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/* Target-dependent code for AMD64. Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 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 "arch-utils.h" #include "block.h" #include "dummy-frame.h" #include "frame.h" #include "frame-base.h" #include "frame-unwind.h" #include "inferior.h" #include "gdbcmd.h" #include "gdbcore.h" #include "objfiles.h" #include "regcache.h" #include "regset.h" #include "symfile.h" #include "gdb_assert.h" #include "amd64-tdep.h" #include "i387-tdep.h" /* Note that the AMD64 architecture was previously known as x86-64. The latter is (forever) engraved into the canonical system name as returned by config.guess, and used as the name for the AMD64 port of GNU/Linux. The BSD's have renamed their ports to amd64; they don't like to shout. For GDB we prefer the amd64_-prefix over the x86_64_-prefix since it's so much easier to type. */ /* Register information. */ static const char *amd64_register_names[] = { "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "rsp", /* %r8 is indeed register number 8. */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rip", "eflags", "cs", "ss", "ds", "es", "fs", "gs", /* %st0 is register number 24. */ "st0", "st1", "st2", "st3", "st4", "st5", "st6", "st7", "fctrl", "fstat", "ftag", "fiseg", "fioff", "foseg", "fooff", "fop", /* %xmm0 is register number 40. */ "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15", "mxcsr", }; /* Total number of registers. */ #define AMD64_NUM_REGS ARRAY_SIZE (amd64_register_names) /* Return the name of register REGNUM. */ const char * amd64_register_name (struct gdbarch *gdbarch, int regnum) { if (regnum >= 0 && regnum < AMD64_NUM_REGS) return amd64_register_names[regnum]; return NULL; } /* Return the GDB type object for the "standard" data type of data in register REGNUM. */ struct type * amd64_register_type (struct gdbarch *gdbarch, int regnum) { if (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_RDI_REGNUM) return builtin_type_int64; if (regnum == AMD64_RBP_REGNUM || regnum == AMD64_RSP_REGNUM) return builtin_type_void_data_ptr; if (regnum >= AMD64_R8_REGNUM && regnum <= AMD64_R15_REGNUM) return builtin_type_int64; if (regnum == AMD64_RIP_REGNUM) return builtin_type_void_func_ptr; if (regnum == AMD64_EFLAGS_REGNUM) return i386_eflags_type; if (regnum >= AMD64_CS_REGNUM && regnum <= AMD64_GS_REGNUM) return builtin_type_int32; if (regnum >= AMD64_ST0_REGNUM && regnum <= AMD64_ST0_REGNUM + 7) return builtin_type_i387_ext; if (regnum >= AMD64_FCTRL_REGNUM && regnum <= AMD64_FCTRL_REGNUM + 7) return builtin_type_int32; if (regnum >= AMD64_XMM0_REGNUM && regnum <= AMD64_XMM0_REGNUM + 15) return i386_sse_type (gdbarch); if (regnum == AMD64_MXCSR_REGNUM) return i386_mxcsr_type; internal_error (__FILE__, __LINE__, _("invalid regnum")); } /* DWARF Register Number Mapping as defined in the System V psABI, section 3.6. */ static int amd64_dwarf_regmap[] = { /* General Purpose Registers RAX, RDX, RCX, RBX, RSI, RDI. */ AMD64_RAX_REGNUM, AMD64_RDX_REGNUM, AMD64_RCX_REGNUM, AMD64_RBX_REGNUM, AMD64_RSI_REGNUM, AMD64_RDI_REGNUM, /* Frame Pointer Register RBP. */ AMD64_RBP_REGNUM, /* Stack Pointer Register RSP. */ AMD64_RSP_REGNUM, /* Extended Integer Registers 8 - 15. */ 8, 9, 10, 11, 12, 13, 14, 15, /* Return Address RA. Mapped to RIP. */ AMD64_RIP_REGNUM, /* SSE Registers 0 - 7. */ AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM, AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3, AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5, AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7, /* Extended SSE Registers 8 - 15. */ AMD64_XMM0_REGNUM + 8, AMD64_XMM0_REGNUM + 9, AMD64_XMM0_REGNUM + 10, AMD64_XMM0_REGNUM + 11, AMD64_XMM0_REGNUM + 12, AMD64_XMM0_REGNUM + 13, AMD64_XMM0_REGNUM + 14, AMD64_XMM0_REGNUM + 15, /* Floating Point Registers 0-7. */ AMD64_ST0_REGNUM + 0, AMD64_ST0_REGNUM + 1, AMD64_ST0_REGNUM + 2, AMD64_ST0_REGNUM + 3, AMD64_ST0_REGNUM + 4, AMD64_ST0_REGNUM + 5, AMD64_ST0_REGNUM + 6, AMD64_ST0_REGNUM + 7, /* Control and Status Flags Register. */ AMD64_EFLAGS_REGNUM, /* Selector Registers. */ AMD64_ES_REGNUM, AMD64_CS_REGNUM, AMD64_SS_REGNUM, AMD64_DS_REGNUM, AMD64_FS_REGNUM, AMD64_GS_REGNUM, -1, -1, /* Segment Base Address Registers. */ -1, -1, -1, -1, /* Special Selector Registers. */ -1, -1, /* Floating Point Control Registers. */ AMD64_MXCSR_REGNUM, AMD64_FCTRL_REGNUM, AMD64_FSTAT_REGNUM }; static const int amd64_dwarf_regmap_len = (sizeof (amd64_dwarf_regmap) / sizeof (amd64_dwarf_regmap[0])); /* Convert DWARF register number REG to the appropriate register number used by GDB. */ static int amd64_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) { int regnum = -1; if (reg >= 0 && reg < amd64_dwarf_regmap_len) regnum = amd64_dwarf_regmap[reg]; if (regnum == -1) warning (_("Unmapped DWARF Register #%d encountered."), reg); return regnum; } /* Register classes as defined in the psABI. */ enum amd64_reg_class { AMD64_INTEGER, AMD64_SSE, AMD64_SSEUP, AMD64_X87, AMD64_X87UP, AMD64_COMPLEX_X87, AMD64_NO_CLASS, AMD64_MEMORY }; /* Return the union class of CLASS1 and CLASS2. See the psABI for details. */ static enum amd64_reg_class amd64_merge_classes (enum amd64_reg_class class1, enum amd64_reg_class class2) { /* Rule (a): If both classes are equal, this is the resulting class. */ if (class1 == class2) return class1; /* Rule (b): If one of the classes is NO_CLASS, the resulting class is the other class. */ if (class1 == AMD64_NO_CLASS) return class2; if (class2 == AMD64_NO_CLASS) return class1; /* Rule (c): If one of the classes is MEMORY, the result is MEMORY. */ if (class1 == AMD64_MEMORY || class2 == AMD64_MEMORY) return AMD64_MEMORY; /* Rule (d): If one of the classes is INTEGER, the result is INTEGER. */ if (class1 == AMD64_INTEGER || class2 == AMD64_INTEGER) return AMD64_INTEGER; /* Rule (e): If one of the classes is X87, X87UP, COMPLEX_X87 class, MEMORY is used as class. */ if (class1 == AMD64_X87 || class1 == AMD64_X87UP || class1 == AMD64_COMPLEX_X87 || class2 == AMD64_X87 || class2 == AMD64_X87UP || class2 == AMD64_COMPLEX_X87) return AMD64_MEMORY; /* Rule (f): Otherwise class SSE is used. */ return AMD64_SSE; } static void amd64_classify (struct type *type, enum amd64_reg_class class[2]); /* Return non-zero if TYPE is a non-POD structure or union type. */ static int amd64_non_pod_p (struct type *type) { /* ??? A class with a base class certainly isn't POD, but does this catch all non-POD structure types? */ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_N_BASECLASSES (type) > 0) return 1; return 0; } /* Classify TYPE according to the rules for aggregate (structures and arrays) and union types, and store the result in CLASS. */ static void amd64_classify_aggregate (struct type *type, enum amd64_reg_class class[2]) { int len = TYPE_LENGTH (type); /* 1. If the size of an object is larger than two eightbytes, or in C++, is a non-POD structure or union type, or contains unaligned fields, it has class memory. */ if (len > 16 || amd64_non_pod_p (type)) { class[0] = class[1] = AMD64_MEMORY; return; } /* 2. Both eightbytes get initialized to class NO_CLASS. */ class[0] = class[1] = AMD64_NO_CLASS; /* 3. Each field of an object is classified recursively so that always two fields are considered. The resulting class is calculated according to the classes of the fields in the eightbyte: */ if (TYPE_CODE (type) == TYPE_CODE_ARRAY) { struct type *subtype = check_typedef (TYPE_TARGET_TYPE (type)); /* All fields in an array have the same type. */ amd64_classify (subtype, class); if (len > 8 && class[1] == AMD64_NO_CLASS) class[1] = class[0]; } else { int i; /* Structure or union. */ gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT || TYPE_CODE (type) == TYPE_CODE_UNION); for (i = 0; i < TYPE_NFIELDS (type); i++) { struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i)); int pos = TYPE_FIELD_BITPOS (type, i) / 64; enum amd64_reg_class subclass[2]; /* Ignore static fields. */ if (TYPE_FIELD_STATIC (type, i)) continue; gdb_assert (pos == 0 || pos == 1); amd64_classify (subtype, subclass); class[pos] = amd64_merge_classes (class[pos], subclass[0]); if (pos == 0) class[1] = amd64_merge_classes (class[1], subclass[1]); } } /* 4. Then a post merger cleanup is done: */ /* Rule (a): If one of the classes is MEMORY, the whole argument is passed in memory. */ if (class[0] == AMD64_MEMORY || class[1] == AMD64_MEMORY) class[0] = class[1] = AMD64_MEMORY; /* Rule (b): If SSEUP is not preceeded by SSE, it is converted to SSE. */ if (class[0] == AMD64_SSEUP) class[0] = AMD64_SSE; if (class[1] == AMD64_SSEUP && class[0] != AMD64_SSE) class[1] = AMD64_SSE; } /* Classify TYPE, and store the result in CLASS. */ static void amd64_classify (struct type *type, enum amd64_reg_class class[2]) { enum type_code code = TYPE_CODE (type); int len = TYPE_LENGTH (type); class[0] = class[1] = AMD64_NO_CLASS; /* Arguments of types (signed and unsigned) _Bool, char, short, int, long, long long, and pointers are in the INTEGER class. Similarly, range types, used by languages such as Ada, are also in the INTEGER class. */ if ((code == TYPE_CODE_INT || code == TYPE_CODE_ENUM || code == TYPE_CODE_BOOL || code == TYPE_CODE_RANGE || code == TYPE_CODE_CHAR || code == TYPE_CODE_PTR || code == TYPE_CODE_REF) && (len == 1 || len == 2 || len == 4 || len == 8)) class[0] = AMD64_INTEGER; /* Arguments of types float, double, _Decimal32, _Decimal64 and __m64 are in class SSE. */ else if ((code == TYPE_CODE_FLT || code == TYPE_CODE_DECFLOAT) && (len == 4 || len == 8)) /* FIXME: __m64 . */ class[0] = AMD64_SSE; /* Arguments of types __float128, _Decimal128 and __m128 are split into two halves. The least significant ones belong to class SSE, the most significant one to class SSEUP. */ else if (code == TYPE_CODE_DECFLOAT && len == 16) /* FIXME: __float128, __m128. */ class[0] = AMD64_SSE, class[1] = AMD64_SSEUP; /* The 64-bit mantissa of arguments of type long double belongs to class X87, the 16-bit exponent plus 6 bytes of padding belongs to class X87UP. */ else if (code == TYPE_CODE_FLT && len == 16) /* Class X87 and X87UP. */ class[0] = AMD64_X87, class[1] = AMD64_X87UP; /* Aggregates. */ else if (code == TYPE_CODE_ARRAY || code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) amd64_classify_aggregate (type, class); } static enum return_value_convention amd64_return_value (struct gdbarch *gdbarch, struct type *type, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf) { enum amd64_reg_class class[2]; int len = TYPE_LENGTH (type); static int integer_regnum[] = { AMD64_RAX_REGNUM, AMD64_RDX_REGNUM }; static int sse_regnum[] = { AMD64_XMM0_REGNUM, AMD64_XMM1_REGNUM }; int integer_reg = 0; int sse_reg = 0; int i; gdb_assert (!(readbuf && writebuf)); /* 1. Classify the return type with the classification algorithm. */ amd64_classify (type, class); /* 2. If the type has class MEMORY, then the caller provides space for the return value and passes the address of this storage in %rdi as if it were the first argument to the function. In effect, this address becomes a hidden first argument. On return %rax will contain the address that has been passed in by the caller in %rdi. */ if (class[0] == AMD64_MEMORY) { /* As indicated by the comment above, the ABI guarantees that we can always find the return value just after the function has returned. */ if (readbuf) { ULONGEST addr; regcache_raw_read_unsigned (regcache, AMD64_RAX_REGNUM, &addr); read_memory (addr, readbuf, TYPE_LENGTH (type)); } return RETURN_VALUE_ABI_RETURNS_ADDRESS; } gdb_assert (class[1] != AMD64_MEMORY); gdb_assert (len <= 16); for (i = 0; len > 0; i++, len -= 8) { int regnum = -1; int offset = 0; switch (class[i]) { case AMD64_INTEGER: /* 3. If the class is INTEGER, the next available register of the sequence %rax, %rdx is used. */ regnum = integer_regnum[integer_reg++]; break; case AMD64_SSE: /* 4. If the class is SSE, the next available SSE register of the sequence %xmm0, %xmm1 is used. */ regnum = sse_regnum[sse_reg++]; break; case AMD64_SSEUP: /* 5. If the class is SSEUP, the eightbyte is passed in the upper half of the last used SSE register. */ gdb_assert (sse_reg > 0); regnum = sse_regnum[sse_reg - 1]; offset = 8; break; case AMD64_X87: /* 6. If the class is X87, the value is returned on the X87 stack in %st0 as 80-bit x87 number. */ regnum = AMD64_ST0_REGNUM; if (writebuf) i387_return_value (gdbarch, regcache); break; case AMD64_X87UP: /* 7. If the class is X87UP, the value is returned together with the previous X87 value in %st0. */ gdb_assert (i > 0 && class[0] == AMD64_X87); regnum = AMD64_ST0_REGNUM; offset = 8; len = 2; break; case AMD64_NO_CLASS: continue; default: gdb_assert (!"Unexpected register class."); } gdb_assert (regnum != -1); if (readbuf) regcache_raw_read_part (regcache, regnum, offset, min (len, 8), readbuf + i * 8); if (writebuf) regcache_raw_write_part (regcache, regnum, offset, min (len, 8), writebuf + i * 8); } return RETURN_VALUE_REGISTER_CONVENTION; } static CORE_ADDR amd64_push_arguments (struct regcache *regcache, int nargs, struct value **args, CORE_ADDR sp, int struct_return) { static int integer_regnum[] = { AMD64_RDI_REGNUM, /* %rdi */ AMD64_RSI_REGNUM, /* %rsi */ AMD64_RDX_REGNUM, /* %rdx */ AMD64_RCX_REGNUM, /* %rcx */ 8, /* %r8 */ 9 /* %r9 */ }; static int sse_regnum[] = { /* %xmm0 ... %xmm7 */ AMD64_XMM0_REGNUM + 0, AMD64_XMM1_REGNUM, AMD64_XMM0_REGNUM + 2, AMD64_XMM0_REGNUM + 3, AMD64_XMM0_REGNUM + 4, AMD64_XMM0_REGNUM + 5, AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7, }; struct value **stack_args = alloca (nargs * sizeof (struct value *)); int num_stack_args = 0; int num_elements = 0; int element = 0; int integer_reg = 0; int sse_reg = 0; int i; /* Reserve a register for the "hidden" argument. */ if (struct_return) integer_reg++; for (i = 0; i < nargs; i++) { struct type *type = value_type (args[i]); int len = TYPE_LENGTH (type); enum amd64_reg_class class[2]; int needed_integer_regs = 0; int needed_sse_regs = 0; int j; /* Classify argument. */ amd64_classify (type, class); /* Calculate the number of integer and SSE registers needed for this argument. */ for (j = 0; j < 2; j++) { if (class[j] == AMD64_INTEGER) needed_integer_regs++; else if (class[j] == AMD64_SSE) needed_sse_regs++; } /* Check whether enough registers are available, and if the argument should be passed in registers at all. */ if (integer_reg + needed_integer_regs > ARRAY_SIZE (integer_regnum) || sse_reg + needed_sse_regs > ARRAY_SIZE (sse_regnum) || (needed_integer_regs == 0 && needed_sse_regs == 0)) { /* The argument will be passed on the stack. */ num_elements += ((len + 7) / 8); stack_args[num_stack_args++] = args[i]; } else { /* The argument will be passed in registers. */ const gdb_byte *valbuf = value_contents (args[i]); gdb_byte buf[8]; gdb_assert (len <= 16); for (j = 0; len > 0; j++, len -= 8) { int regnum = -1; int offset = 0; switch (class[j]) { case AMD64_INTEGER: regnum = integer_regnum[integer_reg++]; break; case AMD64_SSE: regnum = sse_regnum[sse_reg++]; break; case AMD64_SSEUP: gdb_assert (sse_reg > 0); regnum = sse_regnum[sse_reg - 1]; offset = 8; break; default: gdb_assert (!"Unexpected register class."); } gdb_assert (regnum != -1); memset (buf, 0, sizeof buf); memcpy (buf, valbuf + j * 8, min (len, 8)); regcache_raw_write_part (regcache, regnum, offset, 8, buf); } } } /* Allocate space for the arguments on the stack. */ sp -= num_elements * 8; /* The psABI says that "The end of the input argument area shall be aligned on a 16 byte