507 lines
19 KiB
C
507 lines
19 KiB
C
/* Parameters for targeting on a Gould NP1, for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define GOULD_NPL
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#define TARGET_BYTE_ORDER BIG_ENDIAN
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/* N_ENTRY appears in libraries on Gould machines.
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Don't know what 0xa4 is; it's mentioned in stab.h
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but only in the sdb symbol list. */
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#define IGNORE_SYMBOL(type) (type == N_ENTRY || type == 0xa4)
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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 NPL a.out format). */
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#define TEXTINFO \
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text_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr); \
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exec_data_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr)\
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+ exec_aouthdr.a_text
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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 NPL 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 NPL a.out format). */
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#define STRING_TABLE_OFFSET \
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(N_STROFF (coffhdr))
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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 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 GNP1MAGIC
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#define NS32SMAGIC GPNMAGIC
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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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/* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
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not relative to start of source address. */
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#define BLOCK_ADDRESS_ABSOLUTE
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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 8
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. One NPL we can have one 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) == 0xFA0B0000) { \
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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 NPL! Return address is in R1.
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The true return address is REALLY 4 past that location! */
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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 0x7fffc000
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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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This is padded out to the size of a machine word. When it was just
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{0x28, 0x09} it gave problems if hit breakpoint on returning from a
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function call. */
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#define BREAKPOINT {0x28, 0x09, 0x0, 0x0}
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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) == 0x40100004)
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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. */
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#define REGISTER_TYPE long
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/* Size of bytes of vector register (NP1 only), 32 elements * sizeof(int) */
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#define VR_SIZE 128
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/* Number of machine registers */
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#define NUM_REGS 27
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#define NUM_GEN_REGS 16
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#define NUM_CPU_REGS 4
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#define NUM_VECTOR_REGS 7
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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", "ve", \
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"v1", "v2", "v3", "v4", "v5", "v6", "v7", \
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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 R2_REGNUM 2 /* Gr2 => return value from function */
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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 SP_REGNUM 10 /* Br2 == (sp) */
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#define AP_REGNUM 11 /* Br3 == (ap) */
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#define FP_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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#define VE_REGNUM 19 /* Vector end (user setup) register */
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#define V1_REGNUM 20 /* First vector register */
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#define V7_REGNUM 26 /* First vector register */
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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 \
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(NUM_GEN_REGS*4 + NUM_VECTOR_REGS*VR_SIZE + 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) \
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(((N) < V1_REGNUM) ? ((N) * 4) : (((N) - V1_REGNUM) * VR_SIZE) + 80)
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/* Number of bytes of storage in the actual machine representation
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for register N. On the NP1, all normal regs are 4 bytes, but
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the vector registers are VR_SIZE*4 bytes long. */
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#define REGISTER_RAW_SIZE(N) \
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(((N) < V1_REGNUM) ? 4 : VR_SIZE)
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/* Number of bytes of storage in the program's representation
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for register N. On the NP1, all regs are 4 bytes. */
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#define REGISTER_VIRTUAL_SIZE(N) \
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(((N) < V1_REGNUM) ? 4 : VR_SIZE)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE VR_SIZE
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE VR_SIZE
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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) (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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bcopy ((FROM), (TO), REGISTER_RAW_SIZE(REGNUM));
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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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bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
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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) > VE_REGNUM ? builtin_type_np1_vector : builtin_type_int)
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extern struct type *builtin_type_np1_vector;
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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) push_word(SP + 8, ADDR)
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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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bcopy (((int *)(REGBUF)) + 2, VALBUF, 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 (REGISTER_BYTE (R2_REGNUM), VALBUF, \
