| /* Parameters for execution on any Hewlett-Packard PA-RISC machine. |
| Copyright 1986, 1987, 1989-1993, 1995, 1999, 2000 Free Software Foundation, Inc. |
| |
| Contributed by the Center for Software Science at the |
| University of Utah (pa-gdb-bugs@cs.utah.edu). |
| |
| 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. */ |
| |
| /* Forward declarations of some types we use in prototypes */ |
| |
| struct frame_info; |
| struct frame_saved_regs; |
| struct value; |
| struct type; |
| struct inferior_status; |
| |
| /* Target system byte order. */ |
| |
| #define TARGET_BYTE_ORDER BIG_ENDIAN |
| |
| /* By default assume we don't have to worry about software floating point. */ |
| #ifndef SOFT_FLOAT |
| #define SOFT_FLOAT 0 |
| #endif |
| |
| /* Get at various relevent fields of an instruction word. */ |
| |
| #define MASK_5 0x1f |
| #define MASK_11 0x7ff |
| #define MASK_14 0x3fff |
| #define MASK_21 0x1fffff |
| |
| /* This macro gets bit fields using HP's numbering (MSB = 0) */ |
| #ifndef GET_FIELD |
| #define GET_FIELD(X, FROM, TO) \ |
| ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1)) |
| #endif |
| |
| /* Watch out for NaNs */ |
| |
| #define IEEE_FLOAT (1) |
| |
| /* On the PA, any pass-by-value structure > 8 bytes is actually |
| passed via a pointer regardless of its type or the compiler |
| used. */ |
| |
| #define REG_STRUCT_HAS_ADDR(gcc_p,type) \ |
| (TYPE_LENGTH (type) > 8) |
| |
| /* 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. */ |
| |
| extern CORE_ADDR hppa_skip_prologue PARAMS ((CORE_ADDR)); |
| #define SKIP_PROLOGUE(pc) (hppa_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, NULL) |
| extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *)); |
| |
| /* Return non-zero if we are in an appropriate trampoline. */ |
| |
| #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \ |
| in_solib_call_trampoline (pc, name) |
| extern int in_solib_call_trampoline PARAMS ((CORE_ADDR, char *)); |
| |
| #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \ |
| in_solib_return_trampoline (pc, name) |
| extern int in_solib_return_trampoline PARAMS ((CORE_ADDR, char *)); |
| |
| /* 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. */ |
| |
| #undef SAVED_PC_AFTER_CALL |
| #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call (frame) |
| extern CORE_ADDR saved_pc_after_call PARAMS ((struct frame_info *)); |
| |
| /* Stack grows upward */ |
| #define INNER_THAN(lhs,rhs) ((lhs) > (rhs)) |
| |
| /* elz: adjust the quantity to the next highest value which is 64-bit aligned. |
| This is used in valops.c, when the sp is adjusted. |
| On hppa the sp must always be kept 64-bit aligned */ |
| |
| #define STACK_ALIGN(arg) ( ((arg)%8) ? (((arg)+7)&-8) : (arg)) |
| #define NO_EXTRA_ALIGNMENT_NEEDED 1 |
| |
| /* Sequence of bytes for breakpoint instruction. */ |
| |
| #define BREAKPOINT {0x00, 0x01, 0x00, 0x04} |
| #define BREAKPOINT32 0x10004 |
| |
| /* Amount PC must be decremented by after a breakpoint. |
| This is often the number of bytes in BREAKPOINT |
| but not always. |
| |
| Not on the PA-RISC */ |
| |
| #define DECR_PC_AFTER_BREAK 0 |
| |
| /* Sometimes we may pluck out a minimal symbol that has a negative |
| address. |
| |
| An example of this occurs when an a.out is linked against a foo.sl. |
| The foo.sl defines a global bar(), and the a.out declares a signature |
| for bar(). However, the a.out doesn't directly call bar(), but passes |
| its address in another call. |
| |
| If you have this scenario and attempt to "break bar" before running, |
| gdb will find a minimal symbol for bar() in the a.out. But that |
| symbol's address will be negative. What this appears to denote is |
