/* Parameters for target execution on an RS6000, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1997
+ Free Software Foundation, Inc.
Contributed by IBM Corporation.
This file is part of GDB.
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. */
+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 */
/* 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. */
#endif
extern int inferior_pid;
-/* setpgrp() messes up controling terminal. The other version of it
- requires libbsd.a. */
-#define setpgrp(XX,YY) setpgid (XX, YY)
-
/* We are missing register descriptions in the system header files. Sigh! */
struct regs {
};
-/* To be used by function_frame_info. */
+/* To be used by skip_prologue. */
-struct aix_framedata {
- int offset; /* # of bytes in gpr's and fpr's are saved */
+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 */
};
-void
-function_frame_info PARAMS ((CORE_ADDR, struct aix_framedata *));
-
/* Define the byte order of the machine. */
-#define TARGET_BYTE_ORDER BIG_ENDIAN
+#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++. */
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
-#define SKIP_PROLOGUE(pc) pc = skip_prologue (pc)
+extern CORE_ADDR rs6000_skip_prologue PARAMS ((CORE_ADDR));
+#define SKIP_PROLOGUE(pc) (rs6000_skip_prologue (pc))
+
+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)
-
-/* When a child process is just starting, we sneak in and relocate
- the symbol table (and other stuff) after the dynamic linker has
- figured out where they go. */
-
-#define SOLIB_CREATE_INFERIOR_HOOK(PID) \
- do { \
- xcoff_relocate_symtab (PID); \
- } while (0)
+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 might return a sigtrap, with a "stop after load" status. It should
- be ignored by gdb, shouldn't be mixed up with breakpoint traps. */
-
-/* Another little glitch in AIX is signal 0. I have no idea why wait(2)
- returns with this status word. It looks harmless. */
+/* AIX has a couple of strange returns from wait(). */
-#define SIGTRAP_STOP_AFTER_LOAD(W) \
- if ( (W) == 0x57c || (W) == 0x7f) { \
- if ((W)==0x57c && breakpoints_inserted) { \
- mark_breakpoints_out (); \
- insert_breakpoints (); \
- insert_step_breakpoint (); \
- } \
- resume (0, 0); \
- continue; \
- }
+#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,
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));
-/* When a target process or core-file has been attached, we sneak in
- and figure out where the shared libraries have got to. */
-
-#define SOLIB_ADD(a, b, c) \
- if (inferior_pid) \
- /* Attach to process. */ \
- xcoff_relocate_symtab (inferior_pid); \
- else \
- /* Core file. */ \
- xcoff_relocate_core ();
-extern void xcoff_relocate_core 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
/* Stack grows downward. */
-#define INNER_THAN <
-
-#if 0
-/* No, we shouldn't use this. push_arguments() should leave stack in a
- proper alignment! */
-/* Stack has strict alignment. */
-
-#define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
-#endif
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
-/* This is how argumets pushed onto stack or passed in registers. */
+/* 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)
+ sp = push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))
+extern CORE_ADDR push_arguments PARAMS ((int, struct value **, CORE_ADDR,
+ int, CORE_ADDR));
-/* Sequence of bytes for breakpoint instruction. */
-
-#define BREAKPOINT {0x7d, 0x82, 0x10, 0x08}
+/* 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
#define DECR_PC_AFTER_BREAK 0
-/* Nonzero if instruction at PC is a return instruction. */
-/* Allow any of the return instructions, including a trapv and a return
- from interrupt. */
-
-#define ABOUT_TO_RETURN(pc) \
- ((read_memory_integer (pc, 4) & 0xfe8007ff) == 0x4e800020)
-
-/* Return 1 if P points to an invalid floating point value. */
-
-#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
-
-/* Largest integer type */
-
-#define LONGEST long
-
-/* Name of the builtin type for the LONGEST type above. */
-
-#define BUILTIN_TYPE_LONGEST builtin_type_long
+/* 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
-/* Say how long (ordinary) registers are. */
-#define REGISTER_TYPE long
+/* 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 71
-
-/* Initializer for an array of names of registers.
- There should be NUM_REGS strings in this initializer. */
-
-#define REGISTER_NAMES \
- {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
- "r8", "r9", "r10","r11","r12","r13","r14","r15", \
- "r16","r17","r18","r19","r20","r21","r22","r23", \
- "r24","r25","r26","r27","r28","r29","r30","r31", \
- "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", "ps", "cnd", "lr", "cnt", "xer", "mq" }
+#define NUM_REGS 183
/* Register numbers of various important registers.
