| /* Target-dependent code for the x86-64 for GDB, the GNU debugger. |
| |
| Copyright 2001, 2002, 2003 Free Software Foundation, Inc. |
| Contributed by Jiri Smid, SuSE Labs. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "gdbcore.h" |
| #include "gdbcmd.h" |
| #include "arch-utils.h" |
| #include "regcache.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "x86-64-tdep.h" |
| #include "dwarf2cfi.h" |
| #include "gdb_assert.h" |
| #include "block.h" |
| |
| /* Register numbers of various important registers. */ |
| #define RAX_REGNUM 0 |
| #define RDX_REGNUM 3 |
| #define RDI_REGNUM 5 |
| #define EFLAGS_REGNUM 17 |
| #define ST0_REGNUM 22 |
| #define XMM1_REGNUM 39 |
| |
| struct register_info |
| { |
| int size; |
| char *name; |
| struct type **type; |
| }; |
| |
| /* x86_64_register_raw_size_table[i] is the number of bytes of storage in |
| GDB's register array occupied by register i. */ |
| static struct register_info x86_64_register_info_table[] = { |
| /* 0 */ {8, "rax", &builtin_type_int64}, |
| /* 1 */ {8, "rbx", &builtin_type_int64}, |
| /* 2 */ {8, "rcx", &builtin_type_int64}, |
| /* 3 */ {8, "rdx", &builtin_type_int64}, |
| /* 4 */ {8, "rsi", &builtin_type_int64}, |
| /* 5 */ {8, "rdi", &builtin_type_int64}, |
| /* 6 */ {8, "rbp", &builtin_type_void_func_ptr}, |
| /* 7 */ {8, "rsp", &builtin_type_void_func_ptr}, |
| /* 8 */ {8, "r8", &builtin_type_int64}, |
| /* 9 */ {8, "r9", &builtin_type_int64}, |
| /* 10 */ {8, "r10", &builtin_type_int64}, |
| /* 11 */ {8, "r11", &builtin_type_int64}, |
| /* 12 */ {8, "r12", &builtin_type_int64}, |
| /* 13 */ {8, "r13", &builtin_type_int64}, |
| /* 14 */ {8, "r14", &builtin_type_int64}, |
| /* 15 */ {8, "r15", &builtin_type_int64}, |
| /* 16 */ {8, "rip", &builtin_type_void_func_ptr}, |
| /* 17 */ {4, "eflags", &builtin_type_int32}, |
| /* 18 */ {4, "ds", &builtin_type_int32}, |
| /* 19 */ {4, "es", &builtin_type_int32}, |
| /* 20 */ {4, "fs", &builtin_type_int32}, |
| /* 21 */ {4, "gs", &builtin_type_int32}, |
| /* 22 */ {10, "st0", &builtin_type_i387_ext}, |
| /* 23 */ {10, "st1", &builtin_type_i387_ext}, |
| /* 24 */ {10, "st2", &builtin_type_i387_ext}, |
| /* 25 */ {10, "st3", &builtin_type_i387_ext}, |
| /* 26 */ {10, "st4", &builtin_type_i387_ext}, |
| /* 27 */ {10, "st5", &builtin_type_i387_ext}, |
| /* 28 */ {10, "st6", &builtin_type_i387_ext}, |
| /* 29 */ {10, "st7", &builtin_type_i387_ext}, |
| /* 30 */ {4, "fctrl", &builtin_type_int32}, |
| /* 31 */ {4, "fstat", &builtin_type_int32}, |
| /* 32 */ {4, "ftag", &builtin_type_int32}, |
| /* 33 */ {4, "fiseg", &builtin_type_int32}, |
| /* 34 */ {4, "fioff", &builtin_type_int32}, |
| /* 35 */ {4, "foseg", &builtin_type_int32}, |
| /* 36 */ {4, "fooff", &builtin_type_int32}, |
| /* 37 */ {4, "fop", &builtin_type_int32}, |
| /* 38 */ {16, "xmm0", &builtin_type_v4sf}, |
| /* 39 */ {16, "xmm1", &builtin_type_v4sf}, |
| /* 40 */ {16, "xmm2", &builtin_type_v4sf}, |
| /* 41 */ {16, "xmm3", &builtin_type_v4sf}, |
| /* 42 */ {16, "xmm4", &builtin_type_v4sf}, |
| /* 43 */ {16, "xmm5", &builtin_type_v4sf}, |
| /* 44 */ {16, "xmm6", &builtin_type_v4sf}, |
| /* 45 */ {16, "xmm7", &builtin_type_v4sf}, |
| /* 46 */ {16, "xmm8", &builtin_type_v4sf}, |
| /* 47 */ {16, "xmm9", &builtin_type_v4sf}, |
| /* 48 */ {16, "xmm10", &builtin_type_v4sf}, |
| /* 49 */ {16, "xmm11", &builtin_type_v4sf}, |
| /* 50 */ {16, "xmm12", &builtin_type_v4sf}, |
| /* 51 */ {16, "xmm13", &builtin_type_v4sf}, |
| /* 52 */ {16, "xmm14", &builtin_type_v4sf}, |
| /* 53 */ {16, "xmm15", &builtin_type_v4sf}, |
| /* 54 */ {4, "mxcsr", &builtin_type_int32} |
| }; |
| |
| /* This array is a mapping from Dwarf-2 register |
| numbering to GDB's one. Dwarf-2 numbering is |
| defined in x86-64 ABI, section 3.6. */ |
| static int x86_64_dwarf2gdb_regno_map[] = { |
| 0, 1, 2, 3, /* RAX - RDX */ |
| 4, 5, 6, 7, /* RSI, RDI, RBP, RSP */ |
| 8, 9, 10, 11, /* R8 - R11 */ |
| 12, 13, 14, 15, /* R12 - R15 */ |
| -1, /* RA - not mapped */ |
| XMM1_REGNUM - 1, XMM1_REGNUM, /* XMM0 ... */ |
| XMM1_REGNUM + 1, XMM1_REGNUM + 2, |
| XMM1_REGNUM + 3, XMM1_REGNUM + 4, |
| XMM1_REGNUM + 5, XMM1_REGNUM + 6, |
| XMM1_REGNUM + 7, XMM1_REGNUM + 8, |
| XMM1_REGNUM + 9, XMM1_REGNUM + 10, |
