From 071ea11e85eb9d529cc5eb3d35f6247466a21b99 Mon Sep 17 00:00:00 2001 From: Stan Shebs Date: Fri, 16 Apr 1999 01:34:07 +0000 Subject: Initial creation of sourceware repository --- gdb/mn10300-tdep.c | 815 ----------------------------------------------------- 1 file changed, 815 deletions(-) delete mode 100644 gdb/mn10300-tdep.c (limited to 'gdb/mn10300-tdep.c') diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c deleted file mode 100644 index eb2426f..0000000 --- a/gdb/mn10300-tdep.c +++ /dev/null @@ -1,815 +0,0 @@ -/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. - Copyright 1996, 1997, 1998 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. */ - -#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 "gdbcore.h" -#include "symfile.h" - -static char *mn10300_generic_register_names[] = -{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", - "sp", "pc", "mdr", "psw", "lir", "lar", "", "", - "", "", "", "", "", "", "", "", - "", "", "", "", "", "", "", "fp" }; - -char **mn10300_register_names = mn10300_generic_register_names; -/* start-sanitize-am33 */ -static 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", "", "", ""}; -static int am33_mode; -/* end-sanitize-am33 */ - -static CORE_ADDR mn10300_analyze_prologue PARAMS ((struct frame_info *fi, - CORE_ADDR pc)); - -/* 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? */ -int -mn10300_use_struct_convention (gcc_p, type) - 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. */ - -unsigned char * -mn10300_breakpoint_from_pc (bp_addr, bp_size) - 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 (fi, stack_size) - struct frame_info *fi; - int stack_size; -{ - if (fi && fi->next == NULL) - { - if (fi->status & MY_FRAME_IN_SP) - fi->frame = read_sp () - stack_size; - else if (fi->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, movm_args) - struct frame_info *fi; - int movm_args; -{ - int offset = 0; - - if (fi == NULL || movm_args == 0) - return; - - if (movm_args & 0x10) - { - fi->fsr.regs[A3_REGNUM] = fi->frame + offset; - offset += 4; - } - if (movm_args & 0x20) - { - fi->fsr.regs[A2_REGNUM] = fi->frame + offset; - offset += 4; - } - if (movm_args & 0x40) - { - fi->fsr.regs[D3_REGNUM] = fi->frame + offset; - offset += 4; - } - if (movm_args & 0x80) - { - fi->fsr.regs[D2_REGNUM] = fi->frame + offset; - offset += 4; - } - /* start-sanitize-am33 */ - if (am33_mode && movm_args & 0x02) - { - fi->fsr.regs[E0_REGNUM+5] = fi->frame + offset; - fi->fsr.regs[E0_REGNUM+4] = fi->frame + offset + 4; - fi->fsr.regs[E0_REGNUM+3] = fi->frame + offset + 8; - fi->fsr.regs[E0_REGNUM+2] = fi->frame + offset + 12; - } - /* end-sanitize-am33 */ -} - - -/* The main purpose of this file is dealing with prologues to extract - information about stack frames and saved registers. - - For reference here's how prologues look on the mn10300: - - 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 - - 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. - - * 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: - - 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). - - 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. */ - -static CORE_ADDR -mn10300_analyze_prologue (fi, pc) - 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, movm_args = 0; - char *name; - - /* Use the PC in the frame if it's provided to look up the - start of this function. */ - pc = (fi ? fi->pc : pc); - - /* Find the start of this function. */ - status = find_pc_partial_function (pc, &name, &func_addr, &func_end); - - /* 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; - - /* If we're in start, then give up. */ - if (strcmp (name, "start") == 0) - { - if (fi != NULL) - fi->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; - - /* 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. */ - status = read_memory_nobpt (pc, buf, 2); - if (status != 0) - return pc; - - /* If we're physically on an "rets" instruction, then our frame has - already been deallocated. Note this can also be true for retf - and ret if they specify a size of zero. - - In this case fi->frame is bogus, we need to fix it. */ - if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) - { - if (fi->next == NULL) - fi->frame = read_sp (); - return fi->pc; - } - - /* Similarly if we're stopped on the first insn of a prologue as our - frame hasn't been allocated yet. */ - if (fi && fi->pc == func_addr) - { - if (fi->next == NULL) - fi->frame = read_sp (); - return fi->pc; - } - - /* Figure out where to stop scanning. */ - stop = fi ? fi->pc : func_end; - - /* Don't walk off the end of