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[/] [or1k/] [tags/] [start/] [gdb-5.0/] [gdb/] [z8k-tdep.c] - Rev 1780
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/* Target-machine dependent code for Zilog Z8000, for GDB. Copyright (C) 1992, 1993, 1994 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 "gdbcmd.h" #include "gdbtypes.h" #include "dis-asm.h" #include "gdbcore.h" #include "value.h" /* For read_register() */ static int read_memory_pointer (CORE_ADDR x); /* Return the saved PC from this frame. If the frame has a memory copy of SRP_REGNUM, use that. If not, just use the register SRP_REGNUM itself. */ CORE_ADDR z8k_frame_saved_pc (frame) struct frame_info *frame; { return read_memory_pointer (frame->frame + (BIG ? 4 : 2)); } #define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0)) #define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0)) #define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa) #define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76) #define IS_SUB2_SP(x) (x==0x1b87) #define IS_MOVK_R5(x) (x==0x7905) #define IS_SUB_SP(x) ((x & 0xffff) == 0x020f) #define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa)) /* work out how much local space is on the stack and return the pc pointing to the first push */ static CORE_ADDR skip_adjust (pc, size) CORE_ADDR pc; int *size; { *size = 0; if (IS_PUSH_FP (read_memory_short (pc)) && IS_MOV_SP_FP (read_memory_short (pc + 2))) { /* This is a function with an explict frame pointer */ pc += 4; *size += 2; /* remember the frame pointer */ } /* remember any stack adjustment */ if (IS_SUB_SP (read_memory_short (pc))) { *size += read_memory_short (pc + 2); pc += 4; } return pc; } static CORE_ADDR examine_frame PARAMS ((CORE_ADDR, CORE_ADDR * regs, CORE_ADDR)); static CORE_ADDR examine_frame (pc, regs, sp) CORE_ADDR pc; CORE_ADDR *regs; CORE_ADDR sp; { int w = read_memory_short (pc); int offset = 0; int regno; for (regno = 0; regno < NUM_REGS; regno++) regs[regno] = 0; while (IS_PUSHW (w) || IS_PUSHL (w)) { /* work out which register is being pushed to where */ if (IS_PUSHL (w)) { regs[w & 0xf] = offset; regs[(w & 0xf) + 1] = offset + 2; offset += 4; } else { regs[w & 0xf] = offset; offset += 2; } pc += 2; w = read_memory_short (pc); } if (IS_MOVE_FP (w)) { /* We know the fp */ } else if (IS_SUB_SP (w)) { /* Subtracting a value from the sp, so were in a function which needs stack space for locals, but has no fp. We fake up the values as if we had an fp */ regs[FP_REGNUM] = sp; } else { /* This one didn't have an fp, we'll fake it up */ regs[SP_REGNUM] = sp; } /* stack pointer contains address of next frame */ /* regs[fp_regnum()] = fp; */ regs[SP_REGNUM] = sp; return pc; } CORE_ADDR z8k_skip_prologue (start_pc) CORE_ADDR start_pc; { CORE_ADDR dummy[NUM_REGS]; return examine_frame (start_pc, dummy, 0); } CORE_ADDR z8k_addr_bits_remove (addr) CORE_ADDR addr; { return (addr & PTR_MASK); } static int read_memory_pointer (CORE_ADDR x) { return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2); } CORE_ADDR z8k_frame_chain (thisframe) struct frame_info *thisframe; { if (thisframe->prev == 0) { /* This is the top of the stack, let's get the sp for real */ } if (!inside_entry_file (thisframe->pc)) { return read_memory_pointer (thisframe->frame); } return 0; } void init_frame_pc () { 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 z8k_frame_init_saved_regs (frame_info) struct frame_info *frame_info; { CORE_ADDR pc; int w; frame_saved_regs_zalloc (frame_info); pc = get_pc_function_start (frame_info->pc); /* wander down the instruction stream */ examine_frame (pc, frame_info->saved_regs, frame_info->frame); } void z8k_push_dummy_frame () { abort (); } int gdb_print_insn_z8k (memaddr, info) bfd_vma memaddr; disassemble_info *info; { if (BIG) return print_insn_z8001 (memaddr, info); else return