1 == OP_XGDY && op2 == OP_PAGE2) + else if (seq->type == P_LOCAL_2) { - op0 = read_memory_unsigned_integer (pc + 3, 1); - if (op0 != OP_TYS) - break; - - size += sp_adjust; - pc += 4; - add_sp_mode = 0; - } - else - { - break; - } - } - - if (found_frame_point == 0) - { - *frame_offset = 0; - } - else - { - *frame_offset = size; - } - - /* Now, look forward to see how many registers are pushed on the stack. - We look only for soft registers so there must be a first LDX *REG - before a PSHX. */ - reg_saved = 0; - found_load = 0; - while (pc + 2 < func_end) - { - op0 = read_memory_unsigned_integer (pc, 1); - op1 = read_memory_unsigned_integer (pc + 1, 1); - op2 = read_memory_unsigned_integer (pc + 2, 1); - if (op0 == OP_LDX && op1 > frame_index && op1 <= reg_last) - { - found_load = 1; - pc += 2; - } - else if (op0 == OP_PAGE2 && op1 == OP_LDY - && op2 > frame_index && op2 < reg_last) - { - found_load = 1; - pc += 3; - } - else if (op0 == OP_PSHX) - { - /* If there was no load, this is a push for a function call. */ - if (found_load == 0) - break; - - reg_saved += 2; - pc += 1; - found_load = 0; - } - else if (op0 == OP_PAGE2 && op1 == OP_PSHY) - { - if (found_load == 0) - break; - - reg_saved += 2; - pc += 2; - found_load = 0; + size += 2; } - else + else if (seq->type == P_LOCAL_N) { - break; + /* Stack pointer is decremented for the allocation. */ + if (val & 0x8000) + size -= (int) (val) | 0xffff0000; + else + size -= val; } } - *pushed_regs = reg_saved; *first_line = pc; } - -CORE_ADDR +static CORE_ADDR m68hc11_skip_prologue (CORE_ADDR pc) { CORE_ADDR func_addr, func_end; struct symtab_and_line sal; int frame_offset; - int pushed_args; - /* If we have line debugging information, then the end of the. */ - /* prologue should be the first assembly instruction of the + /* 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)) { @@ -581,35 +810,36 @@ m68hc11_skip_prologue (CORE_ADDR pc) return sal.end; } - m68hc11_guess_from_prologue (pc, &pc, &frame_offset, &pushed_args); + 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. -*/ +/* 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 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC + will be called for the new frame. */ -CORE_ADDR +static CORE_ADDR m68hc11_frame_chain (struct frame_info *frame) { - unsigned addr; + CORE_ADDR addr; + + if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), + get_frame_base (frame), + get_frame_base (frame))) + return get_frame_base (frame); /* dummy frame same as caller's frame */ - if (frame->return_pc == 0 || inside_entry_file(frame->return_pc)) - return (CORE_ADDR)0; + if (get_frame_extra_info (frame)->return_pc == 0 + || inside_entry_file (get_frame_extra_info (frame)->return_pc)) + return (CORE_ADDR) 0; - if (frame->frame == 0) + if (get_frame_base (frame) == 0) { return (CORE_ADDR) 0; } - addr = frame->frame + frame->size + 1 - 2; + addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION - 2; addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF; - if (addr == 0) - { - return (CORE_ADDR)0; - } - return addr; } @@ -618,42 +848,80 @@ m68hc11_frame_chain (struct frame_info *frame) 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. */ -void -m68hc11_frame_find_saved_regs (struct frame_info *fi, - struct frame_saved_regs *fsr) +static void +m68hc11_frame_init_saved_regs (struct frame_info *fi) { CORE_ADDR pc; - int saved; - - pc = fi->pc; - memset (fsr, 0, sizeof (*fsr)); - m68hc11_guess_from_prologue (pc, &pc, &fi->size, &saved); + CORE_ADDR addr; + + if (get_frame_saved_regs (fi) == NULL) + frame_saved_regs_zalloc (fi); + else + memset (get_frame_saved_regs (fi), 0, SIZEOF_FRAME_SAVED_REGS); + + pc = get_frame_pc (fi); + get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (pc); + m68hc11_guess_from_prologue (pc, get_frame_base (fi), &pc, + &get_frame_extra_info (fi)->size, + get_frame_saved_regs (fi)); + + addr = get_frame_base (fi) + get_frame_extra_info (fi)->size + STACK_CORRECTION; + if (soft_regs[SOFT_FP_REGNUM].name) + get_frame_saved_regs (fi)[SOFT_FP_REGNUM] = addr - 2; + + /* Take