/* Frame unwinder for frames with DWARF Call Frame Information.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
Contributed by Mark Kettenis.
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 "dwarf2expr.h"
#include "symtab.h"
#include "objfiles.h"
#include "regcache.h"
+#include "value.h"
#include "gdb_assert.h"
#include "gdb_string.h"
ULONGEST return_address_register;
/* Instruction sequence to initialize a register set. */
- unsigned char *initial_instructions;
- unsigned char *end;
+ gdb_byte *initial_instructions;
+ gdb_byte *end;
+
+ /* Saved augmentation, in case it's needed later. */
+ char *augmentation;
/* Encoding of addresses. */
- unsigned char encoding;
+ gdb_byte encoding;
/* True if a 'z' augmentation existed. */
unsigned char saw_z_augmentation;
+ /* True if an 'S' augmentation existed. */
+ unsigned char signal_frame;
+
+ /* The version recorded in the CIE. */
+ unsigned char version;
+
struct dwarf2_cie *next;
};
CORE_ADDR address_range;
/* Instruction sequence. */
- unsigned char *instructions;
- unsigned char *end;
+ gdb_byte *instructions;
+ gdb_byte *end;
+
+ /* True if this FDE is read from a .eh_frame instead of a .debug_frame
+ section. */
+ unsigned char eh_frame_p;
struct dwarf2_fde *next;
};
static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc);
+
+static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum,
+ int eh_frame_p);
\f
/* Structure describing a frame state. */
-enum dwarf2_reg_rule
-{
- /* Make certain that 0 maps onto the correct enum value - the
- corresponding structure is being initialized using memset zero.
- This indicates that CFI didn't provide any information at all
- about a register - leaving how to obtain it's value totally
- unspecified. */
- REG_UNSPECIFIED = 0,
- /* The term "undefined" comes from the DWARF2 CFI spec which this
- code is moddeling - it indicates that the register's value is
- "undefined". */
- /* NOTE: cagney/2003-09-08: GCC uses the less formal term "unsaved"
- - it's definition is a combination of REG_UNDEFINED and
- REG_UNSPECIFIED - the failure to differentiate the two helps
- explain a few problems with the CFI GCC outputs. */
- REG_UNDEFINED,
- REG_SAVED_OFFSET,
- REG_SAVED_REG,
- REG_SAVED_EXP,
- REG_SAME_VALUE
-};
-
struct dwarf2_frame_state
{
/* Each register save state can be described in terms of a CFA slot,
another register, or a location expression. */
struct dwarf2_frame_state_reg_info
{
- struct dwarf2_frame_state_reg
- {
- union {
- LONGEST offset;
- ULONGEST reg;
- unsigned char *exp;
- } loc;
- ULONGEST exp_len;
- enum dwarf2_reg_rule how;
- } *reg;
+ struct dwarf2_frame_state_reg *reg;
int num_regs;
/* Used to implement DW_CFA_remember_state. */
LONGEST cfa_offset;
ULONGEST cfa_reg;
- unsigned char *cfa_exp;
+ gdb_byte *cfa_exp;
enum {
CFA_UNSET,
CFA_REG_OFFSET,
LONGEST data_align;
ULONGEST code_align;
ULONGEST retaddr_column;
+
+ /* Flags for known producer quirks. */
+
+ /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa
+ and DW_CFA_def_cfa_offset takes a factored offset. */
+ int armcc_cfa_offsets_sf;
+
+ /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that
+ the CFA is defined as REG - OFFSET rather than REG + OFFSET. */
+ int armcc_cfa_offsets_reversed;
};
/* Store the length the expression for the CFA in the `cfa_reg' field,
which is unused in that case. */
#define cfa_exp_len cfa_reg
-/* Assert that the register set RS is large enough to store NUM_REGS
+/* Assert that the register set RS is large enough to store gdbarch_num_regs
columns. If necessary, enlarge the register set. */
static void
static struct dwarf2_frame_state_reg *
dwarf2_frame_state_copy_regs (struct dwarf2_frame_state_reg_info *rs)
{
- size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg_info);
+ size_t size = rs->num_regs * sizeof (struct dwarf2_frame_state_reg);
struct dwarf2_frame_state_reg *reg;
reg = (struct dwarf2_frame_state_reg *) xmalloc (size);
read_reg (void *baton, int reg)
{
struct frame_info *next_frame = (struct frame_info *) baton;
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
int regnum;
- char *buf;
+ gdb_byte *buf;
- regnum = DWARF2_REG_TO_REGNUM (reg);
+ regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
- buf = (char *) alloca (register_size (current_gdbarch, regnum));
+ buf = alloca (register_size (gdbarch, regnum));
frame_unwind_register (next_frame, regnum, buf);
- return extract_typed_address (buf, builtin_type_void_data_ptr);
+
+ /* Convert the register to an integer. This returns a LONGEST
+ rather than a CORE_ADDR, but unpack_pointer does the same thing
+ under the covers, and this makes more sense for non-pointer
+ registers. Maybe read_reg and the associated interfaces should
+ deal with "struct value" instead of CORE_ADDR. */
+ return unpack_long (register_type (gdbarch, regnum), buf);
}
static void
-read_mem (void *baton, char *buf, CORE_ADDR addr, size_t len)
+read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len)
{
read_memory (addr, buf, len);
}
static void
-no_get_frame_base (void *baton, unsigned char **start, size_t *length)
+no_get_frame_base (void *baton, gdb_byte **start, size_t *length)
{
internal_error (__FILE__, __LINE__,
- "Support for DW_OP_fbreg is unimplemented");
+ _("Support for DW_OP_fbreg is unimplemented"));
}
static CORE_ADDR
no_get_tls_address (void *baton, CORE_ADDR offset)
{
internal_error (__FILE__, __LINE__,
- "Support for DW_OP_GNU_push_tls_address is unimplemented");
+ _("Support for DW_OP_GNU_push_tls_address is unimplemented"));
+}
+
+/* Execute the required actions for both the DW_CFA_restore and
+DW_CFA_restore_extended instructions. */
+static void
+dwarf2_restore_rule (struct gdbarch *gdbarch, ULONGEST reg_num,
+ struct dwarf2_frame_state *fs, int eh_frame_p)
+{
+ ULONGEST reg;
+
+ gdb_assert (fs->initial.reg);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p);
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+
+ /* Check if this register was explicitly initialized in the
+ CIE initial instructions. If not, default the rule to
+ UNSPECIFIED. */
+ if (reg < fs->initial.num_regs)
+ fs->regs.reg[reg] = fs->initial.reg[reg];
+ else
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED;
+
+ if (fs->regs.reg[reg].how == DWARF2_FRAME_REG_UNSPECIFIED)
+ complaint (&symfile_complaints, _("\
+incomplete CFI data; DW_CFA_restore unspecified\n\
+register %s (#%d) at 0x%s"),
+ gdbarch_register_name
+ (gdbarch, gdbarch_dwarf2_reg_to_regnum (gdbarch, reg)),
+ gdbarch_dwarf2_reg_to_regnum (gdbarch, reg),
+ paddr (fs->pc));
}
static CORE_ADDR
-execute_stack_op (unsigned char *exp, ULONGEST len,
+execute_stack_op (gdb_byte *exp, ULONGEST len,
struct frame_info *next_frame, CORE_ADDR initial)
{
struct dwarf_expr_context *ctx;
\f
static void
-execute_cfa_program (unsigned char *insn_ptr, unsigned char *insn_end,
+execute_cfa_program (gdb_byte *insn_ptr, gdb_byte *insn_end,
struct frame_info *next_frame,
- struct dwarf2_frame_state *fs)
