/* 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) 1993-2019 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 "frame.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "dwarf2-frame.h"
#include "inferior.h"
#include "symtab.h"
#include "value.h"
#include "dis-asm.h"
#include "symfile.h"
#include "objfiles.h"
-#include "gdb_string.h"
#include "linespec.h"
#include "regcache.h"
-#include "doublest.h"
+#include "reggroups.h"
#include "arch-utils.h"
#include "osabi.h"
#include "block.h"
+#include "infcall.h"
+#include "trad-frame.h"
#include "elf-bfd.h"
#include "alpha-tdep.h"
+#include <algorithm>
-static gdbarch_init_ftype alpha_gdbarch_init;
-
-static gdbarch_register_name_ftype alpha_register_name;
-static gdbarch_register_raw_size_ftype alpha_register_raw_size;
-static gdbarch_register_virtual_size_ftype alpha_register_virtual_size;
-static gdbarch_register_virtual_type_ftype alpha_register_virtual_type;
-static gdbarch_register_byte_ftype alpha_register_byte;
-static gdbarch_cannot_fetch_register_ftype alpha_cannot_fetch_register;
-static gdbarch_cannot_store_register_ftype alpha_cannot_store_register;
-static gdbarch_register_convertible_ftype alpha_register_convertible;
-static gdbarch_register_convert_to_virtual_ftype
- alpha_register_convert_to_virtual;
-static gdbarch_register_convert_to_raw_ftype alpha_register_convert_to_raw;
-static gdbarch_store_struct_return_ftype alpha_store_struct_return;
-static gdbarch_deprecated_extract_return_value_ftype alpha_extract_return_value;
-static gdbarch_deprecated_extract_struct_value_address_ftype
- alpha_extract_struct_value_address;
-static gdbarch_use_struct_convention_ftype alpha_use_struct_convention;
-
-static gdbarch_breakpoint_from_pc_ftype alpha_breakpoint_from_pc;
-
-static gdbarch_frame_args_address_ftype alpha_frame_args_address;
-static gdbarch_frame_locals_address_ftype alpha_frame_locals_address;
-
-static gdbarch_skip_prologue_ftype alpha_skip_prologue;
-static gdbarch_saved_pc_after_call_ftype alpha_saved_pc_after_call;
-static gdbarch_frame_chain_ftype alpha_frame_chain;
-static gdbarch_frame_saved_pc_ftype alpha_frame_saved_pc;
-static gdbarch_frame_init_saved_regs_ftype alpha_frame_init_saved_regs;
-
-static gdbarch_push_arguments_ftype alpha_push_arguments;
-static gdbarch_pop_frame_ftype alpha_pop_frame;
-static gdbarch_fix_call_dummy_ftype alpha_fix_call_dummy;
-
-static gdbarch_get_longjmp_target_ftype alpha_get_longjmp_target;
-
-struct frame_extra_info
- {
- alpha_extra_func_info_t proc_desc;
- int localoff;
- int pc_reg;
- };
-
-/* FIXME: Some of this code should perhaps be merged with mips-tdep.c. */
-
-/* Prototypes for local functions. */
-
-static void alpha_find_saved_regs (struct frame_info *);
-
-static alpha_extra_func_info_t push_sigtramp_desc (CORE_ADDR low_addr);
+/* Instruction decoding. The notations for registers, immediates and
+ opcodes are the same as the one used in Compaq's Alpha architecture
+ handbook. */
-static CORE_ADDR read_next_frame_reg (struct frame_info *, int);
+#define INSN_OPCODE(insn) ((insn & 0xfc000000) >> 26)
-static CORE_ADDR heuristic_proc_start (CORE_ADDR);
+/* Memory instruction format */
+#define MEM_RA(insn) ((insn & 0x03e00000) >> 21)
+#define MEM_RB(insn) ((insn & 0x001f0000) >> 16)
+#define MEM_DISP(insn) \
+ (((insn & 0x8000) == 0) ? (insn & 0xffff) : -((-insn) & 0xffff))
-static alpha_extra_func_info_t heuristic_proc_desc (CORE_ADDR,
- CORE_ADDR,
- struct frame_info *);
+static const int lda_opcode = 0x08;
+static const int stq_opcode = 0x2d;
-static alpha_extra_func_info_t find_proc_desc (CORE_ADDR,
- struct frame_info *);
+/* Branch instruction format */
+#define BR_RA(insn) MEM_RA(insn)
-#if 0
-static int alpha_in_lenient_prologue (CORE_ADDR, CORE_ADDR);
-#endif
+static const int br_opcode = 0x30;
+static const int bne_opcode = 0x3d;
-static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *);
+/* Operate instruction format */
+#define OPR_FUNCTION(insn) ((insn & 0xfe0) >> 5)
+#define OPR_HAS_IMMEDIATE(insn) ((insn & 0x1000) == 0x1000)
+#define OPR_RA(insn) MEM_RA(insn)
+#define OPR_RC(insn) ((insn & 0x1f))
+#define OPR_LIT(insn) ((insn & 0x1fe000) >> 13)
-static CORE_ADDR after_prologue (CORE_ADDR pc,
- alpha_extra_func_info_t proc_desc);
+static const int subq_opcode = 0x10;
+static const int subq_function = 0x29;
-static int alpha_in_prologue (CORE_ADDR pc,
- alpha_extra_func_info_t proc_desc);
-
-static int alpha_about_to_return (CORE_ADDR pc);
-
-void _initialize_alpha_tdep (void);
-
-/* Heuristic_proc_start may hunt through the text section for a long
- time across a 2400 baud serial line. Allows the user to limit this
- search. */
-static unsigned int heuristic_fence_post = 0;
-/* *INDENT-OFF* */
-/* Layout of a stack frame on the alpha:
-
- | |
- pdr members: | 7th ... nth arg, |
- | `pushed' by caller. |
- | |
-----------------|-------------------------------|<-- old_sp == vfp
- ^ ^ ^ ^ | |
- | | | | | |
- | |localoff | Copies of 1st .. 6th |
- | | | | | argument if necessary. |
- | | | v | |
- | | | --- |-------------------------------|<-- FRAME_LOCALS_ADDRESS
- | | | | |
- | | | | Locals and temporaries. |
- | | | | |
- | | | |-------------------------------|
- | | | | |
- |-fregoffset | Saved float registers. |
- | | | | F9 |
- | | | | . |
- | | | | . |
- | | | | F2 |
- | | v | |
- | | -------|-------------------------------|
- | | | |
- | | | Saved registers. |
- | | | S6 |
- |-regoffset | . |
- | | | . |
- | | | S0 |
- | | | pdr.pcreg |
- | v | |
- | ----------|-------------------------------|
- | | |
- frameoffset | Argument build area, gets |
- | | 7th ... nth arg for any |
- | | called procedure. |
- v | |
- -------------|-------------------------------|<-- sp
- | |
-*/
-/* *INDENT-ON* */
-
-#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
-/* These next two fields are kind of being hijacked. I wonder if
- iline is too small for the values it needs to hold, if GDB is
- running on a 32-bit host. */
-#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
-#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */
-#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
-#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
-#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
-#define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
-#define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
-#define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
-#define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
-#define PROC_LOCALOFF(proc) ((proc)->pdr.localoff)
-#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
-#define _PROC_MAGIC_ 0x0F0F0F0F
-#define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
-#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
-
-struct linked_proc_info
- {
- struct alpha_extra_func_info info;
- struct linked_proc_info *next;
- }
- *linked_proc_desc_table = NULL;
\f
-static CORE_ADDR
-alpha_frame_past_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- if (tdep->skip_sigtramp_frame != NULL)
- return (tdep->skip_sigtramp_frame (frame, pc));
-
- return (0);
-}
-
-static LONGEST
-alpha_dynamic_sigtramp_offset (CORE_ADDR pc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- /* Must be provided by OS/ABI variant code if supported. */
- if (tdep->dynamic_sigtramp_offset != NULL)
- return (tdep->dynamic_sigtramp_offset (pc));
-
- return (-1);
-}
-
-#define ALPHA_PROC_SIGTRAMP_MAGIC 0x0e0f0f0f
-
-/* Return TRUE if the procedure descriptor PROC is a procedure
- descriptor that refers to a dynamically generated signal
- trampoline routine. */
-static int
-alpha_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+/* Return the name of the REGNO register.
- if (tdep->dynamic_sigtramp_offset != NULL)
- return (proc->pdr.isym == ALPHA_PROC_SIGTRAMP_MAGIC);
-
- return (0);
-}
-
-static void
-alpha_set_proc_desc_is_dyn_sigtramp (struct alpha_extra_func_info *proc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- if (tdep->dynamic_sigtramp_offset != NULL)
- proc->pdr.isym = ALPHA_PROC_SIGTRAMP_MAGIC;
-}
-
-/* Dynamically create a signal-handler caller procedure descriptor for
- the signal-handler return code starting at address LOW_ADDR. The
- descriptor is added to the linked_proc_desc_table. */
-
-static alpha_extra_func_info_t
-push_sigtramp_desc (CORE_ADDR low_addr)
-{
- struct linked_proc_info *link;
- alpha_extra_func_info_t proc_desc;
-
- link = (struct linked_proc_info *)
- xmalloc (sizeof (struct linked_proc_info));
- link->next = linked_proc_desc_table;
- linked_proc_desc_table = link;
-
- proc_desc = &link->info;
-
- proc_desc->numargs = 0;
- PROC_LOW_ADDR (proc_desc) = low_addr;
- PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4;
- PROC_DUMMY_FRAME (proc_desc) = 0;
- PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */
- PROC_FRAME_REG (proc_desc) = SP_REGNUM;
- PROC_REG_MASK (proc_desc) = 0xffff;
- PROC_FREG_MASK (proc_desc) = 0xffff;
- PROC_PC_REG (proc_desc) = 26;
- PROC_LOCALOFF (proc_desc) = 0;
- alpha_set_proc_desc_is_dyn_sigtramp (proc_desc);
- return (proc_desc);
-}
-\f
+ 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 char *register_names[] =
+ static const char * const register_names[] =
{
"v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",
"t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr",
- "pc", "vfp", "unique",
+ "pc", "", "unique"
};
if (regno < 0)
- return (NULL);
- if (regno >= (sizeof(register_names) / sizeof(*register_names)))
- return (NULL);
- return (register_names[regno]);
-}
-
-static int
-alpha_cannot_fetch_register (int regno)
-{
- return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM);
+ return NULL;
+ if (regno >= ARRAY_SIZE(register_names))
+ return NULL;
+ return register_names[regno];
}
static int
-alpha_cannot_store_register (int regno)
+alpha_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
{
- return (regno == FP_REGNUM || regno == ALPHA_ZERO_REGNUM);
+ return (strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static int
-alpha_register_convertible (int regno)
+alpha_cannot_store_register (struct gdbarch *gdbarch, int regno)
{
- return (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31);
+ return (regno == ALPHA_ZERO_REGNUM
+ || strlen (alpha_register_name (gdbarch, regno)) == 0);
}
static struct type *
-alpha_register_virtual_type (int regno)
+alpha_register_type (struct gdbarch *gdbarch, int regno)
{
- return ((regno >= FP0_REGNUM && regno < (FP0_REGNUM+31))
- ? builtin_type_double : builtin_type_long);
-}
+ if (regno == ALPHA_SP_REGNUM || regno == ALPHA_GP_REGNUM)
+ return builtin_type (gdbarch)->builtin_data_ptr;
+ if (regno == ALPHA_PC_REGNUM)
+ return builtin_type (gdbarch)->builtin_func_ptr;
-static int
-alpha_register_byte (int regno)
-{
- return (regno * 8);
-}
+ /* 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 (gdbarch)->builtin_double;
-static int
-alpha_register_raw_size (int regno)
-{
- return 8;
+ return builtin_type (gdbarch)->builtin_int64;
}
+/* Is REGNUM a member of REGGROUP? */
+
static int
-alpha_register_virtual_size (int regno)
+alpha_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
{
- return 8;
-}
-\f
+ /* Filter out any registers eliminated, but whose regnum is
+ reserved for backward compatibility, e.g. the vfp. */
+ if (gdbarch_register_name (gdbarch, regnum) == NULL
+ || *gdbarch_register_name (gdbarch, regnum) == '\0')
+ return 0;
-static CORE_ADDR
-alpha_sigcontext_addr (struct frame_info *fi)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ if (group == all_reggroup)
+ return 1;
+
+ /* Zero should not be saved or restored. Technically it is a general
+ register (just as $f31 would be a float if we represented it), but
+ there's no point displaying it during "info regs", so leave it out
+ of all groups except for "all". */
+ if (regnum == ALPHA_ZERO_REGNUM)
+ return 0;
+
+ /* All other registers are saved and restored. */
+ if (group == save_reggroup || group == restore_reggroup)
+ return 1;
- if (tdep->sigcontext_addr)
- return (tdep->sigcontext_addr (fi));
+ /* All other groups are non-overlapping. */
- return (0);
+ /* Since this is really a PALcode memory slot... */
+ if (regnum == ALPHA_UNIQUE_REGNUM)
+ return group == system_reggroup;
+
+ /* Force the FPCR to be considered part of the floating point state. */
+ if (regnum == ALPHA_FPCR_REGNUM)
+ return group == float_reggroup;
+
+ if (regnum >= ALPHA_FP0_REGNUM && regnum < ALPHA_FP0_REGNUM + 31)
+ return group == float_reggroup;
+ else
+ return group == general_reggroup;
}
-/* Guaranteed to set frame->saved_regs to some values (it never leaves it
- NULL). */
+/* The following represents exactly the conversion performed by
+ the LDS instruction. This applies to both single-precision
+ floating point and 32-bit integers. */
static void
-alpha_find_saved_regs (struct frame_info *frame)
+alpha_lds (struct gdbarch *gdbarch, void *out, const void *in)
{
- int ireg;
- CORE_ADDR reg_position;
- unsigned long mask;
- alpha_extra_func_info_t proc_desc;
- int returnreg;
-
- frame_saved_regs_zalloc (frame);
-
- /* If it is the frame for __sigtramp, the saved registers are located
- in a sigcontext structure somewhere on the stack. __sigtramp
- passes a pointer to the sigcontext structure on the stack.
