413 lines
15 KiB
C
413 lines
15 KiB
C
/* Parameters for targe of a Gould Powernode, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define GOULD_PN
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#define TARGET_BYTE_ORDER BIG_ENDIAN
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/* This code appears in libraries on Gould machines. Ignore it. */
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#define IGNORE_SYMBOL(type) (type == N_ENTRY)
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/* We don't want the extra gnu symbols on the machine;
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they will interfere with the shared segment symbols. */
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#define NO_GNU_STABS
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/* Macro for text-offset and data info (in PN a.out format). */
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#define TEXTINFO \
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text_offset = N_TXTOFF (exec_coffhdr); \
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exec_data_offset = N_TXTOFF (exec_coffhdr) \
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+ exec_aouthdr.a_text
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/* Macro for number of symbol table entries (this used to be checked
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in dbxread.c and caused the last psymtab to use this as the end of
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text. I'm not sure whether it would still be necessary). */
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#define END_OF_TEXT_DEFAULT \
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(0xffffff)
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/* Macro for number of symbol table entries */
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#define NUMBER_OF_SYMBOLS \
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(coffhdr.f_nsyms)
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/* Macro for file-offset of symbol table (in usual a.out format). */
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#define SYMBOL_TABLE_OFFSET \
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N_SYMOFF (coffhdr)
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/* Macro for file-offset of string table (in usual a.out format). */
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#define STRING_TABLE_OFFSET \
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(N_STROFF (coffhdr) + sizeof(int))
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/* Macro to store the length of the string table data in INTO. */
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#define READ_STRING_TABLE_SIZE(INTO) \
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{ INTO = hdr.a_stsize; }
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/* Macro to declare variables to hold the file's header data. */
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#define DECLARE_FILE_HEADERS struct old_exec hdr; \
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FILHDR coffhdr
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/* Macro to read the header data from descriptor DESC and validate it.
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NAME is the file name, for error messages. */
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#define READ_FILE_HEADERS(DESC, NAME) \
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{ val = myread (DESC, &coffhdr, sizeof coffhdr); \
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if (val < 0) \
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perror_with_name (NAME); \
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val = myread (DESC, &hdr, sizeof hdr); \
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if (val < 0) \
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perror_with_name (NAME); \
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if (coffhdr.f_magic != GNP1MAGIC) \
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error ("File \"%s\" not in coff executable format.", NAME); \
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if (N_BADMAG (hdr)) \
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error ("File \"%s\" not in executable format.", NAME); }
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/* Define COFF and other symbolic names needed on NP1 */
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#define NS32GMAGIC GDPMAGIC
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#define NS32SMAGIC PN_MAGIC
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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 4
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. One PN we can have one or two startup
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sequences depending on the size of the local stack:
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Either:
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"suabr b2, #"
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of
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"lil r4, #", "suabr b2, #(r4)"
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"lwbr b6, #", "stw r1, 8(b2)"
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Optional "stwbr b3, c(b2)"
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Optional "trr r2,r7" (Gould first argument register passing)
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or
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Optional "stw r2,8(b3)" (Gould first argument register passing)
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*/
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#define SKIP_PROLOGUE(pc) { \
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register int op = read_memory_integer ((pc), 4); \
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if ((op & 0xffff0000) == 0x580B0000) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if ((op & 0xffff0000) == 0x59400000) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if ((op & 0xffff0000) == 0x5F000000) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if (op == 0xD4820008) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if (op == 0x5582000C) { \
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pc += 4; \
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op = read_memory_integer ((pc), 2); \
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if (op == 0x2fa0) { \
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pc += 2; \
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} else { \
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op = read_memory_integer ((pc), 4); \
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if (op == 0xd5030008) { \
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pc += 4; \
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} \
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} \
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} else { \
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op = read_memory_integer ((pc), 2); \
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if (op == 0x2fa0) { \
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pc += 2; \
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} \
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} \
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} \
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} \
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} \
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} \
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if ((op & 0xffff0000) == 0x59000000) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if ((op & 0xffff0000) == 0x5F000000) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if (op == 0xD4820008) { \
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pc += 4; \
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op = read_memory_integer ((pc), 4); \
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if (op == 0x5582000C) { \
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pc += 4; \
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op = read_memory_integer ((pc), 2); \
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if (op == 0x2fa0) { \
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pc += 2; \
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} else { \
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op = read_memory_integer ((pc), 4); \
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if (op == 0xd5030008) { \
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pc += 4; \
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} \
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} \
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} else { \
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op = read_memory_integer ((pc), 2); \
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if (op == 0x2fa0) { \
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pc += 2; \
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} \
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} \
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} \
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} \
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} \
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}
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/* Immediately after a function call, return the saved pc.
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Can't 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. True on PN! Return address is in R1.
