/* Register support routines for the remote server for GDB.
- Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2013 Free Software Foundation, Inc.
This file is part of GDB.
#include "server.h"
#include "regdef.h"
+#include "gdbthread.h"
+#include "tdesc.h"
#include <stdlib.h>
#include <string.h>
-/* The private data for the register cache. Note that we have one
- per inferior; this is primarily for simplicity, as the performance
- benefit is minimal. */
+#ifndef IN_PROCESS_AGENT
-struct inferior_regcache_data
+struct regcache *
+get_thread_regcache (struct thread_info *thread, int fetch)
{
- int registers_valid;
- unsigned char *registers;
-};
+ struct regcache *regcache;
-static int register_bytes;
+ regcache = (struct regcache *) inferior_regcache_data (thread);
-static struct reg *reg_defs;
-static int num_registers;
-
-const char **gdbserver_expedite_regs;
-
-static struct inferior_regcache_data *
-get_regcache (struct thread_info *inf, int fetch)
-{
- struct inferior_regcache_data *regcache;
+ /* Threads' regcaches are created lazily, because biarch targets add
+ the main thread/lwp before seeing it stop for the first time, and
+ it is only after the target sees the thread stop for the first
+ time that the target has a chance of determining the process's
+ architecture. IOW, when we first add the process's main thread
+ we don't know which architecture/tdesc its regcache should
+ have. */
+ if (regcache == NULL)
+ {
+ struct process_info *proc = get_thread_process (thread);
- regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf);
+ if (proc->tdesc == NULL)
+ fatal ("no target description");
- if (regcache == NULL)
- fatal ("no register cache");
+ regcache = new_register_cache (proc->tdesc);
+ set_inferior_regcache_data (thread, regcache);
+ }
- /* FIXME - fetch registers for INF */
if (fetch && regcache->registers_valid == 0)
{
- fetch_inferior_registers (0);
+ struct thread_info *saved_inferior = current_inferior;
+
+ current_inferior = thread;
+ fetch_inferior_registers (regcache, -1);
+ current_inferior = saved_inferior;
regcache->registers_valid = 1;
}
}
void
-regcache_invalidate_one (struct inferior_list_entry *entry)
+regcache_invalidate_thread (struct thread_info *thread)
{
- struct thread_info *thread = (struct thread_info *) entry;
- struct inferior_regcache_data *regcache;
+ struct regcache *regcache;
+
+ regcache = (struct regcache *) inferior_regcache_data (thread);
- regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread);
+ if (regcache == NULL)
+ return;
if (regcache->registers_valid)
{
struct thread_info *saved_inferior = current_inferior;
current_inferior = thread;
- store_inferior_registers (-1);
+ store_inferior_registers (regcache, -1);
current_inferior = saved_inferior;
}
regcache->registers_valid = 0;
}
-void
-regcache_invalidate ()
+static int
+regcache_invalidate_one (struct inferior_list_entry *entry,
+ void *pid_p)
{
- for_each_inferior (&all_threads, regcache_invalidate_one);
+ struct thread_info *thread = (struct thread_info *) entry;
+ int pid = *(int *) pid_p;
+
+ /* Only invalidate the regcaches of threads of this process. */
+ if (ptid_get_pid (entry->id) == pid)
+ regcache_invalidate_thread (thread);
+
+ return 0;
}
-void *
-new_register_cache (void)
+void
+regcache_invalidate (void)
{
- struct inferior_regcache_data *regcache;
+ /* Only update the threads of the current process. */
+ int pid = ptid_get_pid (current_inferior->entry.id);
- if (register_bytes == 0)
