X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fm32r-tdep.c;h=b9556fac9dd79bee99dc8f4d84782d8431c2b844;hb=852164b6e8c92597cd72b08061808bdace471f7e;hp=476dcf3785d3e9b36a4aaecab0f0c1450e05d8d1;hpb=c5aa993b1f4add48fbdc6cc3117059f616e49875;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/m32r-tdep.c b/gdb/m32r-tdep.c index 476dcf3785..b9556fac9d 100644 --- a/gdb/m32r-tdep.c +++ b/gdb/m32r-tdep.c @@ -1,11 +1,13 @@ -/* Target-dependent code for the Mitsubishi m32r for GDB, the GNU debugger. - Copyright 1996, Free Software Foundation, Inc. +/* Target-dependent code for Renesas M32R, for GDB. + + Copyright (C) 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, + 2008, 2009 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 + the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -14,170 +16,327 @@ 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. */ + along with this program. If not, see . */ #include "defs.h" #include "frame.h" -#include "inferior.h" -#include "obstack.h" -#include "target.h" -#include "value.h" -#include "bfd.h" -#include "gdb_string.h" +#include "frame-unwind.h" +#include "frame-base.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "gdbcmd.h" #include "gdbcore.h" +#include "gdb_string.h" +#include "value.h" +#include "inferior.h" #include "symfile.h" +#include "objfiles.h" +#include "osabi.h" +#include "language.h" +#include "arch-utils.h" +#include "regcache.h" +#include "trad-frame.h" +#include "dis-asm.h" + +#include "gdb_assert.h" -/* Function: m32r_use_struct_convention - Return nonzero if call_function should allocate stack space for a - struct return? */ -int -m32r_use_struct_convention (gcc_p, type) - int gcc_p; - struct type *type; +#include "m32r-tdep.h" + +/* Local functions */ + +extern void _initialize_m32r_tdep (void); + +static CORE_ADDR +m32r_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) { - return (TYPE_LENGTH (type) > 8); + /* Align to the size of an instruction (so that they can safely be + pushed onto the stack. */ + return sp & ~3; } -/* Function: frame_find_saved_regs - Return the frame_saved_regs structure for the frame. - Doesn't really work for dummy frames, but it does pass back - an empty frame_saved_regs, so I guess that's better than total failure */ -void -m32r_frame_find_saved_regs (fi, regaddr) - struct frame_info *fi; - struct frame_saved_regs *regaddr; +/* Breakpoints + + The little endian mode of M32R is unique. In most of architectures, + two 16-bit instructions, A and B, are placed as the following: + + Big endian: + A0 A1 B0 B1 + + Little endian: + A1 A0 B1 B0 + + In M32R, they are placed like this: + + Big endian: + A0 A1 B0 B1 + + Little endian: + B1 B0 A1 A0 + + This is because M32R always fetches instructions in 32-bit. + + The following functions take care of this behavior. */ + +static int +m32r_memory_insert_breakpoint (struct gdbarch *gdbarch, + struct bp_target_info *bp_tgt) { - memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs)); + CORE_ADDR addr = bp_tgt->placed_address; + int val; + gdb_byte buf[4]; + gdb_byte *contents_cache = bp_tgt->shadow_contents; + gdb_byte bp_entry[] = { 0x10, 0xf1 }; /* dpt */ + + /* Save the memory contents. */ + val = target_read_memory (addr & 0xfffffffc, contents_cache, 4); + if (val != 0) + return val; /* return error */ + + bp_tgt->placed_size = bp_tgt->shadow_len = 4; + + /* Determine appropriate breakpoint contents and size for this address. */ + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) + { + if ((addr & 3) == 0) + { + buf[0] = bp_entry[0]; + buf[1] = bp_entry[1]; + buf[2] = contents_cache[2] & 0x7f; + buf[3] = contents_cache[3]; + } + else + { + buf[0] = contents_cache[0]; + buf[1] = contents_cache[1]; + buf[2] = bp_entry[0]; + buf[3] = bp_entry[1]; + } + } + else /* little-endian */ + { + if ((addr & 3) == 0) + { + buf[0] = contents_cache[0]; + buf[1] = contents_cache[1] & 0x7f; + buf[2] = bp_entry[1]; + buf[3] = bp_entry[0]; + } + else + { + buf[0] = bp_entry[1]; + buf[1] = bp_entry[0]; + buf[2] = contents_cache[2]; + buf[3] = contents_cache[3]; + } + } + + /* Write the breakpoint. */ + val = target_write_memory (addr & 0xfffffffc, buf, 4); + return val; } -/* Turn this on if you want to see just how much instruction decoding - if being done, its quite a lot - */ -#if 0 -static void -dump_insn (char *commnt, CORE_ADDR pc, int insn) +static int +m32r_memory_remove_breakpoint (struct gdbarch *gdbarch, + struct bp_target_info *bp_tgt) +{ + CORE_ADDR addr = bp_tgt->placed_address; + int val; + gdb_byte buf[4]; + gdb_byte *contents_cache = bp_tgt->shadow_contents; + + buf[0] = contents_cache[0]; + buf[1] = contents_cache[1]; + buf[2] = contents_cache[2]; + buf[3] = contents_cache[3]; + + /* Remove parallel bit. */ + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) + { + if ((buf[0] & 0x80) == 0 && (buf[2] & 0x80) != 0) + buf[2] &= 0x7f; + } + else /* little-endian */ + { + if ((buf[3] & 0x80) == 0 && (buf[1] & 0x80) != 0) + buf[1] &= 0x7f; + } + + /* Write contents. */ + val = target_write_memory (addr & 0xfffffffc, buf, 4); + return val; +} + +static const gdb_byte * +m32r_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) +{ + static gdb_byte be_bp_entry[] = { 0x10, 0xf1, 0x70, 0x00 }; /* dpt -> nop */ + static gdb_byte le_bp_entry[] = { 0x00, 0x70, 0xf1, 0x10 }; /* dpt -> nop */ + gdb_byte *bp; + + /* Determine appropriate breakpoint. */ + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) + { + if ((*pcptr & 3) == 0) + { + bp = be_bp_entry; + *lenptr = 4; + } + else + { + bp = be_bp_entry; + *lenptr = 2; + } + } + else + { + if ((*pcptr & 3) == 0) + { + bp = le_bp_entry; + *lenptr = 4; + } + else + { + bp = le_bp_entry + 2; + *lenptr = 2; + } + } + + return bp; +} + + +char *m32r_register_names[] = { + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", + "r8", "r9", "r10", "r11", "r12", "fp", "lr", "sp", + "psw", "cbr", "spi", "spu", "bpc", "pc", "accl", "acch", + "evb" +}; + +static const char * +m32r_register_name (struct gdbarch *gdbarch, int reg_nr) { - printf_filtered (" %s %08x %08x ", - commnt, (unsigned int) pc, (unsigned int) insn); - (*tm_print_insn) (pc, &tm_print_insn_info); - printf_filtered ("\n"); + if (reg_nr < 0) + return NULL; + if (reg_nr >= M32R_NUM_REGS) + return NULL; + return m32r_register_names[reg_nr]; } -#define insn_debug(args) { printf_filtered args; } -#else -#define dump_insn(a,b,c) {} -#define insn_debug(args) {} -#endif - -#define DEFAULT_SEARCH_LIMIT 44 - -/* Function: scan_prologue - This function decodes the target function prologue to determine - 1) the size of the stack frame, and 2) which registers are saved on it. - It saves the offsets of saved regs in the frame_saved_regs argument, - and returns the frame size. */ - -/* - The sequence it currently generates is: - - if (varargs function) { ddi sp,#n } - push registers - if (additional stack <= 256) { addi sp,#-stack } - else if (additional stack < 65k) { add3 sp,sp,#-stack - - } else if (additional stack) { - seth sp,#(stack & 0xffff0000) - or3 sp,sp,#(stack & 0x0000ffff) - sub sp,r4 - } - if (frame pointer) { - mv sp,fp - } - - These instructions are scheduled like everything else, so you should stop at - the first branch instruction. - - */ - -/* This is required by skip prologue and by m32r_init_extra_frame_info. - The results of decoding a prologue should be cached because this - thrashing is getting nuts. - I am thinking of making a container class with two indexes, name and - address. It may be better to extend the symbol table. - */ + + +/* Return the GDB type object for the "standard" data type + of data in register N. */ + +static struct type * +m32r_register_type (struct gdbarch *gdbarch, int reg_nr) +{ + if (reg_nr == M32R_PC_REGNUM) + return builtin_type (gdbarch)->builtin_func_ptr; + else if (reg_nr == M32R_SP_REGNUM || reg_nr == M32R_FP_REGNUM) + return builtin_type (gdbarch)->builtin_data_ptr; + else + return builtin_type (gdbarch)->builtin_int32; +} + + +/* Write into appropriate registers a function return value + of type TYPE, given in virtual format. + + Things always get returned in RET1_REGNUM, RET2_REGNUM. */ static void -decode_prologue (start_pc, scan_limit, - pl_endptr, framelength, - fi, fsr) - CORE_ADDR start_pc; - CORE_ADDR scan_limit; - CORE_ADDR *pl_endptr; /* var parameter */ - unsigned long *framelength; - struct frame_info *fi; - struct frame_saved_regs *fsr; +m32r_store_return_value (struct type *type, struct regcache *regcache, + const void *valbuf) +{ + struct gdbarch *gdbarch = get_regcache_arch (regcache); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + CORE_ADDR regval; + int len = TYPE_LENGTH (type); + + regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len, byte_order); + regcache_cooked_write_unsigned (regcache, RET1_REGNUM, regval); + + if (len > 4) + { + regval = extract_unsigned_integer ((gdb_byte *) valbuf + 4, + len - 4, byte_order); + regcache_cooked_write_unsigned (regcache, RET1_REGNUM + 1, regval); + } +} + +/* This is required by skip_prologue. The results of decoding a prologue + should be cached because this thrashing is getting nuts. */ + +static int +decode_prologue (struct gdbarch *gdbarch, + CORE_ADDR start_pc, CORE_ADDR scan_limit, + CORE_ADDR *pl_endptr, unsigned long *framelength) { + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); unsigned long framesize; int insn; int op1; - int maybe_one_more = 0; CORE_ADDR after_prologue = 0; + CORE_ADDR after_push = 0; CORE_ADDR after_stack_adjust = 0; CORE_ADDR current_pc; - + LONGEST return_value; framesize = 0; after_prologue = 0; - insn_debug (("rd prolog l(%d)\n", scan_limit - current_pc)); for (current_pc = start_pc; current_pc < scan_limit; current_pc += 2) { + /* Check if current pc's location is readable. */ + if (!safe_read_memory_integer (current_pc, 2, byte_order, &return_value)) + return -1; - insn = read_memory_unsigned_integer (current_pc, 2); - dump_insn ("insn-1", current_pc, insn); /* MTZ */ + insn = read_memory_unsigned_integer (current_pc, 2, byte_order); + + if (insn == 0x0000) + break; /* If this is a 32 bit instruction, we dont want to examine its immediate data as though it were an instruction */ if (current_pc & 0x02) - { /* Clear the parallel execution bit from 16 bit instruction */ - if (maybe_one_more) - { /* The last instruction was a branch, usually terminates - the series, but if this is a parallel instruction, - it may be a stack framing instruction */ - if (!