/* Intel 386 target-dependent stuff.
- Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
- 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 1988-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "dis-asm.h"
#include "disasm.h"
#include "remote.h"
-
+#include "exceptions.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "features/i386/i386-avx.c"
#include "features/i386/i386-mmx.c"
+#include "ax.h"
+#include "ax-gdb.h"
+
/* Register names. */
static const char *i386_register_names[] =
its legitimate values. */
static const char att_flavor[] = "att";
static const char intel_flavor[] = "intel";
-static const char *valid_flavors[] =
+static const char *const valid_flavors[] =
{
att_flavor,
intel_flavor,
static int
i386_syscall_p (const gdb_byte *insn, int *lengthp)
{
- if (insn[0] == 0xcd)
+ /* Is it 'int $0x80'? */
+ if ((insn[0] == 0xcd && insn[1] == 0x80)
+ /* Or is it 'sysenter'? */
+ || (insn[0] == 0x0f && insn[1] == 0x34)
+ /* Or is it 'syscall'? */
+ || (insn[0] == 0x0f && insn[1] == 0x05))
{
*lengthp = 2;
return 1;
/* Adjust the destination offset. */
rel32 = extract_signed_integer (insn + 1, 4, byte_order);
newrel = (oldloc - *to) + rel32;
- store_signed_integer (insn + 1, 4, newrel, byte_order);
+ store_signed_integer (insn + 1, 4, byte_order, newrel);
+
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "Adjusted insn rel32=%s at %s to"
+ " rel32=%s at %s\n",
+ hex_string (rel32), paddress (gdbarch, oldloc),
+ hex_string (newrel), paddress (gdbarch, *to));
/* Write the adjusted jump into its displaced location. */
append_insns (to, 5, insn);
{
rel32 = extract_signed_integer (insn + offset, 4, byte_order);
newrel = (oldloc - *to) + rel32;
- store_signed_integer (insn + offset, 4, newrel, byte_order);
+ store_signed_integer (insn + offset, 4, byte_order, newrel);
if (debug_displaced)
fprintf_unfiltered (gdb_stdlog,
- "Adjusted insn rel32=0x%s at 0x%s to"
- " rel32=0x%s at 0x%s\n",
+ "Adjusted insn rel32=%s at %s to"
+ " rel32=%s at %s\n",
hex_string (rel32), paddress (gdbarch, oldloc),
hex_string (newrel), paddress (gdbarch, *to));
}
{
/* Base address. */
CORE_ADDR base;
+ int base_p;
LONGEST sp_offset;
CORE_ADDR pc;
cache = FRAME_OBSTACK_ZALLOC (struct i386_frame_cache);
/* Base address. */
+ cache->base_p = 0;
cache->base = 0;
cache->sp_offset = -4;
cache->pc = 0;
long delta = 0;
int data16 = 0;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
+
if (op == 0x66)
{
data16 = 1;
if (current_pc <= pc)
return pc;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op != 0x58) /* popl %eax */
return pc;
- target_read_memory (pc + 1, buf, 4);
+ if (target_read_memory (pc + 1, buf, 4))
+ return pc;
+
if (memcmp (buf, proto1, 3) != 0 && memcmp (buf, proto2, 4) != 0)
return pc;
gdb_byte buf[8];
gdb_byte op;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op == 0x68 || op == 0x6a)
{
gdb_byte mask[I386_MAX_MATCHED_INSN_LEN];
};
-/* Search for the instruction at PC in the list SKIP_INSNS. Return
+/* Return whether instruction at PC matches PATTERN. */
+
+static int
+i386_match_pattern (CORE_ADDR pc, struct i386_insn pattern)
+{
+ gdb_byte op;
+
+ if (target_read_memory (pc, &op, 1))
+ return 0;
+
+ if ((op & pattern.mask[0]) == pattern.insn[0])
+ {
+ gdb_byte buf[I386_MAX_MATCHED_INSN_LEN - 1];
+ int insn_matched = 1;
+ size_t i;
+
+ gdb_assert (pattern.len > 1);
+ gdb_assert (pattern.len <= I386_MAX_MATCHED_INSN_LEN);
+
+ if (target_read_memory (pc + 1, buf, pattern.len - 1))
+ return 0;
+
+ for (i = 1; i < pattern.len; i++)
+ {
+ if ((buf[i - 1] & pattern.mask[i]) != pattern.insn[i])
+ insn_matched = 0;
+ }
+ return insn_matched;
+ }
+ return 0;
+}
+
+/* Search for the instruction at PC in the list INSN_PATTERNS. Return
the first instruction description that matches. Otherwise, return
NULL. */
static struct i386_insn *
-i386_match_insn (CORE_ADDR pc, struct i386_insn *skip_insns)
+i386_match_insn (CORE_ADDR pc, struct i386_insn *insn_patterns)
{