| an index backwards from the base of the procedure linkage table (PLT) |
| into the data linkage table (DLT), the end of which is contiguous |
| with the start of the PLT. This is clearly not a valid address for |
| us to set a breakpoint on. |
| |
| Note that one must be careful in how one checks for a negative address. |
| 0xc0000000 is a legitimate address of something in a shared text |
| segment, for example. Since I don't know what the possible range |
| is of these "really, truly negative" addresses that come from the |
| minimal symbols, I'm resorting to the gross hack of checking the |
| top byte of the address for all 1's. Sigh. |
| */ |
| #define PC_REQUIRES_RUN_BEFORE_USE(pc) \ |
| (! target_has_stack && (pc & 0xFF000000)) |
| |
| /* return instruction is bv r0(rp) or bv,n r0(rp) */ |
| |
| #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 4) | 0x2) == 0xE840C002) |
| |
| /* 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 |
| |
| /* Number of machine registers */ |
| |
| #define NUM_REGS 128 |
| |
| /* Initializer for an array of names of registers. |
| There should be NUM_REGS strings in this initializer. |
| They are in rows of eight entries */ |
| |
| #define REGISTER_NAMES \ |
| {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", \ |
| "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ |
| "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ |
| "r24", "r25", "r26", "dp", "ret0", "ret1", "sp", "r31", \ |
| "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", "eiem", "iir", "isr", \ |
| "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", "sr3", \ |
| "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", \ |
| "cr13", "cr24", "cr25", "cr26", "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",\ |
| "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \ |
| "fr4", "fr4R", "fr5", "fr5R", "fr6", "fr6R", "fr7", "fr7R", \ |
| "fr8", "fr8R", "fr9", "fr9R", "fr10", "fr10R", "fr11", "fr11R", \ |
| "fr12", "fr12R", "fr13", "fr13R", "fr14", "fr14R", "fr15", "fr15R", \ |
| "fr16", "fr16R", "fr17", "fr17R", "fr18", "fr18R", "fr19", "fr19R", \ |
| "fr20", "fr20R", "fr21", "fr21R", "fr22", "fr22R", "fr23", "fr23R", \ |
| "fr24", "fr24R", "fr25", "fr25R", "fr26", "fr26R", "fr27", "fr27R", \ |
| "fr28", "fr28R", "fr29", "fr29R", "fr30", "fr30R", "fr31", "fr31R"} |
| |
| /* 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 R0_REGNUM 0 /* Doesn't actually exist, used as base for |
| other r registers. */ |
| #define FLAGS_REGNUM 0 /* Various status flags */ |
| #define RP_REGNUM 2 /* return pointer */ |
| #define FP_REGNUM 3 /* Contains address of executing stack */ |
| /* frame */ |
| #define SP_REGNUM 30 /* Contains address of top of stack */ |
| #define SAR_REGNUM 32 /* Shift Amount Register */ |
| #define IPSW_REGNUM 41 /* Interrupt Processor Status Word */ |
| #define PCOQ_HEAD_REGNUM 33 /* instruction offset queue head */ |
| #define PCSQ_HEAD_REGNUM 34 /* instruction space queue head */ |
| #define PCOQ_TAIL_REGNUM 35 /* instruction offset queue tail */ |
| #define PCSQ_TAIL_REGNUM 36 /* instruction space queue tail */ |
| #define EIEM_REGNUM 37 /* External Interrupt Enable Mask */ |
| #define IIR_REGNUM 38 /* Interrupt Instruction Register */ |
| #define IOR_REGNUM 40 /* Interrupt Offset Register */ |
| #define SR4_REGNUM 43 /* space register 4 */ |
| #define RCR_REGNUM 51 /* Recover Counter (also known as cr0) */ |
| #define CCR_REGNUM 54 /* Coprocessor Configuration Register */ |
| #define TR0_REGNUM 57 /* Temporary Registers (cr24 -> cr31) */ |
| #define CR27_REGNUM 60 /* Base register for thread-local storage, cr27 */ |
