| /* Target-dependent code for the Motorola 68000 series. |
| |
| Copyright (C) 1990-2024 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 "dwarf2/frame.h" |
| #include "extract-store-integer.h" |
| #include "frame.h" |
| #include "frame-base.h" |
| #include "frame-unwind.h" |
| #include "gdbtypes.h" |
| #include "symtab.h" |
| #include "gdbcore.h" |
| #include "value.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| #include "arch-utils.h" |
| #include "osabi.h" |
| #include "dis-asm.h" |
| #include "target-descriptions.h" |
| #include "floatformat.h" |
| #include "target-float.h" |
| #include "elf-bfd.h" |
| #include "elf/m68k.h" |
| |
| #include "m68k-tdep.h" |
| |
| |
| #define P_LINKL_FP 0x480e |
| #define P_LINKW_FP 0x4e56 |
| #define P_PEA_FP 0x4856 |
| #define P_MOVEAL_SP_FP 0x2c4f |
| #define P_ADDAW_SP 0xdefc |
| #define P_ADDAL_SP 0xdffc |
| #define P_SUBQW_SP 0x514f |
| #define P_SUBQL_SP 0x518f |
| #define P_LEA_SP_SP 0x4fef |
| #define P_LEA_PC_A5 0x4bfb0170 |
| #define P_FMOVEMX_SP 0xf227 |
| #define P_MOVEL_SP 0x2f00 |
| #define P_MOVEML_SP 0x48e7 |
| |
| /* Offset from SP to first arg on stack at first instruction of a function. */ |
| #define SP_ARG0 (1 * 4) |
| |
| #if !defined (BPT_VECTOR) |
| #define BPT_VECTOR 0xf |
| #endif |
| |
| constexpr gdb_byte m68k_break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
| |
| typedef BP_MANIPULATION (m68k_break_insn) m68k_breakpoint; |
| |
| |
| /* Construct types for ISA-specific registers. */ |
| static struct type * |
| m68k_ps_type (struct gdbarch *gdbarch) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (!tdep->m68k_ps_type) |
| { |
| struct type *type; |
| |
| type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 32); |
| append_flags_type_flag (type, 0, "C"); |
| append_flags_type_flag (type, 1, "V"); |
| append_flags_type_flag (type, 2, "Z"); |
| append_flags_type_flag (type, 3, "N"); |
| append_flags_type_flag (type, 4, "X"); |
| append_flags_type_flag (type, 8, "I0"); |
| append_flags_type_flag (type, 9, "I1"); |
| append_flags_type_flag (type, 10, "I2"); |
| append_flags_type_flag (type, 12, "M"); |
| append_flags_type_flag (type, 13, "S"); |
| append_flags_type_flag (type, 14, "T0"); |
| append_flags_type_flag (type, 15, "T1"); |
| |
| tdep->m68k_ps_type = type; |
| } |
| |
| return tdep->m68k_ps_type; |
| } |
| |
| static struct type * |
| m68881_ext_type (struct gdbarch *gdbarch) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (!tdep->m68881_ext_type) |
| { |
| type_allocator alloc (gdbarch); |
| tdep->m68881_ext_type |
| = init_float_type (alloc, -1, "builtin_type_m68881_ext", |
| floatformats_m68881_ext); |
| } |
| |
| return tdep->m68881_ext_type; |
| } |
| |
| /* Return the GDB type object for the "standard" data type of data in |
| register N. This should be int for D0-D7, SR, FPCONTROL and |
| FPSTATUS, long double for FP0-FP7, and void pointer for all others |
| (A0-A7, PC, FPIADDR). Note, for registers which contain |
| addresses return pointer to void, not pointer to char, because we |
| don't want to attempt to print the string after printing the |
| address. */ |
| |
| static struct type * |
| m68k_register_type (struct gdbarch *gdbarch, int regnum) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (tdep->fpregs_present) |
| { |
| if (regnum >= gdbarch_fp0_regnum (gdbarch) |
| && regnum <= gdbarch_fp0_regnum (gdbarch) + 7) |
| { |
| if (tdep->flavour == m68k_coldfire_flavour) |
| return builtin_type (gdbarch)->builtin_double; |
| else |
| return m68881_ext_type (gdbarch); |
| } |
| |
| if (regnum == M68K_FPI_REGNUM) |
| return builtin_type (gdbarch)->builtin_func_ptr; |
| |
| if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) |
| return builtin_type (gdbarch)->builtin_int32; |
| } |
| else |
| { |
| if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) |
| return builtin_type (gdbarch)->builtin_int0; |
| } |
| |
| if (regnum == gdbarch_pc_regnum (gdbarch)) |
| return builtin_type (gdbarch)->builtin_func_ptr; |
| |
| if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
| return builtin_type (gdbarch)->builtin_data_ptr; |
| |
| if (regnum == M68K_PS_REGNUM) |
| return m68k_ps_type (gdbarch); |
| |
| return builtin_type (gdbarch)->builtin_int32; |
| } |
| |
| static const char * const m68k_register_names[] = { |
| "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
| "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", |
| "ps", "pc", |
| "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", |
| "fpcontrol", "fpstatus", "fpiaddr" |
| }; |
| |
| /* Function: m68k_register_name |
| Returns the name of the standard m68k register regnum. */ |
| |
| static const char * |
| m68k_register_name (struct gdbarch *gdbarch, int regnum) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| static_assert (ARRAY_SIZE (m68k_register_names) == M68K_NUM_REGS); |
| if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM |
| && tdep->fpregs_present == 0) |
| return ""; |
| else |
| return m68k_register_names[regnum]; |
