| /* Target-machine dependent code for Hitachi H8/300, for GDB. |
| Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
| 2000, 2001 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 "dis-asm.h" |
| #include "gdbcmd.h" |
| #include "gdbtypes.h" |
| #include "gdbcore.h" |
| #include "gdb_string.h" |
| #include "value.h" |
| #include "regcache.h" |
| |
| extern int h8300hmode, h8300smode; |
| |
| #undef NUM_REGS |
| #define NUM_REGS 11 |
| |
| #define UNSIGNED_SHORT(X) ((X) & 0xffff) |
| |
| #define IS_PUSH(x) ((x & 0xfff0)==0x6df0) |
| #define IS_PUSH_FP(x) (x == 0x6df6) |
| #define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6) |
| #define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6) |
| #define IS_SUB2_SP(x) (x==0x1b87) |
| #define IS_SUB4_SP(x) (x==0x1b97) |
| #define IS_SUBL_SP(x) (x==0x7a37) |
| #define IS_MOVK_R5(x) (x==0x7905) |
| #define IS_SUB_R5SP(x) (x==0x1957) |
| |
| |
| /* The register names change depending on whether the h8300h processor |
| type is selected. */ |
| |
| static char *original_register_names[] = REGISTER_NAMES; |
| |
| static char *h8300h_register_names[] = |
| {"er0", "er1", "er2", "er3", "er4", "er5", "er6", |
| "sp", "ccr", "pc", "cycles", "tick", "inst"}; |
| |
| char **h8300_register_names = original_register_names; |
| |
| |
| /* Local function declarations. */ |
| |
| static CORE_ADDR examine_prologue (); |
| static void set_machine_hook (char *filename); |
| |
| CORE_ADDR |
| h8300_skip_prologue (CORE_ADDR start_pc) |
| { |
| short int w; |
| int adjust = 0; |
| |
| /* Skip past all push and stm insns. */ |
| while (1) |
| { |
| w = read_memory_unsigned_integer (start_pc, 2); |
| /* First look for push insns. */ |
| if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130) |
| { |
| w = read_memory_unsigned_integer (start_pc + 2, 2); |
| adjust = 2; |
| } |
| |
| if (IS_PUSH (w)) |
| { |
| start_pc += 2 + adjust; |
| w = read_memory_unsigned_integer (start_pc, 2); |
| continue; |
| } |
| adjust = 0; |
| break; |
| } |
| |
| /* Skip past a move to FP, either word or long sized */ |
| w = read_memory_unsigned_integer (start_pc, 2); |
| if (w == 0x0100) |
| { |
| w = read_memory_unsigned_integer (start_pc + 2, 2); |
| adjust += 2; |
| } |
| |
| if (IS_MOVE_FP (w)) |
| { |
| start_pc += 2 + adjust; |
| w = read_memory_unsigned_integer (start_pc, 2); |
| } |
| |
| /* Check for loading either a word constant into r5; |
| long versions are handled by the SUBL_SP below. */ |
| if (IS_MOVK_R5 (w)) |
| { |
| start_pc += 2; |
| w = read_memory_unsigned_integer (start_pc, 2); |
| } |
| |
| /* Now check for subtracting r5 from sp, word sized only. */ |
| if (IS_SUB_R5SP (w)) |
| { |
| start_pc += 2 + adjust; |
| w = read_memory_unsigned_integer (start_pc, 2); |
| } |
| |
| /* Check for subs #2 and subs #4. */ |
| while (IS_SUB2_SP (w) || IS_SUB4_SP (w)) |
| { |
| start_pc += 2 + adjust; |
| w = read_memory_unsigned_integer (start_pc, 2); |
| } |
| |
| /* Check for a 32bit subtract. */ |
| if (IS_SUBL_SP (w)) |
| start_pc += 6 + adjust; |
| |
| return start_pc; |
| } |
| |
| int |
| gdb_print_insn_h8300 (bfd_vma memaddr, disassemble_info *info) |
| { |
| if (h8300smode) |
| return print_insn_h8300s (memaddr, info); |
| else if (h8300hmode) |
| return print_insn_h8300h (memaddr, info); |
| else |
| return print_insn_h8300 (memaddr, info); |
| } |
| |
| /* 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 |
| h8300_frame_chain (struct frame_info *thisframe) |
| { |
| if (PC_IN_CALL_DUMMY (thisframe->pc, thisframe->frame, thisframe->frame)) |
| { /* initialize the from_pc now */ |
| thisframe->from_pc = generic_read_register_dummy (thisframe->pc, |
