/* Frame unwinder for frames with DWARF Call Frame Information.
- Copyright (C) 2003-2013 Free Software Foundation, Inc.
+ Copyright (C) 2003-2015 Free Software Foundation, Inc.
Contributed by Mark Kettenis.
#include "objfiles.h"
#include "regcache.h"
#include "value.h"
-
-#include "gdb_assert.h"
-#include <string.h>
+#include "record.h"
#include "complaints.h"
#include "dwarf2-frame.h"
#include "ax.h"
#include "dwarf2loc.h"
-#include "exceptions.h"
#include "dwarf2-frame-tailcall.h"
struct comp_unit;
CORE_ADDR func_base);
\f
+enum cfa_how_kind
+{
+ CFA_UNSET,
+ CFA_REG_OFFSET,
+ CFA_EXP
+};
+
+struct dwarf2_frame_state_reg_info
+{
+ struct dwarf2_frame_state_reg *reg;
+ int num_regs;
+
+ LONGEST cfa_offset;
+ ULONGEST cfa_reg;
+ enum cfa_how_kind cfa_how;
+ const gdb_byte *cfa_exp;
+
+ /* Used to implement DW_CFA_remember_state. */
+ struct dwarf2_frame_state_reg_info *prev;
+};
+
/* Structure describing a frame state. */
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 *reg;
- int num_regs;
-
- LONGEST cfa_offset;
- ULONGEST cfa_reg;
- enum {
- CFA_UNSET,
- CFA_REG_OFFSET,
- CFA_EXP
- } cfa_how;
- const gdb_byte *cfa_exp;
-
- /* Used to implement DW_CFA_remember_state. */
- struct dwarf2_frame_state_reg_info *prev;
- } regs;
+ struct dwarf2_frame_state_reg_info regs;
/* The PC described by the current frame state. */
CORE_ADDR pc;
{
struct frame_info *this_frame = (struct frame_info *) baton;
struct gdbarch *gdbarch = get_frame_arch (this_frame);
- int regnum;
- gdb_byte *buf;
-
- regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
-
- buf = alloca (register_size (gdbarch, regnum));
- get_frame_register (this_frame, regnum, buf);
+ int regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
- return unpack_pointer (register_type (gdbarch, regnum), buf);
+ return address_from_register (regnum, this_frame);
}
/* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */
{
struct dwarf2_frame_state_reg_info *new_rs;
- new_rs = XMALLOC (struct dwarf2_frame_state_reg_info);
+ new_rs = XNEW (struct dwarf2_frame_state_reg_info);
*new_rs = fs->regs;
fs->regs.reg = dwarf2_frame_state_copy_regs (&fs->regs);
fs->regs.prev = new_rs;
dwarf2_frame_find_quirks (struct dwarf2_frame_state *fs,
struct dwarf2_fde *fde)
{
- struct symtab *s;
+ struct compunit_symtab *cust;
- s = find_pc_symtab (fs->pc);
- if (s == NULL)
+ cust = find_pc_compunit_symtab (fs->pc);
+ if (cust == NULL)
return;
- if (producer_is_realview (s->producer))
+ if (producer_is_realview (COMPUNIT_PRODUCER (cust)))
{
if (fde->cie->version == 1)
fs->armcc_cfa_offsets_sf = 1;
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
+ && (!startswith (fde->cie->augmentation, "armcc")
|| strchr (fde->cie->augmentation + 5, '+') == NULL))
fs->armcc_cfa_offsets_reversed = 1;
}
\f
-void
-dwarf2_compile_cfa_to_ax (struct agent_expr *expr, struct axs_value *loc,
- struct gdbarch *gdbarch,
- CORE_ADDR pc,
- struct dwarf2_per_cu_data *data)
+/* See dwarf2-frame.h. */
+
+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)
{
struct dwarf2_fde *fde;
CORE_ADDR text_offset;
if (regnum == -1)
error (_("Unable to access DWARF register number %d"),
(int) fs.regs.cfa_reg); /* FIXME */
- ax_reg (expr, regnum);
- if (fs.regs.cfa_offset != 0)
- {
- if (fs.armcc_cfa_offsets_reversed)
- ax_const_l (expr, -fs.regs.cfa_offset);
- else
- ax_const_l (expr, fs.regs.cfa_offset);
- ax_simple (expr, aop_add);
- }
+ *regnum_out = regnum;
+ if (fs.armcc_cfa_offsets_reversed)
+ *offset_out = -fs.regs.cfa_offset;
+ else
+ *offset_out = fs.regs.cfa_offset;
+ return 1;
}
- break;
case CFA_EXP:
- ax_const_l (expr, text_offset);
- dwarf2_compile_expr_to_ax (expr, loc, gdbarch, addr_size,
- fs.regs.cfa_exp,
- fs.regs.cfa_exp + fs.regs.cfa_exp_len,
- data);
- break;
+ *text_offset_out = text_offset;
+ *cfa_start_out = fs.regs.cfa_exp;
+ *cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len;
+ return 0;
default:
internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
struct dwarf2_frame_cache *cache;
struct dwarf2_frame_state *fs;
struct dwarf2_fde *fde;
- volatile struct gdb_exception ex;
CORE_ADDR entry_pc;
const gdb_byte *instr;
reset_cache_cleanup = make_cleanup (clear_pointer_cleanup, this_cache);
/* Allocate and initialize the frame state. */
- fs = XZALLOC (struct dwarf2_frame_state);
+ fs = XCNEW (struct dwarf2_frame_state);
old_chain = make_cleanup (dwarf2_frame_state_free, fs);
/* Unwind the PC.
