| /* Target machine description for generic Motorola 88000, for GDB. |
| Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1993, 1994, 1996, 1998, |
| 1999, 2000 |
| Free Software Foundation, Inc. |
| |
| 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. */ |
| |
| /* g++ support is not yet included. */ |
| |
| /* Define the bit, byte, and word ordering of the machine. */ |
| #define TARGET_BYTE_ORDER BIG_ENDIAN |
| |
| /* We cache information about saved registers in the frame structure, |
| to save us from having to re-scan function prologues every time |
| a register in a non-current frame is accessed. */ |
| |
| #define EXTRA_FRAME_INFO \ |
| struct frame_saved_regs *fsr; \ |
| CORE_ADDR locals_pointer; \ |
| CORE_ADDR args_pointer; |
| |
| /* Zero the frame_saved_regs pointer when the frame is initialized, |
| so that FRAME_FIND_SAVED_REGS () will know to allocate and |
| initialize a frame_saved_regs struct the first time it is called. |
| Set the arg_pointer to -1, which is not valid; 0 and other values |
| indicate real, cached values. */ |
| |
| #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ |
| init_extra_frame_info (fromleaf, fi) |
| extern void init_extra_frame_info (); |
| |
| #define IEEE_FLOAT (1) |
| |
| /* 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 m88k_skip_prologue (CORE_ADDR); |
| #define SKIP_PROLOGUE(frompc) (m88k_skip_prologue (frompc)) |
| |
| /* The m88k kernel aligns all instructions on 4-byte boundaries. The |
| kernel also uses the least significant two bits for its own hocus |
| pocus. When gdb receives an address from the kernel, it needs to |
| preserve those right-most two bits, but gdb also needs to be careful |
| to realize that those two bits are not really a part of the address |
| of an instruction. Shrug. */ |
| |
| extern CORE_ADDR m88k_addr_bits_remove (CORE_ADDR); |
| #define ADDR_BITS_REMOVE(addr) m88k_addr_bits_remove (addr) |
| |
| /* Immediately after a function call, return the saved pc. |
| Can't always 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) \ |
| (ADDR_BITS_REMOVE (read_register (SRP_REGNUM))) |
| |
| /* Stack grows downward. */ |
| |
| #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) |
| |
| /* Sequence of bytes for breakpoint instruction. */ |
| |
| /* instruction 0xF000D1FF is 'tb0 0,r0,511' |
| If Bit bit 0 of r0 is clear (always true), |
| initiate exception processing (trap). |
| */ |
| #define BREAKPOINT {0xF0, 0x00, 0xD1, 0xFF} |
| |
| /* 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 |
| |
| /* Number of machine registers */ |
| |
| #define GP_REGS (38) |
| #define FP_REGS (32) |
| #define NUM_REGS (GP_REGS + FP_REGS) |
| |
| /* 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",\ |
| "psr",\ |
| "fpsr",\ |
| "fpcr",\ |
| "sxip",\ |
| "snip",\ |
| "sfip",\ |
| "x0",\ |
| "x1",\ |
| "x2",\ |
| "x3",\ |
| "x4",\ |
| "x5",\ |
| "x6",\ |
| "x7",\ |
| "x8",\ |
| "x9",\ |
| "x10",\ |
| "x11",\ |
| "x12",\ |
| "x13",\ |
| "x14",\ |
| "x15",\ |
| "x16",\ |
| "x17",\ |
| "x18",\ |
| "x19",\ |
| "x20",\ |
| "x21",\ |
| "x22",\ |
| "x23",\ |
| "x24",\ |
| "x25",\ |
| "x26",\ |
| "x27",\ |
| "x28",\ |
| "x29",\ |
| "x30",\ |
| "x31",\ |
| "vbr",\ |
| "dmt0",\ |
| "dmd0",\ |
| "dma0",\ |
| "dmt1",\ |
| "dmd1",\ |
| "dma1",\ |
| "dmt2",\ |
| "dmd2",\ |
| "dma2",\ |
| "sr0",\ |
| "sr1",\ |
| "sr2",\ |
| "sr3",\ |
| "fpecr",\ |
| "fphs1",\ |
| "fpls1",\ |
| "fphs2",\ |
| "fpls2",\ |
| "fppt",\ |
| "fprh",\ |
| "fprl",\ |
| "fpit",\ |
| "fpsr",\ |
| "fpcr",\ |
| } |
| |
| |
| /* 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 /* Contains the constant zero */ |
| #define SRP_REGNUM 1 /* Contains subroutine return pointer */ |
