/* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
- Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
- Free Software Foundation, Inc.
+
+ Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+ 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ 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,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "doublest.h"
#include "arch-utils.h"
#include "osabi.h"
#include "block.h"
+#include "infcall.h"
#include "elf-bfd.h"
#include "alpha-tdep.h"
\f
+/* Return the name of the REGNO register.
+
+ An empty name corresponds to a register number that used to
+ be used for a virtual register. That virtual register has
+ been removed, but the index is still reserved to maintain
+ compatibility with existing remote alpha targets. */
+
static const char *
-alpha_register_name (int regno)
+alpha_register_name (struct gdbarch *gdbarch, int regno)
{
static const char * const register_names[] =
{
if (regno < 0)
return NULL;
- if (regno >= (sizeof(register_names) / sizeof(*register_names)))
+ if (regno >= ARRAY_SIZE(register_names))
return NULL;
return register_names[regno];
}
static int
-alpha_cannot_fetch_register (int regno)
+alpha_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
{
- return regno == ALPHA_ZERO_REGNUM;
+ return (regno == ALPHA_ZERO_REGNUM
+ || strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static int
-alpha_cannot_store_register (int regno)
+alpha_cannot_store_register (struct gdbarch *gdbarch, int regno)
{
- return regno == ALPHA_ZERO_REGNUM;
+ return (regno == ALPHA_ZERO_REGNUM
+ || strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static struct type *
/* Don't need to worry about little vs big endian until
some jerk tries to port to alpha-unicosmk. */
if (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31)
- return builtin_type_ieee_double_little;
+ return builtin_type_ieee_double;
return builtin_type_int64;
}
{
/* Filter out any registers eliminated, but whose regnum is
reserved for backward compatibility, e.g. the vfp. */
- if (REGISTER_NAME (regnum) == NULL || *REGISTER_NAME (regnum) == '\0')
+ if (gdbarch_register_name (gdbarch, regnum) == NULL
+ || *gdbarch_register_name (gdbarch, regnum) == '\0')
return 0;
if (group == all_reggroup)
return group == general_reggroup;
}
-static int
-alpha_register_byte (int regno)
-{
- return (regno * 8);
-}
-
-static int
-alpha_register_raw_size (int regno)
-{
- return 8;
-}
-
-static int
-alpha_register_virtual_size (int regno)
-{
- return 8;
-}
-
/* The following represents exactly the conversion performed by
the LDS instruction. This applies to both single-precision
floating point and 32-bit integers. */
/* Similarly, this represents exactly the conversion performed by
the STS instruction. */
-static inline void
+static void
alpha_sts (void *out, const void *in)
{
ULONGEST reg, mem;
registers is different. */
static int
-alpha_convert_register_p (int regno)
+alpha_convert_register_p (struct gdbarch *gdbarch, int regno, struct type *type)
{
- return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31);
+ return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31
+ && TYPE_LENGTH (type) != 8);
}
static void
-alpha_register_to_value (int regnum, struct type *valtype, char *in, char *out)
+alpha_register_to_value (struct frame_info *frame, int regnum,
+ struct type *valtype, gdb_byte *out)
{
+ gdb_byte in[MAX_REGISTER_SIZE];
+
+ frame_register_read (frame, regnum, in);
switch (TYPE_LENGTH (valtype))
{
case 4:
alpha_sts (out, in);
break;
- case 8:
- memcpy (out, in, 8);
- break;
default:
- error ("Cannot retrieve value from floating point register");
+ error (_("Cannot retrieve value from floating point register"));
}
}
static void
-alpha_value_to_register (struct type *valtype, int regnum, char *in, char *out)
