488 lines
15 KiB
C
488 lines
15 KiB
C
/* Definitions to make GDB run on a Sequent Symmetry under dynix 3.0,
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with Weitek 1167 and i387 support.
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Symmetry version by Jay Vosburgh (uunet!sequent!fubar) */
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/* I don't know if this will work for cross-debugging, even if you do get
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a copy of the right include file. */
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#include <machine/reg.h>
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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/* Debugger information will be in DBX format. */
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#define READ_DBX_FORMAT
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/* Offset from address of function to start of its code.
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Zero on most machines. */
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#define FUNCTION_START_OFFSET 0
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. From m-i386.h */
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#define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));}
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/* Immediately after a function call, return the saved pc.
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Can't always go through the frames for this because on some machines
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the new frame is not set up until the new function executes
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some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) \
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read_memory_integer(read_register(SP_REGNUM), 4)
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/* I don't know the real values for these. */
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#define TARGET_UPAGES UPAGES
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#define TARGET_NBPG NBPG
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/* Address of end of stack space. */
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#define STACK_END_ADDR (0x40000000 - (TARGET_UPAGES * TARGET_NBPG))
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/* Stack grows downward. */
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#define INNER_THAN <
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0xcc}
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/* Amount PC must be decremented by after a breakpoint.
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This is often the number of bytes in BREAKPOINT
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but not always. */
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#define DECR_PC_AFTER_BREAK 0
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/* Nonzero if instruction at PC is a return instruction. */
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/* For Symmetry, this is really the 'leave' instruction, which */
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/* is right before the ret */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc9)
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/* Return 1 if P points to an invalid floating point value.
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*/
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#define INVALID_FLOAT(p, len) (0)
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/* code for 80387 fpu. Functions are from i386-dep.c, copied into
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* symm-dep.c.
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*/
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#define FLOAT_INFO { i386_float_info(); }
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/* Say how long (ordinary) registers are. */
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#define REGISTER_TYPE long
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/* Number of machine registers */
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#define NUM_REGS 49
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/* Initializer for an array of names of registers.
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There should be NUM_REGS strings in this initializer. */
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/* Symmetry registers are in this weird order to match the register
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numbers in the symbol table entries. If you change the order,
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things will probably break mysteriously for no apparent reason.
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Also note that the st(0)...st(7) 387 registers are represented as
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st0...st7. */
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#define REGISTER_NAMES { "eax", "edx", "ecx", "st0", "st1", \
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"ebx", "esi", "edi", "st2", "st3", \
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"st4", "st5", "st6", "st7", "esp", \
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"ebp", "eip", "eflags", "fp1", "fp2", \
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"fp3", "fp4", "fp5", "fp6", "fp7", \
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"fp8", "fp9", "fp10", "fp11", "fp12", \
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"fp13", "fp14", "fp15", "fp16", "fp17", \
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"fp18", "fp19", "fp20", "fp21", "fp22", \
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"fp23", "fp24", "fp25", "fp26", "fp27", \
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"fp28", "fp29", "fp30", "fp31" }
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/* Register numbers of various important registers.
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Note that some of these values are "real" register numbers,
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and correspond to the general registers of the machine,
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and some are "phony" register numbers which are too large
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to be actual register numbers as far as the user is concerned
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but do serve to get the desired values when passed to read_register. */
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#define FP1_REGNUM 18 /* first 1167 register */
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#define SP_REGNUM 14 /* Contains address of top of stack */
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#define FP_REGNUM 15 /* Contains address of executing stack frame */
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#define PC_REGNUM 16 /* Contains program counter */
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#define PS_REGNUM 17 /* Contains processor status */
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/* The magic numbers below are offsets into u_ar0 in the user struct.
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* They live in <machine/reg.h>. Gdb calls this macro with blockend
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* holding u.u_ar0 - KERNEL_U_ADDR. Only the registers listed are
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* saved in the u area (along with a few others that aren't useful
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* here. See <machine/reg.h>).
