-/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.\r
-\r
- Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free\r
- Software Foundation, Inc.\r
-\r
- This file is part of GDB.\r
-\r
- This program is free software; you can redistribute it and/or modify\r
- it under the terms of the GNU General Public License as published by\r
- the Free Software Foundation; either version 2 of the License, or\r
- (at your option) any later version.\r
-\r
- This program is distributed in the hope that it will be useful,\r
- but WITHOUT ANY WARRANTY; without even the implied warranty of\r
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
- GNU General Public License for more details.\r
-\r
- You should have received a copy of the GNU General Public License\r
- along with this program; if not, write to the Free Software\r
- Foundation, Inc., 59 Temple Place - Suite 330,\r
- Boston, MA 02111-1307, USA. */\r
-\r
-/* MVS Notes:\r
-\r
- To get from 1.1 to 1.2, add:\r
- use_struct_convention\r
- store_return_value\r
- extract_return_value\r
- extract_struct_value_address\r
- \r
- Make sure to use regcache. */\r
-\r
-/* MVS Notes:\r
-\r
- Apparently cannot run without a stub placeholder for unwind_dummy_id. \r
-*/\r
-\r
-/* MVS Notes:\r
-\r
- To get from 1.2 to 1.3, add:\r
- read_pc, write_pc\r
- frame_unwind_init\r
- struct mn10300_unwind_cache\r
- unwind_pc\r
- unwind_dummy_id\r
- frame_this_id\r
- frame_prev_register\r
- frame_sniffer (struct mn10300_frame_unwind)\r
-*/\r
-\r
-#include "defs.h"\r
-#include "arch-utils.h"\r
-#include "dis-asm.h"\r
-#include "gdbtypes.h"\r
-#include "regcache.h"\r
-#include "gdb_string.h"\r
-#include "gdb_assert.h"\r
-#include "gdbcore.h" /* for write_memory_unsigned_integer */\r
-#include "value.h"\r
-#include "gdbtypes.h"\r
-#include "frame.h"\r
-#include "frame-unwind.h"\r
-#include "frame-base.h"\r
-#include "trad-frame.h"\r
-#include "symtab.h"\r
-#include "dwarf2-frame.h"\r
-#include "regcache.h"\r
-\r
-#include "mn10300-tdep.h"\r
-\r
-\r
-/* Compute the alignment required by a type. */\r
-\r
-static int\r
-mn10300_type_align (struct type *type)\r
-{\r
- int i, align = 1;\r
-\r
- switch (TYPE_CODE (type))\r
- {\r
- case TYPE_CODE_INT:\r
- case TYPE_CODE_ENUM:\r
- case TYPE_CODE_SET:\r
- case TYPE_CODE_RANGE:\r
- case TYPE_CODE_CHAR:\r
- case TYPE_CODE_BOOL:\r
- case TYPE_CODE_FLT:\r
- case TYPE_CODE_PTR:\r
- case TYPE_CODE_REF:\r
- return TYPE_LENGTH (type);\r
-\r
- case TYPE_CODE_COMPLEX:\r
- return TYPE_LENGTH (type) / 2;\r
-\r
- case TYPE_CODE_STRUCT:\r
- case TYPE_CODE_UNION:\r
- for (i = 0; i < TYPE_NFIELDS (type); i++)\r
- {\r
- int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));\r
- while (align < falign)\r
- align <<= 1;\r
- }\r
- return align;\r
-\r
- case TYPE_CODE_ARRAY:\r
- /* HACK! Structures containing arrays, even small ones, are not\r
- elligible for returning in registers. */\r
- return 256;\r
-\r
- case TYPE_CODE_TYPEDEF:\r
- return mn10300_type_align (check_typedef (type));\r
-\r
- default:\r
- internal_error (__FILE__, __LINE__, _("bad switch"));\r
- }\r
-}\r
-\r
-/* MVS note this is deprecated. */\r
-/* Should call_function allocate stack space for a struct return? */\r
-/* gcc_p unused */\r
-static int\r
-mn10300_use_struct_convention (int gcc_p, struct type *type)\r
-{\r
- /* Structures bigger than a pair of words can't be returned in\r
- registers. */\r
- if (TYPE_LENGTH (type) > 8)\r
