| /* Definitions to make GDB run on an Alpha box under OSF1. This is |
| also used by the Alpha/Netware and Alpha/Linux targets. |
| Copyright 1993, 1994, 1995, 1996 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. */ |
| |
| #ifndef TM_ALPHA_H |
| #define TM_ALPHA_H |
| |
| #include "bfd.h" |
| #include "coff/sym.h" /* Needed for PDR below. */ |
| #include "coff/symconst.h" |
| |
| struct frame_info; |
| struct type; |
| struct value; |
| struct symbol; |
| |
| #if !defined (TARGET_BYTE_ORDER) |
| #define TARGET_BYTE_ORDER LITTLE_ENDIAN |
| #endif |
| |
| /* Redefine some target bit sizes from the default. */ |
| |
| #define TARGET_LONG_BIT 64 |
| #define TARGET_LONG_LONG_BIT 64 |
| #define TARGET_PTR_BIT 64 |
| |
| /* Floating point is IEEE compliant */ |
| #define IEEE_FLOAT (1) |
| |
| /* Number of traps that happen between exec'ing the shell |
| * to run an inferior, and when we finally get to |
| * the inferior code. This is 2 on most implementations. |
| */ |
| #define START_INFERIOR_TRAPS_EXPECTED 3 |
| |
| /* 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) (alpha_skip_prologue(pc, 0)) |
| extern CORE_ADDR alpha_skip_prologue PARAMS ((CORE_ADDR addr, int lenient)); |
| |
| /* Immediately after a function call, return the saved pc. |
| Can't always 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) alpha_saved_pc_after_call(frame) |
| extern CORE_ADDR |
| alpha_saved_pc_after_call PARAMS ((struct frame_info *)); |
| |
| /* Are we currently handling a signal ? */ |
| |
| #define IN_SIGTRAMP(pc, name) ((name) && STREQ ("__sigtramp", (name))) |
| |
| /* Stack grows downward. */ |
| |
| #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) |
| |
| #define BREAKPOINT {0x80, 0, 0, 0} /* call_pal bpt */ |
| |
| /* Amount PC must be decremented by after a breakpoint. |
| This is often the number of bytes in BREAKPOINT |
| but not always. */ |
| |
| #ifndef DECR_PC_AFTER_BREAK |
| #define DECR_PC_AFTER_BREAK 4 |
| #endif |
| |
| /* 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 8 |
| |
| /* Number of machine registers */ |
| |
| #define NUM_REGS 66 |
| |
| /* Initializer for an array of names of registers. |
| There should be NUM_REGS strings in this initializer. */ |
| |
| #define REGISTER_NAMES \ |
| { "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", \ |
| "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", \ |
| "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", \ |
| "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", \ |
| "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ |
| "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ |
| "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\ |
| "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr",\ |
| "pc", "vfp", \ |
| } |
| |
| /* Register numbers of various important registers. |
| Note that most of these values are "real" register numbers, |
| and correspond to the general registers of the machine, |
| and FP_REGNUM is a "phony" register number which is too large |
| to be an actual register number as far as the user is concerned |
| but serves to get the desired value when passed to read_register. */ |
| |
| #define V0_REGNUM 0 /* Function integer return value */ |
| #define T7_REGNUM 8 /* Return address register for OSF/1 __add* */ |
| #define GCC_FP_REGNUM 15 /* Used by gcc as frame register */ |
| #define A0_REGNUM 16 /* Loc of first arg during a subr call */ |
| #define T9_REGNUM 23 /* Return address register for OSF/1 __div* */ |
| #define T12_REGNUM 27 /* Contains start addr of current proc */ |
| #define SP_REGNUM 30 /* Contains address of top of stack */ |
| #define RA_REGNUM 26 /* Contains return address value */ |
| #define ZERO_REGNUM 31 /* Read-only register, always 0 */ |
| #define FP0_REGNUM 32 /* Floating point register 0 */ |
| #define FPA0_REGNUM 48 /* First float arg during a subr call */ |
| #define FPCR_REGNUM 63 /* Floating point control register */ |
| #define PC_REGNUM 64 /* Contains program counter */ |
| #define FP_REGNUM 65 /* Virtual frame pointer */ |
| |
| #define CANNOT_FETCH_REGISTER(regno) \ |
| ((regno) == FP_REGNUM || (regno) == ZERO_REGNUM) |
| #define CANNOT_STORE_REGISTER(regno) \ |
| ((regno) == FP_REGNUM || (regno) == ZERO_REGNUM) |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register state, the array `registers'. */ |
