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Diffstat (limited to 'gdb/config/alpha/tm-alpha.h')
| -rw-r--r-- | gdb/config/alpha/tm-alpha.h | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/gdb/config/alpha/tm-alpha.h b/gdb/config/alpha/tm-alpha.h new file mode 100644 index 0000000..d9b9812 --- /dev/null +++ b/gdb/config/alpha/tm-alpha.h @@ -0,0 +1,479 @@ +/* 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" + +#ifdef __STDC__ +struct frame_info; +struct type; +struct value; +struct symbol; +#endif + +#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 + +/* 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) +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", "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 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 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 + 32) + +/* 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+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) +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. */ + + +/* 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 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(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. */ + +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) \ + sp = 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+%d\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 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 */ |