--- /dev/null
+/* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor.
+ Copyright 2001, Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "value.h"
+#include "inferior.h"
+#include "symfile.h"
+#include "arch-utils.h"
+#include "regcache.h"
+#include "gdbcore.h"
+#include "objfiles.h"
+
+struct gdbarch_tdep
+{
+ /* gdbarch target dependent data here. Currently unused for Xstormy16. */
+};
+
+/* Extra info which is saved in each frame_info. */
+struct frame_extra_info
+{
+ int framesize;
+ int frameless_p;
+};
+
+enum gdb_regnum
+{
+ /* Xstormy16 has 16 general purpose registers (R0-R15) plus PC.
+ Functions will return their values in register R2-R7 as they fit.
+ Otherwise a hidden pointer to an big enough area is given as argument
+ to the function in r2. Further arguments are beginning in r3 then.
+ R13 is used as frame pointer when GCC compiles w/o optimization
+ R14 is used as "PSW", displaying the CPU status.
+ R15 is used implicitely as stack pointer. */
+ E_R0_REGNUM,
+ E_R1_REGNUM,
+ E_R2_REGNUM, E_1ST_ARG_REGNUM = E_R2_REGNUM, E_PTR_RET_REGNUM = E_R2_REGNUM,
+ E_R3_REGNUM,
+ E_R4_REGNUM,
+ E_R5_REGNUM,
+ E_R6_REGNUM,
+ E_R7_REGNUM, E_LST_ARG_REGNUM = E_R7_REGNUM,
+ E_R8_REGNUM,
+ E_R9_REGNUM,
+ E_R10_REGNUM,
+ E_R11_REGNUM,
+ E_R12_REGNUM,
+ E_R13_REGNUM, E_FP_REGNUM = E_R13_REGNUM,
+ E_R14_REGNUM, E_PSW_REGNUM = E_R14_REGNUM,
+ E_R15_REGNUM, E_SP_REGNUM = E_R15_REGNUM,
+ E_PC_REGNUM,
+ E_NUM_REGS
+};
+
+/* Size of instructions, registers, etc. */
+enum
+{
+ xstormy16_inst_size = 2,
+ xstormy16_reg_size = 2,
+ xstormy16_pc_size = 4
+};
+
+/* Size of return datatype which fits into the remaining return registers. */
+#define E_MAX_RETTYPE_SIZE(regnum) ((E_LST_ARG_REGNUM - (regnum) + 1) \
+ * xstormy16_reg_size)
+
+/* Size of return datatype which fits into all return registers. */
+enum
+{
+ E_MAX_RETTYPE_SIZE_IN_REGS = E_MAX_RETTYPE_SIZE (E_R2_REGNUM)
+};
+
+
+/* Size of all registers as a whole. */
+enum
+{
+ E_ALL_REGS_SIZE = (E_NUM_REGS - 1) * xstormy16_reg_size + xstormy16_pc_size
+};
+
+/* Function: xstormy16_register_name
+ Returns the name of the standard Xstormy16 register N. */
+
+static char *
+xstormy16_register_name (int regnum)
+{
+ static char *register_names[] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13",
+ "psw", "sp", "pc"
+ };
+
+ if (regnum < 0 ||
+ regnum >= sizeof (register_names) / sizeof (register_names[0]))
+ internal_error (__FILE__, __LINE__,
+ "xstormy16_register_name: illegal register number %d",
+ regnum);
+ else
+ return register_names[regnum];
+
+}
+
+/* Function: xstormy16_register_byte
+ Returns the byte position in the register cache for register N. */
+
+static int
+xstormy16_register_byte (int regnum)
+{
+ if (regnum < 0 || regnum >= E_NUM_REGS)
+ internal_error (__FILE__, __LINE__,
+ "xstormy16_register_byte: illegal register number %d",
+ regnum);
+ else
+ /* All registers occupy 2 bytes in the regcache except for PC
+ which is the last one. Therefore the byte position is still
+ simply a multiple of 2. */
+ return regnum * xstormy16_reg_size;
+}
+
+/* Function: xstormy16_register_raw_size
+ Returns the number of bytes occupied by the register on the target. */
+
+static int
+xstormy16_register_raw_size (int regnum)
+{
+ if (regnum < 0 || regnum >= E_NUM_REGS)
+ internal_error (__FILE__, __LINE__,
+ "xstormy16_register_raw_size: illegal register number %d",
+ regnum);
+ /* Only the PC has 4 Byte, all other registers 2 Byte. */
+ else if (regnum == E_PC_REGNUM)
+ return xstormy16_pc_size;
+ else
+ return xstormy16_reg_size;
+}
+
+/* Function: xstormy16_register_virtual_size
+ Returns the number of bytes occupied by the register as represented
+ internally by gdb. */
+
+static int
+xstormy16_register_virtual_size (int regnum)
+{
+ return xstormy16_register_raw_size (regnum);
+}
+
+/* Function: xstormy16_reg_virtual_type
+ Returns the default type for register N. */
+
+static struct type *
+xstormy16_reg_virtual_type (int regnum)
+{
+ if (regnum < 0 || regnum >= E_NUM_REGS)
+ internal_error (__FILE__, __LINE__,