| #define REGISTER_BYTES (NUM_REGS * 8) |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| |
| #define REGISTER_BYTE(N) ((N) * 8) |
| |
| /* Number of bytes of storage in the actual machine representation |
| for register N. On Alphas, all regs are 8 bytes. */ |
| |
| #define REGISTER_RAW_SIZE(N) 8 |
| |
| /* Number of bytes of storage in the program's representation |
| for register N. On Alphas, all regs are 8 bytes. */ |
| |
| #define REGISTER_VIRTUAL_SIZE(N) 8 |
| |
| /* Largest value REGISTER_RAW_SIZE can have. */ |
| |
| #define MAX_REGISTER_RAW_SIZE 8 |
| |
| /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| |
| #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| |
| /* Nonzero if register N requires conversion |
| from raw format to virtual format. |
| The alpha needs a conversion between register and memory format if |
| the register is a floating point register and |
| memory format is float, as the register format must be double |
| or |
| memory format is an integer with 4 bytes or less, as the representation |
| of integers in floating point registers is different. */ |
| |
| #define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM && (N) < FP0_REGNUM + 31) |
| |
| /* Convert data from raw format for register REGNUM in buffer FROM |
| to virtual format with type TYPE in buffer TO. */ |
| |
| #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM, TYPE, FROM, TO) \ |
| alpha_register_convert_to_virtual (REGNUM, TYPE, FROM, TO) |
| extern void |
| alpha_register_convert_to_virtual PARAMS ((int, struct type *, char *, char *)); |
| |
| /* Convert data from virtual format with type TYPE in buffer FROM |
| to raw format for register REGNUM in buffer TO. */ |
| |
| #define REGISTER_CONVERT_TO_RAW(TYPE, REGNUM, FROM, TO) \ |
| alpha_register_convert_to_raw (TYPE, REGNUM, FROM, TO) |
| extern void |
| alpha_register_convert_to_raw PARAMS ((struct type *, int, char *, char *)); |
| |
| /* Return the GDB type object for the "standard" data type |
| of data in register N. */ |
| |
| #define REGISTER_VIRTUAL_TYPE(N) \ |
| (((N) >= FP0_REGNUM && (N) < FP0_REGNUM+31) \ |
| ? builtin_type_double : builtin_type_long) \ |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. Handled by alpha_push_arguments. */ |
| |
| #define STORE_STRUCT_RETURN(addr, sp) |
| /**/ |
| |
| /* 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) \ |
| alpha_extract_return_value(TYPE, REGBUF, VALBUF) |
| extern void |
| alpha_extract_return_value PARAMS ((struct type *, char *, char *)); |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. */ |
| |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| alpha_store_return_value(TYPE, VALBUF) |
| extern void |
| alpha_store_return_value PARAMS ((struct type *, char *)); |
| |
| /* Extract from an array REGBUF containing the (raw) register state |
| the address in which a function should return its structure value, |
| as a CORE_ADDR (or an expression that can be used as one). */ |
| /* The address is passed in a0 upon entry to the function, but when |
| the function exits, the compiler has copied the value to v0. This |
| convention is specified by the System V ABI, so I think we can rely |
| on it. */ |
| |
| #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ |
| (extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \ |
| REGISTER_RAW_SIZE (V0_REGNUM))) |
| |
| /* Structures are returned by ref in extra arg0 */ |
| #define USE_STRUCT_CONVENTION(gcc_p, type) 1 |
| |
| |
| /* Describe the pointer in each stack frame to the previous stack frame |
| (its caller). */ |
| |
| /* FRAME_CHAIN takes a frame's nominal address |
| and produces the frame's chain-pointer. */ |
| |
| #define FRAME_CHAIN(thisframe) (CORE_ADDR) alpha_frame_chain (thisframe) |
| extern CORE_ADDR alpha_frame_chain PARAMS ((struct frame_info *)); |
| |
| /* 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. */ |
| /* We handle this differently for alpha, and maybe we should not */ |
| |
| #define FRAMELESS_FUNCTION_INVOCATION(FI) (0) |
| |
| /* Saved Pc. */ |
| |
| #define FRAME_SAVED_PC(FRAME) (alpha_frame_saved_pc(FRAME)) |
| extern CORE_ADDR |
| alpha_frame_saved_pc PARAMS ((struct frame_info *)); |
| |
| /* The alpha has two different virtual pointers for arguments and locals. |