into account how the function was called/returns. */ + if (get_frame_extra_info (fi)->return_kind == RETURN_RTC) + { + get_frame_saved_regs (fi)[HARD_PAGE_REGNUM] = addr; + addr++; + } + else if (get_frame_extra_info (fi)->return_kind == RETURN_RTI) + { + get_frame_saved_regs (fi)[HARD_CCR_REGNUM] = addr; + get_frame_saved_regs (fi)[HARD_D_REGNUM] = addr + 1; + get_frame_saved_regs (fi)[HARD_X_REGNUM] = addr + 3; + get_frame_saved_regs (fi)[HARD_Y_REGNUM] = addr + 5; + addr += 7; + } + get_frame_saved_regs (fi)[HARD_SP_REGNUM] = addr; + get_frame_saved_regs (fi)[HARD_PC_REGNUM] = get_frame_saved_regs (fi)[HARD_SP_REGNUM]; } -void +static void m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi) { - unsigned addr; - struct frame_saved_regs dummy; + CORE_ADDR addr; - m68hc11_frame_find_saved_regs (fi, &dummy); + frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); + + if (get_next_frame (fi)) + deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); + + m68hc11_frame_init_saved_regs (fi); if (fromleaf) { - fi->return_pc = m68hc11_saved_pc_after_call (fi); + get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (get_frame_pc (fi)); + get_frame_extra_info (fi)->return_pc = m68hc11_saved_pc_after_call (fi); } else { - addr = fi->frame + fi->size + 1; - fi->return_pc = read_memory_unsigned_integer (addr, 2) & 0x0ffff; + addr = get_frame_saved_regs (fi)[HARD_PC_REGNUM]; + addr = read_memory_unsigned_integer (addr, 2) & 0x0ffff; + + /* Take into account the 68HC12 specific call (PC + page). */ + if (get_frame_extra_info (fi)->return_kind == RETURN_RTC + && addr >= 0x08000 && addr < 0x0c000 + && USE_PAGE_REGISTER) + { + CORE_ADDR page_addr = get_frame_saved_regs (fi)[HARD_PAGE_REGNUM]; -#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 + unsigned page = read_memory_unsigned_integer (page_addr, 1); + addr -= 0x08000; + addr += ((page & 0x0ff) << 14); + addr += 0x1000000; + } + get_frame_extra_info (fi)->return_pc = addr; } } @@ -661,13 +929,14 @@ m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi) static void show_regs (char *args, int from_tty) { - int ccr = read_register (PSW_REGNUM); + 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", - read_register (PC_REGNUM), - read_register (SP_REGNUM), - read_register (FP_REGNUM), + (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' : '-', @@ -678,76 +947,497 @@ show_regs (char *args, int from_tty) ccr & M6811_V_BIT ? 'V' : '-', ccr & M6811_C_BIT ? 'C' : '-'); - printf_filtered ("D=%04x IX=%04x IY=%04x\n", - read_register (D_REGNUM), - read_register (X_REGNUM), - read_register (Y_REGNUM)); - for (i = ZD1_REGNUM; i <= ZD32_REGNUM; i++) + printf_filtered ("D=%04x IX=%04x IY=%04x", + (int) read_register (HARD_D_REGNUM), + (int) read_register (HARD_X_REGNUM), + (int) read_register (HARD_Y_REGNUM)); + + if (USE_PAGE_REGISTER) { - printf_filtered ("ZD%d=%04x", - i - ZD1_REGNUM + 1, - read_register (i)); - if (((i - ZD1_REGNUM) % 8) == 7) + printf_filtered (" Page=%02x", + (int) read_register (HARD_PAGE_REGNUM)); + } + printf_filtered ("\n"); + + 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"); } -CORE_ADDR -m68hc11_fix_call_dummy (char *dummyname, - CORE_ADDR start_sp, - CORE_ADDR fun, - int nargs, - value_ptr *args, - struct type *type, - int gcc_p) -{ - m68hc11_not_yet ("m68hc11_fix_call_dummy"); - return 0; -} - -static void -m68hc11_pop_dummy_frame (struct frame_info *fi) +static CORE_ADDR +m68hc11_stack_align (CORE_ADDR addr) { - m68hc11_not_yet ("m68hc11_pop_dummy_frame"); + return ((addr + 1) & -2); } - -CORE_ADDR +static CORE_ADDR m68hc11_push_arguments (int nargs, - value_ptr *args, + struct value **args, CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr) { - m68hc11_not_yet ("m68hc11_push_arguments"); - return 0; + 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) { - m68hc11_not_yet ("m68hc11_call_dummy_address"); - return 0; + return entry_point_address (); +} + +static struct type * +m68hc11_register_virtual_type (int reg_nr) +{ + switch (reg_nr) + { + case HARD_PAGE_REGNUM: + case HARD_A_REGNUM: + case