- struct i386_insn *insn;
+ struct i386_insn *pattern;
+
+ for (pattern = insn_patterns; pattern->len > 0; pattern++)
+ {
+ if (i386_match_pattern (pc, *pattern))
+ return pattern;
+ }
+
+ return NULL;
+}
+
+/* Return whether PC points inside a sequence of instructions that
+ matches INSN_PATTERNS. */
+
+static int
+i386_match_insn_block (CORE_ADDR pc, struct i386_insn *insn_patterns)
+{
+ CORE_ADDR current_pc;
+ int ix, i;
gdb_byte op;
+ struct i386_insn *insn;
- target_read_memory (pc, &op, 1);
+ insn = i386_match_insn (pc, insn_patterns);
+ if (insn == NULL)
+ return 0;
- for (insn = skip_insns; insn->len > 0; insn++)
+ current_pc = pc;
+ ix = insn - insn_patterns;
+ for (i = ix - 1; i >= 0; i--)
{
- if ((op & insn->mask[0]) == insn->insn[0])
- {
- gdb_byte buf[I386_MAX_MATCHED_INSN_LEN - 1];
- int insn_matched = 1;
- size_t i;
+ current_pc -= insn_patterns[i].len;
- gdb_assert (insn->len > 1);
- gdb_assert (insn->len <= I386_MAX_MATCHED_INSN_LEN);
+ if (!i386_match_pattern (current_pc, insn_patterns[i]))
+ return 0;
+ }
- target_read_memory (pc + 1, buf, insn->len - 1);
- for (i = 1; i < insn->len; i++)
- {
- if ((buf[i - 1] & insn->mask[i]) != insn->insn[i])
- insn_matched = 0;
- }
+ current_pc = pc + insn->len;
+ for (insn = insn_patterns + ix + 1; insn->len > 0; insn++)
+ {
+ if (!i386_match_pattern (current_pc, *insn))
+ return 0;
- if (insn_matched)
- return insn;
- }
+ current_pc += insn->len;
}
- return NULL;
+ return 1;
}
/* Some special instructions that might be migrated by GCC into the
gdb_byte op;
int check = 1;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
while (check)
{
if (op == 0x90)
{
pc += 1;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
check = 1;
}
/* Ignore no-op instruction `mov %edi, %edi'.
else if (op == 0x8b)
{
- target_read_memory (pc + 1, &op, 1);
+ if (target_read_memory (pc + 1, &op, 1))
+ return pc;
+
if (op == 0xff)
{
pc += 2;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
+
check = 1;
}
}
if (limit <= pc)
return limit;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op == 0x55) /* pushl %ebp */
{
if (limit <= pc + skip)
return limit;
- target_read_memory (pc + skip, &op, 1);
+ if (target_read_memory (pc + skip, &op, 1))
+ return pc + skip;
/* Check for `movl %esp, %ebp' -- can be written in two ways. */
switch (op)
NOTE: You can't subtract a 16-bit immediate from a 32-bit
reg, so we don't have to worry about a data16 prefix. */
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op == 0x83)
{
/* `subl' with 8-bit immediate. */
offset -= cache->locals;
for (i = 0; i < 8 && pc < current_pc; i++)
{
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op < 0x50 || op > 0x57)
break;
for (i = 0; i < 6; i++)
{
- target_read_memory (pc + i, &op, 1);
+ if (target_read_memory (pc + i, &op, 1))
+ return pc;
+
if (pic_pat[i] != op)
break;
}
{
int delta = 6;
- target_read_memory (pc + delta, &op, 1);
+ if (target_read_memory (pc + delta, &op, 1))
+ return pc;
if (op == 0x89) /* movl %ebx, x(%ebp) */
{
else /* Unexpected instruction. */
delta = 0;
- target_read_memory (pc + delta, &op, 1);
+ if (target_read_memory (pc + delta, &op, 1))
+ return pc;
}
/* addl y,%ebx */
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte op;
- target_read_memory (pc, &op, 1);
+ if (target_read_memory (pc, &op, 1))
+ return pc;
if (op == 0xe8)
{
gdb_byte buf[4];
/* Normal frames. */
-static struct i386_frame_cache *
-i386_frame_cache (struct frame_info *this_frame, void **this_cache)
+static void
+i386_frame_cache_1 (struct frame_info *this_frame,
+ struct i386_frame_cache *cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct i386_frame_cache *cache;
gdb_byte buf[4];
int i;
- if (*this_cache)
- return *this_cache;
-
- cache = i386_alloc_frame_cache ();
- *this_cache = cache;
+ cache->pc = get_frame_func (this_frame);
/* In principle, for normal frames, %ebp holds the frame pointer,
which holds the base address for the current stack frame.
