/* Traditional frame unwind support, for GDB the GNU Debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#include "trad-frame.h"
#include "regcache.h"
+struct trad_frame_cache
+{
+ struct frame_info *next_frame;
+ CORE_ADDR this_base;
+ struct trad_frame_saved_reg *prev_regs;
+ struct frame_id this_id;
+};
+
+struct trad_frame_cache *
+trad_frame_cache_zalloc (struct frame_info *next_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 (next_frame);
+ this_trad_cache->next_frame = next_frame;
+ return this_trad_cache;
+}
+
/* 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 *
+struct trad_frame_saved_reg *
trad_frame_alloc_saved_regs (struct frame_info *next_frame)
{
- int i;
+ int regnum;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
int numregs = NUM_REGS + NUM_PSEUDO_REGS;
- struct trad_frame *this_saved_regs
- = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame);
- for (i = 0; i < numregs; i++)
- this_saved_regs[i].regnum = i;
+ 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].realreg = regnum;
+ this_saved_regs[regnum].addr = -1;
+ }
return this_saved_regs;
}
+enum { REG_VALUE = -1, REG_UNKNOWN = -2 };
+
+int
+trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
+{
+ return (this_saved_regs[regnum].realreg == REG_VALUE);
+}
+
+int
+trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
+{
+ return (this_saved_regs[regnum].realreg >= 0
+ && this_saved_regs[regnum].addr != -1);
+}
+
+int
+trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ return (this_saved_regs[regnum].realreg >= 0
+ && this_saved_regs[regnum].addr == -1);
+}
+
void
-trad_frame_register_value (struct trad_frame this_saved_regs[],
- int regnum, LONGEST val)
+trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum, LONGEST val)
{
- /* Make the REGNUM invalid, indicating that the ADDR contains the
+ /* Make the REALREG invalid, indicating that the ADDR contains the
register's value. */
- this_saved_regs[regnum].regnum = -1;
+ this_saved_regs[regnum].realreg = REG_VALUE;
this_saved_regs[regnum].addr = val;
}
void
-trad_frame_prev_register (struct frame_info *next_frame,
- struct trad_frame this_saved_regs[],
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp)
+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)
+{
+ this_trad_cache->prev_regs[regnum].realreg = realreg;
+ this_trad_cache->prev_regs[regnum].addr = -1;
+}
+
+void
+trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
+ int regnum, CORE_ADDR addr)
+{
+ this_trad_cache->prev_regs[regnum].addr = addr;
+}
+
+void
+trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum)
+{
+ /* Make the REALREG invalid, indicating that the value is not known. */
+ this_saved_regs[regnum].realreg = REG_UNKNOWN;
+ this_saved_regs[regnum].addr = -1;
+}
+
+void
+trad_frame_get_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 *realregp, gdb_byte *bufferp)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
- if (this_saved_regs[regnum].regnum >= 0
- && this_saved_regs[regnum].addr != 0)
+ if (trad_frame_addr_p (this_saved_regs, regnum))
{
- /* The register was saved on the stack, fetch it. */
+ /* The register was saved in memory. */
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = this_saved_regs[regnum].addr;
- *realnump = -1;
+ *realregp = -1;
if (bufferp != NULL)
{
/* Read the value in from memory. */
register_size (gdbarch, regnum));
}
}
- else if (this_saved_regs[regnum].regnum >= 0
- && this_saved_regs[regnum].addr == 0)
+ else if (trad_frame_realreg_p (this_saved_regs, regnum))
{
- /* As the next frame to return the value of the register. */
- frame_register_unwind (next_frame, this_saved_regs[regnum].regnum,
- optimizedp, lvalp, addrp, realnump, bufferp);
+ *optimizedp = 0;
+ *lvalp = lval_register;
+ *addrp = 0;
+ *realregp = this_saved_regs[regnum].realreg;
+ /* Ask the next frame to return the value of the register. */
+ if (bufferp)
+ frame_unwind_register (next_frame, (*realregp), bufferp);
}
- else
+ else if (trad_frame_value_p (this_saved_regs, regnum))
{
/* The register's value is available. */
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
- *realnump = -1;
+ *realregp = -1;
if (bufferp != NULL)
store_unsigned_integer (bufferp, register_size (gdbarch, regnum),
this_saved_regs[regnum].addr);
}
+ else
+ {
+ error (_("Register %s not available"),
+ gdbarch_register_name (gdbarch, regnum));
+ }
+}
+
+void
+trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
+ struct frame_info *next_frame,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realregp, gdb_byte *bufferp)
+{
+ trad_frame_get_prev_register (next_frame, this_trad_cache->prev_regs,
+ regnum, optimizedp, lvalp, addrp, realregp,
+ bufferp);
+}
+
+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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