- return 1;\r
-\r
- switch (TYPE_CODE (type))\r
- {\r
- case TYPE_CODE_STRUCT:\r
- case TYPE_CODE_UNION:\r
- /* Structures with a single field are handled as the field\r
- itself. */\r
- if (TYPE_NFIELDS (type) == 1)\r
- return mn10300_use_struct_convention (gcc_p, \r
- TYPE_FIELD_TYPE (type, 0));\r
-\r
- /* Structures with word or double-word size are passed in memory, as\r
- long as they require at least word alignment. */\r
- if (mn10300_type_align (type) >= 4)\r
- return 0;\r
-\r
- return 1;\r
-\r
- /* Arrays are addressable, so they're never returned in\r
- registers. This condition can only hold when the array is\r
- the only field of a struct or union. */\r
- case TYPE_CODE_ARRAY:\r
- return 1;\r
-\r
- case TYPE_CODE_TYPEDEF:\r
- return mn10300_use_struct_convention (gcc_p, check_typedef (type));\r
-\r
- default:\r
- return 0;\r
- }\r
-}\r
-\r
-/* MVS note this is deprecated. */\r
-static void\r
-mn10300_store_return_value (struct type *type,\r
- struct regcache *regcache, const void *valbuf)\r
-{\r
- struct gdbarch *gdbarch = get_regcache_arch (regcache);\r
- int len = TYPE_LENGTH (type);\r
- int reg, regsz;\r
- \r
- if (TYPE_CODE (type) == TYPE_CODE_PTR)\r
- reg = 4;\r
- else\r
- reg = 0;\r
-\r
- regsz = register_size (gdbarch, reg);\r
-\r
- if (len <= regsz)\r
- regcache_raw_write_part (regcache, reg, 0, len, valbuf);\r
- else if (len <= 2 * regsz)\r
- {\r
- regcache_raw_write (regcache, reg, valbuf);\r
- gdb_assert (regsz == register_size (gdbarch, reg + 1));\r
- regcache_raw_write_part (regcache, reg+1, 0,\r
- len - regsz, (char *) valbuf + regsz);\r
- }\r
- else\r
- internal_error (__FILE__, __LINE__,\r
- _("Cannot store return value %d bytes long."), len);\r
-}\r
-\r
-/* MVS note deprecated. */\r
-static void\r
-mn10300_extract_return_value (struct type *type,\r
- struct regcache *regcache, void *valbuf)\r
-{\r
- struct gdbarch *gdbarch = get_regcache_arch (regcache);\r
- char buf[MAX_REGISTER_SIZE];\r
- int len = TYPE_LENGTH (type);\r
- int reg, regsz;\r
-\r
- if (TYPE_CODE (type) == TYPE_CODE_PTR)\r
- reg = 4;\r
- else\r
- reg = 0;\r
-\r
- regsz = register_size (gdbarch, reg);\r
- if (len <= regsz)\r
- {\r
- regcache_raw_read (regcache, reg, buf);\r
- memcpy (valbuf, buf, len);\r
- }\r
- else if (len <= 2 * regsz)\r
- {\r
- regcache_raw_read (regcache, reg, buf);\r
- memcpy (valbuf, buf, regsz);\r
- gdb_assert (regsz == register_size (gdbarch, reg + 1));\r
- regcache_raw_read (regcache, reg + 1, buf);\r
- memcpy ((char *) valbuf + regsz, buf, len - regsz);\r
- }\r
- else\r
- internal_error (__FILE__, __LINE__,\r
- _("Cannot extract return value %d bytes long."), len);\r
-}\r
-\r
-static char *\r
-register_name (int reg, char **regs, long sizeof_regs)\r
-{\r
- if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))\r
- return NULL;\r
- else\r
- return regs[reg];\r
-}\r
-\r
-static const char *\r
-mn10300_generic_register_name (int reg)\r
-{\r
- static char *regs[] =\r
- { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",\r
- "sp", "pc", "mdr", "psw", "lir", "lar", "", "",\r
- "", "", "", "", "", "", "", "",\r
- "", "", "", "", "", "", "", "fp"\r
- };\r
- return register_name (reg, regs, sizeof regs);\r
-}\r
-\r
-\r
-static const char *\r
-am33_register_name (int reg)\r
-{\r
- static char *regs[] =\r
- { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",\r
- "sp", "pc", "mdr", "psw", "lir", "lar", "",\r