+ struct dwarf2_frame_state *fs, int eh_frame_p)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
int bytes_read;
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
while (insn_ptr < insn_end && fs->pc <= pc)
{
- unsigned char insn = *insn_ptr++;
+ gdb_byte insn = *insn_ptr++;
ULONGEST utmp, reg;
LONGEST offset;
else if ((insn & 0xc0) == DW_CFA_offset)
{
reg = insn & 0x3f;
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
offset = utmp * fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
}
else if ((insn & 0xc0) == DW_CFA_restore)
{
- gdb_assert (fs->initial.reg);
reg = insn & 0x3f;
- dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg] = fs->initial.reg[reg];
+ dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p);
}
else
{
case DW_CFA_offset_extended:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
offset = utmp * fs->data_align;
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
break;
case DW_CFA_restore_extended:
- gdb_assert (fs->initial.reg);
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
- dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg] = fs->initial.reg[reg];
+ dwarf2_restore_rule (gdbarch, reg, fs, eh_frame_p);
break;
case DW_CFA_undefined:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_UNDEFINED;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNDEFINED;
break;
case DW_CFA_same_value:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_SAME_VALUE;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAME_VALUE;
break;
case DW_CFA_register:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
+ utmp = dwarf2_frame_adjust_regnum (gdbarch, utmp, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG;
fs->regs.reg[reg].loc.reg = utmp;
break;
{
struct dwarf2_frame_state_reg_info *old_rs = fs->regs.prev;
- gdb_assert (old_rs);
-
- xfree (fs->regs.reg);
- fs->regs = *old_rs;
- xfree (old_rs);
+ if (old_rs == NULL)
+ {
+ complaint (&symfile_complaints, _("\
+bad CFI data; mismatched DW_CFA_restore_state at 0x%s"), paddr (fs->pc));
+ }
+ else
+ {
+ xfree (fs->regs.reg);
+ fs->regs = *old_rs;
+ xfree (old_rs);
+ }
}
break;
case DW_CFA_def_cfa:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
+
+ if (fs->armcc_cfa_offsets_sf)
+ utmp *= fs->data_align;
+
fs->cfa_offset = utmp;
fs->cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_register:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
+ eh_frame_p);
fs->cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_offset:
- insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_offset);
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
+
+ if (fs->armcc_cfa_offsets_sf)
+ utmp *= fs->data_align;
+
+ fs->cfa_offset = utmp;
/* cfa_how deliberately not set. */
break;
+ case DW_CFA_nop:
+ break;
+
case DW_CFA_def_cfa_expression:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_exp_len);
fs->cfa_exp = insn_ptr;
case DW_CFA_expression:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
fs->regs.reg[reg].loc.exp = insn_ptr;
fs->regs.reg[reg].exp_len = utmp;
- fs->regs.reg[reg].how = REG_SAVED_EXP;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_EXP;
insn_ptr += utmp;
break;
- case DW_CFA_nop:
+ case DW_CFA_offset_extended_sf:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ offset *= fs->data_align;
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ break;
+
+ case DW_CFA_val_offset:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
+ offset = utmp * fs->data_align;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ break;
+
+ case DW_CFA_val_offset_sf:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ offset *= fs->data_align;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ break;
+
+ case DW_CFA_val_expression:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
+ fs->regs.reg[reg].loc.exp = insn_ptr;
+ fs->regs.reg[reg].exp_len = utmp;
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP;
+ insn_ptr += utmp;
+ break;
+
+ case DW_CFA_def_cfa_sf:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
+ fs->cfa_reg = dwarf2_frame_adjust_regnum (gdbarch, fs->cfa_reg,
+ eh_frame_p);
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ fs->cfa_offset = offset * fs->data_align;
+ fs->cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_offset_sf:
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ fs->cfa_offset = offset * fs->data_align;
+ /* cfa_how deliberately not set. */
+ break;
+
+ case DW_CFA_GNU_window_save:
+ /* This is SPARC-specific code, and contains hard-coded
+ constants for the register numbering scheme used by
+ GCC. Rather than having a architecture-specific
+ operation that's only ever used by a single
+ architecture, we provide the implementation here.
+ Incidentally that's what GCC does too in its
+ unwinder. */
+ {
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ int size = register_size(gdbarch, 0);
+ dwarf2_frame_state_alloc_regs (&fs->regs, 32);
+ for (reg = 8; reg < 16; reg++)
+ {
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_REG;
+ fs->regs.reg[reg].loc.reg = reg + 16;
+ }
+ for (reg = 16; reg < 32; reg++)
+ {
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = (reg - 16) * size;
+ }
+ }
break;
case DW_CFA_GNU_args_size:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
break;
+ case DW_CFA_GNU_negative_offset_extended:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ reg = dwarf2_frame_adjust_regnum (gdbarch, reg, eh_frame_p);
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &offset);
+ offset *= fs->data_align;
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = -offset;
+ break;
+
default:
- internal_error (__FILE__, __LINE__, "Unknown CFI encountered.");
+ internal_error (__FILE__, __LINE__, _("Unknown CFI encountered."));
}
}
}
dwarf2_frame_state_free_regs (fs->regs.prev);
fs->regs.prev = NULL;
}
+\f
+
+/* Architecture-specific operations. */
+
+/* Per-architecture data key. */
+static struct gdbarch_data *dwarf2_frame_data;
+
+struct dwarf2_frame_ops
+{
+ /* Pre-initialize the register state REG for register REGNUM. */
+ void (*init_reg) (struct gdbarch *, int, struct dwarf2_frame_state_reg *,
+ struct frame_info *);
+
+ /* Check whether the frame preceding NEXT_FRAME will be a signal
+ trampoline. */
+ int (*signal_frame_p) (struct gdbarch *, struct frame_info *);
+
+ /* Convert .eh_frame register number to DWARF register number, or
+ adjust .debug_frame register number. */
+ int (*adjust_regnum) (struct gdbarch *, int, int);
+};
+
+/* Default architecture-specific register state initialization
+ function. */
+
+static void
+dwarf2_frame_default_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *next_frame)
+{
+ /* If we have a register that acts as a program counter, mark it as
+ a destination for the return address. If we have a register that
+ serves as the stack pointer, arrange for it to be filled with the
+ call frame address (CFA). The other registers are marked as
+ unspecified.