| XMM1_REGNUM + 11, XMM1_REGNUM + 12, |
| XMM1_REGNUM + 13, XMM1_REGNUM + 14, /* ... XMM15 */ |
| ST0_REGNUM + 0, ST0_REGNUM + 1, /* ST0 ... */ |
| ST0_REGNUM + 2, ST0_REGNUM + 3, |
| ST0_REGNUM + 4, ST0_REGNUM + 5, |
| ST0_REGNUM + 6, ST0_REGNUM + 7 /* ... ST7 */ |
| }; |
| |
| static int x86_64_dwarf2gdb_regno_map_length = |
| sizeof (x86_64_dwarf2gdb_regno_map) / |
| sizeof (x86_64_dwarf2gdb_regno_map[0]); |
| |
| /* Number of all registers */ |
| #define X86_64_NUM_REGS (sizeof (x86_64_register_info_table) / \ |
| sizeof (x86_64_register_info_table[0])) |
| |
| /* Number of general registers. */ |
| #define X86_64_NUM_GREGS (22) |
| |
| int x86_64_num_regs = X86_64_NUM_REGS; |
| int x86_64_num_gregs = X86_64_NUM_GREGS; |
| |
| /* Did we already print a note about frame pointer? */ |
| int omit_fp_note_printed = 0; |
| |
| /* Number of bytes of storage in the actual machine representation for |
| register REGNO. */ |
| int |
| x86_64_register_raw_size (int regno) |
| { |
| return x86_64_register_info_table[regno].size; |
| } |
| |
| /* x86_64_register_byte_table[i] is the offset into the register file of the |
| start of register number i. We initialize this from |
| x86_64_register_info_table. */ |
| int x86_64_register_byte_table[X86_64_NUM_REGS]; |
| |
| /* Index within `registers' of the first byte of the space for register REGNO. */ |
| int |
| x86_64_register_byte (int regno) |
| { |
| return x86_64_register_byte_table[regno]; |
| } |
| |
| /* Return the GDB type object for the "standard" data type of data in |
| register N. */ |
| static struct type * |
| x86_64_register_virtual_type (int regno) |
| { |
| return *x86_64_register_info_table[regno].type; |
| } |
| |
| /* x86_64_register_convertible is true if register N's virtual format is |
| different from its raw format. Note that this definition assumes |
| that the host supports IEEE 32-bit floats, since it doesn't say |
| that SSE registers need conversion. Even if we can't find a |
| counterexample, this is still sloppy. */ |
| int |
| x86_64_register_convertible (int regno) |
| { |
| return IS_FP_REGNUM (regno); |
| } |
| |
| /* Convert data from raw format for register REGNUM in buffer FROM to |
| virtual format with type TYPE in buffer TO. In principle both |
| formats are identical except that the virtual format has two extra |
| bytes appended that aren't used. We set these to zero. */ |
| void |
| x86_64_register_convert_to_virtual (int regnum, struct type *type, |
| char *from, char *to) |
| { |
| char buf[12]; |
| |
| /* We only support floating-point values. */ |
| if (TYPE_CODE (type) != TYPE_CODE_FLT) |
| { |
| warning ("Cannot convert floating-point register value " |
| "to non-floating-point type."); |
| memset (to, 0, TYPE_LENGTH (type)); |
| return; |
| } |
| /* First add the necessary padding. */ |
| memcpy (buf, from, FPU_REG_RAW_SIZE); |
| memset (buf + FPU_REG_RAW_SIZE, 0, sizeof buf - FPU_REG_RAW_SIZE); |
| /* Convert to TYPE. This should be a no-op, if TYPE is equivalent |
| to the extended floating-point format used by the FPU. */ |
| convert_typed_floating (to, type, buf, |
| x86_64_register_virtual_type (regnum)); |
| } |
| |
| /* Convert data from virtual format with type TYPE in buffer FROM to |
| raw format for register REGNUM in buffer TO. Simply omit the two |
| unused bytes. */ |
| |
| void |
| x86_64_register_convert_to_raw (struct type *type, int regnum, |
| char *from, char *to) |
| { |
| gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12); |
| /* Simply omit the two unused bytes. */ |
| memcpy (to, from, FPU_REG_RAW_SIZE); |
| } |
| |
| /* Dwarf-2 <-> GDB register numbers mapping. */ |
| int |
| x86_64_dwarf2_reg_to_regnum (int dw_reg) |
| { |
| if (dw_reg < 0 || dw_reg > x86_64_dwarf2gdb_regno_map_length) |
| { |
| warning ("Dwarf-2 uses unmapped register #%d\n", dw_reg); |
| return dw_reg; |
| } |
| |
| return x86_64_dwarf2gdb_regno_map[dw_reg]; |
| } |
| |
| /* This is the variable that is set with "set disassembly-flavour", and |
| its legitimate values. */ |
| static const char att_flavour[] = "att"; |
| static const char intel_flavour[] = "intel"; |
| static const char *valid_flavours[] = { |