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",\r
- "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""\r
- };\r
- return register_name (reg, regs, sizeof regs);\r
-}\r
-\r
-\r
-static struct type *\r
-mn10300_register_type (struct gdbarch *gdbarch, int reg)\r
-{\r
- return builtin_type_int;\r
-}\r
-\r
-static CORE_ADDR\r
-mn10300_read_pc (ptid_t ptid)\r
-{\r
- return read_register_pid (E_PC_REGNUM, ptid);\r
-}\r
-\r
-static void\r
-mn10300_write_pc (CORE_ADDR val, ptid_t ptid)\r
-{\r
- return write_register_pid (E_PC_REGNUM, val, ptid);\r
-}\r
-\r
-/* The breakpoint instruction must be the same size as the smallest\r
- instruction in the instruction set.\r
-\r
- The Matsushita mn10x00 processors have single byte instructions\r
- so we need a single byte breakpoint. Matsushita hasn't defined\r
- one, so we defined it ourselves. */\r
-\r
-const static unsigned char *\r
-mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)\r
-{\r
- static char breakpoint[] = {0xff};\r
- *bp_size = 1;\r
- return breakpoint;\r
-}\r
-\r
-/* Function: skip_prologue\r
- Return the address of the first inst past the prologue of the function. */\r
-\r
-static CORE_ADDR\r
-mn10300_skip_prologue (CORE_ADDR pc)\r
-{\r
- /* FIXME: not implemented. */\r
- /* First approximation, try simply using skip_prologue_using_sal. */\r
- return skip_prologue_using_sal (pc);\r
-}\r
-\r
-/* Simple frame_unwind_cache. \r
- This finds the "extra info" for the frame. */\r
-struct trad_frame_cache *\r
-mn10300_frame_unwind_cache (struct frame_info *next_frame,\r
- void **this_prologue_cache)\r
-{\r
- struct trad_frame_cache *cache;\r
- CORE_ADDR pc;\r
-\r
- if (*this_prologue_cache)\r
- return (*this_prologue_cache);\r
-\r
- cache = trad_frame_cache_zalloc (next_frame);\r
- pc = gdbarch_unwind_pc (current_gdbarch, next_frame);\r
- mn10300_analyze_prologue (next_frame, (void **) &cache, pc);\r
-\r
- trad_frame_set_id (cache, \r
- frame_id_build (trad_frame_get_this_base (cache), pc));\r
-\r
- (*this_prologue_cache) = cache;\r
- return cache;\r
-}\r
-\r
-/* Here is a dummy implementation. */\r
-static struct frame_id\r
-mn10300_unwind_dummy_id (struct gdbarch *gdbarch,\r
- struct frame_info *next_frame)\r
-{\r
- return frame_id_build (frame_sp_unwind (next_frame), \r
- frame_pc_unwind (next_frame));\r
-}\r
-\r
-/* Trad frame implementation. */\r
-static void\r
-mn10300_frame_this_id (struct frame_info *next_frame,\r
- void **this_prologue_cache,\r
- struct frame_id *this_id)\r
-{\r
- struct trad_frame_cache *cache = \r
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);\r
-\r
- trad_frame_get_id (cache, this_id);\r
-}\r
-\r
-static void\r
-mn10300_frame_prev_register (struct frame_info *next_frame,\r
- void **this_prologue_cache,\r
- int regnum, int *optimizedp,\r
- enum lval_type *lvalp, CORE_ADDR *addrp,\r
- int *realnump, void *bufferp)\r
-{\r
- struct trad_frame_cache *cache =\r
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);\r
-\r
- trad_frame_get_register (cache, next_frame, regnum, optimizedp, \r
- lvalp, addrp, realnump, bufferp);\r
- /* Or...\r
- trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum, \r
- optimizedp, lvalp, addrp, realnump, bufferp);\r
- */\r
-}\r
-\r
-static const struct frame_unwind mn10300_frame_unwind = {\r
- NORMAL_FRAME,\r
- mn10300_frame_this_id, \r
- mn10300_frame_prev_register\r
-};\r
-\r
-static CORE_ADDR\r
-mn10300_frame_base_address (struct frame_info *next_frame,\r