execute_cfa_program (fde, instr, fde->end, gdbarch,
get_frame_address_in_block (this_frame), fs);
- TRY_CATCH (ex, RETURN_MASK_ERROR)
+ TRY
{
/* Calculate the CFA. */
switch (fs->regs.cfa_how)
internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
}
}
- if (ex.reason < 0)
+ CATCH (ex, RETURN_MASK_ERROR)
{
if (ex.error == NOT_AVAILABLE_ERROR)
{
throw_exception (ex);
}
+ END_CATCH
/* Initialize the register state. */
{
dwarf2_frame_cache (this_frame, this_cache);
if (cache->unavailable_retaddr)
+ (*this_id) = frame_id_build_unavailable_stack (get_frame_func (this_frame));
+ else if (cache->undefined_retaddr)
return;
-
- if (cache->undefined_retaddr)
- return;
-
- (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame));
+ else
+ (*this_id) = frame_id_build (cache->cfa, get_frame_func (this_frame));
}
static struct value *
CORE_ADDR
dwarf2_frame_cfa (struct frame_info *this_frame)
{
+ if (frame_unwinder_is (this_frame, &record_btrace_tailcall_frame_unwind)
+ || frame_unwinder_is (this_frame, &record_btrace_frame_unwind))
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("cfa not available for record btrace target"));
+
while (get_frame_type (this_frame) == INLINE_FRAME)
this_frame = get_prev_frame (this_frame);
- /* This restriction could be lifted if other unwinders are known to
- compute the frame base in a way compatible with the DWARF
- unwinder. */
- if (!frame_unwinder_is (this_frame, &dwarf2_frame_unwind)
- && !frame_unwinder_is (this_frame, &dwarf2_tailcall_frame_unwind))
- error (_("can't compute CFA for this frame"));
if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE)
throw_error (NOT_AVAILABLE_ERROR,
- _("can't compute CFA for this frame: "
- "required registers or memory are unavailable"));
+ _("can't compute CFA for this frame: "
+ "required registers or memory are unavailable"));
+
+ if (get_frame_id (this_frame).stack_status != FID_STACK_VALID)
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("can't compute CFA for this frame: "
+ "frame base not available"));
+
return get_frame_base (this_frame);
}
\f
/* Ignore armcc augmentations. We only use them for quirks,
and that doesn't happen until later. */
- if (strncmp (augmentation, "armcc", 5) == 0)
+ if (startswith (augmentation, "armcc"))
augmentation += strlen (augmentation);
/* The GCC 2.x "eh" augmentation has a pointer immediately
{
/* This is a FDE. */
struct dwarf2_fde *fde;
+ CORE_ADDR addr;
/* Check that an FDE was expected. */
if ((entry_type & EH_FDE_TYPE_ID) == 0)
gdb_assert (fde->cie != NULL);
- fde->initial_location =
- read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size,
- buf, &bytes_read, 0);
+ addr = read_encoded_value (unit, fde->cie->encoding, fde->cie->ptr_size,
+ buf, &bytes_read, 0);
+ fde->initial_location = gdbarch_adjust_dwarf2_addr (gdbarch, addr);
buf += bytes_read;
fde->address_range =
read_encoded_value (unit, fde->cie->encoding & 0x0f,
fde->cie->ptr_size, buf, &bytes_read, 0);
+ addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + fde->address_range);
+ fde->address_range = addr - fde->initial_location;
buf += bytes_read;
/* A 'z' augmentation in the CIE implies the presence of an
struct dwarf2_cie_table cie_table;
struct dwarf2_fde_table fde_table;
struct dwarf2_fde_table *fde_table2;
- volatile struct gdb_exception e;
cie_table.num_entries = 0;
cie_table.entries = NULL;
if (txt)
unit->tbase = txt->vma;
- TRY_CATCH (e, RETURN_MASK_ERROR)
+ TRY
{
frame_ptr = unit->dwarf_frame_buffer;
while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size)
EH_CIE_OR_FDE_TYPE_ID);
}
- if (e.reason < 0)
+ CATCH (e, RETURN_MASK_ERROR)
{
warning (_("skipping .eh_frame info of %s: %s"),
objfile_name (objfile), e.message);
}
/* The cie_table is discarded by the next if. */
}
+ END_CATCH
if (cie_table.num_entries != 0)
{
{
int num_old_fde_entries = fde_table.num_entries;
- TRY_CATCH (e, RETURN_MASK_ERROR)
+ TRY
{
frame_ptr = unit->dwarf_frame_buffer;
while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size)
&cie_table, &fde_table,
EH_CIE_OR_FDE_TYPE_ID);
}
- if (e.reason < 0)
+ CATCH (e, RETURN_MASK_ERROR)
{
warning (_("skipping .debug_frame info of %s: %s"),
objfile_name (objfile), e.message);
fde_table.num_entries = num_old_fde_entries;
/* The cie_table is discarded by the next if. */
}
+ END_CATCH
}
/* Discard the cie_table, it is no longer needed. */
projects / deliverable / binutils-gdb.git / blobdiff