| thisframe->frame, |
| PC_REGNUM); |
| return thisframe->frame; |
| } |
| h8300_frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0); |
| return thisframe->fsr->regs[SP_REGNUM]; |
| } |
| |
| /* 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_obstack, since it is |
| fairly expensive. */ |
| |
| void |
| h8300_frame_find_saved_regs (struct frame_info *fi, |
| struct frame_saved_regs *fsr) |
| { |
| register struct frame_saved_regs *cache_fsr; |
| CORE_ADDR ip; |
| struct symtab_and_line sal; |
| CORE_ADDR limit; |
| |
| if (!fi->fsr) |
| { |
| cache_fsr = (struct frame_saved_regs *) |
| frame_obstack_alloc (sizeof (struct frame_saved_regs)); |
| memset (cache_fsr, '\0', sizeof (struct frame_saved_regs)); |
| |
| fi->fsr = cache_fsr; |
| |
| if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| { /* no more to do. */ |
| if (fsr) |
| *fsr = *fi->fsr; |
| return; |
| } |
| /* Find the start and end of the function prologue. If the PC |
| is in the function prologue, we only consider the part that |
| has executed already. */ |
| |
| ip = get_pc_function_start (fi->pc); |
| sal = find_pc_line (ip, 0); |
| limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc; |
| |
| /* This will fill in fields in *fi as well as in cache_fsr. */ |
| examine_prologue (ip, limit, fi->frame, cache_fsr, fi); |
| } |
| |
| if (fsr) |
| *fsr = *fi->fsr; |
| } |
| |
| /* 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, INSN_WORD *pword1) |
| { |
| char buf[2]; |
| if (addr < lim + 8) |
| { |
| read_memory (addr, buf, 2); |
| *pword1 = extract_signed_integer (buf, 2); |
| |
| return addr + 2; |
| } |
| 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. */ |
| |
| static CORE_ADDR |
| examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit, |
| CORE_ADDR after_prolog_fp, struct frame_saved_regs *fsr, |
| struct frame_info *fi) |
| { |
| register CORE_ADDR next_ip; |
| int r; |
| int have_fp = 0; |
| INSN_WORD insn_word; |
| /* Number of things pushed onto stack, starts at 2/4, 'cause the |
| PC is already there */ |
| unsigned int reg_save_depth = h8300hmode ? 4 : 2; |
| |
| unsigned int auto_depth = 0; /* Number of bytes of autos */ |
| |
| char in_frame[11]; /* One for each reg */ |
| |
| int adjust = 0; |
| |
| memset (in_frame, 1, 11); |
| for (r = 0; r < 8; r++) |
| { |
| fsr->regs[r] = 0; |
| } |
| if (after_prolog_fp == 0) |
| { |
| after_prolog_fp = read_register (SP_REGNUM); |
| } |
| |
| /* If the PC isn't valid, quit now. */ |
| if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff)) |
| return 0; |
| |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| |
| if (insn_word == 0x0100) |
| { |
| insn_word = read_memory_unsigned_integer (ip + 2, 2); |
| adjust = 2; |
| } |
| |
| /* Skip over any fp push instructions */ |
| fsr->regs[6] = after_prolog_fp; |
| while (next_ip && IS_PUSH_FP (insn_word)) |
| { |
| ip = next_ip + adjust; |
| |
| in_frame[insn_word & 0x7] = reg_save_depth; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| reg_save_depth += 2 + adjust; |
| } |
| |
| /* Is this a move into the fp */ |
| if (next_ip && IS_MOV_SP_FP (insn_word)) |
| { |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| have_fp = 1; |
| } |
| |
| /* Skip over any stack adjustment, happens either with a number of |
| sub#2,sp or a mov #x,r5 sub r5,sp */ |
| |
| if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
| { |
| while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word))) |
| { |
| auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4; |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| } |
| } |
| else |
| { |
| if (next_ip && IS_MOVK_R5 (insn_word)) |