| } |
| |
| /* Return nonzero if a value of type TYPE stored in register REGNUM |
| needs any special handling. */ |
| |
| static int |
| m68k_convert_register_p (struct gdbarch *gdbarch, |
| int regnum, struct type *type) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (!tdep->fpregs_present) |
| return 0; |
| return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
| /* We only support floating-point values. */ |
| && type->code () == TYPE_CODE_FLT |
| && type != register_type (gdbarch, M68K_FP0_REGNUM)); |
| } |
| |
| /* Read a value of type TYPE from register REGNUM in frame FRAME, and |
| return its contents in TO. */ |
| |
| static int |
| m68k_register_to_value (const frame_info_ptr &frame, int regnum, |
| struct type *type, gdb_byte *to, |
| int *optimizedp, int *unavailablep) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (frame); |
| gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
| struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
| |
| gdb_assert (type->code () == TYPE_CODE_FLT); |
| |
| /* Convert to TYPE. */ |
| auto from_view |
| = gdb::make_array_view (from, register_size (gdbarch, regnum)); |
| frame_info_ptr next_frame = get_next_frame_sentinel_okay (frame); |
| if (!get_frame_register_bytes (next_frame, regnum, 0, from_view, optimizedp, |
| unavailablep)) |
| return 0; |
| |
| target_float_convert (from, fpreg_type, to, type); |
| *optimizedp = *unavailablep = 0; |
| return 1; |
| } |
| |
| /* Write the contents FROM of a value of type TYPE into register |
| REGNUM in frame FRAME. */ |
| |
| static void |
| m68k_value_to_register (const frame_info_ptr &frame, int regnum, |
| struct type *type, const gdb_byte *from) |
| { |
| gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
| gdbarch *arch = get_frame_arch (frame); |
| struct type *fpreg_type = register_type (arch, M68K_FP0_REGNUM); |
| |
| /* We only support floating-point values. */ |
| if (type->code () != TYPE_CODE_FLT) |
| { |
| warning (_("Cannot convert non-floating-point type " |
| "to floating-point register value.")); |
| return; |
| } |
| |
| /* Convert from TYPE. */ |
| target_float_convert (from, type, to, fpreg_type); |
| auto to_view = gdb::make_array_view (to, fpreg_type->length ()); |
| put_frame_register (get_next_frame_sentinel_okay (frame), regnum, to_view); |
| } |
| |
| |
| /* There is a fair number of calling conventions that are in somewhat |
| wide use. The 68000/08/10 don't support an FPU, not even as a |
| coprocessor. All function return values are stored in %d0/%d1. |
| Structures are returned in a static buffer, a pointer to which is |
| returned in %d0. This means that functions returning a structure |
| are not re-entrant. To avoid this problem some systems use a |
| convention where the caller passes a pointer to a buffer in %a1 |
| where the return values is to be stored. This convention is the |
| default, and is implemented in the function m68k_return_value. |
| |
| The 68020/030/040/060 do support an FPU, either as a coprocessor |
| (68881/2) or built-in (68040/68060). That's why System V release 4 |
| (SVR4) introduces a new calling convention specified by the SVR4 |
| psABI. Integer values are returned in %d0/%d1, pointer return |
| values in %a0 and floating values in %fp0. When calling functions |
| returning a structure the caller should pass a pointer to a buffer |
| for the return value in %a0. This convention is implemented in the |
| function m68k_svr4_return_value, and by appropriately setting the |
| struct_value_regnum member of `struct gdbarch_tdep'. |
| |
| GNU/Linux returns values in the same way as SVR4 does, but uses %a1 |
| for passing the structure return value buffer. |
| |
| GCC can also generate code where small structures are returned in |
| %d0/%d1 instead of in memory by using -freg-struct-return. This is |
| the default on NetBSD a.out, OpenBSD and GNU/Linux and several |
| embedded systems. This convention is implemented by setting the |
| struct_return member of `struct gdbarch_tdep' to reg_struct_return. |
| |
| GCC also has an "embedded" ABI. This works like the SVR4 ABI, |
| except that pointers are returned in %D0. This is implemented by |
| setting the pointer_result_regnum member of `struct gdbarch_tdep' |
| as appropriate. */ |
| |
| /* Read a function return value of TYPE from REGCACHE, and copy that |
| into VALBUF. */ |
| |
| static void |
| m68k_extract_return_value (struct type *type, struct regcache *regcache, |
| gdb_byte *valbuf) |
| { |
| int len = type->length (); |
| gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
| |
| if (type->code () == TYPE_CODE_PTR && len == 4) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| regcache->raw_read (tdep->pointer_result_regnum, valbuf); |
| } |
| else if (len <= 4) |
| { |
| regcache->raw_read (M68K_D0_REGNUM, buf); |
| memcpy (valbuf, buf + (4 - len), len); |
| } |
| else if (len <= 8) |
| { |
| regcache->raw_read (M68K_D0_REGNUM, buf); |
| memcpy (valbuf, buf + (8 - len), len - 4); |