get_frame_register (this_frame, I386_EBP_REGNUM, buf);
cache->base = extract_unsigned_integer (buf, 4, byte_order);
if (cache->base == 0)
- return cache;
+ {
+ cache->base_p = 1;
+ return;
+ }
/* For normal frames, %eip is stored at 4(%ebp). */
cache->saved_regs[I386_EIP_REGNUM] = 4;
- cache->pc = get_frame_func (this_frame);
if (cache->pc != 0)
i386_analyze_prologue (gdbarch, cache->pc, get_frame_pc (this_frame),
cache);
- if (cache->saved_sp_reg != -1)
- {
- /* Saved stack pointer has been saved. */
- get_frame_register (this_frame, cache->saved_sp_reg, buf);
- cache->saved_sp = extract_unsigned_integer (buf, 4, byte_order);
- }
-
if (cache->locals < 0)
{
/* We didn't find a valid frame, which means that CACHE->base
if (cache->saved_sp_reg != -1)
{
+ /* Saved stack pointer has been saved. */
+ get_frame_register (this_frame, cache->saved_sp_reg, buf);
+ cache->saved_sp = extract_unsigned_integer (buf, 4, byte_order);
+
/* We're halfway aligning the stack. */
cache->base = ((cache->saved_sp - 4) & 0xfffffff0) - 4;
cache->saved_regs[I386_EIP_REGNUM] = cache->saved_sp - 4;
cache->saved_regs[I386_EBP_REGNUM] = 0;
}
+ if (cache->saved_sp_reg != -1)
+ {
+ /* Saved stack pointer has been saved (but the SAVED_SP_REG
+ register may be unavailable). */
+ if (cache->saved_sp == 0
+ && frame_register_read (this_frame, cache->saved_sp_reg, buf))
+ cache->saved_sp = extract_unsigned_integer (buf, 4, byte_order);
+ }
/* Now that we have the base address for the stack frame we can
calculate the value of %esp in the calling frame. */
- if (cache->saved_sp == 0)
+ else if (cache->saved_sp == 0)
cache->saved_sp = cache->base + 8;
/* Adjust all the saved registers such that they contain addresses
if (cache->saved_regs[i] != -1)
cache->saved_regs[i] += cache->base;
+ cache->base_p = 1;
+}
+
+static struct i386_frame_cache *
+i386_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ volatile struct gdb_exception ex;
+ struct i386_frame_cache *cache;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = i386_alloc_frame_cache ();
+ *this_cache = cache;
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ i386_frame_cache_1 (this_frame, cache);
+ }
+ if (ex.reason < 0 && ex.error != NOT_AVAILABLE_ERROR)
+ throw_exception (ex);
+
return cache;
}
(*this_id) = frame_id_build (cache->base + 8, cache->pc);
}
+static enum unwind_stop_reason
+i386_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct i386_frame_cache *cache = i386_frame_cache (this_frame, this_cache);
+
+ if (!cache->base_p)
+ return UNWIND_UNAVAILABLE;
+
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return UNWIND_OUTERMOST;
+
+ return UNWIND_NO_REASON;
+}
+
static struct value *
i386_frame_prev_register (struct frame_info *this_frame, void **this_cache,
int regnum)
if (regnum == I386_EIP_REGNUM && cache->pc_in_eax)
return frame_unwind_got_register (this_frame, regnum, I386_EAX_REGNUM);
- if (regnum == I386_ESP_REGNUM && cache->saved_sp)
- return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp);
+ if (regnum == I386_ESP_REGNUM
+ && (cache->saved_sp != 0 || cache->saved_sp_reg != -1))
+ {
+ /* If the SP has been saved, but we don't know where, then this
+ means that SAVED_SP_REG register was found unavailable back
+ when we built the cache. */
+ if (cache->saved_sp == 0)
+ return frame_unwind_got_register (this_frame, regnum,
+ cache->saved_sp_reg);
+ else
+ return frame_unwind_got_constant (this_frame, regnum,
+ cache->saved_sp);
+ }
if (regnum < I386_NUM_SAVED_REGS && cache->saved_regs[regnum] != -1)
