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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/config/rs6000/tm-rs6000.h
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/config/rs6000/tm-rs6000.h')
-rw-r--r--gdb/config/rs6000/tm-rs6000.h564
1 files changed, 564 insertions, 0 deletions
diff --git a/gdb/config/rs6000/tm-rs6000.h b/gdb/config/rs6000/tm-rs6000.h
new file mode 100644
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@@ -0,0 +1,564 @@
+/* Parameters for target execution on an RS6000, for GDB, the GNU debugger.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1997
+ Free Software Foundation, Inc.
+ Contributed by IBM Corporation.
+
+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. */
+
+#ifdef __STDC__ /* Forward decls for prototypes */
+struct frame_info;
+struct type;
+struct value;
+#endif
+
+/* Minimum possible text address in AIX */
+
+#define TEXT_SEGMENT_BASE 0x10000000
+
+/* Load segment of a given pc value. */
+
+#define PC_LOAD_SEGMENT(PC) pc_load_segment_name(PC)
+extern char *pc_load_segment_name PARAMS ((CORE_ADDR));
+
+/* AIX cc seems to get this right. */
+
+#define BELIEVE_PCC_PROMOTION 1
+
+/* return true if a given `pc' value is in `call dummy' function. */
+/* FIXME: This just checks for the end of the stack, which is broken
+ for things like stepping through gcc nested function stubs. */
+#define PC_IN_CALL_DUMMY(STOP_PC, STOP_SP, STOP_FRAME_ADDR) \
+ (STOP_SP < STOP_PC && STOP_PC < STACK_END_ADDR)
+
+#if 0
+extern unsigned int text_start, data_start;
+extern char *corefile;
+#endif
+extern int inferior_pid;
+
+/* We are missing register descriptions in the system header files. Sigh! */
+
+struct regs {
+ int gregs [32]; /* general purpose registers */
+ int pc; /* program conter */
+ int ps; /* processor status, or machine state */
+};
+
+struct fp_status {
+ double fpregs [32]; /* floating GP registers */
+};
+
+
+/* To be used by skip_prologue. */
+
+struct rs6000_framedata {
+ int offset; /* total size of frame --- the distance
+ by which we decrement sp to allocate
+ the frame */
+ int saved_gpr; /* smallest # of saved gpr */
+ int saved_fpr; /* smallest # of saved fpr */
+ int alloca_reg; /* alloca register number (frame ptr) */
+ char frameless; /* true if frameless functions. */
+ char nosavedpc; /* true if pc not saved. */
+ int gpr_offset; /* offset of saved gprs from prev sp */
+ int fpr_offset; /* offset of saved fprs from prev sp */
+ int lr_offset; /* offset of saved lr */
+ int cr_offset; /* offset of saved cr */
+};
+
+/* Define the byte order of the machine. */
+
+#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
+
+/* AIX's assembler doesn't grok dollar signs in identifiers.
+ So we use dots instead. This item must be coordinated with G++. */
+#undef CPLUS_MARKER
+#define CPLUS_MARKER '.'