| regcache->raw_read (M68K_D1_REGNUM, valbuf + (len - 4)); |
| } |
| else |
| internal_error (_("Cannot extract return value of %d bytes long."), len); |
| } |
| |
| static void |
| m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
| gdb_byte *valbuf) |
| { |
| gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
| struct gdbarch *gdbarch = regcache->arch (); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (tdep->float_return && type->code () == TYPE_CODE_FLT) |
| { |
| struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
| regcache->raw_read (M68K_FP0_REGNUM, buf); |
| target_float_convert (buf, fpreg_type, valbuf, type); |
| } |
| else |
| m68k_extract_return_value (type, regcache, valbuf); |
| } |
| |
| /* Write a function return value of TYPE from VALBUF into REGCACHE. */ |
| |
| static void |
| m68k_store_return_value (struct type *type, struct regcache *regcache, |
| const gdb_byte *valbuf) |
| { |
| int len = type->length (); |
| |
| if (type->code () == TYPE_CODE_PTR && len == 4) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| regcache->raw_write (tdep->pointer_result_regnum, valbuf); |
| /* gdb historically also set D0 in the SVR4 case. */ |
| if (tdep->pointer_result_regnum != M68K_D0_REGNUM) |
| regcache->raw_write (M68K_D0_REGNUM, valbuf); |
| } |
| else if (len <= 4) |
| regcache->raw_write_part (M68K_D0_REGNUM, 4 - len, len, valbuf); |
| else if (len <= 8) |
| { |
| regcache->raw_write_part (M68K_D0_REGNUM, 8 - len, len - 4, valbuf); |
| regcache->raw_write (M68K_D1_REGNUM, valbuf + (len - 4)); |
| } |
| else |
| internal_error (_("Cannot store return value of %d bytes long."), len); |
| } |
| |
| static void |
| m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, |
| const gdb_byte *valbuf) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (tdep->float_return && type->code () == TYPE_CODE_FLT) |
| { |
| struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
| gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
| target_float_convert (valbuf, type, buf, fpreg_type); |
| regcache->raw_write (M68K_FP0_REGNUM, buf); |
| } |
| else |
| m68k_store_return_value (type, regcache, valbuf); |
| } |
| |
| /* Return non-zero if TYPE, which is assumed to be a structure, union or |
| complex type, should be returned in registers for architecture |
| GDBARCH. */ |
| |
| static int |
| m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| enum type_code code = type->code (); |
| int len = type->length (); |
| |
| gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
| || code == TYPE_CODE_COMPLEX || code == TYPE_CODE_ARRAY); |
| |
| if (tdep->struct_return == pcc_struct_return) |
| return 0; |
| |
| const bool is_vector = code == TYPE_CODE_ARRAY && type->is_vector (); |
| |
| if (is_vector |
| && check_typedef (type->target_type ())->code () == TYPE_CODE_FLT) |
| return 0; |
| |
| /* According to m68k_return_in_memory in the m68k GCC back-end, |
| strange things happen for small aggregate types. Aggregate types |
| with only one component are always returned like the type of the |
| component. Aggregate types whose size is 2, 4, or 8 are returned |
| in registers if their natural alignment is at least 16 bits. |
| |
| We reject vectors here, as experimentally this gives the correct |
| answer. */ |
| if (!is_vector && (len == 2 || len == 4 || len == 8)) |
| return type_align (type) >= 2; |
| |
| return (len == 1 || len == 2 || len == 4 || len == 8); |
| } |
| |
| /* Determine, for architecture GDBARCH, how a return value of TYPE |
| should be returned. If it is supposed to be returned in registers, |
| and READBUF is non-zero, read the appropriate value from REGCACHE, |
| and copy it into READBUF. If WRITEBUF is non-zero, write the value |
| from WRITEBUF into REGCACHE. */ |
| |
| static enum return_value_convention |
| m68k_return_value (struct gdbarch *gdbarch, struct value *function, |
| struct type *type, struct regcache *regcache, |
| gdb_byte *readbuf, const gdb_byte *writebuf) |
| { |
| enum type_code code = type->code (); |
| |
| /* GCC returns a `long double' in memory too. */ |
| if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
| || code == TYPE_CODE_COMPLEX || code == TYPE_CODE_ARRAY) |
| && !m68k_reg_struct_return_p (gdbarch, type)) |
| || (code == TYPE_CODE_FLT && type->length () == 12)) |
| { |
| /* The default on m68k is to return structures in static memory. |
| Consequently a function must return the address where we can |
| find the return value. */ |
| |
| if (readbuf) |
| { |
| ULONGEST addr; |
| |
| regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); |
| read_memory (addr, readbuf, type->length ()); |
| } |
| |
| return RETURN_VALUE_ABI_RETURNS_ADDRESS; |
| } |
| |
| if (readbuf) |
| m68k_extract_return_value (type, regcache, readbuf); |
| if (writebuf) |
| m68k_store_return_value (type, regcache, writebuf); |
| |
| return RETURN_VALUE_REGISTER_CONVENTION; |
| } |
| |
| static enum return_value_convention |
| m68k_svr4_return_value (struct gdbarch *gdbarch, struct value *function, |