(insn & 0x8000)) - { - insn_debug (("Really done")); - break; /* nope, we are really done */ - } - } - insn &= 0x7fff; /* decode this instruction further */ + { + /* decode this instruction further */ + insn &= 0x7fff; } else { - if (maybe_one_more) - break; /* This isnt the one more */ if (insn & 0x8000) { - insn_debug (("32 bit insn\n")); if (current_pc == scan_limit) scan_limit += 2; /* extend the search */ + current_pc += 2; /* skip the immediate data */ + + /* Check if current pc's location is readable. */ + if (!safe_read_memory_integer (current_pc, 2, byte_order, + &return_value)) + return -1; + if (insn == 0x8faf) /* add3 sp, sp, xxxx */ /* add 16 bit sign-extended offset */ { - insn_debug (("stack increment\n")); - framesize += -((short) read_memory_unsigned_integer (current_pc, 2)); + framesize += + -((short) read_memory_unsigned_integer (current_pc, + 2, byte_order)); } else { - if (((insn >> 8) == 0xe4) && /* ld24 r4, xxxxxx; sub sp, r4 */ - read_memory_unsigned_integer (current_pc + 2, 2) == 0x0f24) - { /* subtract 24 bit sign-extended negative-offset */ - dump_insn ("insn-2", current_pc + 2, insn); - insn = read_memory_unsigned_integer (current_pc - 2, 4); - dump_insn ("insn-3(l4)", current_pc - 2, insn); + if (((insn >> 8) == 0xe4) /* ld24 r4, xxxxxx; sub sp, r4 */ + && safe_read_memory_integer (current_pc + 2, + 2, byte_order, + &return_value) + && read_memory_unsigned_integer (current_pc + 2, + 2, byte_order) + == 0x0f24) + /* subtract 24 bit sign-extended negative-offset */ + { + insn = read_memory_unsigned_integer (current_pc - 2, + 4, byte_order); if (insn & 0x00800000) /* sign extend */ insn |= 0xff000000; /* negative */ else @@ -185,7 +344,7 @@ decode_prologue (start_pc, scan_limit, framesize += insn; } } - after_prologue = current_pc; + after_push = current_pc + 2; continue; } } @@ -194,29 +353,15 @@ decode_prologue (start_pc, scan_limit, if ((insn & 0xf0ff) == 0x207f) { /* st reg, @-sp */ int regno; - insn_debug (("push\n")); -#if 0 /* No, PUSH FP is not an indication that we will use a frame pointer. */ - if (((insn & 0xffff) == 0x2d7f) && fi) - fi->using_frame_pointer = 1; -#endif framesize += 4; -#if 0 -/* Why should we increase the scan limit, just because we did a push? - And if there is a reason, surely we would only want to do it if we - had already reached the scan limit... */ - if (current_pc == scan_limit) - scan_limit += 2; -#endif regno = ((insn >> 8) & 0xf); - if (fsr) /* save_regs offset */ - fsr->regs[regno] = framesize; after_prologue = 0; continue; } if ((insn >> 8) == 0x4f) /* addi sp, xx */ /* add 8 bit sign-extended offset */ { - int stack_adjust = (char) (insn & 0xff); + int stack_adjust = (signed char) (insn & 0xff); /* there are probably two of these stack adjustments: 1) A negative one in the prologue, and @@ -235,26 +380,26 @@ decode_prologue (start_pc, scan_limit, } if (insn == 0x1d8f) { /* mv fp, sp */ - if (fi) - fi->using_frame_pointer = 1; /* fp is now valid */ - insn_debug (("done fp found\n")); after_prologue = current_pc + 2; break; /* end of stack adjustments */ } - if (insn == 0x7000) /* Nop looks like a branch, continue explicitly */ + + /* Nop looks like a branch, continue explicitly */ + if (insn == 0x7000) { - insn_debug (("nop\n")); after_prologue = current_pc + 2; continue; /* nop occurs between pushes */ } + /* End of prolog if any of these are trap instructions */ + if ((insn & 0xfff0) == 0x10f0) + { + after_prologue = current_pc; + break; + } /* End of prolog if any of these are branch instructions */ - if ((op1 == 0x7000) - || (op1 == 0xb000) - || (op1 == 0x7000)) + if ((op1 == 0x7000) || (op1 == 0xb000) || (op1 == 0xf000)) { after_prologue = current_pc; - insn_debug (("Done: branch\n")); - maybe_one_more = 1; continue; } /* Some of the branch instructions are mixed with other types */ @@ -263,57 +408,64 @@ decode_prologue (start_pc, scan_limit, int subop = insn & 0x0ff0; if ((subop == 0x0ec0) || (subop == 0x0fc0)) { - insn_debug (("done: jmp\n")); after_prologue = current_pc; - maybe_one_more = 1; continue; /* jmp , jl */ } } } + if (framelength) + *framelength = framesize; + if (current_pc >= scan_limit) { if (pl_endptr) { -#if 1 if (after_stack_adjust != 0) /* We did not find a "mv fp,sp", but we DID find a stack_adjust. Is it safe to use that as the end of the prologue? I just don't know. */ { *pl_endptr = after_stack_adjust; - if (framelength) - *framelength = framesize; + } + else if (after_push != 0) + /* We did not find a "mv fp,sp", but we DID find + a push. Is it safe to use that as the + end of the prologue? I just don't know. */ + { + *pl_endptr = after_push; } else -#endif /* We reached the end of the loop without finding the end of the prologue. No way to win -- we should report failure. The way we do that is to return the original start_pc. GDB will set a breakpoint at the start of the function (etc.) */ *pl_endptr = start_pc; } - return; + return 0; } + if (after_prologue == 0) after_prologue = current_pc; - insn_debug ((" framesize %d, firstline %08x\n", framesize, after_prologue)); - if (framelength) - *framelength = framesize; if (pl_endptr) *pl_endptr = after_prologue; + + return 0; } /* decode_prologue */ /* Function: skip_prologue Find end of function prologue */ -CORE_ADDR -m32r_skip_prologue (pc) - CORE_ADDR pc; +#define DEFAULT_SEARCH_LIMIT 128 + +static CORE_ADDR +m32r_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) { + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); CORE_ADDR func_addr, func_end; struct symtab_and_line sal; + LONGEST return_value; /* See what the symbol table says */ @@ -323,8 +475,6 @@ m32r_skip_prologue (pc) if (sal.line != 0 && sal.end <= func_end) { - - insn_debug (("BP after prologue %08x\n", sal.end)); func_end = sal.end; } else @@ -332,407 +482,492 @@ m32r_skip_prologue (pc) the end of the function. In this case, there probably isn't a prologue. */ { - insn_debug (("No line info, line(%x) sal_end(%x) funcend(%x)\n", - sal.line, sal.end, func_end)); func_end = min (func_end, func_addr + DEFAULT_SEARCH_LIMIT); } } else func_end = pc + DEFAULT_SEARCH_LIMIT; - decode_prologue (pc, func_end, &sal.end, 0, 0, 0); - return sal.end; -} - -static unsigned long -m32r_scan_prologue (fi, fsr) - struct frame_info *fi; - struct frame_saved_regs *fsr; -{ - struct symtab_and_line sal; - CORE_ADDR prologue_start, prologue_end, current_pc; - unsigned long framesize; - /* this code essentially duplicates skip_prologue, - but we need the start address below. */ + /* If pc's location is not readable, just quit. */ + if (!safe_read_memory_integer (pc, 4, byte_order, &return_value)) + return pc; - if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) - { - sal = find_pc_line (prologue_start, 0); + /* Find the end of prologue. */ + if (decode_prologue (gdbarch, pc, func_end, &sal.end, NULL) < 0) + return pc; - if (sal.line == 0) /* no line info, use current PC */ - if (prologue_start == entry_point_address ()) - return 0; - } - else - { - prologue_start = fi->pc; - prologue_end = prologue_start + 48; /* We're in the boondocks: - allow for 16 pushes, an add, - and "mv fp,sp" */ - } -#if 0 - prologue_end = min (prologue_end, fi->pc); -#endif - insn_debug (("fipc(%08x) start(%08x) end(%08x)\n", - fi->pc, prologue_start, prologue_end)); - prologue_end = min (prologue_end, prologue_start + DEFAULT_SEARCH_LIMIT); - decode_prologue (prologue_start, prologue_end, &prologue_end, &framesize, - fi, fsr); - return framesize; + return sal.end; } -/* Function: init_extra_frame_info - This function actually figures out the frame address for a given pc and - sp. This is tricky on the m32r because we sometimes don't use an explicit - frame pointer, and the previous stack pointer isn't necessarily recorded - on the stack. The only reliable way to get this info is to - examine the prologue. */ - -void -m32r_init_extra_frame_info (fi) - struct frame_info *fi; +struct m32r_unwind_cache { - int reg; + /* The previous frame's inner most stack address. Used as this + frame ID's stack_addr. */ + CORE_ADDR prev_sp; + /* The frame's base, optionally used by the high-level debug info. */ + CORE_ADDR base; + int size; + /* How far the SP and r13 (FP) have been offset from the start of + the stack frame (as defined by the previous frame's stack + pointer). */ + LONGEST sp_offset; + LONGEST r13_offset; + int uses_frame; + /* Table indicating the location of each and every register. */ + struct trad_frame_saved_reg *saved_regs; +}; + +/* Put here the code to store, into fi->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. */ + +static struct m32r_unwind_cache * +m32r_frame_unwind_cache (struct frame_info *this_frame, + void **this_prologue_cache) +{ + CORE_ADDR pc, scan_limit; + ULONGEST prev_sp; + ULONGEST this_base; + unsigned long op, op2; + int i; + struct m32r_unwind_cache *info; - if (fi->next) - fi->pc = FRAME_SAVED_PC (fi->next); - memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); + if ((*this_prologue_cache)) + return (*this_prologue_cache); - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - { - /* We need to setup fi->frame here because run_stack_dummy gets it wrong - by assuming it's always FP. */ - fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); - fi->framesize = 0; - return; - } - else - { - fi->using_frame_pointer = 0; - fi->framesize = m32r_scan_prologue (fi, &fi->fsr); - - if (!fi->next) - if (fi->using_frame_pointer) - { - fi->frame = read_register (FP_REGNUM); - } - else - fi->frame = read_register (SP_REGNUM); - else - /* fi->next means this is not the innermost frame */ if (fi->using_frame_pointer) - /* we have an FP */ - if (fi->next->fsr.regs[FP_REGNUM] != 0) /* caller saved our FP */ - fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4); - for (reg = 0; reg < NUM_REGS; reg++) - if (fi->fsr.regs[reg] != 0) - fi->fsr.regs[reg] = fi->frame + fi->framesize - fi->fsr.regs[reg]; - } -} + info = FRAME_OBSTACK_ZALLOC (struct m32r_unwind_cache); + (*this_prologue_cache) = info; + info->saved_regs = trad_frame_alloc_saved_regs (this_frame); -/* Function: mn10300_virtual_frame_pointer - Return the register that the function uses for a frame pointer, - plus any necessary offset to be applied to the register before - any frame pointer offsets. */ + info->size = 0; + info->sp_offset = 0; + info->uses_frame = 0; -void -m32r_virtual_frame_pointer (pc, reg, offset) - CORE_ADDR pc; - long *reg; - long *offset; -{ - struct frame_info fi; + scan_limit = get_frame_pc (this_frame); + for (pc = get_frame_func (this_frame); + pc > 0 && pc < scan_limit; pc += 2) + { + if ((pc & 2) == 0) + { + op = get_frame_memory_unsigned (this_frame, pc, 4); + if ((op & 0x80000000) == 0x80000000) + { + /* 32-bit instruction */ + if ((op & 0xffff0000) == 0x8faf0000) + { + /* add3 sp,sp,xxxx */ + short n = op & 0xffff; + info->sp_offset += n; + } + else if (((op >> 8) == 0xe4) + && get_frame_memory_unsigned (this_frame, pc + 2, + 2) == 0x0f24) + { + /* ld24 r4, xxxxxx; sub sp, r4 */ + unsigned long n = op & 0xffffff; + info->sp_offset += n; + pc += 2; /* skip sub instruction */ + } - /* Set up a dummy frame_info. */ - fi.next = NULL; - fi.prev = NULL; - fi.frame = 0; - fi.pc = pc; + if (pc == scan_limit) + scan_limit += 2; /* extend the search */ + pc += 2; /* skip the immediate data */ + continue; + } + } - /* Analyze the prolog and fill in the extra info. */ - m32r_init_extra_frame_info (&fi); + /* 16-bit instructions */ + op = get_frame_memory_unsigned (this_frame, pc, 2) & 0x7fff; + if ((op & 0xf0ff) == 0x207f) + { + /* st rn, @-sp */ + int regno = ((op >> 8) & 0xf); + info->sp_offset -= 4; + info->saved_regs[regno].addr = info->sp_offset; + } + else if ((op & 0xff00) == 0x4f00) + { + /* addi sp, xx */ + int n = (signed char) (op & 0xff); + info->sp_offset += n; + } + else if (op == 0x1d8f) + { + /* mv fp, sp */ + info->uses_frame = 1; + info->r13_offset = info->sp_offset; + break; /* end of stack adjustments */ + } + else if ((op & 0xfff0) == 0x10f0) + { + /* end of prologue if this is a trap instruction */ + break; /* end of stack adjustments */ + } + } + info->size = -info->sp_offset; - /* Results will tell us which type of frame it uses. */ - if (fi.using_frame_pointer) + /* Compute the previous frame's stack pointer (which is also the + frame's ID's stack address), and this frame's base pointer. */ + if (info->uses_frame) { - *reg = FP_REGNUM; - *offset = 0; + /* The SP was moved to the FP. This indicates that a new frame + was created. Get THIS frame's FP value by unwinding it from + the next frame. */ + this_base = get_frame_register_unsigned (this_frame, M32R_FP_REGNUM); + /* The FP points at the last saved register. Adjust the FP back + to before the first saved register giving the SP. */ + prev_sp = this_base + info->size; } else { - *reg = SP_REGNUM; - *offset = 0; + /* Assume that the FP is this frame's SP but with that pushed + stack space added back. */ + this_base = get_frame_register_unsigned (this_frame, M32R_SP_REGNUM); + prev_sp = this_base + info->size; } -} -/* Function: find_callers_reg - Find REGNUM on the stack. Otherwise, it's in an active register. One thing - we might want to do here is to check REGNUM against the clobber mask, and - somehow flag it as invalid if it isn't saved on the stack somewhere. This - would provide a graceful failure mode when trying to get the value of - caller-saves registers for an inner frame. */ - -CORE_ADDR -m32r_find_callers_reg (fi, regnum) - struct frame_info *fi; - int regnum; -{ - for (; fi; fi = fi->next) - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - return generic_read_register_dummy (fi->pc, fi->frame, regnum); - else if (fi->fsr.regs[regnum] != 0) - return read_memory_integer (fi->fsr.regs[regnum], - REGISTER_RAW_SIZE (regnum)); - return read_register (regnum); -} + /* Convert that SP/BASE into real addresses. */ + info->prev_sp = prev_sp; + info->base = this_base; -/* Function: frame_chain - 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 m32r, we save the frame size when we initialize the frame_info. */ + /* Adjust all the saved registers so that they contain addresses and + not offsets. */ + for (i = 0; i < gdbarch_num_regs (get_frame_arch (this_frame)) - 1; i++) + if (trad_frame_addr_p (info->saved_regs, i)) + info->saved_regs[i].addr = (info->prev_sp + info->saved_regs[i].addr); -CORE_ADDR -m32r_frame_chain (fi) - struct frame_info *fi; -{ - CORE_ADDR fn_start, callers_pc, fp; - - /* is this a dummy frame? */ - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - return fi->frame; /* dummy frame same as caller's frame */ - - /* is caller-of-this a dummy frame? */ - callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ - fp = m32r_find_callers_reg (fi, FP_REGNUM); - if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) - return fp; /* dummy frame's frame may bear no relation to ours */ - - if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) - if (fn_start == entry_point_address ()) - return 0; /* in _start fn, don't chain further */ - if (fi->framesize == 0) - { - printf_filtered ("cannot determine frame size @ %08x , pc(%08x)\n", - (unsigned long) fi->frame, - (unsigned long) fi->pc); - return 0; - } - insn_debug (("m32rx frame %08x\n", fi->frame + fi->framesize)); - return fi->frame + fi->framesize; -} + /* The call instruction moves the caller's PC in the callee's LR. + Since this is an unwind, do the reverse. Copy the location of LR + into PC (the address / regnum) so that a request for PC will be + converted into a request for the LR. */ + info->saved_regs[M32R_PC_REGNUM] = info->saved_regs[LR_REGNUM]; -/* Function: push_return_address (pc) - Set up the return address for the inferior function call. - Necessary for targets that don't actually execute a JSR/BSR instruction - (ie. when using an empty CALL_DUMMY) */ + /* The previous frame's SP needed to be computed. Save the computed + value. */ + trad_frame_set_value (info->saved_regs, M32R_SP_REGNUM, prev_sp); -CORE_ADDR -m32r_push_return_address (pc, sp) - CORE_ADDR pc; - CORE_ADDR sp; -{ - write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); - return sp; + return info; } - -/* Function: pop_frame - Discard from the stack the innermost frame, - restoring all saved registers. */ - -struct frame_info * -m32r_pop_frame (frame) - struct frame_info *frame; +static CORE_ADDR +m32r_read_pc (struct regcache *regcache) { - int regnum; - - if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) - generic_pop_dummy_frame (); - else - { - for (regnum = 0; regnum < NUM_REGS; regnum++) - if (frame->fsr.regs[regnum] != 0) - write_register (regnum, - read_memory_integer (frame->fsr.regs[regnum], 4)); - - write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); - write_register (SP_REGNUM, read_register (FP_REGNUM)); - if (read_register (PSW_REGNUM) & 0x80) - write_register (SPU_REGNUM, read_register (SP_REGNUM)); - else - write_register (SPI_REGNUM, read_register (SP_REGNUM)); - } - flush_cached_frames (); - return NULL; + ULONGEST pc; + regcache_cooked_read_unsigned (regcache, M32R_PC_REGNUM, &pc); + return pc; } -/* Function: frame_saved_pc - Find the caller of this frame. We do this by seeing if RP_REGNUM is saved - in the stack anywhere, otherwise we get it from the registers. */ +static void +m32r_write_pc (struct regcache *regcache, CORE_ADDR val) +{ + regcache_cooked_write_unsigned (regcache, M32R_PC_REGNUM, val); +} -CORE_ADDR -m32r_frame_saved_pc (fi) - struct frame_info *fi; +static CORE_ADDR +m32r_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) { - if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) - return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); - else - return m32r_find_callers_reg (fi, RP_REGNUM); + return frame_unwind_register_unsigned (next_frame, M32R_SP_REGNUM); } -/* Function: push_arguments - Setup the function arguments for calling a function in the inferior. - - On the Mitsubishi M32R architecture, there are four registers (R0 to R3) - which are dedicated for passing function arguments. Up to the first - four arguments (depending on size) may go into these registers. - The rest go on the stack. - - Arguments that are smaller than 4 bytes will still take up a whole - register or a whole 32-bit word on the stack, and will be - right-justified in the register or the stack word. This includes - chars, shorts, and small aggregate types. - - Arguments of 8 bytes size are split between two registers, if - available. If only one register is available, the argument will - be split between the register and the stack. Otherwise it is - passed entirely on the stack. Aggregate types with sizes between - 4 and 8 bytes are passed entirely on the stack, and are left-justified - within the double-word (as opposed to aggregates smaller than 4 bytes - which are right-justified). - - Aggregates of greater than 8 bytes are first copied onto the stack, - and then a pointer to the copy is passed in the place of the normal - argument (either in a register if available, or on the stack). - - Functions that must return an aggregate type can return it in the - normal return value registers (R0 and R1) if its size is 8 bytes or - less. For larger return values, the caller must allocate space for - the callee to copy the return value to. A pointer to this space is - passed as an implicit first argument, always in R0. */ - -CORE_ADDR -m32r_push_arguments (nargs, args, sp, struct_return, struct_addr) - int nargs; - value_ptr *args; - CORE_ADDR sp; - unsigned char struct_return; - CORE_ADDR struct_addr; + +static CORE_ADDR +m32r_push_dummy_call (struct gdbarch *gdbarch, struct value *function, + struct regcache *regcache, CORE_ADDR bp_addr, int nargs, + struct value **args, CORE_ADDR sp, int struct_return, + CORE_ADDR struct_addr) { + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); int stack_offset, stack_alloc; - int argreg; + int argreg = ARG1_REGNUM; int argnum; struct type *type; + enum type_code typecode; CORE_ADDR regval; - char *val; - char valbuf[4]; + gdb_byte *val; + gdb_byte valbuf[MAX_REGISTER_SIZE]; int len; int odd_sized_struct; /* first force sp to a 4-byte alignment */ sp = sp & ~3; - argreg = ARG0_REGNUM; - /* The "struct return pointer" pseudo-argument goes in R0 */ + /* Set the return address. For the m32r, the return breakpoint is + always