-/* Print NS 32000 instructions for GDB, the GNU debugger.
- Copyright 1986, 1988, 1991, 1992, 1994, 1995
- Free Software Foundation, Inc.
+/* Target dependent code for the NS32000, for GDB.
+
+ Copyright 1986, 1988, 1991, 1992, 1994, 1995, 1998, 1999, 2000,
+ 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#include "defs.h"
+#include "frame.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "target.h"
+#include "arch-utils.h"
+#include "osabi.h"
+#include "dis-asm.h"
+
+#include "ns32k-tdep.h"
+#include "gdb_string.h"
+
+static int sign_extend (int value, int bits);
+static CORE_ADDR ns32k_get_enter_addr (CORE_ADDR);
+static int ns32k_localcount (CORE_ADDR enter_pc);
+static void flip_bytes (void *, int);
+
+static const char *
+ns32k_register_name_32082 (int regno)
+{
+ static char *register_names[] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "sp", "fp", "pc", "ps",
+ "l0", "l1", "l2", "l3", "xx",
+ };
+
+ if (regno < 0)
+ return NULL;
+ if (regno >= sizeof (register_names) / sizeof (*register_names))
+ return NULL;
+
+ return (register_names[regno]);
+}
-void
-_initialize_ns32k_tdep ()
+static const char *
+ns32k_register_name_32382 (int regno)
{
- tm_print_insn = print_insn_ns32k;
+ static char *register_names[] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "sp", "fp", "pc", "ps",
+ "fsr",
+ "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", "xx",
+ };
+
+ if (regno < 0)
+ return NULL;
+ if (regno >= sizeof (register_names) / sizeof (*register_names))
+ return NULL;
+
+ return (register_names[regno]);
}
-/* Advance PC across any function entry prologue instructions
- to reach some "real" code. */
+static int
+ns32k_register_byte_32082 (int regno)
+{
+ if (regno >= NS32K_LP0_REGNUM)
+ return (NS32K_LP0_REGNUM * 4) + ((regno - NS32K_LP0_REGNUM) * 8);
+
+ return (regno * 4);
+}
-CORE_ADDR
-merlin_skip_prologue (pc)
- CORE_ADDR pc;
+static int
+ns32k_register_byte_32382 (int regno)
{
- register int op = read_memory_integer (pc, 1);
- if (op == 0x82)
- {
- op = read_memory_integer (pc + 2, 1);
- if ((op & 0x80) == 0)
- pc += 3;
- else if ((op & 0xc0) == 0x80)
- pc += 4;
- else
- pc += 6;
- }
- return pc;
+ /* This is a bit yuk. The even numbered double precision floating
+ point long registers occupy the same space as the even:odd numbered
+ single precision floating point registers, but the extra 32381 FPU
+ registers are at the end. Doing it this way is compatible for both
+ 32081 and 32381 equipped machines. */
+
+ return ((regno < NS32K_LP0_REGNUM ? regno
+ : (regno - NS32K_LP0_REGNUM) & 1 ? regno - 1
+ : (regno - NS32K_LP0_REGNUM + FP0_REGNUM)) * 4);
+}
+
+static int
+ns32k_register_raw_size (int regno)
+{
+ /* All registers are 4 bytes, except for the doubled floating
+ registers. */
+
+ return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
+}
+
+static int
+ns32k_register_virtual_size (int regno)
+{
+ return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
+}
+
+static struct type *
+ns32k_register_virtual_type (int regno)
+{
+ if (regno < FP0_REGNUM)
+ return (builtin_type_int);
+
+ if (regno < FP0_REGNUM + 8)
+ return (builtin_type_float);
+
+ if (regno < NS32K_LP0_REGNUM)
+ return (builtin_type_int);
+
+ return (builtin_type_double);
+}
+
+/* Immediately after a function call, return the saved PC. Can't
+ always go through the frames for this because on some systems,
+ the new frame is not set up until the new function executes some
+ instructions. */
+
+static CORE_ADDR
+ns32k_saved_pc_after_call (struct frame_info *frame)
+{
