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Diffstat (limited to 'gdb/h8500-tdep.c')
| -rw-r--r-- | gdb/h8500-tdep.c | 653 |
1 files changed, 653 insertions, 0 deletions
diff --git a/gdb/h8500-tdep.c b/gdb/h8500-tdep.c new file mode 100644 index 0000000..49fab2d --- /dev/null +++ b/gdb/h8500-tdep.c @@ -0,0 +1,653 @@ +/* Target-dependent code for Hitachi H8/500, for GDB. + Copyright 1993, 1994, 1995 Free Software Foundation, Inc. + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* + Contributed by Steve Chamberlain + sac@cygnus.com + */ + +#include "defs.h" +#include "frame.h" +#include "obstack.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "gdbcmd.h" +#include "value.h" +#include "dis-asm.h" +#include "gdbcore.h" + +#define UNSIGNED_SHORT(X) ((X) & 0xffff) + +static int code_size = 2; + +static int data_size = 2; + +/* Shape of an H8/500 frame : + + arg-n + .. + arg-2 + arg-1 + return address <2 or 4 bytes> + old fp <2 bytes> + auto-n + .. + auto-1 + saved registers + +*/ + +/* an easy to debug H8 stack frame looks like: +0x6df6 push r6 +0x0d76 mov.w r7,r6 +0x6dfn push reg +0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp +0x1957 sub.w r5,sp + + */ + +#define IS_PUSH(x) (((x) & 0xff00)==0x6d00) +#define IS_LINK_8(x) ((x) == 0x17) +#define IS_LINK_16(x) ((x) == 0x1f) +#define IS_MOVE_FP(x) ((x) == 0x0d76) +#define IS_MOV_SP_FP(x) ((x) == 0x0d76) +#define IS_SUB2_SP(x) ((x) == 0x1b87) +#define IS_MOVK_R5(x) ((x) == 0x7905) +#define IS_SUB_R5SP(x) ((x) == 0x1957) + +#define LINK_8 0x17 +#define LINK_16 0x1f + +int minimum_mode = 1; + +CORE_ADDR +h8500_skip_prologue (start_pc) + CORE_ADDR start_pc; +{ + short int w; + + w = read_memory_integer (start_pc, 1); + if (w == LINK_8) + { + start_pc += 2; + w = read_memory_integer (start_pc, 1); + } + + if (w == LINK_16) + { + start_pc += 3; + w = read_memory_integer (start_pc, 2); + } + + return start_pc; +} + +CORE_ADDR +h8500_addr_bits_remove (addr) + CORE_ADDR addr; +{ + return ((addr) & 0xffffff); +} + +/* 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. + + For us, the frame address is its stack pointer value, so we look up + the function prologue to determine the caller's sp value, and return it. */ + +CORE_ADDR +h8500_frame_chain (thisframe) + struct frame_info *thisframe; +{ + if (!inside_entry_file (thisframe->pc)) + return (read_memory_integer (FRAME_FP (thisframe), PTR_SIZE)); + else + return 0; +} + +/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or + is not the address of a valid instruction, the address of the next + instruction beyond ADDR otherwise. *PWORD1 receives the first word + of the instruction.*/ + +CORE_ADDR +NEXT_PROLOGUE_INSN (addr, lim, pword1) + CORE_ADDR addr; + CORE_ADDR lim; + char *pword1; +{ + if (addr < lim + 8) + { + read_memory (addr, pword1, 1); + read_memory (addr, pword1 + 1, 1); + return 1; + } + return 0; +} + +/* Examine the prologue of a function. `ip' points to the first + instruction. `limit' is the limit of the prologue (e.g. the addr + of the first linenumber, or perhaps the program counter if we're + stepping through). `frame_sp' is the stack pointer value in use in + this frame. `fsr' is a pointer to a frame_saved_regs structure + into which we put info about the registers saved by this frame. + `fi' is a struct frame_info pointer; we fill in various fields in + it to reflect the