| #define RV_REGNUM 2 /* Contains simple return values */ |
| #define SRA_REGNUM 12 /* Contains address of struct return values */ |
| #define SP_REGNUM 31 /* Contains address of top of stack */ |
| |
| /* Instruction pointer notes... |
| |
| On the m88100: |
| |
| * cr04 = sxip. On exception, contains the excepting pc (probably). |
| On rte, is ignored. |
| |
| * cr05 = snip. On exception, contains the NPC (next pc). On rte, |
| pc is loaded from here. |
| |
| * cr06 = sfip. On exception, contains the NNPC (next next pc). On |
| rte, the NPC is loaded from here. |
| |
| * lower two bits of each are flag bits. Bit 1 is V means address |
| is valid. If address is not valid, bit 0 is ignored. Otherwise, |
| bit 0 is E and asks for an exception to be taken if this |
| instruction is executed. |
| |
| On the m88110: |
| |
| * cr04 = exip. On exception, contains the address of the excepting |
| pc (always). On rte, pc is loaded from here. Bit 0, aka the D |
| bit, is a flag saying that the offending instruction was in a |
| branch delay slot. If set, then cr05 contains the NPC. |
| |
| * cr05 = enip. On exception, if the instruction pointed to by cr04 |
| was in a delay slot as indicated by the bit 0 of cr04, aka the D |
| bit, the cr05 contains the NPC. Otherwise ignored. |
| |
| * cr06 is invalid */ |
| |
| /* Note that the Harris Unix kernels emulate the m88100's behavior on |
| the m88110. */ |
| |
| #define SXIP_REGNUM 35 /* On m88100, Contains Shadow Execute |
| Instruction Pointer. */ |
| #define SNIP_REGNUM 36 /* On m88100, Contains Shadow Next |
| Instruction Pointer. */ |
| #define SFIP_REGNUM 37 /* On m88100, Contains Shadow Fetched |
| Intruction pointer. */ |
| |
| #define EXIP_REGNUM 35 /* On m88110, Contains Exception |
| Executing Instruction Pointer. */ |
| #define ENIP_REGNUM 36 /* On m88110, Contains the Exception |
| Next Instruction Pointer. */ |
| |
| #define PC_REGNUM SXIP_REGNUM /* Program Counter */ |
| #define NPC_REGNUM SNIP_REGNUM /* Next Program Counter */ |
| #define NNPC_REGNUM SFIP_REGNUM /* Next Next Program Counter */ |
| |
| #define PSR_REGNUM 32 /* Processor Status Register */ |
| #define FPSR_REGNUM 33 /* Floating Point Status Register */ |
| #define FPCR_REGNUM 34 /* Floating Point Control Register */ |
| #define XFP_REGNUM 38 /* First Extended Float Register */ |
| #define X0_REGNUM XFP_REGNUM /* Which also contains the constant zero */ |
| |
| /* This is rather a confusing lie. Our m88k port using a stack pointer value |
| for the frame address. Hence, the frame address and the frame pointer are |
| only indirectly related. The value of this macro is the register number |
| fetched by the machine "independent" portions of gdb when they want to know |
| about a frame address. Thus, we lie here and claim that FP_REGNUM is |
| SP_REGNUM. */ |
| #define FP_REGNUM SP_REGNUM /* Reg fetched to locate frame when pgm stops */ |
| #define ACTUAL_FP_REGNUM 30 |
| |
| /* PSR status bit definitions. */ |
| |
| #define PSR_MODE 0x80000000 |
| #define PSR_BYTE_ORDER 0x40000000 |
| #define PSR_SERIAL_MODE 0x20000000 |
| #define PSR_CARRY 0x10000000 |
| #define PSR_SFU_DISABLE 0x000003f0 |
| #define PSR_SFU1_DISABLE 0x00000008 |
| #define PSR_MXM 0x00000004 |
| #define PSR_IND 0x00000002 |
| #define PSR_SFRZ 0x00000001 |
| |
| |
| |
| /* The following two comments come from the days prior to the m88110 |
| port. The m88110 handles the instruction pointers differently. I |
| do not know what any m88110 kernels do as the m88110 port I'm |
| working with is for an embedded system. rich@cygnus.com |
| 13-sept-93. */ |
| |
| /* BCS requires that the SXIP_REGNUM (or PC_REGNUM) contain the |
| address of the next instr to be executed when a breakpoint occurs. |