boundary." */ sp &= ~0xf; /* Write out the arguments to the stack. */ for (i = 0; i < num_stack_args; i++) { struct type *type = value_type (stack_args[i]); const gdb_byte *valbuf = value_contents (stack_args[i]); int len = TYPE_LENGTH (type); write_memory (sp + element * 8, valbuf, len); element += ((len + 7) / 8); } /* The psABI says that "For calls that may call functions that use varargs or stdargs (prototype-less calls or calls to functions containing ellipsis (...) in the declaration) %al is used as hidden argument to specify the number of SSE registers used. */ regcache_raw_write_unsigned (regcache, AMD64_RAX_REGNUM, sse_reg); return sp; } static CORE_ADDR amd64_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct regcache *regcache, CORE_ADDR bp_addr, int nargs, struct value **args, CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr) { gdb_byte buf[8]; /* Pass arguments. */ sp = amd64_push_arguments (regcache, nargs, args, sp, struct_return); /* Pass "hidden" argument". */ if (struct_return) { store_unsigned_integer (buf, 8, struct_addr); regcache_cooked_write (regcache, AMD64_RDI_REGNUM, buf); } /* Store return address. */ sp -= 8; store_unsigned_integer (buf, 8, bp_addr); write_memory (sp, buf, 8); /* Finally, update the stack pointer... */ store_unsigned_integer (buf, 8, sp); regcache_cooked_write (regcache, AMD64_RSP_REGNUM, buf); /* ...and fake a frame pointer. */ regcache_cooked_write (regcache, AMD64_RBP_REGNUM, buf); return sp + 16; } /* The maximum number of saved registers. This should include %rip. */ #define AMD64_NUM_SAVED_REGS AMD64_NUM_GREGS struct amd64_frame_cache { /* Base address. */ CORE_ADDR base; CORE_ADDR sp_offset; CORE_ADDR pc; /* Saved registers. */ CORE_ADDR saved_regs[AMD64_NUM_SAVED_REGS]; CORE_ADDR saved_sp; /* Do we have a frame? */ int frameless_p; }; /* Initialize a frame cache. */ static void amd64_init_frame_cache (struct amd64_frame_cache *cache) { int i; /* Base address. */ cache->base = 0; cache->sp_offset = -8; cache->pc = 0; /* Saved registers. We initialize these to -1 since zero is a valid offset (that's where %rbp is supposed to be stored). */ for (i = 0; i < AMD64_NUM_SAVED_REGS; i++) cache->saved_regs[i] = -1; cache->saved_sp = 0; /* Frameless until proven otherwise. */ cache->frameless_p = 1; } /* Allocate and initialize a frame cache. */ static struct amd64_frame_cache * amd64_alloc_frame_cache (void) { struct amd64_frame_cache *cache; cache = FRAME_OBSTACK_ZALLOC (struct amd64_frame_cache); amd64_init_frame_cache (cache); return cache; } /* Do a limited 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 will handle only functions beginning with: pushq %rbp 0x55 movq %rsp, %rbp 0x48 0x89 0xe5 Any function that doesn't start with this sequence will be assumed to have no prologue and thus no valid frame pointer in %rbp. */ static CORE_ADDR amd64_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, struct amd64_frame_cache *cache) { static gdb_byte proto[3] = { 0x48, 0x89, 0xe5 }; /* movq %rsp, %rbp */ gdb_byte buf[3]; gdb_byte op; if (current_pc <= pc) return current_pc; op = read_memory_unsigned_integer (pc, 1); if (op == 0x55) /* pushq %rbp */ { /* Take into account that we've executed the `pushq %rbp' that starts this instruction sequence. */ cache->saved_regs[AMD64_RBP_REGNUM] = 0; cache->sp_offset += 8; /* If that's all, return now. */ if (current_pc <= pc + 1) return current_pc; /* Check for `movq %rsp, %rbp'. */ read_memory (pc + 1, buf, 3); if (memcmp (buf, proto, 3) != 0) return pc + 1; /* OK, we actually have a frame. */ cache->frameless_p = 0; return pc + 4; } return pc; } /* Return PC of first real instruction. */ static CORE_ADDR amd64_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) { struct amd64_frame_cache cache; CORE_ADDR pc; amd64_init_frame_cache (&cache); pc = amd64_analyze_prologue (start_pc, 0xffffffffffffffffLL, &cache); if (cache.frameless_p) return start_pc; return pc; } /* Normal frames. */ static struct amd64_frame_cache * amd64_frame_cache (struct frame_info *next_frame, void **this_cache) { struct amd64_frame_cache *cache; gdb_byte buf[8]; int i; if (*this_cache) return *this_cache; cache = amd64_alloc_frame_cache (); *this_cache = cache; cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME); if (cache->pc != 0) amd64_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); if (cache->frameless_p) { /* We didn't find a valid 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. */ frame_unwind_register (next_frame, AMD64_RSP_REGNUM, buf); cache->base = extract_unsigned_integer (buf, 8) + cache->sp_offset; } else { frame_unwind_register (next_frame, AMD64_RBP_REGNUM, buf); cache->base = extract_unsigned_integer (buf, 8); } /* Now that we have the base address for the stack frame we can calculate the value of %rsp in the calling frame. */ cache->saved_sp = cache->base + 16; /* For normal frames, %rip is stored at 8(%rbp). If we don't have a frame we find it at the same offset from the reconstructed base address. */ cache->saved_regs[AMD64_RIP_REGNUM] = 8; /* Adjust all the saved registers such that they contain addresses instead of offsets. */ for (i = 0; i < AMD64_NUM_SAVED_REGS; i++) if (cache->saved_regs[i] != -1) cache->saved_regs[i] += cache->base; return cache; } static void amd64_frame_this_id (struct frame_info *next_frame, void **this_cache, struct frame_id *this_id) { struct amd64_frame_cache *cache = amd64_frame_cache (next_frame, this_cache); /* This marks the outermost frame. */ if (cache->base == 0) return; (*this_id) = frame_id_build (cache->base + 16, cache->pc); } static void amd64_frame_prev_register (struct frame_info *next_frame, void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realnump, gdb_byte *valuep) { struct gdbarch *gdbarch = get_frame_arch (next_frame); struct amd64_frame_cache *cache = amd64_frame_cache (next_frame, this_cache); gdb_assert (regnum >= 0); if (regnum == gdbarch_sp_regnum (gdbarch) && cache->saved_sp) { *optimizedp = 0; *lvalp = not_lval; *addrp = 0; *realnump = -1; if (valuep) { /* Store the value. */ store_unsigned_integer (valuep, 8, cache->saved_sp); } return; } if (regnum < AMD64_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1) { *optimizedp = 0; *lvalp = lval_memory; *addrp = cache->saved_regs[regnum]; *realnump = -1; if (valuep) { /* Read the value in from memory. */ read_memory (*addrp, valuep, register_size (gdbarch, regnum)); } return; } *optimizedp = 0; *lvalp = lval_register; *addrp = 0; *realnump = regnum; if (valuep) frame_unwind_register (next_frame, (*realnump), valuep); } static const struct frame_unwind amd64_frame_unwind = { NORMAL_FRAME, amd64_frame_this_id, amd64_frame_prev_register }; static const struct frame_unwind * amd64_frame_sniffer (struct frame_info *next_frame) { return &amd64_frame_unwind; } /* Signal trampolines. */ /* FIXME: kettenis/20030419: Perhaps, we can unify the 32-bit and 64-bit variants. This would require using identical frame caches on both platforms. */ static struct amd64_frame_cache * amd64_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) { struct amd64_frame_cache *cache; struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame)); CORE_ADDR addr; gdb_byte buf[8]; int i; if (*this_cache) return *this_cache; cache = amd64_alloc_frame_cache (); frame_unwind_register (next_frame, AMD64_RSP_REGNUM, buf); cache->base = extract_unsigned_integer (buf, 8) - 8; addr = tdep->sigcontext_addr (next_frame); gdb_assert (tdep->sc_reg_offset); gdb_assert (tdep->sc_num_regs <= AMD64_NUM_SAVED_REGS); for (i = 0; i < tdep->sc_num_regs; i++) if (tdep->sc_reg_offset[i] != -1) cache->saved_regs[i] = addr + tdep->sc_reg_offset[i]; *this_cache = cache; return cache; } static void amd64_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, struct