-/* Parameters for target execution on an RS6000, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-extern int symtab_relocated;
-
-/* Minimum possible text address in AIX */
-
-#define TEXT_SEGMENT_BASE 0x10000000
-
-
-/* text addresses in a core file does not necessarily match to symbol table,
- if symbol table relocation wasn't done yet. */
-
-#define CORE_NEEDS_RELOCATION(PC) \
- if (!symtab_relocated && !inferior_pid && (PC) > TEXT_SEGMENT_BASE) \
- (PC) -= ( TEXT_SEGMENT_BASE + text_adjustment (exec_bfd));
-
-/* Load segment of a given pc value. */
-
-#define PC_LOAD_SEGMENT(PC) pc_load_segment_name(PC)
-
-/* AIX cc seems to get this right. */
-
-#define BELIEVE_PCC_PROMOTION 1
-
-/* Conversion between a register number in stab string to actual register num. */
-
-#define STAB_REG_TO_REGNUM(value) (value)
-
-/* return true if a given `pc' value is in `call dummy' function. */
-
-#define PC_IN_CALL_DUMMY(STOP_PC, STOP_SP, STOP_FRAME_ADDR) \
- (STOP_SP < STOP_PC && STOP_PC < STACK_END_ADDR)
-
-/* For each symtab, we keep track of which BFD it came from. */
-#define EXTRA_SYMTAB_INFO \
- unsigned nonreloc:1; /* TRUE if non relocatable */
-
-#define INIT_EXTRA_SYMTAB_INFO(symtab) \
- symtab->nonreloc = 0; \
-
-extern unsigned int text_start, data_start;
-extern int inferior_pid;
-extern char *corefile;
-
-/* 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 {
- 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 function_frame_info. */
-
-struct aix_framedata {
- int offset; /* # of bytes in gpr's and fpr's are saved */
- 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. */
-};
-
-void
-function_frame_info PARAMS ((CORE_ADDR, struct aix_framedata *));
-
-/* Define the byte order of the machine. */
-
-#define TARGET_BYTE_ORDER BIG_ENDIAN
-
-/* Define this if the C compiler puts an underscore at the front
- of external names before giving them to the linker. */
-
-#undef NAMES_HAVE_UNDERSCORE
-
-/* 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) pc = skip_prologue (pc)
-
-/* 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. But we want to do this relocation just
- once. */
-
-extern int loadinfotextindex;
-
-#define SOLIB_CREATE_INFERIOR_HOOK(PID) \
- do { \
- if (loadinfotextindex == 0) \
- xcoff_relocate_symtab (PID); \
- } while (0)
-
-
-/* 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. */
-
-#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; \
- }
-
-/* 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 ()
-
-
-/* When a target process or core-file has been attached, we sneak in
- and figure out where the shared libraries have got to. In case there
- is no inferior_process exists (e.g. bringing up a core file), we can't
- attemtp to relocate symbol table, since we don't have information about
- load segments. */
-
-#define SOLIB_ADD(a, b, c) \
- if (inferior_pid) xcoff_relocate_symtab (inferior_pid)
-
-/* 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 <
-
-#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
-
-/* This is how argumets pushed onto stack or passed in registers. */
-
-#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
- sp = push_arguments(nargs, args, sp, struct_return, struct_addr)
-
-/* Sequence of bytes for breakpoint instruction. */
-
-#define BREAKPOINT {0x7d, 0x82, 0x10, 0x08}
-
-/* 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
-
-/* 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. */
-
-#define REGISTER_TYPE long
-
-/* 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" }
-
-/* 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 */
-
-#define FIRST_SP_REGNUM 64 /* first special register number */
-#define LAST_SP_REGNUM 70 /* last special register number */
-
-/* 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
-
-
-/* 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
- subtractiion 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. */
-
-#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. */
-
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
- bcopy ((FROM), (TO), 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 unsigned int rs6000_struct_return_address;
-
-#define STORE_STRUCT_RETURN(ADDR, SP) \
- { write_register (3, (ADDR)); \
- rs6000_struct_return_address = (unsigned int)(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)) */
-
-#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
- extract_return_value(TYPE,REGBUF,VALBUF)
-
-/* 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
-\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. */
-
-/* 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) \
- (!inside_entry_file ((thisframe)->pc) ? \
- read_memory_integer ((thisframe)->frame, 4) :\
- 0)
-
-/* 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, 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. */
-
-#define EXTRA_FRAME_INFO \
- CORE_ADDR initial_sp; /* initial stack pointer. */ \
- struct frame_saved_regs *cache_fsr; /* saved registers */
-
-/* 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 INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
- fi->initial_sp = 0; \
- fi->cache_fsr = 0;
-
-#define FRAME_SAVED_PC(FRAME) \
- (frameless_function_invocation (FRAME, 1) \
- ? SAVED_PC_AFTER_CALL (FRAME) \
- : read_memory_integer (read_memory_integer ((FRAME)->frame, 4)+8, 4))
-
-#define FRAME_ARGS_ADDRESS(FI) \
- (((struct frame_info*)(FI))->initial_sp ? \
- ((struct frame_info*)(FI))->initial_sp : \
- frame_initial_stack_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. */
-
-#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); \
-}
-
-\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 ()
-
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
-
-#define POP_FRAME pop_frame ()
-
-/* 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, using_gcc) \
- fix_call_dummy(dummyname, pc, fun, nargs, type)
-
-/* 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
projects / deliverable / binutils-gdb.git / blobdiff