+
+ We copy the return address to the program counter, since many
+ parts in GDB assume that it is possible to get the return address
+ by unwinding the program counter register. However, on ISA's
+ with a dedicated return address register, the CFI usually only
+ contains information to unwind that return address register.
+
+ The reason we're treating the stack pointer special here is
+ because in many cases GCC doesn't emit CFI for the stack pointer
+ and implicitly assumes that it is equal to the CFA. This makes
+ some sense since the DWARF specification (version 3, draft 8,
+ p. 102) says that:
+
+ "Typically, the CFA is defined to be the value of the stack
+ pointer at the call site in the previous frame (which may be
+ different from its value on entry to the current frame)."
+
+ However, this isn't true for all platforms supported by GCC
+ (e.g. IBM S/390 and zSeries). Those architectures should provide
+ their own architecture-specific initialization function. */
+
+ if (regnum == gdbarch_pc_regnum (gdbarch))
+ reg->how = DWARF2_FRAME_REG_RA;
+ else if (regnum == gdbarch_sp_regnum (gdbarch))
+ reg->how = DWARF2_FRAME_REG_CFA;
+}
+
+/* Return a default for the architecture-specific operations. */
+
+static void *
+dwarf2_frame_init (struct obstack *obstack)
+{
+ struct dwarf2_frame_ops *ops;
+
+ ops = OBSTACK_ZALLOC (obstack, struct dwarf2_frame_ops);
+ ops->init_reg = dwarf2_frame_default_init_reg;
+ return ops;
+}
+
+/* Set the architecture-specific register state initialization
+ function for GDBARCH to INIT_REG. */
+
+void
+dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,
+ void (*init_reg) (struct gdbarch *, int,
+ struct dwarf2_frame_state_reg *,
+ struct frame_info *))
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ ops->init_reg = init_reg;
+}
+
+/* Pre-initialize the register state REG for register REGNUM. */
+
+static void
+dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *next_frame)
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ ops->init_reg (gdbarch, regnum, reg, next_frame);
+}
+
+/* Set the architecture-specific signal trampoline recognition
+ function for GDBARCH to SIGNAL_FRAME_P. */
+
+void
+dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
+ int (*signal_frame_p) (struct gdbarch *,
+ struct frame_info *))
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ ops->signal_frame_p = signal_frame_p;
+}
+
+/* Query the architecture-specific signal frame recognizer for
+ NEXT_FRAME. */
+
+static int
+dwarf2_frame_signal_frame_p (struct gdbarch *gdbarch,
+ struct frame_info *next_frame)
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ if (ops->signal_frame_p == NULL)
+ return 0;
+ return ops->signal_frame_p (gdbarch, next_frame);
+}
+
+/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
+ register numbers. */
+
+void
+dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
+ int (*adjust_regnum) (struct gdbarch *,
+ int, int))
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ ops->adjust_regnum = adjust_regnum;
+}
+
+/* Translate a .eh_frame register to DWARF register, or adjust a .debug_frame
+ register. */
+
+static int
+dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum, int eh_frame_p)
+{
+ struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
+
+ if (ops->adjust_regnum == NULL)
+ return regnum;
+ return ops->adjust_regnum (gdbarch, regnum, eh_frame_p);
+}
+
+static void
+dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs,
+ struct dwarf2_fde *fde)
+{
+ static const char *arm_idents[] = {
+ "ARM C Compiler, ADS",
+ "Thumb C Compiler, ADS",
+ "ARM C++ Compiler, ADS",
+ "Thumb C++ Compiler, ADS",
+ "ARM/Thumb C/C++ Compiler, RVCT"
+ };
+ int i;
+
+ struct symtab *s;
+
+ s = find_pc_symtab (fs->pc);
+ if (s == NULL || s->producer == NULL)
+ return;
+
+ for (i = 0; i < ARRAY_SIZE (arm_idents); i++)
+ if (strncmp (s->producer, arm_idents[i], strlen (arm_idents[i])) == 0)
+ {
+ if (fde->cie->version == 1)
+ fs->armcc_cfa_offsets_sf = 1;
+
+ if (fde->cie->version == 1)
+ fs->armcc_cfa_offsets_reversed = 1;
+
+ /* The reversed offset problem is present in some compilers
+ using DWARF3, but it was eventually fixed. Check the ARM
+ defined augmentations, which are in the format "armcc" followed
+ by a list of one-character options. The "+" option means
+ this problem is fixed (no quirk needed). If the armcc
+ augmentation is missing, the quirk is needed. */
+ if (fde->cie->version == 3
+ && (strncmp (fde->cie->augmentation, "armcc", 5) != 0
+ || strchr (fde->cie->augmentation + 5, '+') == NULL))
+ fs->armcc_cfa_offsets_reversed = 1;
+
+ return;
+ }
+}
+\f
struct dwarf2_frame_cache
{
/* DWARF Call Frame Address. */
CORE_ADDR cfa;
+ /* Set if the return address column was marked as undefined. */
+ int undefined_retaddr;
+
/* Saved registers, indexed by GDB register number, not by DWARF
register number. */
struct dwarf2_frame_state_reg *reg;
+
+ /* Return address register. */
+ struct dwarf2_frame_state_reg retaddr_reg;
};
static struct dwarf2_frame_cache *
dwarf2_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct cleanup *old_chain;
- const int num_regs = NUM_REGS + NUM_PSEUDO_REGS;
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ const int num_regs = gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch);
struct dwarf2_frame_cache *cache;
struct dwarf2_frame_state *fs;
struct dwarf2_fde *fde;
to abort), the compiler might optimize away the instruction at
NEXT_FRAME's return address. As a result the return address will
point at some random instruction, and the CFI for that
- instruction is probably wortless to us. GCC's unwinder solves
+ instruction is probably worthless to us. GCC's unwinder solves
this problem by substracting 1 from the return address to get an
address in the middle of a presumed call instruction (or the
instruction in the associated delay slot). This should only be
done for "normal" frames and not for resume-type frames (signal
- handlers, sentinel frames, dummy frames).
-
- frame_unwind_address_in_block does just this.