- void **this_prologue_cache)\r
-{\r
- struct trad_frame_cache *cache = \r
- mn10300_frame_unwind_cache (next_frame, this_prologue_cache);\r
-\r
- return trad_frame_get_this_base (cache);\r
-}\r
-\r
-static const struct frame_unwind *\r
-mn10300_frame_sniffer (struct frame_info *next_frame)\r
-{\r
- return &mn10300_frame_unwind;\r
-}\r
-\r
-static const struct frame_base mn10300_frame_base = {\r
- &mn10300_frame_unwind, \r
- mn10300_frame_base_address, \r
- mn10300_frame_base_address,\r
- mn10300_frame_base_address\r
-};\r
-\r
-static CORE_ADDR\r
-mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)\r
-{\r
- ULONGEST pc;\r
-\r
- frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc);\r
- return pc;\r
-}\r
-\r
-static CORE_ADDR\r
-mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)\r
-{\r
- ULONGEST sp;\r
-\r
- frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp);\r
- return sp;\r
-}\r
-\r
-static void\r
-mn10300_frame_unwind_init (struct gdbarch *gdbarch)\r
-{\r
- frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);\r
- frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);\r
- frame_base_set_default (gdbarch, &mn10300_frame_base);\r
- set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);\r
- set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);\r
- set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);\r
-}\r
-\r
-/* Function: push_dummy_call\r
- *\r
- * Set up machine state for a target call, including\r
- * function arguments, stack, return address, etc.\r
- *\r
- */\r
-\r
-static CORE_ADDR\r
-mn10300_push_dummy_call (struct gdbarch *gdbarch, \r
- struct value *target_func,\r
- struct regcache *regcache,\r
- CORE_ADDR bp_addr, \r
- int nargs, struct value **args,\r
- CORE_ADDR sp, \r
- int struct_return,\r
- CORE_ADDR struct_addr)\r
-{\r
- const int push_size = register_size (gdbarch, E_PC_REGNUM);\r
- int regs_used = struct_return ? 1 : 0;\r
- int len, arg_len; \r
- int stack_offset = 0;\r
- int argnum;\r
- char *val;\r
-\r
- /* FIXME temp, don't handle struct args at all. */\r
- if (struct_return)\r
- error ("Target doesn't handle struct return");\r
-\r
- /* This should be a nop, but align the stack just in case something\r
- went wrong. Stacks are four byte aligned on the mn10300. */\r
- sp &= ~3;\r
-\r
- /* Now make space on the stack for the args.\r
-\r
- XXX This doesn't appear to handle pass-by-invisible reference\r
- arguments. */\r
- for (len = 0, argnum = 0; argnum < nargs; argnum++)\r
- {\r
- arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;\r
- if (TYPE_CODE (value_type (args[argnum])) == TYPE_CODE_STRUCT)\r
- error ("Target does not handle struct args");\r
- while (regs_used < 2 && arg_len > 0)\r
- {\r
- regs_used++;\r
- arg_len -= push_size;\r
- }\r
- len += arg_len;\r
- }\r
-\r
- /* Allocate stack space. */\r
- sp -= len;\r
-\r
- regs_used = struct_return ? 1 : 0;\r
- /* Push all arguments onto the stack. */\r
- for (argnum = 0; argnum < nargs; argnum++)\r
- {\r
- /* FIXME what about structs? */\r
- arg_len = TYPE_LENGTH (value_type (*args));\r
- val = (char *) value_contents (*args);\r
-\r
- while (regs_used < 2 && arg_len > 0)\r
- {\r
- write_register (regs_used, extract_unsigned_integer (val, \r
- push_size));\r
- val += push_size;\r
- arg_len -= push_size;\r
- regs_used++;\r
- }\r
-\r
- while (arg_len > 0)\r
- {\r
- write_memory (sp + stack_offset, val, push_size);\r