| #define FP0_REGNUM 64 /* floating point reg. 0 (fspr) */ |
| #define FP4_REGNUM 72 |
| |
| #define ARG0_REGNUM 26 /* The first argument of a callee. */ |
| #define ARG1_REGNUM 25 /* The second argument of a callee. */ |
| #define ARG2_REGNUM 24 /* The third argument of a callee. */ |
| #define ARG3_REGNUM 23 /* The fourth argument of a callee. */ |
| |
| /* compatibility with the rest of gdb. */ |
| #define PC_REGNUM PCOQ_HEAD_REGNUM |
| #define NPC_REGNUM PCOQ_TAIL_REGNUM |
| |
| /* |
| * Processor Status Word Masks |
| */ |
| |
| #define PSW_T 0x01000000 /* Taken Branch Trap Enable */ |
| #define PSW_H 0x00800000 /* Higher-Privilege Transfer Trap Enable */ |
| #define PSW_L 0x00400000 /* Lower-Privilege Transfer Trap Enable */ |
| #define PSW_N 0x00200000 /* PC Queue Front Instruction Nullified */ |
| #define PSW_X 0x00100000 /* Data Memory Break Disable */ |
| #define PSW_B 0x00080000 /* Taken Branch in Previous Cycle */ |
| #define PSW_C 0x00040000 /* Code Address Translation Enable */ |
| #define PSW_V 0x00020000 /* Divide Step Correction */ |
| #define PSW_M 0x00010000 /* High-Priority Machine Check Disable */ |
| #define PSW_CB 0x0000ff00 /* Carry/Borrow Bits */ |
| #define PSW_R 0x00000010 /* Recovery Counter Enable */ |
| #define PSW_Q 0x00000008 /* Interruption State Collection Enable */ |
| #define PSW_P 0x00000004 /* Protection ID Validation Enable */ |
| #define PSW_D 0x00000002 /* Data Address Translation Enable */ |
| #define PSW_I 0x00000001 /* External, Power Failure, Low-Priority */ |
| /* Machine Check Interruption Enable */ |
| |
| /* When fetching register values from an inferior or a core file, |
| clean them up using this macro. BUF is a char pointer to |
| the raw value of the register in the registers[] array. */ |
| |
| #define CLEAN_UP_REGISTER_VALUE(regno, buf) \ |
| do { \ |
| if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \ |
| (buf)[sizeof(CORE_ADDR) -1] &= ~0x3; \ |
| } while (0) |
| |
| /* Define DO_REGISTERS_INFO() to do machine-specific formatting |
| of register dumps. */ |
| |
| #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp) |
| extern void pa_do_registers_info PARAMS ((int, int)); |
| |
| #if 0 |
| #define STRCAT_REGISTER(regnum, fpregs, stream, precision) pa_do_strcat_registers_info (regnum, fpregs, stream, precision) |
| extern void pa_do_strcat_registers_info (int, int, struct ui_file *, enum precision_type); |
| #endif |
| |
| /* PA specific macro to see if the current instruction is nullified. */ |
| #ifndef INSTRUCTION_NULLIFIED |
| #define INSTRUCTION_NULLIFIED \ |
| (((int)read_register (IPSW_REGNUM) & 0x00200000) && \ |
| !((int)read_register (FLAGS_REGNUM) & 0x2)) |
| #endif |
| |
| /* Number of bytes of storage in the actual machine representation |
| for register N. On the PA-RISC, all regs are 4 bytes, including |
| the FP registers (they're accessed as two 4 byte halves). */ |
| |
| #define REGISTER_RAW_SIZE(N) 4 |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register state, the array `registers'. */ |
| #define REGISTER_BYTES (NUM_REGS * 4) |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| |
| #define REGISTER_BYTE(N) (N) * 4 |
| |
| /* Number of bytes of storage in the program's representation |
| for register N. */ |
| |
| #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N) |
| |
| /* Largest value REGISTER_RAW_SIZE can have. */ |
| |
| #define MAX_REGISTER_RAW_SIZE 4 |
| |
| /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| |
| #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| |
| /* Return the GDB type object for the "standard" data type |
| of data in register N. */ |
| |
| #define REGISTER_VIRTUAL_TYPE(N) \ |
| ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_float) |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. This is called from call_function. */ |
| |
| #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (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. |
| |
| elz: changed what to return when length is > 4: the stored result is |
| in register 28 and in register 29, with the lower order word being in reg 29, |
| so we must start reading it from somehere in the middle of reg28 |
| |
| FIXME: Not sure what to do for soft float here. */ |
| |
| #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| { \ |
| if (TYPE_CODE (TYPE) == TYPE_CODE_FLT && !SOFT_FLOAT) \ |
| memcpy ((VALBUF), \ |
| ((char *)(REGBUF)) + REGISTER_BYTE (FP4_REGNUM), \ |
| TYPE_LENGTH (TYPE)); \ |
| else \ |
| memcpy ((VALBUF), \ |
| (char *)(REGBUF) + REGISTER_BYTE (28) + \ |
| (TYPE_LENGTH (TYPE) > 4 ? (8 - TYPE_LENGTH (TYPE)) : (4 - TYPE_LENGTH (TYPE))), \ |
| TYPE_LENGTH (TYPE)); \ |
| } |
| |
| |
| /* elz: decide whether the function returning a value of type type |
| will put it on the stack or in the registers. |
| The pa calling convention says that: |
| register 28 (called ret0 by gdb) contains any ASCII char, |
| and any non_floating point value up to 32-bits. |
| reg 28 and 29 contain non-floating point up tp 64 bits and larger |
| than 32 bits. (higer order word in reg 28). |
| fr4: floating point up to 64 bits |
| sr1: space identifier (32-bit) |
| stack: any lager than 64-bit, with the address in r28 |
| */ |
| extern use_struct_convention_fn hppa_use_struct_convention; |
| #define USE_STRUCT_CONVENTION(gcc_p,type) hppa_use_struct_convention (gcc_p,type) |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. |
| |
| For software floating point the return value goes into the integer |
| registers. But we don't have any flag to key this on, so we always |
| store the value into the integer registers, and if it's a float value, |
| then we put it in the float registers too. */ |
| |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| write_register_bytes (REGISTER_BYTE (28),(VALBUF), TYPE_LENGTH (TYPE)) ; \ |
| if (!SOFT_FLOAT) \ |
| write_register_bytes ((TYPE_CODE(TYPE) == TYPE_CODE_FLT \ |
| ? REGISTER_BYTE (FP4_REGNUM) \ |
| : REGISTER_BYTE (28)), \ |
| (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) \ |
| (*(int *)((REGBUF) + REGISTER_BYTE (28))) |
| |
| /* elz: Return a large value, which is stored on the stack at addr. |
| This is defined only for the hppa, at this moment. |
| The above macro EXTRACT_STRUCT_VALUE_ADDRESS is not called anymore, |
| because it assumes that on exit from a called function which returns |
| a large structure on the stack, the address of the ret structure is |
| still in register 28. Unfortunately this register is usually overwritten |
| by the called function itself, on hppa. This is specified in the calling |
| convention doc. As far as I know, the only way to get the return value |
| is to have the caller tell us where it told the callee to put it, rather |
| than have the callee tell us. |
| */ |
| #define VALUE_RETURNED_FROM_STACK(valtype,addr) \ |
| hppa_value_returned_from_stack (valtype, addr) |
| |
| /* |
| * This macro defines the register numbers (from REGISTER_NAMES) that |
| * are effectively unavailable to the user through ptrace(). It allows |
| * us to include the whole register set in REGISTER_NAMES (inorder to |
| * better support remote debugging). If it is used in |
| * fetch/store_inferior_registers() gdb will not complain about I/O errors |
| * on fetching these registers. If all registers in REGISTER_NAMES |
| * are available, then return false (0). |
| */ |