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*/
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#define REGISTER_U_ADDR(addr, blockend, regno) \
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{ struct user foo; /* needed for finding fpu regs */ \
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switch (regno) { \
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case 0: \
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addr = blockend + EAX * sizeof(int); break; \
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case 1: \
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addr = blockend + EDX * sizeof(int); break; \
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case 2: \
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addr = blockend + ECX * sizeof(int); break; \
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case 3: /* st(0) */ \
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addr = blockend - \
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((int)&foo.u_fpusave.fpu_stack[0][0] - (int)&foo); \
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break; \
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case 4: /* st(1) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[1][0] - (int)&foo); \
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break; \
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case 5: \
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addr = blockend + EBX * sizeof(int); break; \
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case 6: \
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addr = blockend + ESI * sizeof(int); break; \
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case 7: \
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addr = blockend + EDI * sizeof(int); break; \
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case 8: /* st(2) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[2][0] - (int)&foo); \
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break; \
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case 9: /* st(3) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[3][0] - (int)&foo); \
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break; \
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case 10: /* st(4) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[4][0] - (int)&foo); \
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break; \
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case 11: /* st(5) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[5][0] - (int)&foo); \
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break; \
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case 12: /* st(6) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[6][0] - (int)&foo); \
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break; \
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case 13: /* st(7) */ \
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addr = blockend - \
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((int) &foo.u_fpusave.fpu_stack[7][0] - (int)&foo); \
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break; \
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case 14: \
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addr = blockend + ESP * sizeof(int); break; \
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case 15: \
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addr = blockend + EBP * sizeof(int); break; \
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case 16: \
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addr = blockend + EIP * sizeof(int); break; \
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case 17: \
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addr = blockend + FLAGS * sizeof(int); break; \
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case 18: /* fp1 */ \
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case 19: /* fp2 */ \
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case 20: /* fp3 */ \
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case 21: /* fp4 */ \
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case 22: /* fp5 */ \
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case 23: /* fp6 */ \
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case 24: /* fp7 */ \
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case 25: /* fp8 */ \
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case 26: /* fp9 */ \
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case 27: /* fp10 */ \
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case 28: /* fp11 */ \
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case 29: /* fp12 */ \
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case 30: /* fp13 */ \
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case 31: /* fp14 */ \
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case 32: /* fp15 */ \
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case 33: /* fp16 */ \
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case 34: /* fp17 */ \
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case 35: /* fp18 */ \
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case 36: /* fp19 */ \
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case 37: /* fp20 */ \
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case 38: /* fp21 */ \
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case 39: /* fp22 */ \
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case 40: /* fp23 */ \
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case 41: /* fp24 */ \
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case 42: /* fp25 */ \
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case 43: /* fp26 */ \
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case 44: /* fp27 */ \
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case 45: /* fp28 */ \
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case 46: /* fp29 */ \
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case 47: /* fp30 */ \
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case 48: /* fp31 */ \
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addr = blockend - \
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((int) &foo.u_fpasave.fpa_regs[(regno)-18] - (int)&foo); \
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} \
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}
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/* Total amount of space needed to store our copies of the machine's
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register state, the array `registers'. */
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/* 10 i386 registers, 8 i387 registers, and 31 Weitek 1167 registers */
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#define REGISTER_BYTES ((10 * 4) + (8 * 10) + (31 * 4))
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) \
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((N < 3) ? (N * 4) : \
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(N < 5) ? (((N - 2) * 10) + 2) : \
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(N < 8) ? (((N - 5) * 4) + 32) : \
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(N < 14) ? (((N - 8) * 10) + 44) : \
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(((N - 14) * 4) + 104))
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/* Number of bytes of storage in the actual machine representation
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* for register N. All registers are 4 bytes, except 387 st(0) - st(7),
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* which are 80 bits each.
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*/
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#define REGISTER_RAW_SIZE(N) \
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((N < 3) ? 4 : \
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(N < 5) ? 10 : \
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(N < 8) ? 4 : \
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(N < 14) ? 10 : \
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4)
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/* Number of bytes of storage in the program's representation
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for register N. On the vax, all regs are 4 bytes. */
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#define REGISTER_VIRTUAL_SIZE(N) 4
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 10
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 4
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/* Nonzero if register N requires conversion
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from raw format to virtual format. */
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#define REGISTER_CONVERTIBLE(N) \
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((N < 3) ? 0 : \
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(N < 5) ? 1 : \
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(N < 8) ? 0 : \
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(N < 14) ? 1 : \
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0)
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/* Convert data from raw format for register REGNUM
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to virtual format for register REGNUM. */
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
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((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
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(REGNUM < 5) ? i387_to_double((FROM), (TO)) : \
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(REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
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(REGNUM < 14) ? i387_to_double((FROM), (TO)) : \
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bcopy ((FROM), (TO), 4))
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/* Convert data from virtual format for register REGNUM
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to raw format for register REGNUM. */
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#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
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((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
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(REGNUM < 5) ? double_to_i387((FROM), (TO)) : \
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(REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
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(REGNUM < 14) ? double_to_i387((FROM), (TO)) : \
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bcopy ((FROM), (TO), 4))
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#define REGISTER_VIRTUAL_TYPE(N) \
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((N < 3) ? builtin_type_int : \
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(N < 5) ? builtin_type_double : \
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(N < 8) ? builtin_type_int : \
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(N < 14) ? builtin_type_double : \
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builtin_type_int)
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/* from m-i386.h */
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/* Store the address of the place in which to copy the structure the
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subroutine will return. This is called from call_function. */
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#define STORE_STRUCT_RETURN(ADDR, SP) \
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{ (SP) -= sizeof (ADDR); \
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write_memory ((SP), &(ADDR), sizeof (ADDR)); \
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write_register(0, (ADDR)); }
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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symmetry_extract_return_value(TYPE, REGBUF, VALBUF)
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
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/* Extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR (or an expression that can be used as one). */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
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/* Describe the pointer in each stack frame to the previous stack frame
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer.