+alpha_value_to_register (struct frame_info *frame, int regnum,
+ struct type *valtype, const gdb_byte *in)
{
+ gdb_byte out[MAX_REGISTER_SIZE];
+
switch (TYPE_LENGTH (valtype))
{
case 4:
alpha_lds (out, in);
break;
- case 8:
- memcpy (out, in, 8);
- break;
default:
- error ("Cannot store value in floating point register");
+ error (_("Cannot store value in floating point register"));
}
+ put_frame_register (frame, regnum, out);
}
\f
structure to be returned is passed as a hidden first argument. */
static CORE_ADDR
-alpha_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
+alpha_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)
int accumulate_size = struct_return ? 8 : 0;
struct alpha_arg
{
- char *contents;
+ gdb_byte *contents;
int len;
int offset;
};
struct alpha_arg *alpha_args
= (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
- register struct alpha_arg *m_arg;
- char arg_reg_buffer[ALPHA_REGISTER_SIZE * ALPHA_NUM_ARG_REGS];
+ struct alpha_arg *m_arg;
+ gdb_byte arg_reg_buffer[ALPHA_REGISTER_SIZE * ALPHA_NUM_ARG_REGS];
int required_arg_regs;
+ CORE_ADDR func_addr = find_function_addr (function, NULL);
/* The ABI places the address of the called function in T12. */
regcache_cooked_write_signed (regcache, ALPHA_T12_REGNUM, func_addr);
for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++)
{
struct value *arg = args[i];
- struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *arg_type = check_typedef (value_type (arg));
/* Cast argument to long if necessary as the compiler does it too. */
switch (TYPE_CODE (arg_type))
if (accumulate_size < sizeof (arg_reg_buffer)
&& TYPE_LENGTH (arg_type) == 4)
{
- arg_type = builtin_type_ieee_double_little;
+ arg_type = builtin_type_ieee_double;
arg = value_cast (arg_type, arg);
}
/* Tru64 5.1 has a 128-bit long double, and passes this by
sp = (sp & -16) - 16;
/* Write the real data into the stack. */
- write_memory (sp, VALUE_CONTENTS (arg), 16);
+ write_memory (sp, value_contents (arg), 16);
/* Construct the indirection. */
arg_type = lookup_pointer_type (arg_type);
sp = (sp & -16) - 16;
/* Write the real data into the stack. */
- write_memory (sp, VALUE_CONTENTS (arg), 32);
+ write_memory (sp, value_contents (arg), 32);
/* Construct the indirection. */
arg_type = lookup_pointer_type (arg_type);
m_arg->len = TYPE_LENGTH (arg_type);
m_arg->offset = accumulate_size;
accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
- m_arg->contents = VALUE_CONTENTS (arg);
+ m_arg->contents = value_contents_writeable (arg);
}
/* Determine required argument register loads, loading an argument register
/* `Push' arguments on the stack. */
for (i = nargs; m_arg--, --i >= 0;)
{
- char *contents = m_arg->contents;
+ gdb_byte *contents = m_arg->contents;
int offset = m_arg->offset;
int len = m_arg->len;
static void
alpha_extract_return_value (struct type *valtype, struct regcache *regcache,
- void *valbuf)
+ gdb_byte *valbuf)
{
int length = TYPE_LENGTH (valtype);
- char raw_buffer[ALPHA_REGISTER_SIZE];
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
ULONGEST l;
switch (TYPE_CODE (valtype))
break;
default:
- internal_error (__FILE__, __LINE__, "unknown floating point width");
+ internal_error (__FILE__, __LINE__, _("unknown floating point width"));
}
break;
case 16:
regcache_cooked_read (regcache, ALPHA_FP0_REGNUM, valbuf);
- regcache_cooked_read (regcache, ALPHA_FP0_REGNUM+1,
- (char *)valbuf + 8);
+ regcache_cooked_read (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8);
break;
case 32:
break;
default:
- internal_error (__FILE__, __LINE__, "unknown floating point width");
+ internal_error (__FILE__, __LINE__, _("unknown floating point width"));
}
break;
}
}
-/* Extract from REGCACHE the address of a structure about to be returned
- from a function. */
-
-static CORE_ADDR
-alpha_extract_struct_value_address (struct regcache *regcache)