at BP_ADDR. */ + regcache_cooked_write_unsigned (regcache, LR_REGNUM, bp_addr); + + /* If STRUCT_RETURN is true, then the struct return address (in + STRUCT_ADDR) will consume the first argument-passing register. + Both adjust the register count and store that value. */ if (struct_return) - write_register (argreg++, struct_addr); + { + regcache_cooked_write_unsigned (regcache, argreg, struct_addr); + argreg++; + } /* 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])) + 3) & ~3); + for (argnum = 0, stack_alloc = 0; argnum < nargs; argnum++) + stack_alloc += ((TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3); sp -= stack_alloc; /* make room on stack for args */ - - /* Now load as many as possible of the first arguments into - registers, and push the rest onto the stack. There are 16 bytes - in four registers available. Loop thru args from first to last. */ - - argreg = ARG0_REGNUM; for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) { - type = VALUE_TYPE (args[argnum]); + type = value_type (args[argnum]); + typecode = TYPE_CODE (type); len = TYPE_LENGTH (type); + memset (valbuf, 0, sizeof (valbuf)); - if (len < 4) - { /* value gets right-justified in the register or stack word */ - memcpy (valbuf + (4 - len), - (char *) VALUE_CONTENTS (args[argnum]), len); + + /* Passes structures that do not fit in 2 registers by reference. */ + if (len > 8 + && (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)) + { + store_unsigned_integer (valbuf, 4, byte_order, + value_address (args[argnum])); + typecode = TYPE_CODE_PTR; + len = 4; + val = valbuf; + } + else if (len < 4) + { + /* value gets right-justified in the register or stack word */ + memcpy (valbuf + (register_size (gdbarch, argreg) - len), + (gdb_byte *) value_contents (args[argnum]), len); val = valbuf; } else - val = (char *) VALUE_CONTENTS (args[argnum]); + val = (gdb_byte *) value_contents (args[argnum]); - if (len > 4 && (len & 3) != 0) - odd_sized_struct = 1; /* such structs go entirely on stack */ - else - odd_sized_struct = 0; while (len > 0) { - if (argreg > ARGLAST_REGNUM || odd_sized_struct) - { /* must go on the stack */ + if (argreg > ARGN_REGNUM) + { + /* must go on the stack */ write_memory (sp + stack_offset, val, 4); stack_offset += 4; } - /* NOTE WELL!!!!! This is not an "else if" clause!!! - That's because some *&^%$ things get passed on the stack - AND in the registers! */ - if (argreg <= ARGLAST_REGNUM) - { /* there's room in a register */ - regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); - write_register (argreg++, regval); + else if (argreg <= ARGN_REGNUM) + { + /* there's room in a register */ + regval = + extract_unsigned_integer (val, + register_size (gdbarch, argreg), + byte_order); + regcache_cooked_write_unsigned (regcache, argreg++, regval); } + /* Store the value 4 bytes at a time. This means that things larger than 4 bytes may go partly in registers and partly on the stack. */ - len -= REGISTER_RAW_SIZE (argreg); - val += REGISTER_RAW_SIZE (argreg); + len -= register_size (gdbarch, argreg); + val += register_size (gdbarch, argreg); } } + + /* Finally, update the SP register. */ + regcache_cooked_write_unsigned (regcache, M32R_SP_REGNUM, sp); + return sp; } -/* Function: fix_call_dummy - If there is real CALL_DUMMY code (eg. on the stack), this function - has the responsability to insert the address of the actual code that - is the target of the target function call. */ -void -m32r_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) - char *dummy; - CORE_ADDR pc; - CORE_ADDR fun; - int nargs; - value_ptr *args; - struct type *type; - int gcc_p; +/* Given a return value in `regbuf' with a type `valtype', + extract and copy its value into `valbuf'. */ + +static void +m32r_extract_return_value (struct type *type, struct regcache *regcache, + void *dst) +{ + struct gdbarch *gdbarch = get_regcache_arch (regcache); + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + bfd_byte *valbuf = dst; + int len = TYPE_LENGTH (type); + ULONGEST tmp; + + /* By using store_unsigned_integer we avoid having to do + anything special for small big-endian values. */ + regcache_cooked_read_unsigned (regcache, RET1_REGNUM, &tmp); + store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), byte_order, tmp); + + /* Ignore return values more than 8 bytes in size because the m32r + returns anything more than 8 bytes in the stack. */ + if (len > 4) + { + regcache_cooked_read_unsigned (regcache, RET1_REGNUM + 1, &tmp); + store_unsigned_integer (valbuf + len - 4, 4, byte_order, tmp); + } +} + +static enum return_value_convention +m32r_return_value (struct gdbarch *gdbarch, struct type *func_type, + struct type *valtype, struct regcache *regcache, + gdb_byte *readbuf, const gdb_byte *writebuf) { - /* ld24 r8, <(imm24) fun> */ - *(unsigned long *) (dummy) = (fun & 0x00ffffff) | 0xe8000000; + if (TYPE_LENGTH (valtype) > 8) + return RETURN_VALUE_STRUCT_CONVENTION; + else + { + if (readbuf != NULL) + m32r_extract_return_value (valtype, regcache, readbuf); + if (writebuf != NULL) + m32r_store_return_value (valtype, regcache, writebuf); + return