+ return (read_memory_integer (read_register (SP_REGNUM), 4));
}
-CORE_ADDR
-umax_skip_prologue (pc)
- CORE_ADDR pc;
+/* Advance PC across any function entry prologue instructions
+ to reach some "real" code. */
+
+static CORE_ADDR
+umax_skip_prologue (CORE_ADDR pc)
{
- register unsigned char op = read_memory_integer (pc, 1);
+ unsigned char op = read_memory_integer (pc, 1);
if (op == 0x82)
{
op = read_memory_integer (pc + 2, 1);
}
return pc;
}
-
-/* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
-
-int
-merlin_frame_num_args (fi)
- struct frame_info *fi;
+\f
+static const unsigned char *
+ns32k_breakpoint_from_pc (CORE_ADDR *pcp, int *lenp)
{
- int numargs;
- CORE_ADDR pc;
- int insn;
- int addr_mode;
- int width;
+ static const unsigned char breakpoint_insn[] = { 0xf2 };
- pc = FRAME_SAVED_PC (fi);
- insn = read_memory_integer (pc, 2);
- addr_mode = (insn >> 11) & 0x1f;
- insn = insn & 0x7ff;
- if ((insn & 0x7fc) == 0x57c
- && addr_mode == 0x14) /* immediate */
- {
- if (insn == 0x57c) /* adjspb */
- width = 1;
- else if (insn == 0x57d) /* adjspw */
- width = 2;
- else if (insn == 0x57f) /* adjspd */
- width = 4;
- numargs = read_memory_integer (pc + 2, width);
- if (width > 1)
- flip_bytes (&numargs, width);
- numargs = -sign_extend (numargs, width * 8) / 4;
- }
- else
- numargs = -1;
- return numargs;
+ *lenp = sizeof (breakpoint_insn);
+ return breakpoint_insn;
}
-
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell.
Encore's C compiler often reuses same area on stack for args,
so this will often not work properly. If the arg names
are known, it's likely most of them will be printed. */
-int
-umax_frame_num_args (fi)
- struct frame_info *fi;
+
+static int
+umax_frame_num_args (struct frame_info *fi)
{
int numargs;
CORE_ADDR pc;
int width;
numargs = -1;
- enter_addr = ns32k_get_enter_addr ((fi)->pc);
+ enter_addr = ns32k_get_enter_addr (get_frame_pc (fi));
if (enter_addr > 0)
{
pc = ((enter_addr == 1)
- ? SAVED_PC_AFTER_CALL (fi)
- : FRAME_SAVED_PC (fi));
+ ? DEPRECATED_SAVED_PC_AFTER_CALL (fi)
+ : DEPRECATED_FRAME_SAVED_PC (fi));
insn = read_memory_integer (pc, 2);
addr_mode = (insn >> 11) & 0x1f;
insn = insn & 0x7ff;
width = 2;
else if (insn == 0x57f) /* adjspd */
width = 4;
+ else
+ internal_error (__FILE__, __LINE__, "bad else");
numargs = read_memory_integer (pc + 2, width);
if (width > 1)
flip_bytes (&numargs, width);
return numargs;
}
-
-sign_extend (value, bits)
+static int
+sign_extend (int value, int bits)
{
value = value & ((1 << bits) - 1);
return (value & (1 << (bits - 1))
: value);
}
-void
-flip_bytes (ptr, count)
- char *ptr;
- int count;
+static void
+flip_bytes (void *p, int count)
{
char tmp;
+ char *ptr = 0;
while (count > 0)
{
}
}
-/* Return the number of locals in the current frame given a pc
- pointing to the enter instruction. This is used in the macro
- FRAME_FIND_SAVED_REGS. */
+/* Return the number of locals in the current frame given a
+ pc pointing to the enter instruction. This is used by
+ ns32k_frame_init_saved_regs. */
-int
-ns32k_localcount (enter_pc)
- CORE_ADDR enter_pc;
+static int
+ns32k_localcount (CORE_ADDR enter_pc)
{
unsigned char localtype;
int localcount;
/* Nonzero if instruction at PC is a return instruction. */
static int
-ns32k_about_to_return (pc)
- CORE_ADDR pc;
+ns32k_about_to_return (CORE_ADDR pc)
{
return (read_memory_integer (pc, 1) == 0x12);
}
-
-/*
- * Get the address of the enter opcode for the function
- * containing PC, if there is an enter for the function,
- * and if the pc is between the enter and exit.