| att_flavour, |
| intel_flavour, |
| NULL |
| }; |
| static const char *disassembly_flavour = att_flavour; |
| |
| /* Push the return address (pointing to the call dummy) onto the stack |
| and return the new value for the stack pointer. */ |
| |
| static CORE_ADDR |
| x86_64_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| { |
| char buf[8]; |
| |
| store_unsigned_integer (buf, 8, CALL_DUMMY_ADDRESS ()); |
| write_memory (sp - 8, buf, 8); |
| return sp - 8; |
| } |
| |
| static void |
| x86_64_pop_frame (void) |
| { |
| generic_pop_current_frame (cfi_pop_frame); |
| } |
| |
| |
| /* The returning of values is done according to the special algorithm. |
| Some types are returned in registers an some (big structures) in memory. |
| See ABI for details. |
| */ |
| |
| #define MAX_CLASSES 4 |
| |
| enum x86_64_reg_class |
| { |
| X86_64_NO_CLASS, |
| X86_64_INTEGER_CLASS, |
| X86_64_INTEGERSI_CLASS, |
| X86_64_SSE_CLASS, |
| X86_64_SSESF_CLASS, |
| X86_64_SSEDF_CLASS, |
| X86_64_SSEUP_CLASS, |
| X86_64_X87_CLASS, |
| X86_64_X87UP_CLASS, |
| X86_64_MEMORY_CLASS |
| }; |
| |
| /* Return the union class of CLASS1 and CLASS2. |
| See the x86-64 ABI for details. */ |
| |
| static enum x86_64_reg_class |
| merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2) |
| { |
| /* Rule #1: If both classes are equal, this is the resulting class. */ |
| if (class1 == class2) |
| return class1; |
| |
| /* Rule #2: If one of the classes is NO_CLASS, the resulting class |
| is the other class. */ |
| if (class1 == X86_64_NO_CLASS) |
| return class2; |
| if (class2 == X86_64_NO_CLASS) |
| return class1; |
| |
| /* Rule #3: If one of the classes is MEMORY, the result is MEMORY. */ |
| if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS) |
| return X86_64_MEMORY_CLASS; |
| |
| /* Rule #4: If one of the classes is INTEGER, the result is INTEGER. */ |
| if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS) |
| || (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS)) |
| return X86_64_INTEGERSI_CLASS; |
| if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS |
| || class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS) |
| return X86_64_INTEGER_CLASS; |
| |
| /* Rule #5: If one of the classes is X87 or X87UP class, MEMORY is used. */ |
| if (class1 == X86_64_X87_CLASS || class1 == X86_64_X87UP_CLASS |
| || class2 == X86_64_X87_CLASS || class2 == X86_64_X87UP_CLASS) |
| return X86_64_MEMORY_CLASS; |
| |
| /* Rule #6: Otherwise class SSE is used. */ |
| return X86_64_SSE_CLASS; |
| } |
| |
| /* Classify the argument type. CLASSES will be filled by the register |
| class used to pass each word of the operand. The number of words |
| is returned. In case the parameter should be passed in memory, 0 |
| is returned. As a special case for zero sized containers, |
| classes[0] will be NO_CLASS and 1 is returned. |
| |
| See the x86-64 psABI for details. */ |
| |
| static int |
| classify_argument (struct type *type, |
| enum x86_64_reg_class classes[MAX_CLASSES], int bit_offset) |
| { |
| int bytes = TYPE_LENGTH (type); |
| int words = (bytes + 8 - 1) / 8; |
| |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_ARRAY: |
| case TYPE_CODE_STRUCT: |
| case TYPE_CODE_UNION: |
| { |
| int i; |
| enum x86_64_reg_class subclasses[MAX_CLASSES]; |
| |
| /* On x86-64 we pass structures larger than 16 bytes on the stack. */ |
| if (bytes > 16) |
| return 0; |
| |
| for (i = 0; i < words; i++) |
| classes[i] = X86_64_NO_CLASS; |
| |
| /* Zero sized arrays or structures are NO_CLASS. We return 0 |
| to signalize memory class, so handle it as special case. */ |
| if (!words) |
| { |
| classes[0] = X86_64_NO_CLASS; |
| return 1; |
| } |
| switch (TYPE_CODE (type)) |
| { |
| case TYPE_CODE_STRUCT: |
| { |
| int j; |
| for (j = 0; j < TYPE_NFIELDS (type); ++j) |
| { |
| int num = classify_argument (TYPE_FIELDS (type)[j].type, |
| subclasses, |
| (TYPE_FIELDS (type)[j].loc. |
| bitpos + bit_offset) % 256); |
| if (!num) |
| return 0; |
| for (i = 0; i < num; i++) |
| { |
| int pos = |
| (TYPE_FIELDS (type)[j].loc.bitpos + |
| bit_offset) / 8 / 8; |
| classes[i + pos] = |
| merge_classes (subclasses[i], classes[i + pos]); |