+ "xstormy16_register_virtual_type: illegal register number %d",
+ regnum);
+ else if (regnum == E_PC_REGNUM)
+ return builtin_type_uint32;
+ else
+ return builtin_type_uint16;
+}
+
+/* Function: xstormy16_get_saved_register
+ Find a register's saved value on the call stack. */
+
+static void
+xstormy16_get_saved_register (char *raw_buffer,
+ int *optimized,
+ CORE_ADDR *addrp,
+ struct frame_info *fi,
+ int regnum, enum lval_type *lval)
+{
+ generic_get_saved_register (raw_buffer, optimized, addrp, fi, regnum, lval);
+}
+
+/* Function: xstormy16_type_is_scalar
+ Makes the decision if a given type is a scalar types. Scalar
+ types are returned in the registers r2-r7 as they fit. */
+
+static int
+xstormy16_type_is_scalar (struct type *t)
+{
+ return (TYPE_CODE(t) != TYPE_CODE_STRUCT
+ && TYPE_CODE(t) != TYPE_CODE_UNION
+ && TYPE_CODE(t) != TYPE_CODE_ARRAY);
+}
+
+/* Function: xstormy16_extract_return_value
+ Copy the function's return value into VALBUF.
+ This function is called only in the context of "target function calls",
+ ie. when the debugger forces a function to be called in the child, and
+ when the debugger forces a function to return prematurely via the
+ "return" command. */
+
+static void
+xstormy16_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+{
+ CORE_ADDR return_buffer;
+ int offset = 0;
+
+ if (xstormy16_type_is_scalar (type)
+ && TYPE_LENGTH (type) <= E_MAX_RETTYPE_SIZE_IN_REGS)
+ {
+ /* Scalar return values of <= 12 bytes are returned in
+ E_1ST_ARG_REGNUM to E_LST_ARG_REGNUM. */
+ memcpy (valbuf,
+ ®buf[REGISTER_BYTE (E_1ST_ARG_REGNUM)] + offset,
+ TYPE_LENGTH (type));
+ }
+ else
+ {
+ /* Aggregates and return values > 12 bytes are returned in memory,
+ pointed to by R2. */
+ return_buffer =
+ extract_address (regbuf + REGISTER_BYTE (E_PTR_RET_REGNUM),
+ REGISTER_RAW_SIZE (E_PTR_RET_REGNUM));
+
+ read_memory (return_buffer, valbuf, TYPE_LENGTH (type));
+ }
+}
+
+/* Function: xstormy16_push_arguments
+ Setup the function arguments for GDB to call a function in the inferior.
+ Called only in the context of a target function call from the debugger.
+ Returns the value of the SP register after the args are pushed.
+*/
+
+static CORE_ADDR
+xstormy16_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
+{
+ CORE_ADDR stack_dest = sp;
+ int argreg = E_1ST_ARG_REGNUM;
+ int i, j;
+ int typelen, slacklen;
+ char *val;
+
+ /* If struct_return is true, then the struct return address will
+ consume one argument-passing register. */
+ if (struct_return)
+ argreg++;
+
+ /* Arguments are passed in R2-R7 as they fit. If an argument doesn't
+ fit in the remaining registers we're switching over to the stack.
+ No argument is put on stack partially and as soon as we switched
+ over to stack no further argument is put in a register even if it
+ would fit in the remaining unused registers. */
+ for (i = 0; i < nargs && argreg <= E_LST_ARG_REGNUM; i++)
+ {
+ typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i]));
+ if (typelen > E_MAX_RETTYPE_SIZE (argreg))
+ break;
+
+ /* Put argument into registers wordwise. */
+ val = VALUE_CONTENTS (args[i]);
+ for (j = 0; j < typelen; j += xstormy16_reg_size)
+ write_register (argreg++,
+ extract_unsigned_integer (val + j,
+ typelen - j ==
+ 1 ? 1 :
+ xstormy16_reg_size));
+ }
+
+ /* Align SP */
+ if (stack_dest & 1)
+ ++stack_dest;
+
+ /* Loop backwards through remaining arguments and push them on the stack,
+ wordaligned. */
+ for (j = nargs - 1; j >= i; j--)
+ {
+ typelen = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[j]));
+ slacklen = typelen & 1;
+ val = alloca (typelen + slacklen);
+ memcpy (val, VALUE_CONTENTS (args[j]), typelen);
+ memset (val + typelen, 0, slacklen);
+
+ /* Now write this data to the stack. The stack grows upwards. */
+ write_memory (stack_dest, val, typelen + slacklen);
+ stack_dest += typelen + slacklen;
+ }
+
+ /* And that should do it. Return the new stack pointer. */
+ return stack_dest;
+}
+
+/* Function: xstormy16_push_return_address (pc)
+ Setup the return address for GDB to call a function in the inferior.