| Because the kernel gets the next instr (SNIP_REGNUM), the instr in |
| SNIP needs to be put back into SFIP, and the instr in SXIP should |
| be shifted to SNIP */ |
| |
| /* Are you sitting down? It turns out that the 88K BCS (binary |
| compatibility standard) folks originally felt that the debugger |
| should be responsible for backing up the IPs, not the kernel (as is |
| usually done). Well, they have reversed their decision, and in |
| future releases our kernel will be handling the backing up of the |
| IPs. So, eventually, we won't need to do the SHIFT_INST_REGS |
| stuff. But, for now, since there are 88K systems out there that do |
| need the debugger to do the IP shifting, and since there will be |
| systems where the kernel does the shifting, the code is a little |
| more complex than perhaps it needs to be (we still go inside |
| SHIFT_INST_REGS, and if the shifting hasn't occurred then gdb goes |
| ahead and shifts). */ |
| |
| extern int target_is_m88110; |
| #define SHIFT_INST_REGS() \ |
| if (!target_is_m88110) \ |
| { \ |
| CORE_ADDR pc = read_register (PC_REGNUM); \ |
| CORE_ADDR npc = read_register (NPC_REGNUM); \ |
| if (pc != npc) \ |
| { \ |
| write_register (NNPC_REGNUM, npc); \ |
| write_register (NPC_REGNUM, pc); \ |
| } \ |
| } |
| |
| /* Storing the following registers is a no-op. */ |
| #define CANNOT_STORE_REGISTER(regno) (((regno) == R0_REGNUM) \ |
| || ((regno) == X0_REGNUM)) |
| |
| /* Number of bytes of storage in the actual machine representation |
| for register N. On the m88k, the general purpose registers are 4 |
| bytes and the 88110 extended registers are 10 bytes. */ |
| |
| #define REGISTER_RAW_SIZE(N) ((N) < XFP_REGNUM ? 4 : 10) |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register state, the array `registers'. */ |
| |
| #define REGISTER_BYTES ((GP_REGS * REGISTER_RAW_SIZE(0)) \ |
| + (FP_REGS * REGISTER_RAW_SIZE(XFP_REGNUM))) |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| |
| #define REGISTER_BYTE(N) (((N) * REGISTER_RAW_SIZE(0)) \ |
| + ((N) >= XFP_REGNUM \ |
| ? (((N) - XFP_REGNUM) \ |
| * REGISTER_RAW_SIZE(XFP_REGNUM)) \ |
| : 0)) |
| |
| /* Number of bytes of storage in the program's representation for |
| register N. On the m88k, all registers are 4 bytes excepting the |
| m88110 extended registers which are 8 byte doubles. */ |
| |
| #define REGISTER_VIRTUAL_SIZE(N) ((N) < XFP_REGNUM ? 4 : 8) |
| |
| /* Largest value REGISTER_RAW_SIZE can have. */ |
| |
| #define MAX_REGISTER_RAW_SIZE (REGISTER_RAW_SIZE(XFP_REGNUM)) |
| |
| /* Largest value REGISTER_VIRTUAL_SIZE can have. |
| Are FPS1, FPS2, FPR "virtual" regisers? */ |
| |
| #define MAX_REGISTER_VIRTUAL_SIZE (REGISTER_RAW_SIZE(XFP_REGNUM)) |
| |
| /* Nonzero if register N requires conversion |
| from raw format to virtual format. */ |
| |
| #define REGISTER_CONVERTIBLE(N) ((N) >= XFP_REGNUM) |
| |
| #include "floatformat.h" |
| |
| /* 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) \ |
| { \ |
| double val; \ |
| floatformat_to_double (&floatformat_m88110_ext, (FROM), &val); \ |
| store_floating ((TO), TYPE_LENGTH (TYPE), val); \ |
| } |
| |
| /* 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) \ |
| { \ |
| double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ |
| floatformat_from_double (&floatformat_m88110_ext, &val, (TO)); \ |
| } |
| |
| /* Return the GDB type object for the "standard" data type |
| of data in register N. */ |
| |
| #define REGISTER_VIRTUAL_TYPE(N) \ |
| ((N) >= XFP_REGNUM \ |
| ? builtin_type_double \ |
| : ((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM \ |
| ? lookup_pointer_type (builtin_type_void) : builtin_type_int)) |
| |
| /* The 88k call/return conventions call for "small" values to be returned |