-{
- ULONGEST addr;
- regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &addr);
- return addr;
-}
-
/* Insert the given value into REGCACHE as if it was being
returned by a function. */
static void
alpha_store_return_value (struct type *valtype, struct regcache *regcache,
- const void *valbuf)
+ const gdb_byte *valbuf)
{
int length = TYPE_LENGTH (valtype);
- char raw_buffer[ALPHA_REGISTER_SIZE];
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
ULONGEST l;
switch (TYPE_CODE (valtype))
/* FIXME: 128-bit long doubles are returned like structures:
by writing into indirect storage provided by the caller
as the first argument. */
- error ("Cannot set a 128-bit long double return value.");
+ error (_("Cannot set a 128-bit long double return value."));
default:
- internal_error (__FILE__, __LINE__, "unknown floating point width");
+ internal_error (__FILE__, __LINE__, _("unknown floating point width"));
}
break;
case 16:
regcache_cooked_write (regcache, ALPHA_FP0_REGNUM, valbuf);
- regcache_cooked_write (regcache, ALPHA_FP0_REGNUM+1,
- (const char *)valbuf + 8);
+ regcache_cooked_write (regcache, ALPHA_FP0_REGNUM + 1, valbuf + 8);
break;
case 32:
/* FIXME: 128-bit long doubles are returned like structures:
by writing into indirect storage provided by the caller
as the first argument. */
- error ("Cannot set a 128-bit long double return value.");
+ error (_("Cannot set a 128-bit long double return value."));
default:
- internal_error (__FILE__, __LINE__, "unknown floating point width");
+ internal_error (__FILE__, __LINE__, _("unknown floating point width"));
}
break;
}
}
+static enum return_value_convention
+alpha_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, gdb_byte *readbuf,
+ const gdb_byte *writebuf)
+{
+ enum type_code code = TYPE_CODE (type);
+
+ if ((code == TYPE_CODE_STRUCT
+ || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_ARRAY)
+ && gdbarch_tdep (gdbarch)->return_in_memory (type))
+ {
+ if (readbuf)
+ {
+ ULONGEST addr;
+ regcache_raw_read_unsigned (regcache, ALPHA_V0_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
+ }
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
+ }
+
+ if (readbuf)
+ alpha_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ alpha_store_return_value (type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+static int
+alpha_return_in_memory_always (struct type *type)
+{
+ return 1;
+}
\f
-static const unsigned char *
-alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+static const gdb_byte *
+alpha_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, int *len)
{
- static const unsigned char alpha_breakpoint[] =
- { 0x80, 0, 0, 0 }; /* call_pal bpt */
+ static const gdb_byte break_insn[] = { 0x80, 0, 0, 0 }; /* call_pal bpt */
- *lenptr = sizeof(alpha_breakpoint);
- return (alpha_breakpoint);
+ *len = sizeof(break_insn);
+ return break_insn;
}
\f
unsigned int
alpha_read_insn (CORE_ADDR pc)
{
- char buf[4];
+ gdb_byte buf[ALPHA_INSN_SIZE];
int status;
- status = read_memory_nobpt (pc, buf, 4);
+ status = read_memory_nobpt (pc, buf, sizeof (buf));
if (status)
memory_error (status, pc);
- return extract_unsigned_integer (buf, 4);
+ return extract_unsigned_integer (buf, sizeof (buf));
}
/* To skip prologues, I use this predicate. Returns either PC itself
unsigned long inst;
int offset;
CORE_ADDR post_prologue_pc;
- char buf[4];
+ gdb_byte buf[ALPHA_INSN_SIZE];
/* Silently return the unaltered pc upon memory errors.
This could happen on OSF/1 if decode_line_1 tries to skip the
Reading target memory is slow over serial lines, so we perform
this check only if the target has shared libraries (which all
Alpha targets do). */
- if (target_read_memory (pc, buf, 4))
+ if (target_read_memory (pc, buf, sizeof (buf)))
return pc;
/* See if we can determine the end of the prologue via the symbol table.