+ Called only in the context of a target function call from the debugger.
+ Returns the value of the SP register when the operation is finished
+ (which may or may not be the same as before).
+*/
+
+CORE_ADDR
+xstormy16_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+ unsigned char buf[xstormy16_pc_size];
+
+ store_unsigned_integer (buf, xstormy16_pc_size, CALL_DUMMY_ADDRESS ());
+ write_memory (sp, buf, xstormy16_pc_size);
+ return sp + xstormy16_pc_size;
+}
+
+/* Function: xstormy16_pop_frame
+ Destroy the innermost (Top-Of-Stack) stack frame, restoring the
+ machine state that was in effect before the frame was created.
+ Used in the contexts of the "return" command, and of
+ target function calls from the debugger.
+*/
+
+static void
+xstormy16_pop_frame (void)
+{
+ struct frame_info *fi = get_current_frame ();
+ int i;
+
+ if (fi == NULL)
+ return; /* paranoia */
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ {
+ generic_pop_dummy_frame ();
+ }
+ else
+ {
+ /* Restore the saved regs. */
+ for (i = 0; i < NUM_REGS; i++)
+ if (fi->saved_regs[i])
+ {
+ if (i == SP_REGNUM)
+ write_register (i, fi->saved_regs[i]);
+ else if (i == E_PC_REGNUM)
+ write_register (i, read_memory_integer (fi->saved_regs[i],
+ xstormy16_pc_size));
+ else
+ write_register (i, read_memory_integer (fi->saved_regs[i],
+ xstormy16_reg_size));
+ }
+ /* Restore the PC */
+ write_register (PC_REGNUM, FRAME_SAVED_PC (fi));
+ flush_cached_frames ();
+ }
+ return;
+}
+
+/* Function: xstormy16_store_struct_return
+ Copy the (struct) function return value to its destined location.
+ Called only in the context of a target function call from the debugger.
+*/
+
+static void
+xstormy16_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ write_register (E_PTR_RET_REGNUM, addr);
+}
+
+/* Function: xstormy16_store_return_value
+ Copy the function return value from VALBUF into the
+ proper location for a function return.
+ Called only in the context of the "return" command.
+*/
+
+static void
+xstormy16_store_return_value (struct type *type, char *valbuf)
+{
+ CORE_ADDR return_buffer;
+ char buf[xstormy16_reg_size];
+
+ if (xstormy16_type_is_scalar (type) && TYPE_LENGTH (type) == 1)
+ {
+ /* Add leading zeros to the value. */
+ memset (buf, 0, xstormy16_reg_size);
+ memcpy (buf, valbuf, 1);
+ write_register_gen (E_1ST_ARG_REGNUM, buf);
+ }
+ else if (xstormy16_type_is_scalar (type) &&
+ TYPE_LENGTH (type) <= E_MAX_RETTYPE_SIZE_IN_REGS)
+ write_register_bytes (REGISTER_BYTE (E_1ST_ARG_REGNUM),
+ valbuf, TYPE_LENGTH (type));
+ else
+ {
+ return_buffer = read_register (E_PTR_RET_REGNUM);
+ write_memory (return_buffer, valbuf, TYPE_LENGTH (type));
+ }
+}
+
+/* Function: xstormy16_extract_struct_value_address
+ Returns the address in which a function should return a struct value.
+ Used in the contexts of the "return" command, and of
+ target function calls from the debugger.
+*/
+
+static CORE_ADDR
+xstormy16_extract_struct_value_address (char *regbuf)
+{
+ return extract_address (regbuf +
+ xstormy16_register_byte (E_PTR_RET_REGNUM),
+ xstormy16_reg_size);
+}
+
+/* Function: xstormy16_use_struct_convention
+ Returns non-zero if the given struct type will be returned using
+ a special convention, rather than the normal function return method.
+ 7sed in the contexts of the "return" command, and of
+ target function calls from the debugger.
+*/
+
+static int
+xstormy16_use_struct_convention (int gcc_p, struct type *type)
+{
+ return !xstormy16_type_is_scalar (type)
+ || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS;
+}
+
+/* Function: frame_saved_register
+ Returns the value that regnum had in frame fi
+ (saved in fi or in one of its children).
+*/
+
+static CORE_ADDR
+xstormy16_frame_saved_register (struct frame_info *fi, int regnum)
+{
+ int size = xstormy16_register_raw_size (regnum);
+ char *buf = (char *) alloca (size);
+
+ generic_get_saved_register (buf, NULL, NULL, fi, regnum, NULL);
+ return (CORE_ADDR) extract_unsigned_integer (buf, size);
+}
+
+/* Function: xstormy16_scan_prologue
+ Decode the instructions within the given address range.