| } |
| } |
| } |
| break; |
| case TYPE_CODE_ARRAY: |
| { |
| int num; |
| |
| num = classify_argument (TYPE_TARGET_TYPE (type), |
| subclasses, bit_offset); |
| if (!num) |
| return 0; |
| |
| /* The partial classes are now full classes. */ |
| if (subclasses[0] == X86_64_SSESF_CLASS && bytes != 4) |
| subclasses[0] = X86_64_SSE_CLASS; |
| if (subclasses[0] == X86_64_INTEGERSI_CLASS && bytes != 4) |
| subclasses[0] = X86_64_INTEGER_CLASS; |
| |
| for (i = 0; i < words; i++) |
| classes[i] = subclasses[i % num]; |
| } |
| break; |
| case TYPE_CODE_UNION: |
| { |
| int j; |
| { |
| for (j = 0; j < TYPE_NFIELDS (type); ++j) |
| { |
| int num; |
| num = classify_argument (TYPE_FIELDS (type)[j].type, |
| subclasses, bit_offset); |
| if (!num) |
| return 0; |
| for (i = 0; i < num; i++) |
| classes[i] = merge_classes (subclasses[i], classes[i]); |
| } |
| } |
| } |
| break; |
| default: |
| break; |
| } |
| /* Final merger cleanup. */ |
| for (i = 0; i < words; i++) |
| { |
| /* If one class is MEMORY, everything should be passed in |
| memory. */ |
| if (classes[i] == X86_64_MEMORY_CLASS) |
| return 0; |
| |
| /* The X86_64_SSEUP_CLASS should be always preceeded by |
| X86_64_SSE_CLASS. */ |
| if (classes[i] == X86_64_SSEUP_CLASS |
| && (i == 0 || classes[i - 1] != X86_64_SSE_CLASS)) |
| classes[i] = X86_64_SSE_CLASS; |
| |
| /* X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS. */ |
| if (classes[i] == X86_64_X87UP_CLASS |
| && (i == 0 || classes[i - 1] != X86_64_X87_CLASS)) |
| classes[i] = X86_64_SSE_CLASS; |
| } |
| return words; |
| } |
| break; |
| case TYPE_CODE_FLT: |
| switch (bytes) |
| { |
| case 4: |
| if (!(bit_offset % 64)) |
| classes[0] = X86_64_SSESF_CLASS; |
| else |
| classes[0] = X86_64_SSE_CLASS; |
| return 1; |
| case 8: |
| classes[0] = X86_64_SSEDF_CLASS; |
| return 1; |
| case 16: |
| classes[0] = X86_64_X87_CLASS; |
| classes[1] = X86_64_X87UP_CLASS; |
| return 2; |
| } |
| break; |
| case TYPE_CODE_INT: |
| case TYPE_CODE_PTR: |
| switch (bytes) |
| { |
| case 1: |
| case 2: |
| case 4: |
| case 8: |
| if (bytes * 8 + bit_offset <= 32) |
| classes[0] = X86_64_INTEGERSI_CLASS; |
| else |
| classes[0] = X86_64_INTEGER_CLASS; |
| return 1; |
| case 16: |
| classes[0] = classes[1] = X86_64_INTEGER_CLASS; |
| return 2; |
| default: |
| break; |
| } |
| case TYPE_CODE_VOID: |
| return 0; |
| default: /* Avoid warning. */ |
| break; |
| } |
| internal_error (__FILE__, __LINE__, |
| "classify_argument: unknown argument type"); |
| } |
| |
| /* Examine the argument and set *INT_NREGS and *SSE_NREGS to the |
| number of registers required based on the information passed in |
| CLASSES. Return 0 if parameter should be passed in memory. */ |
| |
| static int |
| examine_argument (enum x86_64_reg_class classes[MAX_CLASSES], |
| int n, int *int_nregs, int *sse_nregs) |
| { |
| *int_nregs = 0; |
| *sse_nregs = 0; |
| if (!n) |
| return 0; |
| for (n--; n >= 0; n--) |
| switch (classes[n]) |
| { |
| case X86_64_INTEGER_CLASS: |
| case X86_64_INTEGERSI_CLASS: |
| (*int_nregs)++; |
| break; |
| case X86_64_SSE_CLASS: |
| case X86_64_SSESF_CLASS: |
| case X86_64_SSEDF_CLASS: |
| (*sse_nregs)++; |
| break; |
| case X86_64_NO_CLASS: |
| case X86_64_SSEUP_CLASS: |
| case X86_64_X87_CLASS: |
| case X86_64_X87UP_CLASS: |
| break; |
| case X86_64_MEMORY_CLASS: |
| internal_error (__FILE__, __LINE__, |
| "examine_argument: unexpected memory class"); |
| } |
| return 1; |
| } |
| |
| #define RET_INT_REGS 2 |
| #define RET_SSE_REGS 2 |
| |
| /* Check if the structure in value_type is returned in registers or in |
| memory. If this function returns 1, GDB will call |
| STORE_STRUCT_RETURN and EXTRACT_STRUCT_VALUE_ADDRESS else |
| STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE will be used. */ |
| int |
| x86_64_use_struct_convention (int gcc_p, struct type *value_type) |
| { |
| enum x86_64_reg_class class[MAX_CLASSES]; |
| int n = classify_argument (value_type, class, 0); |
| int needed_intregs; |
| int needed_sseregs; |
| |
| return (!n || |
| !examine_argument (class, n, &needed_intregs, &needed_sseregs) || |
| needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS); |
| } |
| |
