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-/* Parameters for target machine of AMD 29000, for GDB, the GNU debugger.
- Copyright 1990, 1991, 1993 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., 675 Mass Ave, Cambridge, MA 02139, 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 29k machines/systems, the
- machine/system-specific parts should be removed from this file (a
- la tm-68k.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
-
-/* 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) \
- { pc = skip_prologue (pc); }
-CORE_ADDR 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) (read_register (LR0_REGNUM))
-
-/* I'm not sure about the exact value of this, but based on looking
- at the stack pointer when we get to main this seems to be right.
-
- This is the register stack; We call it "CONTROL" in GDB for consistency
- with Pyramid. */
-#define CONTROL_END_ADDR 0x80200000
-
-/* Memory stack. This is for the default register stack size, which is
- only 0x800 bytes. Perhaps we should let the user specify stack sizes
- (and tell EBMON with the "ZS" command). */
-#define STACK_END_ADDR 0x801ff800
-
-/* Stack grows downward. */
-
-#define INNER_THAN <
-
-/* Stack must be aligned on 32-bit word boundaries. */
-#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
-
-/* Nonzero if instruction at PC is a return instruction.
- On the 29k, this is a "jmpi l0" instruction. */
-
-#define ABOUT_TO_RETURN(pc) \
- ((read_memory_integer (pc, 4) & 0xff0000ff) == 0xc0000080)
-
-/* Return 1 if P points to an invalid floating point value. */
-
-#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
-
-/* Say how long (ordinary) registers are. */
-
-#define REGISTER_TYPE long
-
-/* 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 */
-/* 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)
-
-/* Nonzero if register N requires conversion
- from raw format to virtual format. */
-
-#define REGISTER_CONVERTIBLE(N) (0)
-
-/* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
-{ bcopy ((FROM), (TO), 4); }
-
-/* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
-{ bcopy ((FROM), (TO), 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 29k 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 29k objects over 16 words require the caller to allocate space. */
-#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16 * 4)
-
-/* 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); \
- } \
- bcopy (((int *)(REGBUF))+RETURN_REGNUM, (VALBUF), 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)); \
- }
-
-/* The am29k 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 _am29k 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 29k 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. */
-
-void read_register_stack ();
-long read_register_stack_integer ();
-
-#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 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_info, 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 29k, 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 29k because INIT_FRAME_PC
- sets prev->frame instead. */
-#define FRAME_CHAIN(thisframe) ((thisframe)->frame + (thisframe)->rsize)
-
-/* Determine if the frame has a 'previous' and back-traceable frame. */
-#define FRAME_IS_UNCHAINED(frame) ((frame)->flags & TRANSPARENT)
-
-/* 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. */
-
-/* A macro that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
-#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
- (FRAMELESS) = 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. */
-/* While we could go the effort of finding the tags word and getting
- the argcount field from it,
- (1) It only counts arguments in registers, i.e. the first 16 words
- of arguments
- (2) It gives the number of arguments the function was declared with
- not how many it was called with (or some variation, like all 16
- words for varadic functions). This makes argcount pretty much
- redundant with -g info, even for varadic functions.
- So don't bother. */
-#define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -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 29k without getting saved. */
-
-#define GET_SAVED_REGISTER
-
-/* Call function stuff. */
-
-/* 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 | |
- | (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 29k.
- 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. */
-
-/* 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 */ \
- + 2 * 4 /* pc0, pc1 */ \
- + 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 29k 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); */ \
- }
-
-/* 29k 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
-
-/* 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))
generated by cgit v1.1 at 2024-12-13 08:48:18 +0000