| |
| #define CANNOT_STORE_REGISTER(regno) \ |
| ((regno) == 0) || \ |
| ((regno) == PCSQ_HEAD_REGNUM) || \ |
| ((regno) >= PCSQ_TAIL_REGNUM && (regno) < IPSW_REGNUM) || \ |
| ((regno) > IPSW_REGNUM && (regno) < FP4_REGNUM) |
| |
| #define INIT_EXTRA_FRAME_INFO(fromleaf, frame) init_extra_frame_info (fromleaf, frame) |
| extern void init_extra_frame_info PARAMS ((int, struct frame_info *)); |
| |
| /* 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. |
| |
| FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address |
| and produces the nominal address of the caller frame. |
| |
| However, if FRAME_CHAIN_VALID returns zero, |
| it means the given frame is the outermost one and has no caller. |
| In that case, FRAME_CHAIN_COMBINE is not used. */ |
| |
| /* In the case of the PA-RISC, the frame's nominal address |
| is the address of a 4-byte word containing the calling frame's |
| address (previous FP). */ |
| |
| #define FRAME_CHAIN(thisframe) frame_chain (thisframe) |
| extern CORE_ADDR frame_chain PARAMS ((struct frame_info *)); |
| |
| extern int hppa_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); |
| #define FRAME_CHAIN_VALID(chain, thisframe) hppa_frame_chain_valid (chain, thisframe) |
| |
| #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) |
| |
| /* 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_function_invocation (FI)) |
| extern int frameless_function_invocation PARAMS ((struct frame_info *)); |
| |
| extern CORE_ADDR hppa_frame_saved_pc PARAMS ((struct frame_info * frame)); |
| #define FRAME_SAVED_PC(FRAME) hppa_frame_saved_pc (FRAME) |
| |
| #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
| |
| #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
| /* 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(fi) (-1) |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 0 |
| |
| #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
| hppa_frame_find_saved_regs (frame_info, &frame_saved_regs) |
| extern void |
| hppa_frame_find_saved_regs PARAMS ((struct frame_info *, |
| struct frame_saved_regs *)); |
| |
| |
| /* Things needed for making the inferior call functions. */ |
| |
| /* Push an empty stack frame, to record the current PC, etc. */ |
| |
| #define PUSH_DUMMY_FRAME push_dummy_frame (inf_status) |
| extern void push_dummy_frame PARAMS ((struct inferior_status *)); |
| |
| /* Discard from the stack the innermost frame, |
| restoring all saved registers. */ |
| #define POP_FRAME hppa_pop_frame () |
| extern void hppa_pop_frame PARAMS ((void)); |
| |
| #define INSTRUCTION_SIZE 4 |
| |
| #ifndef PA_LEVEL_0 |
| |
| /* Non-level zero PA's have space registers (but they don't always have |
| floating-point, do they???? */ |
| |
| /* This sequence of words is the instructions |
| |
| ; Call stack frame has already been built by gdb. Since we could be calling |
| ; a varargs function, and we do not have the benefit of a stub to put things in |
| ; the right place, we load the first 4 word of arguments into both the general |
| ; and fp registers. |
| call_dummy |
| ldw -36(sp), arg0 |
| ldw -40(sp), arg1 |
| ldw -44(sp), arg2 |
| ldw -48(sp), arg3 |
| ldo -36(sp), r1 |
| fldws 0(0, r1), fr4 |
| fldds -4(0, r1), fr5 |
| fldws -8(0, r1), fr6 |
| fldds -12(0, r1), fr7 |
| ldil 0, r22 ; FUNC_LDIL_OFFSET must point here |
| ldo 0(r22), r22 ; FUNC_LDO_OFFSET must point here |
| ldsid (0,r22), r4 |
| ldil 0, r1 ; SR4EXPORT_LDIL_OFFSET must point here |
| ldo 0(r1), r1 ; SR4EXPORT_LDO_OFFSET must point here |
| ldsid (0,r1), r20 |
| combt,=,n r4, r20, text_space ; If target is in data space, do a |
| ble 0(sr5, r22) ; "normal" procedure call |
| copy r31, r2 |
| break 4, 8 |
