/* Frame unwinder for frames with DWARF Call Frame Information.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003-2016 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/>. */
#ifndef DWARF2_FRAME_H
#define DWARF2_FRAME_H 1
+struct gdbarch;
struct objfile;
struct frame_info;
+struct dwarf2_per_cu_data;
+struct agent_expr;
+struct axs_value;
-/* Return the frame unwind methods for the function that contains PC,
- or NULL if it can't be handled by DWARF CFI frame unwinder. */
+/* Register rule. */
-const struct frame_unwind *dwarf2_frame_sniffer (struct frame_info *next_frame);
+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 moddeling; 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;
+ const gdb_byte *exp;
+ struct value *(*fn) (struct frame_info *this_frame, void **this_cache,
+ int regnum);
+ } loc;
+ ULONGEST exp_len;
+ enum dwarf2_frame_reg_rule how;
+};
+
+/* 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. */
-const struct frame_base *dwarf2_frame_base_sniffer (struct frame_info *next_frame);
+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.
-/* Register the DWARF CFI for OBJFILE. */
+ TEXT_OFFSET_OUT, CFA_START_OUT, and CFA_END_OUT describe the CFA
+ in other cases. These are only used when 0 is returned. */
-void dwarf2_frame_build_info (struct objfile *objfile);
+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 */
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