- arg_len -= push_size;\r
- val += push_size;\r
- stack_offset += push_size;\r
- }\r
-\r
- args++;\r
- }\r
-\r
- /* Make space for the flushback area. */\r
- sp -= 8;\r
-\r
- /* Push the return address that contains the magic breakpoint. */\r
- sp -= 4;\r
- write_memory_unsigned_integer (sp, push_size, bp_addr);\r
- /* Update $sp. */\r
- regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);\r
- return sp;\r
-}\r
-\r
-\r
-static struct gdbarch *\r
-mn10300_gdbarch_init (struct gdbarch_info info,\r
- struct gdbarch_list *arches)\r
-{\r
- struct gdbarch *gdbarch;\r
- struct gdbarch_tdep *tdep;\r
-\r
- arches = gdbarch_list_lookup_by_info (arches, &info);\r
- if (arches != NULL)\r
- return arches->gdbarch;\r
-\r
- tdep = xmalloc (sizeof (struct gdbarch_tdep));\r
- gdbarch = gdbarch_alloc (&info, tdep);\r
-\r
- switch (info.bfd_arch_info->mach)\r
- {\r
- case 0:\r
- case bfd_mach_mn10300:\r
- set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);\r
- tdep->am33_mode = 0;\r
- break;\r
- case bfd_mach_am33:\r
- set_gdbarch_register_name (gdbarch, am33_register_name);\r
- tdep->am33_mode = 1;\r
- break;\r
- default:\r
- internal_error (__FILE__, __LINE__,\r
- _("mn10300_gdbarch_init: Unknown mn10300 variant"));\r
- break;\r
- }\r
-\r
- /* Registers. */\r
- set_gdbarch_num_regs (gdbarch, E_NUM_REGS);\r
- set_gdbarch_register_type (gdbarch, mn10300_register_type);\r
- set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);\r
- set_gdbarch_read_pc (gdbarch, mn10300_read_pc);\r
- set_gdbarch_write_pc (gdbarch, mn10300_write_pc);\r
- set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);\r
- set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);\r
-\r
- /* Stack unwinding. */\r
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);\r
- /* Breakpoints. */\r
- set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);\r
- /* decr_pc_after_break? */\r
- /* Disassembly. */\r
- set_gdbarch_print_insn (gdbarch, print_insn_mn10300);\r
-\r
- /* Stage 2 */\r
- /* MVS Note: at least the first one is deprecated! */\r
- set_gdbarch_deprecated_use_struct_convention (gdbarch, \r
- mn10300_use_struct_convention);\r
- set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value);\r
- set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value);\r
- \r
- /* Stage 3 -- get target calls working. */\r
- set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);\r
- /* set_gdbarch_return_value (store, extract) */\r
-\r
-\r
- mn10300_frame_unwind_init (gdbarch);\r
-\r
- return gdbarch;\r
-}\r
- \r
-/* Dump out the mn10300 specific architecture information. */\r
-\r
-static void\r
-mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)\r
-{\r
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);\r
- fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",\r
- tdep->am33_mode);\r
-}\r
-\r
-void\r
-_initialize_mn10300_tdep (void)\r
-{\r
- gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);\r
-}\r
-\r
+/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
+
+ Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 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. */
+
+/* MVS Notes:
+
+ To get from 1.1 to 1.2, add:
+ use_struct_convention
+ store_return_value
+ extract_return_value
+ extract_struct_value_address
+
+ Make sure to use regcache. */
+
+/* MVS Notes:
+
+ Apparently cannot run without a stub placeholder for unwind_dummy_id.