| /* Extract from an array REGBUF containing the (raw) register state, a |
| function return value of TYPE, and copy that, in virtual format, |
| into VALBUF. */ |
| |
| void |
| x86_64_extract_return_value (struct type *type, struct regcache *regcache, |
| void *valbuf) |
| { |
| enum x86_64_reg_class class[MAX_CLASSES]; |
| int n = classify_argument (type, class, 0); |
| int needed_intregs; |
| int needed_sseregs; |
| int intreg = 0; |
| int ssereg = 0; |
| int offset = 0; |
| int ret_int_r[RET_INT_REGS] = { RAX_REGNUM, RDX_REGNUM }; |
| int ret_sse_r[RET_SSE_REGS] = { XMM0_REGNUM, XMM1_REGNUM }; |
| |
| if (!n || |
| !examine_argument (class, n, &needed_intregs, &needed_sseregs) || |
| needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS) |
| { /* memory class */ |
| CORE_ADDR addr; |
| regcache_cooked_read (regcache, RAX_REGNUM, &addr); |
| read_memory (addr, valbuf, TYPE_LENGTH (type)); |
| return; |
| } |
| else |
| { |
| int i; |
| for (i = 0; i < n; i++) |
| { |
| switch (class[i]) |
| { |
| case X86_64_NO_CLASS: |
| break; |
| case X86_64_INTEGER_CLASS: |
| regcache_cooked_read (regcache, ret_int_r[(intreg + 1) / 2], |
| (char *) valbuf + offset); |
| offset += 8; |
| intreg += 2; |
| break; |
| case X86_64_INTEGERSI_CLASS: |
| regcache_cooked_read_part (regcache, ret_int_r[intreg / 2], |
| 0, 4, (char *) valbuf + offset); |
| offset += 8; |
| intreg++; |
| break; |
| case X86_64_SSEDF_CLASS: |
| case X86_64_SSESF_CLASS: |
| case X86_64_SSE_CLASS: |
| regcache_cooked_read_part (regcache, |
| ret_sse_r[(ssereg + 1) / 2], 0, 8, |
| (char *) valbuf + offset); |
| offset += 8; |
| ssereg += 2; |
| break; |
| case X86_64_SSEUP_CLASS: |
| regcache_cooked_read_part (regcache, ret_sse_r[ssereg / 2], |
| 0, 8, (char *) valbuf + offset); |
| offset += 8; |
| ssereg++; |
| break; |
| case X86_64_X87_CLASS: |
| regcache_cooked_read_part (regcache, FP0_REGNUM, |
| 0, 8, (char *) valbuf + offset); |
| offset += 8; |
| break; |
| case X86_64_X87UP_CLASS: |
| regcache_cooked_read_part (regcache, FP0_REGNUM, |
| 8, 2, (char *) valbuf + offset); |
| offset += 8; |
| break; |
| case X86_64_MEMORY_CLASS: |
| default: |
| internal_error (__FILE__, __LINE__, |
| "Unexpected argument class"); |
| } |
| } |
| } |
| } |
| |
| static void |
| x86_64_frame_init_saved_regs (struct frame_info *fi) |
| { |
| /* Do nothing. Everything is handled by the stack unwinding code. */ |
| } |
| |
| #define INT_REGS 6 |
| #define SSE_REGS 16 |
| |
| CORE_ADDR |
| x86_64_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| int struct_return, CORE_ADDR struct_addr) |
| { |
| int intreg = 0; |
| int ssereg = 0; |
| int i; |
| static int int_parameter_registers[INT_REGS] = { |
| 5 /* RDI */ , 4 /* RSI */ , |
| 3 /* RDX */ , 2 /* RCX */ , |
| 8 /* R8 */ , 9 /* R9 */ |
| }; |
| /* XMM0 - XMM15 */ |
| static int sse_parameter_registers[SSE_REGS] = { |
| XMM1_REGNUM - 1, XMM1_REGNUM, XMM1_REGNUM + 1, XMM1_REGNUM + 2, |
| XMM1_REGNUM + 3, XMM1_REGNUM + 4, XMM1_REGNUM + 5, XMM1_REGNUM + 6, |
| XMM1_REGNUM + 7, XMM1_REGNUM + 8, XMM1_REGNUM + 9, XMM1_REGNUM + 10, |
| XMM1_REGNUM + 11, XMM1_REGNUM + 12, XMM1_REGNUM + 13, XMM1_REGNUM + 14 |
| }; |
| int stack_values_count = 0; |
| int *stack_values; |
| stack_values = alloca (nargs * sizeof (int)); |
| for (i = 0; i < nargs; i++) |
| { |
| enum x86_64_reg_class class[MAX_CLASSES]; |
| int n = classify_argument (args[i]->type, class, 0); |
| int needed_intregs; |
| int needed_sseregs; |
| |
| if (!n || |
| !examine_argument (class, n, &needed_intregs, &needed_sseregs) |
| || intreg / 2 + needed_intregs > INT_REGS |
| || ssereg / 2 + needed_sseregs > SSE_REGS) |
| { /* memory class */ |
| stack_values[stack_values_count++] = i; |
| } |
| else |
| { |
| int j; |
| for (j = 0; j < n; j++) |
| { |
| int offset = 0; |
| switch (class[j]) |
| { |
| case X86_64_NO_CLASS: |
| break; |
| case X86_64_INTEGER_CLASS: |
| deprecated_write_register_gen (int_parameter_registers |
| [(intreg + 1) / 2], |
| VALUE_CONTENTS_ALL (args[i]) + offset); |
| offset += 8; |
| intreg += 2; |
| break; |
| case X86_64_INTEGERSI_CLASS: |
| deprecated_write_register_gen (int_parameter_registers[intreg / 2], |
| VALUE_CONTENTS_ALL (args[i]) + offset); |