/* Skip the typical prologue instructions. These are the stack adjustment
instruction and the instructions that save registers on the stack
or in the gcc frame. */
- for (offset = 0; offset < 100; offset += 4)
+ for (offset = 0; offset < 100; offset += ALPHA_INSN_SIZE)
{
inst = alpha_read_insn (pc + offset);
into the "pc". This routine returns true on success. */
static int
-alpha_get_longjmp_target (CORE_ADDR *pc)
+alpha_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
CORE_ADDR jb_addr;
- char raw_buffer[ALPHA_REGISTER_SIZE];
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
- jb_addr = read_register (ALPHA_A0_REGNUM);
+ jb_addr = get_frame_register_unsigned (frame, ALPHA_A0_REGNUM);
if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size),
raw_buffer, tdep->jb_elt_size))
info = FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache);
*this_prologue_cache = info;
- tdep = gdbarch_tdep (current_gdbarch);
+ tdep = gdbarch_tdep (get_frame_arch (next_frame));
info->sigcontext_addr = tdep->sigcontext_addr (next_frame);
return info;
}
-/* Return the address of REGNO in a sigtramp frame. Since this is all
- arithmetic, it doesn't seem worthwhile to cache it. */
-
-#ifndef SIGFRAME_PC_OFF
-#define SIGFRAME_PC_OFF (2 * 8)
-#define SIGFRAME_REGSAVE_OFF (4 * 8)
-#define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
-#endif
+/* Return the address of REGNUM in a sigtramp frame. Since this is
+ all arithmetic, it doesn't seem worthwhile to cache it. */
static CORE_ADDR
-alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, unsigned int regno)
+alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr, int regnum)
{
- if (regno < 32)
- return sigcontext_addr + SIGFRAME_REGSAVE_OFF + regno * 8;
- if (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 32)
- return sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + regno * 8;
- if (regno == ALPHA_PC_REGNUM)
- return sigcontext_addr + SIGFRAME_PC_OFF;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ if (regnum >= 0 && regnum < 32)
+ return sigcontext_addr + tdep->sc_regs_offset + regnum * 8;
+ else if (regnum >= ALPHA_FP0_REGNUM && regnum < ALPHA_FP0_REGNUM + 32)
+ return sigcontext_addr + tdep->sc_fpregs_offset + regnum * 8;
+ else if (regnum == ALPHA_PC_REGNUM)
+ return sigcontext_addr + tdep->sc_pc_offset;
return 0;
}
/* If we have dynamic signal trampolines, find their start.
If we do not, then we must assume there is a symbol record
that can provide the start address. */
- tdep = gdbarch_tdep (current_gdbarch);
+ tdep = gdbarch_tdep (get_frame_arch (next_frame));
if (tdep->dynamic_sigtramp_offset)
{
int offset;
code_addr = 0;
}
else
- code_addr = frame_func_unwind (next_frame);
+ code_addr = frame_func_unwind (next_frame, SIGTRAMP_FRAME);
/* The stack address is trivially read from the sigcontext. */
stack_addr = alpha_sigtramp_register_address (info->sigcontext_addr,
void **this_prologue_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
+ int *realnump, gdb_byte *bufferp)
{
struct alpha_sigtramp_unwind_cache *info
= alpha_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
current description of it in alpha_sigtramp_frame_unwind_cache
doesn't include it. Too bad. Fall back on whatever's in the
outer frame. */
- frame_register (next_frame, regnum, optimizedp, lvalp, addrp,
- realnump, bufferp);
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realnump = regnum;
+ if (bufferp)
+ frame_unwind_register (next_frame, *realnump, bufferp);
}
static const struct frame_unwind alpha_sigtramp_frame_unwind = {
};
static const struct frame_unwind *
-alpha_sigtramp_frame_p (CORE_ADDR pc)
+alpha_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
char *name;
- /* We shouldn't even bother to try if the OSABI didn't register
- a sigcontext_addr handler. */
- if (!gdbarch_tdep (current_gdbarch)->sigcontext_addr)
+ /* NOTE: cagney/2004-04-30: Do not copy/clone this code. Instead
+ look at tramp-frame.h and other simplier per-architecture
+ sigtramp unwinders. */
+
+ /* We shouldn't even bother to try if the OSABI didn't register a
+ sigcontext_addr handler or pc_in_sigtramp hander. */
+ if (gdbarch_tdep (gdbarch)->sigcontext_addr == NULL)
+ return NULL;
+ if (gdbarch_tdep (gdbarch)->pc_in_sigtramp == NULL)
return NULL;
/* Otherwise we should be in a signal frame. */
find_pc_partial_function (pc, &name, NULL, NULL);
- if (PC_IN_SIGTRAMP (pc, name))
+ if (gdbarch_tdep (gdbarch)->pc_in_sigtramp (pc, name))
return &alpha_sigtramp_frame_unwind;
return NULL;
/* Search back for previous return; also stop at a 0, which might be
seen for instance before the start of a code section. Don't include
nops, since this usually indicates padding between functions. */
- for (pc -= 4; pc >= fence; pc -= 4)
+ for (pc -= ALPHA_INSN_SIZE; pc >= fence; pc -= ALPHA_INSN_SIZE)
{
unsigned int insn = alpha_read_insn (pc);
switch (insn)
static int blurb_printed = 0;
if (fence == tdep->vm_min_address)
- warning ("Hit beginning of text section without finding");
+ warning (_("Hit beginning of text section without finding \
+enclosing function for address 0x%s"), paddr_nz (orig_pc));
else
- warning ("Hit heuristic-fence-post without finding");
- warning ("enclosing function for address 0x%s", paddr_nz (orig_pc));
+ warning (_("Hit heuristic-fence-post without finding \
+enclosing function for address 0x%s"), paddr_nz (orig_pc));
if (!blurb_printed)
{
- printf_filtered ("\
+ printf_filtered (_("\
This warning occurs if you are debugging a function without any symbols\n\
(for example, in a stripped executable). In that case, you may wish to\n\
increase the size of the search with the `set heuristic-fence-post' command.\n\
\n\
Otherwise, you told GDB there was a function where there isn't one, or\n\
-(more likely) you have encountered a bug in GDB.\n");
+(more likely) you have encountered a bug in GDB.\n"));
blurb_printed = 1;
}
}
if (start_pc + 200 < limit_pc)
limit_pc = start_pc + 200;
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += ALPHA_INSN_SIZE)
{
unsigned int word = alpha_read_insn (cur_pc);
{
reg = (word & 0x03e00000) >> 21;
+ /* Ignore this instruction if we have already encountered
+ an instruction saving the same register earlier in the
+ function code. The current instruction does not tell
+ us where the original value upon function entry is saved.