+*/
+
+/* MVS Notes:
+
+ To get from 1.2 to 1.3, add:
+ read_pc, write_pc
+ frame_unwind_init
+ struct mn10300_unwind_cache
+ unwind_pc
+ unwind_dummy_id
+ frame_this_id
+ frame_prev_register
+ frame_sniffer (struct mn10300_frame_unwind)
+*/
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "gdbcore.h" /* for write_memory_unsigned_integer */
+#include "value.h"
+#include "gdbtypes.h"
+#include "frame.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "trad-frame.h"
+#include "symtab.h"
+#include "dwarf2-frame.h"
+#include "regcache.h"
+
+#include "mn10300-tdep.h"
+
+
+/* Compute the alignment required by a type. */
+
+static int
+mn10300_type_align (struct type *type)
+{
+ int i, align = 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ return TYPE_LENGTH (type);
+
+ case TYPE_CODE_COMPLEX:
+ return TYPE_LENGTH (type) / 2;
+
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
+ while (align < falign)
+ align <<= 1;
+ }
+ return align;
+
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ elligible for returning in registers. */
+ return 256;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
+
+ default:
+ internal_error (__FILE__, __LINE__, _("bad switch"));
+ }
+}
+
+/* MVS note this is deprecated. */
+/* Should call_function allocate stack space for a struct return? */
+/* gcc_p unused */
+static int
+mn10300_use_struct_convention (int gcc_p, struct type *type)
+{
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ /* Structures with a single field are handled as the field
+ itself. */
+ if (TYPE_NFIELDS (type) == 1)
+ return mn10300_use_struct_convention (gcc_p,
+ TYPE_FIELD_TYPE (type, 0));
+
+ /* Structures with word or double-word size are passed in memory, as
+ long as they require at least word alignment. */
+ if (mn10300_type_align (type) >= 4)
+ return 0;
+
+ return 1;
+
+ /* Arrays are addressable, so they're never returned in
+ registers. This condition can only hold when the array is
+ the only field of a struct or union. */
+ case TYPE_CODE_ARRAY:
+ return 1;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_use_struct_convention (gcc_p, check_typedef (type));
+
+ default:
+ return 0;
+ }
+}
+
+/* MVS note this is deprecated. */
+static void
+mn10300_store_return_value (struct type *type,
+ struct regcache *regcache, const void *valbuf)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+
+ if (len <= regsz)
+ regcache_raw_write_part (regcache, reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_write (regcache, reg, valbuf);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_write_part (regcache, reg+1, 0,
+ len - regsz, (char *) valbuf + regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value %d bytes long."), len);
+}
+
+/* MVS note deprecated. */
+static void
+mn10300_extract_return_value (struct type *type,
+ struct regcache *regcache, void *valbuf)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ char buf[MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+ if (len <= regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, len);
+ }
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, regsz);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_read (regcache, reg + 1, buf);
+ memcpy ((char *) valbuf + regsz, buf, len - regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value %d bytes long."), len);
+}
+
+static char *
+register_name (int reg, char **regs, long sizeof_regs)
+{
+ if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
+ return NULL;
+ else
+ return regs[reg];
+}
+
+static const char *
+mn10300_generic_register_name (int reg)
+{
+ static char *regs[] =
+ { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "fp"
+ };
+ return register_name (reg, regs, sizeof regs);
+}
+
+
+static const char *
+am33_register_name (int reg)
+{
+ static char *regs[] =
+ { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "",
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
+ };
+ return register_name (reg, regs, sizeof regs);
+}
+
+
+static struct type *
+mn10300_register_type (struct gdbarch *gdbarch, int reg)
+{
+ return builtin_type_int;
+}
+
+static CORE_ADDR
+mn10300_read_pc (ptid_t ptid)
+{
+ return read_register_pid (E_PC_REGNUM, ptid);
+}
+
+static void
+mn10300_write_pc (CORE_ADDR val, ptid_t ptid)
+{
+ return write_register_pid (E_PC_REGNUM, val, ptid);
+}
+
+/* The breakpoint instruction must be the same size as the smallest
+ instruction in the instruction set.