+ Decide when we must have reached the end of the function prologue.
+ If a frame_info pointer is provided, fill in its saved_regs etc.
+
+ Returns the address of the first instruction after the prologue.
+*/
+
+static CORE_ADDR
+xstormy16_scan_prologue (CORE_ADDR start_addr,
+ CORE_ADDR end_addr, struct frame_info *fi)
+{
+ CORE_ADDR sp = 0, fp = 0;
+ CORE_ADDR next_addr;
+ ULONGEST inst, inst2;
+ LONGEST offset;
+ int regnum;
+
+ if (fi)
+ {
+ /* In a call dummy, don't touch the frame. */
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return start_addr;
+
+ /* Grab the frame-relative values of SP and FP, needed below.
+ The frame_saved_register function will find them on the
+ stack or in the registers as appropriate. */
+ sp = xstormy16_frame_saved_register (fi, E_SP_REGNUM);
+ fp = xstormy16_frame_saved_register (fi, E_FP_REGNUM);
+
+ /* Initialize framesize with size of PC put on stack by CALLF inst. */
+ fi->extra_info->framesize = xstormy16_pc_size;
+ }
+ for (next_addr = start_addr;
+ next_addr < end_addr; next_addr += xstormy16_inst_size)
+ {
+ inst = read_memory_unsigned_integer (next_addr, xstormy16_inst_size);
+ inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size,
+ xstormy16_inst_size);
+
+ if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */
+ {
+ if (fi)
+ {
+ regnum = inst & 0x000f;
+ fi->saved_regs[regnum] = fi->extra_info->framesize;
+ fi->extra_info->framesize += xstormy16_reg_size;
+ }
+ }
+
+ /* optional stack allocation for args and local vars <= 4 byte */
+ else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */
+ {
+ if (fi) /* Record the frame size. */
+ fi->extra_info->framesize += ((inst & 0x0030) >> 4) + 1;
+ }
+
+ /* optional stack allocation for args and local vars > 4 && < 16 byte */
+ else if ((inst & 0xff0f) == 0x510f) /* 51Hf add r15, #0xH */
+ {
+ if (fi) /* Record the frame size. */
+ fi->extra_info->framesize += (inst & 0x00f0) >> 4;
+ }
+
+ /* optional stack allocation for args and local vars >= 16 byte */
+ else if (inst == 0x314f && inst2 >= 0x0010) /* 314f HHHH add r15, #0xH */
+ {
+ if (fi) /* Record the frame size. */
+ fi->extra_info->framesize += inst2;
+ next_addr += xstormy16_inst_size;
+ }
+
+ else if (inst == 0x46fd) /* mov r13, r15 */
+ {
+ if (fi) /* Record that the frame pointer is in use. */
+ fi->extra_info->frameless_p = 0;
+ }
+
+ /* optional copying of args in r2-r7 to r10-r13 */
+ /* Probably only in optimized case but legal action for prologue */
+ else if ((inst & 0xff00) == 0x4600 /* 46SD mov rD, rS */
+ && (inst & 0x00f0) >= 0x0020 && (inst & 0x00f0) <= 0x0070
+ && (inst & 0x000f) >= 0x00a0 && (inst & 0x000f) <= 0x000d)
+ ;
+
+ /* optional copying of args in r2-r7 to stack */
+ /* 72DS HHHH mov.b (rD, 0xHHHH), r(S-8) (bit3 always 1, bit2-0 = reg) */
+ /* 73DS HHHH mov.w (rD, 0xHHHH), r(S-8) */
+ else if ((inst & 0xfed8) == 0x72d8 && (inst & 0x0007) >= 2)
+ {
+ if (fi)
+ {
+ regnum = inst & 0x0007;
+ /* Only 12 of 16 bits of the argument are used for the
+ signed offset. */
+ offset = (LONGEST) (inst2 & 0x0fff);
+ if (offset & 0x0800)
+ offset -= 0x1000;
+
+ fi->saved_regs[regnum] = fi->extra_info->framesize + offset;
+ }
+ next_addr += xstormy16_inst_size;
+ }
+
+#if 0
+ /* 2001-08-10: Not part of the prologue anymore due to change in
+ ABI. r8 and r9 are not used for argument passing anymore. */
+
+ /* optional copying of r8, r9 to stack */
+ /* 46S7; 73Df HHHH mov.w r7,rS; mov.w (rD, 0xHHHH), r7 D=8,9; S=13,15 */
+ /* 46S7; 72df HHHH mov.w r7,rS; mov.b (rD, 0xHHHH), r7 D=8,9; S=13,15 */
+ else if ((inst & 0xffef) == 0x4687 && (inst2 & 0xfedf) == 0x72df)
+ {
+ next_addr += xstormy16_inst_size;
+ if (fi)
+ {
+ regnum = (inst & 0x00f0) >> 4;
+ inst = inst2;
+ inst2 = read_memory_unsigned_integer (next_addr
+ + xstormy16_inst_size,
+ xstormy16_inst_size);
+ /* Only 12 of 16 bits of the argument are used for the
+ signed offset. */