- return NULL; /* The architecture hasn't been initialized yet. */
+ find_inferior (&all_threads, regcache_invalidate_one, &pid);
+}
- regcache = malloc (sizeof (*regcache));
+#endif
- /* Make sure to zero-initialize the register cache when it is created,
- in case there are registers the target never fetches. This way they'll
- read as zero instead of garbage. */
- regcache->registers = calloc (1, register_bytes);
- if (regcache->registers == NULL)
- fatal ("Could not allocate register cache.");
+struct regcache *
+init_register_cache (struct regcache *regcache,
+ const struct target_desc *tdesc,
+ unsigned char *regbuf)
+{
+#ifndef IN_PROCESS_AGENT
+ if (regbuf == NULL)
+ {
+ /* Make sure to zero-initialize the register cache when it is
+ created, in case there are registers the target never
+ fetches. This way they'll read as zero instead of
+ garbage. */
+ regcache->tdesc = tdesc;
+ regcache->registers = xcalloc (1, tdesc->registers_size);
+ regcache->registers_owned = 1;
+ regcache->register_status = xcalloc (1, tdesc->num_registers);
+ gdb_assert (REG_UNAVAILABLE == 0);
+ }
+ else
+#else
+ if (regbuf == NULL)
+ fatal ("init_register_cache: can't allocate memory from the heap");
+ else
+#endif
+ {
+ regcache->tdesc = tdesc;
+ regcache->registers = regbuf;
+ regcache->registers_owned = 0;
+#ifndef IN_PROCESS_AGENT
+ regcache->register_status = NULL;
+#endif
+ }
regcache->registers_valid = 0;
return regcache;
}
-void
-free_register_cache (void *regcache_p)
+#ifndef IN_PROCESS_AGENT
+
+struct regcache *
+new_register_cache (const struct target_desc *tdesc)
{
- struct inferior_regcache_data *regcache
- = (struct inferior_regcache_data *) regcache_p;
+ struct regcache *regcache;
+ gdb_assert (tdesc->registers_size != 0);
+
+ regcache = xmalloc (sizeof (*regcache));
+ return init_register_cache (regcache, tdesc, NULL);
+}
+
+void
+free_register_cache (struct regcache *regcache)
+{
if (regcache)
{
- free (regcache->registers);
+ if (regcache->registers_owned)
+ free (regcache->registers);
+ free (regcache->register_status);
free (regcache);
}
}
-static void
-realloc_register_cache (struct inferior_list_entry *thread_p)
-{
- struct thread_info *thread = (struct thread_info *) thread_p;
-
- free_register_cache (inferior_regcache_data (thread));
- set_inferior_regcache_data (thread, new_register_cache ());
-}
+#endif
void
-set_register_cache (struct reg *regs, int n)
+regcache_cpy (struct regcache *dst, struct regcache *src)
{
- int offset, i;
-
- reg_defs = regs;
- num_registers = n;
-
- offset = 0;
- for (i = 0; i < n; i++)
- {
- regs[i].offset = offset;
- offset += regs[i].size;
- }
-
- register_bytes = offset / 8;
+ gdb_assert (src != NULL && dst != NULL);
+ gdb_assert (src->tdesc == dst->tdesc);
+ gdb_assert (src != dst);
+
+ memcpy (dst->registers, src->registers, src->tdesc->registers_size);
+#ifndef IN_PROCESS_AGENT
+ if (dst->register_status != NULL && src->register_status != NULL)
+ memcpy (dst->register_status, src->register_status,
+ src->tdesc->num_registers);
+#endif
+ dst->registers_valid = src->registers_valid;
+}
- /* Make sure PBUFSIZ is large enough to hold a full register packet. */
- if (2 * register_bytes + 32 > PBUFSIZ)
- fatal ("Register packet size exceeds PBUFSIZ.");
- /* Re-allocate all pre-existing register caches. */
- for_each_inferior (&all_threads, realloc_register_cache);
-}
+#ifndef IN_PROCESS_AGENT
void
-registers_to_string (char *buf)
+registers_to_string (struct regcache *regcache, char *buf)
{