| into consecutive registers starting from r2. */ |
| |
| #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| memcpy ((VALBUF), &(((char *)REGBUF)[REGISTER_BYTE(RV_REGNUM)]), TYPE_LENGTH (TYPE)) |
| |
| #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. */ |
| |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| write_register_bytes (2*REGISTER_RAW_SIZE(0), (VALBUF), TYPE_LENGTH (TYPE)) |
| |
| /* In COFF, if PCC says a parameter is a short or a char, do not |
| change it to int (it seems the convention is to change it). */ |
| |
| #define BELIEVE_PCC_PROMOTION 1 |
| |
| /* 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. |
| |
| However, if FRAME_CHAIN_VALID returns zero, |
| it means the given frame is the outermost one and has no caller. */ |
| |
| extern CORE_ADDR frame_chain (); |
| extern int frame_chain_valid (); |
| extern int frameless_function_invocation (); |
| |
| #define FRAME_CHAIN(thisframe) \ |
| frame_chain (thisframe) |
| |
| #define FRAMELESS_FUNCTION_INVOCATION(frame) \ |
| (frameless_function_invocation (frame)) |
| |
| /* Define other aspects of the stack frame. */ |
| |
| #define FRAME_SAVED_PC(FRAME) \ |
| frame_saved_pc (FRAME) |
| extern CORE_ADDR frame_saved_pc (); |
| |
| #define FRAME_ARGS_ADDRESS(fi) \ |
| frame_args_address (fi) |
| extern CORE_ADDR frame_args_address (); |
| |
| #define FRAME_LOCALS_ADDRESS(fi) \ |
| frame_locals_address (fi) |
| extern CORE_ADDR frame_locals_address (); |
| |
| /* Return number of args passed to a frame. |
| Can return -1, meaning no way to tell. */ |
| |
| #define FRAME_NUM_ARGS(fi) (-1) |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 0 |
| |
| /* 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. */ |
| |
| /* On the 88k, parameter registers get stored into the so called "homing" |
| area. This *always* happens when you compiled with GCC and use -g. |
| Also, (with GCC and -g) the saving of the parameter register values |
| always happens right within the function prologue code, so these register |
| values can generally be relied upon to be already copied into their |
| respective homing slots by the time you will normally try to look at |
| them (we hope). |
| |
| Note that homing area stack slots are always at *positive* offsets from |
| the frame pointer. Thus, the homing area stack slots for the parameter |
| registers (passed values) for a given function are actually part of the |
| frame area of the caller. This is unusual, but it should not present |
| any special problems for GDB. |
| |
| Note also that on the 88k, we are only interested in finding the |
| registers that might have been saved in memory. This is a subset of |
| the whole set of registers because the standard calling sequence allows |
| the called routine to clobber many registers. |
| |
| We could manage to locate values for all of the so called "preserved" |
| registers (some of which may get saved within any particular frame) but |
| that would require decoding all of the tdesc information. That would be |
| nice information for GDB to have, but it is not strictly manditory if we |
| can live without the ability to look at values within (or backup to) |
| previous frames. |
| */ |
| |
| struct frame_saved_regs; |
| struct frame_info; |
| |
| void frame_find_saved_regs (struct frame_info *fi, |
| struct frame_saved_regs *fsr); |
| |
| #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
| frame_find_saved_regs (frame_info, &frame_saved_regs) |
| |
| |
| #define POP_FRAME pop_frame () |
| extern void pop_frame (); |
| |
| /* Call function stuff contributed by Kevin Buettner of Motorola. */ |
| |
| #define CALL_DUMMY_LOCATION AFTER_TEXT_END |
| |
| extern void m88k_push_dummy_frame (); |
