| /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
| Copyright 1996, 1997, 1998, 1999, 2000, 2001 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #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" |
| #include "regcache.h" |
| #include "arch-utils.h" |
| |
| extern void _initialize_mn10300_tdep (void); |
| static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi, |
| CORE_ADDR pc); |
| |
| /* 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 (struct frame_info *fi, int movm_args) |
| { |
| int offset = 0; |
| |
| if (fi == NULL || movm_args == 0) |
| return; |
| |
| 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; |
| } |
| } |
| } |
| |
| |
| /* 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 <size>,sp |
| |
| Without frame pointer: |
| movm [d2,d3,a2,a3],sp (if needed) |
| add <size>,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 <imm>,sp. This tells |
| frame chain to not bother trying to unwind past this frame. */ |
| |
| static CORE_ADDR |
| 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, 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->extra_info->status = NO_MORE_FRAMES; |
| return pc; |
| } |
| |
| /* At the start of a function our frame is in the stack pointer. */ |
| if (fi) |
| 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. */ |
| 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->extra_info->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->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, 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->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. */ |
| 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: 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. |
| |
| 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? */ |
| |
| static CORE_ADDR |
| mn10300_frame_chain (struct frame_info *fi) |
| { |
| struct frame_info *dummy; |
| /* Walk through the prologue to determine the stack size, |
| location of saved registers, end of the prologue, etc. */ |
| 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->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 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 = 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->saved_regs[A3_REGNUM]) |
| return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE)); |
| else |
| return read_register (A3_REGNUM); |
| } |
| else |
| { |
| 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 |
| + <his size>. */ |
| 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. */ |
| |
| 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); |
| } |
| |
| /* 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; |
| |
| write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); |
| |
| /* 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->saved_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. */ |
| } |
| |
| /* 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 (); |
| } |
| |
| /* Function: push_arguments |
| Setup arguments for a call to the target. Arguments go in |
| order on the stack. */ |
| |
| 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; |
| 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 */ |
| |
| static CORE_ADDR |
| mn10300_push_return_address (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. */ |
| |
| 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); |
| } |
| |
| /* 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. */ |
| |
| static CORE_ADDR |
| mn10300_frame_saved_pc (struct frame_info *fi) |
| { |
| int adjust = saved_regs_size (fi); |
| |
| return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); |
| } |
| |
| /* 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(). |
| |
| 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). */ |
| |
| static void |
| mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| { |
| if (fi->next) |
| fi->pc = FRAME_SAVED_PC (fi->next); |
| |
| 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 function's job is handled by init_extra_frame_info. */ |
| static void |
| mn10300_frame_init_saved_regs (struct frame_info *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. */ |
| |
| 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 |
| { |
| *reg = A3_REGNUM; |
| *offset = 0; |
| } |
| } |
| |
| 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) |
| { |
| 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"); |
| } |
| } |
| } |
| |
| /* 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 (void) |
| { |
| /* printf("_initialize_mn10300_tdep\n"); */ |
| |
| tm_print_insn = print_insn_mn10300; |
| |
| register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init); |
| } |