| mtsp r21, sr0 |
| ble,n 0(sr0, r22) |
| text_space ; Otherwise, go through _sr4export, |
| ble (sr4, r1) ; which will return back here. |
| stw r31,-24(r30) |
| break 4, 8 |
| mtsp r21, sr0 |
| ble,n 0(sr0, r22) |
| nop ; To avoid kernel bugs |
| nop ; and keep the dummy 8 byte aligned |
| |
| The dummy decides if the target is in text space or data space. If |
| it's in data space, there's no problem because the target can |
| return back to the dummy. However, if the target is in text space, |
| the dummy calls the secret, undocumented routine _sr4export, which |
| calls a function in text space and can return to any space. Instead |
| of including fake instructions to represent saved registers, we |
| know that the frame is associated with the call dummy and treat it |
| specially. |
| |
| The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1 |
| kernels. If the memory at the location pointed to by the PC is |
| 0xffffffff then a ptrace step call will fail (even if the instruction |
| is nullified). |
| |
| The code to pop a dummy frame single steps three instructions |
| starting with the last mtsp. This includes the nullified "instruction" |
| following the ble (which is uninitialized junk). If the |
| "instruction" following the last BLE is 0xffffffff, then the ptrace |
| will fail and the dummy frame is not correctly popped. |
| |
| By placing a NOP in the delay slot of the BLE instruction we can be |
| sure that we never try to execute a 0xffffffff instruction and |
| avoid the kernel bug. The second NOP is needed to keep the call |
| dummy 8 byte aligned. */ |
| |
| /* Define offsets into the call dummy for the target function address */ |
| #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9) |
| #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10) |
| |
| /* Define offsets into the call dummy for the _sr4export address */ |
| #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12) |
| #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13) |
| |
| #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\ |
| 0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\ |
| 0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\ |
| 0x20200000, 0x34210000, 0x002010b4, 0x82842022,\ |
| 0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\ |
| 0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\ |
| 0x00151820, 0xe6c00002, 0x08000240, 0x08000240} |
| |
| #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28) |
| #define REG_PARM_STACK_SPACE 16 |
| |
| #else /* defined PA_LEVEL_0 */ |
| |
| /* This is the call dummy for a level 0 PA. Level 0's don't have space |
| registers (or floating point??), so we skip all that inter-space call stuff, |
| and avoid touching the fp regs. |
| |
| call_dummy |
| |
| ldw -36(%sp), %arg0 |
| ldw -40(%sp), %arg1 |
| ldw -44(%sp), %arg2 |
| ldw -48(%sp), %arg3 |
| ldil 0, %r31 ; FUNC_LDIL_OFFSET must point here |
| ldo 0(%r31), %r31 ; FUNC_LDO_OFFSET must point here |
| ble 0(%sr0, %r31) |
| copy %r31, %r2 |
| break 4, 8 |
| nop ; restore_pc_queue expects these |
| bv,n 0(%r22) ; instructions to be here... |
| nop |
| */ |
| |
| /* Define offsets into the call dummy for the target function address */ |
| #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4) |
| #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5) |
| |
| #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\ |
| 0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\ |
| 0x00010004, 0x08000240, 0xeac0c002, 0x08000240} |
| |
| #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12) |
| |
| #endif |
| |
| #define CALL_DUMMY_START_OFFSET 0 |
| |