RETURN_VALUE_REGISTER_CONVENTION; + } } -/* Function: m32r_write_sp - Because SP is really a read-only register that mirrors either SPU or SPI, - we must actually write one of those two as well, depending on PSW. */ -void -m32r_write_sp (val) - CORE_ADDR val; +static CORE_ADDR +m32r_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) { - unsigned long psw = read_register (PSW_REGNUM); + return frame_unwind_register_unsigned (next_frame, M32R_PC_REGNUM); +} - if (psw & 0x80) /* stack mode: user or interrupt */ - write_register (SPU_REGNUM, val); - else - write_register (SPI_REGNUM, val); - write_register (SP_REGNUM, val); +/* Given a GDB frame, determine the address of the calling function's + frame. This will be used to create a new GDB frame struct. */ + +static void +m32r_frame_this_id (struct frame_info *this_frame, + void **this_prologue_cache, struct frame_id *this_id) +{ + struct m32r_unwind_cache *info + = m32r_frame_unwind_cache (this_frame, this_prologue_cache); + CORE_ADDR base; + CORE_ADDR func; + struct minimal_symbol *msym_stack; + struct frame_id id; + + /* The FUNC is easy. */ + func = get_frame_func (this_frame); + + /* Check if the stack is empty. */ + msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL); + if (msym_stack && info->base == SYMBOL_VALUE_ADDRESS (msym_stack)) + return; + + /* Hopefully the prologue analysis either correctly determined the + frame's base (which is the SP from the previous frame), or set + that base to "NULL". */ + base = info->prev_sp; + if (base == 0) + return; + + id = frame_id_build (base, func); + (*this_id) = id; +} + +static struct value * +m32r_frame_prev_register (struct frame_info *this_frame, + void **this_prologue_cache, int regnum) +{ + struct m32r_unwind_cache *info + = m32r_frame_unwind_cache (this_frame, this_prologue_cache); + return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); +} + +static const struct frame_unwind m32r_frame_unwind = { + NORMAL_FRAME, + m32r_frame_this_id, + m32r_frame_prev_register, + NULL, + default_frame_sniffer +}; + +static CORE_ADDR +m32r_frame_base_address (struct frame_info *this_frame, void **this_cache) +{ + struct m32r_unwind_cache *info + = m32r_frame_unwind_cache (this_frame, this_cache); + return info->base; +} + +static const struct frame_base m32r_frame_base = { + &m32r_frame_unwind, + m32r_frame_base_address, + m32r_frame_base_address, + m32r_frame_base_address +}; + +/* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy + frame. The frame ID's base needs to match the TOS value saved by + save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */ + +static struct frame_id +m32r_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) +{ + CORE_ADDR sp = get_frame_register_unsigned (this_frame, M32R_SP_REGNUM); + return frame_id_build (sp, get_frame_pc (this_frame)); +} + + +static gdbarch_init_ftype m32r_gdbarch_init; + +static struct gdbarch * +m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) +{ + struct gdbarch *gdbarch; + struct gdbarch_tdep *tdep; + + /* If there is already a candidate, use it. */ + arches = gdbarch_list_lookup_by_info (arches, &info); + if (arches != NULL) + return arches->gdbarch; + + /* Allocate space for the new architecture. */ + tdep = XMALLOC (struct gdbarch_tdep); + gdbarch = gdbarch_alloc (&info, tdep); + + set_gdbarch_read_pc (gdbarch, m32r_read_pc); + set_gdbarch_write_pc (gdbarch, m32r_write_pc); + set_gdbarch_unwind_sp (gdbarch, m32r_unwind_sp); + + set_gdbarch_num_regs (gdbarch, M32R_NUM_REGS); + set_gdbarch_sp_regnum (gdbarch, M32R_SP_REGNUM); + set_gdbarch_register_name (gdbarch, m32r_register_name); + set_gdbarch_register_type (gdbarch, m32r_register_type); + + set_gdbarch_push_dummy_call (gdbarch, m32r_push_dummy_call); + set_gdbarch_return_value (gdbarch, m32r_return_value); + + set_gdbarch_skip_prologue (gdbarch, m32r_skip_prologue); + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + set_gdbarch_breakpoint_from_pc (gdbarch, m32r_breakpoint_from_pc); + set_gdbarch_memory_insert_breakpoint (gdbarch, + m32r_memory_insert_breakpoint); + set_gdbarch_memory_remove_breakpoint (gdbarch, + m32r_memory_remove_breakpoint); + + set_gdbarch_frame_align (gdbarch, m32r_frame_align); + + frame_base_set_default (gdbarch, &m32r_frame_base); + + /* Methods for saving / extracting a dummy frame's ID. The ID's + stack address must match the SP value returned by + PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */ + set_gdbarch_dummy_id (gdbarch, m32r_dummy_id); + + /* Return the unwound PC value. */ + set_gdbarch_unwind_pc (gdbarch, m32r_unwind_pc); + + set_gdbarch_print_insn (gdbarch, print_insn_m32r); + + /* Hook in ABI-specific overrides, if they have been registered. */ + gdbarch_init_osabi (info, gdbarch); + + /* Hook in the default unwinders. */ + frame_unwind_append_unwinder (gdbarch, &m32r_frame_unwind); + + /* Support simple overlay manager. */ + set_gdbarch_overlay_update (gdbarch, simple_overlay_update); + + return gdbarch; } void -_initialize_m32r_tdep () +_initialize_m32r_tdep (void) { - tm_print_insn = print_insn_m32r; + register_gdbarch_init (bfd_arch_m32r, m32r_gdbarch_init); }