- unsigned char *registers = get_regcache (current_inferior, 1)->registers;
+ unsigned char *registers = regcache->registers;
+ const struct target_desc *tdesc = regcache->tdesc;
+ int i;
- convert_int_to_ascii (registers, buf, register_bytes);
+ for (i = 0; i < tdesc->num_registers; i++)
+ {
+ if (regcache->register_status[i] == REG_VALID)
+ {
+ convert_int_to_ascii (registers, buf,
+ register_size (tdesc, i));
+ buf += register_size (tdesc, i) * 2;
+ }
+ else
+ {
+ memset (buf, 'x', register_size (tdesc, i) * 2);
+ buf += register_size (tdesc, i) * 2;
+ }
+ registers += register_size (tdesc, i);
+ }
+ *buf = '\0';
}
void
-registers_from_string (char *buf)
+registers_from_string (struct regcache *regcache, char *buf)
{
int len = strlen (buf);
- unsigned char *registers = get_regcache (current_inferior, 1)->registers;
+ unsigned char *registers = regcache->registers;
+ const struct target_desc *tdesc = regcache->tdesc;
- if (len != register_bytes * 2)
+ if (len != tdesc->registers_size * 2)
{
- warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len);
- if (len > register_bytes * 2)
- len = register_bytes * 2;
+ warning ("Wrong sized register packet (expected %d bytes, got %d)",
+ 2 * tdesc->registers_size, len);
+ if (len > tdesc->registers_size * 2)
+ len = tdesc->registers_size * 2;
}
convert_ascii_to_int (buf, registers, len / 2);
}
struct reg *
-find_register_by_name (const char *name)
+find_register_by_name (const struct target_desc *tdesc, const char *name)
{
int i;
- for (i = 0; i < num_registers; i++)
- if (!strcmp (name, reg_defs[i].name))
- return ®_defs[i];
+ for (i = 0; i < tdesc->num_registers; i++)
+ if (strcmp (name, tdesc->reg_defs[i].name) == 0)
+ return &tdesc->reg_defs[i];
fatal ("Unknown register %s requested", name);
return 0;
}
int
-find_regno (const char *name)
+find_regno (const struct target_desc *tdesc, const char *name)
{
int i;
- for (i = 0; i < num_registers; i++)
- if (!strcmp (name, reg_defs[i].name))
+ for (i = 0; i < tdesc->num_registers; i++)
+ if (strcmp (name, tdesc->reg_defs[i].name) == 0)
return i;
fatal ("Unknown register %s requested", name);
return -1;
}
struct reg *
-find_register_by_number (int n)
+find_register_by_number (const struct target_desc *tdesc, int n)
+{
+ return &tdesc->reg_defs[n];
+}
+
+#endif
+
+#ifndef IN_PROCESS_AGENT
+static void
+free_register_cache_thread (struct thread_info *thread)
+{
+ struct regcache *regcache
+ = (struct regcache *) inferior_regcache_data (thread);
+
+ if (regcache != NULL)
+ {
+ regcache_invalidate_thread (thread);
+ free_register_cache (regcache);
+ set_inferior_regcache_data (thread, NULL);
+ }
+}
+
+static void
+free_register_cache_thread_one (struct inferior_list_entry *entry)
+{
+ struct thread_info *thread = (struct thread_info *) entry;
+
+ free_register_cache_thread (thread);
+}
+
+void
+regcache_release (void)
+{
+ /* Flush and release all pre-existing register caches. */
+ for_each_inferior (&all_threads, free_register_cache_thread_one);
+}
+#endif
+
+int
+register_cache_size (const struct target_desc *tdesc)
{
- return ®_defs[n];
+ return tdesc->registers_size;
}
int
-register_size (int n)
+register_size (const struct target_desc *tdesc, int n)
{
- return reg_defs[n].size / 8;
+ return tdesc->reg_defs[n].size / 8;
}
static unsigned char *
-register_data (int n, int fetch)
+register_data (struct regcache *regcache, int n, int fetch)
+{
+ return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
+}
+
+/* Supply register N, whose contents are stored in BUF, to REGCACHE.