-
- It's not clear how reliable the method is though - there is the
- potential for the register state pre-call being different to that
- on return. */
- fs->pc = frame_unwind_address_in_block (next_frame);
+ handlers, sentinel frames, dummy frames). The function
+ frame_unwind_address_in_block does just this. It's not clear how
+ reliable the method is though; there is the potential for the
+ register state pre-call being different to that on return. */
+ fs->pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
/* Find the correct FDE. */
fde = dwarf2_frame_find_fde (&fs->pc);
fs->code_align = fde->cie->code_alignment_factor;
fs->retaddr_column = fde->cie->return_address_register;
+ /* Check for "quirks" - known bugs in producers. */
+ dwarf2_frame_find_quirks (fs, fde);
+
/* First decode all the insns in the CIE. */
execute_cfa_program (fde->cie->initial_instructions,
- fde->cie->end, next_frame, fs);
+ fde->cie->end, next_frame, fs, fde->eh_frame_p);
/* Save the initialized register set. */
fs->initial = fs->regs;
fs->initial.reg = dwarf2_frame_state_copy_regs (&fs->regs);
/* Then decode the insns in the FDE up to our target PC. */
- execute_cfa_program (fde->instructions, fde->end, next_frame, fs);
+ execute_cfa_program (fde->instructions, fde->end, next_frame, fs,
+ fde->eh_frame_p);
/* Caclulate the CFA. */
switch (fs->cfa_how)
{
case CFA_REG_OFFSET:
cache->cfa = read_reg (next_frame, fs->cfa_reg);
- cache->cfa += fs->cfa_offset;
+ if (fs->armcc_cfa_offsets_reversed)
+ cache->cfa -= fs->cfa_offset;
+ else
+ cache->cfa += fs->cfa_offset;
break;
case CFA_EXP:
break;
default:
- internal_error (__FILE__, __LINE__, "Unknown CFA rule.");
+ internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
}
- /* Initialize things so that all registers are marked as
- unspecified. */
+ /* Initialize the register state. */
{
int regnum;
+
for (regnum = 0; regnum < num_regs; regnum++)
- cache->reg[regnum].how = REG_UNSPECIFIED;
+ dwarf2_frame_init_reg (gdbarch, regnum, &cache->reg[regnum], next_frame);
}
/* Go through the DWARF2 CFI generated table and save its register
- location information in the cache. */
+ location information in the cache. Note that we don't skip the
+ return address column; it's perfectly all right for it to
+ correspond to a real register. If it doesn't correspond to a
+ real register, or if we shouldn't treat it as such,
+ gdbarch_dwarf2_reg_to_regnum should be defined to return a number outside
+ the range [0, gdbarch_num_regs). */
{
int column; /* CFI speak for "register number". */
+
for (column = 0; column < fs->regs.num_regs; column++)
{
- int regnum;
-
- /* Skip the return address column. */
- if (column == fs->retaddr_column)
- /* NOTE: cagney/2003-06-07: Is this right? What if
- RETADDR_COLUMN corresponds to a real register (and,
- worse, that isn't the PC_REGNUM)? I'm guessing that the
- PC_REGNUM further down is trying to handle this. That
- can't be right though - PC_REGNUM may not be valid (it
- can be -ve). I think, instead when RETADDR_COLUM isn't a
- real register, it should map itself onto frame_pc_unwind. */
- continue;
-
/* Use the GDB register number as the destination index. */
- regnum = DWARF2_REG_TO_REGNUM (column);
+ int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, column);
/* If there's no corresponding GDB register, ignore it. */
if (regnum < 0 || regnum >= num_regs)
continue;
/* NOTE: cagney/2003-09-05: CFI should specify the disposition
- of all debug info registers. If it doesn't complain (but
- not too loudly). It turns out that GCC, assumes that an
+ of all debug info registers. If it doesn't, complain (but
+ not too loudly). It turns out that GCC assumes that an
unspecified register implies "same value" when CFI (draft
7) specifies nothing at all. Such a register could equally
be interpreted as "undefined". Also note that this check
- isn't sufficient - it only checks that all registers in the
- range [0 .. max column] are specified - and won't detect
+ isn't sufficient; it only checks that all registers in the
+ range [0 .. max column] are specified, and won't detect
problems when a debug info register falls outside of the
- table. Need a way of iterating through all the valid
+ table. We need a way of iterating through all the valid
DWARF2 register numbers. */
- if (fs->regs.reg[column].how == REG_UNSPECIFIED)
- complaint (&symfile_complaints,
- "Incomplete CFI data; unspecified registers at 0x%s",
- paddr (fs->pc));
+ if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED)
+ {
+ if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED)
+ complaint (&symfile_complaints, _("\
+incomplete CFI data; unspecified registers (e.g., %s) at 0x%s"),
+ gdbarch_register_name (gdbarch, regnum),
+ paddr_nz (fs->pc));
+ }
+ else
+ cache->reg[regnum] = fs->regs.reg[column];
+ }
+ }
- cache->reg[regnum] = fs->regs.reg[column];
+ /* Eliminate any DWARF2_FRAME_REG_RA rules, and save the information
+ we need for evaluating DWARF2_FRAME_REG_RA_OFFSET rules. */
+ {
+ int regnum;
+
+ for (regnum = 0; regnum < num_regs; regnum++)
+ {
+ if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA
+ || cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET)
+ {
+ struct dwarf2_frame_state_reg *retaddr_reg =
+ &fs->regs.reg[fs->retaddr_column];
+
+ /* It seems rather bizarre to specify an "empty" column as
+ the return adress column. However, this is exactly
+ what GCC does on some targets. It turns out that GCC
+ assumes that the return address can be found in the
+ register corresponding to the return address column.