+
+/* 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) \
+do { \
+ struct rs6000_framedata _frame; \
+ pc = skip_prologue (pc, &_frame); \
+} while (0)
+
+extern CORE_ADDR skip_prologue PARAMS((CORE_ADDR, struct rs6000_framedata *));
+
+
+/* If PC is in some function-call trampoline code, return the PC
+ where the function itself actually starts. If not, return NULL. */
+
+#define SKIP_TRAMPOLINE_CODE(pc) skip_trampoline_code (pc)
+extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR));
+
+/* Number of trap signals we need to skip over, once the inferior process
+ starts running. */
+
+#define START_INFERIOR_TRAPS_EXPECTED 2
+
+/* AIX has a couple of strange returns from wait(). */
+
+#define CHILD_SPECIAL_WAITSTATUS(ourstatus, hoststatus) ( \
+ /* "stop after load" status. */ \
+ (hoststatus) == 0x57c ? (ourstatus)->kind = TARGET_WAITKIND_LOADED, 1 : \
+ \
+ /* signal 0. I have no idea why wait(2) returns with this status word. */ \
+ /* It looks harmless. */ \
+ (hoststatus) == 0x7f ? (ourstatus)->kind = TARGET_WAITKIND_SPURIOUS, 1 : \
+ \
+ /* A normal waitstatus. Let the usual macros deal with it. */ \
+ 0)
+
+/* In xcoff, we cannot process line numbers when we see them. This is
+ mainly because we don't know the boundaries of the include files. So,
+ we postpone that, and then enter and sort(?) the whole line table at
+ once, when we are closing the current symbol table in end_symtab(). */
+
+#define PROCESS_LINENUMBER_HOOK() aix_process_linenos ()
+extern void aix_process_linenos PARAMS ((void));
+
+/* 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 (LR_REGNUM)
+
+/* Address of end of stack space. */
+
+#define STACK_END_ADDR 0x2ff80000
+
+/* Stack grows downward. */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* This is how arguments pushed onto stack or passed in registers.
+ Stack must be aligned on 64-bit boundaries when synthesizing
+ function calls. We don't need STACK_ALIGN, PUSH_ARGUMENTS will
+ handle it. */
+
+#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
+ sp = push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))
+extern CORE_ADDR push_arguments PARAMS ((int, struct value **, CORE_ADDR,
+ int, CORE_ADDR));
+
+/* BREAKPOINT_FROM_PC uses the program counter value to determine the
+ breakpoint that should be used */
+extern breakpoint_from_pc_fn rs6000_breakpoint_from_pc;
+#define BREAKPOINT_FROM_PC(pcptr, lenptr) rs6000_breakpoint_from_pc (pcptr, lenptr)
+
+/* 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
+
+/* 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 4
+
+
+/* Return the name of register number REG. This may return "" to
+ indicate a register number that's not used on this variant.
+ (Register numbers may be sparse for consistency between variants.) */
+#define REGISTER_NAME(reg) (rs6000_register_name(reg))
+extern char *rs6000_register_name (int reg);
+
+/* Number of machine registers */
+#define NUM_REGS 183
+
+/* Register numbers of various important registers.
+ Note that some of these values are "real" register numbers,
+ and correspond to the general registers of the machine,
+ and some are "phony" register numbers which are too large
+ to be actual register numbers as far as the user is concerned
+ but do serve to get the desired values when passed to read_register. */
+
+#define FP_REGNUM 1 /* Contains address of executing stack frame */
+#define SP_REGNUM 1 /* Contains address of top of stack */
+#define TOC_REGNUM 2 /* TOC register */
+#define FP0_REGNUM 32 /* Floating point register 0 */
+#define GP0_REGNUM 0 /* GPR register 0 */
+#define FP0_REGNUM 32 /* FPR (Floating point) register 0 */
+#define FPLAST_REGNUM 63 /* Last floating point register */
+
+/* Special purpose registers... */
+/* P.S. keep these in the same order as in /usr/mstsave.h `mstsave'
+ structure, for easier processing */
+
+#define PC_REGNUM 64 /* Program counter (instruction address %iar)*/
+#define PS_REGNUM 65 /* Processor (or machine) status (%msr) */
+#define CR_REGNUM 66 /* Condition register */
+#define LR_REGNUM 67 /* Link register */
+#define CTR_REGNUM 68 /* Count register */
+#define XER_REGNUM 69 /* Fixed point exception registers */
+#define MQ_REGNUM 70 /* Multiply/quotient register */
+
+/* These #defines are used to parse core files and talk to ptrace, so they
+ must remain fixed. */
+#define FIRST_UISA_SP_REGNUM 64 /* first special register number */
+#define LAST_UISA_SP_REGNUM 70 /* last special register number */
+
+/* This is the offset in REG_NAMES at which the `set processor'
+ command starts plugging in its names. */
+#define FIRST_VARIANT_REGISTER 66
+
+/* Total amount of space needed to store our copies of the machine's
+ register state, the array `registers'.