- * Returns positive address if pc is between enter/exit,
- * 1 if pc before enter or after exit, 0 otherwise.
- */
-
-CORE_ADDR
-ns32k_get_enter_addr (pc)
- CORE_ADDR pc;
+/* Get the address of the enter opcode for this function, if it is active.
+ Returns positive address > 1 if pc is between enter/exit,
+ 1 if pc before enter or after exit, 0 otherwise. */
+static CORE_ADDR
+ns32k_get_enter_addr (CORE_ADDR pc)
{
CORE_ADDR enter_addr;
unsigned char op;
return enter_addr; /* pc is between enter and exit */
}
+
+static CORE_ADDR
+ns32k_frame_chain (struct frame_info *frame)
+{
+ /* In the case of the NS32000 series, the frame's nominal address is the
+ FP value, and that address is saved at the previous FP value as a
+ 4-byte word. */
+ return (read_memory_integer (get_frame_base (frame), 4));
+}
+
+
+static CORE_ADDR
+ns32k_sigtramp_saved_pc (struct frame_info *frame)
+{
+ CORE_ADDR sigcontext_addr;
+ char *buf;
+ int ptrbytes = TYPE_LENGTH (builtin_type_void_func_ptr);
+ int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
+
+ buf = alloca (ptrbytes);
+ /* Get sigcontext address, it is the third parameter on the stack. */
+ if (get_next_frame (frame))
+ sigcontext_addr = read_memory_typed_address
+ (DEPRECATED_FRAME_ARGS_ADDRESS (get_next_frame (frame)) + FRAME_ARGS_SKIP + sigcontext_offs,
+ builtin_type_void_data_ptr);
+ else
+ sigcontext_addr = read_memory_typed_address
+ (read_register (SP_REGNUM) + sigcontext_offs, builtin_type_void_data_ptr);
+
+ /* Offset to saved PC in sigcontext, from <machine/signal.h>. Don't
+ cause a memory_error when accessing sigcontext in case the stack
+ layout has changed or the stack is corrupt. */
+ target_read_memory (sigcontext_addr + 20, buf, ptrbytes);
+ return extract_typed_address (buf, builtin_type_void_func_ptr);
+}
+
+static CORE_ADDR
+ns32k_frame_saved_pc (struct frame_info *frame)
+{
+ if ((get_frame_type (frame) == SIGTRAMP_FRAME))
+ return (ns32k_sigtramp_saved_pc (frame)); /* XXXJRT */
+
+ return (read_memory_integer (get_frame_base (frame) + 4, 4));
+}
+
+static CORE_ADDR
+ns32k_frame_args_address (struct frame_info *frame)
+{
+ if (ns32k_get_enter_addr (get_frame_pc (frame)) > 1)
+ return (get_frame_base (frame));
+
+ return (read_register (SP_REGNUM) - 4);
+}
+
+/* Code to initialize the addresses of the saved registers of frame described
+ by FRAME_INFO. This includes special registers such as pc and fp saved in
+ special ways in the stack frame. sp is even more special: the address we
+ return for it IS the sp for the next frame. */
+
+static void
+ns32k_frame_init_saved_regs (struct frame_info *frame)
+{
+ int regmask, regnum;
+ int localcount;
+ CORE_ADDR enter_addr, next_addr;
+
+ if (deprecated_get_frame_saved_regs (frame))
+ return;
+
+ frame_saved_regs_zalloc (frame);
+
+ enter_addr = ns32k_get_enter_addr (get_frame_pc (frame));
+ if (enter_addr > 1)
+ {
+ regmask = read_memory_integer (enter_addr + 1, 1) & 0xff;
+ localcount = ns32k_localcount (enter_addr);
+ next_addr = get_frame_base (frame) + localcount;
+
+ for (regnum = 0; regnum < 8; regnum++)
+ {
+ if (regmask & (1 << regnum))
+ deprecated_get_frame_saved_regs (frame)[regnum] = next_addr -= 4;
+ }
+
+ deprecated_get_frame_saved_regs (frame)[SP_REGNUM] = get_frame_base (frame) + 4;
+ deprecated_get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_base (frame) + 4;
+ deprecated_get_frame_saved_regs (frame)[DEPRECATED_FP_REGNUM] = read_memory_integer (get_frame_base (frame), 4);
+ }
