mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-01 05:55:23 +08:00
4a94e36819
This commit brings all the changes made by running gdb/copyright.py as per GDB's Start of New Year Procedure. For the avoidance of doubt, all changes in this commits were performed by the script.
266 lines
8.0 KiB
C++
266 lines
8.0 KiB
C++
/* Frame unwinder for frames with DWARF Call Frame Information.
|
|
|
|
Copyright (C) 2003-2022 Free Software Foundation, Inc.
|
|
|
|
Contributed by Mark Kettenis.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef DWARF2_FRAME_H
|
|
#define DWARF2_FRAME_H 1
|
|
|
|
struct gdbarch;
|
|
struct frame_info;
|
|
struct dwarf2_per_cu_data;
|
|
struct agent_expr;
|
|
struct axs_value;
|
|
|
|
/* Register rule. */
|
|
|
|
enum dwarf2_frame_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 its value totally
|
|
unspecified. */
|
|
DWARF2_FRAME_REG_UNSPECIFIED = 0,
|
|
|
|
/* The term "undefined" comes from the DWARF2 CFI spec which this
|
|
code is modeling; it indicates that the register's value is
|
|
"undefined". GCC uses the less formal term "unsaved". Its
|
|
definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED.
|
|
The failure to differentiate the two helps explain a few problems
|
|
with the CFI generated by GCC. */
|
|
DWARF2_FRAME_REG_UNDEFINED,
|
|
DWARF2_FRAME_REG_SAVED_OFFSET,
|
|
DWARF2_FRAME_REG_SAVED_REG,
|
|
DWARF2_FRAME_REG_SAVED_EXP,
|
|
DWARF2_FRAME_REG_SAME_VALUE,
|
|
|
|
/* These are defined in Dwarf3. */
|
|
DWARF2_FRAME_REG_SAVED_VAL_OFFSET,
|
|
DWARF2_FRAME_REG_SAVED_VAL_EXP,
|
|
|
|
/* These aren't defined by the DWARF2 CFI specification, but are
|
|
used internally by GDB. */
|
|
DWARF2_FRAME_REG_FN, /* Call a registered function. */
|
|
DWARF2_FRAME_REG_RA, /* Return Address. */
|
|
DWARF2_FRAME_REG_RA_OFFSET, /* Return Address with offset. */
|
|
DWARF2_FRAME_REG_CFA, /* Call Frame Address. */
|
|
DWARF2_FRAME_REG_CFA_OFFSET /* Call Frame Address with offset. */
|
|
};
|
|
|
|
/* Register state. */
|
|
|
|
struct dwarf2_frame_state_reg
|
|
{
|
|
/* Each register save state can be described in terms of a CFA slot,
|
|
another register, or a location expression. */
|
|
union {
|
|
LONGEST offset;
|
|
ULONGEST reg;
|
|
struct
|
|
{
|
|
const gdb_byte *start;
|
|
ULONGEST len;
|
|
} exp;
|
|
struct value *(*fn) (struct frame_info *this_frame, void **this_cache,
|
|
int regnum);
|
|
} loc;
|
|
enum dwarf2_frame_reg_rule how;
|
|
};
|
|
|
|
enum cfa_how_kind
|
|
{
|
|
CFA_UNSET,
|
|
CFA_REG_OFFSET,
|
|
CFA_EXP
|
|
};
|
|
|
|
struct dwarf2_frame_state_reg_info
|
|
{
|
|
dwarf2_frame_state_reg_info () = default;
|
|
~dwarf2_frame_state_reg_info ()
|
|
{
|
|
delete prev;
|
|
}
|
|
|
|
/* Copy constructor. */
|
|
dwarf2_frame_state_reg_info (const dwarf2_frame_state_reg_info &src)
|
|
: reg (src.reg), cfa_offset (src.cfa_offset),
|
|
cfa_reg (src.cfa_reg), cfa_how (src.cfa_how), cfa_exp (src.cfa_exp),
|
|
prev (src.prev)
|
|
{
|
|
}
|
|
|
|
/* Assignment operator for both move-assignment and copy-assignment. */
|
|
dwarf2_frame_state_reg_info&
|
|
operator= (dwarf2_frame_state_reg_info rhs)
|
|
{
|
|
swap (*this, rhs);
|
|
return *this;
|
|
}
|
|
|
|
/* Move constructor. */
|
|
dwarf2_frame_state_reg_info (dwarf2_frame_state_reg_info &&rhs) noexcept
|
|
: reg (std::move (rhs.reg)), cfa_offset (rhs.cfa_offset),
|
|
cfa_reg (rhs.cfa_reg), cfa_how (rhs.cfa_how), cfa_exp (rhs.cfa_exp),
|
|
prev (rhs.prev)
|
|
{
|
|
rhs.prev = nullptr;
|
|
}
|
|
|
|
/* If necessary, enlarge the register set to hold NUM_REGS_REQUESTED
|
|
registers. */
|
|
void alloc_regs (int num_regs_requested)
|
|
{
|
|
gdb_assert (num_regs_requested > 0);
|
|
|
|
if (num_regs_requested <= reg.size ())
|
|
return;
|
|
|
|
reg.resize (num_regs_requested);
|
|
}
|
|
|
|
std::vector<struct dwarf2_frame_state_reg> reg;
|
|
|
|
LONGEST cfa_offset = 0;
|
|
ULONGEST cfa_reg = 0;
|
|
