| /* Parameters for target machine AMD 29000, for GDB, the GNU debugger. |
| Copyright 1990, 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000 |
| Free Software Foundation, Inc. |
| Contributed by Cygnus Support. Written by Jim Kingdon. |
| |
| 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. */ |
| |
| /* Parameters for an EB29K (a board which plugs into a PC and is |
| accessed through EBMON software running on the PC, which we |
| use as we'd use a remote stub (see remote-eb.c). |
| |
| If gdb is ported to other a29k machines/systems, the |
| machine/system-specific parts should be removed from this file (a |
| la tm-m68k.h). */ |
| |
| /* Byte order is configurable, but this machine runs big-endian. */ |
| #define TARGET_BYTE_ORDER BIG_ENDIAN |
| |
| /* Floating point uses IEEE representations. */ |
| #define IEEE_FLOAT (1) |
| |
| /* Recognize our magic number. */ |
| #define BADMAG(x) ((x).f_magic != 0572) |
| |
| /* Offset from address of function to start of its code. |
| Zero on most machines. */ |
| |
| #define FUNCTION_START_OFFSET 0 |
| |
| /* Advance PC across any function entry prologue instructions |
| to reach some "real" code. */ |
| |
| #define SKIP_PROLOGUE(pc) (a29k_skip_prologue (pc)) |
| CORE_ADDR a29k_skip_prologue (); |
| |
| /* Immediately after a function call, return the saved pc. |
| Can't go through the frames for this because on some machines |
| the new frame is not set up until the new function executes |
| some instructions. */ |
| |
| #define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT_FRAME) \ |
| ? read_register (TPC_REGNUM) \ |
| : read_register (LR0_REGNUM)) |
| |
| /* Stack grows downward. */ |
| |
| #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) |
| |
| /* Stack must be aligned on 32-bit boundaries when synthesizing |
| function calls. */ |
| |
| #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3) |
| |
| /* Sequence of bytes for breakpoint instruction. */ |
| /* ASNEQ 0x50, gr1, gr1 |
| The trap number 0x50 is chosen arbitrarily. |
| We let the command line (or previously included files) override this |
| setting. */ |
| #ifndef BREAKPOINT |
| #if TARGET_BYTE_ORDER == BIG_ENDIAN |
| #define BREAKPOINT {0x72, 0x50, 0x01, 0x01} |
| #else /* Target is little-endian. */ |
| #define BREAKPOINT {0x01, 0x01, 0x50, 0x72} |
| #endif /* Target is little-endian. */ |
| #endif /* BREAKPOINT */ |
| |
| /* Amount PC must be decremented by after a breakpoint. |
| This is often the number of bytes in BREAKPOINT |
| but not always. */ |
| |
| #define DECR_PC_AFTER_BREAK 0 |
| |
| /* Say how long (ordinary) registers are. This is a piece of bogosity |
| used in push_word and a few other places; REGISTER_RAW_SIZE is the |
| real way to know how big a register is. */ |
| |
| #define REGISTER_SIZE 4 |
| |
| /* Allow the register declarations here to be overridden for remote |
| kernel debugging. */ |
| #if !defined (REGISTER_NAMES) |
| |
| /* Number of machine registers */ |
| |
| #define NUM_REGS 205 |
| |
| /* Initializer for an array of names of registers. |
| There should be NUM_REGS strings in this initializer. |
| |
| FIXME, add floating point registers and support here. |
| |
| Also note that this list does not attempt to deal with kernel |
| debugging (in which the first 32 registers are gr64-gr95). */ |
| |
| #define REGISTER_NAMES \ |
| {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \ |
| "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \ |
| "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \ |
| "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127", \ |
| "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9", \ |
| "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \ |
| "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \ |
| "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \ |
| "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \ |
| "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \ |
| "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \ |
| "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \ |
| "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \ |
| "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \ |
| "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \ |
| "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \ |
| "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \ |
| "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \ |
| "lr124", "lr125", "lr126", "lr127", \ |
| "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9", \ |
| "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP", \ |
| "bp", "fc", "cr", "q", \ |
| "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", \ |
| "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1", \ |
| "alu", "ipc", "ipa", "ipb" } |
| |
| /* |
| * Converts an sdb register number to an internal gdb register number. |
| * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or... |
| * gr64->0...gr95->31, lr0->32...lr127->159. |
| */ |
| #define SDB_REG_TO_REGNUM(value) \ |
| (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \ |
| ((value) >= 128 && (value) <= 255) ? ((value) - 128 + LR0_REGNUM) : \ |
| (value)) |
| |
| /* |
| * Provide the processor register numbers of some registers that are |
| * expected/written in instructions that might change under different |
| * register sets. Namely, gcc can compile (-mkernel-registers) so that |
| * it uses gr64-gr95 in stead of gr96-gr127. |
| */ |
| #define MSP_HW_REGNUM 125 /* gr125 */ |
| #define RAB_HW_REGNUM 126 /* gr126 */ |
| |
| /* Convert Processor Special register #x to REGISTER_NAMES register # */ |
| #define SR_REGNUM(x) \ |
| ((x) < 15 ? VAB_REGNUM + (x) \ |
| : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128 \ |
| : (x) == 131 ? Q_REGNUM \ |
| : (x) == 132 ? ALU_REGNUM \ |
| : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133 \ |
| : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160 \ |
| : (x) == 164 ? EXO_REGNUM \ |
| : (error ("Internal error in SR_REGNUM"), 0)) |
| #define GR96_REGNUM 0 |
| |
| /* Define the return register separately, so it can be overridden for |
| kernel procedure calling conventions. */ |
| #define RETURN_REGNUM GR96_REGNUM |
| #define GR1_REGNUM 200 |
| /* This needs to be the memory stack pointer, not the register stack pointer, |
| to make call_function work right. */ |
| #define SP_REGNUM MSP_REGNUM |
| #define FP_REGNUM 33 /* lr1 */ |
| |
| /* Return register for transparent calling convention (gr122). */ |
| #define TPC_REGNUM (122 - 96 + GR96_REGNUM) |
| |
| /* Large Return Pointer (gr123). */ |
| #define LRP_REGNUM (123 - 96 + GR96_REGNUM) |
| |
| /* Static link pointer (gr124). */ |
| #define SLP_REGNUM (124 - 96 + GR96_REGNUM) |
| |
| /* Memory Stack Pointer (gr125). */ |
| #define MSP_REGNUM (125 - 96 + GR96_REGNUM) |
| |
| /* Register allocate bound (gr126). */ |
| #define RAB_REGNUM (126 - 96 + GR96_REGNUM) |
| |
| /* Register Free Bound (gr127). */ |
| #define RFB_REGNUM (127 - 96 + GR96_REGNUM) |
| |
| /* Register Stack Pointer. */ |
| #define RSP_REGNUM GR1_REGNUM |
| #define LR0_REGNUM 32 |
| #define BP_REGNUM 177 |
| #define FC_REGNUM 178 |
| #define CR_REGNUM 179 |
| #define Q_REGNUM 180 |
| #define VAB_REGNUM 181 |
| #define OPS_REGNUM (VAB_REGNUM + 1) |
| #define CPS_REGNUM (VAB_REGNUM + 2) |
| #define CFG_REGNUM (VAB_REGNUM + 3) |
| #define CHA_REGNUM (VAB_REGNUM + 4) |
| #define CHD_REGNUM (VAB_REGNUM + 5) |
| #define CHC_REGNUM (VAB_REGNUM + 6) |
| #define RBP_REGNUM (VAB_REGNUM + 7) |
