/* OBSOLETE /* Target machine description for VxWorks on the 29k, for GDB, the GNU debugger. */ /* OBSOLETE Copyright 1994, 1995, 1998, 1999, 2000 Free Software Foundation, Inc. */ /* OBSOLETE Contributed by Cygnus Support. */ /* OBSOLETE */ /* OBSOLETE This file is part of GDB. */ /* OBSOLETE */ /* OBSOLETE This program is free software; you can redistribute it and/or modify */ /* OBSOLETE it under the terms of the GNU General Public License as published by */ /* OBSOLETE the Free Software Foundation; either version 2 of the License, or */ /* OBSOLETE (at your option) any later version. */ /* OBSOLETE */ /* OBSOLETE This program is distributed in the hope that it will be useful, */ /* OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* OBSOLETE GNU General Public License for more details. */ /* OBSOLETE */ /* OBSOLETE You should have received a copy of the GNU General Public License */ /* OBSOLETE along with this program; if not, write to the Free Software */ /* OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, */ /* OBSOLETE Boston, MA 02111-1307, USA. */ */ /* OBSOLETE */ /* OBSOLETE #include "regcache.h" */ /* OBSOLETE #include "value.h" */ /* OBSOLETE #include "a29k/tm-a29k.h" */ /* OBSOLETE #include "tm-vxworks.h" */ /* OBSOLETE */ /* OBSOLETE /* Number of registers in a ptrace_getregs call. */ */ /* OBSOLETE */ /* OBSOLETE #define VX_NUM_REGS (NUM_REGS) */ /* OBSOLETE */ /* OBSOLETE /* Number of registers in a ptrace_getfpregs call. */ */ /* OBSOLETE */ /* OBSOLETE /* #define VX_SIZE_FPREGS */ */ /* OBSOLETE */ /* OBSOLETE /* This is almost certainly the wrong place for this: */ */ /* OBSOLETE #define LR2_REGNUM 34 */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* Vxworks has its own CALL_DUMMY since it manages breakpoints in the kernel */ */ /* OBSOLETE */ /* OBSOLETE #undef CALL_DUMMY */ /* OBSOLETE */ /* OBSOLETE /* Replace the breakpoint instruction in the CALL_DUMMY with a nop. */ /* OBSOLETE For Vxworks, the breakpoint is set and deleted by calls to */ /* OBSOLETE CALL_DUMMY_BREAK_SET and CALL_DUMMY_BREAK_DELETE. */ */ /* OBSOLETE */ /* OBSOLETE #error "This file is broken. GDB does not define HOST_BYTE_ORDER." */ /* OBSOLETE #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER */ /* OBSOLETE #define CALL_DUMMY {0x0400870f,\ */ /* OBSOLETE 0x36008200|(MSP_HW_REGNUM), \ */ /* OBSOLETE 0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16), \ */ /* OBSOLETE 0x03ff80ff, 0x02ff80ff, 0xc8008080, 0x70400101, 0x70400101} */ /* OBSOLETE #else /* Byte order differs. */ */ /* OBSOLETE #define CALL_DUMMY {0x0f870004,\ */ /* OBSOLETE 0x00820036|(MSP_HW_REGNUM << 24), \ */ /* OBSOLETE 0x40000015|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16), \ */ /* OBSOLETE 0xff80ff03, 0xff80ff02, 0x808000c8, 0x01014070, 0x01014070} */ /* OBSOLETE #endif /* Byte order differs. */ */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* For the basic CALL_DUMMY definitions, see "tm-29k.h." We use the */ /* OBSOLETE same CALL_DUMMY code, but define FIX_CALL_DUMMY (and related macros) */ /* OBSOLETE locally to handle remote debugging of VxWorks