| #define PUSH_DUMMY_FRAME m88k_push_dummy_frame() |
| |
| #define CALL_DUMMY { \ |
| 0x67ff00c0, /* 0: subu #sp,#sp,0xc0 */ \ |
| 0x243f0004, /* 4: st #r1,#sp,0x4 */ \ |
| 0x245f0008, /* 8: st #r2,#sp,0x8 */ \ |
| 0x247f000c, /* c: st #r3,#sp,0xc */ \ |
| 0x249f0010, /* 10: st #r4,#sp,0x10 */ \ |
| 0x24bf0014, /* 14: st #r5,#sp,0x14 */ \ |
| 0x24df0018, /* 18: st #r6,#sp,0x18 */ \ |
| 0x24ff001c, /* 1c: st #r7,#sp,0x1c */ \ |
| 0x251f0020, /* 20: st #r8,#sp,0x20 */ \ |
| 0x253f0024, /* 24: st #r9,#sp,0x24 */ \ |
| 0x255f0028, /* 28: st #r10,#sp,0x28 */ \ |
| 0x257f002c, /* 2c: st #r11,#sp,0x2c */ \ |
| 0x259f0030, /* 30: st #r12,#sp,0x30 */ \ |
| 0x25bf0034, /* 34: st #r13,#sp,0x34 */ \ |
| 0x25df0038, /* 38: st #r14,#sp,0x38 */ \ |
| 0x25ff003c, /* 3c: st #r15,#sp,0x3c */ \ |
| 0x261f0040, /* 40: st #r16,#sp,0x40 */ \ |
| 0x263f0044, /* 44: st #r17,#sp,0x44 */ \ |
| 0x265f0048, /* 48: st #r18,#sp,0x48 */ \ |
| 0x267f004c, /* 4c: st #r19,#sp,0x4c */ \ |
| 0x269f0050, /* 50: st #r20,#sp,0x50 */ \ |
| 0x26bf0054, /* 54: st #r21,#sp,0x54 */ \ |
| 0x26df0058, /* 58: st #r22,#sp,0x58 */ \ |
| 0x26ff005c, /* 5c: st #r23,#sp,0x5c */ \ |
| 0x271f0060, /* 60: st #r24,#sp,0x60 */ \ |
| 0x273f0064, /* 64: st #r25,#sp,0x64 */ \ |
| 0x275f0068, /* 68: st #r26,#sp,0x68 */ \ |
| 0x277f006c, /* 6c: st #r27,#sp,0x6c */ \ |
| 0x279f0070, /* 70: st #r28,#sp,0x70 */ \ |
| 0x27bf0074, /* 74: st #r29,#sp,0x74 */ \ |
| 0x27df0078, /* 78: st #r30,#sp,0x78 */ \ |
| 0x63df0000, /* 7c: addu #r30,#sp,0x0 */ \ |
| 0x145f0000, /* 80: ld #r2,#sp,0x0 */ \ |
| 0x147f0004, /* 84: ld #r3,#sp,0x4 */ \ |
| 0x149f0008, /* 88: ld #r4,#sp,0x8 */ \ |
| 0x14bf000c, /* 8c: ld #r5,#sp,0xc */ \ |
| 0x14df0010, /* 90: ld #r6,#sp,0x10 */ \ |
| 0x14ff0014, /* 94: ld #r7,#sp,0x14 */ \ |
| 0x151f0018, /* 98: ld #r8,#sp,0x18 */ \ |
| 0x153f001c, /* 9c: ld #r9,#sp,0x1c */ \ |
| 0x5c200000, /* a0: or.u #r1,#r0,0x0 */ \ |
| 0x58210000, /* a4: or #r1,#r1,0x0 */ \ |
| 0xf400c801, /* a8: jsr #r1 */ \ |
| 0xf000d1ff /* ac: tb0 0x0,#r0,0x1ff */ \ |
| } |
| |
| #define CALL_DUMMY_START_OFFSET 0x80 |
| #define CALL_DUMMY_LENGTH 0xb0 |
| |
| /* FIXME: byteswapping. */ |
| #define FIX_CALL_DUMMY(dummy, pc, fun, nargs, args, type, gcc_p) \ |
| { \ |
| *(unsigned long *)((char *) (dummy) + 0xa0) |= \ |
| (((unsigned long) (fun)) >> 16); \ |
| *(unsigned long *)((char *) (dummy) + 0xa4) |= \ |
| (((unsigned long) (fun)) & 0xffff); \ |
| pc = text_end; \ |
| } |
| |
| /* Stack must be aligned on 64-bit boundaries when synthesizing |
| function calls. */ |
| |
| #define STACK_ALIGN(addr) (((addr) + 7) & -8) |
| |
| #define STORE_STRUCT_RETURN(addr, sp) \ |
| write_register (SRA_REGNUM, (addr)) |
| |
| #define NEED_TEXT_START_END 1 |
| |
| /* According to the MC88100 RISC Microprocessor User's Manual, section |
| 6.4.3.1.2: |
| |
| ... can be made to return to a particular instruction by placing a |
| valid instruction address in the SNIP and the next sequential |
| instruction address in the SFIP (with V bits set and E bits clear). |
| The rte resumes execution at the instruction pointed to by the |
| SNIP, then the SFIP. |
| |
| The E bit is the least significant bit (bit 0). The V (valid) bit is |
| bit 1. This is why we logical or 2 into the values we are writing |
| below. It turns out that SXIP plays no role when returning from an |
| exception so nothing special has to be done with it. We could even |
| (presumably) give it a totally bogus value. |
| |
| -- Kevin Buettner |
| */ |
| |
| #define TARGET_WRITE_PC(val, pid) { \ |
| write_register_pid(SXIP_REGNUM, (long) val, pid); \ |
| write_register_pid(SNIP_REGNUM, (long) val | 2, pid); \ |
| write_register_pid(SFIP_REGNUM, ((long) val | 2) + 4, pid); \ |
| } |