| #define TMC_REGNUM (VAB_REGNUM + 8) |
| #define TMR_REGNUM (VAB_REGNUM + 9) |
| #define NPC_REGNUM (VAB_REGNUM + 10) /* pc0 */ |
| #define PC_REGNUM (VAB_REGNUM + 11) /* pc1 */ |
| #define PC2_REGNUM (VAB_REGNUM + 12) |
| #define MMU_REGNUM (VAB_REGNUM + 13) |
| #define LRU_REGNUM (VAB_REGNUM + 14) |
| #define FPE_REGNUM (VAB_REGNUM + 15) |
| #define INTE_REGNUM (VAB_REGNUM + 16) |
| #define FPS_REGNUM (VAB_REGNUM + 17) |
| #define EXO_REGNUM (VAB_REGNUM + 18) |
| /* gr1 is defined above as 200 = VAB_REGNUM + 19 */ |
| #define ALU_REGNUM (VAB_REGNUM + 20) |
| #define PS_REGNUM ALU_REGNUM |
| #define IPC_REGNUM (VAB_REGNUM + 21) |
| #define IPA_REGNUM (VAB_REGNUM + 22) |
| #define IPB_REGNUM (VAB_REGNUM + 23) |
| |
| #endif /* !defined(REGISTER_NAMES) */ |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register state, the array `registers'. */ |
| #define REGISTER_BYTES (NUM_REGS * 4) |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| #define REGISTER_BYTE(N) ((N)*4) |
| |
| /* Number of bytes of storage in the actual machine representation |
| for register N. */ |
| |
| /* All regs are 4 bytes. */ |
| |
| #define REGISTER_RAW_SIZE(N) (4) |
| |
| /* Number of bytes of storage in the program's representation |
| for register N. */ |
| |
| /* All regs are 4 bytes. */ |
| |
| #define REGISTER_VIRTUAL_SIZE(N) (4) |
| |
| /* Largest value REGISTER_RAW_SIZE can have. */ |
| |
| #define MAX_REGISTER_RAW_SIZE (4) |
| |
| /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| |
| #define MAX_REGISTER_VIRTUAL_SIZE (4) |
| |
| /* Return the GDB type object for the "standard" data type |
| of data in register N. */ |
| |
| #define REGISTER_VIRTUAL_TYPE(N) \ |
| (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM \ |
| || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM \ |
| || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM \ |
| || (N) == NPC_REGNUM || (N) == PC2_REGNUM) \ |
| ? lookup_pointer_type (builtin_type_void) : builtin_type_int) |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. This is called from call_function. */ |
| /* On the a29k the LRP points to the part of the structure beyond the first |
| 16 words. */ |
| #define STORE_STRUCT_RETURN(ADDR, SP) \ |
| write_register (LRP_REGNUM, (ADDR) + 16 * 4); |
| |
| /* Should call_function allocate stack space for a struct return? */ |
| /* On the a29k objects over 16 words require the caller to allocate space. */ |
| extern use_struct_convention_fn a29k_use_struct_convention; |
| #define USE_STRUCT_CONVENTION(gcc_p, type) a29k_use_struct_convention (gcc_p, type) |
| |
| /* Extract from an array REGBUF containing the (raw) register state |
| a function return value of type TYPE, and copy that, in virtual format, |
| into VALBUF. */ |
| |
| #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| { \ |
| int reg_length = TYPE_LENGTH (TYPE); \ |
| if (reg_length > 16 * 4) \ |
| { \ |
| reg_length = 16 * 4; \ |
| read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4, \ |
| TYPE_LENGTH (TYPE) - 16 * 4); \ |
| } \ |
| memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length); \ |
| } |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. */ |
| |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| { \ |
| int reg_length = TYPE_LENGTH (TYPE); \ |
| if (reg_length > 16 * 4) \ |
| { \ |
| reg_length = 16 * 4; \ |
| write_memory (read_register (LRP_REGNUM), \ |
| (char *)(VALBUF) + 16 * 4, \ |
| TYPE_LENGTH (TYPE) - 16 * 4); \ |
| } \ |
| write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF), \ |
| TYPE_LENGTH (TYPE)); \ |
| } |
| /* *INDENT-OFF* */ |
| /* The a29k user's guide documents well what the stacks look like. |
| But what isn't so clear there is how this interracts with the |
| symbols, or with GDB. |