+
+ The Matsushita mn10x00 processors have single byte instructions
+ so we need a single byte breakpoint. Matsushita hasn't defined
+ one, so we defined it ourselves. */
+
+const static unsigned char *
+mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+{
+ static char breakpoint[] = {0xff};
+ *bp_size = 1;
+ return breakpoint;
+}
+
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
+
+static CORE_ADDR
+mn10300_skip_prologue (CORE_ADDR pc)
+{
+ /* FIXME: not implemented. */
+ /* First approximation, try simply using skip_prologue_using_sal. */
+ return skip_prologue_using_sal (pc);
+}
+
+/* Simple frame_unwind_cache.
+ This finds the "extra info" for the frame. */
+struct trad_frame_cache *
+mn10300_frame_unwind_cache (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct trad_frame_cache *cache;
+ CORE_ADDR pc;
+
+ if (*this_prologue_cache)
+ return (*this_prologue_cache);
+
+ cache = trad_frame_cache_zalloc (next_frame);
+ pc = gdbarch_unwind_pc (current_gdbarch, next_frame);
+ mn10300_analyze_prologue (next_frame, (void **) &cache, pc);
+
+ trad_frame_set_id (cache,
+ frame_id_build (trad_frame_get_this_base (cache),
+ frame_func_unwind (next_frame)));
+
+ (*this_prologue_cache) = cache;
+ return cache;
+}
+
+/* Here is a dummy implementation. */
+static struct frame_id
+mn10300_unwind_dummy_id (struct gdbarch *gdbarch,
+ struct frame_info *next_frame)
+{
+ return frame_id_build (frame_sp_unwind (next_frame),
+ frame_pc_unwind (next_frame));
+}
+
+/* Trad frame implementation. */
+static void
+mn10300_frame_this_id (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ trad_frame_get_id (cache, this_id);
+}
+
+static void
+mn10300_frame_prev_register (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *bufferp)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ trad_frame_get_register (cache, next_frame, regnum, optimizedp,
+ lvalp, addrp, realnump, bufferp);
+ /* Or...
+ trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, bufferp);
+ */
+}
+
+static const struct frame_unwind mn10300_frame_unwind = {
+ NORMAL_FRAME,
+ mn10300_frame_this_id,
+ mn10300_frame_prev_register
+};
+
+static CORE_ADDR
+mn10300_frame_base_address (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ return trad_frame_get_this_base (cache);
+}
+
+static const struct frame_unwind *
+mn10300_frame_sniffer (struct frame_info *next_frame)
+{
+ return &mn10300_frame_unwind;
+}
+
+static const struct frame_base mn10300_frame_base = {
+ &mn10300_frame_unwind,
+ mn10300_frame_base_address,
+ mn10300_frame_base_address,
+ mn10300_frame_base_address
+};
+
+static CORE_ADDR
+mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST pc;
+
+ frame_unwind_unsigned_register (next_frame, E_PC_REGNUM, &pc);
+ return pc;
+}
+
+static CORE_ADDR
+mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST sp;
+
+ frame_unwind_unsigned_register (next_frame, E_SP_REGNUM, &sp);
+ return sp;
+}
+
+static void
+mn10300_frame_unwind_init (struct gdbarch *gdbarch)
+{
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);
+ frame_base_set_default (gdbarch, &mn10300_frame_base);
+ set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
+}
+
+/* Function: push_dummy_call
+ *
+ * Set up machine state for a target call, including
+ * function arguments, stack, return address, etc.