the function. */ - stop = stop > func_end ? func_end : stop; - - /* Start scanning on the first instruction of this function. */ - addr = func_addr; - - /* Suck in two bytes. */ - status = read_memory_nobpt (addr, buf, 2); - if (status != 0) - { - fix_frame_pointer (fi, 0); - return addr; - } - - /* First see if this insn sets the stack pointer; if so, it's something - we won't understand, so quit now. */ - if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) - { - if (fi) - fi->status = NO_MORE_FRAMES; - return addr; - } - - /* Now look for movm [regs],sp, which saves the callee saved registers. - - At this time we don't know if fi->frame is valid, so we only note - that we encountered a movm instruction. Later, we'll set the entries - in fsr.regs as needed. */ - if (buf[0] == 0xcf) - { - /* 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. */ - if (addr >= stop) - { - /* Fix fi->frame since it's bogus at this point. */ - if (fi && fi->next == NULL) - fi->frame = read_sp (); - - /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, movm_args); - return addr; - } - - /* Get the next two bytes so the prologue scan can continue. */ - status = read_memory_nobpt (addr, buf, 2); - if (status != 0) - { - /* Fix fi->frame since it's bogus at this point. */ - if (fi && fi->next == NULL) - fi->frame = read_sp (); - - /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, movm_args); - return addr; - } - } - - /* Now see if we set up a frame pointer via "mov sp,a3" */ - if (buf[0] == 0x3f) - { - addr += 1; - - /* The frame pointer is now valid. */ - if (fi) - { - fi->status |= MY_FRAME_IN_FP; - fi->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, movm_args); - return addr; - } - - /* Get two more bytes so scanning can continue. */ - 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, 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). - - If none of the above was found, then this prologue has no - additional stack. */ - - 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, movm_args); - return addr; - } - - imm_size = 0; - if (buf[0] == 0xf8 && buf[1] == 0xfe) - imm_size = 1; - else if (buf[0] == 0xfa && buf[1] == 0xfe) - imm_size = 2; - else if (buf[0] == 0xfc && buf[1] == 0xfe) - imm_size = 4; - - if (imm_size != 0) - { - /* Suck in imm_size more bytes, they'll hold the size of the - current frame. */ - status = read_memory_nobpt (addr + 2, buf, imm_size); - 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, 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; - - /* 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. */ - fix_frame_pointer (fi, stack_size); - - /* Note if/where callee saved registers were saved. */ - 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. */ - fix_frame_pointer (fi, 0); - - /* Note if/where callee saved registers were saved. */ - set_movm_offsets (fi, movm_args); - return addr; -} - -/* Function: frame_chain - Figure out and return the caller's frame pointer given current - frame_info struct. - - 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; -{ - struct frame_info dummy_frame; - - /* 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); - - /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ - if (fi->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 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. - - 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, 0); - - if (dummy_frame.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[A3_REGNUM]) - return (read_memory_integer (fi->fsr.regs[A3_REGNUM], REGISTER_SIZE)); - else - return read_register (A3_REGNUM); - } - else - { - int adjust = 0; - - adjust += (fi->fsr.regs[D2_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[D3_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[A2_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[A3_REGNUM] ? 4 : 0); - /* start-sanitize-am33 */ - if (am33_mode) - { - adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0); - } - /* end-sanitize-am33 */ - - /* 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 + -dummy_frame.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; -{ - /* 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; -{ - 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)); - - /* Restore any saved registers. */ - for (regnum = 0; regnum < NUM_REGS; regnum++) - if (frame->fsr.regs[regnum] != 0) - { - ULONGEST value; - - value = read_memory_unsigned_integer (frame->fsr.regs[regnum], - REGISTER_RAW_SIZE (regnum)); - write_register (regnum, value); - } - - /* Actually cut back the stack. */ - write_register (SP_REGNUM, FRAME_FP (frame)); - - /* Don't we need to set the PC?!? XXX FIXME. */ - } - - /* Throw away any cached frame information. */ - flush_cached_frames (); -} - -/* Function: push_arguments - 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; -{ - int argnum = 0; - int len = 0; - int stack_offset = 0; - int regsused = struct_return ? 