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Diffstat (limited to 'gdb/config/rs6000/tm-rs6000.h')
| -rw-r--r-- | gdb/config/rs6000/tm-rs6000.h | 564 |
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 index 0000000..52beec1 --- /dev/null +++ b/gdb/config/rs6000/tm-rs6000.h @@ -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 |