print_insn_z8002 (memaddr, info); } /* 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; short *pword1; { char buf[2]; if (addr < lim + 8) { read_memory (addr, buf, 2); *pword1 = extract_signed_integer (buf, 2); return addr + 2; } return 0; } #if 0 /* 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. We cache the result of doing this in the frame_cache_obstack, since it is fairly expensive. */ void frame_find_saved_regs (fip, fsrp) struct frame_info *fip; struct frame_saved_regs *fsrp; { int locals; CORE_ADDR pc; CORE_ADDR adr; int i; memset (fsrp, 0, sizeof *fsrp); pc = skip_adjust (get_pc_function_start (fip->pc), &locals); { adr = FRAME_FP (fip) - locals; for (i = 0; i < 8; i++) { int word = read_memory_short (pc); pc += 2; if (IS_PUSHL (word)) { fsrp->regs[word & 0xf] = adr; fsrp->regs[(word & 0xf) + 1] = adr - 2; adr -= 4; } else if (IS_PUSHW (word)) { fsrp->regs[word & 0xf] = adr; adr -= 2; } else break; } } fsrp->regs[PC_REGNUM] = fip->frame + 4; fsrp->regs[FP_REGNUM] = fip->frame; } #endif int z8k_saved_pc_after_call (struct frame_info *frame) { return ADDR_BITS_REMOVE (read_memory_integer (read_register (SP_REGNUM), PTR_SIZE)); } void extract_return_value (type, regbuf, valbuf) struct type *type; char *regbuf; char *valbuf; { int b; int len = TYPE_LENGTH (type); for (b = 0; b < len; b += 2) { int todo = len - b; if (todo > 2) todo = 2; memcpy (valbuf + b, regbuf + b, todo); } } void write_return_value (type, valbuf) struct type *type; char *valbuf; { int reg; int len; for (len = 0; len < TYPE_LENGTH (type); len += 2) write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2); } void store_struct_return (addr, sp) CORE_ADDR addr; CORE_ADDR sp; { write_register (2, addr); } void z8k_print_register_hook (regno) int regno; { if ((regno & 1) == 0 && regno < 16) { unsigned short l[2]; read_relative_register_raw_bytes (regno, (char *) (l + 0)); read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); printf_unfiltered ("\t"); printf_unfiltered ("%04x%04x", l[0], l[1]); } if ((regno & 3) == 0 && regno < 16) { unsigned short l[4]; read_relative_register_raw_bytes (regno, (char *) (l + 0)); read_relative_register_raw_bytes (regno + 1, (char *) (l + 1)); read_relative_register_raw_bytes (regno + 2, (char *) (l + 2)); read_relative_register_raw_bytes (regno + 3, (char *) (l + 3)); printf_unfiltered ("\t"); printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]); } if (regno == 15) { unsigned short rval; int i; read_relative_register_raw_bytes (regno, (char *) (&rval)); printf_unfiltered ("\n"); for (i = 0; i < 10; i += 2) { printf_unfiltered ("(sp+%d=%04x)", i, (unsigned int)read_memory_short (rval + i)); } } } void z8k_pop_frame () { } struct cmd_list_element *setmemorylist; void z8k_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) { BIG = 1; } else { BIG = 0; } /* FIXME: This code should be using the GDBARCH framework to handle changed type sizes. If this problem is ever fixed (the direct reference to _initialize_gdbtypes() below eliminated) then Makefile.in should be updated so that z8k-tdep.c is again compiled with -Werror. */ _initialize_gdbtypes (); } } static void segmented_command (args, from_tty) char *args; int from_tty; { z8k_set_pointer_size (32); } static void unsegmented_command (args, from_tty) char *args; int from_tty; { z8k_set_pointer_size (16); } 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); } void _initialize_z8ktdep () { tm_print_insn = gdb_print_insn_z8k; add_prefix_cmd ("memory", no_class, set_memory, "set the memory model", &setmemorylist, "set memory ", 0, &setlist); add_cmd ("segmented", class_support, segmented_command, "Set segmented memory model.", &setmemorylist); add_cmd ("unsegmented", class_support, unsegmented_command, "Set unsegmented memory model.", &setmemorylist); }
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