1 : 0; - - /* This should be a nop, but align the stack just in case something - went wrong. Stacks are four byte aligned on the mn10300. */ - sp &= ~3; - - /* Now make space on the stack for the args. - - XXX This doesn't appear to handle pass-by-invisible reference - arguments. */ - for (argnum = 0; argnum < nargs; argnum++) - { - int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; - - while (regsused < 2 && arg_length > 0) - { - regsused++; - arg_length -= 4; - } - len += arg_length; - } - - /* Allocate stack space. */ - sp -= len; - - regsused = struct_return ? 1 : 0; - /* Push all arguments onto the stack. */ - for (argnum = 0; argnum < nargs; argnum++) - { - int len; - char *val; - - /* XXX Check this. What about UNIONS? */ - if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT - && 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); - } - else - { - len = TYPE_LENGTH (VALUE_TYPE (*args)); - val = (char *)VALUE_CONTENTS (*args); - } - - while (regsused < 2 && len > 0) - { - write_register (regsused, extract_unsigned_integer (val, 4)); - val += 4; - len -= 4; - regsused++; - } - - while (len > 0) - { - write_memory (sp + stack_offset, val, 4); - len -= 4; - val += 4; - stack_offset += 4; - } - - args++; - } - - /* Make space for the flushback area. */ - sp -= 8; - return sp; -} - -/* 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; -{ - unsigned char buf[4]; - - store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); - write_memory (sp - 4, buf, 4); - return sp - 4; -} - -/* 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; -{ - /* 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 - registers. If the inner frame is a dummy frame, return its PC - 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; -{ - int adjust = 0; - - adjust += (fi->fsr.regs[D2_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[D3_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[A2_REGNUM] ? 4 : 0); - adjust += (fi->fsr.regs[A3_REGNUM] ? 4 : 0); - /* start-sanitize-am33 */ - if (am33_mode) - { - adjust += (fi->fsr.regs[E0_REGNUM+5] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+4] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+3] ? 4 : 0); - adjust += (fi->fsr.regs[E0_REGNUM+2] ? 4 : 0); - } - /* end-sanitize-am33 */ - - 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 - Setup the frame's frame pointer, pc, and frame addresses for saved - registers. Most of the work is done in mn10300_analyze_prologue(). - - Note that when we are called for the last frame (currently active frame), - that fi->pc and fi->frame will already be setup. However, fi->frame will - be valid only if this routine uses FP. For previous frames, fi-frame will - always be correct. mn10300_analyze_prologue will fix fi->frame if - it's not valid. - - We can be called with the PC in the call dummy under two circumstances. - 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; -{ - 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; - - mn10300_analyze_prologue (fi, 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 (pc, reg, offset) - CORE_ADDR pc; - long *reg; - long *offset; -{ - struct frame_info fi; - - /* Set up a dummy frame_info. */ - fi.next = NULL; - fi.prev = NULL; - fi.frame = 0; - fi.pc = pc; - - /* Analyze the prolog and fill in the extra info. */ - mn10300_init_extra_frame_info (&fi); - - /* Results will tell us which type of frame it uses. */ - if (fi.status & MY_FRAME_IN_SP) - { - *reg = SP_REGNUM; - *offset = -(fi.stack_size); - } - else - { - *reg = A3_REGNUM; - *offset = 0; - } -} - -/* This can be made more generic later. */ -static void -set_machine_hook (filename) - char *filename; -{ - int i; - - if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300 - || bfd_get_mach (exec_bfd) == 0) - { - mn10300_register_names = mn10300_generic_register_names; - } - - /* start-sanitize-am33 */ - am33_mode = 0; - if (bfd_get_mach (exec_bfd) == bfd_mach_am33) - { - - mn10300_register_names = am33_register_names; - am33_mode = 1; - } - /* end-sanitize-am33 */ -} - -void -_initialize_mn10300_tdep () -{ -/* printf("_initialize_mn10300_tdep\n"); */ - - tm_print_insn = print_insn_mn10300; - - specify_exec_file_hook (set_machine_hook); -} - -- cgit v1.1