| |
| The virtual argument pointer is pointing to the bottom of the argument |
| transfer area, which is located immediately below the virtual frame |
| pointer. Its size is fixed for the native compiler, it is either zero |
| (for the no arguments case) or large enough to hold all argument registers. |
| gcc uses a variable sized argument transfer area. As it has |
| to stay compatible with the native debugging tools it has to use the same |
| virtual argument pointer and adjust the argument offsets accordingly. |
| |
| The virtual local pointer is localoff bytes below the virtual frame |
| pointer, the value of localoff is obtained from the PDR. */ |
| |
| #define ALPHA_NUM_ARG_REGS 6 |
| |
| #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame - (ALPHA_NUM_ARG_REGS * 8)) |
| |
| #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame - (fi)->localoff) |
| |
| /* Return number of args passed to a frame. |
| Can return -1, meaning no way to tell. */ |
| |
| #define FRAME_NUM_ARGS(fi) (-1) |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 0 |
| |
| /* Put here the code to store, into a struct frame_saved_regs, |
| the addresses of the saved registers of frame described by FRAME_INFO. |
| This includes special registers such as pc and fp saved in special |
| ways in the stack frame. sp is even more special: |
| the address we return for it IS the sp for the next frame. */ |
| |
| extern void alpha_find_saved_regs PARAMS ((struct frame_info *)); |
| |
| #define FRAME_INIT_SAVED_REGS(frame_info) \ |
| do { \ |
| if ((frame_info)->saved_regs == NULL) \ |
| alpha_find_saved_regs (frame_info); \ |
| (frame_info)->saved_regs[SP_REGNUM] = (frame_info)->frame; \ |
| } while (0) |
| |
| |
| /* Things needed for making the inferior call functions. */ |
| |
| #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ |
| (alpha_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))) |
| extern CORE_ADDR |
| alpha_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR)); |
| |
| /* Push an empty stack frame, to record the current PC, etc. */ |
| |
| #define PUSH_DUMMY_FRAME alpha_push_dummy_frame() |
| extern void |
| alpha_push_dummy_frame PARAMS ((void)); |
| |
| /* Discard from the stack the innermost frame, restoring all registers. */ |
| |
| #define POP_FRAME alpha_pop_frame() |
| extern void |
| alpha_pop_frame PARAMS ((void)); |
| |
| /* Alpha OSF/1 inhibits execution of code on the stack. |
| But there is no need for a dummy on the alpha. PUSH_ARGUMENTS |
| takes care of all argument handling and bp_call_dummy takes care |
| of stopping the dummy. */ |
| |
| #define CALL_DUMMY_LOCATION AT_ENTRY_POINT |
| |
| /* On the Alpha the call dummy code is never copied to user space, |
| stopping the user call is achieved via a bp_call_dummy breakpoint. |
| But we need a fake CALL_DUMMY definition to enable the proper |
| call_function_by_hand and to avoid zero length array warnings |
| in valops.c */ |
| |
| #define CALL_DUMMY { 0 } /* Content doesn't matter. */ |
| |
| #define CALL_DUMMY_START_OFFSET (0) |
| |
| #define CALL_DUMMY_BREAKPOINT_OFFSET (0) |
| |
| extern CORE_ADDR alpha_call_dummy_address PARAMS ((void)); |
| #define CALL_DUMMY_ADDRESS() alpha_call_dummy_address() |
| |
| /* Insert the specified number of args and function address |
| into a call sequence of the above form stored at DUMMYNAME. |
| We only have to set RA_REGNUM to the dummy breakpoint address |
| and T12_REGNUM (the `procedure value register') to the function address. */ |
| |
| #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
| { \ |
| CORE_ADDR bp_address = CALL_DUMMY_ADDRESS (); \ |
| if (bp_address == 0) \ |
| error ("no place to put call"); \ |
| write_register (RA_REGNUM, bp_address); \ |
| write_register (T12_REGNUM, fun); \ |
| } |
| |
| /* There's a mess in stack frame creation. See comments in blockframe.c |
| near reference to INIT_FRAME_PC_FIRST. */ |
| |
| #define INIT_FRAME_PC(fromleaf, prev) /* nada */ |
| |
| #define INIT_FRAME_PC_FIRST(fromleaf, prev) \ |
| (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \ |
| (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ()); |
| |
| /* Special symbol found in blocks associated with routines. We can hang |
| alpha_extra_func_info_t's off of this. */ |
| |
| #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__" |
| extern void ecoff_relocate_efi PARAMS ((struct symbol *, CORE_ADDR)); |
| |
| /* Specific information about a procedure. |
| This overlays the ALPHA's PDR records, |
| alpharead.c (ab)uses this to save memory */ |
| |
| typedef struct alpha_extra_func_info |
| { |
| long numargs; /* number of args to procedure (was iopt) */ |
| PDR pdr; /* Procedure descriptor record */ |
| } |
| *alpha_extra_func_info_t; |
| |
| /* Define the extra_func_info that mipsread.c needs. |
| FIXME: We should define our own PDR interface, perhaps in a separate |
| header file. This would get rid of the <bfd.h> inclusion in all sources |
| and would abstract the mips/alpha interface from ecoff. */ |
| #define mips_extra_func_info alpha_extra_func_info |
| #define mips_extra_func_info_t alpha_extra_func_info_t |
| |
| #define EXTRA_FRAME_INFO \ |
| int localoff; \ |
| int pc_reg; \ |
| alpha_extra_func_info_t proc_desc; |
| |
| #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci) |
| extern void |
| init_extra_frame_info PARAMS ((struct frame_info *)); |
| |
| #define PRINT_EXTRA_FRAME_INFO(fi) \ |
| { \ |
| if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \ |
| printf_filtered (" frame pointer is at %s+%ld\n", \ |
| REGISTER_NAME (fi->proc_desc->pdr.framereg), \ |
| fi->proc_desc->pdr.frameoffset); \ |
| } |
| |
| /* It takes two values to specify a frame on the ALPHA. Sigh. |
| |
| In fact, at the moment, the *PC* is the primary value that sets up |
| a frame. The PC is looked up to see what function it's in; symbol |
| information from that function tells us which register is the frame |
| pointer base, and what offset from there is the "virtual frame pointer". |
| (This is usually an offset from SP.) FIXME -- this should be cleaned |
| up so that the primary value is the SP, and the PC is used to disambiguate |
| multiple functions with the same SP that are at different stack levels. */ |
| |
| #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv) |
| extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *)); |
| |
| /* This is used by heuristic_proc_start. It should be shot it the head. */ |
| #ifndef VM_MIN_ADDRESS |
| #define VM_MIN_ADDRESS (CORE_ADDR)0x120000000 |
| #endif |
| |
| /* If PC is in a shared library trampoline code, return the PC |
| where the function itself actually starts. If not, return 0. */ |
| #define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc) |
| |
| /* If the current gcc for for this target does not produce correct debugging |
| information for float parameters, both prototyped and unprototyped, then |
| define this macro. This forces gdb to always assume that floats are |
| passed as doubles and then converted in the callee. |
| |
| For the alpha, it appears that the debug info marks the parameters as |
| floats regardless of whether the function is prototyped, but the actual |
| values are always passed in as doubles. Thus by setting this to 1, both |
| types of calls will work. */ |
| |
| #define COERCE_FLOAT_TO_DOUBLE(formal, actual) (1) |
| |
| /* Return TRUE if procedure descriptor PROC is a procedure descriptor |
| that refers to a dynamically generated sigtramp function. |
| |
| OSF/1 doesn't use dynamic sigtramp functions, so this is always |
| FALSE. */ |
| |
| #define PROC_DESC_IS_DYN_SIGTRAMP(proc) (0) |
| #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc) |
| |
| /* If PC is inside a dynamically generated sigtramp function, return |
| how many bytes the program counter is beyond the start of that |
| function. Otherwise, return a negative value. |
| |
| OSF/1 doesn't use dynamic sigtramp functions, so this always |
| returns -1. */ |
| |
| #define DYNAMIC_SIGTRAMP_OFFSET(pc) (-1) |
| |
| /* Translate a signal handler frame into the address of the sigcontext |
| structure. */ |
| |
| #define SIGCONTEXT_ADDR(frame) \ |
| (read_memory_integer ((frame)->next ? frame->next->frame : frame->frame, 8)) |
| |
| /* If FRAME refers to a sigtramp frame, return the address of the next |
| frame. */ |
| |
| #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc) \ |
| (alpha_osf_skip_sigtramp_frame (frame, pc)) |
| extern CORE_ADDR alpha_osf_skip_sigtramp_frame PARAMS ((struct frame_info *, CORE_ADDR)); |
| |
| #endif /* TM_ALPHA_H */ |