return frame_unwind_got_memory (this_frame, regnum,
static const struct frame_unwind i386_frame_unwind =
{
NORMAL_FRAME,
+ i386_frame_unwind_stop_reason,
i386_frame_this_id,
i386_frame_prev_register,
NULL,
i386_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
gdb_byte insn;
+ struct symtab *symtab;
+
+ symtab = find_pc_symtab (pc);
+ if (symtab && symtab->epilogue_unwind_valid)
+ return 0;
if (target_read_memory (pc, &insn, 1))
return 0; /* Can't read memory at pc. */
static struct i386_frame_cache *
i386_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache)
{
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ volatile struct gdb_exception ex;
struct i386_frame_cache *cache;
- gdb_byte buf[4];
+ CORE_ADDR sp;
if (*this_cache)
return *this_cache;
cache = i386_alloc_frame_cache ();
*this_cache = cache;
- /* Cache base will be %esp plus cache->sp_offset (-4). */
- get_frame_register (this_frame, I386_ESP_REGNUM, buf);
- cache->base = extract_unsigned_integer (buf, 4,
- byte_order) + cache->sp_offset;
-
- /* Cache pc will be the frame func. */
- cache->pc = get_frame_pc (this_frame);
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ cache->pc = get_frame_func (this_frame);
- /* The saved %esp will be at cache->base plus 8. */
- cache->saved_sp = cache->base + 8;
+ /* At this point the stack looks as if we just entered the
+ function, with the return address at the top of the
+ stack. */
+ sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
+ cache->base = sp + cache->sp_offset;
+ cache->saved_sp = cache->base + 8;
+ cache->saved_regs[I386_EIP_REGNUM] = cache->base + 4;
- /* The saved %eip will be at cache->base plus 4. */
- cache->saved_regs[I386_EIP_REGNUM] = cache->base + 4;
+ cache->base_p = 1;
+ }
+ if (ex.reason < 0 && ex.error != NOT_AVAILABLE_ERROR)
+ throw_exception (ex);
return cache;
}
+static enum unwind_stop_reason
+i386_epilogue_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct i386_frame_cache *cache =
+ i386_epilogue_frame_cache (this_frame, this_cache);
+
+ if (!cache->base_p)
+ return UNWIND_UNAVAILABLE;
+
+ return UNWIND_NO_REASON;
+}
+
static void
i386_epilogue_frame_this_id (struct frame_info *this_frame,
void **this_cache,
struct frame_id *this_id)
{
- struct i386_frame_cache *cache = i386_epilogue_frame_cache (this_frame,
- this_cache);
+ struct i386_frame_cache *cache =
+ i386_epilogue_frame_cache (this_frame, this_cache);
+
+ if (!cache->base_p)
+ return;
(*this_id) = frame_id_build (cache->base + 8, cache->pc);
}
+static struct value *
+i386_epilogue_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ /* Make sure we've initialized the cache. */
+ i386_epilogue_frame_cache (this_frame, this_cache);
+
+ return i386_frame_prev_register (this_frame, this_cache, regnum);
+}
+
static const struct frame_unwind i386_epilogue_frame_unwind =
{
NORMAL_FRAME,
+ i386_epilogue_frame_unwind_stop_reason,
i386_epilogue_frame_this_id,
- i386_frame_prev_register,
+ i386_epilogue_frame_prev_register,
NULL,
i386_epilogue_frame_sniffer
};
\f
+/* Stack-based trampolines. */
+
+/* These trampolines are used on cross x86 targets, when taking the
+ address of a nested function. When executing these trampolines,
+ no stack frame is set up, so we are in a similar situation as in
+ epilogues and i386_epilogue_frame_this_id can be re-used. */
+
+/* Static chain passed in register. */
+
+struct i386_insn i386_tramp_chain_in_reg_insns[] =
+{
+ /* `movl imm32, %eax' and `movl imm32, %ecx' */
