/* Traditional frame unwind support, for GDB the GNU Debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003-2021 Free Software Foundation, Inc.
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 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 "frame.h"
#include "trad-frame.h"
#include "regcache.h"
+#include "frame-unwind.h"
+#include "target.h"
+#include "value.h"
+#include "gdbarch.h"
+#include "gdbsupport/traits.h"
+
+struct trad_frame_cache
+{
+ struct frame_info *this_frame;
+ CORE_ADDR this_base;
+ trad_frame_saved_reg *prev_regs;
+ struct frame_id this_id;
+};
+
+struct trad_frame_cache *
+trad_frame_cache_zalloc (struct frame_info *this_frame)
+{
+ struct trad_frame_cache *this_trad_cache;
+
+ this_trad_cache = FRAME_OBSTACK_ZALLOC (struct trad_frame_cache);
+ this_trad_cache->prev_regs = trad_frame_alloc_saved_regs (this_frame);
+ this_trad_cache->this_frame = this_frame;
+ return this_trad_cache;
+}
+
+/* See trad-frame.h. */
+
+void
+trad_frame_reset_saved_regs (struct gdbarch *gdbarch,
+ trad_frame_saved_reg *regs)
+{
+ int numregs = gdbarch_num_cooked_regs (gdbarch);
+
+ for (int regnum = 0; regnum < numregs; regnum++)
+ regs[regnum].set_realreg (regnum);
+}
+
+trad_frame_saved_reg *
+trad_frame_alloc_saved_regs (struct gdbarch *gdbarch)
+{
+#ifdef HAVE_IS_TRIVIALLY_CONSTRUCTIBLE
+ gdb_static_assert (std::is_trivially_constructible<trad_frame_saved_reg>::value);
+#endif
+
+ int numregs = gdbarch_num_cooked_regs (gdbarch);
+ trad_frame_saved_reg *this_saved_regs
+ = FRAME_OBSTACK_CALLOC (numregs, trad_frame_saved_reg);
+
+ trad_frame_reset_saved_regs (gdbarch, this_saved_regs);
+ return this_saved_regs;
+}
/* A traditional frame is unwound by analysing the function prologue
and using the information gathered to track registers. For
non-optimized frames, the technique is reliable (just need to check
for all potential instruction sequences). */
-struct trad_frame_saved_reg *
-trad_frame_alloc_saved_regs (struct frame_info *next_frame)
+trad_frame_saved_reg *
+trad_frame_alloc_saved_regs (struct frame_info *this_frame)
{
- int regnum;
- struct gdbarch *gdbarch = get_frame_arch (next_frame);
- int numregs = NUM_REGS + NUM_PSEUDO_REGS;
- struct trad_frame_saved_reg *this_saved_regs
- = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
- for (regnum = 0; regnum < numregs; regnum++)
- this_saved_regs[regnum].realnum = regnum;
- return this_saved_regs;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+
+ return trad_frame_alloc_saved_regs (gdbarch);
+}
+
+int
+trad_frame_value_p (trad_frame_saved_reg this_saved_regs[], int regnum)
+{
+ return this_saved_regs[regnum].is_value ();
+}
+
+int
+trad_frame_addr_p (trad_frame_saved_reg this_saved_regs[], int regnum)
+{
+ return this_saved_regs[regnum].is_addr ();
+}
+
+int
+trad_frame_realreg_p (trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ return this_saved_regs[regnum].is_realreg ();
+}
+
+/* See trad-frame.h. */
+
+bool
+trad_frame_value_bytes_p (trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ return this_saved_regs[regnum].is_value_bytes ();
}
void
-trad_frame_register_value (struct trad_frame_saved_reg this_saved_regs[],
- int regnum, LONGEST val)
+trad_frame_set_value (trad_frame_saved_reg this_saved_regs[],
+ int regnum, LONGEST val)
{
- /* Make the REALNUM invalid, indicating that the ADDR contains the
- register's value. */
- this_saved_regs[regnum].realnum = -1;
- this_saved_regs[regnum].addr = val;
+ this_saved_regs[regnum].set_value (val);
}
+/* See trad-frame.h. */
+
void
-trad_frame_prev_register (struct frame_info *next_frame,
- struct trad_frame_saved_reg this_saved_regs[],
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
-{
- struct gdbarch *gdbarch = get_frame_arch (next_frame);
- if (this_saved_regs[regnum].realnum >= 0
- && this_saved_regs[regnum].addr != 0)
- {
- /* The register was saved in memory. */
- *optimizedp = 0;
- *lvalp = lval_memory;
- *addrp = this_saved_regs[regnum].addr;
- *realnump = -1;
- if (bufferp != NULL)
- {
- /* Read the value in from memory. */
- get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp,
- register_size (gdbarch, regnum));
- }
- }
- else if (this_saved_regs[regnum].realnum >= 0
- && this_saved_regs[regnum].addr == 0)
+trad_frame_set_realreg (trad_frame_saved_reg this_saved_regs[],
+ int regnum, int realreg)
+{
+ this_saved_regs[regnum].set_realreg (realreg);
+}
+
+/* See trad-frame.h. */
+
+void
+trad_frame_set_addr (trad_frame_saved_reg this_saved_regs[],
+ int regnum, CORE_ADDR addr)
+{
+ this_saved_regs[regnum].set_addr (addr);
+}
+
+void
+trad_frame_set_reg_value (struct trad_frame_cache *this_trad_cache,
+ int regnum, LONGEST val)
+{
+ /* External interface for users of trad_frame_cache
+ (who cannot access the prev_regs object directly). */
+ trad_frame_set_value (this_trad_cache->prev_regs, regnum, val);
+}
+
+void
+trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
+ int regnum, int realreg)
+{
+ trad_frame_set_realreg (this_trad_cache->prev_regs, regnum, realreg);
+}
+
+void
+trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
+ int regnum, CORE_ADDR addr)
+{
+ trad_frame_set_addr (this_trad_cache->prev_regs, regnum, addr);
+}
+
+void
+trad_frame_set_reg_regmap (struct trad_frame_cache *this_trad_cache,
+ const struct regcache_map_entry *regmap,
+ CORE_ADDR addr, size_t size)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_trad_cache->this_frame);
+ int offs = 0, count;
+
+ for (; (count = regmap->count) != 0; regmap++)
{
- /* As the next frame to return the value of the register. */
- frame_register_unwind (next_frame, this_saved_regs[regnum].realnum,
- optimizedp, lvalp, addrp, realnump, bufferp);
+ int regno = regmap->regno;
+ int slot_size = regmap->size;
+
+ if (slot_size == 0 && regno != REGCACHE_MAP_SKIP)
+ slot_size = register_size (gdbarch, regno);
+
+ if (offs + slot_size > size)
+ break;
+
+ if (regno == REGCACHE_MAP_SKIP)
+ offs += count * slot_size;
+ else
+ for (; count--; regno++, offs += slot_size)
+ {
+ /* Mimic the semantics of regcache::transfer_regset if a
+ register slot's size does not match the size of a
+ register.
