+static const char *
+vax_register_name (int regno)
+{
+ static char *register_names[] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc",
+ "ps",
+ };
+
+ if (regno < 0)
+ return (NULL);
+ if (regno >= (sizeof(register_names) / sizeof(*register_names)))
+ return (NULL);
+ return (register_names[regno]);
+}
+
+static int
+vax_register_byte (int regno)
+{
+ return (regno * 4);
+}
+
+static int
+vax_register_raw_size (int regno)
+{
+ return (4);
+}
+
+static int
+vax_register_virtual_size (int regno)
+{
+ return (4);
+}
+
+static struct type *
+vax_register_virtual_type (int regno)
+{
+ return (builtin_type_int);
+}
+\f
+static void
+vax_frame_init_saved_regs (struct frame_info *frame)
+{
+ int regnum, regmask;
+ CORE_ADDR next_addr;
+
+ if (get_frame_saved_regs (frame))
+ return;
+
+ frame_saved_regs_zalloc (frame);
+
+ regmask = read_memory_integer (get_frame_base (frame) + 4, 4) >> 16;
+
+ next_addr = get_frame_base (frame) + 16;
+
+ /* regmask's low bit is for register 0, which is the first one
+ what would be pushed. */
+ for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++)
+ {
+ if (regmask & (1 << regnum))
+ get_frame_saved_regs (frame)[regnum] = next_addr += 4;
+ }
+
+ get_frame_saved_regs (frame)[SP_REGNUM] = next_addr + 4;
+ if (regmask & (1 << FP_REGNUM))
+ get_frame_saved_regs (frame)[SP_REGNUM] +=
+ 4 + (4 * read_memory_integer (next_addr + 4, 4));
+
+ get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_base (frame) + 16;
+ get_frame_saved_regs (frame)[FP_REGNUM] = get_frame_base (frame) + 12;
+ get_frame_saved_regs (frame)[VAX_AP_REGNUM] = get_frame_base (frame) + 8;
+ get_frame_saved_regs (frame)[PS_REGNUM] = get_frame_base (frame) + 4;
+}
+
+/* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */
+
+static CORE_ADDR
+vax_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
+ (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);
+
+ /* 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 + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
+ return extract_typed_address (buf, builtin_type_void_func_ptr);
+}
+
+static CORE_ADDR
+vax_frame_saved_pc (struct frame_info *frame)
+{
+ if ((get_frame_type (frame) == SIGTRAMP_FRAME))
+ return (vax_sigtramp_saved_pc (frame)); /* XXXJRT */
+
+ return (read_memory_integer (get_frame_base (frame) + 16, 4));
+}
+
+CORE_ADDR
+vax_frame_args_address_correct (struct frame_info *frame)
+{
+ /* Cannot find the AP register value directly from the FP value. Must
+ find it saved in the frame called by this one, or in the AP register
+ for the innermost frame. However, there is no way to tell the
+ difference between the innermost frame and a frame for which we
+ just don't know the frame that it called (e.g. "info frame 0x7ffec789").
+ For the sake of argument, suppose that the stack is somewhat trashed
+ (which is one reason that "info frame" exists). So, return 0 (indicating
+ we don't know the address of the arglist) if we don't know what frame
+ this frame calls. */
+ if (get_next_frame (frame))
+ return (read_memory_integer (get_frame_base (get_next_frame (frame)) + 8, 4));
+
+ return (0);
+}
+
+static CORE_ADDR
+vax_frame_args_address (struct frame_info *frame)
+{
+ /* In most of GDB, getting the args address is too important to
+ just say "I don't know". This is sometimes wrong for functions
+ that aren't on top of the stack, but c'est la vie. */
+ if (get_next_frame (frame))
+ return (read_memory_integer (get_frame_base (get_next_frame (frame)) + 8, 4));
+
+ return (read_register (VAX_AP_REGNUM));
+}
+
+static CORE_ADDR
+vax_frame_locals_address (struct frame_info *frame)
+{
+ return (get_frame_base (frame));
+}
+
+static int
+vax_frame_num_args (struct frame_info *fi)
+{
+ return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
+}
+
+static CORE_ADDR
+vax_frame_chain (struct frame_info *frame)
+{
+ /* In the case of the VAX, the frame's nominal address is the FP value,
+ and 12 bytes later comes the saved previous FP value as a 4-byte word. */
+ if (inside_entry_file (get_frame_pc (frame)))
+ return (0);
+
+ return (read_memory_integer (get_frame_base (frame) + 12, 4));
+}
+\f
+static void
+vax_push_dummy_frame (void)
+{
+ CORE_ADDR sp = read_register (SP_REGNUM);
+ int regnum;
+
+ sp = push_word (sp, 0); /* arglist */
+ for (regnum = 11; regnum >= 0; regnum--)
+ sp = push_word (sp, read_register (regnum));
+ sp = push_word (sp, read_register (PC_REGNUM));
+ sp = push_word (sp, read_register (FP_REGNUM));
+ sp = push_word (sp, read_register (VAX_AP_REGNUM));
+ sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) + 0x2fff0000);
+ sp = push_word (sp, 0);
+ write_register (SP_REGNUM, sp);
+ write_register (FP_REGNUM, sp);
+ write_register (VAX_AP_REGNUM, sp + (17 * 4));
+}
+
+static void
+vax_pop_frame (void)
+{
+ CORE_ADDR fp = read_register (FP_REGNUM);
+ int regnum;
+ int regmask = read_memory_integer (fp + 4, 4);
+
+ write_register (PS_REGNUM,
+ (regmask & 0xffff)
+ | (read_register (PS_REGNUM) & 0xffff0000));
+ write_register (PC_REGNUM, read_memory_integer (fp + 16, 4));
+ write_register (FP_REGNUM, read_memory_integer (fp + 12, 4));
+ write_register (VAX_AP_REGNUM, read_memory_integer (fp + 8, 4));
+ fp += 16;
+ for (regnum = 0; regnum < 12; regnum++)
+ if (regmask & (0x10000 << regnum))
+ write_register (regnum, read_memory_integer (fp += 4, 4));
+ fp = fp + 4 + ((regmask >> 30) & 3);
+ if (regmask & 0x20000000)
+ {
+ regnum = read_memory_integer (fp, 4);
+ fp += (regnum + 1) * 4;
+ }
+ write_register (SP_REGNUM, fp);
+ flush_cached_frames ();
+}
+
+/* The VAX call dummy sequence:
+
+ calls #69, @#32323232
+ bpt
+
+ It is 8 bytes long. The address and argc are patched by
+ vax_fix_call_dummy(). */
+static LONGEST vax_call_dummy_words[] = { 0x329f69fb, 0x03323232 };
+static int sizeof_vax_call_dummy_words = sizeof(vax_call_dummy_words);
+
+static void
+vax_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ dummy[1] = nargs;
+ store_unsigned_integer (dummy + 3, 4, fun);
+}
+\f
+static void
+vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ write_register (1, addr);
+}
+
+static void
+vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
+{
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (valtype));
+}
+
+static void
+vax_store_return_value (struct type *valtype, char *valbuf)
+{
+ deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (valtype));
+}
+
+static CORE_ADDR
+vax_extract_struct_value_address (char *regbuf)
+{
+ return (extract_address (regbuf + REGISTER_BYTE (0), REGISTER_RAW_SIZE (0)));
+}
+\f
+static const unsigned char *
+vax_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static const unsigned char vax_breakpoint[] = { 3 };
+
+ *lenptr = sizeof(vax_breakpoint);
+ return (vax_breakpoint);
+}
+\f