+ 32 4-byte gpr's
+ 32 8-byte fpr's
+ 7 4-byte UISA special purpose registers,
+ 16 4-byte segment registers,
+ 32 4-byte standard OEA special-purpose registers,
+ and up to 64 4-byte non-standard OEA special purpose regs.
+ total: (+ (* 32 4) (* 32 8) (* 7 4) (* 16 4) (* 32 4) (* 64 4)) 860 bytes
+ Keep some extra space for now, in case to add more. */
+#define REGISTER_BYTES 880
+
+
+/* Index within `registers' of the first byte of the space for
+ register N. */
+
+#define REGISTER_BYTE(N) \
+ ( \
+ ((N) > FPLAST_REGNUM) ? ((((N) - FPLAST_REGNUM -1) * 4) + 384)\
+ :((N) >= FP0_REGNUM) ? ((((N) - FP0_REGNUM) * 8) + 128) \
+ :((N) * 4) )
+
+/* Number of bytes of storage in the actual machine representation
+ for register N. */
+/* Note that the unsigned cast here forces the result of the
+ subtraction to very high positive values if N < FP0_REGNUM */
+
+#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)
+
+/* Number of bytes of storage in the program's representation
+ for register N. On the RS6000, all regs are 4 bytes
+ except the floating point regs which are 8-byte doubles. */
+
+#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)
+
+/* 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
+
+/* convert a dbx stab register number (from `r' declaration) to a gdb REGNUM */
+
+#define STAB_REG_TO_REGNUM(value) (value)
+
+/* Nonzero if register N requires conversion
+ from raw format to virtual format.
+ The register format for rs6000 floating point registers is always
+ double, we need a conversion if the memory format is float. */
+
+#define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM && (N) <= FPLAST_REGNUM)
+
+/* 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) \
+{ \
+ if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
+ { \
+ double val = extract_floating ((FROM), REGISTER_RAW_SIZE (REGNUM)); \
+ store_floating ((TO), TYPE_LENGTH (TYPE), val); \
+ } \
+ else \
+ memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
+}
+
+/* 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) \
+{ \
+ if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
+ { \
+ double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
+ store_floating ((TO), REGISTER_RAW_SIZE (REGNUM), val); \
+ } \
+ else \
+ memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
+}
+
+/* Return the GDB type object for the "standard" data type
+ of data in register N. */
+
+#define REGISTER_VIRTUAL_TYPE(N) \
+ (((unsigned)(N) - FP0_REGNUM) < 32 ? builtin_type_double : 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. */
+/* in RS6000, struct return addresses are passed as an extra parameter in r3.
+ In function return, callee is not responsible of returning this address back.