| In the following saved_msp, saved memory stack pointer (which functions |
| as a memory frame pointer), means either |
| a register containing the memory frame pointer or, in the case of |
| functions with fixed size memory frames (i.e. those who don't use |
| alloca()), the result of the calculation msp + msize. |
| |
| LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp. |
| For high C, these are relative to msp (making alloca impossible). |
| LOC_REGISTER, LOC_REGPARM - The register number is the number at the |
| time the function is running (after the prologue), or in the case |
| of LOC_REGPARM, may be a register number in the range 160-175. |
| |
| The compilers do things like store an argument into memory, and then put out |
| a LOC_ARG for it, or put it into global registers and put out a |
| LOC_REGPARM. Thus is it important to execute the first line of |
| code (i.e. the line of the open brace, i.e. the prologue) of a function |
| before trying to print arguments or anything. |
| |
| The following diagram attempts to depict what is going on in memory |
| (see also the _a29k user's guide_) and also how that interacts with |
| GDB frames. We arbitrarily pick fci->frame to point the same place |
| as the register stack pointer; since we set it ourself in |
| INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_* |
| macros, it doesn't really matter exactly how we |
| do it. However, note that FRAME_FP is used in two ways in GDB: |
| (1) as a "magic cookie" which uniquely identifies frames (even over |
| calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK]) |
| as the value of SP_REGNUM before the dummy frame was pushed. These |
| two meanings would be incompatible for the a29k if we defined |
| CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it). |
| Also note that "lr1" below, while called a frame pointer |
| in the user's guide, has only one function: To determine whether |
| registers need to be filled in the function epilogue. |
| |
| Consider the code: |
| < call bar> |
| loc1: . . . |
| bar: sub gr1,gr1,rsize_b |
| . . . |
| add mfp,msp,0 |
| sub msp,msp,msize_b |
| . . . |
| < call foo > |
| loc2: . . . |
| foo: sub gr1,gr1,rsize_f |
| . . . |
| add mfp,msp,0 |
| sub msp,msp,msize_f |
| . . . |
| loc3: < suppose the inferior stops here > |
| |
| memory stack register stack |
| | | |____________| |
| | | |____loc1____| |
| +------->|___________| | | ^ |
| | | ^ | | locals_b | | |
| | | | | |____________| | |
| | | | | | | | rsize_b |
| | | | msize_b | | args_to_f | | |
| | | | | |____________| | |
| | | | | |____lr1_____| V |
| | | V | |____loc2____|<----------------+ |
| | +--->|___________|<---------mfp | ^ | |
| | | | ^ | | locals_f | | | |
| | | | | msize_f | |____________| | | |
| | | | | | | | | rsize_f | |
| | | | V | | args | | | |
| | | |___________|<msp |____________| | | |
| | | |_____lr1____| V | |
| | | |___garbage__| <- gr1 <----+ | |
| | | | | |
| | | | | |
| | | pc=loc3 | | |
| | | | | |
| | | | | |
| | | frame cache | | |
| | | |_________________| | | |
| | | |rsize=rsize_b | | | |
| | | |msize=msize_b | | | |
| +---|--------saved_msp | | | |
| | |frame------------------------------------|---+ |
| | |pc=loc2 | | |
| | |_________________| | |
| | |rsize=rsize_f | | |
| | |msize=msize_f | | |
| +--------saved_msp | | |
| |frame------------------------------------+ |
| |pc=loc3 | |
| |_________________| |
| |
| So, is that sufficiently confusing? Welcome to the 29000. |
| Notes: |
| * The frame for foo uses a memory frame pointer but the frame for |
| bar does not. In the latter case the saved_msp is |
| computed by adding msize to the saved_msp of the |
| next frame. |
| * msize is in the frame cache only for high C's sake. */ |
| /* *INDENT-ON* */ |