frame_id *this_id) { struct amd64_frame_cache *cache = amd64_sigtramp_frame_cache (next_frame, this_cache); (*this_id) = frame_id_build (cache->base + 16, frame_pc_unwind (next_frame)); } static void amd64_sigtramp_frame_prev_register (struct frame_info *next_frame, void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realnump, gdb_byte *valuep) { /* Make sure we've initialized the cache. */ amd64_sigtramp_frame_cache (next_frame, this_cache); amd64_frame_prev_register (next_frame, this_cache, regnum, optimizedp, lvalp, addrp, realnump, valuep); } static const struct frame_unwind amd64_sigtramp_frame_unwind = { SIGTRAMP_FRAME, amd64_sigtramp_frame_this_id, amd64_sigtramp_frame_prev_register }; static const struct frame_unwind * amd64_sigtramp_frame_sniffer (struct frame_info *next_frame) { struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame)); /* We shouldn't even bother if we don't have a sigcontext_addr handler. */ if (tdep->sigcontext_addr == NULL) return NULL; if (tdep->sigtramp_p != NULL) { if (tdep->sigtramp_p (next_frame)) return &amd64_sigtramp_frame_unwind; } if (tdep->sigtramp_start != 0) { CORE_ADDR pc = frame_pc_unwind (next_frame); gdb_assert (tdep->sigtramp_end != 0); if (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end) return &amd64_sigtramp_frame_unwind; } return NULL; } static CORE_ADDR amd64_frame_base_address (struct frame_info *next_frame, void **this_cache) { struct amd64_frame_cache *cache = amd64_frame_cache (next_frame, this_cache); return cache->base; } static const struct frame_base amd64_frame_base = { &amd64_frame_unwind, amd64_frame_base_address, amd64_frame_base_address, amd64_frame_base_address }; static struct frame_id amd64_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) { gdb_byte buf[8]; CORE_ADDR fp; frame_unwind_register (next_frame, AMD64_RBP_REGNUM, buf); fp = extract_unsigned_integer (buf, 8); return frame_id_build (fp + 16, frame_pc_unwind (next_frame)); } /* 16 byte align the SP per frame requirements. */ static CORE_ADDR amd64_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) { return sp & -(CORE_ADDR)16; } /* Supply register REGNUM from the buffer specified by FPREGS and LEN in the floating-point register set REGSET to register cache REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ static void amd64_supply_fpregset (const struct regset *regset, struct regcache *regcache, int regnum, const void *fpregs, size_t len) { const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); gdb_assert (len == tdep->sizeof_fpregset); amd64_supply_fxsave (regcache, regnum, fpregs); } /* Collect register REGNUM from the register cache REGCACHE and store it in the buffer specified by FPREGS and LEN as described by the floating-point register set REGSET. If REGNUM is -1, do this for all registers in REGSET. */ static void amd64_collect_fpregset (const struct regset *regset, const struct regcache *regcache, int regnum, void *fpregs, size_t len) { const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); gdb_assert (len == tdep->sizeof_fpregset); amd64_collect_fxsave (regcache, regnum, fpregs); } /* Return the appropriate register set for the core section identified by SECT_NAME and SECT_SIZE. */ static const struct regset * amd64_regset_from_core_section (struct gdbarch *gdbarch, const char *sect_name, size_t sect_size) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset) { if (tdep->fpregset == NULL) tdep->fpregset = regset_alloc (gdbarch, amd64_supply_fpregset, amd64_collect_fpregset); return tdep->fpregset; } return i386_regset_from_core_section (gdbarch, sect_name, sect_size); } void amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* AMD64 generally uses `fxsave' instead of `fsave' for saving its floating-point registers. */ tdep->sizeof_fpregset = I387_SIZEOF_FXSAVE; /* AMD64 has an FPU and 16 SSE registers. */ tdep->st0_regnum = AMD64_ST0_REGNUM; 