| { |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| auto_depth += insn_word; |
| |
| next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word); |
| auto_depth += insn_word; |
| } |
| if (next_ip && IS_SUBL_SP (insn_word)) |
| { |
| ip = next_ip; |
| auto_depth += read_memory_unsigned_integer (ip, 4); |
| ip += 4; |
| |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| } |
| } |
| |
| /* Now examine the push insns to determine where everything lives |
| on the stack. */ |
| while (1) |
| { |
| adjust = 0; |
| if (!next_ip) |
| break; |
| |
| if (insn_word == 0x0100) |
| { |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| adjust = 2; |
| } |
| |
| if (IS_PUSH (insn_word)) |
| { |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| fsr->regs[r] = after_prolog_fp + auto_depth; |
| auto_depth += 2 + adjust; |
| continue; |
| } |
| |
| /* Now check for push multiple insns. */ |
| if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130) |
| { |
| int count = ((insn_word >> 4) & 0xf) + 1; |
| int start, i; |
| |
| ip = next_ip; |
| next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word); |
| start = insn_word & 0x7; |
| |
| for (i = start; i <= start + count; i++) |
| { |
| fsr->regs[i] = after_prolog_fp + auto_depth; |
| auto_depth += 4; |
| } |
| } |
| break; |
| } |
| |
| /* The args are always reffed based from the stack pointer */ |
| fi->args_pointer = after_prolog_fp; |
| /* Locals are always reffed based from the fp */ |
| fi->locals_pointer = after_prolog_fp; |
| /* The PC is at a known place */ |
| fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD); |
| |
| /* Rememeber any others too */ |
| in_frame[PC_REGNUM] = 0; |
| |
| if (have_fp) |
| /* We keep the old FP in the SP spot */ |
| fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD); |
| else |
| fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth; |
| |
| return (ip); |
| } |
| |
| void |
| h8300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| { |
| fi->fsr = 0; /* Not yet allocated */ |
| fi->args_pointer = 0; /* Unknown */ |
| fi->locals_pointer = 0; /* Unknown */ |
| fi->from_pc = 0; |
| if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| { /* anything special to do? */ |
| return; |
| } |
| } |
| |
| /* 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 |
| h8300_frame_saved_pc (struct frame_info *frame) |
| { |
| if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
| return generic_read_register_dummy (frame->pc, frame->frame, PC_REGNUM); |
| else |
| return frame->from_pc; |
| } |
| |
| CORE_ADDR |
| h8300_frame_locals_address (struct frame_info *fi) |
| { |
| if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| return (CORE_ADDR) 0; /* Not sure what else to do... */ |
| if (!fi->locals_pointer) |
| { |
| struct frame_saved_regs ignore; |
| |
| get_frame_saved_regs (fi, &ignore); |
| |
| } |
| return fi->locals_pointer; |
| } |
| |
| /* Return the address of the argument block for the frame |
| described by FI. Returns 0 if the address is unknown. */ |
| |
| CORE_ADDR |
| h8300_frame_args_address (struct frame_info *fi) |
| { |
| if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
| return (CORE_ADDR) 0; /* Not sure what else to do... */ |
| if (!fi->args_pointer) |
| { |
| struct frame_saved_regs ignore; |
| |
| get_frame_saved_regs (fi, &ignore); |
| |
| } |
| |
| return fi->args_pointer; |
| } |
| |
| /* Function: push_arguments |
| Setup the function arguments for calling a function in the inferior. |
| |
| On the Hitachi H8/300 architecture, there are three registers (R0 to R2) |
| which are dedicated for passing function arguments. Up to the first |