+ offset = (LONGEST) (inst2 & 0x0fff);
+ if (offset & 0x0800)
+ offset -= 0x1000;
+
+ fi->saved_regs[regnum] = fi->extra_info->framesize + offset;
+ }
+ next_addr += xstormy16_inst_size;
+ }
+#endif
+
+ else /* Not a prologue instruction. */
+ break;
+ }
+
+ if (fi)
+ {
+ /* Special handling for the "saved" address of the SP:
+ The SP is of course never saved on the stack at all, so
+ by convention what we put here is simply the previous
+ _value_ of the SP (as opposed to an address where the
+ previous value would have been pushed). */
+ if (fi->extra_info->frameless_p)
+ {
+ fi->saved_regs[E_SP_REGNUM] = sp - fi->extra_info->framesize;
+ fi->frame = sp;
+ }
+ else
+ {
+ fi->saved_regs[E_SP_REGNUM] = fp - fi->extra_info->framesize;
+ fi->frame = fp;
+ }
+
+ /* So far only offsets to the beginning of the frame are
+ saved in the saved_regs. Now we now the relation between
+ sp, fp and framesize. We know the beginning of the frame
+ so we can translate the register offsets to real addresses. */
+ for (regnum = 0; regnum < E_SP_REGNUM; ++regnum)
+ if (fi->saved_regs[regnum])
+ fi->saved_regs[regnum] += fi->saved_regs[E_SP_REGNUM];
+
+ /* Save address of PC on stack. */
+ fi->saved_regs[E_PC_REGNUM] = fi->saved_regs[E_SP_REGNUM];
+ }
+
+ return next_addr;
+}
+
+/* Function: xstormy16_skip_prologue
+ If the input address is in a function prologue,
+ returns the address of the end of the prologue;
+ else returns the input address.
+
+ Note: the input address is likely to be the function start,
+ since this function is mainly used for advancing a breakpoint
+ to the first line, or stepping to the first line when we have
+ stepped into a function call. */
+
+static CORE_ADDR
+xstormy16_skip_prologue (CORE_ADDR pc)
+{
+ CORE_ADDR func_addr = 0, func_end = 0;
+ char *func_name;
+
+ if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end))
+ {
+ struct symtab_and_line sal;
+ struct symbol *sym;
+
+ /* Found a function. */
+ sym = lookup_symbol (func_name, NULL, VAR_NAMESPACE, NULL, NULL);
+ if (sym && SYMBOL_LANGUAGE (sym) != language_asm)
+ {
+ /* Don't use this trick for assembly source files. */
+ sal = find_pc_line (func_addr, 0);
+ if (sal.end && sal.end < func_end)
+ {
+ /* Found a line number, use it as end of prologue. */
+ return sal.end;
+ }
+ }
+ /* No useable line symbol. Use prologue parsing method. */
+ return xstormy16_scan_prologue (func_addr, func_end, NULL);
+ }
+
+ /* No function symbol -- just return the PC. */
+
+ return (CORE_ADDR) pc;
+}
+
+/* The epilogue is defined here as the area at the end of a function,
+ either on the `ret' instruction itself or after an instruction which
+ destroys the function's stack frame. */
+static int
+xstormy16_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ CORE_ADDR addr, func_addr = 0, func_end = 0;
+
+ if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ {
+ ULONGEST inst, inst2;
+ CORE_ADDR addr = func_end - xstormy16_inst_size;
+
+ /* The Xstormy16 epilogue is max. 14 bytes long. */
+ if (pc < func_end - 7 * xstormy16_inst_size)
+ return 0;
+
+ /* Check if we're on a `ret' instruction. Otherwise it's
+ too dangerous to proceed. */
+ inst = read_memory_unsigned_integer (addr, xstormy16_inst_size);
+ if (inst != 0x0003)
+ return 0;
+
+ while ((addr -= xstormy16_inst_size) >= func_addr)
+ {
+ inst = read_memory_unsigned_integer (addr, xstormy16_inst_size);
+ if (inst >= 0x009a && inst <= 0x009d) /* pop r10...r13 */
+ continue;
+ if (inst == 0x305f || inst == 0x307f) /* dec r15, #0x1/#0x3 */
+ break;
+ inst2 = read_memory_unsigned_integer (addr - xstormy16_inst_size,
+ xstormy16_inst_size);
+ if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */
+ {
+ addr -= xstormy16_inst_size;
+ break;
+ }
+ return 0;
+ }
+ if (pc > addr)
+ return 1;
+ }
+ return 0;
+}
+
+/* Function: xstormy16_frame_init_saved_regs
+ Set up the 'saved_regs' array.
