+static 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_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp,
+ struct frame_info *frame, int regnum,
+ enum lval_type *lval)
+{
+ CORE_ADDR addr;
+
+ if (!target_has_registers)
+ error ("No registers.");
+
+ /* Normal systems don't optimize out things with register numbers. */
+ if (optimized != NULL)
+ *optimized = 0;
+ addr = find_saved_register (frame, regnum);
+ if (addr != 0)
+ {
+ if (lval != NULL)
+ *lval = lval_memory;
+ if (regnum == SP_REGNUM)
+ {
+ if (raw_buffer != NULL)
+ {
+ /* Put it back in target format. */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
+ (LONGEST) addr);
+ }
+ if (addrp != NULL)
+ *addrp = 0;
+ return;
+ }
+ if (raw_buffer != NULL)
+ target_read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
+ }
+ else
+ {
+ if (lval != NULL)
+ *lval = lval_register;
+ addr = REGISTER_BYTE (regnum);
+ if (raw_buffer != NULL)
+ read_register_gen (regnum, raw_buffer);
+ }
+ if (addrp != NULL)
+ *addrp = addr;
+}
+
+static void
+vax_frame_init_saved_regs (struct frame_info *frame)
+{
+ int regnum, regmask;
+ CORE_ADDR next_addr;
+
+ if (frame->saved_regs)
+ return;
+
+ frame_saved_regs_zalloc (frame);
+
+ regmask = read_memory_integer (frame->frame + 4, 4) >> 16;
+
+ next_addr = frame->frame + 16;
+
+ /* regmask's low bit is for register 0, which is the first one
+ what would be pushed. */
+ for (regnum = 0; regnum < AP_REGNUM; regnum++)
+ {
+ if (regmask & (1 << regnum))
+ frame->saved_regs[regnum] = next_addr += 4;
+ }
+
+ frame->saved_regs[SP_REGNUM] = next_addr + 4;
+ if (regmask & (1 << FP_REGNUM))
+ frame->saved_regs[SP_REGNUM] +=
+ 4 + (4 * read_memory_integer (next_addr + 4, 4));
+
+ frame->saved_regs[PC_REGNUM] = frame->frame + 16;
+ frame->saved_regs[FP_REGNUM] = frame->frame + 12;
+ frame->saved_regs[AP_REGNUM] = frame->frame + 8;
+ frame->saved_regs[PS_REGNUM] = frame->frame + 4;
+}
+
+static CORE_ADDR
+vax_frame_saved_pc (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ return (sigtramp_saved_pc (frame)); /* XXXJRT */
+
+ return (read_memory_integer (frame->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 (frame->next)
+ return (read_memory_integer (frame->next->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 (frame->next)
+ return (read_memory_integer (frame->next->frame + 8, 4));
+
+ return (read_register (AP_REGNUM));
+}
+
+static CORE_ADDR
+vax_frame_locals_address (struct frame_info *frame)
+{
+ return (frame->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 (frame->pc))
+ return (0);
+
+ return (read_memory_integer (frame->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 (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 (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 (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)
+{
+ 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
+/* Advance PC across any function entry prologue instructions
+ to reach some "real" code. */
+
+static CORE_ADDR
+vax_skip_prologue (CORE_ADDR pc)
+{
+ register int op = (unsigned char) read_memory_integer (pc, 1);
+ if (op == 0x11)
+ pc += 2; /* skip brb */
+ if (op == 0x31)
+ pc += 3; /* skip brw */
+ if (op == 0xC2
+ && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
+ pc += 3; /* skip subl2 */
+ if (op == 0x9E
+ && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
+ && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
+ pc += 4; /* skip movab */
+ if (op == 0x9E
+ && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
+ && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
+ pc += 5; /* skip movab */
+ if (op == 0x9E
+ && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
+ && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
+ pc += 7; /* skip movab */
+ return pc;
+}
+
+static CORE_ADDR
+vax_saved_pc_after_call (struct frame_info *frame)
+{
+ return (FRAME_SAVED_PC(frame));
+}
+\f