- If the stack layout for __sigtramp changes, or if sigcontext offsets
- change, we might have to update this code. */
-#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
- if ((get_frame_type (frame) == SIGTRAMP_FRAME))
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ ULONGEST mem
+ = extract_unsigned_integer ((const gdb_byte *) in, 4, byte_order);
+ ULONGEST frac = (mem >> 0) & 0x7fffff;
+ ULONGEST sign = (mem >> 31) & 1;
+ ULONGEST exp_msb = (mem >> 30) & 1;
+ ULONGEST exp_low = (mem >> 23) & 0x7f;
+ ULONGEST exp, reg;
+
+ exp = (exp_msb << 10) | exp_low;
+ if (exp_msb)
{
- CORE_ADDR sigcontext_addr;
-
- sigcontext_addr = alpha_sigcontext_addr (frame);
- if (sigcontext_addr == 0)
- {
- /* Don't know where the sigcontext is; just bail. */
- return;
- }
- for (ireg = 0; ireg < 32; ireg++)
- {
- reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8;
- get_frame_saved_regs (frame)[ireg] = reg_position;
- }
- for (ireg = 0; ireg < 32; ireg++)
- {
- reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8;
- get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position;
- }
- get_frame_saved_regs (frame)[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF;
- return;
+ if (exp_low == 0x7f)
+ exp = 0x7ff;
}
-
- proc_desc = get_frame_extra_info (frame)->proc_desc;
- if (proc_desc == NULL)
- /* I'm not sure how/whether this can happen. Normally when we can't
- find a proc_desc, we "synthesize" one using heuristic_proc_desc
- and set the saved_regs right away. */
- return;
-
- /* Fill in the offsets for the registers which gen_mask says
- were saved. */
-
- reg_position = get_frame_base (frame) + PROC_REG_OFFSET (proc_desc);
- mask = PROC_REG_MASK (proc_desc);
-
- returnreg = PROC_PC_REG (proc_desc);
-
- /* Note that RA is always saved first, regardless of its actual
- register number. */
- if (mask & (1 << returnreg))
+ else
{
- get_frame_saved_regs (frame)[returnreg] = reg_position;
- reg_position += 8;
- mask &= ~(1 << returnreg); /* Clear bit for RA so we
- don't save again later. */
+ if (exp_low != 0x00)
+ exp |= 0x380;
}
- for (ireg = 0; ireg <= 31; ++ireg)
- if (mask & (1 << ireg))
- {
- get_frame_saved_regs (frame)[ireg] = reg_position;
- reg_position += 8;
- }
-
- /* Fill in the offsets for the registers which float_mask says
- were saved. */
-
- reg_position = get_frame_base (frame) + PROC_FREG_OFFSET (proc_desc);
- mask = PROC_FREG_MASK (proc_desc);
-
- for (ireg = 0; ireg <= 31; ++ireg)
- if (mask & (1 << ireg))
- {
- get_frame_saved_regs (frame)[FP0_REGNUM + ireg] = reg_position;
- reg_position += 8;
- }
-
- get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_saved_regs (frame)[returnreg];
+ reg = (sign << 63) | (exp << 52) | (frac << 29);
+ store_unsigned_integer ((gdb_byte *) out, 8, byte_order, reg);
}
+/* Similarly, this represents exactly the conversion performed by
+ the STS instruction. */
+
static void
-alpha_frame_init_saved_regs (struct frame_info *fi)
+alpha_sts (struct gdbarch *gdbarch, void *out, const void *in)
{
- if (get_frame_saved_regs (fi) == NULL)
- alpha_find_saved_regs (fi);
- get_frame_saved_regs (fi)[SP_REGNUM] = get_frame_base (fi);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ ULONGEST reg, mem;
+
+ reg = extract_unsigned_integer ((const gdb_byte *) in, 8, byte_order);
+ mem = ((reg >> 32) & 0xc0000000) | ((reg >> 29) & 0x3fffffff);
+ store_unsigned_integer ((gdb_byte *) out, 4, byte_order, mem);
}
-static CORE_ADDR
-alpha_init_frame_pc_first (int fromleaf, struct frame_info *prev)
+/* The alpha needs a conversion between register and memory format if the
+ register is a floating point register and memory format is float, as the
+ register format must be double or memory format is an integer with 4
+ bytes, as the representation of integers in floating point
+ registers is different. */
+
+static int
+alpha_convert_register_p (struct gdbarch *gdbarch, int regno,
+ struct type *type)
{
- return (fromleaf ? SAVED_PC_AFTER_CALL (get_next_frame (prev))
- : get_next_frame (prev) ? FRAME_SAVED_PC (get_next_frame (prev))
- : read_pc ());
+ return (regno >= ALPHA_FP0_REGNUM && regno < ALPHA_FP0_REGNUM + 31
+ && TYPE_LENGTH (type) == 4);
}
-static CORE_ADDR
-read_next_frame_reg (struct frame_info *fi, int regno)
+static int
+alpha_register_to_value (struct frame_info *frame, int regnum,
+ struct type *valtype, gdb_byte *out,
+ int *optimizedp, int *unavailablep)
{
- for (; fi; fi = get_next_frame (fi))
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct value *value = get_frame_register_value (frame, regnum);
+
+ gdb_assert (value != NULL);
+ *optimizedp = value_optimized_out (value);
+ *unavailablep = !value_entirely_available (value);
+
+ if (*optimizedp || *unavailablep)
{
- /* We have to get the saved sp from the sigcontext
- if it is a signal handler frame. */
- if (regno == SP_REGNUM && !(get_frame_type (fi) == SIGTRAMP_FRAME))
- return get_frame_base (fi);
- else
- {
- if (get_frame_saved_regs (fi) == NULL)
- alpha_find_saved_regs (fi);
- if (get_frame_saved_regs (fi)[regno])
- return read_memory_integer (get_frame_saved_regs (fi)[regno], 8);
- }
+ release_value (value);
+ return 0;
}
- return read_register (regno);
-}
-static CORE_ADDR
-alpha_frame_saved_pc (struct frame_info *frame)
-{
- alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc;
- /* We have to get the saved pc from the sigcontext
- if it is a signal handler frame. */
- int pcreg = ((get_frame_type (frame) == SIGTRAMP_FRAME)
- ? PC_REGNUM
- : get_frame_extra_info (frame)->pc_reg);
+ /* Convert to VALTYPE. */
- if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc))
- return read_memory_integer (get_frame_base (frame) - 8, 8);
+ gdb_assert (TYPE_LENGTH (valtype) == 4);
+ alpha_sts (gdbarch, out, value_contents_all (value));
- return read_next_frame_reg (frame, pcreg);
+ release_value (value);
+ return 1;
}
-static CORE_ADDR
-alpha_saved_pc_after_call (struct frame_info *frame)
+static void
+alpha_value_to_register (struct frame_info *frame, int regnum,
+ struct type *valtype, const gdb_byte *in)
{
- CORE_ADDR pc = get_frame_pc (frame);
- CORE_ADDR tmp;
- alpha_extra_func_info_t proc_desc;
- int pcreg;
+ gdb_byte out[ALPHA_REGISTER_SIZE];
- /* Skip over shared library trampoline if necessary. */
- tmp = SKIP_TRAMPOLINE_CODE (pc);
- if (tmp != 0)
- pc = tmp;
+ gdb_assert (TYPE_LENGTH (valtype) == 4);
+ gdb_assert (register_size (get_frame_arch (frame), regnum)
+ <= ALPHA_REGISTER_SIZE);
+ alpha_lds (get_frame_arch (frame), out, in);
- proc_desc = find_proc_desc (pc, get_next_frame (frame));
- pcreg = proc_desc ? PROC_PC_REG (proc_desc) : ALPHA_RA_REGNUM;
-
- if ((get_frame_type (frame) == SIGTRAMP_FRAME))
- return alpha_frame_saved_pc (frame);
- else
- return read_register (pcreg);
+ put_frame_register (frame, regnum, out);
}
+\f
+/* The alpha passes the first six arguments in the registers, the rest on
+ the stack. The register arguments are stored in ARG_REG_BUFFER, and
+ then moved into the register file; this simplifies the passing of a
+ large struct which extends from the registers to the stack, plus avoids
+ three ptrace invocations per word.
-static struct alpha_extra_func_info temp_proc_desc;
-static CORE_ADDR temp_saved_regs[ALPHA_NUM_REGS];
+ We don't bother tracking which register values should go in integer
+ regs or fp regs; we load the same values into both.