| /* If we've reached a trap instruction within the call dummy, then |
| we'll consider that to mean that we've reached the call dummy's |
| end after its successful completion. */ |
| #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \ |
| (PC_IN_CALL_DUMMY((pc), (sp), (frame_address)) && \ |
| (read_memory_integer((pc), 4) == BREAKPOINT32)) |
| |
| /* |
| * Insert the specified number of args and function address |
| * into a call sequence of the above form stored at DUMMYNAME. |
| * |
| * On the hppa we need to call the stack dummy through $$dyncall. |
| * Therefore our version of FIX_CALL_DUMMY takes an extra argument, |
| * real_pc, which is the location where gdb should start up the |
| * inferior to do the function call. |
| */ |
| |
| #define FIX_CALL_DUMMY hppa_fix_call_dummy |
| |
| extern CORE_ADDR |
| hppa_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR, int, |
| struct value **, struct type *, int)); |
| |
| #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ |
| (hppa_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))) |
| extern CORE_ADDR |
| hppa_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, |
| CORE_ADDR)); |
| |
| /* The low two bits of the PC on the PA contain the privilege level. Some |
| genius implementing a (non-GCC) compiler apparently decided this means |
| that "addresses" in a text section therefore include a privilege level, |
| and thus symbol tables should contain these bits. This seems like a |
| bonehead thing to do--anyway, it seems to work for our purposes to just |
| ignore those bits. */ |
| #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x3) |
| |
| #define GDB_TARGET_IS_HPPA |
| |
| #define BELIEVE_PCC_PROMOTION 1 |
| |
| /* |
| * Unwind table and descriptor. |
| */ |
| |
| struct unwind_table_entry |
| { |
| CORE_ADDR region_start; |
| CORE_ADDR region_end; |
| |
| unsigned int Cannot_unwind:1; /* 0 */ |
| unsigned int Millicode:1; /* 1 */ |
| unsigned int Millicode_save_sr0:1; /* 2 */ |
| unsigned int Region_description:2; /* 3..4 */ |
| unsigned int reserved1:1; /* 5 */ |
| unsigned int Entry_SR:1; /* 6 */ |
| unsigned int Entry_FR:4; /* number saved *//* 7..10 */ |
| unsigned int Entry_GR:5; /* number saved *//* 11..15 */ |
| unsigned int Args_stored:1; /* 16 */ |
| unsigned int Variable_Frame:1; /* 17 */ |
| unsigned int Separate_Package_Body:1; /* 18 */ |
| unsigned int Frame_Extension_Millicode:1; /* 19 */ |
| unsigned int Stack_Overflow_Check:1; /* 20 */ |
| unsigned int Two_Instruction_SP_Increment:1; /* 21 */ |
| unsigned int Ada_Region:1; /* 22 */ |
| unsigned int cxx_info:1; /* 23 */ |
| unsigned int cxx_try_catch:1; /* 24 */ |
| unsigned int sched_entry_seq:1; /* 25 */ |
| unsigned int reserved2:1; /* 26 */ |
| unsigned int Save_SP:1; /* 27 */ |
| unsigned int Save_RP:1; /* 28 */ |
| unsigned int Save_MRP_in_frame:1; /* 29 */ |
| unsigned int extn_ptr_defined:1; /* 30 */ |
| unsigned int Cleanup_defined:1; /* 31 */ |
| |
| unsigned int MPE_XL_interrupt_marker:1; /* 0 */ |
| unsigned int HP_UX_interrupt_marker:1; /* 1 */ |
| unsigned int Large_frame:1; /* 2 */ |
| unsigned int Pseudo_SP_Set:1; /* 3 */ |
| unsigned int reserved4:1; /* 4 */ |
| unsigned int Total_frame_size:27; /* 5..31 */ |
| |
| /* This is *NOT* part of an actual unwind_descriptor in an object |
| file. It is *ONLY* part of the "internalized" descriptors that |
| we create from those in a file. |
| */ |
| struct |
| { |
| unsigned int stub_type:4; /* 0..3 */ |
| unsigned int padding:28; /* 4..31 */ |
| } |
| stub_unwind; |
| }; |
| |
| /* HP linkers also generate unwinds for various linker-generated stubs. |
| GDB reads in the stubs from the $UNWIND_END$ subspace, then |