enum cfa_how_kind cfa_how = CFA_UNSET;
|
|
const gdb_byte *cfa_exp = NULL;
|
|
|
|
/* Used to implement DW_CFA_remember_state. */
|
|
struct dwarf2_frame_state_reg_info *prev = NULL;
|
|
|
|
private:
|
|
friend void swap (dwarf2_frame_state_reg_info& lhs,
|
|
dwarf2_frame_state_reg_info& rhs)
|
|
{
|
|
using std::swap;
|
|
|
|
swap (lhs.reg, rhs.reg);
|
|
swap (lhs.cfa_offset, rhs.cfa_offset);
|
|
swap (lhs.cfa_reg, rhs.cfa_reg);
|
|
swap (lhs.cfa_how, rhs.cfa_how);
|
|
swap (lhs.cfa_exp, rhs.cfa_exp);
|
|
swap (lhs.prev, rhs.prev);
|
|
}
|
|
};
|
|
|
|
struct dwarf2_cie;
|
|
|
|
/* Structure describing a frame state. */
|
|
|
|
struct dwarf2_frame_state
|
|
{
|
|
dwarf2_frame_state (CORE_ADDR pc, struct dwarf2_cie *cie);
|
|
|
|
/* 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 regs {};
|
|
|
|
/* The PC described by the current frame state. */
|
|
CORE_ADDR pc;
|
|
|
|
/* Initial register set from the CIE.
|
|
Used to implement DW_CFA_restore. */
|
|
struct dwarf2_frame_state_reg_info initial {};
|
|
|
|
/* The information we care about from the CIE. */
|
|
const LONGEST data_align;
|
|
const ULONGEST code_align;
|
|
const 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. */
|
|
bool armcc_cfa_offsets_sf = false;
|
|
|
|
/* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that
|
|
the CFA is defined as REG - OFFSET rather than REG + OFFSET. */
|
|
bool armcc_cfa_offsets_reversed = false;
|
|
};
|
|
|
|
/* When this is true the DWARF frame unwinders can be used if they are
|
|
registered with the gdbarch. Not all architectures can or do use the
|
|
DWARF unwinders. Setting this to true on a target that does not
|
|
otherwise support the DWARF unwinders has no effect. */
|
|
extern bool dwarf2_frame_unwinders_enabled_p;
|
|
|
|
/* Set the architecture-specific register state initialization
|
|
function for GDBARCH to INIT_REG. */
|
|
|
|
extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,
|
|
void (*init_reg) (struct gdbarch *, int,
|
|
struct dwarf2_frame_state_reg *,
|
|
struct frame_info *));
|
|
|
|
/* Set the architecture-specific signal trampoline recognition
|
|
function for GDBARCH to SIGNAL_FRAME_P. */
|
|
|
|
extern void
|
|
dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
|
|
int (*signal_frame_p) (struct gdbarch *,
|
|
struct frame_info *));
|
|
|
|
/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
|
|
register numbers. */
|
|
|
|
extern void
|
|
dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
|
|
int (*adjust_regnum) (struct gdbarch *,
|
|
int, int));
|
|
|
|
/* Append the DWARF-2 frame unwinders to GDBARCH's list. */
|
|
|
|
void dwarf2_append_unwinders (struct gdbarch *gdbarch);
|
|
|
|
/* Return the frame base methods for the function that contains PC, or
|
|
NULL if it can't be handled by the DWARF CFI frame unwinder. */
|
|
|
|
extern const struct frame_base *
|
|
dwarf2_frame_base_sniffer (struct frame_info *this_frame);
|
|
|
|
/* Compute the DWARF CFA for a frame. */
|
|
|
|
CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);
|
|
|
|
/* Find the CFA information for PC.
|
|
|
|
Return 1 if a register is used for the CFA, or 0 if another
|
|
expression is used. Throw an exception on error.
|
|
|
|
GDBARCH is the architecture to use.
|
|
DATA is the per-CU data.
|
|
|
|
REGNUM_OUT is an out parameter that is set to the register number.
|
|
OFFSET_OUT is the offset to use from this register.
|
|
These are only filled in when 1 is returned.
|
|
|
|
TEXT_OFFSET_OUT, CFA_START_OUT, and CFA_END_OUT describe the CFA
|
|
in other cases. These are only used when 0 is returned. */
|
|
|
|
extern int dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
|
|
struct dwarf2_per_cu_data *data,
|
|
int *regnum_out, LONGEST *offset_out,
|
|
CORE_ADDR *text_offset_out,
|
|
const gdb_byte **cfa_start_out,
|
|
const gdb_byte **cfa_end_out);
|
|
|
|
#endif /* dwarf2-frame.h */
|