-/* Nonzero if instruction at PC is a return instruction. "ret
- $zero,($ra),1" on alpha. */
+ If the called function is returning a structure, the address of the
+ structure to be returned is passed as a hidden first argument. */
-static int
-alpha_about_to_return (CORE_ADDR pc)
+static CORE_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,
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
- return read_memory_integer (pc, 4) == 0x6bfa8001;
-}
-
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ int i;
+ int accumulate_size = (return_method == return_method_struct) ? 8 : 0;
+ struct alpha_arg
+ {
+ const gdb_byte *contents;
+ int len;
+ int offset;
+ };
+ struct alpha_arg *alpha_args = XALLOCAVEC (struct alpha_arg, nargs);
+ 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);
-/* This fencepost looks highly suspicious to me. Removing it also
- seems suspicious as it could affect remote debugging across serial
- lines. */
+ /* Set the return address register to point to the entry point
+ of the program, where a breakpoint lies in wait. */
+ regcache_cooked_write_signed (regcache, ALPHA_RA_REGNUM, bp_addr);
-static CORE_ADDR
-heuristic_proc_start (CORE_ADDR pc)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- CORE_ADDR start_pc = pc;
- CORE_ADDR fence = start_pc - heuristic_fence_post;
+ /* Lay out the arguments in memory. */
+ 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));
- if (start_pc == 0)
- return 0;
+ /* Cast argument to long if necessary as the compiler does it too. */
+ switch (TYPE_CODE (arg_type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_ENUM:
+ if (TYPE_LENGTH (arg_type) == 4)
+ {
+ /* 32-bit values must be sign-extended to 64 bits
+ even if the base data type is unsigned. */
+ arg_type = builtin_type (gdbarch)->builtin_int32;
+ arg = value_cast (arg_type, arg);
+ }
+ if (TYPE_LENGTH (arg_type) < ALPHA_REGISTER_SIZE)
+ {
+ arg_type = builtin_type (gdbarch)->builtin_int64;
+ arg = value_cast (arg_type, arg);
+ }
+ break;
- if (heuristic_fence_post == UINT_MAX
- || fence < tdep->vm_min_address)
- fence = tdep->vm_min_address;
+ case TYPE_CODE_FLT:
+ /* "float" arguments loaded in registers must be passed in
+ register format, aka "double". */
+ if (accumulate_size < sizeof (arg_reg_buffer)
+ && TYPE_LENGTH (arg_type) == 4)
+ {
+ arg_type = builtin_type (gdbarch)->builtin_double;
+ arg = value_cast (arg_type, arg);
+ }
+ /* Tru64 5.1 has a 128-bit long double, and passes this by
+ invisible reference. No one else uses this data type. */
+ else if (TYPE_LENGTH (arg_type) == 16)
+ {
+ /* Allocate aligned storage. */
+ sp = (sp & -16) - 16;
- /* search back for previous return */
- for (start_pc -= 4;; start_pc -= 4)
- if (start_pc < fence)
- {
- /* It's not clear to me why we reach this point when
- stop_soon_quietly, but with this test, at least we
- don't print out warnings for every child forked (eg, on
- decstation). 22apr93 rich@cygnus.com. */
- if (!stop_soon_quietly)
- {
- static int blurb_printed = 0;
-
- if (fence == tdep->vm_min_address)
- warning ("Hit beginning of text section without finding");
- else
- warning ("Hit heuristic-fence-post without finding");
-
- warning ("enclosing function for address 0x%s", paddr_nz (pc));
- if (!blurb_printed)
- {
- 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");
- blurb_printed = 1;
- }
- }
-
- return 0;
- }
- else if (alpha_about_to_return (start_pc))
- break;
+ /* Write the real data into the stack. */
+ write_memory (sp, value_contents (arg), 16);
- start_pc += 4; /* skip return */
- return start_pc;
-}
+ /* Construct the indirection. */
+ arg_type = lookup_pointer_type (arg_type);
+ arg = value_from_pointer (arg_type, sp);
+ }
+ break;
-static alpha_extra_func_info_t
-heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
- struct frame_info *next_frame)
-{
- CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
- CORE_ADDR vfp = sp;
- CORE_ADDR cur_pc;
- int frame_size;
- int has_frame_reg = 0;
- unsigned long reg_mask = 0;
- int pcreg = -1;
- int regno;
+ case TYPE_CODE_COMPLEX:
+ /* ??? The ABI says that complex values are passed as two
+ separate scalar values. This distinction only matters
+ for complex float. However, GCC does not implement this. */
- if (start_pc == 0)
- return NULL;
- memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
- memset (&temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS);
- PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
+ /* Tru64 5.1 has a 128-bit long double, and passes this by
+ invisible reference. */
+ if (TYPE_LENGTH (arg_type) == 32)
+ {
+ /* Allocate aligned storage. */
+ sp = (sp & -16) - 16;
- if (start_pc + 200 < limit_pc)
- limit_pc = start_pc + 200;
- frame_size = 0;
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
- {
- char buf[4];
- unsigned long word;
- int status;
+ /* Write the real data into the stack. */
+ write_memory (sp, value_contents (arg), 32);
- status = read_memory_nobpt (cur_pc, buf, 4);
- if (status)
- memory_error (status, cur_pc);
- word = extract_unsigned_integer (buf, 4);
+ /* Construct the indirection. */
+ arg_type = lookup_pointer_type (arg_type);
+ arg = value_from_pointer (arg_type, sp);
+ }
+ break;
- if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- {
- if (word & 0x8000)
- {
- /* Consider only the first stack allocation instruction
- to contain the static size of the frame. */
- if (frame_size == 0)
- frame_size += (-word) & 0xffff;
- }
- else
- /* Exit loop if a positive stack adjustment is found, which
- usually means that the stack cleanup code in the function
- epilogue is reached. */
- break;
- }
- else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
- && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
- {
- int reg = (word & 0x03e00000) >> 21;
- reg_mask |= 1 << reg;
-
- /* Do not compute the address where the register was saved yet,
- because we don't know yet if the offset will need to be
- relative to $sp or $fp (we can not compute the address relative
- to $sp if $sp is updated during the execution of the current
- subroutine, for instance when doing some alloca). So just store
- the offset for the moment, and compute the address later
- when we know whether this frame has a frame pointer or not.
- */
- temp_saved_regs[reg] = (short) word;
-
- /* Starting with OSF/1-3.2C, the system libraries are shipped
- without local symbols, but they still contain procedure
- descriptors without a symbol reference. GDB is currently
- unable to find these procedure descriptors and uses
- heuristic_proc_desc instead.
- As some low level compiler support routines (__div*, __add*)
- use a non-standard return address register, we have to
- add some heuristics to determine the return address register,
- or stepping over these routines will fail.
- Usually the return address register is the first register
- saved on the stack, but assembler optimization might
- rearrange the register saves.
- So we recognize only a few registers (t7, t9, ra) within
- the procedure prologue as valid return address registers.
- If we encounter a return instruction, we extract the
- the return address register from it.
-
- FIXME: Rewriting GDB to access the procedure descriptors,
- e.g. via the minimal symbol table, might obviate this hack. */
- if (pcreg == -1
- && cur_pc < (start_pc + 80)
- && (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM
- || reg == ALPHA_RA_REGNUM))
- pcreg = reg;
+ default:
+ break;
}
- else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
- pcreg = (word >> 16) & 0x1f;
- else if (word == 0x47de040f || word == 0x47fe040f) /* bis sp,sp fp */
- {
- /* ??? I am not sure what instruction is 0x47fe040f, and I
- am suspecting that there was a typo and should have been
- 0x47fe040f. I'm keeping it in the test above until further
- investigation */
- has_frame_reg = 1;
- vfp = read_next_frame_reg (next_frame, ALPHA_GCC_FP_REGNUM);
- }
+ 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);
}
- if (pcreg == -1)
- {
- /* If we haven't found a valid return address register yet,
- keep searching in the procedure prologue. */
- while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
- {
- char buf[4];
- unsigned long word;
- if (read_memory_nobpt (cur_pc, buf, 4))
- break;
- cur_pc += 4;
- word = extract_unsigned_integer (buf, 4);
+ /* Determine required argument register loads, loading an argument register
+ is expensive as it uses three ptrace calls. */
+ required_arg_regs = accumulate_size / 8;
+ if (required_arg_regs > ALPHA_NUM_ARG_REGS)
+ required_arg_regs = ALPHA_NUM_ARG_REGS;
+
+ /* Make room for the arguments on the stack. */
+ if (accumulate_size < sizeof(arg_reg_buffer))
+ accumulate_size = 0;
+ else
+ accumulate_size -= sizeof(arg_reg_buffer);
+ sp -= accumulate_size;
+
+ /* Keep sp aligned to a multiple of 16 as the ABI requires. */
+ sp &= ~15;
+
+ /* `Push' arguments on the stack. */
+ for (i = nargs; m_arg--, --i >= 0;)
+ {
+ const gdb_byte *contents = m_arg->contents;
+ int offset = m_arg->offset;
+ int len = m_arg->len;
- if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
- && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ /* Copy the bytes destined for registers into arg_reg_buffer. */
+ if (offset < sizeof(arg_reg_buffer))
+ {
+ if (offset + len <= sizeof(arg_reg_buffer))
{
- int reg = (word & 0x03e00000) >> 21;
- if (reg == ALPHA_T7_REGNUM || reg == ALPHA_T9_REGNUM
- || reg == ALPHA_RA_REGNUM)
- {
- pcreg = reg;
- break;
- }
+ memcpy (arg_reg_buffer + offset, contents, len);
+ continue;
}
- else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ else
{
- pcreg = (word >> 16) & 0x1f;
- break;
+ int tlen = sizeof(arg_reg_buffer) - offset;
+ memcpy (arg_reg_buffer + offset, contents, tlen);
+ offset += tlen;
+ contents += tlen;
+ len -= tlen;
}
}
+
+ /* Everything else goes to the stack. */
+ write_memory (sp + offset - sizeof(arg_reg_buffer), contents, len);
}
+ if (return_method == return_method_struct)
+ store_unsigned_integer (arg_reg_buffer, ALPHA_REGISTER_SIZE,
+ byte_order, struct_addr);
- if (has_frame_reg)
- PROC_FRAME_REG (&temp_proc_desc) = ALPHA_GCC_FP_REGNUM;
- else
- PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
-
- /* At this point, we know which of the Stack Pointer or the Frame Pointer
- to use as the reference address to compute the saved registers address.
- But in both cases, the processing above has set vfp to this reference
- address, so just need to increment the offset of each saved register
- by this address. */
- for (regno = 0; regno < NUM_REGS; regno++)
+ /* Load the argument registers. */
+ for (i = 0; i < required_arg_regs; i++)
{
- if (reg_mask & 1 << regno)
- temp_saved_regs[regno] += vfp;
+ regcache->cooked_write (ALPHA_A0_REGNUM + i,
+ arg_reg_buffer + i * ALPHA_REGISTER_SIZE);
+ regcache->cooked_write (ALPHA_FPA0_REGNUM + i,
+ arg_reg_buffer + i * ALPHA_REGISTER_SIZE);
}
- PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size;
- PROC_REG_MASK (&temp_proc_desc) = reg_mask;
- PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? ALPHA_RA_REGNUM : pcreg;
- PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */
- return &temp_proc_desc;
+ /* Finally, update the stack pointer. */
+ regcache_cooked_write_signed (regcache, ALPHA_SP_REGNUM, sp);
+
+ return sp;
}
-/* This returns the PC of the first inst after the prologue. If we can't
- find the prologue, then return 0. */
+/* Extract from REGCACHE the value about to be returned from a function
+ and copy it into VALBUF. */
-static CORE_ADDR
-after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
+static void
+alpha_extract_return_value (struct type *valtype, struct regcache *regcache,
+ gdb_byte *valbuf)
{
- struct symtab_and_line sal;
- CORE_ADDR func_addr, func_end;
-
- if (!proc_desc)
- proc_desc = find_proc_desc (pc, NULL);
+ struct gdbarch *gdbarch = regcache->arch ();
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
+ ULONGEST l;
- if (proc_desc)
+ switch (TYPE_CODE (valtype))
{
- if (alpha_proc_desc_is_dyn_sigtramp (proc_desc))
- return PROC_LOW_ADDR (proc_desc); /* "prologue" is in kernel */
-
- /* If function is frameless, then we need to do it the hard way. I
- strongly suspect that frameless always means prologueless... */
- if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0)
- return 0;
- }
-
- if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- return 0; /* Unknown */
+ case TYPE_CODE_FLT:
+ switch (TYPE_LENGTH (valtype))
+ {
+ case 4:
+ regcache->cooked_read (ALPHA_FP0_REGNUM, raw_buffer);
+ alpha_sts (gdbarch, valbuf, raw_buffer);
+ break;
- sal = find_pc_line (func_addr, 0);
+ case 8:
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
+ break;
- if (sal.end < func_end)
- return sal.end;
+ case 16:
+ regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
+ read_memory (l, valbuf, 16);
+ break;
- /* The line after the prologue is after the end of the function. In this
- case, tell the caller to find the prologue the hard way. */
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
+ }
+ break;
- return 0;
-}
+ case TYPE_CODE_COMPLEX:
+ switch (TYPE_LENGTH (valtype))
+ {
+ case 8:
+ /* ??? This isn't correct wrt the ABI, but it's what GCC does. */
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
+ break;
-/* Return non-zero if we *might* be in a function prologue. Return zero if we
- are definitively *not* in a function prologue. */
+ case 16:
+ regcache->cooked_read (ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_read (ALPHA_FP0_REGNUM + 1, valbuf + 8);
+ break;
-static int
-alpha_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
-{
- CORE_ADDR after_prologue_pc;
+ case 32:
+ regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
+ read_memory (l, valbuf, 32);
+ break;
- after_prologue_pc = after_prologue (pc, proc_desc);
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
+ }
+ break;
- if (after_prologue_pc == 0
- || pc < after_prologue_pc)
- return 1;
- else
- return 0;
+ default:
+ /* Assume everything else degenerates to an integer. */
+ regcache_cooked_read_unsigned (regcache, ALPHA_V0_REGNUM, &l);
+ store_unsigned_integer (valbuf, TYPE_LENGTH (valtype), byte_order, l);
+ break;
+ }
}
-static alpha_extra_func_info_t
-find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame)
+/* 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 gdb_byte *valbuf)
{
- alpha_extra_func_info_t proc_desc;
- struct block *b;
- struct symbol *sym;
- CORE_ADDR startaddr;
-
- /* Try to get the proc_desc from the linked call dummy proc_descs
- if the pc is in the call dummy.
- This is hairy. In the case of nested dummy calls we have to find the
- right proc_desc, but we might not yet know the frame for the dummy
- as it will be contained in the proc_desc we are searching for.