+ else if (enter_addr == 1)
+ {
+ CORE_ADDR sp = read_register (SP_REGNUM);
+ deprecated_get_frame_saved_regs (frame)[PC_REGNUM] = sp;
+ deprecated_get_frame_saved_regs (frame)[SP_REGNUM] = sp + 4;
+ }
+}
+
+static void
+ns32k_push_dummy_frame (void)
+{
+ CORE_ADDR sp = read_register (SP_REGNUM);
+ int regnum;
+
+ sp = push_word (sp, read_register (PC_REGNUM));
+ sp = push_word (sp, read_register (DEPRECATED_FP_REGNUM));
+ write_register (DEPRECATED_FP_REGNUM, sp);
+
+ for (regnum = 0; regnum < 8; regnum++)
+ sp = push_word (sp, read_register (regnum));
+
+ write_register (SP_REGNUM, sp);
+}
+
+static void
+ns32k_pop_frame (void)
+{
+ struct frame_info *frame = get_current_frame ();
+ CORE_ADDR fp;
+ int regnum;
+
+ fp = get_frame_base (frame);
+ DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
+
+ for (regnum = 0; regnum < 8; regnum++)
+ if (deprecated_get_frame_saved_regs (frame)[regnum])
+ write_register (regnum,
+ read_memory_integer (deprecated_get_frame_saved_regs (frame)[regnum], 4));
+
+ write_register (DEPRECATED_FP_REGNUM, read_memory_integer (fp, 4));
+ write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
+ write_register (SP_REGNUM, fp + 8);
+ flush_cached_frames ();
+}
+\f
+/* The NS32000 call dummy sequence:
+
+ enter 0xff,0 82 ff 00
+ jsr @0x00010203 7f ae c0 01 02 03
+ adjspd 0x69696969 7f a5 01 02 03 04
+ bpt f2
+
+ It is 16 bytes long. */
+
+static LONGEST ns32k_call_dummy_words[] =
+{
+ 0x7f00ff82,
+ 0x0201c0ae,
+ 0x01a57f03,
+ 0xf2040302
+};
+static int sizeof_ns32k_call_dummy_words = sizeof (ns32k_call_dummy_words);
+
+#define NS32K_CALL_DUMMY_ADDR 5
+#define NS32K_CALL_DUMMY_NARGS 11
+
+static void
+ns32k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ int flipped;
+
+ flipped = fun | 0xc0000000;
+ flip_bytes (&flipped, 4);
+ store_unsigned_integer (dummy + NS32K_CALL_DUMMY_ADDR, 4, flipped);
+
+ flipped = - nargs * 4;
+ flip_bytes (&flipped, 4);
+ store_unsigned_integer (dummy + NS32K_CALL_DUMMY_NARGS, 4, flipped);
+}
+\f
+static void
+ns32k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ /* On this machine, this is a no-op (Encore Umax didn't use GCC). */
+}
+
+static void
+ns32k_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
+{
+ memcpy (valbuf,
+ regbuf + DEPRECATED_REGISTER_BYTE (TYPE_CODE (valtype) == TYPE_CODE_FLT ?
+ FP0_REGNUM : 0), TYPE_LENGTH (valtype));
+}
+
+static void
+ns32k_store_return_value (struct type *valtype, char *valbuf)
+{
+ deprecated_write_register_bytes (TYPE_CODE (valtype) == TYPE_CODE_FLT
+ ? FP0_REGNUM : 0, valbuf,
+ TYPE_LENGTH (valtype));
+}
+
+void
+ns32k_gdbarch_init_32082 (struct gdbarch *gdbarch)
+{
+ set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32082);
+
+ set_gdbarch_register_name (gdbarch, ns32k_register_name_32082);
+ set_gdbarch_deprecated_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32082);
+ set_gdbarch_deprecated_register_byte (gdbarch, ns32k_register_byte_32082);
+}
+
+void
+ns32k_gdbarch_init_32382 (struct gdbarch *gdbarch)
+{
+ set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32382);
+
+ set_gdbarch_register_name (gdbarch, ns32k_register_name_32382);
+ set_gdbarch_deprecated_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32382);
+ set_gdbarch_deprecated_register_byte (gdbarch, ns32k_register_byte_32382);
+}
+
+/* Initialize the current architecture based on INFO. If possible, re-use an
+ architecture from ARCHES, which is a list of architectures already created
+ during this debugging session.