offsets of the arg pointer and the locals + pointer. */ + +/* Return the saved PC from this frame. */ + +CORE_ADDR +frame_saved_pc (frame) + struct frame_info *frame; +{ + return read_memory_integer (FRAME_FP (frame) + 2, PTR_SIZE); +} + +void +h8500_pop_frame () +{ + unsigned regnum; + struct frame_saved_regs fsr; + struct frame_info *frame = get_current_frame (); + + get_frame_saved_regs (frame, &fsr); + + for (regnum = 0; regnum < 8; regnum++) + { + if (fsr.regs[regnum]) + write_register (regnum, read_memory_short (fsr.regs[regnum])); + + flush_cached_frames (); + } +} + +void +print_register_hook (regno) + int regno; +{ + if (regno == CCR_REGNUM) + { + /* CCR register */ + + int C, Z, N, V; + unsigned char b[2]; + unsigned char l; + + read_relative_register_raw_bytes (regno, b); + l = b[1]; + printf_unfiltered ("\t"); + printf_unfiltered ("I-%d - ", (l & 0x80) != 0); + N = (l & 0x8) != 0; + Z = (l & 0x4) != 0; + V = (l & 0x2) != 0; + C = (l & 0x1) != 0; + printf_unfiltered ("N-%d ", N); + printf_unfiltered ("Z-%d ", Z); + printf_unfiltered ("V-%d ", V); + printf_unfiltered ("C-%d ", C); + if ((C | Z) == 0) + printf_unfiltered ("u> "); + if ((C | Z) == 1) + printf_unfiltered ("u<= "); + if ((C == 0)) + printf_unfiltered ("u>= "); + if (C == 1) + printf_unfiltered ("u< "); + if (Z == 0) + printf_unfiltered ("!= "); + if (Z == 1) + printf_unfiltered ("== "); + if ((N ^ V) == 0) + printf_unfiltered (">= "); + if ((N ^ V) == 1) + printf_unfiltered ("< "); + if ((Z | (N ^ V)) == 0) + printf_unfiltered ("> "); + if ((Z | (N ^ V)) == 1) + printf_unfiltered ("<= "); + } +} + +int +h8500_register_size (regno) + int regno; +{ + switch (regno) + { + case SEG_C_REGNUM: + case SEG_D_REGNUM: + case SEG_E_REGNUM: + case SEG_T_REGNUM: + return 1; + case R0_REGNUM: + case R1_REGNUM: + case R2_REGNUM: + case R3_REGNUM: + case R4_REGNUM: + case R5_REGNUM: + case R6_REGNUM: + case R7_REGNUM: + case CCR_REGNUM: + return 2; + + case PR0_REGNUM: + case PR1_REGNUM: + case PR2_REGNUM: + case PR3_REGNUM: + case PR4_REGNUM: + case PR5_REGNUM: + case PR6_REGNUM: + case PR7_REGNUM: + case PC_REGNUM: + return 4; + default: + abort (); + } +} + +struct type * +h8500_register_virtual_type (regno) + int regno; +{ + switch (regno) + { + case SEG_C_REGNUM: + case SEG_E_REGNUM: + case SEG_D_REGNUM: + case SEG_T_REGNUM: + return builtin_type_unsigned_char; + case R0_REGNUM: + case R1_REGNUM: + case R2_REGNUM: + case R3_REGNUM: + case R4_REGNUM: + case R5_REGNUM: + case R6_REGNUM: + case R7_REGNUM: + case CCR_REGNUM: + return builtin_type_unsigned_short; + case PR0_REGNUM: + case PR1_REGNUM: + case PR2_REGNUM: + case PR3_REGNUM: + case PR4_REGNUM: + case PR5_REGNUM: + case PR6_REGNUM: + case PR7_REGNUM: + case PC_REGNUM: + return builtin_type_unsigned_long; + default: + abort (); + } +} + +/* 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. */ + +void +frame_find_saved_regs (frame_info, frame_saved_regs) + struct frame_info *frame_info; + struct frame_saved_regs *frame_saved_regs; +{ + register int regnum; + register int regmask; + register CORE_ADDR next_addr; + register CORE_ADDR pc; + unsigned char thebyte; + + memset (frame_saved_regs, '\0', sizeof *frame_saved_regs); + + if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 + && (frame_info)->pc <= (frame_info)->frame) + { + next_addr = (frame_info)->frame; + pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; + } + else + { + pc = get_pc_function_start ((frame_info)->pc); + /* Verify we have a link a6 instruction next; + if not we lose. If we win, find the address above the saved + regs using the amount of storage from the link instruction. + */ + + thebyte = read_memory_integer (pc, 1); + if (0x1f == thebyte) + next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 2), pc += 2; + else if (0x17 == thebyte) + next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 1), pc += 1; + else + goto lose; +#if 0 + /* FIXME steve */ + /* If have an add:g.waddal #-n, sp next, adjust next_addr. */ + if ((0x0c0177777 & read_memory_integer (pc, 2)) == 0157774) + next_addr += read_memory_integer (pc += 2, 4), pc += 4; +#endif + } + + thebyte = read_memory_integer (pc, 1); + if (thebyte == 0x12) + { + /* Got stm */ + pc++; + regmask = read_memory_integer (pc, 1); + pc++; + for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) + { + if (regmask & 1) + { + (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2; + } + } + thebyte = read_memory_integer (pc, 1); + } + /* Maybe got a load of pushes */ + while (thebyte == 0xbf) + { + pc++; + regnum = read_memory_integer (pc, 1) & 0x7; + pc++; + (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2; + thebyte = read_memory_integer (pc, 1); + } + +lose:; + + /* Remember the address of the frame pointer */ + (frame_saved_regs)->regs[FP_REGNUM] = (frame_info)->frame; + + /* This is where the old sp is hidden */ + (frame_saved_regs)->regs[SP_REGNUM] = (frame_info)->frame; + + /* And the PC - remember the pushed FP is always two bytes long */ + (frame_saved_regs)->regs[PC_REGNUM] = (frame_info)->frame + 2; +} + +CORE_ADDR +saved_pc_after_call () +{ + int x; + int a = read_register (SP_REGNUM); + + x = read_memory_integer (a, code_size); + if (code_size == 2) + { + /* Stick current code segement onto top */ + x &= 0xffff; + x |= read_register (SEG_C_REGNUM) << 16; + } + x &= 0xffffff; + return x; +} + +void +h8500_set_pointer_size (newsize) + int newsize; +{ + static int oldsize = 0; + + if (oldsize != newsize) + { + printf_unfiltered ("pointer size set to %d bits\n", newsize); + oldsize = newsize; + if (newsize == 32) + { + minimum_mode = 0; + } + else + { + minimum_mode = 1; + } + _initialize_gdbtypes (); + } +} + +static void +big_command () +{ + h8500_set_pointer_size (32); + code_size = 4; + data_size = 4; +} + +static void +medium_command () +{ + h8500_set_pointer_size (32); + code_size = 4; + data_size = 2; +} + +static void +compact_command () +{ + h8500_set_pointer_size (32); + code_size = 2; + data_size = 4; +} + +static void +small_command () +{ + h8500_set_pointer_size (16); + code_size = 2; + data_size = 2; +} + +static struct cmd_list_element *setmemorylist; + +static void +set_memory (args, from_tty) + char *args; + int from_tty; +{ + printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n"); + help_list (setmemorylist, "set memory ", -1, gdb_stdout); +} + +/* See if variable name is ppc or pr[0-7] */ + +int +h8500_is_trapped_internalvar (name) + char *name; +{ + if (name[0] != 'p') + return 0; + + if (strcmp (name + 1, "pc") == 0) + return 1; + + if (name[1] == 'r' + && name[2] >= '0' + && name[2] <= '7' + && name[3] == '\000') + return 1; + else + return 0; +} + +value_ptr +h8500_value_of_trapped_internalvar (var) + struct