targets. The difference */ /* OBSOLETE is in the setting and clearing of the breakpoint at the end of the */ /* OBSOLETE CALL_DUMMY code fragment; under VxWorks, we can't simply insert a */ /* OBSOLETE breakpoint instruction into the code, since that would interfere with */ /* OBSOLETE the breakpoint management mechanism on the target. */ /* OBSOLETE Note that CALL_DUMMY is a piece of code that is used to call any C function */ /* OBSOLETE thru VxGDB */ */ /* OBSOLETE */ /* OBSOLETE /* The offset of the instruction within the CALL_DUMMY code where we */ /* OBSOLETE want the inferior to stop after the function call has completed. */ /* OBSOLETE call_function_by_hand () sets a breakpoint here (via CALL_DUMMY_BREAK_SET), */ /* OBSOLETE which POP_FRAME later deletes (via CALL_DUMMY_BREAK_DELETE). */ */ /* OBSOLETE */ /* OBSOLETE #define CALL_DUMMY_STOP_OFFSET (7 * 4) */ /* OBSOLETE */ /* OBSOLETE /* The offset of the first instruction of the CALL_DUMMY code fragment */ /* OBSOLETE relative to the frame pointer for a dummy frame. This is equal to */ /* OBSOLETE the size of the CALL_DUMMY plus the arg_slop area size (see the diagram */ /* OBSOLETE in "tm-29k.h"). */ */ /* OBSOLETE /* PAD : the arg_slop area size doesn't appear to me to be useful since, the */ /* OBSOLETE call dummy code no longer modify the msp. See below. This must be checked. */ */ /* OBSOLETE */ /* OBSOLETE #define CALL_DUMMY_OFFSET_IN_FRAME (CALL_DUMMY_LENGTH + 16 * 4) */ /* OBSOLETE */ /* OBSOLETE /* Insert the specified number of args and function address */ /* OBSOLETE into a CALL_DUMMY sequence stored at DUMMYNAME, replace the third */ /* OBSOLETE instruction (add msp, msp, 16*4) with a nop, and leave the final nop. */ /* OBSOLETE We can't keep using a CALL_DUMMY that modify the msp since, for VxWorks, */ /* OBSOLETE CALL_DUMMY is stored in the Memory Stack. Adding 16 words to the msp */ /* OBSOLETE would then make possible for the inferior to overwrite the CALL_DUMMY code, */ /* OBSOLETE thus creating a lot of trouble when exiting the inferior to come back in */ /* OBSOLETE a CALL_DUMMY code that no longer exists... Furthermore, ESF are also stored */ /* OBSOLETE from the msp in the memory stack. If msp is set higher than the dummy code, */ /* OBSOLETE an ESF may clobber this code. */ */ /* OBSOLETE */ /* OBSOLETE #if TARGET_BYTE_ORDER == BFD_ENDIAN_BIG */ /* OBSOLETE #define NOP_INSTR 0x70400101 */ /* OBSOLETE #else /* Target is little endian */ */ /* OBSOLETE #define NOP_INSTR 0x01014070 */ /* OBSOLETE #endif */ /* OBSOLETE */ /* OBSOLETE #undef FIX_CALL_DUMMY */ /* OBSOLETE #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ */ /* OBSOLETE { \ */ /* OBSOLETE *(int *)((char *)dummyname + 8) = NOP_INSTR; \ */ /* OBSOLETE STUFF_I16((char *)dummyname + CONST_INSN, fun); \ */ /* OBSOLETE STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16); \ */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE /* For VxWorks, CALL_DUMMY must be stored in the stack of the task that is */ /* OBSOLETE being debugged and executed "in the context of" this task */ */ /* OBSOLETE */ /* OBSOLETE #undef