146 lines
4.8 KiB
C
146 lines
4.8 KiB
C
/* Frame unwinder for frames with DWARF Call Frame Information.
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Copyright (C) 2003-2016 Free Software Foundation, Inc.
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Contributed by Mark Kettenis.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef DWARF2_FRAME_H
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#define DWARF2_FRAME_H 1
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struct gdbarch;
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struct objfile;
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struct frame_info;
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struct dwarf2_per_cu_data;
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struct agent_expr;
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struct axs_value;
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/* Register rule. */
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enum dwarf2_frame_reg_rule
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{
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/* Make certain that 0 maps onto the correct enum value; the
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corresponding structure is being initialized using memset zero.
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This indicates that CFI didn't provide any information at all
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about a register, leaving how to obtain its value totally
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unspecified. */
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DWARF2_FRAME_REG_UNSPECIFIED = 0,
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/* The term "undefined" comes from the DWARF2 CFI spec which this
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code is moddeling; it indicates that the register's value is
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"undefined". GCC uses the less formal term "unsaved". Its
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definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED.
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The failure to differentiate the two helps explain a few problems
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with the CFI generated by GCC. */
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DWARF2_FRAME_REG_UNDEFINED,
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DWARF2_FRAME_REG_SAVED_OFFSET,
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DWARF2_FRAME_REG_SAVED_REG,
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DWARF2_FRAME_REG_SAVED_EXP,
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DWARF2_FRAME_REG_SAME_VALUE,
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/* These are defined in Dwarf3. */
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DWARF2_FRAME_REG_SAVED_VAL_OFFSET,
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DWARF2_FRAME_REG_SAVED_VAL_EXP,
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/* These aren't defined by the DWARF2 CFI specification, but are
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used internally by GDB. */
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DWARF2_FRAME_REG_FN, /* Call a registered function. */
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DWARF2_FRAME_REG_RA, /* Return Address. */
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DWARF2_FRAME_REG_RA_OFFSET, /* Return Address with offset. */
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DWARF2_FRAME_REG_CFA, /* Call Frame Address. */
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DWARF2_FRAME_REG_CFA_OFFSET /* Call Frame Address with offset. */
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};
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/* Register state. */
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struct dwarf2_frame_state_reg
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{
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/* Each register save state can be described in terms of a CFA slot,
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another register, or a location expression. */
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union {
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LONGEST offset;
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ULONGEST reg;
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const gdb_byte *exp;
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struct value *(*fn) (struct frame_info *this_frame, void **this_cache,
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int regnum);
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} loc;
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ULONGEST exp_len;
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enum dwarf2_frame_reg_rule how;
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};
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/* Set the architecture-specific register state initialization
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function for GDBARCH to INIT_REG. */
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extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,
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void (*init_reg) (struct gdbarch *, int,
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struct dwarf2_frame_state_reg *,
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struct frame_info *));
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/* Set the architecture-specific signal trampoline recognition
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function for GDBARCH to SIGNAL_FRAME_P. */
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extern void
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dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
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int (*signal_frame_p) (struct gdbarch *,
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struct frame_info *));
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/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
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register numbers. */
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extern void
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dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
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int (*adjust_regnum) (struct gdbarch *,
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int, int));
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/* Append the DWARF-2 frame unwinders to GDBARCH's list. */
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void dwarf2_append_unwinders (struct gdbarch *gdbarch);
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/* Return the frame base methods for the function that contains PC, or
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NULL if it can't be handled by the DWARF CFI frame unwinder. */
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extern const struct frame_base *
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dwarf2_frame_base_sniffer (struct frame_info *this_frame);
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/* Compute the DWARF CFA for a frame. */
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CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);
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/* Find the CFA information for PC.
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Return 1 if a register is used for the CFA, or 0 if another
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expression is used. Throw an exception on error.
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GDBARCH is the architecture to use.
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DATA is the per-CU data.
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REGNUM_OUT is an out parameter that is set to the register number.
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OFFSET_OUT is the offset to use from this register.
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These are only filled in when 1 is returned.
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TEXT_OFFSET_OUT, CFA_START_OUT, and CFA_END_OUT describe the CFA
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in other cases. These are only used when 0 is returned. */
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extern int dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
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struct dwarf2_per_cu_data *data,
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int *regnum_out, LONGEST *offset_out,
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CORE_ADDR *text_offset_out,
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const gdb_byte **cfa_start_out,
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const gdb_byte **cfa_end_out);
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#endif /* dwarf2-frame.h */
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