| |
| |
| void read_register_stack (); |
| long read_register_stack_integer (); |
| |
| #define FRAME_INIT_SAVED_REGS(fi) /*no-op */ |
| |
| #define EXTRA_FRAME_INFO \ |
| CORE_ADDR saved_msp; \ |
| unsigned int rsize; \ |
| unsigned int msize; \ |
| unsigned char flags; |
| |
| /* Bits for flags in EXTRA_FRAME_INFO */ |
| #define TRANSPARENT_FRAME 0x1 /* This is a transparent frame */ |
| #define MFP_USED 0x2 /* A memory frame pointer is used */ |
| |
| /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init |
| not only ->pc and ->frame, but all the extra stuff, when called from |
| get_prev_frame, that is. */ |
| #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci) |
| void init_extra_frame_info (); |
| |
| #define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci) |
| void init_frame_pc (); |
| |
| |
| /* FRAME_CHAIN takes a FRAME |
| and produces the frame's chain-pointer. |
| |
| However, if FRAME_CHAIN_VALID returns zero, |
| it means the given frame is the outermost one and has no caller. */ |
| |
| /* On the a29k, the nominal address of a frame is the address on the |
| register stack of the return address (the one next to the incoming |
| arguments, not down at the bottom so nominal address == stack pointer). |
| |
| GDB expects "nominal address" to equal contents of FP_REGNUM, |
| at least when it comes time to create the innermost frame. |
| However, that doesn't work for us, so when creating the innermost |
| frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO. */ |
| |
| /* These are mostly dummies for the a29k because INIT_FRAME_PC |
| sets prev->frame instead. */ |
| /* If rsize is zero, we must be at end of stack (or otherwise hosed). |
| If we don't check rsize, we loop forever if we see rsize == 0. */ |
| #define FRAME_CHAIN(thisframe) \ |
| ((thisframe)->rsize == 0 \ |
| ? 0 \ |
| : (thisframe)->frame + (thisframe)->rsize) |
| |
| /* Determine if the frame has a 'previous' and back-traceable frame. */ |
| #define FRAME_IS_UNCHAINED(frame) ((frame)->flags & TRANSPARENT_FRAME) |
| |
| /* Find the previous frame of a transparent routine. |
| * For now lets not try and trace through a transparent routine (we might |
| * have to assume that all transparent routines are traps). |
| */ |
| #define FIND_PREV_UNCHAINED_FRAME(frame) 0 |
| |
| /* Define other aspects of the stack frame. */ |
| |
| /* An expression that tells us whether the function invocation represented |
| by FI does not have a frame on the stack associated with it. */ |
| #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
| (frameless_look_for_prologue (FI)) |
| |
| /* Saved pc (i.e. return address). */ |
| #define FRAME_SAVED_PC(fraim) \ |
| (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4)) |
| |
| /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their |
| offsets being relative to the memory stack pointer (high C) or |
| saved_msp (gcc). */ |
| |
| #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi) |
| extern CORE_ADDR frame_locals_address (); |
| |
| /* Return number of args passed to a frame. |
| Can return -1, meaning no way to tell. */ |
| /* We tried going to the effort of finding the tags word and getting |
| the argcount field from it, to support debugging assembler code. |
| Problem was, the "argcount" field never did hold the argument |
| count. */ |
| #define FRAME_NUM_ARGS(fi) (-1) |
| |
| #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi) |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 0 |
| |
| /* Provide our own get_saved_register. HAVE_REGISTER_WINDOWS is insufficient |
| because registers get renumbered on the a29k without getting saved. */ |
| |
| struct frame_info; |
| void a29k_get_saved_register (char *raw_buffer, int *optimized, |