+ { 5, { 0xb8 }, { 0xfe } },
+
+ /* `jmp imm32' */
+ { 5, { 0xe9 }, { 0xff } },
+
+ {0}
+};
+
+/* Static chain passed on stack (when regparm=3). */
+
+struct i386_insn i386_tramp_chain_on_stack_insns[] =
+{
+ /* `push imm32' */
+ { 5, { 0x68 }, { 0xff } },
+
+ /* `jmp imm32' */
+ { 5, { 0xe9 }, { 0xff } },
+
+ {0}
+};
+
+/* Return whether PC points inside a stack trampoline. */
+
+static int
+i386_in_stack_tramp_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ gdb_byte insn;
+ const char *name;
+
+ /* A stack trampoline is detected if no name is associated
+ to the current pc and if it points inside a trampoline
+ sequence. */
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (name)
+ return 0;
+
+ if (target_read_memory (pc, &insn, 1))
+ return 0;
+
+ if (!i386_match_insn_block (pc, i386_tramp_chain_in_reg_insns)
+ && !i386_match_insn_block (pc, i386_tramp_chain_on_stack_insns))
+ return 0;
+
+ return 1;
+}
+
+static int
+i386_stack_tramp_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_cache)
+{
+ if (frame_relative_level (this_frame) == 0)
+ return i386_in_stack_tramp_p (get_frame_arch (this_frame),
+ get_frame_pc (this_frame));
+ else
+ return 0;
+}
+
+static const struct frame_unwind i386_stack_tramp_frame_unwind =
+{
+ NORMAL_FRAME,
+ i386_epilogue_frame_unwind_stop_reason,
+ i386_epilogue_frame_this_id,
+ i386_epilogue_frame_prev_register,
+ NULL,
+ i386_stack_tramp_frame_sniffer
+};
+\f
+/* Generate a bytecode expression to get the value of the saved PC. */
+
+static void
+i386_gen_return_address (struct gdbarch *gdbarch,
+ struct agent_expr *ax, struct axs_value *value,
+ CORE_ADDR scope)
+{
+ /* The following sequence assumes the traditional use of the base
+ register. */
+ ax_reg (ax, I386_EBP_REGNUM);
+ ax_const_l (ax, 4);
+ ax_simple (ax, aop_add);
+ value->type = register_type (gdbarch, I386_EIP_REGNUM);
+ value->kind = axs_lvalue_memory;
+}
+\f
+
/* Signal trampolines. */
static struct i386_frame_cache *
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ volatile struct gdb_exception ex;
struct i386_frame_cache *cache;
CORE_ADDR addr;
gdb_byte buf[4];
cache = i386_alloc_frame_cache ();
- get_frame_register (this_frame, I386_ESP_REGNUM, buf);
- cache->base = extract_unsigned_integer (buf, 4, byte_order) - 4;
-
- addr = tdep->sigcontext_addr (this_frame);
- if (tdep->sc_reg_offset)
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
{
- int i;
+ get_frame_register (this_frame, I386_ESP_REGNUM, buf);
+ cache->base = extract_unsigned_integer (buf, 4, byte_order) - 4;
- gdb_assert (tdep->sc_num_regs <= I386_NUM_SAVED_REGS);
+ addr = tdep->sigcontext_addr (this_frame);
+ if (tdep->sc_reg_offset)
+ {
+ int i;
- 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];
- }
- else
- {
- cache->saved_regs[I386_EIP_REGNUM] = addr + tdep->sc_pc_offset;
- cache->saved_regs[I386_ESP_REGNUM] = addr + tdep->sc_sp_offset;
+ gdb_assert (tdep->sc_num_regs <= I386_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];
+ }
+ else
+ {
+ cache->saved_regs[I386_EIP_REGNUM] = addr + tdep->sc_pc_offset;
+ cache->saved_regs[I386_ESP_REGNUM] = addr + tdep->sc_sp_offset;
+ }
+
+ cache->base_p = 1;
}
+ if (ex.reason < 0 && ex.error != NOT_AVAILABLE_ERROR)
+ throw_exception (ex);
*this_cache = cache;
return cache;
}
+static enum unwind_stop_reason
+i386_sigtramp_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct i386_frame_cache *cache =
+ i386_sigtramp_frame_cache (this_frame, this_cache);
+
+ if (!cache->base_p)
+ return UNWIND_UNAVAILABLE;
+