| three arguments (depending on size) may go into these registers. |
| The rest go on the stack. |
| |
| Arguments that are smaller than WORDSIZE bytes will still take up a |
| whole register or a whole WORDSIZE word on the stack, and will be |
| right-justified in the register or the stack word. This includes |
| chars and small aggregate types. Note that WORDSIZE depends on the |
| cpu type. |
| |
| Arguments that are larger than WORDSIZE bytes will be split between |
| two or more registers as available, but will NOT be split between a |
| register and the stack. |
| |
| An exceptional case exists for struct arguments (and possibly other |
| aggregates such as arrays) -- if the size is larger than WORDSIZE |
| bytes but not a multiple of WORDSIZE bytes. In this case the |
| argument is never split between the registers and the stack, but |
| instead is copied in its entirety onto the stack, AND also copied |
| into as many registers as there is room for. In other words, space |
| in registers permitting, two copies of the same argument are passed |
| in. As far as I can tell, only the one on the stack is used, |
| although that may be a function of the level of compiler |
| optimization. I suspect this is a compiler bug. Arguments of |
| these odd sizes are left-justified within the word (as opposed to |
| arguments smaller than WORDSIZE bytes, which are right-justified). |
| |
| If the function is to return an aggregate type such as a struct, |
| the caller must allocate space into which the callee will copy the |
| return value. In this case, a pointer to the return value location |
| is passed into the callee in register R0, which displaces one of |
| the other arguments passed in via registers R0 to R2. */ |
| |
| CORE_ADDR |
| h8300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| unsigned char struct_return, CORE_ADDR struct_addr) |
| { |
| int stack_align, stack_alloc, stack_offset; |
| int wordsize; |
| int argreg; |
| int argnum; |
| struct type *type; |
| CORE_ADDR regval; |
| char *val; |
| char valbuf[4]; |
| int len; |
| |
| if (h8300hmode || h8300smode) |
| { |
| stack_align = 3; |
| wordsize = 4; |
| } |
| else |
| { |
| stack_align = 1; |
| wordsize = 2; |
| } |
| |
| /* first force sp to a n-byte alignment */ |
| sp = sp & ~stack_align; |
| |
| /* Now make sure there's space on the stack */ |
| for (argnum = 0, stack_alloc = 0; |
| argnum < nargs; argnum++) |
| stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + stack_align) |
| & ~stack_align); |
| sp -= stack_alloc; /* make room on stack for args */ |
| /* we may over-allocate a little here, but that won't hurt anything */ |
| |
| argreg = ARG0_REGNUM; |
| if (struct_return) /* "struct return" pointer takes up one argreg */ |
| { |
| write_register (argreg++, struct_addr); |
| } |
| |
| /* Now load as many as possible of the first arguments into |
| registers, and push the rest onto the stack. There are 3N bytes |
| in three registers available. Loop thru args from first to last. */ |
| |
| for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) |
| { |
| type = VALUE_TYPE (args[argnum]); |
| len = TYPE_LENGTH (type); |
| memset (valbuf, 0, sizeof (valbuf)); |
| if (len < wordsize) |
| { |
| /* the purpose of this is to right-justify the value within the word */ |
| memcpy (valbuf + (wordsize - len), |
| (char *) VALUE_CONTENTS (args[argnum]), len); |
| val = valbuf; |
| } |
| else |
| val = (char *) VALUE_CONTENTS (args[argnum]); |
| |
| if (len > (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM) || |
| (len > wordsize && (len & stack_align) != 0)) |
| { /* passed on the stack */ |
