--- /dev/null
+/* 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
+
+\f
+/* 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)
+
+\f
+/* 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 <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; \
+ 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 *));
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