+ All it says is that the function we are scanning reused
+ that register for some computation of its own, and is now
+ saving its result. */
+ if (info->saved_regs[reg])
+ continue;
+
if (reg == 31)
continue;
break;
}
- cur_pc += 4;
+ cur_pc += ALPHA_INSN_SIZE;
}
}
}
return_reg = ALPHA_RA_REGNUM;
info->return_reg = return_reg;
- frame_unwind_unsigned_register (next_frame, frame_reg, &val);
+ val = frame_unwind_register_unsigned (next_frame, frame_reg);
info->vfp = val + frame_size;
/* Convert offsets to absolute addresses. See above about adding
struct alpha_heuristic_unwind_cache *info
= alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
- /* This is meant to halt the backtrace at "_start". Make sure we
- don't halt it at a generic dummy frame. */
- if (inside_entry_file (info->start_pc))
- return;
-
*this_id = frame_id_build (info->vfp, info->start_pc);
}
void **this_prologue_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
+ int *realnump, gdb_byte *bufferp)
{
struct alpha_heuristic_unwind_cache *info
= alpha_heuristic_frame_unwind_cache (next_frame, this_prologue_cache, 0);
}
/* Otherwise assume the next frame has the same register value. */
- frame_register (next_frame, regnum, optimizedp, lvalp, addrp,
- realnump, bufferp);
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realnump = regnum;
+ if (bufferp)
+ frame_unwind_register (next_frame, *realnump, bufferp);
}
static const struct frame_unwind alpha_heuristic_frame_unwind = {
};
static const struct frame_unwind *
-alpha_heuristic_frame_p (CORE_ADDR pc)
+alpha_heuristic_frame_sniffer (struct frame_info *next_frame)
{
return &alpha_heuristic_frame_unwind;
}
}
\f
-/* ALPHA stack frames are almost impenetrable. When execution stops,
- we basically have to look at symbol information for the function
- that we stopped in, which tells us *which* register (if any) is
- the base of the frame pointer, and what offset from that register
- the frame itself is at.
-
- This presents a problem when trying to examine a stack in memory
- (that isn't executing at the moment), using the "frame" command. We
- don't have a PC, nor do we have any registers except SP.