+ return UNWIND_NO_REASON;
+}
+
static void
i386_sigtramp_frame_this_id (struct frame_info *this_frame, void **this_cache,
struct frame_id *this_id)
struct i386_frame_cache *cache =
i386_sigtramp_frame_cache (this_frame, this_cache);
+ if (!cache->base_p)
+ return;
+
/* See the end of i386_push_dummy_call. */
(*this_id) = frame_id_build (cache->base + 8, get_frame_pc (this_frame));
}
static const struct frame_unwind i386_sigtramp_frame_unwind =
{
SIGTRAMP_FRAME,
+ i386_sigtramp_frame_unwind_stop_reason,
i386_sigtramp_frame_this_id,
i386_sigtramp_frame_prev_register,
NULL,
/* See the end of i386_push_dummy_call. */
return frame_id_build (fp + 8, get_frame_pc (this_frame));
}
+
+/* _Decimal128 function return values need 16-byte alignment on the
+ stack. */
+
+static CORE_ADDR
+i386_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+ return sp & -(CORE_ADDR)16;
+}
\f
/* Figure out where the longjmp will land. Slurp the args out of the
static const char default_struct_convention[] = "default";
static const char pcc_struct_convention[] = "pcc";
static const char reg_struct_convention[] = "reg";
-static const char *valid_conventions[] =
+static const char *const valid_conventions[] =
{
default_struct_convention,
pcc_struct_convention,
return (I387_ST0_REGNUM (tdep) + fpreg);
}
+/* A helper function for us by i386_pseudo_register_read_value and
+ amd64_pseudo_register_read_value. It does all the work but reads
+ the data into an already-allocated value. */
+
void
-i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
- int regnum, gdb_byte *buf)
+i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ int regnum,
+ struct value *result_value)
{
gdb_byte raw_buf[MAX_REGISTER_SIZE];
+ enum register_status status;
+ gdb_byte *buf = value_contents_raw (result_value);
if (i386_mmx_regnum_p (gdbarch, regnum))
{
int fpnum = i386_mmx_regnum_to_fp_regnum (regcache, regnum);
/* Extract (always little endian). */
- regcache_raw_read (regcache, fpnum, raw_buf);
- memcpy (buf, raw_buf, register_size (gdbarch, regnum));
+ status = regcache_raw_read (regcache, fpnum, raw_buf);
+ if (status != REG_VALID)
+ mark_value_bytes_unavailable (result_value, 0,
+ TYPE_LENGTH (value_type (result_value)));
+ else
+ memcpy (buf, raw_buf, register_size (gdbarch, regnum));
}
else
{
regnum -= tdep->ymm0_regnum;
/* Extract (always little endian). Read lower 128bits. */
- regcache_raw_read (regcache,
- I387_XMM0_REGNUM (tdep) + regnum,
- raw_buf);
- memcpy (buf, raw_buf, 16);
+ status = regcache_raw_read (regcache,
+ I387_XMM0_REGNUM (tdep) + regnum,
+ raw_buf);
+ if (status != REG_VALID)
+ mark_value_bytes_unavailable (result_value, 0, 16);
+ else
+ memcpy (buf, raw_buf, 16);
/* Read upper 128bits. */
- regcache_raw_read (regcache,
- tdep->ymm0h_regnum + regnum,
- raw_buf);
- memcpy (buf + 16, raw_buf, 16);
+ status = regcache_raw_read (regcache,
+ tdep->ymm0h_regnum + regnum,
+ raw_buf);
+ if (status != REG_VALID)
+ mark_value_bytes_unavailable (result_value, 16, 32);
+ else
+ memcpy (buf + 16, raw_buf, 16);
}
else if (i386_word_regnum_p (gdbarch, regnum))
{
int gpnum = regnum - tdep->ax_regnum;
/* Extract (always little endian). */
- regcache_raw_read (regcache, gpnum, raw_buf);
- memcpy (buf, raw_buf, 2);
+ status = regcache_raw_read (regcache, gpnum, raw_buf);
+ if (status != REG_VALID)
+ mark_value_bytes_unavailable (result_value, 0,
+ TYPE_LENGTH (value_type (result_value)));
+ else
+ memcpy (buf, raw_buf, 2);
}
else if (i386_byte_regnum_p (gdbarch, regnum))
{
