X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fmn10300-tdep.c;h=dd7674edc8d5faf7848056ebb214a4ca90e51ec2;hb=9ab433aae8243622dbc5756a7f7c82cf0fd5cb1c;hp=682671337d14708c317bf1f42cd55becfd60cac0;hpb=52e4073c5f4ac5d83f82bd36f49d5405b547e8fd;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c index 682671337d..dd7674edc8 100644 --- a/gdb/mn10300-tdep.c +++ b/gdb/mn10300-tdep.c @@ -1,21 +1,23 @@ /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. - Copyright 1996, 1997 Free Software Foundation, Inc. + Copyright 1996, 1997, 1998, 1999, 2000, 2001 + Free Software Foundation, Inc. -This file is part of GDB. + 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 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. + 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. */ + 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. */ #include "defs.h" #include "frame.h" @@ -27,38 +29,235 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "gdb_string.h" #include "gdbcore.h" #include "symfile.h" +#include "regcache.h" +#include "arch-utils.h" -char *mn10300_generic_register_names[] = REGISTER_NAMES; +extern void _initialize_mn10300_tdep (void); +static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, + CORE_ADDR pc); -/* start-sanitize-am33 */ -char *am33_register_names [] = -{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", - "sp", "pc", "mdr", "psw", "lir", "lar", "", - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""}; -/* end-sanitize-am33 */ +/* mn10300 private data */ +struct gdbarch_tdep +{ + int am33_mode; +#define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode) +}; + +/* Additional info used by the frame */ + +struct frame_extra_info + { + int status; + int stack_size; + }; + + +static char * +register_name (int reg, char **regs, long sizeof_regs) +{ + if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0])) + return NULL; + else + return regs[reg]; +} + +static char * +mn10300_generic_register_name (int reg) +{ + static char *regs[] = + { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", + "sp", "pc", "mdr", "psw", "lir", "lar", "", "", + "", "", "", "", "", "", "", "", + "", "", "", "", "", "", "", "fp" + }; + return register_name (reg, regs, sizeof regs); +} + + +static char * +am33_register_name (int reg) +{ + static char *regs[] = + { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", + "sp", "pc", "mdr", "psw", "lir", "lar", "", + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", + "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", "" + }; + return register_name (reg, regs, sizeof regs); +} + +static CORE_ADDR +mn10300_saved_pc_after_call (struct frame_info *fi) +{ + return read_memory_integer (read_register (SP_REGNUM), 4); +} + +static void +mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf) +{ + if (TYPE_CODE (type) == TYPE_CODE_PTR) + memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type)); + else + memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type)); +} + +static CORE_ADDR +mn10300_extract_struct_value_address (char *regbuf) +{ + return extract_address (regbuf + REGISTER_BYTE (4), + REGISTER_RAW_SIZE (4)); +} + +static void +mn10300_store_return_value (struct type *type, char *valbuf) +{ + if (TYPE_CODE (type) == TYPE_CODE_PTR) + write_register_bytes (REGISTER_BYTE (4), valbuf, TYPE_LENGTH (type)); + else + write_register_bytes (REGISTER_BYTE (0), valbuf, TYPE_LENGTH (type)); +} + +static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR); +static struct frame_info * +analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame) +{ + static struct frame_info *dummy = NULL; + if (dummy == NULL) + { + dummy = xmalloc (sizeof (struct frame_info)); + dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS); + dummy->extra_info = xmalloc (sizeof (struct frame_extra_info)); + } + dummy->next = NULL; + dummy->prev = NULL; + dummy->pc = pc; + dummy->frame = frame; + dummy->extra_info->status = 0; + dummy->extra_info->stack_size = 0; + memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS); + mn10300_analyze_prologue (dummy, 0); + return dummy; +} + +/* Values for frame_info.status */ + +#define MY_FRAME_IN_SP 0x1 +#define MY_FRAME_IN_FP 0x2 +#define NO_MORE_FRAMES 0x4 + + +/* Should call_function allocate stack space for a struct return? */ +static int +mn10300_use_struct_convention (int gcc_p, struct type *type) +{ + return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); +} + +/* The breakpoint instruction must be the same size as the smallest + instruction in the instruction set. + + The Matsushita mn10x00 processors have single byte instructions + so we need a single byte breakpoint. Matsushita hasn't defined + one, so we defined it ourselves. */ + +static unsigned char * +mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size) +{ + static char breakpoint[] = + {0xff}; + *bp_size = 1; + return breakpoint; +} + + +/* Fix fi->frame if it's bogus at this point. This is a helper + function for mn10300_analyze_prologue. */ + +static void +fix_frame_pointer (struct frame_info *fi, int stack_size) +{ + if (fi && fi->next == NULL) + { + if (fi->extra_info->status & MY_FRAME_IN_SP) + fi->frame = read_sp () - stack_size; + else if (fi->extra_info->status & MY_FRAME_IN_FP) + fi->frame = read_register (A3_REGNUM); + } +} /* Set offsets of registers saved by movm instruction. This is a helper function for mn10300_analyze_prologue. */ static void -set_movm_offsets (fi, found_movm) - struct frame_info *fi; - int found_movm; +set_movm_offsets (struct frame_info *fi, int movm_args) { - if (fi == NULL || found_movm == 0) + int offset = 0; + + if (fi == NULL || movm_args == 0) return; - fi->fsr.regs[7] = fi->frame; - fi->fsr.regs[6] = fi->frame + 4; - fi->fsr.regs[3] = fi->frame + 8; - fi->fsr.regs[2] = fi->frame + 12; - /* start-sanitize-am33 */ - fi->fsr.regs[E0_REGNUM+5] = fi->frame + 16; - fi->fsr.regs[E0_REGNUM+4] = fi->frame + 20; - fi->fsr.regs[E0_REGNUM+3] = fi->frame + 24; - fi->fsr.regs[E0_REGNUM+2] = fi->frame + 28; - /* end-sanitize-am33 */ + + if (movm_args & movm_other_bit) + { + /* The `other' bit leaves a blank area of four bytes at the + beginning of its block of saved registers, making it 32 bytes + long in total. */ + fi->saved_regs[LAR_REGNUM] = fi->frame + offset + 4; + fi->saved_regs[LIR_REGNUM] = fi->frame + offset + 8; + fi->saved_regs[MDR_REGNUM] = fi->frame + offset + 12; + fi->saved_regs[A0_REGNUM + 1] = fi->frame + offset + 16; + fi->saved_regs[A0_REGNUM] = fi->frame + offset + 20; + fi->saved_regs[D0_REGNUM + 1] = fi->frame + offset + 24; + fi->saved_regs[D0_REGNUM] = fi->frame + offset + 28; + offset += 32; + } + if (movm_args & movm_a3_bit) + { + fi->saved_regs[A3_REGNUM] = fi->frame + offset; + offset += 4; + } + if (movm_args & movm_a2_bit) + { + fi->saved_regs[A2_REGNUM] = fi->frame + offset; + offset += 4; + } + if (movm_args & movm_d3_bit) + { + fi->saved_regs[D3_REGNUM] = fi->frame + offset; + offset += 4; + } + if (movm_args & movm_d2_bit) + { + fi->saved_regs[D2_REGNUM] = fi->frame + offset; + offset += 4; + } + if (AM33_MODE) + { + if (movm_args & movm_exother_bit) + { + fi->saved_regs[MCVF_REGNUM] = fi->frame + offset; + fi->saved_regs[MCRL_REGNUM] = fi->frame + offset + 4; + fi->saved_regs[MCRH_REGNUM] = fi->frame + offset + 8; + fi->saved_regs[MDRQ_REGNUM] = fi->frame + offset + 12; + fi->saved_regs[E0_REGNUM + 1] = fi->frame + offset + 16; + fi->saved_regs[E0_REGNUM + 0] = fi->frame + offset + 20; + offset += 24; + } + if (movm_args & movm_exreg1_bit) + { + fi->saved_regs[E0_REGNUM + 7] = fi->frame + offset; + fi->saved_regs[E0_REGNUM + 6] = fi->frame + offset + 4; + fi->saved_regs[E0_REGNUM + 5] = fi->frame + offset + 8; + fi->saved_regs[E0_REGNUM + 4] = fi->frame + offset + 12; + offset += 16; + } + if (movm_args & movm_exreg0_bit) + { + fi->saved_regs[E0_REGNUM + 3] = fi->frame + offset; + fi->saved_regs[E0_REGNUM + 2] = fi->frame + offset + 4; + offset += 8; + } + } } @@ -67,63 +266,57 @@ set_movm_offsets (fi, found_movm) For reference here's how prologues look on the mn10300: - With frame pointer: - movm [d2,d3,a2,a3],sp - mov sp,a3 - add ,sp + With frame pointer: + movm [d2,d3,a2,a3],sp + mov sp,a3 + add ,sp - Without frame pointer: - movm [d2,d3,a2,a3],sp (if needed) - add ,sp + Without frame pointer: + movm [d2,d3,a2,a3],sp (if needed) + add ,sp One day we might keep the stack pointer constant, that won't change the code for prologues, but it will make the frame pointerless case much more common. */ - + /* Analyze the prologue to determine where registers are saved, the end of the prologue, etc etc. Return the end of the prologue scanned. We store into FI (if non-null) several tidbits of information: - * stack_size -- size of this stack frame. Note that if we stop in - certain parts of the prologue/epilogue we may claim the size of the - current frame is zero. This happens when the current frame has - not been allocated yet or has already been deallocated. + * stack_size -- size of this stack frame. Note that if we stop in + certain parts of the prologue/epilogue we may claim the size of the + current frame is zero. This happens when the current frame has + not been allocated yet or has already been deallocated. - * fsr -- Addresses of registers saved in the stack by this frame. + * fsr -- Addresses of registers saved in the stack by this frame. - * status -- A (relatively) generic status indicator. It's a bitmask - with the following bits: + * status -- A (relatively) generic status indicator. It's a bitmask + with the following bits: - MY_FRAME_IN_SP: The base of the current frame is actually in - the stack pointer. This can happen for frame pointerless - functions, or cases where we're stopped in the prologue/epilogue - itself. For these cases mn10300_analyze_prologue will need up - update fi->frame before returning or analyzing the register - save instructions. + MY_FRAME_IN_SP: The base of the current frame is actually in + the stack pointer. This can happen for frame pointerless + functions, or cases where we're stopped in the prologue/epilogue + itself. For these cases mn10300_analyze_prologue will need up + update fi->frame before returning or analyzing the register + save instructions. - MY_FRAME_IN_FP: The base of the current frame is in the - frame pointer register ($a2). + MY_FRAME_IN_FP: The base of the current frame is in the + frame pointer register ($a2). - NO_MORE_FRAMES: Set this if the current frame is "start" or - if the first instruction looks like mov ,sp. This tells - frame chain to not bother trying to unwind past this frame. */ + NO_MORE_FRAMES: Set this if the current frame is "start" or + if the first instruction looks like mov ,sp. This tells + frame chain to not bother trying to unwind past this frame. */ -#define MY_FRAME_IN_SP 0x1 -#define MY_FRAME_IN_FP 0x2 -#define NO_MORE_FRAMES 0x4 - static CORE_ADDR -mn10300_analyze_prologue (fi, pc) - struct frame_info *fi; - CORE_ADDR pc; +mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc) { CORE_ADDR func_addr, func_end, addr, stop; CORE_ADDR stack_size; int imm_size; unsigned char buf[4]; - int status, found_movm = 0; + int status, movm_args = 0; char *name; /* Use the PC in the frame if it's provided to look up the @@ -136,18 +329,21 @@ mn10300_analyze_prologue (fi, pc) /* Do nothing if we couldn't find the start of this function or if we're stopped at the first instruction in the prologue. */ if (status == 0) - return pc; + { + return pc; + } /* If we're in start, then give up. */ if (strcmp (name, "start") == 0) { - fi->status = NO_MORE_FRAMES; + if (fi != NULL) + fi->extra_info->status = NO_MORE_FRAMES; return pc; } /* At the start of a function our frame is in the stack pointer. */ if (fi) - fi->status = MY_FRAME_IN_SP; + fi->extra_info->status = MY_FRAME_IN_SP; /* Get the next two bytes into buf, we need two because rets is a two byte insn and the first isn't enough to uniquely identify it. */ @@ -189,8 +385,7 @@ mn10300_analyze_prologue (fi, pc) status = read_memory_nobpt (addr, buf, 2); if (status != 0) { - if (fi && fi->next == NULL && fi->status & MY_FRAME_IN_SP) - fi->frame = read_sp (); + fix_frame_pointer (fi, 0); return addr; } @@ -199,7 +394,7 @@ mn10300_analyze_prologue (fi, pc) if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) { if (fi) - fi->status = NO_MORE_FRAMES; + fi->extra_info->status = NO_MORE_FRAMES; return addr; } @@ -210,7 +405,10 @@ mn10300_analyze_prologue (fi, pc) in fsr.regs as needed. */ if (buf[0] == 0xcf) { - found_movm = 1; + /* Extract the register list for the movm instruction. */ + status = read_memory_nobpt (addr + 1, buf, 1); + movm_args = *buf; + addr += 2; /* Quit now if we're beyond the stop point. */ @@ -221,7 +419,7 @@ mn10300_analyze_prologue (fi, pc) fi->frame = read_sp (); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } @@ -234,7 +432,7 @@ mn10300_analyze_prologue (fi, pc) fi->frame = read_sp (); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } } @@ -247,15 +445,18 @@ mn10300_analyze_prologue (fi, pc) /* The frame pointer is now valid. */ if (fi) { - fi->status |= MY_FRAME_IN_FP; - fi->status &= ~MY_FRAME_IN_SP; + fi->extra_info->status |= MY_FRAME_IN_FP; + fi->extra_info->status &= ~MY_FRAME_IN_SP; } /* Quit now if we're beyond the stop point. */ if (addr >= stop) { + /* Fix fi->frame if it's bogus at this point. */ + fix_frame_pointer (fi, 0); + /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } @@ -263,19 +464,22 @@ mn10300_analyze_prologue (fi, pc) status = read_memory_nobpt (addr, buf, 2); if (status != 0) { + /* Fix fi->frame if it's bogus at this point. */ + fix_frame_pointer (fi, 0); + /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } } - + /* Next we should allocate the local frame. No more prologue insns are found after allocating the local frame. - + Search for add imm8,sp (0xf8feXX) - or add imm16,sp (0xfafeXXXX) - or add imm32,sp (0xfcfeXXXXXXXX). - + or add imm16,sp (0xfafeXXXX) + or add imm32,sp (0xfcfeXXXXXXXX). + If none of the above was found, then this prologue has no additional stack. */ @@ -283,11 +487,10 @@ mn10300_analyze_prologue (fi, pc) if (status != 0) { /* Fix fi->frame if it's bogus at this point. */ - if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP)) - fi->frame = read_sp (); + fix_frame_pointer (fi, 0); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } @@ -307,43 +510,66 @@ mn10300_analyze_prologue (fi, pc) if (status != 0) { /* Fix fi->frame if it's bogus at this point. */ - if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP)) - fi->frame = read_sp (); + fix_frame_pointer (fi, 0); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } /* Note the size of the stack in the frame info structure. */ stack_size = extract_signed_integer (buf, imm_size); if (fi) - fi->stack_size = stack_size; + fi->extra_info->stack_size = stack_size; /* We just consumed 2 + imm_size bytes. */ addr += 2 + imm_size; /* No more prologue insns follow, so begin preparation to return. */ /* Fix fi->frame if it's bogus at this point. */ - if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP)) - fi->frame = read_sp (); + fix_frame_pointer (fi, stack_size); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } /* We never found an insn which allocates local stack space, regardless this is the end of the prologue. */ /* Fix fi->frame if it's bogus at this point. */ - if (fi && fi->next == NULL && (fi->status & MY_FRAME_IN_SP)) - fi->frame = read_sp (); + fix_frame_pointer (fi, 0); /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, found_movm); + set_movm_offsets (fi, movm_args); return addr; } - + + +/* Function: saved_regs_size + Return the size in bytes of the register save area, based on the + saved_regs array in FI. */ +static int +saved_regs_size (struct frame_info *fi) +{ + int adjust = 0; + int i; + + /* Reserve four bytes for every register saved. */ + for (i = 0; i < NUM_REGS; i++) + if (fi->saved_regs[i]) + adjust += 4; + + /* If we saved LIR, then it's most likely we used a `movm' + instruction with the `other' bit set, in which case the SP is + decremented by an extra four bytes, "to simplify calculation + of the transfer area", according to the processor manual. */ + if (fi->saved_regs[LIR_REGNUM]) + adjust += 4; + + return adjust; +} + + /* Function: frame_chain Figure out and return the caller's frame pointer given current frame_info struct. @@ -351,115 +577,104 @@ mn10300_analyze_prologue (fi, pc) We don't handle dummy frames yet but we would probably just return the stack pointer that was in use at the time the function call was made? */ -CORE_ADDR -mn10300_frame_chain (fi) - struct frame_info *fi; +static CORE_ADDR +mn10300_frame_chain (struct frame_info *fi) { - struct frame_info dummy_frame; - + struct frame_info *dummy; /* Walk through the prologue to determine the stack size, location of saved registers, end of the prologue, etc. */ - if (fi->status == 0) - mn10300_analyze_prologue (fi, (CORE_ADDR)0); + if (fi->extra_info->status == 0) + mn10300_analyze_prologue (fi, (CORE_ADDR) 0); /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ - if (fi->status & NO_MORE_FRAMES) + if (fi->extra_info->status & NO_MORE_FRAMES) return 0; /* Now that we've analyzed our prologue, determine the frame pointer for our caller. - If our caller has a frame pointer, then