CALL_DUMMY_LOCATION */ /* OBSOLETE #define CALL_DUMMY_LOCATION ON_STACK */ /* OBSOLETE */ /* OBSOLETE /* Set or delete a breakpoint at the location within a CALL_DUMMY code */ /* OBSOLETE fragment where we want the target program to stop after the function */ /* OBSOLETE call is complete. CALL_DUMMY_ADDR is the address of the first */ /* OBSOLETE instruction in the CALL_DUMMY. DUMMY_FRAME_ADDR is the value of the */ /* OBSOLETE frame pointer in the dummy frame. */ /* OBSOLETE */ /* OBSOLETE NOTE: in the both of the following definitions, we take advantage of */ /* OBSOLETE knowledge of the implementation of the target breakpoint operation, */ /* OBSOLETE in that we pass a null pointer as the second argument. It seems */ /* OBSOLETE reasonable to assume that any target requiring the use of */ /* OBSOLETE CALL_DUMMY_BREAK_{SET,DELETE} will not store the breakpoint */ /* OBSOLETE shadow contents in GDB; in any case, this assumption is vaild */ /* OBSOLETE for all VxWorks-related targets. */ */ /* OBSOLETE */ /* OBSOLETE #define CALL_DUMMY_BREAK_SET(call_dummy_addr) \ */ /* OBSOLETE target_insert_breakpoint ((call_dummy_addr) + CALL_DUMMY_STOP_OFFSET, \ */ /* OBSOLETE (char *) 0) */ /* OBSOLETE */ /* OBSOLETE #define CALL_DUMMY_BREAK_DELETE(dummy_frame_addr) \ */ /* OBSOLETE target_remove_breakpoint ((dummy_frame_addr) - (CALL_DUMMY_OFFSET_IN_FRAME \ */ /* OBSOLETE - CALL_DUMMY_STOP_OFFSET), \ */ /* OBSOLETE (char *) 0) */ /* OBSOLETE */ /* OBSOLETE /* Return nonzero if the pc is executing within a CALL_DUMMY frame. */ */ /* OBSOLETE */ /* OBSOLETE #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \ */ /* OBSOLETE ((pc) >= (sp) \ */ /* OBSOLETE && (pc) <= (sp) + CALL_DUMMY_OFFSET_IN_FRAME + CALL_DUMMY_LENGTH) */ /* OBSOLETE */ /* OBSOLETE /* Defining this prevents us from trying to pass a structure-valued argument */ /* OBSOLETE to a function called via the CALL_DUMMY mechanism. This is not handled */ /* OBSOLETE properly in call_function_by_hand (), and the fix might require re-writing */ /* OBSOLETE the CALL_DUMMY handling for all targets (at least, a clean solution */ /* OBSOLETE would probably require this). Arguably, this should go in "tm-29k.h" */ /* OBSOLETE rather than here. */ */ /* OBSOLETE */ /* OBSOLETE #define STRUCT_VAL_ARGS_UNSUPPORTED */ /* OBSOLETE */ /* OBSOLETE #define BKPT_OFFSET (7 * 4) */ /* OBSOLETE #define BKPT_INSTR 0x72500101 */ /* OBSOLETE */ /* OBSOLETE #undef FIX_CALL_DUMMY */ /* OBSOLETE #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ */ /* OBSOLETE {\ */ /* OBSOLETE STUFF_I16((char *)dummyname + CONST_INSN, fun);\ */ /* OBSOLETE STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);\ */ /* OBSOLETE *(int *)((char *)dummyname + BKPT_OFFSET) = BKPT_INSTR;\ */ /* OBSOLETE } */ /* OBSOLETE */ /* OBSOLETE */ /* OBSOLETE /* Offsets into jmp_buf. They are derived from VxWorks' REG_SET struct */ /* OBSOLETE (see VxWorks' setjmp.h). Note that Sun2, Sun3 and SunOS4 and VxWorks have */ /* OBSOLETE different REG_SET structs, hence different layouts for the jmp_buf struct. */ /* OBSOLETE Only JB_PC is needed for getting the saved PC