| offset += 8; |
| intreg++; |
| break; |
| case X86_64_SSEDF_CLASS: |
| case X86_64_SSESF_CLASS: |
| case X86_64_SSE_CLASS: |
| deprecated_write_register_gen (sse_parameter_registers |
| [(ssereg + 1) / 2], |
| VALUE_CONTENTS_ALL (args[i]) + offset); |
| offset += 8; |
| ssereg += 2; |
| break; |
| case X86_64_SSEUP_CLASS: |
| deprecated_write_register_gen (sse_parameter_registers[ssereg / 2], |
| VALUE_CONTENTS_ALL (args[i]) + offset); |
| offset += 8; |
| ssereg++; |
| break; |
| case X86_64_X87_CLASS: |
| case X86_64_MEMORY_CLASS: |
| stack_values[stack_values_count++] = i; |
| break; |
| case X86_64_X87UP_CLASS: |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, |
| "Unexpected argument class"); |
| } |
| intreg += intreg % 2; |
| ssereg += ssereg % 2; |
| } |
| } |
| } |
| while (--stack_values_count >= 0) |
| { |
| struct value *arg = args[stack_values[stack_values_count]]; |
| int len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg)); |
| len += 7; |
| len -= len % 8; |
| sp -= len; |
| write_memory (sp, VALUE_CONTENTS_ALL (arg), len); |
| } |
| return sp; |
| } |
| |
| /* Write into the appropriate registers a function return value stored |
| in VALBUF of type TYPE, given in virtual format. */ |
| void |
| x86_64_store_return_value (struct type *type, struct regcache *regcache, |
| const void *valbuf) |
| { |
| int len = TYPE_LENGTH (type); |
| |
| if (TYPE_CODE_FLT == TYPE_CODE (type)) |
| { |
| /* Floating-point return values can be found in %st(0). */ |
| if (len == TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT |
| && TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) |
| { |
| /* Copy straight over. */ |
| regcache_cooked_write (regcache, FP0_REGNUM, valbuf); |
| } |
| else |
| { |
| char buf[FPU_REG_RAW_SIZE]; |
| DOUBLEST val; |
| |
| /* Convert the value found in VALBUF to the extended |
| floating point format used by the FPU. This is probably |
| not exactly how it would happen on the target itself, but |
| it is the best we can do. */ |
| val = extract_floating (valbuf, TYPE_LENGTH (type)); |
| floatformat_from_doublest (&floatformat_i387_ext, &val, buf); |
| regcache_cooked_write_part (regcache, FP0_REGNUM, |
| 0, FPU_REG_RAW_SIZE, buf); |
| } |
| } |
| else |
| { |
| int low_size = REGISTER_RAW_SIZE (0); |
| int high_size = REGISTER_RAW_SIZE (1); |
| |
| if (len <= low_size) |
| regcache_cooked_write_part (regcache, 0, 0, len, valbuf); |
| else if (len <= (low_size + high_size)) |
| { |
| regcache_cooked_write_part (regcache, 0, 0, low_size, valbuf); |
| regcache_cooked_write_part (regcache, 1, 0, |
| len - low_size, |
| (const char *) valbuf + low_size); |
| } |
| else |
| internal_error (__FILE__, __LINE__, |
| "Cannot store return value of %d bytes long.", len); |
| } |
| } |
| |
| |
| const char * |
| x86_64_register_name (int reg_nr) |
| { |
| if (reg_nr < 0 || reg_nr >= X86_64_NUM_REGS) |
| return NULL; |
| return x86_64_register_info_table[reg_nr].name; |
| } |
| |
| int |
| x86_64_register_number (const char *name) |
| { |
| int reg_nr; |
| |
| for (reg_nr = 0; reg_nr < X86_64_NUM_REGS; reg_nr++) |
| if (strcmp (name, x86_64_register_info_table[reg_nr].name) == 0) |
| return reg_nr; |
| return -1; |
| } |
| |
| |
| |
| /* We have two flavours of disassembly. The machinery on this page |
| deals with switching between those. */ |
| |
| static int |
| gdb_print_insn_x86_64 (bfd_vma memaddr, disassemble_info * info) |
| { |
| if (disassembly_flavour == att_flavour) |
| return print_insn_i386_att (memaddr, info); |
| else if (disassembly_flavour == intel_flavour) |
| return print_insn_i386_intel (memaddr, info); |
| /* Never reached -- disassembly_flavour is always either att_flavour |
| or intel_flavour. */ |
| internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
| } |
| |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. This is called from call_function. */ |
| void |
| x86_64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| { |
| write_register (RDI_REGNUM, addr); |
| } |
| |
| int |
| x86_64_frameless_function_invocation (struct frame_info *frame) |
| { |
| return 0; |
| } |
| |
| /* We will handle only functions beginning with: |