+
+ Called e.g. at program startup, when reading a core file, and when reading
+ a binary file. */
+
+static struct gdbarch *
+ns32k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+
+ /* If there is already a candidate, use it. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ gdbarch = gdbarch_alloc (&info, NULL);
+
+ /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
+ ready to unwind the PC first (see frame.c:get_prev_frame()). */
+ set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default);
+
+ /* Register info */
+ ns32k_gdbarch_init_32082 (gdbarch);
+ set_gdbarch_num_regs (gdbarch, NS32K_SP_REGNUM);
+ set_gdbarch_num_regs (gdbarch, NS32K_FP_REGNUM);
+ set_gdbarch_num_regs (gdbarch, NS32K_PC_REGNUM);
+ set_gdbarch_num_regs (gdbarch, NS32K_PS_REGNUM);
+
+ set_gdbarch_deprecated_register_size (gdbarch, NS32K_REGISTER_SIZE);
+ set_gdbarch_deprecated_register_raw_size (gdbarch, ns32k_register_raw_size);
+ set_gdbarch_deprecated_max_register_raw_size (gdbarch, NS32K_MAX_REGISTER_RAW_SIZE);
+ set_gdbarch_deprecated_register_virtual_size (gdbarch, ns32k_register_virtual_size);
+ set_gdbarch_deprecated_max_register_virtual_size (gdbarch,
+ NS32K_MAX_REGISTER_VIRTUAL_SIZE);
+ set_gdbarch_deprecated_register_virtual_type (gdbarch, ns32k_register_virtual_type);
+
+ /* Frame and stack info */
+ set_gdbarch_skip_prologue (gdbarch, umax_skip_prologue);
+ set_gdbarch_deprecated_saved_pc_after_call (gdbarch, ns32k_saved_pc_after_call);
+
+ set_gdbarch_frame_num_args (gdbarch, umax_frame_num_args);
+
+ set_gdbarch_deprecated_frame_chain (gdbarch, ns32k_frame_chain);
+ set_gdbarch_deprecated_frame_saved_pc (gdbarch, ns32k_frame_saved_pc);
+
+ set_gdbarch_deprecated_frame_args_address (gdbarch, ns32k_frame_args_address);
+
+ set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, ns32k_frame_init_saved_regs);
+
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ /* Return value info */
+ set_gdbarch_deprecated_store_struct_return (gdbarch, ns32k_store_struct_return);
+ set_gdbarch_deprecated_extract_return_value (gdbarch, ns32k_extract_return_value);
+ set_gdbarch_deprecated_store_return_value (gdbarch, ns32k_store_return_value);
+
+ /* Call dummy info */
+ set_gdbarch_deprecated_push_dummy_frame (gdbarch, ns32k_push_dummy_frame);
+ set_gdbarch_deprecated_pop_frame (gdbarch, ns32k_pop_frame);
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_deprecated_call_dummy_words (gdbarch, ns32k_call_dummy_words);
+ set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof_ns32k_call_dummy_words);
+ set_gdbarch_deprecated_fix_call_dummy (gdbarch, ns32k_fix_call_dummy);
+ set_gdbarch_deprecated_call_dummy_start_offset (gdbarch, 3);
+ set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 15);
+ set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0);
+ set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack);
+
+ /* Breakpoint info */
+ set_gdbarch_breakpoint_from_pc (gdbarch, ns32k_breakpoint_from_pc);
+
+ /* Should be using push_dummy_call. */
+ set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
+
+ set_gdbarch_print_insn (gdbarch, print_insn_ns32k);
+
+ /* Hook in OS ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
+
+ return (gdbarch);
+}
+
+extern initialize_file_ftype _initialize_ns32k_tdep; /* -Wmissing-prototypes */
+
+void
+_initialize_ns32k_tdep (void)
+{
+ gdbarch_register (bfd_arch_ns32k, ns32k_gdbarch_init, NULL);
+
+}
projects / deliverable / binutils-gdb.git / blobdiff