+ This is a data structure containing the addresses on the stack
+ where each register has been saved, for each stack frame.
+ Registers that have not been saved will have zero here.
+ The stack register is special: rather than the address where the
+ stack register has been saved, saved_regs[SP_REGNUM] will have the
+ actual value of the previous frame's stack register.
+
+ This function may be called in any context where the saved register
+ values may be needed (backtrace, frame_info, get_saved_register).
+ On many targets, it is called directly by init_extra_frame_info,
+ in part because the information may be needed immediately by
+ frame_chain.
+*/
+
+static void
+xstormy16_frame_init_saved_regs (struct frame_info *fi)
+{
+ CORE_ADDR func_addr, func_end;
+
+ if (!fi->saved_regs)
+ {
+ frame_saved_regs_zalloc (fi);
+
+ /* Find the beginning of this function, so we can analyze its
+ prologue. */
+ if (find_pc_partial_function (fi->pc, NULL, &func_addr, &func_end))
+ xstormy16_scan_prologue (func_addr, fi->pc, fi);
+ /* Else we're out of luck (can't debug completely stripped code).
+ FIXME. */
+ }
+}
+
+/* Function: xstormy16_frame_saved_pc
+ Returns the return address for the selected frame.
+ Called by frame_info, frame_chain_valid, and sometimes by
+ get_prev_frame.
+*/
+
+static CORE_ADDR
+xstormy16_frame_saved_pc (struct frame_info *fi)
+{
+ CORE_ADDR saved_pc;
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ {
+ saved_pc = generic_read_register_dummy (fi->pc, fi->frame, E_PC_REGNUM);
+ }
+ else
+ {
+ saved_pc = read_memory_unsigned_integer (fi->saved_regs[E_PC_REGNUM],
+ xstormy16_pc_size);
+ }
+
+ return saved_pc;
+}
+
+/* Function: xstormy16_init_extra_frame_info
+ This is the constructor function for the frame_info struct,
+ called whenever a new frame_info is created (from create_new_frame,
+ and from get_prev_frame).
+*/
+
+static void
+xstormy16_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+{
+ if (!fi->extra_info)
+ {
+ fi->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+ fi->extra_info->framesize = 0;
+ fi->extra_info->frameless_p = 1; /* Default frameless, detect framed */
+
+ /* By default, the fi->frame is set to the value of the FP reg by gdb.
+ This may not always be right; we may be in a frameless function,
+ or we may be in the prologue, before the FP has been set up.
+ Unfortunately, we can't make this determination without first
+ calling scan_prologue, and we can't do that unles we know the
+ fi->pc. */
+
+ if (!fi->pc)
+ {
+ /* Sometimes we are called from get_prev_frame without
+ the PC being set up first. Long history, don't ask.
+ Fortunately this will never happen from the outermost
+ frame, so we should be able to get the saved pc from
+ the next frame. */
+ if (fi->next)
+ fi->pc = xstormy16_frame_saved_pc (fi->next);
+ }
+
+ /* Take care of the saved_regs right here (non-lazy). */
+ xstormy16_frame_init_saved_regs (fi);
+ }
+}
+
+/* Function: xstormy16_frame_chain
+ Returns a pointer to the stack frame of the calling function.
+ Called only from get_prev_frame. Needed for backtrace, "up", etc.
+*/
+
+static CORE_ADDR
+xstormy16_frame_chain (struct frame_info *fi)
+{
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ {
+ /* Call dummy's frame is the same as caller's. */
+ return fi->frame;
+ }
+ else
+ {
+ /* Return computed offset from this frame's fp. */
+ return fi->frame - fi->extra_info->framesize;
+ }
+}
+
+static int
+xstormy16_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
+{
+ return chain < 0x8000 && FRAME_SAVED_PC (thisframe) >= 0x8000 &&
+ (thisframe->extra_info->frameless_p ||
+ thisframe->frame - thisframe->extra_info->framesize == chain);
+}
+
+/* Function: xstormy16_saved_pc_after_call
+ Returns the previous PC immediately after a function call.
+ This function is meant to bypass the regular get_saved_register
+ mechanism, ie. it is meant to work even if the frame isn't complete.
+ Called by step_over_function, and sometimes by get_prev_frame.