HARD_B_REGNUM: + case HARD_CCR_REGNUM: + return builtin_type_uint8; + + case M68HC12_HARD_PC_REGNUM: + return builtin_type_uint32; + + default: + 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 `valtype', + +/* Given a return value in `regbuf' with a type `type', extract and copy its value into `valbuf'. */ -void -m68hc11_extract_return_value (struct type *valtype, +static void +m68hc11_extract_return_value (struct type *type, char *regbuf, char *valbuf) { - m68hc11_not_yet ("m68hc11_extract_return_value"); + 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; +} + +/* Test whether the ELF symbol corresponds to a function using rtc or + rti to return. */ + +static void +m68hc11_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) +{ + unsigned char flags; + + flags = ((elf_symbol_type *)sym)->internal_elf_sym.st_other; + if (flags & STO_M68HC12_FAR) + MSYMBOL_SET_RTC (msym); + if (flags & STO_M68HC12_INTERRUPT) + MSYMBOL_SET_RTI (msym); +} + +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); +} + + + +/* 68HC11/68HC12 register groups. + Identify real hard registers and soft registers used by gcc. */ + +static struct reggroup *m68hc11_soft_reggroup; +static struct reggroup *m68hc11_hard_reggroup; + +static void +m68hc11_init_reggroups (void) +{ + m68hc11_hard_reggroup = reggroup_new ("hard", USER_REGGROUP); + m68hc11_soft_reggroup = reggroup_new ("soft", USER_REGGROUP); +} + +static void +m68hc11_add_reggroups (struct gdbarch *gdbarch) +{ + reggroup_add (gdbarch, m68hc11_hard_reggroup); + reggroup_add (gdbarch, m68hc11_soft_reggroup); + reggroup_add (gdbarch, general_reggroup); + reggroup_add (gdbarch, float_reggroup); + reggroup_add (gdbarch, all_reggroup); + reggroup_add (gdbarch, save_reggroup); + reggroup_add (gdbarch, restore_reggroup); + reggroup_add (gdbarch, vector_reggroup); + reggroup_add (gdbarch, system_reggroup); +} + +static int +m68hc11_register_reggroup_p (struct gdbarch *gdbarch, int regnum, + struct reggroup *group) +{ + /* We must save the real hard register as well as gcc + soft registers including the frame pointer. */ + if (group == save_reggroup || group == restore_reggroup) + { + return (regnum <= gdbarch_num_regs (gdbarch) + || ((regnum == SOFT_FP_REGNUM + || regnum == SOFT_TMP_REGNUM + || regnum == SOFT_ZS_REGNUM + || regnum == SOFT_XY_REGNUM) + && m68hc11_register_name (regnum))); + } + + /* Group to identify gcc soft registers (d1..dN). */ + if (group == m68hc11_soft_reggroup) + { + return regnum >= SOFT_D1_REGNUM && m68hc11_register_name (regnum); + } + + if (group == m68hc11_hard_reggroup) + { + return regnum == HARD_PC_REGNUM || regnum == HARD_SP_REGNUM + || regnum == HARD_X_REGNUM || regnum == HARD_D_REGNUM + || regnum == HARD_Y_REGNUM || regnum == HARD_CCR_REGNUM; + } + return default_register_reggroup_p (gdbarch, regnum, group); +} + +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; + int elf_flags; + + soft_reg_initialized = 0; + + /* Extract the elf_flags if available. */ + if (info.abfd != NULL + && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour) + elf_flags = elf_elfheader (info.abfd)->e_flags; + else + elf_flags = 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)) + { + if (gdbarch_tdep (arches->gdbarch)->elf_flags != elf_flags) + continue; + + 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); + tdep->elf_flags = elf_flags; + + /* NOTE: cagney/2002-12-06: This can be deleted when this arch is + ready to unwind the PC first (see frame.c:get_prev_frame()). */ + set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); + + switch (info.bfd_arch_info->arch) + { + case bfd_arch_m68hc11: + tdep->stack_correction = 1; + tdep->use_page_register = 0; + tdep->prologue = m6811_prologue; + set_gdbarch_addr_bit (gdbarch, 16); + set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS); + set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM); + set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS); + break; + + case bfd_arch_m68hc12: + tdep->stack_correction = 0; + tdep->use_page_register = elf_flags & E_M68HC12_BANKS; + tdep->prologue = m6812_prologue; + set_gdbarch_addr_bit (gdbarch, elf_flags & E_M68HC12_BANKS ? 