-
- This routine takes two arguments, SP and PC, and tries to make the
- cached frames look as if these two arguments defined a frame on the
- cache. This allows the rest of info frame to extract the important
- arguments without difficulty. */
-
-struct frame_info *
-alpha_setup_arbitrary_frame (int argc, CORE_ADDR *argv)
-{
- if (argc != 2)
- error ("ALPHA frame specifications require two arguments: sp and pc");
-
- return create_new_frame (argv[0], argv[1]);
-}
-
/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
dummy frame. The frame ID's base needs to match the TOS value
saved by save_dummy_frame_tos(), and the PC match the dummy frame's
alpha_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
ULONGEST base;
- frame_unwind_unsigned_register (next_frame, ALPHA_SP_REGNUM, &base);
+ base = frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM);
return frame_id_build (base, frame_pc_unwind (next_frame));
}
alpha_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
ULONGEST pc;
- frame_unwind_unsigned_register (next_frame, ALPHA_PC_REGNUM, &pc);
+ pc = frame_unwind_register_unsigned (next_frame, ALPHA_PC_REGNUM);
return pc;
}
targets don't supply this value in their core files. */
void
-alpha_supply_int_regs (int regno, const void *r0_r30,
- const void *pc, const void *unique)
+alpha_supply_int_regs (struct regcache *regcache, int regno,
+ const void *r0_r30, const void *pc, const void *unique)
{
+ const gdb_byte *regs = r0_r30;
int i;
for (i = 0; i < 31; ++i)
if (regno == i || regno == -1)
- supply_register (i, (const char *)r0_r30 + i*8);
+ regcache_raw_supply (regcache, i, regs + i * 8);
if (regno == ALPHA_ZERO_REGNUM || regno == -1)
- supply_register (ALPHA_ZERO_REGNUM, NULL);
+ regcache_raw_supply (regcache, ALPHA_ZERO_REGNUM, NULL);
if (regno == ALPHA_PC_REGNUM || regno == -1)
- supply_register (ALPHA_PC_REGNUM, pc);
+ regcache_raw_supply (regcache, ALPHA_PC_REGNUM, pc);
if (regno == ALPHA_UNIQUE_REGNUM || regno == -1)
- supply_register (ALPHA_UNIQUE_REGNUM, unique);
+ regcache_raw_supply (regcache, ALPHA_UNIQUE_REGNUM, unique);
}
void
-alpha_fill_int_regs (int regno, void *r0_r30, void *pc, void *unique)
+alpha_fill_int_regs (const struct regcache *regcache,
+ int regno, void *r0_r30, void *pc, void *unique)
{
+ gdb_byte *regs = r0_r30;
int i;
for (i = 0; i < 31; ++i)
if (regno == i || regno == -1)
- regcache_collect (i, (char *)r0_r30 + i*8);
+ regcache_raw_collect (regcache, i, regs + i * 8);
if (regno == ALPHA_PC_REGNUM || regno == -1)
- regcache_collect (ALPHA_PC_REGNUM, pc);
+ regcache_raw_collect (regcache, ALPHA_PC_REGNUM, pc);
if (unique && (regno == ALPHA_UNIQUE_REGNUM || regno == -1))
- regcache_collect (ALPHA_UNIQUE_REGNUM, unique);
+ regcache_raw_collect (regcache, ALPHA_UNIQUE_REGNUM, unique);
}
void
-alpha_supply_fp_regs (int regno, const void *f0_f30, const void *fpcr)
+alpha_supply_fp_regs (struct regcache *regcache, int regno,
+ const void *f0_f30, const void *fpcr)
{
+ const gdb_byte *regs = f0_f30;
int i;
for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
if (regno == i || regno == -1)
- supply_register (i, (const char *)f0_f30 + (i - ALPHA_FP0_REGNUM) * 8);
+ regcache_raw_supply (regcache, i,
+ regs + (i - ALPHA_FP0_REGNUM) * 8);
if (regno == ALPHA_FPCR_REGNUM || regno == -1)
- supply_register (ALPHA_FPCR_REGNUM, fpcr);
+ regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, fpcr);
}
void
-alpha_fill_fp_regs (int regno, void *f0_f30, void *fpcr)
+alpha_fill_fp_regs (const struct regcache *regcache,
+ int regno, void *f0_f30, void *fpcr)
{
+ gdb_byte *regs = f0_f30;
int i;
for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
if (regno == i || regno == -1)
- regcache_collect (i, (char *)f0_f30 + (i - ALPHA_FP0_REGNUM) * 8);
+ regcache_raw_collect (regcache, i,
+ regs + (i - ALPHA_FP0_REGNUM) * 8);
if (regno == ALPHA_FPCR_REGNUM || regno == -1)
- regcache_collect (ALPHA_FPCR_REGNUM, fpcr);
+ regcache_raw_collect (regcache, ALPHA_FPCR_REGNUM, fpcr);
}
\f
+
+/* Return nonzero if the G_floating register value in REG is equal to
+ zero for FP control instructions. */
+
+static int
+fp_register_zero_p (LONGEST reg)
+{
+ /* Check that all bits except the sign bit are zero. */
+ const LONGEST zero_mask = ((LONGEST) 1 << 63) ^ -1;
+
+ return ((reg & zero_mask) == 0);
+}
+
+/* Return the value of the sign bit for the G_floating register
+ value held in REG. */
+
+static int
+fp_register_sign_bit (LONGEST reg)
+{
+ const LONGEST sign_mask = (LONGEST) 1 << 63;
+
+ return ((reg & sign_mask) != 0);
+}
+
/* alpha_software_single_step() is called just before we want to resume
the inferior, if we want to single-step it but there is no hardware
or kernel single-step support (NetBSD on Alpha, for example). We find
- the target of the coming instruction and breakpoint it.