| "converts" them into normal unwind entries using some of the reserved |
| fields to store the stub type. */ |
| |
| struct stub_unwind_entry |
| { |
| /* The offset within the executable for the associated stub. */ |
| unsigned stub_offset; |
| |
| /* The type of stub this unwind entry describes. */ |
| char type; |
| |
| /* Unknown. Not needed by GDB at this time. */ |
| char prs_info; |
| |
| /* Length (in instructions) of the associated stub. */ |
| short stub_length; |
| }; |
| |
| /* Sizes (in bytes) of the native unwind entries. */ |
| #define UNWIND_ENTRY_SIZE 16 |
| #define STUB_UNWIND_ENTRY_SIZE 8 |
| |
| /* The gaps represent linker stubs used in MPE and space for future |
| expansion. */ |
| enum unwind_stub_types |
| { |
| LONG_BRANCH = 1, |
| PARAMETER_RELOCATION = 2, |
| EXPORT = 10, |
| IMPORT = 11, |
| IMPORT_SHLIB = 12, |
| }; |
| |
| /* We use the objfile->obj_private pointer for two things: |
| |
| * 1. An unwind table; |
| * |
| * 2. A pointer to any associated shared library object. |
| * |
| * #defines are used to help refer to these objects. |
| */ |
| |
| /* Info about the unwind table associated with an object file. |
| |
| * This is hung off of the "objfile->obj_private" pointer, and |
| * is allocated in the objfile's psymbol obstack. This allows |
| * us to have unique unwind info for each executable and shared |
| * library that we are debugging. |
| */ |
| struct obj_unwind_info |
| { |
| struct unwind_table_entry *table; /* Pointer to unwind info */ |
| struct unwind_table_entry *cache; /* Pointer to last entry we found */ |
| int last; /* Index of last entry */ |
| }; |
| |
| typedef struct obj_private_struct |
| { |
| struct obj_unwind_info *unwind_info; /* a pointer */ |
| struct so_list *so_info; /* a pointer */ |
| CORE_ADDR dp; |
| } |
| obj_private_data_t; |
| |
| #if 0 |
| extern void target_write_pc |
| PARAMS ((CORE_ADDR, int)) |
| extern CORE_ADDR target_read_pc PARAMS ((int)); |
| extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *)); |
| #endif |
| |
| #define TARGET_READ_PC(pid) target_read_pc (pid) |
| extern CORE_ADDR target_read_pc PARAMS ((int)); |
| |
| #define TARGET_WRITE_PC(v,pid) target_write_pc (v,pid) |
| extern void target_write_pc PARAMS ((CORE_ADDR, int)); |
| |
| #define TARGET_READ_FP() target_read_fp (inferior_pid) |
| extern CORE_ADDR target_read_fp PARAMS ((int)); |
| |
| /* For a number of horrible reasons we may have to adjust the location |
| of variables on the stack. Ugh. */ |
| #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR) |
| |
| extern int hpread_adjust_stack_address PARAMS ((CORE_ADDR)); |
| |
| /* 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 pa, it appears that the debug info marks the parameters as |
| floats regardless of whether the function is prototyped, but the actual |
| values are passed as doubles for the non-prototyped case and floats for |
| the prototyped case. Thus we choose to make the non-prototyped case work |
| for C and break the prototyped case, since the non-prototyped case is |
| probably much more common. (FIXME). */ |
| |
| #define COERCE_FLOAT_TO_DOUBLE(formal, actual) (current_language -> la_language == language_c) |
| |
| /* Here's how to step off a permanent breakpoint. */ |
| #define SKIP_PERMANENT_BREAKPOINT (hppa_skip_permanent_breakpoint) |
| extern void hppa_skip_permanent_breakpoint (void); |
| |
| /* On HP-UX, certain system routines (millicode) have names beginning |
| with $ or $$, e.g. $$dyncall, which handles inter-space procedure |
| calls on PA-RISC. Tell the expression parser to check for those |
| when parsing tokens that begin with "$". */ |
| #define SYMBOLS_CAN_START_WITH_DOLLAR (1) |