| struct type *type, struct regcache *regcache, |
| gdb_byte *readbuf, const gdb_byte *writebuf) |
| { |
| enum type_code code = type->code (); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| /* Aggregates with a single member are always returned like their |
| sole element. */ |
| if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) |
| && type->num_fields () == 1) |
| { |
| type = check_typedef (type->field (0).type ()); |
| return m68k_svr4_return_value (gdbarch, function, type, regcache, |
| readbuf, writebuf); |
| } |
| |
| if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
| || code == TYPE_CODE_COMPLEX || code == TYPE_CODE_ARRAY) |
| && !m68k_reg_struct_return_p (gdbarch, type)) |
| /* GCC may return a `long double' in memory too. */ |
| || (!tdep->float_return |
| && code == TYPE_CODE_FLT |
| && type->length () == 12)) |
| { |
| /* The System V ABI says that: |
| |
| "A function returning a structure or union also sets %a0 to |
| the value it finds in %a0. Thus when the caller receives |
| control again, the address of the returned object resides in |
| register %a0." |
| |
| So the ABI guarantees that we can always find the return |
| value just after the function has returned. |
| |
| However, GCC also implements the "embedded" ABI. That ABI |
| does not preserve %a0 across calls, but does write the value |
| back to %d0. */ |
| |
| if (readbuf) |
| { |
| ULONGEST addr; |
| |
| regcache_raw_read_unsigned (regcache, tdep->pointer_result_regnum, |
| &addr); |
| read_memory (addr, readbuf, type->length ()); |
| } |
| |
| return RETURN_VALUE_ABI_RETURNS_ADDRESS; |
| } |
| |
| if (readbuf) |
| m68k_svr4_extract_return_value (type, regcache, readbuf); |
| if (writebuf) |
| m68k_svr4_store_return_value (type, regcache, writebuf); |
| |
| return RETURN_VALUE_REGISTER_CONVENTION; |
| } |
| |
| |
| /* Always align the frame to a 4-byte boundary. This is required on |
| coldfire and harmless on the rest. */ |
| |
| static CORE_ADDR |
| m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
| { |
| /* Align the stack to four bytes. */ |
| return sp & ~3; |
| } |
| |
| static CORE_ADDR |
| m68k_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) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| gdb_byte buf[4]; |
| int i; |
| |
| /* Push arguments in reverse order. */ |
| for (i = nargs - 1; i >= 0; i--) |
| { |
| struct type *value_type = args[i]->enclosing_type (); |
| int len = value_type->length (); |
| int container_len = (len + 3) & ~3; |
| int offset; |
| |
| /* Non-scalars bigger than 4 bytes are left aligned, others are |
| right aligned. */ |
| if ((value_type->code () == TYPE_CODE_STRUCT |
| || value_type->code () == TYPE_CODE_UNION |
| || value_type->code () == TYPE_CODE_ARRAY) |
| && len > 4) |
| offset = 0; |
| else |
| offset = container_len - len; |
| sp -= container_len; |
| write_memory (sp + offset, args[i]->contents_all ().data (), len); |
| } |
| |
| /* Store struct value address. */ |
| if (return_method == return_method_struct) |
| { |
| store_unsigned_integer (buf, 4, byte_order, struct_addr); |
| regcache->cooked_write (tdep->struct_value_regnum, buf); |
| } |
| |
| /* Store return address. */ |
| sp -= 4; |
| store_unsigned_integer (buf, 4, byte_order, bp_addr); |
| write_memory (sp, buf, 4); |
| |
| /* Finally, update the stack pointer... */ |
| store_unsigned_integer (buf, 4, byte_order, sp); |
| regcache->cooked_write (M68K_SP_REGNUM, buf); |
| |
| /* ...and fake a frame pointer. */ |
| regcache->cooked_write (M68K_FP_REGNUM, buf); |
| |
| /* DWARF2/GCC uses the stack address *before* the function call as a |
| frame's CFA. */ |
| return sp + 8; |
| } |
| |
| /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ |
| |
| static int |
| m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (num < 8) |
| /* d0..7 */ |
| return (num - 0) + M68K_D0_REGNUM; |
| else if (num < 16) |
| /* a0..7 */ |
| return (num - 8) + M68K_A0_REGNUM; |
| else if (num < 24 && tdep->fpregs_present) |
| /* fp0..7 */ |
| return (num - 16) + M68K_FP0_REGNUM; |
| else if (num == 25) |
| /* pc */ |
| return M68K_PC_REGNUM; |
| else |
| return -1; |
| } |
| |
| |
| struct m68k_frame_cache |
| { |
| /* Base address. */ |
| CORE_ADDR base; |
| CORE_ADDR sp_offset; |
| CORE_ADDR pc; |
| |
| /* Saved registers. */ |
| CORE_ADDR saved_regs[M68K_NUM_REGS]; |
| CORE_ADDR saved_sp; |
| |
| /* Stack space reserved for local variables. */ |
| long locals; |
| }; |
| |
| /* Allocate and initialize a frame cache. */ |
| |
| static struct m68k_frame_cache * |
| m68k_alloc_frame_cache (void) |
| { |
| struct m68k_frame_cache *cache; |
| int i; |
| |
| cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
| |
| /* Base address. */ |
| cache->base = 0; |
| cache->sp_offset = -4; |
| cache->pc = 0; |
| |
| /* Saved registers. We initialize these to -1 since zero is a valid |
| offset (that's where %fp is supposed to be stored). */ |
| for (i = 0; i < M68K_NUM_REGS; i++) |