-
- single_step is also called just after the inferior stops. If we had
- set up a simulated single-step, we undo our damage. */
+ the target of the coming instruction and breakpoint it. */
static CORE_ADDR
-alpha_next_pc (CORE_ADDR pc)
+alpha_next_pc (struct frame_info *frame, CORE_ADDR pc)
{
unsigned int insn;
unsigned int op;
+ int regno;
int offset;
LONGEST rav;
{
/* Jump format: target PC is:
RB & ~3 */
- return (read_register ((insn >> 16) & 0x1f) & ~3);
+ return (get_frame_register_unsigned (frame, (insn >> 16) & 0x1f) & ~3);
}
if ((op & 0x30) == 0x30)
offset = (insn & 0x001fffff);
if (offset & 0x00100000)
offset |= 0xffe00000;
- offset *= 4;
- return (pc + 4 + offset);
+ offset *= ALPHA_INSN_SIZE;
+ return (pc + ALPHA_INSN_SIZE + offset);
}
/* Need to determine if branch is taken; read RA. */
- rav = (LONGEST) read_register ((insn >> 21) & 0x1f);
+ regno = (insn >> 21) & 0x1f;
+ switch (op)
+ {
+ case 0x31: /* FBEQ */
+ case 0x36: /* FBGE */
+ case 0x37: /* FBGT */
+ case 0x33: /* FBLE */
+ case 0x32: /* FBLT */
+ case 0x35: /* FBNE */
+ regno += gdbarch_fp0_regnum (get_frame_arch (frame));
+ }
+
+ rav = get_frame_register_signed (frame, regno);
+
switch (op)
{
case 0x38: /* BLBC */
goto branch_taken;
break;
- /* ??? Missing floating-point branches. */
+ /* Floating point branches. */
+
+ case 0x31: /* FBEQ */
+ if (fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x36: /* FBGE */
+ if (fp_register_sign_bit (rav) == 0 || fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x37: /* FBGT */
+ if (fp_register_sign_bit (rav) == 0 && ! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x33: /* FBLE */
+ if (fp_register_sign_bit (rav) == 1 || fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x32: /* FBLT */
+ if (fp_register_sign_bit (rav) == 1 && ! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
+ case 0x35: /* FBNE */
+ if (! fp_register_zero_p (rav))
+ goto branch_taken;
+ break;
}
}
/* Not a branch or branch not taken; target PC is:
pc + 4 */
- return (pc + 4);
+ return (pc + ALPHA_INSN_SIZE);
}
-void
-alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p)
+int
+alpha_software_single_step (struct frame_info *frame)
{
- static CORE_ADDR next_pc;
- typedef char binsn_quantum[BREAKPOINT_MAX];
- static binsn_quantum break_mem;
- CORE_ADDR pc;
+ CORE_ADDR pc, next_pc;
- if (insert_breakpoints_p)
- {
- pc = read_pc ();
- next_pc = alpha_next_pc (pc);
+ pc = get_frame_pc (frame);
+ next_pc = alpha_next_pc (frame, pc);
- target_insert_breakpoint (next_pc, break_mem);
- }
- else
- {
- target_remove_breakpoint (next_pc, break_mem);
- write_pc (next_pc);
- }
+ insert_single_step_breakpoint (next_pc);
+ return 1;
}
\f
/* Lowest text address. This is used by heuristic_proc_start()
to decide when to stop looking. */
- tdep->vm_min_address = (CORE_ADDR) 0x120000000;
+ tdep->vm_min_address = (CORE_ADDR) 0x120000000LL;
tdep->dynamic_sigtramp_offset = NULL;
tdep->sigcontext_addr = NULL;
+ tdep->sc_pc_offset = 2 * 8;
+ tdep->sc_regs_offset = 4 * 8;
+ tdep->sc_fpregs_offset = tdep->sc_regs_offset + 32 * 8 + 8;
tdep->jb_pc = -1; /* longjmp support not enabled by default */
+ tdep->return_in_memory = alpha_return_in_memory_always;
+
/* Type sizes */
set_gdbarch_short_bit (gdbarch, 16);
set_gdbarch_int_bit (gdbarch, 32);
set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM);
set_gdbarch_register_name (gdbarch, alpha_register_name);
- set_gdbarch_deprecated_register_byte (gdbarch, alpha_register_byte);
- set_gdbarch_deprecated_register_raw_size (gdbarch, alpha_register_raw_size);
- set_gdbarch_deprecated_register_virtual_size (gdbarch, alpha_register_virtual_size);
set_gdbarch_register_type (gdbarch, alpha_register_type);