- So we have to find the proc_desc whose frame is closest to the current
- stack pointer. */
-
- if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
- {
- struct linked_proc_info *link;
- CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
- alpha_extra_func_info_t found_proc_desc = NULL;
- long min_distance = LONG_MAX;
+ struct gdbarch *gdbarch = regcache->arch ();
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
+ ULONGEST l;
- for (link = linked_proc_desc_table; link; link = link->next)
+ switch (TYPE_CODE (valtype))
+ {
+ case TYPE_CODE_FLT:
+ switch (TYPE_LENGTH (valtype))
{
- long distance = (CORE_ADDR) PROC_DUMMY_FRAME (&link->info) - sp;
- if (distance > 0 && distance < min_distance)
- {
- min_distance = distance;
- found_proc_desc = &link->info;
- }
+ case 4:
+ alpha_lds (gdbarch, raw_buffer, valbuf);
+ regcache->cooked_write (ALPHA_FP0_REGNUM, raw_buffer);
+ break;
+
+ case 8:
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
+ break;
+
+ case 16:
+ /* 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."));
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
}
- if (found_proc_desc != NULL)
- return found_proc_desc;
- }
+ break;
- b = block_for_pc (pc);
+ case TYPE_CODE_COMPLEX:
+ switch (TYPE_LENGTH (valtype))
+ {
+ case 8:
+ /* ??? This isn't correct wrt the ABI, but it's what GCC does. */
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
+ break;
- find_pc_partial_function (pc, NULL, &startaddr, NULL);
- if (b == NULL)
- sym = NULL;
- else
- {
- if (startaddr > BLOCK_START (b))
- /* This is the "pathological" case referred to in a comment in
- print_frame_info. It might be better to move this check into
- symbol reading. */
- sym = NULL;
- else
- sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_NAMESPACE,
- 0, NULL);
+ case 16:
+ regcache->cooked_write (ALPHA_FP0_REGNUM, valbuf);
+ regcache->cooked_write (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."));
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("unknown floating point width"));
+ }
+ break;
+
+ default:
+ /* Assume everything else degenerates to an integer. */
+ /* 32-bit values must be sign-extended to 64 bits
+ even if the base data type is unsigned. */
+ if (TYPE_LENGTH (valtype) == 4)
+ valtype = builtin_type (gdbarch)->builtin_int32;
+ l = unpack_long (valtype, valbuf);
+ regcache_cooked_write_unsigned (regcache, ALPHA_V0_REGNUM, l);
+ break;
}
+}
- /* If we never found a PDR for this function in symbol reading, then
- examine prologues to find the information. */
- if (sym && ((mips_extra_func_info_t) SYMBOL_VALUE (sym))->pdr.framereg == -1)
- sym = NULL;
+static enum return_value_convention
+alpha_return_value (struct gdbarch *gdbarch, struct value *function,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ enum type_code code = TYPE_CODE (type);
- if (sym)
+ if ((code == TYPE_CODE_STRUCT
+ || code == TYPE_CODE_UNION
+ || code == TYPE_CODE_ARRAY)
+ && gdbarch_tdep (gdbarch)->return_in_memory (type))
{
- /* IF this is the topmost frame AND
- * (this proc does not have debugging information OR
- * the PC is in the procedure prologue)
- * THEN create a "heuristic" proc_desc (by analyzing
- * the actual code) to replace the "official" proc_desc.
- */
- proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym);
- if (next_frame == NULL)
+ if (readbuf)
{
- if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc))
- {
- alpha_extra_func_info_t found_heuristic =
- heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
- pc, next_frame);
- if (found_heuristic)
- {
- PROC_LOCALOFF (found_heuristic) =
- PROC_LOCALOFF (proc_desc);
- PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
- proc_desc = found_heuristic;
- }
- }
+ ULONGEST addr;
+ regcache_raw_read_unsigned (regcache, ALPHA_V0_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
}
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
- else
- {
- long offset;
-
- /* Is linked_proc_desc_table really necessary? It only seems to be used
- by procedure call dummys. However, the procedures being called ought
- to have their own proc_descs, and even if they don't,
- heuristic_proc_desc knows how to create them! */
-
- register struct linked_proc_info *link;
- for (link = linked_proc_desc_table; link; link = link->next)
- if (PROC_LOW_ADDR (&link->info) <= pc
- && PROC_HIGH_ADDR (&link->info) > pc)
- return &link->info;
-
- /* If PC is inside a dynamically generated sigtramp handler,
- create and push a procedure descriptor for that code: */
- offset = alpha_dynamic_sigtramp_offset (pc);
- if (offset >= 0)
- return push_sigtramp_desc (pc - offset);
-
- /* If heuristic_fence_post is non-zero, determine the procedure
- start address by examining the instructions.
- This allows us to find the start address of static functions which
- have no symbolic information, as startaddr would have been set to
- the preceding global function start address by the
- find_pc_partial_function call above. */
- if (startaddr == 0 || heuristic_fence_post != 0)
- startaddr = heuristic_proc_start (pc);
-
- proc_desc =
- heuristic_proc_desc (startaddr, pc, next_frame);
- }
- return proc_desc;
+
+ if (readbuf)
+ alpha_extract_return_value (type, regcache, readbuf);
+ if (writebuf)
+ alpha_store_return_value (type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
-alpha_extra_func_info_t cached_proc_desc;
+static int
+alpha_return_in_memory_always (struct type *type)
+{
+ return 1;
+}
+\f
-static CORE_ADDR
-alpha_frame_chain (struct frame_info *frame)
+constexpr gdb_byte alpha_break_insn[] = { 0x80, 0, 0, 0 }; /* call_pal bpt */
+
+typedef BP_MANIPULATION (alpha_break_insn) alpha_breakpoint;
+
+\f
+/* This returns the PC of the first insn after the prologue.
+ If we can't find the prologue, then return 0. */
+
+CORE_ADDR
+alpha_after_prologue (CORE_ADDR pc)
{
- alpha_extra_func_info_t proc_desc;
- CORE_ADDR saved_pc = FRAME_SAVED_PC (frame);
+ struct symtab_and_line sal;
+ CORE_ADDR func_addr, func_end;
- if (saved_pc == 0 || inside_entry_file (saved_pc))
+ if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
return 0;
- proc_desc = find_proc_desc (saved_pc, frame);
- if (!proc_desc)
- return 0;
+ sal = find_pc_line (func_addr, 0);
+ if (sal.end < func_end)
+ return sal.end;
- cached_proc_desc = proc_desc;
-
- /* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY (proc_desc))
- return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
-
- /* If no frame pointer and frame size is zero, we must be at end
- of stack (or otherwise hosed). If we don't check frame size,
- we loop forever if we see a zero size frame. */
- if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0
- /* The previous frame from a sigtramp frame might be frameless
- and have frame size zero. */
- && !(get_frame_type (frame) == SIGTRAMP_FRAME))
- return alpha_frame_past_sigtramp_frame (frame, saved_pc);
- else
- return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc))
- + PROC_FRAME_OFFSET (proc_desc);
+ /* The line after the prologue is after the end of the function. In this
+ case, tell the caller to find the prologue the hard way. */
+ return 0;
}
-void
-alpha_print_extra_frame_info (struct frame_info *fi)
+/* Read an instruction from memory at PC, looking through breakpoints. */
+
+unsigned int
+alpha_read_insn (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- if (fi
- && get_frame_extra_info (fi)
- && get_frame_extra_info (fi)->proc_desc
- && get_frame_extra_info (fi)->proc_desc->pdr.framereg < NUM_REGS)
- printf_filtered (" frame pointer is at %s+%s\n",
- REGISTER_NAME (get_frame_extra_info (fi)->proc_desc->pdr.framereg),
- paddr_d (get_frame_extra_info (fi)->proc_desc->pdr.frameoffset));
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[ALPHA_INSN_SIZE];
+ int res;
+
+ res = target_read_memory (pc, buf, sizeof (buf));
+ if (res != 0)
+ memory_error (TARGET_XFER_E_IO, pc);
+ return extract_unsigned_integer (buf, sizeof (buf), byte_order);
}
-static void
-alpha_init_extra_frame_info (int fromleaf, struct frame_info *frame)
+/* To skip prologues, I use this predicate. Returns either PC itself
+ if the code at PC does not look like a function prologue; otherwise
+ returns an address that (if we're lucky) follows the prologue. If
+ LENIENT, then we must skip everything which is involved in setting
+ up the frame (it's OK to skip more, just so long as we don't skip
+ anything which might clobber the registers which are being saved. */
+
+static CORE_ADDR
+alpha_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ unsigned long inst;
+ int offset;
+ CORE_ADDR post_prologue_pc;
+ 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
+ prologue for quickstarted shared library functions when the
+ shared library is not yet mapped in.
+ 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, sizeof (buf)))
+ return pc;
+
+ /* See if we can determine the end of the prologue via the symbol table.
+ If so, then return either PC, or the PC after the prologue, whichever
+ is greater. */
+
+ post_prologue_pc = alpha_after_prologue (pc);
+ if (post_prologue_pc != 0)
+ return std::max (pc, post_prologue_pc);
+
+ /* Can't determine prologue from the symbol table, need to examine
+ instructions. */
+
+ /* 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 += ALPHA_INSN_SIZE)
+ {
+ inst = alpha_read_insn (gdbarch, pc + offset);
+
+ if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ continue;
+ if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
+ continue;
+
+ if (((inst & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ || (inst & 0xfc1f0000) == 0x9c1e0000) /* stt reg,n($sp) */
+ && (inst & 0x03e00000) != 0x03e00000) /* reg != $zero */
+ continue;
+
+ if (inst == 0x47de040f) /* bis sp,sp,fp */
+ continue;
+ if (inst == 0x47fe040f) /* bis zero,sp,fp */
+ continue;
+
+ break;
+ }
+ return pc + offset;
+}
+
+\f
+static const int ldl_l_opcode = 0x2a;
+static const int ldq_l_opcode = 0x2b;
+static const int stl_c_opcode = 0x2e;
+static const int stq_c_opcode = 0x2f;
+
+/* Checks for an atomic sequence of instructions beginning with a LDL_L/LDQ_L
+ instruction and ending with a STL_C/STQ_C instruction. If such a sequence
+ is found, attempt to step through it. A breakpoint is placed at the end of
+ the sequence. */
+
+static std::vector<CORE_ADDR>
+alpha_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- /* Use proc_desc calculated in frame_chain */
- alpha_extra_func_info_t proc_desc =
- get_next_frame (frame)
- ? cached_proc_desc
- : find_proc_desc (get_frame_pc (frame), get_next_frame (frame));
-
- frame_extra_info_zalloc (frame, sizeof (struct frame_extra_info));
-
- /* NOTE: cagney/2003-01-03: No need to set saved_regs to NULL,
- always NULL by default. */
- /* frame->saved_regs = NULL; */
- get_frame_extra_info (frame)->localoff = 0;
- get_frame_extra_info (frame)->pc_reg = ALPHA_RA_REGNUM;
- get_frame_extra_info (frame)->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc;
- if (proc_desc)
+ CORE_ADDR breaks[2] = {CORE_ADDR_MAX, CORE_ADDR_MAX};
+ CORE_ADDR loc = pc;
+ CORE_ADDR closing_insn; /* Instruction that closes the atomic sequence. */
+ unsigned int insn = alpha_read_insn (gdbarch, loc);
+ int insn_count;
+ int index;
+ int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */
+ const int atomic_sequence_length = 16; /* Instruction sequence length. */
+ int bc_insn_count = 0; /* Conditional branch instruction count. */
+
+ /* Assume all atomic sequences start with a LDL_L/LDQ_L instruction. */
+ if (INSN_OPCODE (insn) != ldl_l_opcode
+ && INSN_OPCODE (insn) != ldq_l_opcode)
+ return {};
+
+ /* Assume that no atomic sequence is longer than "atomic_sequence_length"
+ instructions. */
+ for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
{
- /* Get the locals offset and the saved pc register from the
- procedure descriptor, they are valid even if we are in the
- middle of the prologue. */
- get_frame_extra_info (frame)->localoff = PROC_LOCALOFF (proc_desc);
- get_frame_extra_info (frame)->pc_reg = PROC_PC_REG (proc_desc);
-
- /* Fixup frame-pointer - only needed for top frame */
-
- /* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY (proc_desc))
- deprecated_update_frame_base_hack (frame, (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc));
-
- /* This may not be quite right, if proc has a real frame register.