+ Since gdb needs to find it, we will store in a designated variable
+ `rs6000_struct_return_address'. */
+
+extern CORE_ADDR rs6000_struct_return_address;
+
+#define STORE_STRUCT_RETURN(ADDR, SP) \
+ { write_register (3, (ADDR)); \
+ rs6000_struct_return_address = (ADDR); }
+
+/* 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) \
+ memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+ extract_return_value(TYPE,REGBUF,VALBUF)
+extern void 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) \
+ { \
+ if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
+ \
+ /* Floating point values are returned starting from FPR1 and up. \
+ Say a double_double_double type could be returned in \
+ FPR1/FPR2/FPR3 triple. */ \
+ \
+ write_register_bytes (REGISTER_BYTE (FP0_REGNUM+1), (VALBUF), \
+ TYPE_LENGTH (TYPE)); \
+ else \
+ /* Everything else is returned in GPR3 and up. */ \
+ write_register_bytes (REGISTER_BYTE (GP0_REGNUM+3), (VALBUF), \
+ TYPE_LENGTH (TYPE)); \
+ }
+
+
+/* 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). */
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) rs6000_struct_return_address
+
+/* 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. */
+
+/* In the case of the RS6000, the frame's nominal address
+ is the address of a 4-byte word containing the calling frame's address. */
+
+#define FRAME_CHAIN(thisframe) rs6000_frame_chain (thisframe)
+CORE_ADDR rs6000_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. */
+
+#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
+ FRAMELESS = frameless_function_invocation (FI)
+
+extern int frameless_function_invocation PARAMS((struct frame_info *));
+
+#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 ());
+#define INIT_FRAME_PC(fromleaf, prev) /* nothing */
+extern void rs6000_init_extra_frame_info (int fromleaf, struct frame_info *);
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) rs6000_init_extra_frame_info (fromleaf, fi)
+
+/* If the kernel has to deliver a signal, it pushes a sigcontext
+ structure on the stack and then calls the signal handler, passing
+ the address of the sigcontext in an argument register. Usually
+ the signal handler doesn't save this register, so we have to
+ access the sigcontext structure via an offset from the signal handler
+ frame.
+ The following constants were determined by experimentation on AIX 3.2. */
+#define SIG_FRAME_PC_OFFSET 96
+#define SIG_FRAME_LR_OFFSET 108
+#define SIG_FRAME_FP_OFFSET 284
+
+/* Default offset from SP where the LR is stored */
+#define DEFAULT_LR_SAVE 8
+
+/* Return saved PC from a frame */
+#define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
+
+extern unsigned long frame_saved_pc PARAMS ((struct frame_info *));
+
+extern CORE_ADDR rs6000_frame_args_address PARAMS ((struct frame_info *));
+#define FRAME_ARGS_ADDRESS(FI) rs6000_frame_args_address (FI)
+
+#define FRAME_LOCALS_ADDRESS(FI) FRAME_ARGS_ADDRESS(FI)
+
+
+/* Set VAL to the number of args passed to frame described by FI.
+ Can set VAL to -1, meaning no way to tell. */
+
+/* We can't tell how many args there are
+ now that the C compiler delays popping them. */
+
+#define FRAME_NUM_ARGS(val,fi) (val = -1)
+
+/* Return number of bytes at start of arglist that are not really args. */
+
+#define FRAME_ARGS_SKIP 8 /* Not sure on this. FIXMEmgo */
+
+/* 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. */
+/* In the following implementation for RS6000, we did *not* save sp. I am
+ not sure if it will be needed. The following macro takes care of gpr's
+ and fpr's only. */
+
+extern void rs6000_frame_init_saved_regs PARAMS ((struct frame_info *));
+#define FRAME_INIT_SAVED_REGS(FI) rs6000_frame_init_saved_regs (FI)
+
+/* Things needed for making the inferior call functions. */
+
+/* Push an empty stack frame, to record the current PC, etc. */
+/* Change these names into rs6k_{push, pop}_frame(). FIXMEmgo. */
+
+#define PUSH_DUMMY_FRAME push_dummy_frame ()
+extern void push_dummy_frame PARAMS ((void));
+
+/* Discard from the stack the innermost frame,
+ restoring all saved registers. */
+
+#define POP_FRAME pop_frame ()
+extern void pop_frame PARAMS ((void));
+
+/* This sequence of words is the instructions:
+
+ mflr r0 // 0x7c0802a6
+ // save fpr's
+ stfd r?, num(r1) // 0xd8010000 there should be 32 of this??
+ // save gpr's
+ stm r0, num(r1) // 0xbc010000
+ stu r1, num(r1) // 0x94210000
+
+ // the function we want to branch might be in a different load
+ // segment. reset the toc register. Note that the actual toc address
+ // will be fix by fix_call_dummy () along with function address.