+
+ If a register slot is larger than a register, assume
+ the register's value is stored in the first N bytes of
+ the slot and ignore the remaining bytes.
+
+ If the register slot is smaller than the register,
+ assume that the slot contains the low N bytes of the
+ register's value. Since trad_frame assumes that
+ registers stored by address are sized according to the
+ register, read the low N bytes and zero-extend them to
+ generate a register value. */
+ if (slot_size >= register_size (gdbarch, regno))
+ trad_frame_set_reg_addr (this_trad_cache, regno, addr + offs);
+ else
+ {
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ gdb_byte buf[slot_size];
+
+ if (target_read_memory (addr + offs, buf, sizeof buf) == 0)
+ {
+ LONGEST val
+ = extract_unsigned_integer (buf, sizeof buf, byte_order);
+ trad_frame_set_reg_value (this_trad_cache, regno, val);
+ }
+ }
+ }
}
+}
+
+void
+trad_frame_set_unknown (trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ this_saved_regs[regnum].set_unknown ();
+}
+
+/* See trad-frame.h. */
+
+void
+trad_frame_set_value_bytes (trad_frame_saved_reg this_saved_regs[],
+ int regnum,
+ gdb::array_view<const gdb_byte> bytes)
+{
+ /* Allocate the space and copy the data bytes. */
+ gdb_byte *data = FRAME_OBSTACK_CALLOC (bytes.size (), gdb_byte);
+ memcpy (data, bytes.data (), bytes.size ());
+ this_saved_regs[regnum].set_value_bytes (data);
+}
+
+/* See trad-frame.h. */
+
+void
+trad_frame_set_reg_value_bytes (struct trad_frame_cache *this_trad_cache,
+ int regnum,
+ gdb::array_view<const gdb_byte> bytes)
+{
+ /* External interface for users of trad_frame_cache
+ (who cannot access the prev_regs object directly). */
+ trad_frame_set_value_bytes (this_trad_cache->prev_regs, regnum, bytes);
+}
+
+
+
+struct value *
+trad_frame_get_prev_register (struct frame_info *this_frame,
+ trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ if (trad_frame_addr_p (this_saved_regs, regnum))
+ /* The register was saved in memory. */
+ return frame_unwind_got_memory (this_frame, regnum,
+ this_saved_regs[regnum].addr ());
+ else if (trad_frame_realreg_p (this_saved_regs, regnum))
+ return frame_unwind_got_register (this_frame, regnum,
+ this_saved_regs[regnum].realreg ());
+ else if (trad_frame_value_p (this_saved_regs, regnum))
+ /* The register's value is available. */
+ return frame_unwind_got_constant (this_frame, regnum,
+ this_saved_regs[regnum].value ());
+ else if (trad_frame_value_bytes_p (this_saved_regs, regnum))
+ /* The register's value is available as a sequence of bytes. */
+ return frame_unwind_got_bytes (this_frame, regnum,
+ this_saved_regs[regnum].value_bytes ());
else
- {
- /* The register's value is available. */
- *optimizedp = 0;
- *lvalp = not_lval;
- *addrp = 0;
- *realnump = -1;
- if (bufferp != NULL)
- store_unsigned_integer (bufferp, register_size (gdbarch, regnum),
- this_saved_regs[regnum].addr);
- }
+ return frame_unwind_got_optimized (this_frame, regnum);
+}
+
+struct value *
+trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
+ struct frame_info *this_frame,
+ int regnum)
+{
+ return trad_frame_get_prev_register (this_frame, this_trad_cache->prev_regs,
+ regnum);
+}
+
+void
+trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
+ struct frame_id this_id)
+{
+ this_trad_cache->this_id = this_id;
+}
+
+void
+trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
+ struct frame_id *this_id)
+{
+ (*this_id) = this_trad_cache->this_id;
+}
+
+void
+trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
+ CORE_ADDR this_base)
+{
+ this_trad_cache->this_base = this_base;
+}
+
+CORE_ADDR
+trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache)
+{
+ return this_trad_cache->this_base;
}
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