| /* Target-dependent code for the Sanyo Xstormy16a (LC590000) processor. |
| |
| Copyright (C) 2001-2021 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "frame-base.h" |
| #include "frame-unwind.h" |
| #include "dwarf2/frame.h" |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "gdbcmd.h" |
| #include "gdbcore.h" |
| #include "value.h" |
| #include "dis-asm.h" |
| #include "inferior.h" |
| #include "arch-utils.h" |
| #include "regcache.h" |
| #include "osabi.h" |
| #include "objfiles.h" |
| #include "gdbsupport/byte-vector.h" |
| |
| 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 implicitly 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 |
| }; |
| |
| /* Use an invalid address value as 'not available' marker. */ |
| enum { REG_UNAVAIL = (CORE_ADDR) -1 }; |
| |
| struct xstormy16_frame_cache |
| { |
| /* Base address. */ |
| CORE_ADDR base; |
| CORE_ADDR pc; |
| LONGEST framesize; |
| int uses_fp; |
| CORE_ADDR saved_regs[E_NUM_REGS]; |
| CORE_ADDR saved_sp; |
| }; |
| |
| /* 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) |
| }; |
| |
| /* Function: xstormy16_register_name |
| Returns the name of the standard Xstormy16 register N. */ |
| |
| static const char * |
| xstormy16_register_name (struct gdbarch *gdbarch, int regnum) |
| { |
| static const char *register_names[] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| "r8", "r9", "r10", "r11", "r12", "r13", |
| "psw", "sp", "pc" |
| }; |
| |
| if (regnum < 0 || regnum >= E_NUM_REGS) |
| internal_error (__FILE__, __LINE__, |
| _("xstormy16_register_name: illegal register number %d"), |
| regnum); |
| else |
| return register_names[regnum]; |
| |
| } |
| |
| static struct type * |
| xstormy16_register_type (struct gdbarch *gdbarch, int regnum) |
| { |
| if (regnum == E_PC_REGNUM) |
| return builtin_type (gdbarch)->builtin_uint32; |
| else |
| return builtin_type (gdbarch)->builtin_uint16; |
| } |
| |
| /* 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 (t->code () != TYPE_CODE_STRUCT |
| && t->code () != TYPE_CODE_UNION |
| && t->code () != TYPE_CODE_ARRAY); |
| } |
| |
| /* 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 (struct type *type) |
| { |
| return !xstormy16_type_is_scalar (type) |
| || TYPE_LENGTH (type) > E_MAX_RETTYPE_SIZE_IN_REGS; |
| } |
| |
| /* Function: xstormy16_extract_return_value |
| Find a function's return value in the appropriate registers (in |
| regbuf), and copy it into valbuf. */ |
| |
| static void |
| xstormy16_extract_return_value (struct type *type, struct regcache *regcache, |
| gdb_byte *valbuf) |
| { |
| int len = TYPE_LENGTH (type); |
| int i, regnum = E_1ST_ARG_REGNUM; |
| |
| for (i = 0; i < len; i += xstormy16_reg_size) |
| regcache->raw_read (regnum++, valbuf + i); |
| } |
| |
| /* 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, struct regcache *regcache, |
| const gdb_byte *valbuf) |
| { |
| if (TYPE_LENGTH (type) == 1) |
| { |
| /* Add leading zeros to the value. */ |
| gdb_byte buf[xstormy16_reg_size]; |
| memset (buf, 0, xstormy16_reg_size); |
| memcpy (buf, valbuf, 1); |
| regcache->raw_write (E_1ST_ARG_REGNUM, buf); |
| } |
| else |
| { |
| int len = TYPE_LENGTH (type); |
| int i, regnum = E_1ST_ARG_REGNUM; |
| |
| for (i = 0; i < len; i += xstormy16_reg_size) |
| regcache->raw_write (regnum++, valbuf + i); |
| } |
| } |
| |
| static enum return_value_convention |
| xstormy16_return_value (struct gdbarch *gdbarch, struct value *function, |
| struct type *type, struct regcache *regcache, |
| gdb_byte *readbuf, const gdb_byte *writebuf) |
| { |
| if (xstormy16_use_struct_convention (type)) |
| return RETURN_VALUE_STRUCT_CONVENTION; |
| if (writebuf) |
| xstormy16_store_return_value (type, regcache, writebuf); |