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FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
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and produces the nominal address of the caller frame.
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However, if FRAME_CHAIN_VALID returns zero,
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it means the given frame is the outermost one and has no caller.
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In that case, FRAME_CHAIN_COMBINE is not used. */
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/* On Symmetry, %ebp points to caller's %ebp, and the return address
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is right on top of that.
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*/
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#define FRAME_CHAIN(thisframe) \
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(outside_startup_file ((thisframe)->pc) ? \
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read_memory_integer((thisframe)->frame, 4) :\
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0)
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#define FRAME_CHAIN_VALID(chain, thisframe) \
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(chain != 0)
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#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
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/* Define other aspects of the stack frame. */
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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(FRAMELESS) = frameless_look_for_prologue(FI)
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#define FRAME_SAVED_PC(fi) (read_memory_integer((fi)->frame + 4, 4))
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell.
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The weirdness in the "addl $imm8" case is due to gcc sometimes
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issuing "addl $-int" after function call returns; this would
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produce ridiculously huge arg counts. */
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#define FRAME_NUM_ARGS(numargs, fi) \
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{ \
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int op = read_memory_integer(FRAME_SAVED_PC((fi)), 4); \
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int narg; \
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if ((op & 0xff) == 0x59) /* 0x59 'popl %ecx' */ \
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{ \
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numargs = 1; \
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} \
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else if ((op & 0xffff) == 0xc483) /* 0xc483 'addl $imm8' */ \
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{ \
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narg = ((op >> 16) & 0xff); \
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numargs = (narg >= 128) ? -1 : narg / 4; \
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} \
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else if ((op & 0xffff) == 0xc481) /* 0xc481 'addl $imm32' */ \
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{ \
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narg = read_memory_integer(FRAME_SAVED_PC((fi))+2,4); \
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numargs = (narg < 0) ? -1 : narg / 4; \
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} \
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else \
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{ \
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numargs = -1; \
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} \
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}
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 8
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
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{ i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
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/* Things needed for making the inferior call functions. */
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#define PUSH_DUMMY_FRAME \
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{ CORE_ADDR sp = read_register (SP_REGNUM); \
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int regnum; \
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sp = push_word (sp, read_register (PC_REGNUM)); \
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sp = push_word (sp, read_register (FP_REGNUM)); \
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write_register (FP_REGNUM, sp); \
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for (regnum = 0; regnum < NUM_REGS; regnum++) \
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sp = push_word (sp, read_register (regnum)); \
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write_register (SP_REGNUM, sp); \
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}
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#define POP_FRAME \
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{ \
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FRAME frame = get_current_frame (); \
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CORE_ADDR fp; \
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int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info *fi; \
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fi = get_frame_info (frame); \
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fp = fi->frame; \
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get_frame_saved_regs (fi, &fsr); \
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for (regnum = 0; regnum < NUM_REGS; regnum++) { \
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CORE_ADDR adr; \
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adr = fsr.regs[regnum]; \
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if (adr) \
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write_register (regnum, read_memory_integer (adr, 4)); \
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} \
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write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
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write_register (SP_REGNUM, fp + 8); \
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flush_cached_frames (); \
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set_current_frame ( create_new_frame (read_register (FP_REGNUM), \
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read_pc ())); \
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}
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/* from i386-dep.c, worked better than my original... */
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/* This sequence of words is the instructions
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* call (32-bit offset)
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* int 3
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* This is 6 bytes.
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*/
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#define CALL_DUMMY { 0x223344e8, 0xcc11 }
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#define CALL_DUMMY_LENGTH 8
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#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
|
||
|
||
/* 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) \
|
||
{ \
|
||
int from, to, delta, loc; \
|
||
loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
|
||
from = loc + 5; \
|
||
to = (int)(fun); \
|
||
delta = to - from; \
|
||
*(int *)((char *)(dummyname) + 1) = delta; \
|
||
}
|