32 : 16); + set_gdbarch_num_pseudo_regs (gdbarch, + elf_flags & E_M68HC12_BANKS + ? M68HC12_NUM_PSEUDO_REGS + : M68HC11_NUM_PSEUDO_REGS); + set_gdbarch_pc_regnum (gdbarch, elf_flags & E_M68HC12_BANKS + ? M68HC12_HARD_PC_REGNUM : HARD_PC_REGNUM); + set_gdbarch_num_regs (gdbarch, elf_flags & E_M68HC12_BANKS + ? M68HC12_NUM_REGS : M68HC11_NUM_REGS); + break; + + default: + break; + } + + /* Initially set everything according to the ABI. + Use 16-bit integers since it will be the case for most + programs. The size of these types should normally be set + according to the dwarf2 debug information. */ + set_gdbarch_short_bit (gdbarch, 16); + set_gdbarch_int_bit (gdbarch, elf_flags & E_M68HC11_I32 ? 32 : 16); + set_gdbarch_float_bit (gdbarch, 32); + set_gdbarch_double_bit (gdbarch, elf_flags & E_M68HC11_F64 ? 64 : 32); + 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_deprecated_max_register_raw_size (gdbarch, 2); + set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 2); + set_gdbarch_deprecated_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_sp (gdbarch, generic_target_read_sp); + set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp); + + set_gdbarch_sp_regnum (gdbarch, HARD_SP_REGNUM); + set_gdbarch_deprecated_fp_regnum (gdbarch, SOFT_FP_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_pseudo_register_read (gdbarch, m68hc11_pseudo_register_read); + set_gdbarch_pseudo_register_write (gdbarch, m68hc11_pseudo_register_write); + + set_gdbarch_call_dummy_address (gdbarch, m68hc11_call_dummy_address); + set_gdbarch_call_dummy_words (gdbarch, m68hc11_call_dummy_words); + set_gdbarch_sizeof_call_dummy_words (gdbarch, + sizeof (m68hc11_call_dummy_words)); + set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register); + set_gdbarch_deprecated_extract_return_value (gdbarch, m68hc11_extract_return_value); + set_gdbarch_deprecated_push_arguments (gdbarch, m68hc11_push_arguments); + set_gdbarch_deprecated_push_return_address (gdbarch, m68hc11_push_return_address); + set_gdbarch_return_value_on_stack (gdbarch, m68hc11_return_value_on_stack); + + set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return); + set_gdbarch_deprecated_store_return_value (gdbarch, m68hc11_store_return_value); + set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68hc11_extract_struct_value_address); + set_gdbarch_register_convertible (gdbarch, generic_register_convertible_not); + + + set_gdbarch_deprecated_frame_chain (gdbarch, m68hc11_frame_chain); + set_gdbarch_deprecated_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_deprecated_saved_pc_after_call (gdbarch, m68hc11_saved_pc_after_call); + set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); + + set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register); + + set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return); + set_gdbarch_deprecated_store_return_value (gdbarch, m68hc11_store_return_value); + set_gdbarch_deprecated_extract_struct_value_address + (gdbarch, m68hc11_extract_struct_value_address); + set_gdbarch_use_struct_convention (gdbarch, m68hc11_use_struct_convention); + set_gdbarch_deprecated_init_extra_frame_info (gdbarch, m68hc11_init_extra_frame_info); + set_gdbarch_deprecated_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_deprecated_extra_stack_alignment_needed (gdbarch, 1); + set_gdbarch_print_insn (gdbarch, gdb_print_insn_m68hc11); + + m68hc11_add_reggroups (gdbarch); + set_gdbarch_register_reggroup_p (gdbarch, m68hc11_register_reggroup_p); + + /* Minsymbol frobbing. */ + set_gdbarch_elf_make_msymbol_special (gdbarch, + m68hc11_elf_make_msymbol_special); + + set_gdbarch_believe_pcc_promotion (gdbarch, 1); + + return gdbarch; } void _initialize_m68hc11_tdep (void) { - tm_print_insn = print_insn_m68hc11; + register_gdbarch_init (bfd_arch_m68hc11, m68hc11_gdbarch_init); + register_gdbarch_init (bfd_arch_m68hc12, m68hc11_gdbarch_init); + m68hc11_init_reggroups (); add_com ("regs", class_vars, show_regs, "Print all registers"); }