| else if (readbuf) |
| xstormy16_extract_return_value (type, regcache, readbuf); |
| return RETURN_VALUE_REGISTER_CONVENTION; |
| } |
| |
| static CORE_ADDR |
| xstormy16_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| { |
| if (addr & 1) |
| ++addr; |
| return addr; |
| } |
| |
| /* Function: xstormy16_push_dummy_call |
| 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_dummy_call (struct gdbarch *gdbarch, |
| struct value *function, |
| struct regcache *regcache, |
| CORE_ADDR bp_addr, int nargs, |
| struct value **args, |
| CORE_ADDR sp, |
| function_call_return_method return_method, |
| CORE_ADDR struct_addr) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| CORE_ADDR stack_dest = sp; |
| int argreg = E_1ST_ARG_REGNUM; |
| int i, j; |
| int typelen, slacklen; |
| gdb_byte buf[xstormy16_pc_size]; |
| |
| /* If returning a struct using target ABI method, then the struct return |
| address will consume one argument-passing register. */ |
| if (return_method == return_method_struct) |
| { |
| regcache_cooked_write_unsigned (regcache, E_PTR_RET_REGNUM, struct_addr); |
| 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. */ |
| const gdb_byte *val = value_contents (args[i]); |
| for (j = 0; j < typelen; j += xstormy16_reg_size) |
| { |
| ULONGEST regval; |
| int size = (typelen - j == 1) ? 1 : xstormy16_reg_size; |
| |
| regval = extract_unsigned_integer (val + j, size, byte_order); |
| regcache_cooked_write_unsigned (regcache, argreg++, regval); |
| } |
| } |
| |
| /* Align SP */ |
| stack_dest = xstormy16_frame_align (gdbarch, stack_dest); |
| |
| /* Loop backwards through remaining arguments and push them on the stack, |
| wordaligned. */ |
| for (j = nargs - 1; j >= i; j--) |
| { |
| const gdb_byte *bytes = value_contents (args[j]); |
| |
| typelen = TYPE_LENGTH (value_enclosing_type (args[j])); |
| slacklen = typelen & 1; |
| gdb::byte_vector val (typelen + slacklen); |
| memcpy (val.data (), bytes, typelen); |
| memset (val.data () + typelen, 0, slacklen); |
| |
| /* Now write this data to the stack. The stack grows upwards. */ |
| write_memory (stack_dest, val.data (), typelen + slacklen); |
| stack_dest += typelen + slacklen; |
| } |
| |
| store_unsigned_integer (buf, xstormy16_pc_size, byte_order, bp_addr); |
| write_memory (stack_dest, buf, xstormy16_pc_size); |
| stack_dest += xstormy16_pc_size; |
| |
| /* Update stack pointer. */ |
| regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, stack_dest); |
| |
| /* Return the new stack pointer minus the return address slot since |
| that's what DWARF2/GCC uses as the frame's CFA. */ |
| return stack_dest - xstormy16_pc_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_analyze_prologue (struct gdbarch *gdbarch, |
| CORE_ADDR start_addr, CORE_ADDR end_addr, |
| struct xstormy16_frame_cache *cache, |
| struct frame_info *this_frame) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| CORE_ADDR next_addr; |
| ULONGEST inst, inst2; |
| LONGEST offset; |
| int regnum; |
| |
| /* Initialize framesize with size of PC put on stack by CALLF inst. */ |
| cache->saved_regs[E_PC_REGNUM] = 0; |
| cache->framesize = xstormy16_pc_size; |
| |
| if (start_addr >= end_addr) |
| return end_addr; |
| |
| for (next_addr = start_addr; |
| next_addr < end_addr; next_addr += xstormy16_inst_size) |
| { |
| inst = read_memory_unsigned_integer (next_addr, |
| xstormy16_inst_size, byte_order); |
| inst2 = read_memory_unsigned_integer (next_addr + xstormy16_inst_size, |
| xstormy16_inst_size, byte_order); |
| |
| if (inst >= 0x0082 && inst <= 0x008d) /* push r2 .. push r13 */ |
| { |
| regnum = inst & 0x000f; |
| cache->saved_regs[regnum] = cache->framesize; |
| cache->framesize += xstormy16_reg_size; |