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Note: true return location is 4 bytes past R1! */
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#define SAVED_PC_AFTER_CALL(frame) \
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(read_register(R1_REGNUM) + 4)
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/* Address of end of stack space. */
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#define STACK_END_ADDR 0x480000
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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 {0x28, 0x09}
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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 2
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/* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0xEC100004)
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/* Return 1 if P points to an invalid floating point value. */
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#define INVALID_FLOAT(p, len) ((*(short *)p & 0xff80) == 0x8000)
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/* Say how long (ordinary) registers are. This is a piece of bogosity
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used in push_word and a few other places; REGISTER_RAW_SIZE is the
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real way to know how big a register is. */
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#define REGISTER_SIZE 4
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/* Number of machine registers */
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#define NUM_REGS 19
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#define NUM_GEN_REGS 16
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#define NUM_CPU_REGS 3
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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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#define REGISTER_NAMES { \
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
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"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \
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"sp", "ps", "pc", \
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}
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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 R1_REGNUM 1 /* Gr1 => return address of caller */
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#define R4_REGNUM 4 /* Gr4 => register save area */
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#define R5_REGNUM 5 /* Gr5 => register save area */
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#define R6_REGNUM 6 /* Gr6 => register save area */
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#define R7_REGNUM 7 /* Gr7 => register save area */
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#define B1_REGNUM 9 /* Br1 => start of this code routine */
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#define FP_REGNUM 10 /* Br2 == (sp) */
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#define AP_REGNUM 11 /* Br3 == (ap) */
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#define SP_REGNUM 16 /* A copy of Br2 saved in trap */
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#define PS_REGNUM 17 /* Contains processor status */
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#define PC_REGNUM 18 /* Contains program counter */
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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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#define REGISTER_BYTES (NUM_GEN_REGS*4 + NUM_CPU_REGS*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) ((N) * 4)
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/* Number of bytes of storage in the actual machine representation
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for register N. On the PN, all normal regs are 4 bytes. */
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#define REGISTER_RAW_SIZE(N) (4)
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/* Number of bytes of storage in the program's representation
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for register N. On the PN, 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 (4)
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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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/* 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) (builtin_type_int)
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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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On this machine this is a no-op, because gcc isn't used on it
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yet. So this calling convention is not used. */
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#define STORE_STRUCT_RETURN(ADDR, SP)
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/* Extract from an arrary 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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memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
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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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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 the case of the NPL, the frame's norminal address is Br2 and the
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previous routines frame is up the stack X bytes, where X is the
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value stored in the code function header xA(Br1). */
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#define FRAME_CHAIN(thisframe) (findframe(thisframe))
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#define FRAME_CHAIN_VALID(chain, thisframe) \
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(chain != 0 && chain != (thisframe)->frame)
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/* Define other aspects of the stack frame on NPL. */
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#define FRAME_SAVED_PC(frame) \
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(read_memory_integer ((frame)->frame + 8, 4))
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#define FRAME_ARGS_ADDRESS(fi) \
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((fi)->next ? \
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read_memory_integer ((fi)->frame + 12, 4) : \
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read_register (AP_REGNUM))
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame + 80)
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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can check the stab info to see how
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many arg we have. No info in stack will tell us */
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#define FRAME_NUM_ARGS(val,fi) (val = findarg(fi))
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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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{ \
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memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
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(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 8; \
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(frame_saved_regs).regs[R4_REGNUM] = (frame_info)->frame + 0x30; \
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(frame_saved_regs).regs[R5_REGNUM] = (frame_info)->frame + 0x34; \
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(frame_saved_regs).regs[R6_REGNUM] = (frame_info)->frame + 0x38; \
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(frame_saved_regs).regs[R7_REGNUM] = (frame_info)->frame + 0x3C; \
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}
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME \
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{ register CORE_ADDR sp = read_register (SP_REGNUM); \
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register 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 = FP_REGNUM - 1; regnum >= 0; regnum--) \
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sp = push_word (sp, read_register (regnum)); \
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sp = push_word (sp, read_register (PS_REGNUM)); \
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write_register (SP_REGNUM, sp); }
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/* Discard from the stack the innermost frame,
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restoring all saved registers. */
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#define POP_FRAME \
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{ register struct frame_info *frame = get_current_frame (); \
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register CORE_ADDR fp; \
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register int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info *fi; \
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fp = frame->frame; \
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get_frame_saved_regs (frame, &fsr); \
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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if (fsr.regs[regnum]) \
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
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if (fsr.regs[PS_REGNUM]) \
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write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
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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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}
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/* This sequence of words is the instructions:
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halt
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halt
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halt
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halt
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suabr b2, #<stacksize>
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lwbr b6, #con
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stw r1, 8(b2) - save caller address, do we care?
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lw r2, 60(b2) - arg1
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labr b3, 50(b2)
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std r4, 30(b2) - save r4-r7
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std r6, 38(b2)
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lwbr b1, #<func> - load function call address
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brlnk r1, 8(b1) - call function
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halt
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halt
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ld r4, 30(b2) - restore r4-r7
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ld r6, 38(b2)
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Setup our stack frame, load argumemts, call and then restore registers.
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*/
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/* FIXME: The below defines an m68k CALL_DUMMY, which looks nothing like what
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is documented above. */
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#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
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#define CALL_DUMMY_LENGTH 28
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#define CALL_DUMMY_START_OFFSET 12
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ *(int *)((char *) dummyname + 20) = nargs * 4; \
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*(int *)((char *) dummyname + 14) = fun; }
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