Note that some of these values are "real" register numbers,
#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 */
+/* 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 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 XER_REGNUM 69 /* Fixed point exception registers */
#define MQ_REGNUM 70 /* Multiply/quotient register */
-#define FIRST_SP_REGNUM 64 /* first special register number */
-#define LAST_SP_REGNUM 70 /* last special register number */
+/* 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 special purpose registers,
-
- total 416 bytes. Keep some extra space for now, in case to add more. */
-
-#define REGISTER_BYTES 420
+ 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
/* Number of bytes of storage in the actual machine representation
for register N. */
/* Note that the unsigned cast here forces the result of the
- subtractiion to very high positive values if N < FP0_REGNUM */
+ subtraction to very high positive values if N < FP0_REGNUM */
#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)
#define STAB_REG_TO_REGNUM(value) (value)
/* Nonzero if register N requires conversion
- from raw format to virtual format. */
+ 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
- to virtual format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
- bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM))
-
-/* Convert data from virtual format for register REGNUM
- to raw format for register 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)); \
+}
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
- bcopy ((FROM), (TO), 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. */
Since gdb needs to find it, we will store in a designated variable
`rs6000_struct_return_address'. */
-extern unsigned int 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 = (unsigned int)(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) \
- bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)) */
+ 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. */
is the address of a 4-byte word containing the calling frame's address. */
#define FRAME_CHAIN(thisframe) rs6000_frame_chain (thisframe)
-#ifdef __STDC__
-struct frame_info;
-#endif
CORE_ADDR rs6000_frame_chain PARAMS ((struct frame_info *));
/* Define other aspects of the stack frame. */
does not, FRAMELESS is set to 1, else 0. */
#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
- FRAMELESS = frameless_function_invocation (FI, 0)
-
-/* Functions calling alloca() change the value of the stack pointer. We
- need to use initial stack pointer (which is saved in r31 by gcc) in
- such cases. If a compiler emits traceback table, then we should use the
- alloca register specified in traceback table. FIXME. */
-/* Also, it is a good idea to cache information about frame's saved registers
- in the frame structure to speed things up. See tm-m88k.h. FIXME. */
+ FRAMELESS = frameless_function_invocation (FI)
-#define EXTRA_FRAME_INFO \
- CORE_ADDR initial_sp; /* initial stack pointer. */ \
- struct frame_saved_regs *cache_fsr; /* saved registers */
+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 */
-#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
- fi->initial_sp = 0; \
- fi->cache_fsr = 0; \
- if (fi->next != (CORE_ADDR)0 \
- && read_memory_integer (fi->frame, 4) == 0 \
- && fi->pc < TEXT_SEGMENT_BASE) \
- /* We're in get_prev_frame_info */ \
- /* and this is a special signal frame. */ \
- /* (fi->pc will be something like 0x3f88 or 0x2790). */ \
- fi->signal_handler_caller = 1;
-
-/* Frameless function invocation in IBM RS/6000 is sometimes
- half-done. It perfectly sets up a new frame, e.g. a new frame (in
- fact stack) pointer, etc, but it doesn't save the %pc. We call
- frameless_function_invocation to tell us how to get the %pc. */
-
-#define FRAME_SAVED_PC(FRAME) \
- (frameless_function_invocation (FRAME, 1) \
- ? SAVED_PC_AFTER_CALL (FRAME) \
- : read_memory_integer (rs6000_frame_chain (FRAME)+8, 4))
-
-#define FRAME_ARGS_ADDRESS(FI) \
- (((struct frame_info*)(FI))->initial_sp ? \
- ((struct frame_info*)(FI))->initial_sp : \
- frame_initial_stack_address (FI))
+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)
not sure if it will be needed. The following macro takes care of gpr's
and fpr's only. */
-#define FRAME_FIND_SAVED_REGS(FRAME_INFO, FRAME_SAVED_REGS) \
-{ \
- int ii; \
- CORE_ADDR frame_addr, func_start; \
- struct aix_framedata fdata; \
- \
- /* find the start of the function and collect info about its frame. */\
- \
- func_start = get_pc_function_start ((FRAME_INFO)->pc) + FUNCTION_START_OFFSET; \
- function_frame_info (func_start, &fdata); \
- bzero (&(FRAME_SAVED_REGS), sizeof (FRAME_SAVED_REGS)); \
- \
- /* if there were any saved registers, figure out parent's stack pointer. */ \
- frame_addr = 0; \
- /* the following is true only if the frame doesn't have a call to alloca(), \
- FIXME. */ \
- if (fdata.saved_fpr >= 0 || fdata.saved_gpr >= 0) { \
- if ((FRAME_INFO)->prev && (FRAME_INFO)->prev->frame) \
- frame_addr = (FRAME_INFO)->prev->frame; \
- else \
- frame_addr = read_memory_integer ((FRAME_INFO)->frame, 4); \
- } \
- \
- /* if != -1, fdata.saved_fpr is the smallest number of saved_fpr. All fpr's \
- from saved_fpr to fp31 are saved right underneath caller stack pointer, \
- starting from fp31 first. */ \
- \
- if (fdata.saved_fpr >= 0) { \
- for (ii=31; ii >= fdata.saved_fpr; --ii) \
- (FRAME_SAVED_REGS).regs [FP0_REGNUM + ii] = frame_addr - ((32 - ii) * 8); \
- frame_addr -= (32 - fdata.saved_fpr) * 8; \
- } \
- \
- /* if != -1, fdata.saved_gpr is the smallest number of saved_gpr. All gpr's \
- from saved_gpr to gpr31 are saved right under saved fprs, starting \
- from r31 first. */ \
- \
- if (fdata.saved_gpr >= 0) \
- for (ii=31; ii >= fdata.saved_gpr; --ii) \
- (FRAME_SAVED_REGS).regs [ii] = frame_addr - ((32 - ii) * 4); \
-}
+extern void rs6000_frame_init_saved_regs PARAMS ((struct frame_info *));
+#define FRAME_INIT_SAVED_REGS(FI) rs6000_frame_init_saved_regs (FI)
-\f
/* 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:
#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. */
+/* 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, using_gcc) \
- fix_call_dummy(dummyname, pc, fun, nargs, type)
+#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 NO_SINGLE_STEP
+#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