| cache->saved_regs[i] = -1; |
| |
| /* Frameless until proven otherwise. */ |
| cache->locals = -1; |
| |
| return cache; |
| } |
| |
| /* Check whether PC points at a code that sets up a new stack frame. |
| If so, it updates CACHE and returns the address of the first |
| instruction after the sequence that sets removes the "hidden" |
| argument from the stack or CURRENT_PC, whichever is smaller. |
| Otherwise, return PC. */ |
| |
| static CORE_ADDR |
| m68k_analyze_frame_setup (struct gdbarch *gdbarch, |
| CORE_ADDR pc, CORE_ADDR current_pc, |
| struct m68k_frame_cache *cache) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| int op; |
| |
| if (pc >= current_pc) |
| return current_pc; |
| |
| op = read_memory_unsigned_integer (pc, 2, byte_order); |
| |
| if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) |
| { |
| cache->saved_regs[M68K_FP_REGNUM] = 0; |
| cache->sp_offset += 4; |
| if (op == P_LINKW_FP) |
| { |
| /* link.w %fp, #-N */ |
| /* link.w %fp, #0; adda.l #-N, %sp */ |
| cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
| |
| if (pc + 4 < current_pc && cache->locals == 0) |
| { |
| op = read_memory_unsigned_integer (pc + 4, 2, byte_order); |
| if (op == P_ADDAL_SP) |
| { |
| cache->locals = read_memory_integer (pc + 6, 4, byte_order); |
| return pc + 10; |
| } |
| } |
| |
| return pc + 4; |
| } |
| else if (op == P_LINKL_FP) |
| { |
| /* link.l %fp, #-N */ |
| cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
| return pc + 6; |
| } |
| else |
| { |
| /* pea (%fp); movea.l %sp, %fp */ |
| cache->locals = 0; |
| |
| if (pc + 2 < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
| |
| if (op == P_MOVEAL_SP_FP) |
| { |
| /* move.l %sp, %fp */ |
| return pc + 4; |
| } |
| } |
| |
| return pc + 2; |
| } |
| } |
| else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| { |
| /* subq.[wl] #N,%sp */ |
| /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ |
| cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| if (pc + 2 < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
| if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| { |
| cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| return pc + 4; |
| } |
| } |
| return pc + 2; |
| } |
| else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) |
| { |
| /* adda.w #-N,%sp */ |
| /* lea (-N,%sp),%sp */ |
| cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
| return pc + 4; |
| } |
| else if (op == P_ADDAL_SP) |
| { |
| /* adda.l #-N,%sp */ |
| cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
| return pc + 6; |
| } |
| |
| return pc; |
| } |
| |
| /* Check whether PC points at code that saves registers on the stack. |
| If so, it updates CACHE and returns the address of the first |
| instruction after the register saves or CURRENT_PC, whichever is |
| smaller. Otherwise, return PC. */ |
| |
| static CORE_ADDR |
| m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
| CORE_ADDR current_pc, |
| struct m68k_frame_cache *cache) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (cache->locals >= 0) |
| { |
| CORE_ADDR offset; |
| int op; |
| int i, mask, regno; |
| |
| offset = -4 - cache->locals; |
| while (pc < current_pc) |
| { |
| op = read_memory_unsigned_integer (pc, 2, byte_order); |
| if (op == P_FMOVEMX_SP |
| && tdep->fpregs_present) |
| { |
| /* fmovem.x REGS,-(%sp) */ |
| op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
| if ((op & 0xff00) == 0xe000) |
| { |
| mask = op & 0xff; |
| for (i = 0; i < 16; i++, mask >>= 1) |
| { |
| if (mask & 1) |
| { |
| cache->saved_regs[i + M68K_FP0_REGNUM] = offset; |
| offset -= 12; |
| } |
| } |
| pc += 4; |
| } |
| else |
| break; |
| } |
| else if ((op & 0177760) == P_MOVEL_SP) |
| { |
| /* move.l %R,-(%sp) */ |
| regno = op & 017; |
| cache->saved_regs[regno] = offset; |
| offset -= 4; |
| pc += 2; |
| } |
| else if (op == P_MOVEML_SP) |
| { |
| /* movem.l REGS,-(%sp) */ |
| mask = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
| for (i = 0; i < 16; i++, mask >>= 1) |
| { |
| if (mask & 1) |
| { |
| cache->saved_regs[15 - i] = offset; |
| offset -= 4; |
| } |
| } |
| pc += 4; |
| } |
| else |
| break; |
| } |
| } |
| |
| return pc; |
| } |
| |
| |
| /* Do a full analysis of the prologue at PC and update CACHE |
| accordingly. Bail out early if CURRENT_PC is reached. Return the |
| address where the analysis stopped. |
| |
| We handle all cases that can be generated by gcc. |
| |
| For allocating a stack frame: |
| |
| link.w %a6,#-N |
| link.l %a6,#-N |
| pea (%fp); move.l %sp,%fp |
| link.w %a6,#0; add.l #-N,%sp |
| subq.l #N,%sp |
| subq.w #N,%sp |
| subq.w #8,%sp; subq.w #N-8,%sp |
| add.w #-N,%sp |
| lea (-N,%sp),%sp |
| add.l #-N,%sp |
| |
| For saving registers: |
| |
| fmovem.x REGS,-(%sp) |
| move.l R1,-(%sp) |
| move.l R1,-(%sp); move.l R2,-(%sp) |
| movem.l REGS,-(%sp) |
| |
| For setting up the PIC register: |
| |
| lea (%pc,N),%a5 |
| |
| */ |
| |
| static CORE_ADDR |
| m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