+ Incidentally, that's how we should treat a return
+ address column specifying "same value" too. */
+ if (fs->retaddr_column < fs->regs.num_regs
+ && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED
+ && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE)
+ {
+ if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA)
+ cache->reg[regnum] = *retaddr_reg;
+ else
+ cache->retaddr_reg = *retaddr_reg;
+ }
+ else
+ {
+ if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA)
+ {
+ cache->reg[regnum].loc.reg = fs->retaddr_column;
+ cache->reg[regnum].how = DWARF2_FRAME_REG_SAVED_REG;
+ }
+ else
+ {
+ cache->retaddr_reg.loc.reg = fs->retaddr_column;
+ cache->retaddr_reg.how = DWARF2_FRAME_REG_SAVED_REG;
+ }
+ }
+ }
}
}
- /* Store the location of the return addess. If the return address
- column (adjusted) is not the same as gdb's PC_REGNUM, then this
- implies a copy from the ra column register. */
if (fs->retaddr_column < fs->regs.num_regs
- && fs->regs.reg[fs->retaddr_column].how != REG_UNDEFINED)
- {
- /* See comment above about a possibly -ve PC_REGNUM. If this
- assertion fails, it's a problem with this code and not the
- architecture. */
- gdb_assert (PC_REGNUM >= 0);
- cache->reg[PC_REGNUM] = fs->regs.reg[fs->retaddr_column];
- }
- else
- {
- int reg = DWARF2_REG_TO_REGNUM (fs->retaddr_column);
- if (reg != PC_REGNUM)
- {
- /* See comment above about PC_REGNUM being -ve. If this
- assertion fails, it's a problem with this code and not
- the architecture. */
- gdb_assert (PC_REGNUM >= 0);
- cache->reg[PC_REGNUM].loc.reg = reg;
- cache->reg[PC_REGNUM].how = REG_SAVED_REG;
- }
- }
+ && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED)
+ cache->undefined_retaddr = 1;
do_cleanups (old_chain);
struct dwarf2_frame_cache *cache =
dwarf2_frame_cache (next_frame, this_cache);
- (*this_id) = frame_id_build (cache->cfa, frame_func_unwind (next_frame));
+ if (cache->undefined_retaddr)
+ return;
+
+ (*this_id) = frame_id_build (cache->cfa,
+ frame_func_unwind (next_frame, NORMAL_FRAME));
+}
+
+static void
+dwarf2_signal_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct dwarf2_frame_cache *cache =
+ dwarf2_frame_cache (next_frame, this_cache);
+
+ if (cache->undefined_retaddr)
+ return;
+
+ (*this_id) = frame_id_build (cache->cfa,
+ frame_func_unwind (next_frame, SIGTRAMP_FRAME));
}
static void
dwarf2_frame_prev_register (struct frame_info *next_frame, void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int *realnump, gdb_byte *valuep)
{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct dwarf2_frame_cache *cache =
dwarf2_frame_cache (next_frame, this_cache);
switch (cache->reg[regnum].how)
{
- case REG_UNDEFINED:
+ case DWARF2_FRAME_REG_UNDEFINED:
/* If CFI explicitly specified that the value isn't defined,
- mark it as optimized away - the value isn't available. */
+ mark it as optimized away; the value isn't available. */
*optimizedp = 1;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
- if (regnum == SP_REGNUM)
- {
- /* GCC defines the CFA as the value of the stack pointer
- just before the call instruction is executed. Do other
- compilers use the same definition? */
- /* DWARF V3 Draft 7 p102: Typically, the CFA is defined to
- be the value of the stack pointer at the call site in the
- previous frame (which may be different from its value on
- entry to the current frame). */
- /* DWARF V3 Draft 7 p103: The first column of the rules
- defines the rule which computes the CFA value; it may be
- either a register and a signed offset that are added
- together or a DWARF expression that is evaluated. */
- /* FIXME: cagney/2003-07-07: I don't understand this. The
- CFI info should have provided unwind information for the
- SP register and then pointed ->cfa_reg at it, not the
- reverse. Assuming that SP_REGNUM is !-ve, there is a
- very real posibility that CFA is an offset from some
- other register, having nothing to do with the unwound SP
- value. */
- /* FIXME: cagney/2003-09-05: I think I understand. GDB was
- lumping the two states "unspecified" and "undefined"
- together. Here SP_REGNUM was "unspecified", GCC assuming
- that in such a case CFA would be used. This branch of
- the if statement should be deleted - the problem of
- SP_REGNUM is now handed by the case REG_UNSPECIFIED
- below. */
- *optimizedp = 0;
- if (valuep)
- {
- /* Store the value. */
- store_typed_address (valuep, builtin_type_void_data_ptr,
- cache->cfa);
- }
- }
- else if (valuep)
+ if (valuep)
{
/* In some cases, for example %eflags on the i386, we have
to provide a sane value, even though this register wasn't
}
break;
- case REG_SAVED_OFFSET:
+ case DWARF2_FRAME_REG_SAVED_OFFSET:
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = cache->cfa + cache->reg[regnum].loc.offset;
if (valuep)
{
/* Read the value in from memory. */
- read_memory (*addrp, valuep,
- register_size (current_gdbarch, regnum));
+ read_memory (*addrp, valuep, register_size (gdbarch, regnum));
}
break;
- case REG_SAVED_REG:
- regnum = DWARF2_REG_TO_REGNUM (cache->reg[regnum].loc.reg);
- frame_register_unwind (next_frame, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ case DWARF2_FRAME_REG_SAVED_REG:
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realnump = gdbarch_dwarf2_reg_to_regnum
+ (gdbarch, cache->reg[regnum].loc.reg);
+ if (valuep)
+ frame_unwind_register (next_frame, (*realnump), valuep);
break;
- case REG_SAVED_EXP:
+ case DWARF2_FRAME_REG_SAVED_EXP:
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = execute_stack_op (cache->reg[regnum].loc.exp,
if (valuep)
{
/* Read the value in from memory. */
- read_memory (*addrp, valuep,
- register_size (current_gdbarch, regnum));
+ read_memory (*addrp, valuep, register_size (gdbarch, regnum));
}
break;
- case REG_UNSPECIFIED:
+ case DWARF2_FRAME_REG_SAVED_VAL_OFFSET:
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ store_unsigned_integer (valuep, register_size (gdbarch, regnum),
+ cache->cfa + cache->reg[regnum].loc.offset);
+ break;
+
+ case DWARF2_FRAME_REG_SAVED_VAL_EXP:
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ store_unsigned_integer (valuep, register_size (gdbarch, regnum),
+ execute_stack_op (cache->reg[regnum].loc.exp,
+ cache->reg[regnum].exp_len,
+ next_frame, cache->cfa));
+ break;
+
+ case DWARF2_FRAME_REG_UNSPECIFIED:
/* GCC, in its infinite wisdom decided to not provide unwind
information for registers that are "same value". Since
DWARF2 (3 draft 7) doesn't define such behavior, said
"undefined"). Code above issues a complaint about this.
Here just fudge the books, assume GCC, and that the value is
more inner on the stack. */
- if (SP_REGNUM >= 0 && regnum == SP_REGNUM)
- {
- /* Can things get worse? Yep! One of the registers GCC
- forgot to provide unwind information for was the stack
- pointer. Outch! GCC appears to assumes that the CFA
- address can be used - after all it points to the inner
- most address of the previous frame before the function
- call and that's always the same as the stack pointer on
- return, right? Wrong. See GCC's i386 STDCALL option for
- an ABI that has a different entry and return stack
- pointer. */
- /* DWARF V3 Draft 7 p102: Typically, the CFA is defined to
- be the value of the stack pointer at the call site in the
- previous frame (which may be different from its value on
- entry to the current frame). */
- /* DWARF V3 Draft 7 p103: The first column of the rules
- defines the rule which computes the CFA value; it may be
- either a register and a signed offset that are added
- together or a DWARF expression that is evaluated. */
- /* NOTE: cagney/2003-09-05: Should issue a complain.
- Unfortunatly it turns out that DWARF2 CFI has a problem.