- Get the value of the frame relative sp, procedure might have been
- interrupted by a signal at it's very start. */
- else if (get_frame_pc (frame) == PROC_LOW_ADDR (proc_desc)
- && !alpha_proc_desc_is_dyn_sigtramp (proc_desc))
- deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), SP_REGNUM));
- else
- deprecated_update_frame_base_hack (frame, read_next_frame_reg (get_next_frame (frame), PROC_FRAME_REG (proc_desc))
- + PROC_FRAME_OFFSET (proc_desc));
+ loc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, loc);
- if (proc_desc == &temp_proc_desc)
+ /* Assume that there is at most one branch in the atomic
+ sequence. If a branch is found, put a breakpoint in
+ its destination address. */
+ if (INSN_OPCODE (insn) >= br_opcode)
{
- char *name;
-
- /* Do not set the saved registers for a sigtramp frame,
- alpha_find_saved_registers will do that for us. We can't
- use (get_frame_type (frame) == SIGTRAMP_FRAME), it is not
- yet set. */
- /* FIXME: cagney/2002-11-18: This problem will go away once
- frame.c:get_prev_frame() is modified to set the frame's
- type before calling functions like this. */
- find_pc_partial_function (get_frame_pc (frame), &name,
- (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
- if (!PC_IN_SIGTRAMP (get_frame_pc (frame), name))
- {
- frame_saved_regs_zalloc (frame);
- memcpy (get_frame_saved_regs (frame), temp_saved_regs,
- SIZEOF_FRAME_SAVED_REGS);
- get_frame_saved_regs (frame)[PC_REGNUM]
- = get_frame_saved_regs (frame)[ALPHA_RA_REGNUM];
- }
+ int immediate = (insn & 0x001fffff) << 2;
+
+ immediate = (immediate ^ 0x400000) - 0x400000;
+
+ if (bc_insn_count >= 1)
+ return {}; /* More than one branch found, fallback
+ to the standard single-step code. */
+
+ breaks[1] = loc + ALPHA_INSN_SIZE + immediate;
+
+ bc_insn_count++;
+ last_breakpoint++;
}
+
+ if (INSN_OPCODE (insn) == stl_c_opcode
+ || INSN_OPCODE (insn) == stq_c_opcode)
+ break;
}
+
+ /* Assume that the atomic sequence ends with a STL_C/STQ_C instruction. */
+ if (INSN_OPCODE (insn) != stl_c_opcode
+ && INSN_OPCODE (insn) != stq_c_opcode)
+ return {};
+
+ closing_insn = loc;
+ loc += ALPHA_INSN_SIZE;
+
+ /* Insert a breakpoint right after the end of the atomic sequence. */
+ breaks[0] = loc;
+
+ /* Check for duplicated breakpoints. Check also for a breakpoint
+ placed (branch instruction's destination) anywhere in sequence. */
+ if (last_breakpoint
+ && (breaks[1] == breaks[0]
+ || (breaks[1] >= pc && breaks[1] <= closing_insn)))
+ last_breakpoint = 0;
+
+ std::vector<CORE_ADDR> next_pcs;
+
+ for (index = 0; index <= last_breakpoint; index++)
+ next_pcs.push_back (breaks[index]);
+
+ return next_pcs;
}
-static CORE_ADDR
-alpha_frame_locals_address (struct frame_info *fi)
+\f
+/* Figure out where the longjmp will land.
+ We expect the first arg to be a pointer to the jmp_buf structure from
+ which we extract the PC (JB_PC) that we will land at. The PC is copied
+ into the "pc". This routine returns true on success. */
+
+static int
+alpha_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
- return (get_frame_base (fi) - get_frame_extra_info (fi)->localoff);
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR jb_addr;
+ gdb_byte raw_buffer[ALPHA_REGISTER_SIZE];
+
+ 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))
+ return 0;
+
+ *pc = extract_unsigned_integer (raw_buffer, tdep->jb_elt_size, byte_order);
+ return 1;
}
-static CORE_ADDR
-alpha_frame_args_address (struct frame_info *fi)
+\f
+/* Frame unwinder for signal trampolines. We use alpha tdep bits that
+ describe the location and shape of the sigcontext structure. After
+ that, all registers are in memory, so it's easy. */
+/* ??? Shouldn't we be able to do this generically, rather than with
+ OSABI data specific to Alpha? */
+
+struct alpha_sigtramp_unwind_cache
{
- return (get_frame_base (fi) - (ALPHA_NUM_ARG_REGS * 8));
-}
+ CORE_ADDR sigcontext_addr;
+};
-/* 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.
+static struct alpha_sigtramp_unwind_cache *
+alpha_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct alpha_sigtramp_unwind_cache *info;
+ struct gdbarch_tdep *tdep;
- 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.
+ if (*this_prologue_cache)
+ return (struct alpha_sigtramp_unwind_cache *) *this_prologue_cache;
- 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. */
+ info = FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache);
+ *this_prologue_cache = info;
-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");
+ tdep = gdbarch_tdep (get_frame_arch (this_frame));
+ info->sigcontext_addr = tdep->sigcontext_addr (this_frame);
- return create_new_frame (argv[0], argv[1]);
+ return info;
}
-/* The alpha passes the first six arguments in the registers, the rest on
- the stack. The register arguments are eventually transferred to the
- argument transfer area immediately below the stack by the called function
- anyway. So we `push' at least six arguments on the stack, `reload' the
- argument registers and then adjust the stack pointer to point past the
- sixth argument. This algorithm simplifies the passing of a large struct
- which extends from the registers to the stack.
- If the called function is returning a structure, the address of the
- structure to be returned is passed as a hidden first argument. */
+/* 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_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+alpha_sigtramp_register_address (struct gdbarch *gdbarch,
+ CORE_ADDR sigcontext_addr, int regnum)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (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;
+}
+
+/* Given a GDB frame, determine the address of the calling function's
+ frame. This will be used to create a new GDB frame struct. */
+
+static void
+alpha_sigtramp_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- int i;
- int accumulate_size = struct_return ? 8 : 0;
- int arg_regs_size = ALPHA_NUM_ARG_REGS * 8;
- struct alpha_arg
- {
- char *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 raw_buffer[sizeof (CORE_ADDR)];
- int required_arg_regs;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ struct alpha_sigtramp_unwind_cache *info
+ = alpha_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ CORE_ADDR stack_addr, code_addr;
+
+ /* If the OSABI couldn't locate the sigcontext, give up. */
+ if (info->sigcontext_addr == 0)
+ return;
- for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++)
+ /* 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. */
+ if (tdep->dynamic_sigtramp_offset)
{
- struct value *arg = args[i];
- 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))
- {
- case TYPE_CODE_INT:
- case TYPE_CODE_BOOL:
- case TYPE_CODE_CHAR:
- case TYPE_CODE_RANGE:
- case TYPE_CODE_ENUM:
- if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long))
- {
- arg_type = builtin_type_long;
- arg = value_cast (arg_type, arg);
- }
- break;
- default:
- break;
- }
- 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);
+ int offset;
+ code_addr = get_frame_pc (this_frame);
+ offset = tdep->dynamic_sigtramp_offset (gdbarch, code_addr);
+ if (offset >= 0)
+ code_addr -= offset;
+ else
+ code_addr = 0;
}
+ else
+ code_addr = get_frame_func (this_frame);
- /* Determine required argument register loads, loading an argument register
- is expensive as it uses three ptrace calls. */
- required_arg_regs = accumulate_size / 8;
- if (required_arg_regs > ALPHA_NUM_ARG_REGS)
- required_arg_regs = ALPHA_NUM_ARG_REGS;
-
- /* Make room for the arguments on the stack. */
- if (accumulate_size < arg_regs_size)
- accumulate_size = arg_regs_size;
- sp -= accumulate_size;
+ /* The stack address is trivially read from the sigcontext. */
+ stack_addr = alpha_sigtramp_register_address (gdbarch, info->sigcontext_addr,
+ ALPHA_SP_REGNUM);
+ stack_addr = get_frame_memory_unsigned (this_frame, stack_addr,
+ ALPHA_REGISTER_SIZE);
- /* Keep sp aligned to a multiple of 16 as the compiler does it too. */
- sp &= ~15;
+ *this_id = frame_id_build (stack_addr, code_addr);
+}
- /* `Push' arguments on the stack. */
- for (i = nargs; m_arg--, --i >= 0;)
- write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len);
- if (struct_return)
- {
- store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr);
- write_memory (sp, raw_buffer, sizeof (CORE_ADDR));
- }
+/* Retrieve the value of REGNUM in FRAME. Don't give up! */
- /* Load the argument registers. */
- for (i = 0; i < required_arg_regs; i++)
- {
- LONGEST val;
+static struct value *
+alpha_sigtramp_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct alpha_sigtramp_unwind_cache *info
+ = alpha_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+ CORE_ADDR addr;
- val = read_memory_integer (sp + i * 8, 8);
- write_register (ALPHA_A0_REGNUM + i, val);
- write_register (ALPHA_FPA0_REGNUM + i, val);
+ if (info->sigcontext_addr != 0)
+ {
+ /* All integer and fp registers are stored in memory. */
+ addr = alpha_sigtramp_register_address (get_frame_arch (this_frame),
+ info->sigcontext_addr, regnum);
+ if (addr != 0)
+ return frame_unwind_got_memory (this_frame, regnum, addr);
}
- return sp + arg_regs_size;
+ /* This extra register may actually be in the sigcontext, but our
+ 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. */
+ return frame_unwind_got_register (this_frame, regnum, regnum);
}
-static void
-alpha_push_dummy_frame (void)
+static int
+alpha_sigtramp_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- int ireg;
- struct linked_proc_info *link;
- alpha_extra_func_info_t proc_desc;
- CORE_ADDR sp = read_register (SP_REGNUM);
- CORE_ADDR save_address;
- char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
- unsigned long mask;
-
- link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info));
- link->next = linked_proc_desc_table;
- linked_proc_desc_table = link;
-
- proc_desc = &link->info;
-
- /*
- * The registers we must save are all those not preserved across
- * procedure calls.
- * In addition, we must save the PC and RA.
- *
- * Dummy frame layout:
- * (high memory)
- * Saved PC
- * Saved F30
- * ...
- * Saved F0
- * Saved R29
- * ...
- * Saved R0
- * Saved R26 (RA)
- * Parameter build area
- * (low memory)
- */
-
-/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
-#define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1))
-#define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29))
-#define GEN_REG_SAVE_COUNT 24
-#define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30))
-#define FLOAT_REG_SAVE_COUNT 23
- /* The special register is the PC as we have no bit for it in the save masks.
- alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */
-#define SPECIAL_REG_SAVE_COUNT 1
-
- PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK;
- PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK;
- /* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA,
- but keep SP aligned to a multiple of 16. */
- PROC_REG_OFFSET (proc_desc) =
- -((8 * (SPECIAL_REG_SAVE_COUNT
- + GEN_REG_SAVE_COUNT
- + FLOAT_REG_SAVE_COUNT)
- + 15) & ~15);
- PROC_FREG_OFFSET (proc_desc) =
- PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT;
-
- /* Save general registers.
- The return address register is the first saved register, all other
- registers follow in ascending order.
- The PC is saved immediately below the SP. */
- save_address = sp + PROC_REG_OFFSET (proc_desc);
- store_address (raw_buffer, 8, read_register (ALPHA_RA_REGNUM));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- mask = PROC_REG_MASK (proc_desc) & 0xffffffffL;
- for (ireg = 0; mask; ireg++, mask >>= 1)
- if (mask & 1)
- {
- if (ireg == ALPHA_RA_REGNUM)
- continue;
- store_address (raw_buffer, 8, read_register (ireg));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- }
-
- store_address (raw_buffer, 8, read_register (PC_REGNUM));
- write_memory (sp - 8, raw_buffer, 8);
-
- /* Save floating point registers. */
- save_address = sp + PROC_FREG_OFFSET (proc_desc);
- mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL;
- for (ireg = 0; mask; ireg++, mask >>= 1)
- if (mask & 1)
- {
- store_address (raw_buffer, 8, read_register (ireg + FP0_REGNUM));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- }
-
- /* Set and save the frame address for the dummy.