| } |
| |
| /* Optional stack allocation for args and local vars <= 4 byte. */ |
| else if (inst == 0x301f || inst == 0x303f) /* inc r15, #0x1/#0x3 */ |
| { |
| cache->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 */ |
| { |
| cache->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 */ |
| { |
| cache->framesize += inst2; |
| next_addr += xstormy16_inst_size; |
| } |
| |
| else if (inst == 0x46fd) /* mov r13, r15 */ |
| { |
| cache->uses_fp = 1; |
| } |
| |
| /* 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) >= 0x000a && (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) |
| { |
| 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; |
| |
| cache->saved_regs[regnum] = cache->framesize + offset; |
| next_addr += xstormy16_inst_size; |
| } |
| |
| else /* Not a prologue instruction. */ |
| break; |
| } |
| |
| 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 (struct gdbarch *gdbarch, CORE_ADDR pc) |
| { |
| CORE_ADDR func_addr = 0, func_end = 0; |
| const char *func_name; |
| |
| if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) |
| { |
| struct symtab_and_line sal; |
| struct symbol *sym; |
| struct xstormy16_frame_cache cache; |
| CORE_ADDR plg_end; |
| |
| memset (&cache, 0, sizeof cache); |
| |
| /* Don't trust line number debug info in frameless functions. */ |
| plg_end = xstormy16_analyze_prologue (gdbarch, func_addr, func_end, |
| &cache, NULL); |
| if (!cache.uses_fp) |
| return plg_end; |
| |
| /* Found a function. */ |
| sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL).symbol; |
| /* Don't use line number debug info for assembly source files. */ |
| if (sym && sym->language () != language_asm) |
| { |
| 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 result of prologue parsing method. */ |
| return plg_end; |
| } |
| |
| /* No function symbol -- just return the PC. */ |
| |
| return (CORE_ADDR) pc; |
| } |
| |
| /* Implement the stack_frame_destroyed_p gdbarch method. |
| |
| 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_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| CORE_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, byte_order); |
| if (inst != 0x0003) |
| return 0; |
| |
| while ((addr -= xstormy16_inst_size) >= func_addr) |
| { |
| inst = read_memory_unsigned_integer (addr, |
| xstormy16_inst_size, |
| byte_order); |
| 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, |
| byte_order); |
| if (inst2 == 0x314f && inst >= 0x8000) /* add r15, neg. value */ |
| { |
| addr -= xstormy16_inst_size; |
| break; |
| } |
| return 0; |
| } |
| if (pc > addr) |
| return 1; |
| } |
| return 0; |
| } |
| |
| constexpr gdb_byte xstormy16_break_insn[] = { 0x06, 0x0 }; |
| |
| typedef BP_MANIPULATION (xstormy16_break_insn) xstormy16_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 (struct gdbarch *gdbarch, CORE_ADDR faddr) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| struct obj_section *faddr_sect = find_pc_section (faddr); |
| |
| if (faddr_sect) |
| { |
| LONGEST inst, inst2, addr; |
| gdb_byte 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, byte_order); |
| inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
| xstormy16_inst_size, byte_order); |
| 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 (struct gdbarch *gdbarch, CORE_ADDR faddr) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 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, endaddr; |
| |
| addr = osect->addr (); |
| endaddr = osect->endaddr (); |
| |
| for (; addr < endaddr; addr += 2 * xstormy16_inst_size) |
| { |
| LONGEST inst, inst2, faddr2; |
| gdb_byte buf[2 * xstormy16_inst_size]; |
| |
| if (target_read_memory (addr, buf, sizeof buf)) |
| return 0; |