| 55 pushq %rbp |
| 48 89 e5 movq %rsp,%rbp |
| Any function that doesn't start with this sequence |
| will be assumed to have no prologue and thus no valid |
| frame pointer in %rbp. */ |
| #define PROLOG_BUFSIZE 4 |
| int |
| x86_64_function_has_prologue (CORE_ADDR pc) |
| { |
| int i; |
| unsigned char prolog_expect[PROLOG_BUFSIZE] = { 0x55, 0x48, 0x89, 0xe5 }, |
| prolog_buf[PROLOG_BUFSIZE]; |
| |
| read_memory (pc, (char *) prolog_buf, PROLOG_BUFSIZE); |
| |
| /* First check, whether pc points to pushq %rbp, movq %rsp,%rbp. */ |
| for (i = 0; i < PROLOG_BUFSIZE; i++) |
| if (prolog_expect[i] != prolog_buf[i]) |
| return 0; /* ... no, it doesn't. Nothing to skip. */ |
| |
| return 1; |
| } |
| |
| /* If a function with debugging information and known beginning |
| is detected, we will return pc of the next line in the source |
| code. With this approach we effectively skip the prolog. */ |
| |
| CORE_ADDR |
| x86_64_skip_prologue (CORE_ADDR pc) |
| { |
| int i; |
| struct symtab_and_line v_sal; |
| struct symbol *v_function; |
| CORE_ADDR endaddr; |
| |
| if (! x86_64_function_has_prologue (pc)) |
| return pc; |
| |
| /* OK, we have found the prologue and want PC of the first |
| non-prologue instruction. */ |
| pc += PROLOG_BUFSIZE; |
| |
| v_function = find_pc_function (pc); |
| v_sal = find_pc_line (pc, 0); |
| |
| /* If pc doesn't point to a function with debuginfo, some of the |
| following may be NULL. */ |
| if (!v_function || !v_function->ginfo.value.block || !v_sal.symtab) |
| return pc; |
| |
| endaddr = BLOCK_END (SYMBOL_BLOCK_VALUE (v_function)); |
| |
| for (i = 0; i < v_sal.symtab->linetable->nitems; i++) |
| if (v_sal.symtab->linetable->item[i].pc >= pc |
| && v_sal.symtab->linetable->item[i].pc < endaddr) |
| { |
| pc = v_sal.symtab->linetable->item[i].pc; |
| break; |
| } |
| |
| return pc; |
| } |
| |
| /* Sequence of bytes for breakpoint instruction. */ |
| static const unsigned char * |
| x86_64_breakpoint_from_pc (CORE_ADDR *pc, int *lenptr) |
| { |
| static unsigned char breakpoint[] = { 0xcc }; |
| *lenptr = 1; |
| return breakpoint; |
| } |
| |
| static void |
| x86_64_save_dummy_frame_tos (CORE_ADDR sp) |
| { |
| /* We must add the size of the return address that is already |
| put on the stack. */ |
| generic_save_dummy_frame_tos (sp + |
| TYPE_LENGTH (builtin_type_void_func_ptr)); |
| } |
| |
| static struct frame_id |
| x86_64_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *frame) |
| { |
| struct frame_id id; |
| |
| id.pc = frame_pc_unwind (frame); |
| frame_unwind_unsigned_register (frame, SP_REGNUM, &id.base); |
| |
| return id; |
| } |
| |
| void |
| x86_64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| int i, sum; |
| |
| /* The x86-64 has 16 SSE registers. */ |
| tdep->num_xmm_regs = 16; |
| |
| /* This is what all the fuss is about. */ |
| set_gdbarch_long_bit (gdbarch, 64); |
| set_gdbarch_long_long_bit (gdbarch, 64); |
| set_gdbarch_ptr_bit (gdbarch, 64); |
| |
| /* In contrast to the i386, on the x86-64 a `long double' actually |
| takes up 128 bits, even though it's still based on the i387 |
| extended floating-point format which has only 80 significant bits. */ |
| set_gdbarch_long_double_bit (gdbarch, 128); |
| |
| set_gdbarch_num_regs (gdbarch, X86_64_NUM_REGS); |
| |
| /* Register numbers of various important registers. */ |
| set_gdbarch_sp_regnum (gdbarch, 7); /* %rsp */ |
| set_gdbarch_fp_regnum (gdbarch, 6); /* %rbp */ |
| set_gdbarch_pc_regnum (gdbarch, 16); /* %rip */ |
| set_gdbarch_ps_regnum (gdbarch, 17); /* %eflags */ |
| set_gdbarch_fp0_regnum (gdbarch, X86_64_NUM_GREGS); /* %st(0) */ |
| |
| /* The "default" register numbering scheme for the x86-64 is |
| referred to as the "DWARF register number mapping" in the psABI. |
| The preferred debugging format for all known x86-64 targets is |
| actually DWARF2, and GCC doesn't seem to support DWARF (that is |
| DWARF-1), but we provide the same mapping just in case. This |
| mapping is also used for stabs, which GCC does support. */ |
| set_gdbarch_stab_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum); |
| set_gdbarch_dwarf_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum); |