- This is tricky. The only registers that are suitable for a frame save
- are those that are preserved across procedure calls (s0-s6). But if
- a read system call is interrupted and then a dummy call is made
- (see testsuite/gdb.t17/interrupt.exp) the dummy call hangs till the read
- is satisfied. Then it returns with the s0-s6 registers set to the values
- on entry to the read system call and our dummy frame pointer would be
- destroyed. So we save the dummy frame in the proc_desc and handle the
- retrieval of the frame pointer of a dummy specifically. The frame register
- is set to the virtual frame (pseudo) register, it's value will always
- be read as zero and will help us to catch any errors in the dummy frame
- retrieval code. */
- PROC_DUMMY_FRAME (proc_desc) = sp;
- PROC_FRAME_REG (proc_desc) = FP_REGNUM;
- PROC_FRAME_OFFSET (proc_desc) = 0;
- sp += PROC_REG_OFFSET (proc_desc);
- write_register (SP_REGNUM, sp);
-
- PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS ();
- PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4;
-
- SET_PROC_DESC_IS_DUMMY (proc_desc);
- PROC_PC_REG (proc_desc) = ALPHA_RA_REGNUM;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ const char *name;
+
+ /* NOTE: cagney/2004-04-30: Do not copy/clone this code. Instead
+ look at tramp-frame.h and other simpler 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 handler. */
+ if (gdbarch_tdep (gdbarch)->sigcontext_addr == NULL)
+ return 0;
+ if (gdbarch_tdep (gdbarch)->pc_in_sigtramp == NULL)
+ return 0;
+
+ /* Otherwise we should be in a signal frame. */
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (gdbarch_tdep (gdbarch)->pc_in_sigtramp (gdbarch, pc, name))
+ return 1;
+
+ return 0;
}
-static void
-alpha_pop_frame (void)
-{
- register int regnum;
- struct frame_info *frame = get_current_frame ();
- CORE_ADDR new_sp = get_frame_base (frame);
+static const struct frame_unwind alpha_sigtramp_frame_unwind = {
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ alpha_sigtramp_frame_this_id,
+ alpha_sigtramp_frame_prev_register,
+ NULL,
+ alpha_sigtramp_frame_sniffer
+};
- alpha_extra_func_info_t proc_desc = get_frame_extra_info (frame)->proc_desc;
+\f
- /* we need proc_desc to know how to restore the registers;
- if it is NULL, construct (a temporary) one */
- if (proc_desc == NULL)
- proc_desc = find_proc_desc (get_frame_pc (frame), get_next_frame (frame));
+/* Heuristic_proc_start may hunt through the text section for a long
+ time across a 2400 baud serial line. Allows the user to limit this
+ search. */
+static int heuristic_fence_post = 0;
- /* Question: should we copy this proc_desc and save it in
- frame->proc_desc? If we do, who will free it?
- For now, we don't save a copy... */
+/* Attempt to locate the start of the function containing PC. We assume that
+ the previous function ends with an about_to_return insn. Not foolproof by
+ any means, since gcc is happy to put the epilogue in the middle of a
+ function. But we're guessing anyway... */
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
- if (get_frame_saved_regs (frame) == NULL)
- alpha_find_saved_regs (frame);
- if (proc_desc)
- {
- for (regnum = 32; --regnum >= 0;)
- if (PROC_REG_MASK (proc_desc) & (1 << regnum))
- write_register (regnum,
- read_memory_integer (get_frame_saved_regs (frame)[regnum],
- 8));
- for (regnum = 32; --regnum >= 0;)
- if (PROC_FREG_MASK (proc_desc) & (1 << regnum))
- write_register (regnum + FP0_REGNUM,
- read_memory_integer (get_frame_saved_regs (frame)[regnum + FP0_REGNUM], 8));
- }
- write_register (SP_REGNUM, new_sp);
- flush_cached_frames ();
+static CORE_ADDR
+alpha_heuristic_proc_start (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ CORE_ADDR last_non_nop = pc;
+ CORE_ADDR fence = pc - heuristic_fence_post;
+ CORE_ADDR orig_pc = pc;
+ CORE_ADDR func;
+ struct inferior *inf;
+
+ if (pc == 0)
+ return 0;
- if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc)
- || alpha_proc_desc_is_dyn_sigtramp (proc_desc)))
- {
- struct linked_proc_info *pi_ptr, *prev_ptr;
+ /* First see if we can find the start of the function from minimal
+ symbol information. This can succeed with a binary that doesn't
+ have debug info, but hasn't been stripped. */
+ func = get_pc_function_start (pc);
+ if (func)
+ return func;
+
+ if (heuristic_fence_post == -1
+ || fence < tdep->vm_min_address)
+ fence = tdep->vm_min_address;
- for (pi_ptr = linked_proc_desc_table, prev_ptr = NULL;
- pi_ptr != NULL;
- prev_ptr = pi_ptr, pi_ptr = pi_ptr->next)
+ /* 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 -= ALPHA_INSN_SIZE; pc >= fence; pc -= ALPHA_INSN_SIZE)
+ {
+ unsigned int insn = alpha_read_insn (gdbarch, pc);
+ switch (insn)
{
- if (&pi_ptr->info == proc_desc)
- break;
+ case 0: /* invalid insn */
+ case 0x6bfa8001: /* ret $31,($26),1 */
+ return last_non_nop;
+
+ case 0x2ffe0000: /* unop: ldq_u $31,0($30) */
+ case 0x47ff041f: /* nop: bis $31,$31,$31 */
+ break;
+
+ default:
+ last_non_nop = pc;
+ break;
}
+ }
+
+ inf = current_inferior ();
- if (pi_ptr == NULL)
- error ("Can't locate dummy extra frame info\n");
+ /* It's not clear to me why we reach this point when stopping quietly,
+ but with this test, at least we don't print out warnings for every
+ child forked (eg, on decstation). 22apr93 rich@cygnus.com. */
+ if (inf->control.stop_soon == NO_STOP_QUIETLY)
+ {
+ static int blurb_printed = 0;
- if (prev_ptr != NULL)
- prev_ptr->next = pi_ptr->next;
+ if (fence == tdep->vm_min_address)
+ warning (_("Hit beginning of text section without finding \
+enclosing function for address %s"), paddress (gdbarch, orig_pc));
else
- linked_proc_desc_table = pi_ptr->next;
+ warning (_("Hit heuristic-fence-post without finding \
+enclosing function for address %s"), paddress (gdbarch, orig_pc));
- xfree (pi_ptr);
+ if (!blurb_printed)
+ {
+ 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"));
+ blurb_printed = 1;
+ }
}
+
+ return 0;
}
-\f
-/* To skip prologues, I use this predicate. Returns either PC itself
- if the code at PC does not look like a function prologue; otherwise
- returns an address that (if we're lucky) follows the prologue. If
- LENIENT, then we must skip everything which is involved in setting
- up the frame (it's OK to skip more, just so long as we don't skip
- anything which might clobber the registers which are being saved.
- Currently we must not skip more on the alpha, but we might need the
- lenient stuff some day. */
-static CORE_ADDR
-alpha_skip_prologue_internal (CORE_ADDR pc, int lenient)
+/* Fallback alpha frame unwinder. Uses instruction scanning and knows
+ something about the traditional layout of alpha stack frames. */
+
+struct alpha_heuristic_unwind_cache
+{
+ CORE_ADDR vfp;
+ CORE_ADDR start_pc;
+ struct trad_frame_saved_reg *saved_regs;
+ int return_reg;
+};
+
+/* If a probing loop sequence starts at PC, simulate it and compute
+ FRAME_SIZE and PC after its execution. Otherwise, return with PC and
+ FRAME_SIZE unchanged. */
+
+static void
+alpha_heuristic_analyze_probing_loop (struct gdbarch *gdbarch, CORE_ADDR *pc,
+ int *frame_size)
{
- unsigned long inst;
- int offset;
- CORE_ADDR post_prologue_pc;
- char buf[4];
+ CORE_ADDR cur_pc = *pc;
+ int cur_frame_size = *frame_size;
+ int nb_of_iterations, reg_index, reg_probe;
+ unsigned int insn;
- /* Silently return the unaltered pc upon memory errors.
- This could happen on OSF/1 if decode_line_1 tries to skip the
- prologue for quickstarted shared library functions when the
- shared library is not yet mapped in.
- 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))
- return pc;
+ /* The following pattern is recognized as a probing loop:
- /* See if we can determine the end of the prologue via the symbol table.
- If so, then return either PC, or the PC after the prologue, whichever
- is greater. */
+ lda REG_INDEX,NB_OF_ITERATIONS
+ lda REG_PROBE,<immediate>(sp)
- post_prologue_pc = after_prologue (pc, NULL);
+ LOOP_START:
+ stq zero,<immediate>(REG_PROBE)
+ subq REG_INDEX,0x1,REG_INDEX
+ lda REG_PROBE,<immediate>(REG_PROBE)
+ bne REG_INDEX, LOOP_START
+
+ lda sp,<immediate>(REG_PROBE)
- if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ If anything different is found, the function returns without
+ changing PC and FRAME_SIZE. Otherwise, PC will point immediately
+ after this sequence, and FRAME_SIZE will be updated. */
- /* Can't determine prologue from the symbol table, need to examine
- instructions. */
+ /* lda REG_INDEX,NB_OF_ITERATIONS */
- /* 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)
- {
- int status;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode)
+ return;
+ reg_index = MEM_RA (insn);
+ nb_of_iterations = MEM_DISP (insn);
- status = read_memory_nobpt (pc + offset, buf, 4);
- if (status)
- memory_error (status, pc + offset);
- inst = extract_unsigned_integer (buf, 4);
+ /* lda REG_PROBE,<immediate>(sp) */
- /* The alpha has no delay slots. But let's keep the lenient stuff,
- we might need it for something else in the future. */
- if (lenient && 0)
- continue;
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RB (insn) != ALPHA_SP_REGNUM)
+ return;
+ reg_probe = MEM_RA (insn);
+ cur_frame_size -= MEM_DISP (insn);
+
+ /* stq zero,<immediate>(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != stq_opcode
+ || MEM_RA (insn) != 0x1f
+ || MEM_RB (insn) != reg_probe)
+ return;
+
+ /* subq REG_INDEX,0x1,REG_INDEX */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != subq_opcode
+ || !OPR_HAS_IMMEDIATE (insn)
+ || OPR_FUNCTION (insn) != subq_function
+ || OPR_LIT(insn) != 1
+ || OPR_RA (insn) != reg_index
+ || OPR_RC (insn) != reg_index)
+ return;
+
+ /* lda REG_PROBE,<immediate>(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RA (insn) != reg_probe
+ || MEM_RB (insn) != reg_probe)
+ return;
+ cur_frame_size -= MEM_DISP (insn) * nb_of_iterations;
- if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
- continue;
- if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
- continue;
- if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- continue;
- if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
- continue;
+ /* bne REG_INDEX, LOOP_START */
- if ((inst & 0xfc1f0000) == 0xb41e0000
- && (inst & 0xffff0000) != 0xb7fe0000)
- continue; /* stq reg,n($sp) */
- /* reg != $zero */
- if ((inst & 0xfc1f0000) == 0x9c1e0000
- && (inst & 0xffff0000) != 0x9ffe0000)
- continue; /* stt reg,n($sp) */
- /* reg != $zero */
- if (inst == 0x47de040f) /* bis sp,sp,fp */
- continue;
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != bne_opcode
+ || MEM_RA (insn) != reg_index)
+ return;
- break;
- }
- return pc + offset;
+ /* lda sp,<immediate>(REG_PROBE) */
+
+ cur_pc += ALPHA_INSN_SIZE;
+ insn = alpha_read_insn (gdbarch, cur_pc);
+ if (INSN_OPCODE (insn) != lda_opcode
+ || MEM_RA (insn) != ALPHA_SP_REGNUM
+ || MEM_RB (insn) != reg_probe)
+ return;
+ cur_frame_size -= MEM_DISP (insn);
+
+ *pc = cur_pc;
+ *frame_size = cur_frame_size;
}
-static CORE_ADDR
-alpha_skip_prologue (CORE_ADDR addr)
+static struct alpha_heuristic_unwind_cache *
+alpha_heuristic_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ CORE_ADDR start_pc)
{
- return (alpha_skip_prologue_internal (addr, 0));
-}
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct alpha_heuristic_unwind_cache *info;
+ ULONGEST val;
+ CORE_ADDR limit_pc, cur_pc;
+ int frame_reg, frame_size, return_reg, reg;
-#if 0
-/* Is address PC in the prologue (loosely defined) for function at
- STARTADDR? */
+ if (*this_prologue_cache)
+ return (struct alpha_heuristic_unwind_cache *) *this_prologue_cache;
-static int
-alpha_in_lenient_prologue (CORE_ADDR startaddr, CORE_ADDR pc)
-{
- CORE_ADDR end_prologue = alpha_skip_prologue_internal (startaddr, 1);
- return pc >= startaddr && pc < end_prologue;
-}
-#endif
-
-/* The alpha needs a conversion between register and memory format if
- the register is a floating point register and
- memory format is float, as the register format must be double
- or
- memory format is an integer with 4 bytes or less, as the representation
- of integers in floating point registers is different. */
-static void
-alpha_register_convert_to_virtual (int regnum, struct type *valtype,
- char *raw_buffer, char *virtual_buffer)
-{
- if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
- {
- memcpy (virtual_buffer, raw_buffer, REGISTER_VIRTUAL_SIZE (regnum));
- return;
- }
+ info = FRAME_OBSTACK_ZALLOC (struct alpha_heuristic_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- double d = extract_floating (raw_buffer, REGISTER_RAW_SIZE (regnum));
- store_floating (virtual_buffer, TYPE_LENGTH (valtype), d);
- }
- else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
- {
- ULONGEST l;
- l = extract_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum));
- l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff);
- store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l);
- }
- else
- error ("Cannot retrieve value from floating point register");
-}
+ limit_pc = get_frame_pc (this_frame);
+ if (start_pc == 0)
+ start_pc = alpha_heuristic_proc_start (gdbarch, limit_pc);
+ info->start_pc = start_pc;
-static void
-alpha_register_convert_to_raw (struct type *valtype, int regnum,
- char *virtual_buffer, char *raw_buffer)
-{
- if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
- {
- memcpy (raw_buffer, virtual_buffer, REGISTER_RAW_SIZE (regnum));
- return;
- }
+ frame_reg = ALPHA_SP_REGNUM;
+ frame_size = 0;
+ return_reg = -1;
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- double d = extract_floating (virtual_buffer, TYPE_LENGTH (valtype));
- store_floating (raw_buffer, REGISTER_RAW_SIZE (regnum), d);
- }
- else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
+ /* If we've identified a likely place to start, do code scanning. */
+ if (start_pc != 0)
{
- ULONGEST l;
- if (TYPE_UNSIGNED (valtype))
- l = extract_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype));
- else
- l = extract_signed_integer (virtual_buffer, TYPE_LENGTH (valtype));
- l = ((l & 0xc0000000) << 32) | ((l & 0x3fffffff) << 29);
- store_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum), l);
+ /* Limit the forward search to 50 instructions. */
+ if (start_pc + 200 < limit_pc)
+ limit_pc = start_pc + 200;
+
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += ALPHA_INSN_SIZE)
+ {
+ unsigned int word = alpha_read_insn (gdbarch, cur_pc);
+
+ if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ {
+ if (word & 0x8000)
+ {
+ /* Consider only the first stack allocation instruction
+ to contain the static size of the frame. */
+ if (frame_size == 0)
+ frame_size = (-word) & 0xffff;
+ }
+ else
+ {
+ /* Exit loop if a positive stack adjustment is found, which
+ usually means that the stack cleanup code in the function
+ epilogue is reached. */
+ break;
+ }
+ }
+ else if ((word & 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */
+ {
+ 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 (trad_frame_addr_p(info->saved_regs, reg))
+ continue;
+
+ if (reg == 31)
+ continue;
+
+ /* Do not compute the address where the register was saved yet,
+ because we don't know yet if the offset will need to be
+ relative to $sp or $fp (we can not compute the address
+ relative to $sp if $sp is updated during the execution of
+ the current subroutine, for instance when doing some alloca).