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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) + 2))
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/* Both gcc and cc return small structs in registers (i.e. in GDB
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terminology, small structs don't use the struct return convention). */
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#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH(type) > 8)
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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_frame ? \
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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)
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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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bzero (&frame_saved_regs, sizeof frame_saved_regs); \
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(frame_saved_regs).regs[SP_REGNUM] = framechain (frame_info); \
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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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#define CALL_DUMMY_LOCATION BEFORE_TEXT_END
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#define NEED_TEXT_START_END
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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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for (regnum = 0; regnum < FP_REGNUM; 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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sp = push_word (sp, read_register (PC_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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{ CORE_ADDR sp = read_register(SP_REGNUM); \
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REGISTER_TYPE reg; \
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int regnum; \
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for(regnum = 0;regnum < FP_REGNUM;regnum++){ \
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sp-=sizeof(REGISTER_TYPE); \
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read_memory(sp,®,sizeof(REGISTER_TYPE)); \
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write_register(regnum,reg);} \
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sp-=sizeof(REGISTER_TYPE); \
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read_memory(sp,®,sizeof(REGISTER_TYPE)); \
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write_register(PS_REGNUM,reg); \
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sp-=sizeof(REGISTER_TYPE); \
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read_memory(sp,®,sizeof(REGISTER_TYPE)); \
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write_register(PC_REGNUM,reg);}
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/* MJD - Size of dummy frame pushed onto stack by PUSH_DUMMY_FRAME */
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#define DUMMY_FRAME_SIZE (0x48)
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/* MJD - The sequence of words in the instructions is
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halt
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halt
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halt
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halt
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subr b2,stack size,0 grab stack space for dummy call
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labr b3,x0(b2),0 set AP_REGNUM to point at arguments
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lw r2,x8(b3),0 load r2 with first argument
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lwbr b1,arguments size(b2),0 load address of function to be called
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brlnk r1,x8(b1),0 call function
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halt
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halt
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labr b2,stack size(b2),0 give back stack
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break break
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*/
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#define CALL_DUMMY {0x00000000, \
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0x00000000, \
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0x59000000, \
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0x598a0000, \
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0xb5030008, \
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0x5c820000, \
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0x44810008, \
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0x00000000, \
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0x590a0000, \
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0x28090000 }
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#define CALL_DUMMY_LENGTH 40
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#define CALL_DUMMY_START_OFFSET 8
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#define CALL_DUMMY_STACK_ADJUST 8
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/* MJD - Fixup CALL_DUMMY for the specific function call.
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OK heres the problems
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1) On a trap there are two copies of the stack pointer, one in SP_REGNUM
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which is read/write and one in FP_REGNUM which is only read. It seems
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that when restarting the GOULD NP1 uses FP_REGNUM's value.
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2) Loading function address into b1 looks a bit difficult if bigger than
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0x0000fffc, infact from what I can tell the compiler sets up table of
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function address in base3 through which function calls are referenced.
|
||
|
||
OK my solutions
|
||
Calculate the size of the dummy stack frame and do adjustments of
|
||
SP_REGNUM in the dummy call.
|
||
Push function address onto the stack and load it in the dummy call
|
||
*/
|
||
|
||
#define FIX_CALL_DUMMY(dummyname, sp, fun, nargs, args, type, gcc_p) \
|
||
{ int i;\
|
||
int arg_len = 0, total_len;\
|
||
old_sp = push_word(old_sp,fun);\
|
||
for(i = nargs - 1;i >= 0;i--)\
|
||
arg_len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));\
|
||
if(struct_return)\
|
||
arg_len += TYPE_LENGTH(value_type);\
|
||
total_len = DUMMY_FRAME_SIZE+CALL_DUMMY_STACK_ADJUST+4+arg_len;\
|
||
dummyname[0] += total_len;\
|
||
dummyname[2] += total_len;\
|
||
dummyname[5] += arg_len+CALL_DUMMY_STACK_ADJUST;\
|
||
dummyname[8] += total_len;}
|
||
|
||
/* MJD - So the stack should end up looking like this
|
||
|
||
| Normal stack frame |
|
||
| from normal program |
|
||
| flow |
|
||
+---------------------+ <- Final sp - 0x08 - argument size
|
||
| | - 0x4 - dummy_frame_size
|
||
| Pushed dummy frame |
|
||
| b0-b7, r0-r7 |
|
||
| pc and ps |
|
||
| |
|
||
+---------------------+
|
||
| Function address |
|
||
+---------------------+ <- Final sp - 0x8 - arguments size
|
||
| |
|
||
| |
|
||
| |
|
||
| Arguments to |
|
||
| Function |
|
||
| |
|
||
| |
|
||
| |
|
||
+---------------------+ <- Final sp - 0x8
|
||
| Dummy_stack_adjust |
|
||
+---------------------+ <- Final sp
|
||
| |
|
||
| where call will |
|
||
| build frame |
|
||
*/
|