| /* Target-dependent code for Hitachi H8/500, for GDB. |
| |
| Copyright 1993, 1994, 1995, 1998, 2000, 2001, 2002 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 "symtab.h" |
| #include "gdbtypes.h" |
| #include "gdbcmd.h" |
| #include "value.h" |
| #include "dis-asm.h" |
| #include "gdbcore.h" |
| #include "regcache.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 (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 (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 (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 (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 (struct frame_info *frame) |
| { |
| return read_memory_integer (FRAME_FP (frame) + 2, PTR_SIZE); |
| } |
| |
| void |
| h8500_pop_frame (void) |
| { |
| 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 (int regno) |
| { |
| if (regno == CCR_REGNUM) |
| { |
| /* CCR register */ |
| |
| int C, Z, N, V; |
| unsigned char b[2]; |
| unsigned char l; |
| |
| frame_register_read (selected_frame, 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 (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: |
| internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
| } |
| } |
| |
| struct type * |
| h8500_register_virtual_type (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: |
| internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
| } |
| } |
| |
| /* 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 (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 (void) |
| { |
| 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 (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 (char *arg, int from_tty) |
| { |
| h8500_set_pointer_size (32); |
| code_size = 4; |
| data_size = 4; |
| } |
| |
| static void |
| medium_command (char *arg, int from_tty) |
| { |
| h8500_set_pointer_size (32); |
| code_size = 4; |
| data_size = 2; |
| } |
| |
| static void |
| compact_command (char *arg, int from_tty) |
| { |
| h8500_set_pointer_size (32); |
| code_size = 2; |
| data_size = 4; |
| } |
| |
| static void |
| small_command (char *arg, int from_tty) |
| { |
| h8500_set_pointer_size (16); |
| code_size = 2; |
| data_size = 2; |
| } |
| |
| static struct cmd_list_element *setmemorylist; |
| |
| static void |
| set_memory (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 (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; |
| } |
| |
| struct value * |
| h8500_value_of_trapped_internalvar (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 */ |
| |
| xfree (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 (struct internalvar *var, struct value *newval, |
| int bitpos, int bitsize, int offset) |
| { |
| 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 (void) |
| { |
| return read_register (PR7_REGNUM); |
| } |
| |
| void |
| h8500_write_sp (CORE_ADDR v) |
| { |
| write_register (PR7_REGNUM, v); |
| } |
| |
| CORE_ADDR |
| h8500_read_pc (ptid_t ptid) |
| { |
| return read_register (PC_REGNUM); |
| } |
| |
| void |
| h8500_write_pc (CORE_ADDR v, ptid_t ptid) |
| { |
| write_register (PC_REGNUM, v); |
| } |
| |
| CORE_ADDR |
| h8500_read_fp (void) |
| { |
| return read_register (PR6_REGNUM); |
| } |
| |
| void |
| _initialize_h8500_tdep (void) |
| { |
| 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); |
| |
| } |