| set_gdbarch_dwarf2_reg_to_regnum (gdbarch, x86_64_dwarf2_reg_to_regnum); |
| |
| /* We don't override SDB_REG_RO_REGNUM, sice COFF doesn't seem to be |
| in use on any of the supported x86-64 targets. */ |
| |
| set_gdbarch_register_name (gdbarch, x86_64_register_name); |
| set_gdbarch_register_size (gdbarch, 8); |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register (SIZEOF_GREGS + SIZEOF_FPU_REGS + SIZEOF_FPU_CTRL_REGS + |
| SIZEOF_SSE_REGS) */ |
| for (i = 0, sum = 0; i < X86_64_NUM_REGS; i++) |
| sum += x86_64_register_info_table[i].size; |
| set_gdbarch_register_bytes (gdbarch, sum); |
| |
| set_gdbarch_register_raw_size (gdbarch, x86_64_register_raw_size); |
| set_gdbarch_register_byte (gdbarch, x86_64_register_byte); |
| set_gdbarch_register_virtual_type (gdbarch, x86_64_register_virtual_type); |
| |
| set_gdbarch_register_convertible (gdbarch, x86_64_register_convertible); |
| set_gdbarch_register_convert_to_virtual (gdbarch, |
| x86_64_register_convert_to_virtual); |
| set_gdbarch_register_convert_to_raw (gdbarch, |
| x86_64_register_convert_to_raw); |
| |
| /* Getting saved registers is handled by unwind information. */ |
| set_gdbarch_deprecated_get_saved_register (gdbarch, cfi_get_saved_register); |
| |
| /* FIXME: kettenis/20021026: Should we set parm_boundary to 64 here? */ |
| set_gdbarch_read_fp (gdbarch, cfi_read_fp); |
| |
| set_gdbarch_extract_return_value (gdbarch, x86_64_extract_return_value); |
| |
| set_gdbarch_push_arguments (gdbarch, x86_64_push_arguments); |
| set_gdbarch_push_return_address (gdbarch, x86_64_push_return_address); |
| set_gdbarch_deprecated_pop_frame (gdbarch, x86_64_pop_frame); |
| set_gdbarch_store_struct_return (gdbarch, x86_64_store_struct_return); |
| set_gdbarch_store_return_value (gdbarch, x86_64_store_return_value); |
| /* Override, since this is handled by x86_64_extract_return_value. */ |
| set_gdbarch_extract_struct_value_address (gdbarch, NULL); |
| set_gdbarch_use_struct_convention (gdbarch, x86_64_use_struct_convention); |
| |
| set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, x86_64_frame_init_saved_regs); |
| set_gdbarch_skip_prologue (gdbarch, x86_64_skip_prologue); |
| |
| set_gdbarch_frame_chain (gdbarch, x86_64_linux_frame_chain); |
| set_gdbarch_frameless_function_invocation (gdbarch, |
| x86_64_frameless_function_invocation); |
| /* FIXME: kettenis/20021026: These two are GNU/Linux-specific and |
| should be moved elsewhere. */ |
| set_gdbarch_deprecated_frame_saved_pc (gdbarch, x86_64_linux_frame_saved_pc); |
| set_gdbarch_saved_pc_after_call (gdbarch, x86_64_linux_saved_pc_after_call); |
| set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| /* FIXME: kettenis/20021026: This one is GNU/Linux-specific too. */ |
| set_gdbarch_pc_in_sigtramp (gdbarch, x86_64_linux_in_sigtramp); |
| |
| set_gdbarch_num_pseudo_regs (gdbarch, 0); |
| |
| /* Build call frame information (CFI) from DWARF2 frame debug info. */ |
| set_gdbarch_dwarf2_build_frame_info (gdbarch, dwarf2_build_frame_info); |
| |
| /* Initialization of per-frame CFI. */ |
| set_gdbarch_deprecated_init_extra_frame_info (gdbarch, cfi_init_extra_frame_info); |
| |
| /* Frame PC initialization is handled by using CFI. */ |
| set_gdbarch_deprecated_init_frame_pc (gdbarch, x86_64_init_frame_pc); |
| |
| /* Cons up virtual frame pointer for trace. */ |
| set_gdbarch_virtual_frame_pointer (gdbarch, cfi_virtual_frame_pointer); |
| |
| /* FIXME: kettenis/20021026: This is ELF-specific. Fine for now, |
| since all supported x86-64 targets are ELF, but that might change |
| in the future. */ |
| set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); |
| |
| /* Dummy frame helper functions. */ |
| set_gdbarch_save_dummy_frame_tos (gdbarch, x86_64_save_dummy_frame_tos); |
| set_gdbarch_unwind_dummy_id (gdbarch, x86_64_unwind_dummy_id); |
| } |
| |
| void |
| _initialize_x86_64_tdep (void) |
| { |
| /* Initialize the table saying where each register starts in the |
| register file. */ |
| { |
| int i, offset; |
| |
| offset = 0; |
| for (i = 0; i < X86_64_NUM_REGS; i++) |
| { |
| x86_64_register_byte_table[i] = offset; |
| offset += x86_64_register_info_table[i].size; |
| } |
| } |
| } |