+ So just store the offset for the moment, and compute the
+ address later when we know whether this frame has a frame
+ pointer or not. */
+ /* Hack: temporarily add one, so that the offset is non-zero
+ and we can tell which registers have save offsets below. */
+ info->saved_regs[reg].addr = (word & 0xffff) + 1;
+
+ /* Starting with OSF/1-3.2C, the system libraries are shipped
+ without local symbols, but they still contain procedure
+ descriptors without a symbol reference. GDB is currently
+ unable to find these procedure descriptors and uses
+ heuristic_proc_desc instead.
+ As some low level compiler support routines (__div*, __add*)
+ use a non-standard return address register, we have to
+ add some heuristics to determine the return address register,
+ or stepping over these routines will fail.
+ Usually the return address register is the first register
+ saved on the stack, but assembler optimization might
+ rearrange the register saves.
+ So we recognize only a few registers (t7, t9, ra) within
+ the procedure prologue as valid return address registers.
+ If we encounter a return instruction, we extract the
+ return address register from it.
+
+ FIXME: Rewriting GDB to access the procedure descriptors,
+ e.g. via the minimal symbol table, might obviate this
+ hack. */
+ if (return_reg == -1
+ && cur_pc < (start_pc + 80)
+ && (reg == ALPHA_T7_REGNUM
+ || reg == ALPHA_T9_REGNUM
+ || reg == ALPHA_RA_REGNUM))
+ return_reg = reg;
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ return_reg = (word >> 16) & 0x1f;
+ else if (word == 0x47de040f) /* bis sp,sp,fp */
+ frame_reg = ALPHA_GCC_FP_REGNUM;
+ else if (word == 0x47fe040f) /* bis zero,sp,fp */
+ frame_reg = ALPHA_GCC_FP_REGNUM;
+
+ alpha_heuristic_analyze_probing_loop (gdbarch, &cur_pc, &frame_size);
+ }
+
+ /* If we haven't found a valid return address register yet, keep
+ searching in the procedure prologue. */
+ if (return_reg == -1)
+ {
+ while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
+ {
+ unsigned int word = alpha_read_insn (gdbarch, cur_pc);
+
+ if ((word & 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */
+ {
+ reg = (word & 0x03e00000) >> 21;
+ if (reg == ALPHA_T7_REGNUM
+ || reg == ALPHA_T9_REGNUM
+ || reg == ALPHA_RA_REGNUM)
+ {
+ return_reg = reg;
+ break;
+ }
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ {
+ return_reg = (word >> 16) & 0x1f;
+ break;
+ }
+
+ cur_pc += ALPHA_INSN_SIZE;
+ }
+ }
}
- else
- error ("Cannot store value in floating point register");
-}
-static const unsigned char *
-alpha_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
-{
- static const unsigned char alpha_breakpoint[] =
- { 0x80, 0, 0, 0 }; /* call_pal bpt */
+ /* Failing that, do default to the customary RA. */
+ if (return_reg == -1)
+ return_reg = ALPHA_RA_REGNUM;
+ info->return_reg = return_reg;
- *lenptr = sizeof(alpha_breakpoint);
- return (alpha_breakpoint);
+ val = get_frame_register_unsigned (this_frame, frame_reg);
+ info->vfp = val + frame_size;
+
+ /* Convert offsets to absolute addresses. See above about adding
+ one to the offsets to make all detected offsets non-zero. */
+ for (reg = 0; reg < ALPHA_NUM_REGS; ++reg)
+ if (trad_frame_addr_p(info->saved_regs, reg))
+ info->saved_regs[reg].addr += val - 1;
+
+ /* The stack pointer of the previous frame is computed by popping
+ the current stack frame. */
+ if (!trad_frame_addr_p (info->saved_regs, ALPHA_SP_REGNUM))
+ trad_frame_set_value (info->saved_regs, ALPHA_SP_REGNUM, info->vfp);
+
+ return info;
}
-/* Given a return value in `regbuf' with a type `valtype',
- extract and copy its value into `valbuf'. */
+/* Given a GDB frame, determine the address of the calling function's
+ frame. This will be used to create a new GDB frame struct. */
static void
-alpha_extract_return_value (struct type *valtype,
- char regbuf[ALPHA_REGISTER_BYTES], char *valbuf)
+alpha_heuristic_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- alpha_register_convert_to_virtual (FP0_REGNUM, valtype,
- regbuf + REGISTER_BYTE (FP0_REGNUM),
- valbuf);
- else
- memcpy (valbuf, regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM),
- TYPE_LENGTH (valtype));
+ struct alpha_heuristic_unwind_cache *info
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
+
+ *this_id = frame_id_build (info->vfp, info->start_pc);
}
-/* Given a return value in `regbuf' with a type `valtype',
- write its value into the appropriate register. */
+/* Retrieve the value of REGNUM in FRAME. Don't give up! */
-static void
-alpha_store_return_value (struct type *valtype, char *valbuf)
+static struct value *
+alpha_heuristic_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
{
- char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
- int regnum = ALPHA_V0_REGNUM;
- int length = TYPE_LENGTH (valtype);
+ struct alpha_heuristic_unwind_cache *info
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
+
+ /* The PC of the previous frame is stored in the link register of
+ the current frame. Frob regnum so that we pull the value from
+ the correct place. */
+ if (regnum == ALPHA_PC_REGNUM)
+ regnum = info->return_reg;
+
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- regnum = FP0_REGNUM;
- length = REGISTER_RAW_SIZE (regnum);
- alpha_register_convert_to_raw (valtype, regnum, valbuf, raw_buffer);
- }
- else
- memcpy (raw_buffer, valbuf, length);
+static const struct frame_unwind alpha_heuristic_frame_unwind = {
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ alpha_heuristic_frame_this_id,
+ alpha_heuristic_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
+
+static CORE_ADDR
+alpha_heuristic_frame_base_address (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct alpha_heuristic_unwind_cache *info
+ = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
- deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, length);
+ return info->vfp;
}
+static const struct frame_base alpha_heuristic_frame_base = {
+ &alpha_heuristic_frame_unwind,
+ alpha_heuristic_frame_base_address,
+ alpha_heuristic_frame_base_address,
+ alpha_heuristic_frame_base_address
+};
+
/* Just like reinit_frame_cache, but with the right arguments to be
- callable as an sfunc. */
+ callable as an sfunc. Used by the "set heuristic-fence-post" command. */
static void
-reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)
+reinit_frame_cache_sfunc (const char *args,
+ int from_tty, struct cmd_list_element *c)
{
reinit_frame_cache ();
}
+\f
+/* Helper routines for alpha*-nat.c files to move register sets to and
+ from core files. The UNIQUE pointer is allowed to be NULL, as most
+ targets don't supply this value in their core files. */
-/* This is the definition of CALL_DUMMY_ADDRESS. It's a heuristic that is used
- to find a convenient place in the text segment to stick a breakpoint to
- detect the completion of a target function call (ala call_function_by_hand).
- */
-
-CORE_ADDR
-alpha_call_dummy_address (void)
+void
+alpha_supply_int_regs (struct regcache *regcache, int regno,
+ const void *r0_r30, const void *pc, const void *unique)
{
- CORE_ADDR entry;
- struct minimal_symbol *sym;
+ const gdb_byte *regs = (const gdb_byte *) r0_r30;
+ int i;
+
+ for (i = 0; i < 31; ++i)
+ if (regno == i || regno == -1)
+ regcache->raw_supply (i, regs + i * 8);
- entry = entry_point_address ();
+ if (regno == ALPHA_ZERO_REGNUM || regno == -1)
+ {
+ const gdb_byte zero[8] = { 0 };
- if (entry != 0)
- return entry;
+ regcache->raw_supply (ALPHA_ZERO_REGNUM, zero);
+ }
- sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile);
+ if (regno == ALPHA_PC_REGNUM || regno == -1)
+ regcache->raw_supply (ALPHA_PC_REGNUM, pc);
- if (!sym || MSYMBOL_TYPE (sym) != mst_text)
- return 0;
- else
- return SYMBOL_VALUE_ADDRESS (sym) + 4;
+ if (regno == ALPHA_UNIQUE_REGNUM || regno == -1)
+ regcache->raw_supply (ALPHA_UNIQUE_REGNUM, unique);
}
-static void
-alpha_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
- struct value **args, struct type *type, int gcc_p)
+void
+alpha_fill_int_regs (const struct regcache *regcache,
+ int regno, void *r0_r30, void *pc, void *unique)
{
- CORE_ADDR bp_address = CALL_DUMMY_ADDRESS ();
+ gdb_byte *regs = (gdb_byte *) r0_r30;
+ int i;
- if (bp_address == 0)
- error ("no place to put call");
- write_register (ALPHA_RA_REGNUM, bp_address);
- write_register (ALPHA_T12_REGNUM, fun);
-}
+ for (i = 0; i < 31; ++i)
+ if (regno == i || regno == -1)
+ regcache->raw_collect (i, regs + i * 8);
-/* On the Alpha, the call dummy code is nevery copied to user space
- (see alpha_fix_call_dummy() above). The contents of this do not
- matter. */
-LONGEST alpha_call_dummy_words[] = { 0 };
+ if (regno == ALPHA_PC_REGNUM || regno == -1)
+ regcache->raw_collect (ALPHA_PC_REGNUM, pc);
-static int
-alpha_use_struct_convention (int gcc_p, struct type *type)
-{
- /* Structures are returned by ref in extra arg0. */
- return 1;
+ if (unique && (regno == ALPHA_UNIQUE_REGNUM || regno == -1))
+ regcache->raw_collect (ALPHA_UNIQUE_REGNUM, unique);
}
-static void
-alpha_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+void
+alpha_supply_fp_regs (struct regcache *regcache, int regno,
+ const void *f0_f30, const void *fpcr)
{
- /* Store the address of the place in which to copy the structure the
- subroutine will return. Handled by alpha_push_arguments. */
+ const gdb_byte *regs = (const gdb_byte *) f0_f30;
+ int i;
+
+ for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
+ if (regno == i || regno == -1)
+ regcache->raw_supply (i, regs + (i - ALPHA_FP0_REGNUM) * 8);
+
+ if (regno == ALPHA_FPCR_REGNUM || regno == -1)
+ regcache->raw_supply (ALPHA_FPCR_REGNUM, fpcr);
}
-static CORE_ADDR
-alpha_extract_struct_value_address (char *regbuf)
+void
+alpha_fill_fp_regs (const struct regcache *regcache,
+ int regno, void *f0_f30, void *fpcr)
{
- return (extract_address (regbuf + REGISTER_BYTE (ALPHA_V0_REGNUM),
- REGISTER_RAW_SIZE (ALPHA_V0_REGNUM)));
+ gdb_byte *regs = (gdb_byte *) f0_f30;
+ int i;
+
+ for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; ++i)
+ if (regno == i || regno == -1)
+ regcache->raw_collect (i, regs + (i - ALPHA_FP0_REGNUM) * 8);
+
+ if (regno == ALPHA_FPCR_REGNUM || regno == -1)
+ regcache->raw_collect (ALPHA_FPCR_REGNUM, fpcr);
}
-/* Figure out where the longjmp will land.