/* Extract (always little endian). We read both lower and
upper registers. */
- regcache_raw_read (regcache, gpnum % 4, raw_buf);
- if (gpnum >= 4)
+ status = regcache_raw_read (regcache, gpnum % 4, raw_buf);
+ if (status != REG_VALID)
+ mark_value_bytes_unavailable (result_value, 0,
+ TYPE_LENGTH (value_type (result_value)));
+ else if (gpnum >= 4)
memcpy (buf, raw_buf + 1, 1);
else
memcpy (buf, raw_buf, 1);
}
}
+static struct value *
+i386_pseudo_register_read_value (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ int regnum)
+{
+ struct value *result;
+
+ result = allocate_value (register_type (gdbarch, regnum));
+ VALUE_LVAL (result) = lval_register;
+ VALUE_REGNUM (result) = regnum;
+
+ i386_pseudo_register_read_into_value (gdbarch, regcache, regnum, result);
+
+ return result;
+}
+
void
i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, const gdb_byte *buf)
/* Read a value of type TYPE from register REGNUM in frame FRAME, and
return its contents in TO. */
-static void
+static int
i386_register_to_value (struct frame_info *frame, int regnum,
- struct type *type, gdb_byte *to)
+ struct type *type, gdb_byte *to,
+ int *optimizedp, int *unavailablep)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
int len = TYPE_LENGTH (type);
- /* FIXME: kettenis/20030609: What should we do if REGNUM isn't
- available in FRAME (i.e. if it wasn't saved)? */
-
if (i386_fp_regnum_p (gdbarch, regnum))
- {
- i387_register_to_value (frame, regnum, type, to);
- return;
- }
+ return i387_register_to_value (frame, regnum, type, to,
+ optimizedp, unavailablep);
/* Read a value spread across multiple registers. */
gdb_assert (regnum != -1);
gdb_assert (register_size (gdbarch, regnum) == 4);
- get_frame_register (frame, regnum, to);
+ if (!get_frame_register_bytes (frame, regnum, 0,
+ register_size (gdbarch, regnum),
+ to, optimizedp, unavailablep))
+ return 0;
+
regnum = i386_next_regnum (regnum);
len -= 4;
to += 4;
}
+
+ *optimizedp = *unavailablep = 0;
+ return 1;
}
/* Write the contents FROM of a value of type TYPE into register
read_memory_unsigned_integer (pc + 2, 4, byte_order);
struct minimal_symbol *indsym =
indirect ? lookup_minimal_symbol_by_pc (indirect) : 0;
- char *symname = indsym ? SYMBOL_LINKAGE_NAME (indsym) : 0;
+ const char *symname = indsym ? SYMBOL_LINKAGE_NAME (indsym) : 0;
if (symname)
{
i386_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
- char *name;
+ const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
return (name && strcmp ("_sigtramp", name) == 0);
i386_svr4_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
- char *name;
+ const char *name;
/* UnixWare uses _sigacthandler. The origin of the other symbols is
currently unknown. */
};
/* Check that the given address appears suitable for a fast
- tracepoint, which on x86 means that we need an instruction of at
+ tracepoint, which on x86-64 means that we need an instruction of at
least 5 bytes, so that we can overwrite it with a 4-byte-offset
jump and not have to worry about program jumps to an address in the
- middle of the tracepoint jump. Returns 1 if OK, and writes a size
+ middle of the tracepoint jump. On x86, it may be possible to use
+ 4-byte jumps with a 2-byte offset to a trampoline located in the
+ bottom 64 KiB of memory. Returns 1 if OK, and writes a size
of instruction to replace, and 0 if not, plus an explanatory
string. */
int len, jumplen;
static struct ui_file *gdb_null = NULL;
- /* This is based on the target agent using a 4-byte relative jump.