| CORE_ADDR * addrp, struct frame_info *frame, |
| int regnum, enum lval_type *lvalp); |
| #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \ |
| a29k_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) |
| |
| /* Call function stuff. */ |
| /* *INDENT-OFF* */ |
| /* The dummy frame looks like this (see also the general frame picture |
| above): |
| |
| register stack |
| |
| | | frame for function |
| | locals_sproc | executing at time |
| |________________| of call_function. |
| | | We must not disturb |
| | args_out_sproc | it. |
| memory stack |________________| |
| |____lr1_sproc___|<-+ |
| | | |__retaddr_sproc_| | <-- gr1 (at start) |
| |____________|<-msp 0 <-----------mfp_dummy_____| | |
| | | (at start) | save regs | | |
| | arg_slop | | pc0,pc1 | | |
| | | | pc2,lr0 sproc | | |
| | (16 words) | | gr96-gr124 | | |
| |____________|<-msp 1--after | sr160-sr162 | | |
| | | PUSH_DUMMY_FRAME| sr128-sr135 | | |
| | struct ret | |________________| | |
| | 17+ | | | | |
| |____________|<- lrp | args_out_dummy | | |
| | struct ret | | (16 words) | | |
| | 16 | |________________| | |
| | (16 words) | |____lr1_dummy___|--+ |
| |____________|<- msp 2--after |_retaddr_dummy__|<- gr1 after |
| | | struct ret | | PUSH_DUMMY_FRAME |
| | margs17+ | area allocated | locals_inf | |
| | | |________________| called |
| |____________|<- msp 4--when | | function's |
| | | inf called | args_out_inf | frame (set up |
| | margs16 | |________________| by called |
| | (16 words) | |_____lr1_inf____| function). |
| |____________|<- msp 3--after | . | |
| | | args pushed | . | |
| | | | . | |
| | | |
| |
| arg_slop: This area is so that when the call dummy adds 16 words to |
| the msp, it won't end up larger than mfp_dummy (it is needed in the |
| case where margs and struct_ret do not add up to at least 16 words). |
| struct ret: This area is allocated by GDB if the return value is more |
| than 16 words. struct ret_16 is not used on the a29k. |
| margs: Pushed by GDB. The call dummy copies the first 16 words to |
| args_out_dummy. |
| retaddr_sproc: Contains the PC at the time we call the function. |
| set by PUSH_DUMMY_FRAME and read by POP_FRAME. |
| retaddr_dummy: This points to a breakpoint instruction in the dummy. */ |
| /* *INDENT-ON* */ |
| |
| |
| |
| /* Rsize for dummy frame, in bytes. */ |
| |
| /* Bytes for outgoing args, lr1, and retaddr. */ |
| #define DUMMY_ARG (2 * 4 + 16 * 4) |
| |
| /* Number of special registers (sr128-) to save. */ |
| #define DUMMY_SAVE_SR128 8 |
| /* Number of special registers (sr160-) to save. */ |
| #define DUMMY_SAVE_SR160 3 |
| /* Number of general (gr96- or gr64-) registers to save. */ |
| #define DUMMY_SAVE_GREGS 29 |
| |
| #define DUMMY_FRAME_RSIZE \ |
| (4 /* mfp_dummy */ \ |
| + 4 * 4 /* pc0, pc1, pc2, lr0 */ \ |
| + DUMMY_SAVE_GREGS * 4 \ |
| + DUMMY_SAVE_SR160 * 4 \ |
| + DUMMY_SAVE_SR128 * 4 \ |
| + DUMMY_ARG \ |
| + 4 /* pad to doubleword */ ) |
| |
| /* Push an empty stack frame, to record the current PC, etc. */ |
| |
| #define PUSH_DUMMY_FRAME push_dummy_frame() |
| extern void push_dummy_frame (); |
| |
| /* Discard from the stack the innermost frame, |
| restoring all saved registers. */ |
| |
| #define POP_FRAME pop_frame() |
| extern void pop_frame (); |
| |
| /* This sequence of words is the instructions |
| mtsrim cr, 15 |
| loadm 0, 0, lr2, msp ; load first 16 words of arguments into registers |
| add msp, msp, 16 * 4 ; point to the remaining arguments |
| CONST_INSN: |
| const lr0,inf ; (replaced by half of target addr) |
| consth lr0,inf ; (replaced by other half of target addr) |
| calli lr0, lr0 |
| aseq 0x40,gr1,gr1 ; nop |
| BREAKPT_INSN: |
| asneq 0x50,gr1,gr1 ; breakpoint (replaced by local breakpoint insn) |
| */ |
| |