+*/
+
+static CORE_ADDR
+xstormy16_saved_pc_after_call (struct frame_info *ignore)
+{
+ CORE_ADDR sp, pc, tmp;
+
+ sp = read_register (E_SP_REGNUM) - xstormy16_pc_size;
+ pc = read_memory_integer (sp, xstormy16_pc_size);
+
+ /* Skip over jump table entry if necessary. */
+ if ((tmp = SKIP_TRAMPOLINE_CODE (pc)))
+ pc = tmp;
+
+ return pc;
+}
+
+static unsigned char *
+xstormy16_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char breakpoint[] = { 0x06, 0x0 };
+ *lenptr = sizeof (breakpoint);
+ return breakpoint;
+}
+
+/* Given a pointer to a jump table entry, return the address
+ of the function it jumps to. Return 0 if not found. */
+static CORE_ADDR
+xstormy16_resolve_jmp_table_entry (CORE_ADDR faddr)
+{
+ struct obj_section *faddr_sect = find_pc_section (faddr);
+
+ if (faddr_sect)
+ {
+ LONGEST inst, inst2, addr;
+ char buf[2 * xstormy16_inst_size];
+
+ /* Return faddr if it's not pointing into the jump table. */
+ if (strcmp (faddr_sect->the_bfd_section->name, ".plt"))
+ return faddr;
+
+ if (!target_read_memory (faddr, buf, sizeof buf))
+ {
+ inst = extract_unsigned_integer (buf, xstormy16_inst_size);
+ inst2 = extract_unsigned_integer (buf + xstormy16_inst_size,
+ xstormy16_inst_size);
+ addr = inst2 << 8 | (inst & 0xff);
+ return addr;
+ }
+ }
+ return 0;
+}
+
+/* Given a function's address, attempt to find (and return) the
+ address of the corresponding jump table entry. Return 0 if
+ not found. */
+static CORE_ADDR
+xstormy16_find_jmp_table_entry (CORE_ADDR faddr)
+{
+ struct obj_section *faddr_sect = find_pc_section (faddr);
+
+ if (faddr_sect)
+ {
+ struct obj_section *osect;
+
+ /* Return faddr if it's already a pointer to a jump table entry. */
+ if (!strcmp (faddr_sect->the_bfd_section->name, ".plt"))
+ return faddr;
+
+ ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect)
+ {
+ if (!strcmp (osect->the_bfd_section->name, ".plt"))
+ break;
+ }
+
+ if (osect < faddr_sect->objfile->sections_end)
+ {
+ CORE_ADDR addr;
+ for (addr = osect->addr;
+ addr < osect->endaddr; addr += 2 * xstormy16_inst_size)
+ {
+ int status;
+ LONGEST inst, inst2, faddr2;
+ char buf[2 * xstormy16_inst_size];
+
+ if (target_read_memory (addr, buf, sizeof buf))
+ return 0;
+ inst = extract_unsigned_integer (buf, xstormy16_inst_size);
+ inst2 = extract_unsigned_integer (buf + xstormy16_inst_size,
+ xstormy16_inst_size);
+ faddr2 = inst2 << 8 | (inst & 0xff);
+ if (faddr == faddr2)
+ return addr;
+ }
+ }
+ }
+ return 0;
+}
+
+static CORE_ADDR
+xstormy16_skip_trampoline_code (CORE_ADDR pc)
+{
+ int tmp = xstormy16_resolve_jmp_table_entry (pc);
+
+ if (tmp && tmp != pc)
+ return tmp;
+ return 0;
+}
+
+static int
+xstormy16_in_solib_call_trampoline (CORE_ADDR pc, char *name)
+{
+ return xstormy16_skip_trampoline_code (pc) != 0;
+}
+
+static CORE_ADDR
+xstormy16_pointer_to_address (struct type *type, void *buf)
+{
+ enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type));
+ CORE_ADDR addr = extract_address (buf, TYPE_LENGTH (type));
+
+ if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD)
+ {
+ CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (addr);
+ if (addr2)
+ addr = addr2;
+ }
+
+ return addr;
+}
+
+static void
+xstormy16_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr)
+{
+ enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type));
+
+ if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD)
+ {
+ CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (addr);
+ if (addr2)
+ addr = addr2;
+ }
+ store_address (buf, TYPE_LENGTH (type), addr);
+}
+
+static CORE_ADDR
+xstormy16_stack_align (CORE_ADDR addr)
+{
+ if (addr & 1)
+ ++addr;
+ return addr;
+}
+
+void
+xstormy16_save_dummy_frame_tos (CORE_ADDR sp)
+{
+ generic_save_dummy_frame_tos (sp - xstormy16_pc_size);
+}
+
+/* Function: xstormy16_gdbarch_init
+ Initializer function for the xstormy16 gdbarch vector.
+ Called by gdbarch. Sets up the gdbarch vector(s) for this target. */
+
+static struct gdbarch *
+xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ static LONGEST call_dummy_words[1] = { 0 };
+ struct gdbarch_tdep *tdep = NULL;
+ struct gdbarch *gdbarch;
+
+ /* find a candidate among the list of pre-declared architectures. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return (arches->gdbarch);
+
+#if 0
+ tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
+#endif
+
+ gdbarch = gdbarch_alloc (&info, 0);
+
+ /*
+ * Basic register fields and methods.