| inst = extract_unsigned_integer (buf, |
| xstormy16_inst_size, |
| byte_order); |
| inst2 = extract_unsigned_integer (buf + xstormy16_inst_size, |
| xstormy16_inst_size, |
| byte_order); |
| faddr2 = inst2 << 8 | (inst & 0xff); |
| if (faddr == faddr2) |
| return addr; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static CORE_ADDR |
| xstormy16_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (frame); |
| CORE_ADDR tmp = xstormy16_resolve_jmp_table_entry (gdbarch, pc); |
| |
| if (tmp && tmp != pc) |
| return tmp; |
| return 0; |
| } |
| |
| /* Function pointers are 16 bit. The address space is 24 bit, using |
| 32 bit addresses. Pointers to functions on the XStormy16 are implemented |
| by using 16 bit pointers, which are either direct pointers in case the |
| function begins below 0x10000, or indirect pointers into a jump table. |
| The next two functions convert 16 bit pointers into 24 (32) bit addresses |
| and vice versa. */ |
| |
| static CORE_ADDR |
| xstormy16_pointer_to_address (struct gdbarch *gdbarch, |
| struct type *type, const gdb_byte *buf) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| enum type_code target = TYPE_TARGET_TYPE (type)->code (); |
| CORE_ADDR addr |
| = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); |
| |
| if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) |
| { |
| CORE_ADDR addr2 = xstormy16_resolve_jmp_table_entry (gdbarch, addr); |
| if (addr2) |
| addr = addr2; |
| } |
| |
| return addr; |
| } |
| |
| static void |
| xstormy16_address_to_pointer (struct gdbarch *gdbarch, |
| struct type *type, gdb_byte *buf, CORE_ADDR addr) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| enum type_code target = TYPE_TARGET_TYPE (type)->code (); |
| |
| if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD) |
| { |
| CORE_ADDR addr2 = xstormy16_find_jmp_table_entry (gdbarch, addr); |
| if (addr2) |
| addr = addr2; |
| } |
| store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr); |
| } |
| |
| static struct xstormy16_frame_cache * |
| xstormy16_alloc_frame_cache (void) |
| { |
| struct xstormy16_frame_cache *cache; |
| int i; |
| |
| cache = FRAME_OBSTACK_ZALLOC (struct xstormy16_frame_cache); |
| |
| cache->base = 0; |
| cache->saved_sp = 0; |
| cache->pc = 0; |
| cache->uses_fp = 0; |
| cache->framesize = 0; |
| for (i = 0; i < E_NUM_REGS; ++i) |
| cache->saved_regs[i] = REG_UNAVAIL; |
| |
| return cache; |
| } |
| |
| static struct xstormy16_frame_cache * |
| xstormy16_frame_cache (struct frame_info *this_frame, void **this_cache) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| struct xstormy16_frame_cache *cache; |
| CORE_ADDR current_pc; |
| int i; |
| |
| if (*this_cache) |
| return (struct xstormy16_frame_cache *) *this_cache; |
| |
| cache = xstormy16_alloc_frame_cache (); |
| *this_cache = cache; |
| |
| cache->base = get_frame_register_unsigned (this_frame, E_FP_REGNUM); |
| if (cache->base == 0) |
| return cache; |
| |
| cache->pc = get_frame_func (this_frame); |
| current_pc = get_frame_pc (this_frame); |
| if (cache->pc) |
| xstormy16_analyze_prologue (gdbarch, cache->pc, current_pc, |
| cache, this_frame); |
| |
| if (!cache->uses_fp) |
| cache->base = get_frame_register_unsigned (this_frame, E_SP_REGNUM); |
| |
| cache->saved_sp = cache->base - cache->framesize; |
| |
| for (i = 0; i < E_NUM_REGS; ++i) |
| if (cache->saved_regs[i] != REG_UNAVAIL) |
| cache->saved_regs[i] += cache->saved_sp; |
| |
| return cache; |
| } |
| |
| static struct value * |
| xstormy16_frame_prev_register (struct frame_info *this_frame, |
| void **this_cache, int regnum) |
| { |
| struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
| this_cache); |
| gdb_assert (regnum >= 0); |
| |