| write_memory (sp + stack_offset, val, |
| len < wordsize ? wordsize : len); |
| stack_offset += (len + stack_align) & ~stack_align; |
| } |
| /* NOTE WELL!!!!! This is not an "else if" clause!!! |
| That's because some *&^%$ things get passed on the stack |
| AND in the registers! */ |
| if (len <= (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM)) |
| while (len > 0) |
| { /* there's room in registers */ |
| regval = extract_address (val, wordsize); |
| write_register (argreg, regval); |
| len -= wordsize; |
| val += wordsize; |
| argreg++; |
| } |
| } |
| return sp; |
| } |
| |
| /* Function: push_return_address |
| Setup the return address for a dummy frame, as called by |
| call_function_by_hand. Only necessary when you are using an |
| empty CALL_DUMMY, ie. the target will not actually be executing |
| a JSR/BSR instruction. */ |
| |
| CORE_ADDR |
| h8300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| { |
| unsigned char buf[4]; |
| int wordsize; |
| |
| if (h8300hmode || h8300smode) |
| wordsize = 4; |
| else |
| wordsize = 2; |
| |
| sp -= wordsize; |
| store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ()); |
| write_memory (sp, buf, wordsize); |
| return sp; |
| } |
| |
| /* Function: h8300_pop_frame |
| Restore the machine to the state it had before the current frame |
| was created. Usually used either by the "RETURN" command, or by |
| call_function_by_hand after the dummy_frame is finished. */ |
| |
| void |
| h8300_pop_frame (void) |
| { |
| unsigned regnum; |
| struct frame_saved_regs fsr; |
| struct frame_info *frame = get_current_frame (); |
| |
| if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
| { |
| generic_pop_dummy_frame (); |
| } |
| else |
| { |
| get_frame_saved_regs (frame, &fsr); |
| |
| for (regnum = 0; regnum < 8; regnum++) |
| { |
| /* Don't forget SP_REGNUM is a frame_saved_regs struct is the |
| actual value we want, not the address of the value we want. */ |
| if (fsr.regs[regnum] && regnum != SP_REGNUM) |
| write_register (regnum, |
| read_memory_integer (fsr.regs[regnum], BINWORD)); |
| else if (fsr.regs[regnum] && regnum == SP_REGNUM) |
| write_register (regnum, frame->frame + 2 * BINWORD); |
| } |
| |
| /* Don't forget the update the PC too! */ |
| write_pc (frame->from_pc); |
| } |
| flush_cached_frames (); |
| } |
| |
| /* Function: extract_return_value |
| Figure out where in REGBUF the called function has left its return value. |
| Copy that into VALBUF. Be sure to account for CPU type. */ |
| |
| void |
| h8300_extract_return_value (struct type *type, char *regbuf, char *valbuf) |
| { |
| int wordsize, len; |
| |
| if (h8300smode || h8300hmode) |
| wordsize = 4; |
| else |
| wordsize = 2; |
| |
| len = TYPE_LENGTH (type); |
| |
| switch (len) |
| { |
| case 1: /* (char) */ |
| case 2: /* (short), (int) */ |
| memcpy (valbuf, regbuf + REGISTER_BYTE (0) + (wordsize - len), len); |
| break; |
| case 4: /* (long), (float) */ |
| if (h8300smode || h8300hmode) |
| { |
| memcpy (valbuf, regbuf + REGISTER_BYTE (0), 4); |
| } |
| else |
| { |
| memcpy (valbuf, regbuf + REGISTER_BYTE (0), 2); |
| memcpy (valbuf + 2, regbuf + REGISTER_BYTE (1), 2); |
| } |
| break; |
| case 8: /* (double) (doesn't seem to happen, which is good, |
| because this almost certainly isn't right. */ |
| error ("I don't know how a double is returned."); |
| break; |
| } |
| } |
| |
| /* Function: store_return_value |
| Place the appropriate value in the appropriate registers. |
| Primarily used by the RETURN command. */ |
| |
| void |
| h8300_store_return_value (struct type *type, char *valbuf) |
| { |
| int wordsize, len, regval; |
| |