+
+ st r2, 0x14(r1) // 0x90410014 save toc register
+ liu r2, 0x1234 // 0x3c401234 reset a new toc value 0x12345678
+ oril r2, r2,0x5678 // 0x60425678
+
+ // load absolute address 0x12345678 to r0
+ liu r0, 0x1234 // 0x3c001234
+ oril r0, r0,0x5678 // 0x60005678
+ mtctr r0 // 0x7c0903a6 ctr <- r0
+ bctrl // 0x4e800421 jump subroutine 0x12345678 (%ctr)
+ cror 0xf, 0xf, 0xf // 0x4def7b82
+ brpt // 0x7d821008, breakpoint
+ cror 0xf, 0xf, 0xf // 0x4def7b82 (for 8 byte alignment)
+
+
+ We actually start executing by saving the toc register first, since the pushing
+ of the registers is done by PUSH_DUMMY_FRAME. If this were real code,
+ the arguments for the function called by the `bctrl' would be pushed
+ between the `stu' and the `bctrl', and we could allow it to execute through.
+ But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
+ and we cannot allow to push the registers again.
+*/
+
+#define CALL_DUMMY {0x7c0802a6, 0xd8010000, 0xbc010000, 0x94210000, \
+ 0x90410014, 0x3c401234, 0x60425678, \
+ 0x3c001234, 0x60005678, 0x7c0903a6, 0x4e800421, \
+ 0x4def7b82, 0x7d821008, 0x4def7b82 }
+
+
+/* keep this as multiple of 8 (%sp requires 8 byte alignment) */
+#define CALL_DUMMY_LENGTH 56
+
+#define CALL_DUMMY_START_OFFSET 16
+
+/* Insert the specified number of args and function address into a
+ call sequence of the above form stored at DUMMYNAME. */
+
+#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
+ rs6000_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
+extern void rs6000_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR,
+ int, struct value **,
+ struct type *, int));
+
+/* Hook in rs6000-tdep.c for determining the TOC address when
+ calling functions in the inferior. */
+extern CORE_ADDR (*find_toc_address_hook) PARAMS ((CORE_ADDR));
+
+/* xcoffread.c provides a function to determine the TOC offset
+ for a given object file.
+ It is used under native AIX configurations for determining the
+ TOC address when calling functions in the inferior. */
+#ifdef __STDC__
+struct objfile;
+#endif
+extern CORE_ADDR get_toc_offset PARAMS ((struct objfile *));
+
+/* Usually a function pointer's representation is simply the address
+ of the function. On the RS/6000 however, a function pointer is
+ represented by a pointer to a TOC entry. This TOC entry contains
+ three words, the first word is the address of the function, the
+ second word is the TOC pointer (r2), and the third word is the
+ static chain value. Throughout GDB it is currently assumed that a
+ function pointer contains the address of the function, which is not
+ easy to fix. In addition, the conversion of a function address to
+ a function pointer would require allocation of a TOC entry in the
+ inferior's memory space, with all its drawbacks. To be able to
+ call C++ virtual methods in the inferior (which are called via
+ function pointers), find_function_addr uses this macro to get the
+ function address from a function pointer. */
+
+#define CONVERT_FROM_FUNC_PTR_ADDR(ADDR) \
+ (is_magic_function_pointer (ADDR) ? read_memory_integer (ADDR, 4) : (ADDR))
+extern int is_magic_function_pointer PARAMS ((CORE_ADDR));
+
+/* Flag for machine-specific stuff in shared files. FIXME */
+#define IBM6000_TARGET
+
+/* RS6000/AIX does not support PT_STEP. Has to be simulated. */
+
+#define SOFTWARE_SINGLE_STEP_P 1
+extern void rs6000_software_single_step PARAMS ((unsigned int, int));
+#define SOFTWARE_SINGLE_STEP(sig,bp_p) rs6000_software_single_step (sig, bp_p)
+
+/* 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 PowerPC, 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