internalvar *var; +{ + LONGEST regval; + unsigned char regbuf[4]; + int page_regnum, regnum; + + regnum = var->name[2] == 'c' ? PC_REGNUM : var->name[2] - '0'; + + switch (var->name[2]) + { + case 'c': + page_regnum = SEG_C_REGNUM; + break; + case '0': + case '1': + case '2': + case '3': + page_regnum = SEG_D_REGNUM; + break; + case '4': + case '5': + page_regnum = SEG_E_REGNUM; + break; + case '6': + case '7': + page_regnum = SEG_T_REGNUM; + break; + } + + get_saved_register (regbuf, NULL, NULL, selected_frame, page_regnum, NULL); + regval = regbuf[0] << 16; + + get_saved_register (regbuf, NULL, NULL, selected_frame, regnum, NULL); + regval |= regbuf[0] << 8 | regbuf[1]; /* XXX host/target byte order */ + + free (var->value); /* Free up old value */ + + var->value = value_from_longest (builtin_type_unsigned_long, regval); + release_value (var->value); /* Unchain new value */ + + VALUE_LVAL (var->value) = lval_internalvar; + VALUE_INTERNALVAR (var->value) = var; + return var->value; +} + +void +h8500_set_trapped_internalvar (var, newval, bitpos, bitsize, offset) + struct internalvar *var; + int offset, bitpos, bitsize; + value_ptr newval; +{ + char *page_regnum, *regnum; + char expression[100]; + unsigned new_regval; + struct type *type; + enum type_code newval_type_code; + + type = check_typedef (VALUE_TYPE (newval)); + newval_type_code = TYPE_CODE (type); + + if ((newval_type_code != TYPE_CODE_INT + && newval_type_code != TYPE_CODE_PTR) + || TYPE_LENGTH (type) != sizeof (new_regval)) + error ("Illegal type (%s) for assignment to $%s\n", + TYPE_NAME (VALUE_TYPE (newval)), var->name); + + new_regval = *(long *) VALUE_CONTENTS_RAW (newval); + + regnum = var->name + 1; + + switch (var->name[2]) + { + case 'c': + page_regnum = "cp"; + break; + case '0': + case '1': + case '2': + case '3': + page_regnum = "dp"; + break; + case '4': + case '5': + page_regnum = "ep"; + break; + case '6': + case '7': + page_regnum = "tp"; + break; + } + + sprintf (expression, "$%s=%d", page_regnum, new_regval >> 16); + parse_and_eval (expression); + + sprintf (expression, "$%s=%d", regnum, new_regval & 0xffff); + parse_and_eval (expression); +} + +CORE_ADDR +h8500_read_sp () +{ + return read_register (PR7_REGNUM); +} + +void +h8500_write_sp (v) + CORE_ADDR v; +{ + write_register (PR7_REGNUM, v); +} + +CORE_ADDR +h8500_read_pc (pid) + int pid; +{ + return read_register (PC_REGNUM); +} + +void +h8500_write_pc (v, pid) + CORE_ADDR v; + int pid; +{ + write_register (PC_REGNUM, v); +} + +CORE_ADDR +h8500_read_fp () +{ + return read_register (PR6_REGNUM); +} + +void +h8500_write_fp (v) + CORE_ADDR v; +{ + write_register (PR6_REGNUM, v); +} + +void +_initialize_h8500_tdep () +{ + tm_print_insn = print_insn_h8500; + + add_prefix_cmd ("memory", no_class, set_memory, + "set the memory model", &setmemorylist, "set memory ", 0, + &setlist); + + add_cmd ("small", class_support, small_command, + "Set small memory model. (16 bit code, 16 bit data)", &setmemorylist); + + add_cmd ("big", class_support, big_command, + "Set big memory model. (32 bit code, 32 bit data)", &setmemorylist); + + add_cmd ("medium", class_support, medium_command, + "Set medium memory model. (32 bit code, 16 bit data)", &setmemorylist); + + add_cmd ("compact", class_support, compact_command, + "Set compact memory model. (16 bit code, 32 bit data)", &setmemorylist); + +} |