| #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER |
| #define BS(const) const |
| #else |
| #define BS(const) (((const) & 0xff) << 24) | \ |
| (((const) & 0xff00) << 8) | \ |
| (((const) & 0xff0000) >> 8) | \ |
| (((const) & 0xff000000) >> 24) |
| #endif |
| |
| /* Position of the "const" and blkt instructions within CALL_DUMMY in bytes. */ |
| #define CONST_INSN (3 * 4) |
| #define BREAKPT_INSN (7 * 4) |
| #define CALL_DUMMY { \ |
| BS(0x0400870f),\ |
| BS(0x36008200|(MSP_HW_REGNUM)), \ |
| BS(0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16)), \ |
| BS(0x03ff80ff), \ |
| BS(0x02ff80ff), \ |
| BS(0xc8008080), \ |
| BS(0x70400101), \ |
| BS(0x72500101)} |
| #define CALL_DUMMY_LENGTH (8 * 4) |
| |
| #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
| |
| /* Helper macro for FIX_CALL_DUMMY. WORDP is a long * which points to a |
| word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with |
| bits 0-7 and 8-15 of DATA (which is in host byte order). */ |
| |
| #if TARGET_BYTE_ORDER == BIG_ENDIAN |
| #define STUFF_I16(WORDP, DATA) \ |
| { \ |
| *((char *)(WORDP) + 3) = ((DATA) & 0xff);\ |
| *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\ |
| } |
| #else /* Target is little endian. */ |
| #define STUFF_I16(WORDP, DATA) \ |
| { |
| *(char *) (WORDP) = ((DATA) & 0xff); |
| *((char *) (WORDP) + 2) = (((DATA) >> 8) & 0xff); |
| } |
| #endif /* Target is little endian. */ |
| |
| /* Insert the specified number of args and function address |
| into a call sequence of the above form stored at DUMMYNAME. */ |
| |
| /* Currently this stuffs in the address of the function that we are calling. |
| Since different a29k systems use different breakpoint instructions, it |
| also stuffs BREAKPOINT in the right place (to avoid having to |
| duplicate CALL_DUMMY in each tm-*.h file). */ |
| |
| #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
| {\ |
| STUFF_I16((char *)dummyname + CONST_INSN, fun); \ |
| STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16); \ |
| /* FIXME memcpy ((char *)(dummyname) + BREAKPT_INSN, break_insn, 4); */ \ |
| } |
| |
| /* a29k architecture has separate data & instruction memories -- wired to |
| different pins on the chip -- and can't execute the data memory. |
| Also, there should be space after text_end; |
| we won't get a SIGSEGV or scribble on data space. */ |
| |
| #define CALL_DUMMY_LOCATION AFTER_TEXT_END |
| |
| /* Because of this, we need (as a kludge) to know the addresses of the |
| text section. */ |
| |
| #define NEED_TEXT_START_END 1 |
| |
| /* How to translate register numbers in the .stab's into gdb's internal register |
| numbers. We don't translate them, but we warn if an invalid register |
| number is seen. Note that FIXME, we use the value "sym" as an implicit |
| argument in printing the error message. It happens to be available where |
| this macro is used. (This macro definition appeared in a late revision |
| of gdb-3.91.6 and is not well tested. Also, it should be a "complaint".) */ |
| |
| #define STAB_REG_TO_REGNUM(num) \ |
| (((num) > LR0_REGNUM + 127) \ |
| ? fprintf(stderr, \ |
| "Invalid register number %d in symbol table entry for %s\n", \ |
| (num), SYMBOL_SOURCE_NAME (sym)), (num) \ |
| : (num)) |
| |
| extern enum a29k_processor_types |
| { |
| a29k_unknown, |
| |
| /* Bit 0x400 of the CPS does *not* identify freeze mode, i.e. 29000, |
| 29030, etc. */ |
| a29k_no_freeze_mode, |
| |
| /* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050. */ |
| a29k_freeze_mode |
| } |
| processor_type; |
| |
| /* We need three arguments for a general frame specification for the |
| "frame" or "info frame" command. */ |
| |
| #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv) |
| extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *); |