+ */
+
+ set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
+ set_gdbarch_num_pseudo_regs (gdbarch, 0);
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
+ set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_register_name (gdbarch, xstormy16_register_name);
+ set_gdbarch_register_size (gdbarch, xstormy16_reg_size);
+ set_gdbarch_register_bytes (gdbarch, E_ALL_REGS_SIZE);
+ set_gdbarch_register_byte (gdbarch, xstormy16_register_byte);
+ set_gdbarch_register_raw_size (gdbarch, xstormy16_register_raw_size);
+ set_gdbarch_max_register_raw_size (gdbarch, xstormy16_pc_size);
+ set_gdbarch_register_virtual_size (gdbarch, xstormy16_register_raw_size);
+ set_gdbarch_max_register_virtual_size (gdbarch, 4);
+ set_gdbarch_register_virtual_type (gdbarch, xstormy16_reg_virtual_type);
+
+ /*
+ * Frame Info
+ */
+ set_gdbarch_init_extra_frame_info (gdbarch,
+ xstormy16_init_extra_frame_info);
+ set_gdbarch_frame_init_saved_regs (gdbarch,
+ xstormy16_frame_init_saved_regs);
+ set_gdbarch_frame_chain (gdbarch, xstormy16_frame_chain);
+ set_gdbarch_get_saved_register (gdbarch, xstormy16_get_saved_register);
+ set_gdbarch_saved_pc_after_call (gdbarch, xstormy16_saved_pc_after_call);
+ set_gdbarch_frame_saved_pc (gdbarch, xstormy16_frame_saved_pc);
+ set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue);
+ set_gdbarch_frame_chain_valid (gdbarch, xstormy16_frame_chain_valid);
+ set_gdbarch_frame_args_address (gdbarch, default_frame_address);
+ set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
+
+ set_gdbarch_in_function_epilogue_p (gdbarch,
+ xstormy16_in_function_epilogue_p);
+
+ /*
+ * Miscelany
+ */
+ /* Stack grows up. */
+ set_gdbarch_inner_than (gdbarch, core_addr_greaterthan);
+ /* PC stops zero byte after a trap instruction
+ (which means: exactly on trap instruction). */
+ set_gdbarch_decr_pc_after_break (gdbarch, 0);
+ /* This value is almost never non-zero... */
+ set_gdbarch_function_start_offset (gdbarch, 0);
+ /* This value is almost never non-zero... */
+ set_gdbarch_frame_args_skip (gdbarch, 0);
+ /* OK to default this value to 'unknown'. */
+ set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
+
+ /* W/o prototype, coerce float args to double. */
+ set_gdbarch_coerce_float_to_double (gdbarch,
+ standard_coerce_float_to_double);
+
+ /*
+ * Call Dummies
+ *
+ * These values and methods are used when gdb calls a target function. */
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
+ set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
+ set_gdbarch_push_return_address (gdbarch, xstormy16_push_return_address);
+ set_gdbarch_extract_return_value (gdbarch, xstormy16_extract_return_value);
+ set_gdbarch_push_arguments (gdbarch, xstormy16_push_arguments);
+ set_gdbarch_pop_frame (gdbarch, xstormy16_pop_frame);
+ set_gdbarch_store_struct_return (gdbarch, xstormy16_store_struct_return);
+ set_gdbarch_store_return_value (gdbarch, xstormy16_store_return_value);
+ set_gdbarch_extract_struct_value_address (gdbarch,
+ xstormy16_extract_struct_value_address);
+ set_gdbarch_use_struct_convention (gdbarch,
+ xstormy16_use_struct_convention);
+ set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
+ set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
+ set_gdbarch_call_dummy_start_offset (gdbarch, 0);
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ set_gdbarch_call_dummy_length (gdbarch, 0);
+ set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_words (gdbarch, call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ /* set_gdbarch_call_dummy_stack_adjust */
+ set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
+ set_gdbarch_breakpoint_from_pc (gdbarch, xstormy16_breakpoint_from_pc);
+
+ set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
+ set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
+ set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
+ set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
+
+ set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer);
+ set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address);
+
+ set_gdbarch_stack_align (gdbarch, xstormy16_stack_align);
+ set_gdbarch_extra_stack_alignment_needed (gdbarch, 0);
+
+ set_gdbarch_save_dummy_frame_tos (gdbarch, xstormy16_save_dummy_frame_tos);
+
+ set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code);
+
+ set_gdbarch_in_solib_call_trampoline (gdbarch,
+ xstormy16_in_solib_call_trampoline);
+
+ return gdbarch;
+}
+
+/* Function: _initialize_xstormy16_tdep
+ Initializer function for the Sanyo Xstormy16a module.
+ Called by gdb at start-up. */
+
+void
+_initialize_xstormy16_tdep (void)
+{
+ extern int print_insn_xstormy16 ();
+
+ register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init);
+ tm_print_insn = print_insn_xstormy16;
+}
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