/* Definitions to make GDB run on an Alpha box under OSF1. Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "bfd.h" #include "coff/sym.h" /* Needed for PDR below. */ #include "coff/symconst.h" #if !defined (TARGET_BYTE_ORDER) #define TARGET_BYTE_ORDER LITTLE_ENDIAN #endif /* Redefine some target bit sizes from the default. */ #undef TARGET_LONG_BIT #define TARGET_LONG_BIT 64 #undef TARGET_LONG_LONG_BIT #define TARGET_LONG_LONG_BIT 64 #undef TARGET_PTR_BIT #define TARGET_PTR_BIT 64 /* Floating point is IEEE compliant */ #define IEEE_FLOAT /* 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) 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) #ifdef __STDC__ struct frame_info; #endif 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 < #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. */ #define DECR_PC_AFTER_BREAK 4 /* Nonzero if instruction at PC is a return instruction. "ret $zero,($ra),1" on alpha. */ #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x6bfa8001) /* Return 1 if P points to an invalid floating point value. */ #define INVALID_FLOAT(p,l) 0 /* Say how long (all) registers are. This is unused for the alpha, but the define is necessary. */ #define REGISTER_TYPE long /* 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", "f31",\ "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 GCC_FP_REGNUM 15 /* Used by gcc as frame register */ #define A0_REGNUM 16 /* Loc of first arg during a subr call */ #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 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. */ #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) \ memcpy ((TO), (FROM), 8); /* Convert data from virtual format for register REGNUM to raw format for register REGNUM. */ #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ memcpy ((TO), (FROM), 8); /* 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+32) \ ? 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) #ifdef __STDC__ struct type; #endif 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) (FRAME_ADDR)alpha_frame_chain(thisframe) extern CORE_ADDR alpha_frame_chain PARAMS ((struct frame_info *)); /* 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. */ /* We handle this differently for alpha, and maybe we should not */ #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 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 offsets for the arguments and locals are off a virtual pointer to the argument transfer area. The argument transfer area is immediately below the virtual frame pointer, its size is in localoff from the PDR. */ #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame - (fi)->localoff) #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(num, fi) ((num) = -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. */ #define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs) ( \ (frame_saved_regs) = *(fi)->saved_regs, \ (frame_saved_regs).regs[SP_REGNUM] = (fi)->frame) /* Things needed for making the inferior call functions. */ #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ sp = alpha_push_arguments(nargs, args, sp, struct_return, struct_addr) #ifdef __STDC__ struct value; #endif 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 /* 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 {\ 0x80, /* call_pal bpt */ \ } #define CALL_DUMMY_START_OFFSET (0) #define CALL_DUMMY_BREAKPOINT_OFFSET (0) /* 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 = entry_point_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__" /* 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 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; \ alpha_extra_func_info_t proc_desc; \ struct frame_saved_regs *saved_regs; #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+%d\n", \ reg_names[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) /* FIXME: Depends on equivalence between FRAME and "struct frame_info *", and equivalence between CORE_ADDR and FRAME_ADDR. */ extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));