+ *
+ */
+
+static CORE_ADDR
+mn10300_push_dummy_call (struct gdbarch *gdbarch,
+ struct value *target_func,
+ struct regcache *regcache,
+ CORE_ADDR bp_addr,
+ int nargs, struct value **args,
+ CORE_ADDR sp,
+ int struct_return,
+ CORE_ADDR struct_addr)
+{
+ const int push_size = register_size (gdbarch, E_PC_REGNUM);
+ int regs_used = struct_return ? 1 : 0;
+ int len, arg_len;
+ int stack_offset = 0;
+ int argnum;
+ char *val;
+
+ /* FIXME temp, don't handle struct args at all. */
+ if (struct_return)
+ error ("Target doesn't handle struct return");
+
+ /* This should be a nop, but align the stack just in case something
+ went wrong. Stacks are four byte aligned on the mn10300. */
+ sp &= ~3;
+
+ /* Now make space on the stack for the args.
+
+ XXX This doesn't appear to handle pass-by-invisible reference
+ arguments. */
+ for (len = 0, argnum = 0; argnum < nargs; argnum++)
+ {
+ arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
+ if (TYPE_CODE (value_type (args[argnum])) == TYPE_CODE_STRUCT)
+ error ("Target does not handle struct args");
+ while (regs_used < 2 && arg_len > 0)
+ {
+ regs_used++;
+ arg_len -= push_size;
+ }
+ len += arg_len;
+ }
+
+ /* Allocate stack space. */
+ sp -= len;
+
+ regs_used = struct_return ? 1 : 0;
+ /* Push all arguments onto the stack. */
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ /* FIXME what about structs? */
+ arg_len = TYPE_LENGTH (value_type (*args));
+ val = (char *) value_contents (*args);
+
+ while (regs_used < 2 && arg_len > 0)
+ {
+ write_register (regs_used, extract_unsigned_integer (val,
+ push_size));
+ val += push_size;
+ arg_len -= push_size;
+ regs_used++;
+ }
+
+ while (arg_len > 0)
+ {
+ write_memory (sp + stack_offset, val, push_size);
+ arg_len -= push_size;
+ val += push_size;
+ stack_offset += push_size;
+ }
+
+ args++;
+ }
+
+ /* Make space for the flushback area. */
+ sp -= 8;
+
+ /* Push the return address that contains the magic breakpoint. */
+ sp -= 4;
+ write_memory_unsigned_integer (sp, push_size, bp_addr);
+ /* Update $sp. */
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
+ return sp;
+}
+
+
+static struct gdbarch *
+mn10300_gdbarch_init (struct gdbarch_info info,
+ struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ struct gdbarch_tdep *tdep;
+
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ switch (info.bfd_arch_info->mach)
+ {
+ case 0:
+ case bfd_mach_mn10300:
+ set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
+ tdep->am33_mode = 0;
+ break;
+ case bfd_mach_am33:
+ set_gdbarch_register_name (gdbarch, am33_register_name);
+ tdep->am33_mode = 1;
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("mn10300_gdbarch_init: Unknown mn10300 variant"));
+ break;
+ }
+
+ /* Registers. */
+ set_gdbarch_num_regs (gdbarch, E_NUM_REGS);
+ set_gdbarch_register_type (gdbarch, mn10300_register_type);
+ set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
+ set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
+ set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
+
+ /* Stack unwinding. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ /* Breakpoints. */
+ set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
+ /* decr_pc_after_break? */
+ /* Disassembly. */
+ set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
+
+ /* Stage 2 */
+ /* MVS Note: at least the first one is deprecated! */
+ set_gdbarch_deprecated_use_struct_convention (gdbarch,
+ mn10300_use_struct_convention);
+ set_gdbarch_store_return_value (gdbarch, mn10300_store_return_value);
+ set_gdbarch_extract_return_value (gdbarch, mn10300_extract_return_value);
+
+ /* Stage 3 -- get target calls working. */
+ set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
+ /* set_gdbarch_return_value (store, extract) */
+
+
+ mn10300_frame_unwind_init (gdbarch);
+
+ return gdbarch;
+}
+
+/* Dump out the mn10300 specific architecture information. */
+
+static void
+mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
+ tdep->am33_mode);
+}
+
+void
+_initialize_mn10300_tdep (void)
+{
+ gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
+}
+
projects / external / binutils.git / commitdiff