we need to - find the entry value of $a3 to our function. + If our caller has a frame pointer, then we need to + find the entry value of $a3 to our function. - If fsr.regs[7] is nonzero, then it's at the memory - location pointed to by fsr.regs[7]. + If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory + location pointed to by fsr.regs[A3_REGNUM]. - Else it's still in $a3. + Else it's still in $a3. - If our caller does not have a frame pointer, then his - frame base is fi->frame + -caller's stack size. */ - - /* The easiest way to get that info is to analyze our caller's frame. + If our caller does not have a frame pointer, then his + frame base is fi->frame + -caller's stack size. */ + /* The easiest way to get that info is to analyze our caller's frame. So we set up a dummy frame and call mn10300_analyze_prologue to find stuff for us. */ - dummy_frame.pc = FRAME_SAVED_PC (fi); - dummy_frame.frame = fi->frame; - memset (dummy_frame.fsr.regs, '\000', sizeof dummy_frame.fsr.regs); - dummy_frame.status = 0; - dummy_frame.stack_size = 0; - mn10300_analyze_prologue (&dummy_frame); - - if (dummy_frame.status & MY_FRAME_IN_FP) + dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame); + + if (dummy->extra_info->status & MY_FRAME_IN_FP) { /* Our caller has a frame pointer. So find the frame in $a3 or in the stack. */ - if (fi->fsr.regs[7]) - return (read_memory_integer (fi->fsr.regs[FP_REGNUM], REGISTER_SIZE)); + if (fi->saved_regs[A3_REGNUM]) + return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE)); else - return read_register (FP_REGNUM); + return read_register (A3_REGNUM); } else { - int adjust = 0; - - adjust += (fi->fsr.regs[2] ? 4 : 0); - adjust += (fi->fsr.regs[3] ? 4 : 0); - adjust += (fi->fsr.regs[6] ? 4 : 0); - adjust += (fi->fsr.regs[7] ? 4 : 0); + int adjust = saved_regs_size (fi); /* Our caller does not have a frame pointer. So his frame starts - at the base of our frame (fi->frame) + register save space. */ - return fi->frame + adjust; + at the base of our frame (fi->frame) + register save space + + . */ + return fi->frame + adjust + -dummy->extra_info->stack_size; } } /* Function: skip_prologue Return the address of the first inst past the prologue of the function. */ -CORE_ADDR -mn10300_skip_prologue (pc) - CORE_ADDR pc; +static CORE_ADDR +mn10300_skip_prologue (CORE_ADDR pc) { /* We used to check the debug symbols, but that can lose if we have a null prologue. */ return mn10300_analyze_prologue (NULL, pc); } - -/* Function: pop_frame - This routine gets called when either the user uses the `return' - command, or the call dummy breakpoint gets hit. */ - -void -mn10300_pop_frame (frame) - struct frame_info *frame; +/* generic_pop_current_frame calls this function if the current + frame isn't a dummy frame. */ +static void +mn10300_pop_frame_regular (struct frame_info *frame) { int regnum; - if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame)) - generic_pop_dummy_frame (); - else - { - write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); + write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); - /* Restore any saved registers. */ - for (regnum = 0; regnum < NUM_REGS; regnum++) - if (frame->fsr.regs[regnum] != 0) - { - ULONGEST value; + /* Restore any saved registers. */ + for (regnum = 0; regnum < NUM_REGS; regnum++) + if (frame->saved_regs[regnum] != 0) + { + ULONGEST value; - value = read_memory_unsigned_integer (frame->fsr.regs[regnum], - REGISTER_RAW_SIZE (regnum)); - write_register (regnum, value); - } + value = read_memory_unsigned_integer (frame->saved_regs[regnum], + REGISTER_RAW_SIZE (regnum)); + write_register (regnum, value); + } - /* Actually cut back the stack. */ - write_register (SP_REGNUM, FRAME_FP (frame)); + /* Actually cut back the stack. */ + write_register (SP_REGNUM, FRAME_FP (frame)); - /* Don't we need to set the PC?!? XXX FIXME. */ - } + /* Don't we need to set the PC?!? XXX FIXME. */ +} + +/* Function: pop_frame + This routine gets called when either the user uses the `return' + command, or the call dummy breakpoint gets hit. */ +static void +mn10300_pop_frame (void) +{ + /* This function checks for and handles generic dummy frames, and + calls back to our function for ordinary frames. */ + generic_pop_current_frame (mn10300_pop_frame_regular); /* Throw away any cached frame