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 AMD64 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, AMD64_NUM_REGS); set_gdbarch_register_name (gdbarch, amd64_register_name); set_gdbarch_register_type (gdbarch, amd64_register_type); /* Register numbers of various important registers. */ set_gdbarch_sp_regnum (gdbarch, AMD64_RSP_REGNUM); /* %rsp */ set_gdbarch_pc_regnum (gdbarch, AMD64_RIP_REGNUM); /* %rip */ set_gdbarch_ps_regnum (gdbarch, AMD64_EFLAGS_REGNUM); /* %eflags */ set_gdbarch_fp0_regnum (gdbarch, AMD64_ST0_REGNUM); /* %st(0) */ /* The "default" register numbering scheme for AMD64 is referred to as the "DWARF Register Number Mapping" in the System V psABI. The preferred debugging format for all known AMD64 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, amd64_dwarf_reg_to_regnum); set_gdbarch_dwarf_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum); set_gdbarch_dwarf2_reg_to_regnum (gdbarch, amd64_dwarf_reg_to_regnum); /* We don't override SDB_REG_RO_REGNUM, since COFF doesn't seem to be in use on any of the supported AMD64 targets. */ /* Call dummy code. */ set_gdbarch_push_dummy_call (gdbarch, amd64_push_dummy_call); set_gdbarch_frame_align (gdbarch, amd64_frame_align); set_gdbarch_frame_red_zone_size (gdbarch, 128); set_gdbarch_convert_register_p (gdbarch, i387_convert_register_p); set_gdbarch_register_to_value (gdbarch, i387_register_to_value); set_gdbarch_value_to_register (gdbarch, i387_value_to_register); set_gdbarch_return_value (gdbarch, amd64_return_value); set_gdbarch_skip_prologue (gdbarch, amd64_skip_prologue); /* Avoid wiring in the MMX registers for now. */ set_gdbarch_num_pseudo_regs (gdbarch, 0); tdep->mm0_regnum = -1; set_gdbarch_unwind_dummy_id (gdbarch, amd64_unwind_dummy_id); frame_unwind_append_sniffer (gdbarch, amd64_sigtramp_frame_sniffer); frame_unwind_append_sniffer (gdbarch, amd64_frame_sniffer); frame_base_set_default (gdbarch, &amd64_frame_base); /* If we have a register mapping, enable the generic core file support. */ if (tdep->gregset_reg_offset) set_gdbarch_regset_from_core_section (gdbarch, amd64_regset_from_core_section); } #define I387_ST0_REGNUM AMD64_ST0_REGNUM /* The 64-bit FXSAVE format differs from the 32-bit format in the sense that the instruction pointer and data pointer are simply 64-bit offsets into the code segment and the data segment instead of a selector offset pair. The functions below store the upper 32 bits of these pointers (instead of just the 16-bits of the segment selector). */ /* Fill register REGNUM in REGCACHE with the appropriate floating-point or SSE register value from *FXSAVE. If REGNUM is -1, do this for all registers. This function masks off any of the reserved bits in *FXSAVE. */ void amd64_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave) { i387_supply_fxsave (regcache, regnum, fxsave); if (fxsave && gdbarch_ptr_bit (get_regcache_arch (regcache)) == 64) { const gdb_byte *regs = fxsave; if (regnum == -1 || regnum == I387_FISEG_REGNUM) regcache_raw_supply (regcache, I387_FISEG_REGNUM, regs + 12); if (regnum == -1 || regnum == I387_FOSEG_REGNUM) regcache_raw_supply (regcache, I387_FOSEG_REGNUM, regs + 20); } } /* Fill register REGNUM (if it is a floating-point or SSE register) in *FXSAVE with the value from REGCACHE. If REGNUM is -1, do this for all registers. This function doesn't touch any of the reserved bits in *FXSAVE. */ void amd64_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave) { gdb_byte *regs = fxsave; i387_collect_fxsave (regcache, regnum, fxsave); if (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 64) { if (regnum == -1 || regnum == I387_FISEG_REGNUM) regcache_raw_collect (regcache, I387_FISEG_REGNUM, regs + 12); if (regnum == -1 || regnum == I387_FOSEG_REGNUM) regcache_raw_collect (regcache, I387_FOSEG_REGNUM, regs + 20); } }
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