- We expect the first arg to be a pointer to the jmp_buf structure from
- which we extract the PC (JB_PC) that we will land at. The PC is copied
- into the "pc". This routine returns true on success. */
+\f
+/* Return nonzero if the G_floating register value in REG is equal to
+ zero for FP control instructions. */
+
static int
-alpha_get_longjmp_target (CORE_ADDR *pc)
+fp_register_zero_p (LONGEST reg)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- CORE_ADDR jb_addr;
- char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
+ /* Check that all bits except the sign bit are zero. */
+ const LONGEST zero_mask = ((LONGEST) 1 << 63) ^ -1;
- jb_addr = read_register (ALPHA_A0_REGNUM);
+ return ((reg & zero_mask) == 0);
+}
- if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size),
- raw_buffer, tdep->jb_elt_size))
- return 0;
+/* Return the value of the sign bit for the G_floating register
+ value held in REG. */
- *pc = extract_address (raw_buffer, tdep->jb_elt_size);
- return 1;
+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 regcache *regcache, CORE_ADDR pc)
{
+ struct gdbarch *gdbarch = regcache->arch ();
unsigned int insn;
unsigned int op;
+ int regno;
int offset;
LONGEST rav;
- insn = read_memory_unsigned_integer (pc, sizeof (insn));
+ insn = alpha_read_insn (gdbarch, pc);
- /* Opcode is top 6 bits. */
+ /* Opcode is top 6 bits. */
op = (insn >> 26) & 0x3f;
if (op == 0x1a)
{
/* Jump format: target PC is:
RB & ~3 */
- return (read_register ((insn >> 16) & 0x1f) & ~3);
+ return (regcache_raw_get_unsigned (regcache, (insn >> 16) & 0x1f) & ~3);
}
if ((op & 0x30) == 0x30)
{
/* Branch format: target PC is:
(new PC) + (4 * sext(displacement)) */
- if (op == 0x30 || /* BR */
- op == 0x34) /* BSR */
+ if (op == 0x30 /* BR */
+ || op == 0x34) /* BSR */
{
branch_taken:
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 (gdbarch);
+ }
+
+ rav = regcache_raw_get_signed (regcache, regno);
+
switch (op)
{
case 0x38: /* BLBC */
if (rav >= 0)
goto branch_taken;
break;
+
+ /* 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)
+std::vector<CORE_ADDR>
+alpha_software_single_step (struct regcache *regcache)
{
- static CORE_ADDR next_pc;
- typedef char binsn_quantum[BREAKPOINT_MAX];
- static binsn_quantum break_mem;
- CORE_ADDR pc;
+ struct gdbarch *gdbarch = regcache->arch ();
- if (insert_breakpoints_p)
- {
- pc = read_pc ();
- next_pc = alpha_next_pc (pc);
+ CORE_ADDR pc = regcache_read_pc (regcache);
- target_insert_breakpoint (next_pc, break_mem);
- }
- else
- {
- target_remove_breakpoint (next_pc, break_mem);
- write_pc (next_pc);
- }
+ std::vector<CORE_ADDR> next_pcs
+ = alpha_deal_with_atomic_sequence (gdbarch, pc);
+ if (!next_pcs.empty ())
+ return next_pcs;
+
+ CORE_ADDR next_pc = alpha_next_pc (regcache, pc);
+ return {next_pc};
}
\f
-
/* Initialize the current architecture based on INFO. If possible, re-use an
architecture from ARCHES, which is a list of architectures already created
during this debugging session.
struct gdbarch_tdep *tdep;
struct gdbarch *gdbarch;
- /* Try to determine the ABI of the object we are loading. */
- if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN)
- {
- /* If it's an ECOFF file, assume it's OSF/1. */
- if (bfd_get_flavour (info.abfd) == bfd_target_ecoff_flavour)
- info.osabi = GDB_OSABI_OSF1;
- }
-
/* Find a candidate among extant architectures. */
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
- tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ tdep = XCNEW (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
- /* Lowest text address. This is used by heuristic_proc_start() to
- decide when to stop looking. */
- tdep->vm_min_address = (CORE_ADDR) 0x120000000;
+ /* Lowest text address. This is used by heuristic_proc_start()
+ to decide when to stop looking. */
+ tdep->vm_min_address = (CORE_ADDR) 0x120000000LL;
tdep->dynamic_sigtramp_offset = NULL;
- tdep->skip_sigtramp_frame = 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->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_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_wchar_bit (gdbarch, 64);
+ set_gdbarch_wchar_signed (gdbarch, 0);
set_gdbarch_float_bit (gdbarch, 32);
set_gdbarch_double_bit (gdbarch, 64);
set_gdbarch_long_double_bit (gdbarch, 64);
/* Register info */
set_gdbarch_num_regs (gdbarch, ALPHA_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, ALPHA_SP_REGNUM);
- set_gdbarch_fp_regnum (gdbarch, ALPHA_FP_REGNUM);
set_gdbarch_pc_regnum (gdbarch, ALPHA_PC_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, ALPHA_FP0_REGNUM);
set_gdbarch_register_name (gdbarch, alpha_register_name);
- set_gdbarch_register_size (gdbarch, ALPHA_REGISTER_SIZE);
- set_gdbarch_register_bytes (gdbarch, ALPHA_REGISTER_BYTES);
- set_gdbarch_register_byte (gdbarch, alpha_register_byte);
- set_gdbarch_register_raw_size (gdbarch, alpha_register_raw_size);
- set_gdbarch_max_register_raw_size (gdbarch, ALPHA_MAX_REGISTER_RAW_SIZE);
- set_gdbarch_register_virtual_size (gdbarch, alpha_register_virtual_size);
- set_gdbarch_max_register_virtual_size (gdbarch,
- ALPHA_MAX_REGISTER_VIRTUAL_SIZE);
- set_gdbarch_register_virtual_type (gdbarch, alpha_register_virtual_type);
+ set_gdbarch_register_type (gdbarch, alpha_register_type);
set_gdbarch_cannot_fetch_register (gdbarch, alpha_cannot_fetch_register);
set_gdbarch_cannot_store_register (gdbarch, alpha_cannot_store_register);
- set_gdbarch_register_convertible (gdbarch, alpha_register_convertible);
- set_gdbarch_register_convert_to_virtual (gdbarch,
- alpha_register_convert_to_virtual);
- set_gdbarch_register_convert_to_raw (gdbarch, alpha_register_convert_to_raw);
-
- set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue);
-
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- set_gdbarch_frameless_function_invocation (gdbarch,
- generic_frameless_function_invocation_not);
-
- set_gdbarch_saved_pc_after_call (gdbarch, alpha_saved_pc_after_call);
+ set_gdbarch_convert_register_p (gdbarch, alpha_convert_register_p);
+ set_gdbarch_register_to_value (gdbarch, alpha_register_to_value);
+ set_gdbarch_value_to_register (gdbarch, alpha_value_to_register);
- set_gdbarch_frame_chain (gdbarch, alpha_frame_chain);
- set_gdbarch_frame_saved_pc (gdbarch, alpha_frame_saved_pc);
+ set_gdbarch_register_reggroup_p (gdbarch, alpha_register_reggroup_p);
- set_gdbarch_frame_init_saved_regs (gdbarch, alpha_frame_init_saved_regs);
+ /* Prologue heuristics. */
+ set_gdbarch_skip_prologue (gdbarch, alpha_skip_prologue);
- set_gdbarch_use_struct_convention (gdbarch, alpha_use_struct_convention);
- set_gdbarch_deprecated_extract_return_value (gdbarch, alpha_extract_return_value);
+ /* Call info. */
- set_gdbarch_store_struct_return (gdbarch, alpha_store_struct_return);
- set_gdbarch_deprecated_store_return_value (gdbarch, alpha_store_return_value);
- set_gdbarch_deprecated_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_deprecated_use_generic_dummy_frames (gdbarch, 0);
- set_gdbarch_call_dummy_length (gdbarch, 0);
- set_gdbarch_push_arguments (gdbarch, alpha_push_arguments);
- set_gdbarch_pop_frame (gdbarch, alpha_pop_frame);
-
- /* On the Alpha, the call dummy code is never copied to user space,
- stopping the user call is achieved via a bp_call_dummy breakpoint.
- But we need a fake CALL_DUMMY definition to enable the proper
- call_function_by_hand and to avoid zero length array warnings. */
- set_gdbarch_call_dummy_p (gdbarch, 1);
- set_gdbarch_call_dummy_words (gdbarch, alpha_call_dummy_words);
- set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
- set_gdbarch_frame_args_address (gdbarch, alpha_frame_args_address);
- set_gdbarch_frame_locals_address (gdbarch, alpha_frame_locals_address);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, alpha_init_extra_frame_info);
-
- /* Alpha OSF/1 inhibits execution of code on the stack. But there is
- no need for a dummy on the Alpha. PUSH_ARGUMENTS takes care of all
- argument handling and bp_call_dummy takes care of stopping the dummy. */
- set_gdbarch_call_dummy_address (gdbarch, alpha_call_dummy_address);
- set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
- set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
- set_gdbarch_call_dummy_start_offset (gdbarch, 0);
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
- set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
- set_gdbarch_deprecated_push_dummy_frame (gdbarch, alpha_push_dummy_frame);
- set_gdbarch_fix_call_dummy (gdbarch, alpha_fix_call_dummy);
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_noop);
- set_gdbarch_deprecated_init_frame_pc_first (gdbarch, alpha_init_frame_pc_first);
+ set_gdbarch_push_dummy_call (gdbarch, alpha_push_dummy_call);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
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_breakpoint_kind_from_pc (gdbarch,
+ alpha_breakpoint::kind_from_pc);
+ set_gdbarch_sw_breakpoint_from_kind (gdbarch,
+ alpha_breakpoint::bp_from_kind);
+ set_gdbarch_decr_pc_after_break (gdbarch, ALPHA_INSN_SIZE);
+ set_gdbarch_cannot_step_breakpoint (gdbarch, 1);
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_frame_args_skip (gdbarch, 0);
+ /* Handles single stepping of atomic sequences. */
+ set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
/* 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_unwinder (gdbarch, &alpha_sigtramp_frame_unwind);
+ frame_unwind_append_unwinder (gdbarch, &alpha_heuristic_frame_unwind);
+
+ frame_base_set_default (gdbarch, &alpha_heuristic_frame_base);
+
return gdbarch;
}
-static void
-alpha_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+void
+alpha_dwarf2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- if (tdep == NULL)
- return;
-
- fprintf_unfiltered (file,
- "alpha_dump_tdep: vm_min_address = 0x%lx\n",
- (long) tdep->vm_min_address);
-
- fprintf_unfiltered (file,
- "alpha_dump_tdep: jb_pc = %d\n",
- tdep->jb_pc);
- fprintf_unfiltered (file,
- "alpha_dump_tdep: jb_elt_size = %ld\n",
- (long) tdep->jb_elt_size);
+ dwarf2_append_unwinders (gdbarch);
+ frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
}
void
_initialize_alpha_tdep (void)
{
- struct cmd_list_element *c;
-
- gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, alpha_dump_tdep);
- tm_print_insn = print_insn_alpha;
+ gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL);
/* Let the user set the fence post for heuristic_proc_start. */
/* 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