information. */ flush_cached_frames (); @@ -469,13 +684,9 @@ mn10300_pop_frame (frame) Setup arguments for a call to the target. Arguments go in order on the stack. */ -CORE_ADDR -mn10300_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 +mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp, + int struct_return, CORE_ADDR struct_addr) { int argnum = 0; int len = 0; @@ -517,13 +728,13 @@ mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr) && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) { /* XXX Wrong, we want a pointer to this argument. */ - len = TYPE_LENGTH (VALUE_TYPE (*args)); - val = (char *)VALUE_CONTENTS (*args); + len = TYPE_LENGTH (VALUE_TYPE (*args)); + val = (char *) VALUE_CONTENTS (*args); } else { len = TYPE_LENGTH (VALUE_TYPE (*args)); - val = (char *)VALUE_CONTENTS (*args); + val = (char *) VALUE_CONTENTS (*args); } while (regsused < 2 && len > 0) @@ -553,11 +764,9 @@ mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr) /* Function: push_return_address (pc) Set up the return address for the inferior function call. Needed for targets where we don't actually execute a JSR/BSR instruction */ - -CORE_ADDR -mn10300_push_return_address (pc, sp) - CORE_ADDR pc; - CORE_ADDR sp; + +static CORE_ADDR +mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp) { unsigned char buf[4]; @@ -569,17 +778,14 @@ mn10300_push_return_address (pc, sp) /* Function: store_struct_return (addr,sp) Store the structure value return address for an inferior function call. */ - -CORE_ADDR -mn10300_store_struct_return (addr, sp) - CORE_ADDR addr; - CORE_ADDR sp; + +static void +mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) { /* The structure return address is passed as the first argument. */ write_register (0, addr); - return sp; } - + /* 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 @@ -587,34 +793,15 @@ mn10300_store_struct_return (addr, sp) instead of RP, because that's where "caller" of the dummy-frame will be found. */ -CORE_ADDR -mn10300_frame_saved_pc (fi) - struct frame_info *fi; +static CORE_ADDR +mn10300_frame_saved_pc (struct frame_info *fi) { - int adjust = 0; - - adjust += (fi->fsr.regs[2] ? 4 : 0); - adjust += (fi->fsr.regs[3] ? 4 : 0); - adjust += (fi->fsr.regs[6] ? 4 : 0); - adjust += (fi->fsr.regs[7] ? 4 : 0); + int adjust = saved_regs_size (fi); return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); } -void -get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) - char *raw_buffer; - int *optimized; - CORE_ADDR *addrp; - struct frame_info *frame; - int regnum; - enum lval_type *lval; -{ - generic_get_saved_register (raw_buffer, optimized, addrp, - frame, regnum, lval); -} - -/* Function: init_extra_frame_info +/* Function: mn10300_init_extra_frame_info Setup the frame's frame pointer, pc, and frame addresses for saved registers. Most of the work is done in mn10300_analyze_prologue(). @@ -628,50 +815,327 @@ get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) First, during normal backtracing, second, while figuring out the frame pointer just prior to calling the target function (see run_stack_dummy). */ -void -mn10300_init_extra_frame_info (fi) - struct frame_info *fi; +static void +mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi) { if (fi->next) fi->pc = FRAME_SAVED_PC (fi->next); - memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); - fi->status = 0; - fi->stack_size = 0; + frame_saved_regs_zalloc (fi); + fi->extra_info = (struct frame_extra_info *) + frame_obstack_alloc (sizeof (struct frame_extra_info)); + + fi->extra_info->status = 0; + fi->extra_info->stack_size = 0; mn10300_analyze_prologue (fi, 0); } -/* This can be made more generic later. */ + +/* This function's job is handled by init_extra_frame_info. */ static void -set_machine_hook (filename) - char *filename; +mn10300_frame_init_saved_regs (struct frame_info *frame) { - int i; +} - if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300 - || bfd_get_mach (exec_bfd) == 0) + +/* 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. */ + +void +mn10300_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset) +{ + struct frame_info *dummy = analyze_dummy_frame (pc, 0); + /* Set up a dummy frame_info, Analyze the prolog and fill in the + extra info. */ + /* Results will tell us which type of frame it uses. */ + if (dummy->extra_info->status & MY_FRAME_IN_SP) + { + *reg = SP_REGNUM; + *offset = -(dummy->extra_info->stack_size); + } + else { - for (i = 0; i < NUM_REGS; i++) - reg_names[i] = mn10300_generic_register_names[i]; + *reg = A3_REGNUM; + *offset = 0; } +} - /* start-sanitize-am33 */ - if (bfd_get_mach (exec_bfd) == bfd_mach_am33) +static int +mn10300_reg_struct_has_addr (int gcc_p, struct type *type) +{ + return (TYPE_LENGTH (type) > 8); +} + +static struct type * +mn10300_register_virtual_type (int reg) +{ + return builtin_type_int; +} + +static int +mn10300_register_byte (int reg) +{ + return (reg * 4); +} + +static int +mn10300_register_virtual_size (int reg) +{ + return 4; +} + +static int +mn10300_register_raw_size (int reg) +{ + return 4; +} + +/* If DWARF2 is a register number appearing in Dwarf2 debug info, then + mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB + register number. Why don't Dwarf2 and GDB use the same numbering? + Who knows? But since people have object files lying around with + the existing Dwarf2 numbering, and other people have written stubs + to work with the existing GDB, neither of them can change. So we + just have to cope. */ +static int +mn10300_dwarf2_reg_to_regnum (int dwarf2) +{ + /* This table is supposed to be shaped like the REGISTER_NAMES + initializer in gcc/config/mn10300/mn10300.h. Registers which + appear in GCC's numbering, but have no counterpart in GDB's + world, are marked with a -1. */ + static int dwarf2_to_gdb[] = { + 0, 1, 2, 3, 4, 5, 6, 7, -1, 8, + 15, 16, 17, 18, 19, 20, 21, 22 + }; + int gdb; + + if (dwarf2 < 0 + || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0])) + || dwarf2_to_gdb[dwarf2] == -1) + internal_error (__FILE__, __LINE__, + "bogus register number in debug info: %d", dwarf2); + + return dwarf2_to_gdb[dwarf2]; +} + +static void +mn10300_print_register (const char *name, int regnum, int reg_width) +{ + char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE); + + if (reg_width) + printf_filtered ("%*s: ", reg_width, name); + else + printf_filtered ("%s: ", name); + + /* Get the data */ + if (read_relative_register_raw_bytes (regnum, raw_buffer)) + { + printf_filtered ("[invalid]"); + return; + } + else + { + int byte; + if (TARGET_BYTE_ORDER == BIG_ENDIAN) + { + for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum); + byte < REGISTER_RAW_SIZE (regnum); + byte++) + printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); + } + else + { + for (byte = REGISTER_VIRTUAL_SIZE (regnum) - 1; + byte >= 0; + byte--) + printf_filtered ("%02x", (unsigned char) raw_buffer[byte]); + } + } +} + +static void +mn10300_do_registers_info (int regnum, int fpregs) +{ + if (regnum >= 0) { - for (i = 0; i < NUM_REGS; i++) - reg_names[i] = am33_register_names[i]; + const char *name = REGISTER_NAME (regnum); + if (name == NULL || name[0] == '\0') + error ("Not a valid register for the current processor type"); + mn10300_print_register (name, regnum, 0); + printf_filtered ("\n"); + } + else + { + /* print registers in an array 4x8 */ + int r; + int reg; + const int nr_in_row = 4; + const int reg_width = 4; + for (r = 0; r < NUM_REGS; r += nr_in_row) + { + int c; + int printing = 0; + int padding = 0; + for (c = r; c < r + nr_in_row; c++) + { + const char *name = REGISTER_NAME (c); + if (name != NULL && *name != '\0') + { + printing = 1; + while (padding > 0) + { + printf_filtered (" "); + padding--; + } + mn10300_print_register (name, c, reg_width); + printf_filtered (" "); + } + else + { + padding += (reg_width + 2 + 8 + 1); + } + } + if (printing) + printf_filtered ("\n"); + } } - /* end-sanitize-am33 */ } +/* Dump out the mn10300 speciic architecture information. */ + +static void +mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n", + tdep->am33_mode); +} + +static struct gdbarch * +mn10300_gdbarch_init (struct gdbarch_info info, + struct gdbarch_list *arches) +{ + static LONGEST mn10300_call_dummy_words[] = { 0 }; + struct gdbarch *gdbarch; + struct gdbarch_tdep *tdep = NULL; + int am33_mode; + gdbarch_register_name_ftype *register_name; + int mach; + int num_regs; + + arches = gdbarch_list_lookup_by_info (arches, &info); + if (arches != NULL) + return arches->gdbarch; + tdep = xmalloc (sizeof (struct gdbarch_tdep)); + gdbarch = gdbarch_alloc (&info, tdep); + + if (info.bfd_arch_info != NULL + && info.bfd_arch_info->arch == bfd_arch_mn10300) + mach = info.bfd_arch_info->mach; + else + mach = 0; + switch (mach) + { + case 0: + case bfd_mach_mn10300: + am33_mode = 0; + register_name = mn10300_generic_register_name; + num_regs = 32; + break; + case bfd_mach_am33: + am33_mode = 1; + register_name = am33_register_name; + num_regs = 32; + break; + default: + internal_error (__FILE__, __LINE__, + "mn10300_gdbarch_init: Unknown mn10300 variant"); + return NULL; /* keep GCC happy. */ + } + + /* Registers. */ + set_gdbarch_num_regs (gdbarch, num_regs); + set_gdbarch_register_name (gdbarch, register_name); + set_gdbarch_register_size (gdbarch, 4); + set_gdbarch_register_bytes (gdbarch, + num_regs * gdbarch_register_size (gdbarch)); + set_gdbarch_max_register_raw_size (gdbarch, 4); + set_gdbarch_register_raw_size (gdbarch, mn10300_register_raw_size); + set_gdbarch_register_byte (gdbarch, mn10300_register_byte); + set_gdbarch_max_register_virtual_size (gdbarch, 4); + set_gdbarch_register_virtual_size (gdbarch, mn10300_register_virtual_size); + set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type); + set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum); + set_gdbarch_do_registers_info (gdbarch, mn10300_do_registers_info); + set_gdbarch_fp_regnum (gdbarch, 31); + + /* Breakpoints. */ + set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc); + set_gdbarch_function_start_offset (gdbarch, 0); + set_gdbarch_decr_pc_after_break (gdbarch, 0); + + /* Stack unwinding. */ + set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); + set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); + set_gdbarch_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call); + set_gdbarch_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info); + set_gdbarch_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs); + set_gdbarch_frame_chain (gdbarch, mn10300_frame_chain); + set_gdbarch_frame_saved_pc (gdbarch, mn10300_frame_saved_pc); + set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value); + set_gdbarch_extract_struct_value_address + (gdbarch, mn10300_extract_struct_value_address); + set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value); + set_gdbarch_store_struct_return (gdbarch, mn10300_store_struct_return); + set_gdbarch_pop_frame (gdbarch, mn10300_pop_frame); + set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue); + set_gdbarch_frame_args_skip (gdbarch, 0); + set_gdbarch_frame_args_address (gdbarch, default_frame_address); + set_gdbarch_frame_locals_address (gdbarch, default_frame_address); + set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); + /* That's right, we're using the stack pointer as our frame pointer. */ + set_gdbarch_read_fp (gdbarch, generic_target_read_sp); + + /* Calling functions in the inferior from GDB. */ + set_gdbarch_call_dummy_p (gdbarch, 1); + set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); + set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); + set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); + set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); + set_gdbarch_call_dummy_address (gdbarch, entry_point_address); + set_gdbarch_call_dummy_words (gdbarch, mn10300_call_dummy_words); + set_gdbarch_sizeof_call_dummy_words (gdbarch, + sizeof (mn10300_call_dummy_words)); + set_gdbarch_call_dummy_length (gdbarch, 0); + set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); + set_gdbarch_call_dummy_start_offset (gdbarch, 0); + set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point); + set_gdbarch_use_generic_dummy_frames (gdbarch, 1); + set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); + set_gdbarch_push_arguments (gdbarch, mn10300_push_arguments); + set_gdbarch_reg_struct_has_addr (gdbarch, mn10300_reg_struct_has_addr); + set_gdbarch_push_return_address (gdbarch, mn10300_push_return_address); + set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos); + set_gdbarch_use_struct_convention (gdbarch, mn10300_use_struct_convention); + + tdep->am33_mode = am33_mode; + + return gdbarch; +} + void -_initialize_mn10300_tdep () +_initialize_mn10300_tdep (void) { /* printf("_initialize_mn10300_tdep\n"); */ tm_print_insn = print_insn_mn10300; - specify_exec_file_hook (set_machine_hook); + register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init); } -