+ If BUF is NULL, the register's value is recorded as
+ unavailable. */
+
+void
+supply_register (struct regcache *regcache, int n, const void *buf)
+{
+ if (buf)
+ {
+ memcpy (register_data (regcache, n, 0), buf,
+ register_size (regcache->tdesc, n));
+#ifndef IN_PROCESS_AGENT
+ if (regcache->register_status != NULL)
+ regcache->register_status[n] = REG_VALID;
+#endif
+ }
+ else
+ {
+ memset (register_data (regcache, n, 0), 0,
+ register_size (regcache->tdesc, n));
+#ifndef IN_PROCESS_AGENT
+ if (regcache->register_status != NULL)
+ regcache->register_status[n] = REG_UNAVAILABLE;
+#endif
+ }
+}
+
+/* Supply register N with value zero to REGCACHE. */
+
+void
+supply_register_zeroed (struct regcache *regcache, int n)
{
- unsigned char *registers
- = get_regcache (current_inferior, fetch)->registers;
+ memset (register_data (regcache, n, 0), 0,
+ register_size (regcache->tdesc, n));
+#ifndef IN_PROCESS_AGENT
+ if (regcache->register_status != NULL)
+ regcache->register_status[n] = REG_VALID;
+#endif
+}
+
+/* Supply the whole register set whose contents are stored in BUF, to
+ REGCACHE. If BUF is NULL, all the registers' values are recorded
+ as unavailable. */
+
+void
+supply_regblock (struct regcache *regcache, const void *buf)
+{
+ if (buf)
+ {
+ const struct target_desc *tdesc = regcache->tdesc;
+
+ memcpy (regcache->registers, buf, tdesc->registers_size);
+#ifndef IN_PROCESS_AGENT
+ {
+ int i;
+
+ for (i = 0; i < tdesc->num_registers; i++)
+ regcache->register_status[i] = REG_VALID;
+ }
+#endif
+ }
+ else
+ {
+ const struct target_desc *tdesc = regcache->tdesc;
+
+ memset (regcache->registers, 0, tdesc->registers_size);
+#ifndef IN_PROCESS_AGENT
+ {
+ int i;
- return registers + (reg_defs[n].offset / 8);
+ for (i = 0; i < tdesc->num_registers; i++)
+ regcache->register_status[i] = REG_UNAVAILABLE;
+ }
+#endif
+ }
}
+#ifndef IN_PROCESS_AGENT
+
void
-supply_register (int n, const void *buf)
+supply_register_by_name (struct regcache *regcache,
+ const char *name, const void *buf)
{
- memcpy (register_data (n, 0), buf, register_size (n));
+ supply_register (regcache, find_regno (regcache->tdesc, name), buf);
}
+#endif
+
void
-supply_register_by_name (const char *name, const void *buf)
+collect_register (struct regcache *regcache, int n, void *buf)
{
- supply_register (find_regno (name), buf);
+ memcpy (buf, register_data (regcache, n, 1),
+ register_size (regcache->tdesc, n));
}
+#ifndef IN_PROCESS_AGENT
+
void
-collect_register (int n, void *buf)
+collect_register_as_string (struct regcache *regcache, int n, char *buf)
{
- memcpy (buf, register_data (n, 1), register_size (n));
+ convert_int_to_ascii (register_data (regcache, n, 1), buf,
+ register_size (regcache->tdesc, n));
}
void
-collect_register_as_string (int n, char *buf)
+collect_register_by_name (struct regcache *regcache,
+ const char *name, void *buf)
{
- convert_int_to_ascii (register_data (n, 1), buf, register_size (n));
+ collect_register (regcache, find_regno (regcache->tdesc, name), buf);
+}
+
+/* Special handling for register PC. */
+
+CORE_ADDR
+regcache_read_pc (struct regcache *regcache)
+{
+ CORE_ADDR pc_val;
+
+ if (the_target->read_pc)
+ pc_val = the_target->read_pc (regcache);
+ else
+ internal_error (__FILE__, __LINE__,
+ "regcache_read_pc: Unable to find PC");
+
+ return pc_val;
}
void
-collect_register_by_name (const char *name, void *buf)
+regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- collect_register (find_regno (name), buf);
+ if (the_target->write_pc)
+ the_target->write_pc (regcache, pc);
+ else
+ internal_error (__FILE__, __LINE__,
+ "regcache_write_pc: Unable to update PC");
}
+
+#endif
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