| CORE_ADDR current_pc, struct m68k_frame_cache *cache) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| unsigned int op; |
| |
| pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache); |
| pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
| if (pc >= current_pc) |
| return current_pc; |
| |
| /* Check for GOT setup. */ |
| op = read_memory_unsigned_integer (pc, 4, byte_order); |
| if (op == P_LEA_PC_A5) |
| { |
| /* lea (%pc,N),%a5 */ |
| return pc + 8; |
| } |
| |
| return pc; |
| } |
| |
| /* Return PC of first real instruction. */ |
| |
| static CORE_ADDR |
| m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
| { |
| struct m68k_frame_cache cache; |
| CORE_ADDR pc; |
| |
| cache.locals = -1; |
| pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
| if (cache.locals < 0) |
| return start_pc; |
| return pc; |
| } |
| |
| static CORE_ADDR |
| m68k_unwind_pc (struct gdbarch *gdbarch, const frame_info_ptr &next_frame) |
| { |
| gdb_byte buf[8]; |
| |
| frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
| return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
| } |
| |
| /* Normal frames. */ |
| |
| static struct m68k_frame_cache * |
| m68k_frame_cache (const frame_info_ptr &this_frame, void **this_cache) |
| { |
| struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| struct m68k_frame_cache *cache; |
| gdb_byte buf[4]; |
| int i; |
| |
| if (*this_cache) |
| return (struct m68k_frame_cache *) *this_cache; |
| |
| cache = m68k_alloc_frame_cache (); |
| *this_cache = cache; |
| |
| /* In principle, for normal frames, %fp holds the frame pointer, |
| which holds the base address for the current stack frame. |
| However, for functions that don't need it, the frame pointer is |
| optional. For these "frameless" functions the frame pointer is |
| actually the frame pointer of the calling frame. Signal |
| trampolines are just a special case of a "frameless" function. |
| They (usually) share their frame pointer with the frame that was |
| in progress when the signal occurred. */ |
| |
| get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
| cache->base = extract_unsigned_integer (buf, 4, byte_order); |
| if (cache->base == 0) |
| return cache; |
| |
| /* For normal frames, %pc is stored at 4(%fp). */ |
| cache->saved_regs[M68K_PC_REGNUM] = 4; |
| |
| cache->pc = get_frame_func (this_frame); |
| if (cache->pc != 0) |
| m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
| get_frame_pc (this_frame), cache); |
| |
| if (cache->locals < 0) |
| { |
| /* We didn't find a valid frame, which means that CACHE->base |
| currently holds the frame pointer for our calling frame. If |
| we're at the start of a function, or somewhere half-way its |
| prologue, the function's frame probably hasn't been fully |
| setup yet. Try to reconstruct the base address for the stack |
| frame by looking at the stack pointer. For truly "frameless" |
| functions this might work too. */ |
| |
| get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
| cache->base = extract_unsigned_integer (buf, 4, byte_order) |
| + cache->sp_offset; |
| } |
| |
| /* Now that we have the base address for the stack frame we can |
| calculate the value of %sp in the calling frame. */ |
| cache->saved_sp = cache->base + 8; |
| |
| /* Adjust all the saved registers such that they contain addresses |
| instead of offsets. */ |
| for (i = 0; i < M68K_NUM_REGS; i++) |
| if (cache->saved_regs[i] != -1) |
| cache->saved_regs[i] += cache->base; |
| |
| return cache; |
| } |
| |
| static void |
| m68k_frame_this_id (const frame_info_ptr &this_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
| |
| /* This marks the outermost frame. */ |
| if (cache->base == 0) |
| return; |
| |
| /* See the end of m68k_push_dummy_call. */ |
| *this_id = frame_id_build (cache->base + 8, cache->pc); |
| } |
| |
| static struct value * |
| m68k_frame_prev_register (const frame_info_ptr &this_frame, void **this_cache, |
| int regnum) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
| |
| gdb_assert (regnum >= 0); |
| |
| if (regnum == M68K_SP_REGNUM && cache->saved_sp) |
| return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
| |
| if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) |
| return frame_unwind_got_memory (this_frame, regnum, |
| cache->saved_regs[regnum]); |
| |
| return frame_unwind_got_register (this_frame, regnum, regnum); |
| } |
| |
| static const struct frame_unwind m68k_frame_unwind = |
| { |
| "m68k prologue", |
| NORMAL_FRAME, |
| default_frame_unwind_stop_reason, |
| m68k_frame_this_id, |
| m68k_frame_prev_register, |
| NULL, |
| default_frame_sniffer |
| }; |
| |
| static CORE_ADDR |
| m68k_frame_base_address (const frame_info_ptr &this_frame, void **this_cache) |
| { |
| struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
| |
| return cache->base; |
| } |
| |
| static const struct frame_base m68k_frame_base = |
| { |
| &m68k_frame_unwind, |
| m68k_frame_base_address, |
| m68k_frame_base_address, |
| m68k_frame_base_address |
| }; |
| |