- Alternate future possibilities include 8-byte offset for x86-84,
- or 3-byte jumps if the program has trampoline space close by. */
- jumplen = 5;
+ /* Ask the target for the minimum instruction length supported. */
+ jumplen = target_get_min_fast_tracepoint_insn_len ();
+
+ if (jumplen < 0)
+ {
+ /* If the target does not support the get_min_fast_tracepoint_insn_len
+ operation, assume that fast tracepoints will always be implemented
+ using 4-byte relative jumps on both x86 and x86-64. */
+ jumplen = 5;
+ }
+ else if (jumplen == 0)
+ {
+ /* If the target does support get_min_fast_tracepoint_insn_len but
+ returns zero, then the IPA has not loaded yet. In this case,
+ we optimistically assume that truncated 2-byte relative jumps
+ will be available on x86, and compensate later if this assumption
+ turns out to be incorrect. On x86-64 architectures, 4-byte relative
+ jumps will always be used. */
+ jumplen = (register_size (gdbarch, 0) == 8) ? 5 : 4;
+ }
/* Dummy file descriptor for the disassembler. */
if (!gdb_null)
/* Check for fit. */
len = gdb_print_insn (gdbarch, addr, gdb_null, NULL);
+ if (isize)
+ *isize = len;
+
if (len < jumplen)
{
/* Return a bit of target-specific detail to add to the caller's
len, jumplen);
return 0;
}
-
- if (isize)
- *isize = len;
- if (msg)
- *msg = NULL;
- return 1;
+ else
+ {
+ if (msg)
+ *msg = NULL;
+ return 1;
+ }
}
static int
tdep->record_regmap = i386_record_regmap;
+ set_gdbarch_long_long_align_bit (gdbarch, 32);
+
/* The format used for `long double' on almost all i386 targets is
the i387 extended floating-point format. In fact, of all targets
in the GCC 2.95 tree, only OSF/1 does it different, and insists
/* Call dummy code. */
set_gdbarch_push_dummy_call (gdbarch, i386_push_dummy_call);
+ set_gdbarch_frame_align (gdbarch, i386_frame_align);
set_gdbarch_convert_register_p (gdbarch, i386_convert_register_p);
set_gdbarch_register_to_value (gdbarch, i386_register_to_value);
set_gdbarch_fetch_pointer_argument (gdbarch, i386_fetch_pointer_argument);
/* Hook the function epilogue frame unwinder. This unwinder is
- appended to the list first, so that it supercedes the Dwarf
- unwinder in function epilogues (where the Dwarf unwinder
+ appended to the list first, so that it supercedes the DWARF
+ unwinder in function epilogues (where the DWARF unwinder
currently fails). */
frame_unwind_append_unwinder (gdbarch, &i386_epilogue_frame_unwind);
/* Hook in the DWARF CFI frame unwinder. This unwinder is appended
- to the list before the prologue-based unwinders, so that Dwarf
+ to the list before the prologue-based unwinders, so that DWARF
CFI info will be used if it is available. */
dwarf2_append_unwinders (gdbarch);
frame_base_set_default (gdbarch, &i386_frame_base);
/* Pseudo registers may be changed by amd64_init_abi. */
- set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read);
+ set_gdbarch_pseudo_register_read_value (gdbarch,
+ i386_pseudo_register_read_value);
set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write);
set_tdesc_pseudo_register_type (gdbarch, i386_pseudo_register_type);
set_gdbarch_relocate_instruction (gdbarch, i386_relocate_instruction);
+ set_gdbarch_gen_return_address (gdbarch, i386_gen_return_address);
+
/* Hook in ABI-specific overrides, if they have been registered. */
info.tdep_info = (void *) tdesc_data;
gdbarch_init_osabi (info, gdbarch);
tdep->mm0_regnum = -1;
/* Hook in the legacy prologue-based unwinders last (fallback). */
+ frame_unwind_append_unwinder (gdbarch, &i386_stack_tramp_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &i386_sigtramp_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &i386_frame_unwind);
projects / deliverable / binutils-gdb.git / blobdiff