- Since CFI specifies the location at which a register was
- saved (not its value) it isn't possible to specify
- something like "unwound(REG) == REG + constant" using CFI
- as will almost always occure with the stack pointer. I
- guess CFI should be point SP at CFA. Ref: danielj,
- "Describing unsaved stack pointers", posted to dwarf2
- list 2003-08-15. */
- *optimizedp = 0;
- *lvalp = not_lval;
- *addrp = 0;
- *realnump = -1;
- if (valuep)
- /* Store the value. */
- store_typed_address (valuep, builtin_type_void_data_ptr,
- cache->cfa);
- }
- else
- /* Assume that the register can be found in the next inner
- most frame. */
- frame_register_unwind (next_frame, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realnump = regnum;
+ if (valuep)
+ frame_unwind_register (next_frame, (*realnump), valuep);
break;
- case REG_SAME_VALUE:
- frame_register_unwind (next_frame, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ case DWARF2_FRAME_REG_SAME_VALUE:
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realnump = regnum;
+ if (valuep)
+ frame_unwind_register (next_frame, (*realnump), valuep);
+ break;
+
+ case DWARF2_FRAME_REG_CFA:
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ pack_long (valuep, register_type (gdbarch, regnum), cache->cfa);
+ break;
+
+ case DWARF2_FRAME_REG_CFA_OFFSET:
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ pack_long (valuep, register_type (gdbarch, regnum),
+ cache->cfa + cache->reg[regnum].loc.offset);
+ break;
+
+ case DWARF2_FRAME_REG_RA_OFFSET:
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ {
+ CORE_ADDR pc = cache->reg[regnum].loc.offset;
+
+ regnum = gdbarch_dwarf2_reg_to_regnum
+ (gdbarch, cache->retaddr_reg.loc.reg);
+ pc += frame_unwind_register_unsigned (next_frame, regnum);
+ pack_long (valuep, register_type (gdbarch, regnum), pc);
+ }
break;
default:
- internal_error (__FILE__, __LINE__, "Unknown register rule.");
+ internal_error (__FILE__, __LINE__, _("Unknown register rule."));
}
}
dwarf2_frame_prev_register
};
+static const struct frame_unwind dwarf2_signal_frame_unwind =
+{
+ SIGTRAMP_FRAME,
+ dwarf2_signal_frame_this_id,
+ dwarf2_frame_prev_register
+};
+
const struct frame_unwind *
dwarf2_frame_sniffer (struct frame_info *next_frame)
{
/* Grab an address that is guarenteed to reside somewhere within the
function. frame_pc_unwind(), for a no-return next function, can
- end up returning something past the end of this function's body. */
- CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
- if (dwarf2_frame_find_fde (&block_addr))
- return &dwarf2_frame_unwind;
+ end up returning something past the end of this function's body.
+ If the frame we're sniffing for is a signal frame whose start
+ address is placed on the stack by the OS, its FDE must
+ extend one byte before its start address or we will miss it. */
+ CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame,
+ NORMAL_FRAME);
+ struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr);
+ if (!fde)
+ return NULL;
- return NULL;
+ /* On some targets, signal trampolines may have unwind information.
+ We need to recognize them so that we set the frame type
+ correctly. */
+
+ if (fde->cie->signal_frame
+ || dwarf2_frame_signal_frame_p (get_frame_arch (next_frame),
+ next_frame))
+ return &dwarf2_signal_frame_unwind;
+
+ return &dwarf2_frame_unwind;
}
\f
const struct frame_base *
dwarf2_frame_base_sniffer (struct frame_info *next_frame)
{
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- if (dwarf2_frame_find_fde (&pc))
+ CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame,
+ NORMAL_FRAME);
+ if (dwarf2_frame_find_fde (&block_addr))
return &dwarf2_frame_base;
return NULL;
/* Linked list of CIEs for this object. */
struct dwarf2_cie *cie;
- /* Address size for this unit - from unit header. */
- unsigned char addr_size;
-
/* Pointer to the .debug_frame section loaded into memory. */
- char *dwarf_frame_buffer;
+ gdb_byte *dwarf_frame_buffer;
/* Length of the loaded .debug_frame section. */
unsigned long dwarf_frame_size;
/* Base for DW_EH_PE_datarel encodings. */
bfd_vma dbase;
+
+ /* Base for DW_EH_PE_textrel encodings. */
+ bfd_vma tbase;
};
-const struct objfile_data *dwarf2_frame_data;
+const struct objfile_data *dwarf2_frame_objfile_data;
static unsigned int
-read_1_byte (bfd *bfd, char *buf)
+read_1_byte (bfd *abfd, gdb_byte *buf)
{
- return bfd_get_8 (abfd, (bfd_byte *) buf);
+ return bfd_get_8 (abfd, buf);
}
static unsigned int
-read_4_bytes (bfd *abfd, char *buf)
+read_4_bytes (bfd *abfd, gdb_byte *buf)
{
- return bfd_get_32 (abfd, (bfd_byte *) buf);
+ return bfd_get_32 (abfd, buf);
}
static ULONGEST
-read_8_bytes (bfd *abfd, char *buf)
+read_8_bytes (bfd *abfd, gdb_byte *buf)
{
- return bfd_get_64 (abfd, (bfd_byte *) buf);
+ return bfd_get_64 (abfd, buf);
}
static ULONGEST
-read_unsigned_leb128 (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
+read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
{
ULONGEST result;
unsigned int num_read;
int shift;
- unsigned char byte;
+ gdb_byte byte;
result = 0;
shift = 0;
}
static LONGEST
-read_signed_leb128 (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
+read_signed_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
{
LONGEST result;
int shift;
unsigned int num_read;
- unsigned char byte;
+ gdb_byte byte;
result = 0;
shift = 0;
}
while (byte & 0x80);
- if ((shift < 32) && (byte & 0x40))
- result |= -(1 << shift);
+ if (shift < 8 * sizeof (result) && (byte & 0x40))
+ result |= -(((LONGEST)1) << shift);
*bytes_read_ptr = num_read;
}
static ULONGEST
-read_initial_length (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
+read_initial_length (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
{
LONGEST result;
- result = bfd_get_32 (abfd, (bfd_byte *) buf);
+ result = bfd_get_32 (abfd, buf);
if (result == 0xffffffff)
{
- result = bfd_get_64 (abfd, (bfd_byte *) buf + 4);
+ result = bfd_get_64 (abfd, buf + 4);
*bytes_read_ptr = 12;
}
else
position in the FDE, ...). Bit 7, indicates that the address
should be dereferenced. */
-static unsigned char
+static gdb_byte
encoding_for_size (unsigned int size)
{
switch (size)
case 8:
return DW_EH_PE_udata8;
default:
- internal_error (__FILE__, __LINE__, "Unsupported address size");
+ internal_error (__FILE__, __LINE__, _("Unsupported address size"));
}
}
static unsigned int
-size_of_encoded_value (unsigned char encoding)
+size_of_encoded_value (gdb_byte encoding)
{
if (encoding == DW_EH_PE_omit)
return 0;
case DW_EH_PE_udata8:
return 8;
default:
- internal_error (__FILE__, __LINE__, "Invalid or unsupported encoding");
