566 lines
21 KiB
C
566 lines
21 KiB
C
/* Parameters for target execution on an RS6000, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1997
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Free Software Foundation, Inc.
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Contributed by IBM Corporation.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifdef __STDC__ /* Forward decls for prototypes */
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struct frame_info;
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struct type;
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struct value;
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#endif
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/* Minimum possible text address in AIX */
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#define TEXT_SEGMENT_BASE 0x10000000
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/* Load segment of a given pc value. */
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#define PC_LOAD_SEGMENT(PC) pc_load_segment_name(PC)
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extern char *pc_load_segment_name PARAMS ((CORE_ADDR));
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/* AIX cc seems to get this right. */
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#define BELIEVE_PCC_PROMOTION 1
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/* return true if a given `pc' value is in `call dummy' function. */
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/* FIXME: This just checks for the end of the stack, which is broken
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for things like stepping through gcc nested function stubs. */
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#define PC_IN_CALL_DUMMY(STOP_PC, STOP_SP, STOP_FRAME_ADDR) \
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(STOP_SP < STOP_PC && STOP_PC < STACK_END_ADDR)
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#if 0
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extern unsigned int text_start, data_start;
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extern char *corefile;
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#endif
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extern int inferior_pid;
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/* We are missing register descriptions in the system header files. Sigh! */
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struct regs
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{
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int gregs[32]; /* general purpose registers */
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int pc; /* program conter */
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int ps; /* processor status, or machine state */
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};
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struct fp_status
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{
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double fpregs[32]; /* floating GP registers */
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};
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/* To be used by skip_prologue. */
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struct rs6000_framedata
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{
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int offset; /* total size of frame --- the distance
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by which we decrement sp to allocate
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the frame */
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int saved_gpr; /* smallest # of saved gpr */
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int saved_fpr; /* smallest # of saved fpr */
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int alloca_reg; /* alloca register number (frame ptr) */
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char frameless; /* true if frameless functions. */
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char nosavedpc; /* true if pc not saved. */
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int gpr_offset; /* offset of saved gprs from prev sp */
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int fpr_offset; /* offset of saved fprs from prev sp */
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int lr_offset; /* offset of saved lr */
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int cr_offset; /* offset of saved cr */
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};
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/* Define the byte order of the machine. */
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#define TARGET_BYTE_ORDER_DEFAULT BIG_ENDIAN
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/* AIX's assembler doesn't grok dollar signs in identifiers.
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So we use dots instead. This item must be coordinated with G++. */
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#undef CPLUS_MARKER
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#define CPLUS_MARKER '.'
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/* Offset from address of function to start of its code.
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Zero on most machines. */
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#define FUNCTION_START_OFFSET 0
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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extern CORE_ADDR rs6000_skip_prologue PARAMS ((CORE_ADDR));
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#define SKIP_PROLOGUE(pc) (rs6000_skip_prologue (pc))
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extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, struct rs6000_framedata *));
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/* If PC is in some function-call trampoline code, return the PC
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where the function itself actually starts. If not, return NULL. */
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#define SKIP_TRAMPOLINE_CODE(pc) skip_trampoline_code (pc)
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extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR));
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/* Number of trap signals we need to skip over, once the inferior process
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starts running. */
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#define START_INFERIOR_TRAPS_EXPECTED 2
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/* AIX has a couple of strange returns from wait(). */
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#define CHILD_SPECIAL_WAITSTATUS(ourstatus, hoststatus) ( \
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/* "stop after load" status. */ \
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(hoststatus) == 0x57c ? (ourstatus)->kind = TARGET_WAITKIND_LOADED, 1 : \
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\
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/* signal 0. I have no idea why wait(2) returns with this status word. */ \
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/* It looks harmless. */ \
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(hoststatus) == 0x7f ? (ourstatus)->kind = TARGET_WAITKIND_SPURIOUS, 1 : \
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\
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/* A normal waitstatus. Let the usual macros deal with it. */ \
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0)
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/* In xcoff, we cannot process line numbers when we see them. This is
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mainly because we don't know the boundaries of the include files. So,
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we postpone that, and then enter and sort(?) the whole line table at
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once, when we are closing the current symbol table in end_symtab(). */
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#define PROCESS_LINENUMBER_HOOK() aix_process_linenos ()
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extern void aix_process_linenos PARAMS ((void));
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/* Immediately after a function call, return the saved pc.
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Can't go through the frames for this because on some machines
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the new frame is not set up until the new function executes
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some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) read_register (LR_REGNUM)
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/* Address of end of stack space. */
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#define STACK_END_ADDR 0x2ff80000
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/* Stack grows downward. */
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#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
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/* This is how arguments pushed onto stack or passed in registers.