| if (h8300hmode || h8300smode) |
| wordsize = 4; |
| else |
| wordsize = 2; |
| |
| len = TYPE_LENGTH (type); |
| switch (len) |
| { |
| case 1: /* char */ |
| case 2: /* short, int */ |
| regval = extract_address (valbuf, len); |
| write_register (0, regval); |
| break; |
| case 4: /* long, float */ |
| regval = extract_address (valbuf, len); |
| if (h8300smode || h8300hmode) |
| { |
| write_register (0, regval); |
| } |
| else |
| { |
| write_register (0, regval >> 16); |
| write_register (1, regval & 0xffff); |
| } |
| break; |
| case 8: /* presumeably double, but doesn't seem to happen */ |
| error ("I don't know how to return a double."); |
| break; |
| } |
| } |
| |
| struct cmd_list_element *setmemorylist; |
| |
| static void |
| set_register_names (void) |
| { |
| if (h8300hmode != 0) |
| h8300_register_names = h8300h_register_names; |
| else |
| h8300_register_names = original_register_names; |
| } |
| |
| static void |
| h8300_command (char *args, int from_tty) |
| { |
| extern int h8300hmode; |
| h8300hmode = 0; |
| h8300smode = 0; |
| set_register_names (); |
| } |
| |
| static void |
| h8300h_command (char *args, int from_tty) |
| { |
| extern int h8300hmode; |
| h8300hmode = 1; |
| h8300smode = 0; |
| set_register_names (); |
| } |
| |
| static void |
| h8300s_command (char *args, int from_tty) |
| { |
| extern int h8300smode; |
| extern int h8300hmode; |
| h8300smode = 1; |
| h8300hmode = 1; |
| set_register_names (); |
| } |
| |
| |
| static void |
| set_machine (char *args, int from_tty) |
| { |
| printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h"); |
| printf_unfiltered ("or h8300s"); |
| help_list (setmemorylist, "set memory ", -1, gdb_stdout); |
| } |
| |
| /* set_machine_hook is called as the exec file is being opened, but |
| before the symbol file is opened. This allows us to set the |
| h8300hmode flag based on the machine type specified in the exec |
| file. This in turn will cause subsequently defined pointer types |
| to be 16 or 32 bits as appropriate for the machine. */ |
| |
| static void |
| set_machine_hook (char *filename) |
| { |
| if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s) |
| { |
| h8300smode = 1; |
| h8300hmode = 1; |
| } |
| else if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h) |
| { |
| h8300smode = 0; |
| h8300hmode = 1; |
| } |
| else |
| { |
| h8300smode = 0; |
| h8300hmode = 0; |
| } |
| set_register_names (); |
| } |
| |
| void |
| _initialize_h8300m (void) |
| { |
| add_prefix_cmd ("machine", no_class, set_machine, |
| "set the machine type", |
| &setmemorylist, "set machine ", 0, |
| &setlist); |
| |
| add_cmd ("h8300", class_support, h8300_command, |
| "Set machine to be H8/300.", &setmemorylist); |
| |
| add_cmd ("h8300h", class_support, h8300h_command, |
| "Set machine to be H8/300H.", &setmemorylist); |
| |
| add_cmd ("h8300s", class_support, h8300s_command, |
| "Set machine to be H8/300S.", &setmemorylist); |
| |
| /* Add a hook to set the machine type when we're loading a file. */ |
| |
| specify_exec_file_hook (set_machine_hook); |
| } |
| |
| |
| |
| void |
| h8300_print_register_hook (int regno) |
| { |
| if (regno == 8) |
| { |
| /* CCR register */ |
| int C, Z, N, V; |
| unsigned char b[4]; |
| unsigned char l; |
| read_relative_register_raw_bytes (regno, b); |
| l = b[REGISTER_VIRTUAL_SIZE (8) - 1]; |
| printf_unfiltered ("\t"); |
| printf_unfiltered ("I-%d - ", (l & 0x80) != 0); |
| printf_unfiltered ("H-%d - ", (l & 0x20) != 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 ("<= "); |
| } |
| } |
| |
| void |
| _initialize_h8300_tdep (void) |
| { |
| tm_print_insn = gdb_print_insn_h8300; |
| } |