| if (regnum == E_SP_REGNUM && cache->saved_sp) |
| return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
| |
| if (regnum < E_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) |
| return frame_unwind_got_memory (this_frame, regnum, |
| cache->saved_regs[regnum]); |
| |
| return frame_unwind_got_register (this_frame, regnum, regnum); |
| } |
| |
| static void |
| xstormy16_frame_this_id (struct frame_info *this_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
| this_cache); |
| |
| /* This marks the outermost frame. */ |
| if (cache->base == 0) |
| return; |
| |
| *this_id = frame_id_build (cache->saved_sp, cache->pc); |
| } |
| |
| static CORE_ADDR |
| xstormy16_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| { |
| struct xstormy16_frame_cache *cache = xstormy16_frame_cache (this_frame, |
| this_cache); |
| return cache->base; |
| } |
| |
| static const struct frame_unwind xstormy16_frame_unwind = { |
| "xstormy16 prologue", |
| NORMAL_FRAME, |
| default_frame_unwind_stop_reason, |
| xstormy16_frame_this_id, |
| xstormy16_frame_prev_register, |
| NULL, |
| default_frame_sniffer |
| }; |
| |
| static const struct frame_base xstormy16_frame_base = { |
| &xstormy16_frame_unwind, |
| xstormy16_frame_base_address, |
| xstormy16_frame_base_address, |
| xstormy16_frame_base_address |
| }; |
| |
| /* 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) |
| { |
| 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); |
| |
| gdbarch = gdbarch_alloc (&info, NULL); |
| |
| /* |
| * Basic register fields and methods, datatype sizes and stuff. |
| */ |
| |
| 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_pc_regnum (gdbarch, E_PC_REGNUM); |
| set_gdbarch_register_name (gdbarch, xstormy16_register_name); |
| set_gdbarch_register_type (gdbarch, xstormy16_register_type); |
| |
| set_gdbarch_char_signed (gdbarch, 0); |
| set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| |
| set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_wchar_signed (gdbarch, 1); |
| |
| set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| |
| set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_dwarf2_addr_size (gdbarch, 4); |
| |
| set_gdbarch_address_to_pointer (gdbarch, xstormy16_address_to_pointer); |
| set_gdbarch_pointer_to_address (gdbarch, xstormy16_pointer_to_address); |
| |
| /* Stack grows up. */ |
| set_gdbarch_inner_than (gdbarch, core_addr_greaterthan); |
| |
| /* |
| * Frame Info |
| */ |
| set_gdbarch_frame_align (gdbarch, xstormy16_frame_align); |
| frame_base_set_default (gdbarch, &xstormy16_frame_base); |
| |
| set_gdbarch_skip_prologue (gdbarch, xstormy16_skip_prologue); |
| set_gdbarch_stack_frame_destroyed_p (gdbarch, |
| xstormy16_stack_frame_destroyed_p); |
| |
| /* These values and methods are used when gdb calls a target function. */ |
| set_gdbarch_push_dummy_call (gdbarch, xstormy16_push_dummy_call); |
| set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
| xstormy16_breakpoint::kind_from_pc); |
| set_gdbarch_sw_breakpoint_from_kind (gdbarch, |
| xstormy16_breakpoint::bp_from_kind); |
| set_gdbarch_return_value (gdbarch, xstormy16_return_value); |
| |
| set_gdbarch_skip_trampoline_code (gdbarch, xstormy16_skip_trampoline_code); |
| |
| gdbarch_init_osabi (info, gdbarch); |
| |
| dwarf2_append_unwinders (gdbarch); |
| frame_unwind_append_unwinder (gdbarch, &xstormy16_frame_unwind); |
| |
| return gdbarch; |
| } |
| |
| /* Function: _initialize_xstormy16_tdep |
| Initializer function for the Sanyo Xstormy16a module. |
| Called by gdb at start-up. */ |
| |
| void _initialize_xstormy16_tdep (); |
| void |
| _initialize_xstormy16_tdep () |
| { |
| register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init); |
| } |