+ internal_error (__FILE__, __LINE__, _("Invalid or unsupported encoding"));
}
}
static CORE_ADDR
-read_encoded_value (struct comp_unit *unit, unsigned char encoding,
- char *buf, unsigned int *bytes_read_ptr)
+read_encoded_value (struct comp_unit *unit, gdb_byte encoding,
+ gdb_byte *buf, unsigned int *bytes_read_ptr)
{
int ptr_len = size_of_encoded_value (DW_EH_PE_absptr);
ptrdiff_t offset;
FDE's. */
if (encoding & DW_EH_PE_indirect)
internal_error (__FILE__, __LINE__,
- "Unsupported encoding: DW_EH_PE_indirect");
+ _("Unsupported encoding: DW_EH_PE_indirect"));
*bytes_read_ptr = 0;
base = 0;
break;
case DW_EH_PE_pcrel:
- base = bfd_get_section_vma (unit->bfd, unit->dwarf_frame_section);
+ base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section);
base += (buf - unit->dwarf_frame_buffer);
break;
case DW_EH_PE_datarel:
base = unit->dbase;
break;
+ case DW_EH_PE_textrel:
+ base = unit->tbase;
+ break;
+ case DW_EH_PE_funcrel:
+ /* FIXME: kettenis/20040501: For now just pretend
+ DW_EH_PE_funcrel is equivalent to DW_EH_PE_absptr. For
+ reading the initial location of an FDE it should be treated
+ as such, and currently that's the only place where this code
+ is used. */
+ base = 0;
+ break;
case DW_EH_PE_aligned:
base = 0;
offset = buf - unit->dwarf_frame_buffer;
}
break;
default:
- internal_error (__FILE__, __LINE__, "Invalid or unsupported encoding");
+ internal_error (__FILE__, __LINE__, _("Invalid or unsupported encoding"));
}
- if ((encoding & 0x0f) == 0x00)
- encoding |= encoding_for_size (ptr_len);
+ if ((encoding & 0x07) == 0x00)
+ {
+ encoding |= encoding_for_size (ptr_len);
+ if (bfd_get_sign_extend_vma (unit->abfd))
+ encoding |= DW_EH_PE_signed;
+ }
switch (encoding & 0x0f)
{
+ case DW_EH_PE_uleb128:
+ {
+ ULONGEST value;
+ gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7;
+ *bytes_read_ptr += read_uleb128 (buf, end_buf, &value) - buf;
+ return base + value;
+ }
case DW_EH_PE_udata2:
*bytes_read_ptr += 2;
return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_udata8:
*bytes_read_ptr += 8;
return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf));
+ case DW_EH_PE_sleb128:
+ {
+ LONGEST value;
+ gdb_byte *end_buf = buf + (sizeof (value) + 1) * 8 / 7;
+ *bytes_read_ptr += read_sleb128 (buf, end_buf, &value) - buf;
+ return base + value;
+ }
case DW_EH_PE_sdata2:
*bytes_read_ptr += 2;
return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf));
*bytes_read_ptr += 8;
return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf));
default:
- internal_error (__FILE__, __LINE__, "Invalid or unsupported encoding");
+ internal_error (__FILE__, __LINE__, _("Invalid or unsupported encoding"));
}
}
\f
struct dwarf2_fde *fde;
CORE_ADDR offset;
- fde = objfile_data (objfile, dwarf2_frame_data);
+ fde = objfile_data (objfile, dwarf2_frame_objfile_data);
if (fde == NULL)
continue;
static void
add_fde (struct comp_unit *unit, struct dwarf2_fde *fde)
{
- fde->next = objfile_data (unit->objfile, dwarf2_frame_data);
- set_objfile_data (unit->objfile, dwarf2_frame_data, fde);
+ fde->next = objfile_data (unit->objfile, dwarf2_frame_objfile_data);
+ set_objfile_data (unit->objfile, dwarf2_frame_objfile_data, fde);
}
#ifdef CC_HAS_LONG_LONG
#define DW64_CIE_ID ~0
#endif
-static char *decode_frame_entry (struct comp_unit *unit, char *start,
- int eh_frame_p);
+static gdb_byte *decode_frame_entry (struct comp_unit *unit, gdb_byte *start,
+ int eh_frame_p);
/* Decode the next CIE or FDE. Return NULL if invalid input, otherwise
the next byte to be processed. */
-static char *
-decode_frame_entry_1 (struct comp_unit *unit, char *start, int eh_frame_p)
+static gdb_byte *
+decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p)
{
- char *buf;
+ gdb_byte *buf, *end;
LONGEST length;
unsigned int bytes_read;
int dwarf64_p;
ULONGEST cie_id;
ULONGEST cie_pointer;
- char *end;
buf = start;
length = read_initial_length (unit->abfd, buf, &bytes_read);
/* This is a CIE. */
struct dwarf2_cie *cie;
char *augmentation;
+ unsigned int cie_version;
/* Record the offset into the .debug_frame section of this CIE. */
cie_pointer = start - unit->dwarf_frame_buffer;
return end;
cie = (struct dwarf2_cie *)
- obstack_alloc (&unit->objfile->psymbol_obstack,
+ obstack_alloc (&unit->objfile->objfile_obstack,
sizeof (struct dwarf2_cie));
cie->initial_instructions = NULL;
cie->cie_pointer = cie_pointer;
/* The encoding for FDE's in a normal .debug_frame section
- depends on the target address size as specified in the
- Compilation Unit Header. */
- cie->encoding = encoding_for_size (unit->addr_size);
+ depends on the target address size. */
+ cie->encoding = DW_EH_PE_absptr;
+
+ /* We'll determine the final value later, but we need to
+ initialize it conservatively. */
+ cie->signal_frame = 0;
/* Check version number. */
- if (read_1_byte (unit->abfd, buf) != DW_CIE_VERSION)
+ cie_version = read_1_byte (unit->abfd, buf);
+ if (cie_version != 1 && cie_version != 3)
return NULL;
+ cie->version = cie_version;
buf += 1;
/* Interpret the interesting bits of the augmentation. */
- augmentation = buf;
- buf = augmentation + strlen (augmentation) + 1;
+ cie->augmentation = augmentation = (char *) buf;
+ buf += (strlen (augmentation) + 1);
+
+ /* Ignore armcc augmentations. We only use them for quirks,
+ and that doesn't happen until later. */
+ if (strncmp (augmentation, "armcc", 5) == 0)
+ augmentation += strlen (augmentation);
/* The GCC 2.x "eh" augmentation has a pointer immediately
following the augmentation string, so it must be handled
read_signed_leb128 (unit->abfd, buf, &bytes_read);
buf += bytes_read;
- cie->return_address_register = read_1_byte (unit->abfd, buf);
- buf += 1;
+ if (cie_version == 1)
+ {
+ cie->return_address_register = read_1_byte (unit->abfd, buf);
+ bytes_read = 1;
+ }
+ else
+ cie->return_address_register = read_unsigned_leb128 (unit->abfd, buf,
+ &bytes_read);
+ cie->return_address_register
+ = dwarf2_frame_adjust_regnum (current_gdbarch,
+ cie->return_address_register,
+ eh_frame_p);
+
+ buf += bytes_read;
cie->saw_z_augmentation = (*augmentation == 'z');
if (cie->saw_z_augmentation)
/* "P" indicates a personality routine in the CIE augmentation. */
else if (*augmentation == 'P')
{
- /* Skip. */
- buf += size_of_encoded_value (*buf++);
+ /* Skip. Avoid indirection since we throw away the result. */
+ gdb_byte encoding = (*buf++) & ~DW_EH_PE_indirect;
+ read_encoded_value (unit, encoding, buf, &bytes_read);
+ buf += bytes_read;
augmentation++;
}
- /* Otherwise we have an unknown augmentation.