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Stack must be aligned on 64-bit boundaries when synthesizing
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function calls. We don't need STACK_ALIGN, PUSH_ARGUMENTS will
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handle it. */
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#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
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(rs6000_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
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extern CORE_ADDR rs6000_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));
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/* BREAKPOINT_FROM_PC uses the program counter value to determine the
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breakpoint that should be used */
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extern breakpoint_from_pc_fn rs6000_breakpoint_from_pc;
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#define BREAKPOINT_FROM_PC(pcptr, lenptr) rs6000_breakpoint_from_pc (pcptr, lenptr)
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/* Amount PC must be decremented by after a breakpoint.
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This is often the number of bytes in BREAKPOINT
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but not always. */
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#define DECR_PC_AFTER_BREAK 0
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/* Say how long (ordinary) registers are. This is a piece of bogosity
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used in push_word and a few other places; REGISTER_RAW_SIZE is the
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real way to know how big a register is. */
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#define REGISTER_SIZE 4
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/* Return the name of register number REG. This may return "" to
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indicate a register number that's not used on this variant.
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(Register numbers may be sparse for consistency between variants.) */
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#define REGISTER_NAME(reg) (rs6000_register_name(reg))
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extern char *rs6000_register_name (int reg);
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/* Number of machine registers */
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#define NUM_REGS 183
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/* Register numbers of various important registers.
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Note that some of these values are "real" register numbers,
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and correspond to the general registers of the machine,
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and some are "phony" register numbers which are too large
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to be actual register numbers as far as the user is concerned
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but do serve to get the desired values when passed to read_register. */
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#define FP_REGNUM 1 /* Contains address of executing stack frame */
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#define SP_REGNUM 1 /* Contains address of top of stack */
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#define TOC_REGNUM 2 /* TOC register */
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#define FP0_REGNUM 32 /* Floating point register 0 */
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#define GP0_REGNUM 0 /* GPR register 0 */
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#define FP0_REGNUM 32 /* FPR (Floating point) register 0 */
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#define FPLAST_REGNUM 63 /* Last floating point register */
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/* Special purpose registers... */
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/* P.S. keep these in the same order as in /usr/mstsave.h `mstsave'
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structure, for easier processing */
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#define PC_REGNUM 64 /* Program counter (instruction address %iar) */
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#define PS_REGNUM 65 /* Processor (or machine) status (%msr) */
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#define CR_REGNUM 66 /* Condition register */
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#define LR_REGNUM 67 /* Link register */
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#define CTR_REGNUM 68 /* Count register */
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#define XER_REGNUM 69 /* Fixed point exception registers */
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#define MQ_REGNUM 70 /* Multiply/quotient register */
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/* These #defines are used to parse core files and talk to ptrace, so they
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must remain fixed. */
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#define FIRST_UISA_SP_REGNUM 64 /* first special register number */
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#define LAST_UISA_SP_REGNUM 70 /* last special register number */
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/* This is the offset in REG_NAMES at which the `set processor'
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command starts plugging in its names. */
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#define FIRST_VARIANT_REGISTER 66
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/* Total amount of space needed to store our copies of the machine's
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register state, the array `registers'.
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32 4-byte gpr's
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32 8-byte fpr's
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7 4-byte UISA special purpose registers,
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16 4-byte segment registers,
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32 4-byte standard OEA special-purpose registers,
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and up to 64 4-byte non-standard OEA special purpose regs.
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total: (+ (* 32 4) (* 32 8) (* 7 4) (* 16 4) (* 32 4) (* 64 4)) 860 bytes
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Keep some extra space for now, in case to add more. */
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#define REGISTER_BYTES 880
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) \
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( \
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((N) > FPLAST_REGNUM) ? ((((N) - FPLAST_REGNUM -1) * 4) + 384)\
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:((N) >= FP0_REGNUM) ? ((((N) - FP0_REGNUM) * 8) + 128) \
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:((N) * 4) )
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/* Number of bytes of storage in the actual machine representation
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for register N. */
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/* Note that the unsigned cast here forces the result of the
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subtraction to very high positive values if N < FP0_REGNUM */
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#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)
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/* Number of bytes of storage in the program's representation
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for register N. On the RS6000, all regs are 4 bytes
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except the floating point regs which are 8-byte doubles. */
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#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 8
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 8
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/* convert a dbx stab register number (from `r' declaration) to a gdb REGNUM */
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#define STAB_REG_TO_REGNUM(value) (value)
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/* Nonzero if register N requires conversion
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from raw format to virtual format.
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The register format for rs6000 floating point registers is always
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double, we need a conversion if the memory format is float. */
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#define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM && (N) <= FPLAST_REGNUM)
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/* Convert data from raw format for register REGNUM in buffer FROM
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to virtual format with type TYPE in buffer TO. */
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
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{ \
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if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
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{ \
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double val = extract_floating ((FROM), REGISTER_RAW_SIZE (REGNUM)); \
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store_floating ((TO), TYPE_LENGTH (TYPE), val); \
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} \
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else \
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memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
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}
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/* Convert data from virtual format with type TYPE in buffer FROM
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to raw format for register REGNUM in buffer TO. */
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#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
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{ \
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if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
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{ \
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double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
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store_floating ((TO), REGISTER_RAW_SIZE (REGNUM), val); \
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} \
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else \
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memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
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}
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#define REGISTER_VIRTUAL_TYPE(N) \
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(((unsigned)(N) - FP0_REGNUM) < 32 ? builtin_type_double : builtin_type_int)
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/* Store the address of the place in which to copy the structure the
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subroutine will return. This is called from call_function. */
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/* in RS6000, struct return addresses are passed as an extra parameter in r3.