| static struct frame_id |
| m68k_dummy_id (struct gdbarch *gdbarch, const frame_info_ptr &this_frame) |
| { |
| CORE_ADDR fp; |
| |
| fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
| |
| /* See the end of m68k_push_dummy_call. */ |
| return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
| } |
| |
| |
| /* Figure out where the longjmp will land. Slurp the args out of the stack. |
| We expect the first arg to be a pointer to the jmp_buf structure from which |
| we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| This routine returns true on success. */ |
| |
| static int |
| m68k_get_longjmp_target (const frame_info_ptr &frame, CORE_ADDR *pc) |
| { |
| gdb_byte *buf; |
| CORE_ADDR sp, jb_addr; |
| struct gdbarch *gdbarch = get_frame_arch (frame); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| |
| if (tdep->jb_pc < 0) |
| { |
| internal_error (_("m68k_get_longjmp_target: not implemented")); |
| return 0; |
| } |
| |
| buf = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
| sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); |
| |
| if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
| buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
| return 0; |
| |
| jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
| / TARGET_CHAR_BIT, byte_order); |
| |
| if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
| gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT), |
| byte_order) |
| return 0; |
| |
| *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
| / TARGET_CHAR_BIT, byte_order); |
| return 1; |
| } |
| |
| |
| /* This is the implementation of gdbarch method |
| return_in_first_hidden_param_p. */ |
| |
| static int |
| m68k_return_in_first_hidden_param_p (struct gdbarch *gdbarch, |
| struct type *type) |
| { |
| return 0; |
| } |
| |
| /* System V Release 4 (SVR4). */ |
| |
| void |
| m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| /* SVR4 uses a different calling convention. */ |
| set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); |
| |
| /* SVR4 uses %a0 instead of %a1. */ |
| tdep->struct_value_regnum = M68K_A0_REGNUM; |
| |
| /* SVR4 returns pointers in %a0. */ |
| tdep->pointer_result_regnum = M68K_A0_REGNUM; |
| } |
| |
| /* GCC's m68k "embedded" ABI. This is like the SVR4 ABI, but pointer |
| values are returned in %d0, not %a0. */ |
| |
| static void |
| m68k_embedded_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| m68k_svr4_init_abi (info, gdbarch); |
| tdep->pointer_result_regnum = M68K_D0_REGNUM; |
| } |
| |
| |
| |
| /* Function: m68k_gdbarch_init |
| Initializer function for the m68k gdbarch vector. |
| Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
| |
| static struct gdbarch * |
| m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| { |
| struct gdbarch_list *best_arch; |
| tdesc_arch_data_up tdesc_data; |
| int i; |
| enum m68k_flavour flavour = m68k_no_flavour; |
| int has_fp = 1; |
| const struct floatformat **long_double_format = floatformats_m68881_ext; |
| |
| /* Check any target description for validity. */ |
| if (tdesc_has_registers (info.target_desc)) |
| { |
| const struct tdesc_feature *feature; |
| int valid_p; |
| |
| feature = tdesc_find_feature (info.target_desc, |
| "org.gnu.gdb.m68k.core"); |
| |
| if (feature == NULL) |
| { |
| feature = tdesc_find_feature (info.target_desc, |
| "org.gnu.gdb.coldfire.core"); |
| if (feature != NULL) |
| flavour = m68k_coldfire_flavour; |
| } |
| |
| if (feature == NULL) |
| { |
| feature = tdesc_find_feature (info.target_desc, |
| "org.gnu.gdb.fido.core"); |
| if (feature != NULL) |
| flavour = m68k_fido_flavour; |
| } |
| |
| if (feature == NULL) |
| return NULL; |
| |
| tdesc_data = tdesc_data_alloc (); |
| |
| valid_p = 1; |
| for (i = 0; i <= M68K_PC_REGNUM; i++) |
| valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
| m68k_register_names[i]); |
| |
| if (!valid_p) |
| return NULL; |
| |
| feature = tdesc_find_feature (info.target_desc, |
| "org.gnu.gdb.coldfire.fp"); |
| if (feature != NULL) |
| { |
| valid_p = 1; |
| for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) |
| valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
| m68k_register_names[i]); |
| if (!valid_p) |
| return NULL; |
| } |
| else |
| has_fp = 0; |
| } |
| |
| /* The mechanism for returning floating values from function |
| and the type of long double depend on whether we're |
| on ColdFire or standard m68k. */ |
| |
| if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
| { |
| const bfd_arch_info_type *coldfire_arch = |
| bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); |
| |
| if (coldfire_arch |
| && ((*info.bfd_arch_info->compatible) |
| (info.bfd_arch_info, coldfire_arch))) |
| flavour = m68k_coldfire_flavour; |
| } |
| |
| /* Try to figure out if the arch uses floating registers to return |
| floating point values from functions. On ColdFire, floating |
| point values are returned in D0. */ |
| int float_return = 0; |
| if (has_fp && flavour != m68k_coldfire_flavour) |