- Bail out unless we saw a 'z' prefix. */
- else
+ /* "S" indicates a signal frame, such that the return
+ address must not be decremented to locate the call frame
+ info for the previous frame; it might even be the first
+ instruction of a function, so decrementing it would take
+ us to a different function. */
+ else if (*augmentation == 'S')
{
- if (cie->initial_instructions == NULL)
- return end;
+ cie->signal_frame = 1;
+ augmentation++;
+ }
- /* Skip unknown augmentations. */
- buf = cie->initial_instructions;
+ /* Otherwise we have an unknown augmentation. Assume that either
+ there is no augmentation data, or we saw a 'z' prefix. */
+ else
+ {
+ if (cie->initial_instructions)
+ buf = cie->initial_instructions;
break;
}
}
return NULL;
fde = (struct dwarf2_fde *)
- obstack_alloc (&unit->objfile->psymbol_obstack,
+ obstack_alloc (&unit->objfile->objfile_obstack,
sizeof (struct dwarf2_fde));
fde->cie = find_cie (unit, cie_pointer);
if (fde->cie == NULL)
fde->instructions = buf;
fde->end = end;
+ fde->eh_frame_p = eh_frame_p;
+
add_fde (unit, fde);
}
}
/* Read a CIE or FDE in BUF and decode it. */
-static char *
-decode_frame_entry (struct comp_unit *unit, char *start, int eh_frame_p)
+static gdb_byte *
+decode_frame_entry (struct comp_unit *unit, gdb_byte *start, int eh_frame_p)
{
enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE;
- char *ret;
+ gdb_byte *ret;
const char *msg;
ptrdiff_t start_offset;
case ALIGN4:
complaint (&symfile_complaints,
- "Corrupt data in %s:%s; align 4 workaround apparently succeeded",
+ _("Corrupt data in %s:%s; align 4 workaround apparently succeeded"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
case ALIGN8:
complaint (&symfile_complaints,
- "Corrupt data in %s:%s; align 8 workaround apparently succeeded",
+ _("Corrupt data in %s:%s; align 8 workaround apparently succeeded"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
default:
complaint (&symfile_complaints,
- "Corrupt data in %s:%s",
+ _("Corrupt data in %s:%s"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
return ret;
}
-
\f
/* FIXME: kettenis/20030504: This still needs to be integrated with
dwarf2read.c in a better way. */
/* Imported from dwarf2read.c. */
-extern file_ptr dwarf_frame_offset;
-extern unsigned int dwarf_frame_size;
extern asection *dwarf_frame_section;
-extern file_ptr dwarf_eh_frame_offset;
-extern unsigned int dwarf_eh_frame_size;
extern asection *dwarf_eh_frame_section;
/* Imported from dwarf2read.c. */
-extern char *dwarf2_read_section (struct objfile *objfile, file_ptr offset,
- unsigned int size, asection *sectp);
+extern gdb_byte *dwarf2_read_section (struct objfile *objfile, asection *sectp);
void
dwarf2_build_frame_info (struct objfile *objfile)
{
struct comp_unit unit;
- char *frame_ptr;
+ gdb_byte *frame_ptr;
/* Build a minimal decoding of the DWARF2 compilation unit. */
unit.abfd = objfile->obfd;
unit.objfile = objfile;
- unit.addr_size = objfile->obfd->arch_info->bits_per_address / 8;
unit.dbase = 0;
+ unit.tbase = 0;
/* First add the information from the .eh_frame section. That way,
the FDEs from that section are searched last. */
- if (dwarf_eh_frame_offset)
+ if (dwarf_eh_frame_section)
{
- asection *got;
+ asection *got, *txt;
unit.cie = NULL;
unit.dwarf_frame_buffer = dwarf2_read_section (objfile,
- dwarf_eh_frame_offset,
- dwarf_eh_frame_size,
dwarf_eh_frame_section);
- unit.dwarf_frame_size = dwarf_eh_frame_size;
+ unit.dwarf_frame_size = bfd_get_section_size (dwarf_eh_frame_section);
unit.dwarf_frame_section = dwarf_eh_frame_section;
/* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base
if (got)
unit.dbase = got->vma;
+ /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64
+ so far. */
+ txt = bfd_get_section_by_name (unit.abfd, ".text");
+ if (txt)
+ unit.tbase = txt->vma;
+
frame_ptr = unit.dwarf_frame_buffer;
while (frame_ptr < unit.dwarf_frame_buffer + unit.dwarf_frame_size)
frame_ptr = decode_frame_entry (&unit, frame_ptr, 1);
}
- if (dwarf_frame_offset)
+ if (dwarf_frame_section)
{
unit.cie = NULL;
unit.dwarf_frame_buffer = dwarf2_read_section (objfile,
- dwarf_frame_offset,
- dwarf_frame_size,
dwarf_frame_section);
- unit.dwarf_frame_size = dwarf_frame_size;
+ unit.dwarf_frame_size = bfd_get_section_size (dwarf_frame_section);
unit.dwarf_frame_section = dwarf_frame_section;
frame_ptr = unit.dwarf_frame_buffer;
void
_initialize_dwarf2_frame (void)
{
- dwarf2_frame_data = register_objfile_data ();
+ dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init);
+ dwarf2_frame_objfile_data = register_objfile_data ();
}