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In function return, callee is not responsible of returning this address back.
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Since gdb needs to find it, we will store in a designated variable
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`rs6000_struct_return_address'. */
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extern CORE_ADDR rs6000_struct_return_address;
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#define STORE_STRUCT_RETURN(ADDR, SP) \
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{ write_register (3, (ADDR)); \
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rs6000_struct_return_address = (ADDR); }
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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/* #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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extract_return_value(TYPE,REGBUF,VALBUF)
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extern void extract_return_value PARAMS ((struct type *, char[], char *));
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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{ \
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if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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\
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/* Floating point values are returned starting from FPR1 and up. \
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Say a double_double_double type could be returned in \
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FPR1/FPR2/FPR3 triple. */ \
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\
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write_register_bytes (REGISTER_BYTE (FP0_REGNUM+1), (VALBUF), \
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TYPE_LENGTH (TYPE)); \
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else \
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/* Everything else is returned in GPR3 and up. */ \
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write_register_bytes (REGISTER_BYTE (GP0_REGNUM+3), (VALBUF), \
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TYPE_LENGTH (TYPE)); \
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}
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/* Extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR (or an expression that can be used as one). */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) rs6000_struct_return_address
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/* Describe the pointer in each stack frame to the previous stack frame
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer. */
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/* In the case of the RS6000, the frame's nominal address
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is the address of a 4-byte word containing the calling frame's address. */
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#define FRAME_CHAIN(thisframe) rs6000_frame_chain (thisframe)
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CORE_ADDR rs6000_frame_chain PARAMS ((struct frame_info *));
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/* Define other aspects of the stack frame. */
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI) \
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(frameless_function_invocation (FI))
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extern int frameless_function_invocation PARAMS ((struct frame_info *));
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#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
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prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) : \
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prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
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#define INIT_FRAME_PC(fromleaf, prev) /* nothing */
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extern void rs6000_init_extra_frame_info (int fromleaf, struct frame_info *);
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) rs6000_init_extra_frame_info (fromleaf, fi)
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/* If the kernel has to deliver a signal, it pushes a sigcontext
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structure on the stack and then calls the signal handler, passing
|
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the address of the sigcontext in an argument register. Usually
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the signal handler doesn't save this register, so we have to
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access the sigcontext structure via an offset from the signal handler
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frame.
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The following constants were determined by experimentation on AIX 3.2. */
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#define SIG_FRAME_PC_OFFSET 96
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#define SIG_FRAME_LR_OFFSET 108
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#define SIG_FRAME_FP_OFFSET 284
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/* Default offset from SP where the LR is stored */
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#define DEFAULT_LR_SAVE 8
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/* Return saved PC from a frame */
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#define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
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extern unsigned long frame_saved_pc PARAMS ((struct frame_info *));
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extern CORE_ADDR rs6000_frame_args_address PARAMS ((struct frame_info *));
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#define FRAME_ARGS_ADDRESS(FI) rs6000_frame_args_address (FI)
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#define FRAME_LOCALS_ADDRESS(FI) FRAME_ARGS_ADDRESS(FI)
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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can't tell how many args there are
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now that the C compiler delays popping them. */
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#define FRAME_NUM_ARGS(fi) (-1)
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 8 /* Not sure on this. FIXMEmgo */
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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/* In the following implementation for RS6000, we did *not* save sp. I am
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not sure if it will be needed. The following macro takes care of gpr's
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and fpr's only. */
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extern void rs6000_frame_init_saved_regs PARAMS ((struct frame_info *));
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#define FRAME_INIT_SAVED_REGS(FI) rs6000_frame_init_saved_regs (FI)
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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/* Change these names into rs6k_{push, pop}_frame(). FIXMEmgo. */
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#define PUSH_DUMMY_FRAME push_dummy_frame ()
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extern void push_dummy_frame PARAMS ((void));
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/* Discard from the stack the innermost frame,
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restoring all saved registers. */
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|
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#define POP_FRAME pop_frame ()
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||
extern void pop_frame PARAMS ((void));
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|
||
/* This sequence of words is the instructions:
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|
||
mflr r0 // 0x7c0802a6
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// save fpr's
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stfd r?, num(r1) // 0xd8010000 there should be 32 of this??
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// save gpr's
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stm r0, num(r1) // 0xbc010000
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stu r1, num(r1) // 0x94210000
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// 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
|