| float_return = 1; |
| #ifdef HAVE_ELF |
| if (info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour) |
| { |
| int fp_abi = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU, |
| Tag_GNU_M68K_ABI_FP); |
| if (fp_abi == 1) |
| float_return = 1; |
| else if (fp_abi == 2) |
| float_return = 0; |
| } |
| #endif /* HAVE_ELF */ |
| |
| /* If there is already a candidate, use it. */ |
| for (best_arch = gdbarch_list_lookup_by_info (arches, &info); |
| best_arch != NULL; |
| best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) |
| { |
| m68k_gdbarch_tdep *tdep |
| = gdbarch_tdep<m68k_gdbarch_tdep> (best_arch->gdbarch); |
| |
| if (flavour != tdep->flavour) |
| continue; |
| |
| if (has_fp != tdep->fpregs_present) |
| continue; |
| |
| if (float_return != tdep->float_return) |
| continue; |
| |
| break; |
| } |
| |
| if (best_arch != NULL) |
| return best_arch->gdbarch; |
| |
| gdbarch *gdbarch |
| = gdbarch_alloc (&info, gdbarch_tdep_up (new m68k_gdbarch_tdep)); |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| tdep->fpregs_present = has_fp; |
| tdep->float_return = float_return; |
| tdep->flavour = flavour; |
| |
| if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
| long_double_format = floatformats_ieee_double; |
| set_gdbarch_long_double_format (gdbarch, long_double_format); |
| set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); |
| |
| set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
| set_gdbarch_breakpoint_kind_from_pc (gdbarch, m68k_breakpoint::kind_from_pc); |
| set_gdbarch_sw_breakpoint_from_kind (gdbarch, m68k_breakpoint::bp_from_kind); |
| |
| /* Stack grows down. */ |
| set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
| |
| set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
| set_gdbarch_decr_pc_after_break (gdbarch, 2); |
| |
| set_gdbarch_frame_args_skip (gdbarch, 8); |
| set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
| |
| set_gdbarch_register_type (gdbarch, m68k_register_type); |
| set_gdbarch_register_name (gdbarch, m68k_register_name); |
| set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
| set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
| set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
| set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); |
| set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
| set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); |
| set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); |
| |
| if (has_fp) |
| set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); |
| |
| /* Function call & return. */ |
| set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
| set_gdbarch_return_value (gdbarch, m68k_return_value); |
| set_gdbarch_return_in_first_hidden_param_p (gdbarch, |
| m68k_return_in_first_hidden_param_p); |
| |
| #if defined JB_PC && defined JB_ELEMENT_SIZE |
| tdep->jb_pc = JB_PC; |
| tdep->jb_elt_size = JB_ELEMENT_SIZE; |
| #else |
| tdep->jb_pc = -1; |
| #endif |
| tdep->pointer_result_regnum = M68K_D0_REGNUM; |
| tdep->struct_value_regnum = M68K_A1_REGNUM; |
| tdep->struct_return = reg_struct_return; |
| |
| /* Frame unwinder. */ |
| set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
| set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
| |
| /* Hook in the DWARF CFI frame unwinder. */ |
| dwarf2_append_unwinders (gdbarch); |
| |
| frame_base_set_default (gdbarch, &m68k_frame_base); |
| |
| /* Hook in ABI-specific overrides, if they have been registered. */ |
| gdbarch_init_osabi (info, gdbarch); |
| |
| /* Now we have tuned the configuration, set a few final things, |
| based on what the OS ABI has told us. */ |
| |
| if (tdep->jb_pc >= 0) |
| set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); |
| |
| frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
| |
| if (tdesc_data != nullptr) |
| tdesc_use_registers (gdbarch, info.target_desc, std::move (tdesc_data)); |
| |
| return gdbarch; |
| } |
| |
| |
| static void |
| m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
| { |
| m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch); |
| |
| if (tdep == NULL) |
| return; |
| } |
| |
| /* OSABI sniffer for m68k. */ |
| |
| static enum gdb_osabi |
| m68k_osabi_sniffer (bfd *abfd) |
| { |
| unsigned int elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
| enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
| |
| if (elfosabi == ELFOSABI_NONE) |
| { |
| /* Check note sections. */ |
| for (asection *sect : gdb_bfd_sections (abfd)) |
| generic_elf_osabi_sniff_abi_tag_sections (abfd, sect, &osabi); |
| |
| if (osabi == GDB_OSABI_UNKNOWN) |
| osabi = GDB_OSABI_SVR4; |
| } |
| |
| return osabi; |
| } |
| |
| void _initialize_m68k_tdep (); |
| void |
| _initialize_m68k_tdep () |
| { |
| gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
| |
| gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_elf_flavour, |
| m68k_osabi_sniffer); |
| gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_SVR4, |
| m68k_embedded_init_abi); |
| } |