value. */ */ /* OBSOLETE */ /* OBSOLETE #define JB_ELEMENT_SIZE 4 /* size of each element in jmp_buf */ */ /* OBSOLETE #define JB_PC 3 /* offset of pc (pc1) in jmp_buf */ */ /* OBSOLETE */ /* OBSOLETE /* Figure out where the longjmp will land. We expect that we have just entered */ /* OBSOLETE longjmp and haven't yet setup the stack frame, so the args are still in the */ /* OBSOLETE output regs. lr2 (LR2_REGNUM) points at the jmp_buf structure from which we */ /* OBSOLETE extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. */ /* OBSOLETE This routine returns true on success */ */ /* OBSOLETE */ /* OBSOLETE #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR) */ /* OBSOLETE extern int get_longjmp_target (CORE_ADDR *); */ /* OBSOLETE */ /* OBSOLETE /* VxWorks adjusts the PC after a breakpoint has been hit. */ */ /* OBSOLETE */ /* OBSOLETE #undef DECR_PC_AFTER_BREAK */ /* OBSOLETE #define DECR_PC_AFTER_BREAK 0 */ /* OBSOLETE */ /* OBSOLETE /* Do whatever promotions are appropriate on a value being returned */ /* OBSOLETE from a function. VAL is the user-supplied value, and FUNC_TYPE */ /* OBSOLETE is the return type of the function if known, else 0. */ /* OBSOLETE */ /* OBSOLETE For the Am29k, as far as I understand, if the function return type is known, */ /* OBSOLETE cast the value to that type; otherwise, ensure that integer return values */ /* OBSOLETE fill all of gr96. */ /* OBSOLETE */ /* OBSOLETE This definition really belongs in "tm-29k.h", since it applies */ /* OBSOLETE to most Am29K-based systems; but once moved into that file, it might */ /* OBSOLETE need to be redefined for all Am29K-based targets that also redefine */ /* OBSOLETE STORE_RETURN_VALUE. For now, to be safe, we define it here. */ */ /* OBSOLETE */ /* OBSOLETE #define PROMOTE_RETURN_VALUE(val, func_type) \ */ /* OBSOLETE do { \ */ /* OBSOLETE if (func_type) \ */ /* OBSOLETE val = value_cast (func_type, val); \ */ /* OBSOLETE if ((TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT \ */ /* OBSOLETE || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_ENUM) \ */ /* OBSOLETE && TYPE_LENGTH (VALUE_TYPE (val)) < REGISTER_RAW_SIZE (0)) \ */ /* OBSOLETE val = value_cast (builtin_type_int, val); \ */ /* OBSOLETE } while (0) */ /* OBSOLETE */ /* OBSOLETE extern int vx29k_frame_chain_valid (CORE_ADDR, struct frame_info *); */ /* OBSOLETE #define FRAME_CHAIN_VALID(chain, thisframe) vx29k_frame_chain_valid (chain, thisframe) */ /* OBSOLETE */ /* OBSOLETE extern CORE_ADDR frame_saved_call_site (); */ /* OBSOLETE */ /* OBSOLETE #undef PREPARE_TO_INIT_FRAME_INFO */ /* OBSOLETE #define PREPARE_TO_INIT_FRAME_INFO(fci) do { \ */ /* OBSOLETE long current_msp = read_register (MSP_REGNUM); \ */ /* OBSOLETE if (PC_IN_CALL_DUMMY (fci->pc, current_msp, 0)) \ */ /* OBSOLETE { \ */ /* OBSOLETE fci->rsize = DUMMY_FRAME_RSIZE; \ */ /* OBSOLETE fci->msize = 0; \ */ /* OBSOLETE fci->saved_msp = \ */ /* OBSOLETE read_register_stack_integer (fci->frame + DUMMY_FRAME_RSIZE - 4, 4); \ */ /* OBSOLETE fci->flags |= (TRANSPARENT|MFP_USED); \ */ /* OBSOLETE return; \ */ /* OBSOLETE } \ */ /* OBSOLETE } while (0) */