set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register);
set_gdbarch_print_insn (gdbarch, print_insn_alpha);
/* Call info. */
- set_gdbarch_frameless_function_invocation (gdbarch,
- generic_frameless_function_invocation_not);
- set_gdbarch_use_struct_convention (gdbarch, always_use_struct_convention);
- set_gdbarch_extract_return_value (gdbarch, alpha_extract_return_value);
- set_gdbarch_store_return_value (gdbarch, alpha_store_return_value);
- set_gdbarch_extract_struct_value_address (gdbarch,
- alpha_extract_struct_value_address);
+ set_gdbarch_return_value (gdbarch, alpha_return_value);
/* Settings for calling functions in the inferior. */
set_gdbarch_push_dummy_call (gdbarch, alpha_push_dummy_call);
/* Methods for saving / extracting a dummy frame's ID. */
set_gdbarch_unwind_dummy_id (gdbarch, alpha_unwind_dummy_id);
- set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
/* Return the unwound PC value. */
set_gdbarch_unwind_pc (gdbarch, alpha_unwind_pc);
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_gdbarch_breakpoint_from_pc (gdbarch, alpha_breakpoint_from_pc);
- set_gdbarch_decr_pc_after_break (gdbarch, 4);
-
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_frame_args_skip (gdbarch, 0);
+ set_gdbarch_decr_pc_after_break (gdbarch, ALPHA_INSN_SIZE);
+ set_gdbarch_cannot_step_breakpoint (gdbarch, 1);
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
if (tdep->jb_pc >= 0)
set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target);
- frame_unwind_append_predicate (gdbarch, alpha_sigtramp_frame_p);
- frame_unwind_append_predicate (gdbarch, alpha_heuristic_frame_p);
+ frame_unwind_append_sniffer (gdbarch, alpha_sigtramp_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, alpha_heuristic_frame_sniffer);
frame_base_set_default (gdbarch, &alpha_heuristic_frame_base);
void
alpha_dwarf2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- frame_unwind_append_predicate (gdbarch, dwarf2_frame_p);
- frame_base_append_predicate (gdbarch, dwarf2_frame_base_p);
- set_gdbarch_dwarf2_build_frame_info (gdbarch, dwarf2_build_frame_info);
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+ frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
}
extern initialize_file_ftype _initialize_alpha_tdep; /* -Wmissing-prototypes */
/* We really would like to have both "0" and "unlimited" work, but
command.c doesn't deal with that. So make it a var_zinteger
because the user can always use "999999" or some such for unlimited. */
- c = add_set_cmd ("heuristic-fence-post", class_support, var_zinteger,
- (char *) &heuristic_fence_post,
- "\
-Set the distance searched for the start of a function.\n\
-If you are debugging a stripped executable, GDB needs to search through the\n\
-program for the start of a function. This command sets the distance of the\n\
-search. The only need to set it is when debugging a stripped executable.",
- &setlist);
/* We need to throw away the frame cache when we set this, since it
might change our ability to get backtraces. */
- set_cmd_sfunc (c, reinit_frame_cache_sfunc);
- add_show_from_set (c, &showlist);
+ add_setshow_zinteger_cmd ("heuristic-fence-post", class_support,
+ &heuristic_fence_post, _("\
+Set the distance searched for the start of a function."), _("\
+Show the distance searched for the start of a function."), _("\
+If you are debugging a stripped executable, GDB needs to search through the\n\
+program for the start of a function. This command sets the distance of the\n\
+search. The only need to set it is when debugging a stripped executable."),
+ reinit_frame_cache_sfunc,
+ NULL, /* FIXME: i18n: The distance searched for the start of a function is \"%d\". */
+ &setlist, &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff