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Diffstat (limited to 'gdb/regcache.c')
| -rw-r--r-- | gdb/regcache.c | 1440 |
1 files changed, 0 insertions, 1440 deletions
diff --git a/gdb/regcache.c b/gdb/regcache.c deleted file mode 100644 index 37092f82551..00000000000 --- a/gdb/regcache.c +++ /dev/null @@ -1,1440 +0,0 @@ -/* Cache and manage the values of registers for GDB, the GNU debugger. - - Copyright (C) 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001, - 2002, 2004, 2007, 2008, 2009, 2010, 2011 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 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - 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, see <http://www.gnu.org/licenses/>. */ - -#include "defs.h" -#include "inferior.h" -#include "target.h" -#include "gdbarch.h" -#include "gdbcmd.h" -#include "regcache.h" -#include "reggroups.h" -#include "gdb_assert.h" -#include "gdb_string.h" -#include "gdbcmd.h" /* For maintenanceprintlist. */ -#include "observer.h" -#include "exceptions.h" -#include "remote.h" - -/* - * DATA STRUCTURE - * - * Here is the actual register cache. - */ - -/* Per-architecture object describing the layout of a register cache. - Computed once when the architecture is created. */ - -struct gdbarch_data *regcache_descr_handle; - -struct regcache_descr -{ - /* The architecture this descriptor belongs to. */ - struct gdbarch *gdbarch; - - /* The raw register cache. Each raw (or hard) register is supplied - by the target interface. The raw cache should not contain - redundant information - if the PC is constructed from two - registers then those registers and not the PC lives in the raw - cache. */ - int nr_raw_registers; - long sizeof_raw_registers; - long sizeof_raw_register_status; - - /* The cooked register space. Each cooked register in the range - [0..NR_RAW_REGISTERS) is direct-mapped onto the corresponding raw - register. The remaining [NR_RAW_REGISTERS - .. NR_COOKED_REGISTERS) (a.k.a. pseudo registers) are mapped onto - both raw registers and memory by the architecture methods - gdbarch_pseudo_register_read and gdbarch_pseudo_register_write. */ - int nr_cooked_registers; - long sizeof_cooked_registers; - long sizeof_cooked_register_status; - - /* Offset and size (in 8 bit bytes), of each register in the - register cache. All registers (including those in the range - [NR_RAW_REGISTERS .. NR_COOKED_REGISTERS) are given an - offset. */ - long *register_offset; - long *sizeof_register; - - /* Cached table containing the type of each register. */ - struct type **register_type; -}; - -static void * -init_regcache_descr (struct gdbarch *gdbarch) -{ - int i; - struct regcache_descr *descr; - gdb_assert (gdbarch != NULL); - - /* Create an initial, zero filled, table. */ - descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct regcache_descr); - descr->gdbarch = gdbarch; - - /* Total size of the register space. The raw registers are mapped - directly onto the raw register cache while the pseudo's are - either mapped onto raw-registers or memory. */ - descr->nr_cooked_registers = gdbarch_num_regs (gdbarch) - + gdbarch_num_pseudo_regs (gdbarch); - descr->sizeof_cooked_register_status - = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); - - /* Fill in a table of register types. */ - descr->register_type - = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, - struct type *); - for (i = 0; i < descr->nr_cooked_registers; i++) - descr->register_type[i] = gdbarch_register_type (gdbarch, i); - - /* Construct a strictly RAW register cache. Don't allow pseudo's - into the register cache. */ - descr->nr_raw_registers = gdbarch_num_regs (gdbarch); - descr->sizeof_raw_register_status = gdbarch_num_regs (gdbarch); - - /* Lay out the register cache. - - NOTE: cagney/2002-05-22: Only register_type() is used when - constructing the register cache. It is assumed that the - register's raw size, virtual size and type length are all the - same. */ - - { - long offset = 0; - - descr->sizeof_register - = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long); - descr->register_offset - = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long); - for (i = 0; i < descr->nr_raw_registers; i++) - { - descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]); - descr->register_offset[i] = offset; - offset += descr->sizeof_register[i]; - gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]); - } - /* Set the real size of the raw register cache buffer. */ - descr->sizeof_raw_registers = offset; - - for (; i < descr->nr_cooked_registers; i++) - { - descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]); - descr->register_offset[i] = offset; - offset += descr->sizeof_register[i]; - gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]); - } - /* Set the real size of the readonly register cache buffer. */ - descr->sizeof_cooked_registers = offset; - } - - return descr; -} - -static struct regcache_descr * -regcache_descr (struct gdbarch *gdbarch) -{ - return gdbarch_data (gdbarch, regcache_descr_handle); -} - -/* Utility functions returning useful register attributes stored in - the regcache descr. */ - -struct type * -register_type (struct gdbarch *gdbarch, int regnum) -{ - struct regcache_descr *descr = regcache_descr (gdbarch); - - gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); - return descr->register_type[regnum]; -} - -/* Utility functions returning useful register attributes stored in - the regcache descr. */ - -int -register_size (struct gdbarch *gdbarch, int regnum) -{ - struct regcache_descr *descr = regcache_descr (gdbarch); - int size; - - gdb_assert (regnum >= 0 - && regnum < (gdbarch_num_regs (gdbarch) - + gdbarch_num_pseudo_regs (gdbarch))); - size = descr->sizeof_register[regnum]; - return size; -} - -/* The register cache for storing raw register values. */ - -struct regcache -{ - struct regcache_descr *descr; - - /* The address space of this register cache (for registers where it - makes sense, like PC or SP). */ - struct address_space *aspace; - - /* The register buffers. A read-only register cache can hold the - full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write - register cache can only hold [0 .. gdbarch_num_regs). */ - gdb_byte *registers; - /* Register cache status. */ - signed char *register_status; - /* Is this a read-only cache? A read-only cache is used for saving - the target's register state (e.g, across an inferior function - call or just before forcing a function return). A read-only - cache can only be updated via the methods regcache_dup() and - regcache_cpy(). The actual contents are determined by the - reggroup_save and reggroup_restore methods. */ - int readonly_p; - /* If this is a read-write cache, which thread's registers is - it connected to? */ - ptid_t ptid; -}; - -static struct regcache * -regcache_xmalloc_1 (struct gdbarch *gdbarch, struct address_space *aspace, - int readonly_p) -{ - struct regcache_descr *descr; - struct regcache *regcache; - - gdb_assert (gdbarch != NULL); - descr = regcache_descr (gdbarch); - regcache = XMALLOC (struct regcache); - regcache->descr = descr; - regcache->readonly_p = readonly_p; - if (readonly_p) - { - regcache->registers - = XCALLOC (descr->sizeof_cooked_registers, gdb_byte); - regcache->register_status - = XCALLOC (descr->sizeof_cooked_register_status, gdb_byte); - } - else - { - regcache->registers - = XCALLOC (descr->sizeof_raw_registers, gdb_byte); - regcache->register_status - = XCALLOC (descr->sizeof_raw_register_status, gdb_byte); - } - regcache->aspace = aspace; - regcache->ptid = minus_one_ptid; - return regcache; -} - -struct regcache * -regcache_xmalloc (struct gdbarch *gdbarch, struct address_space *aspace) -{ - return regcache_xmalloc_1 (gdbarch, aspace, 1); -} - -void -regcache_xfree (struct regcache *regcache) -{ - if (regcache == NULL) - return; - xfree (regcache->registers); - xfree (regcache->register_status); - xfree (regcache); -} - -static void -do_regcache_xfree (void *data) -{ - regcache_xfree (data); -} - -struct cleanup * -make_cleanup_regcache_xfree (struct regcache *regcache) -{ - return make_cleanup (do_regcache_xfree, regcache); -} - -/* Return REGCACHE's architecture. */ - -struct gdbarch * -get_regcache_arch (const struct regcache *regcache) -{ - return regcache->descr->gdbarch; -} - -struct address_space * -get_regcache_aspace (const struct regcache *regcache) -{ - return regcache->aspace; -} - -/* Return a pointer to register REGNUM's buffer cache. */ - -static gdb_byte * -register_buffer (const struct regcache *regcache, int regnum) -{ - return regcache->registers + regcache->descr->register_offset[regnum]; -} - -void -regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read, - void *src) -{ - struct gdbarch *gdbarch = dst->descr->gdbarch; - gdb_byte buf[MAX_REGISTER_SIZE]; - int regnum; - - /* The DST should be `read-only', if it wasn't then the save would - end up trying to write the register values back out to the - target. */ - gdb_assert (dst->readonly_p); - /* Clear the dest. */ - memset (dst->registers, 0, dst->descr->sizeof_cooked_registers); - memset (dst->register_status, 0, - dst->descr->sizeof_cooked_register_status); - /* Copy over any registers (identified by their membership in the - save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs + - gdbarch_num_pseudo_regs) range is checked since some architectures need - to save/restore `cooked' registers that live in memory. */ - for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++) - { - if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup)) - { - enum register_status status = cooked_read (src, regnum, buf); - - if (status == REG_VALID) - memcpy (register_buffer (dst, regnum), buf, - register_size (gdbarch, regnum)); - else - { - gdb_assert (status != REG_UNKNOWN); - - memset (register_buffer (dst, regnum), 0, - register_size (gdbarch, regnum)); - } - dst->register_status[regnum] = status; - } - } -} - -void -regcache_restore (struct regcache *dst, - regcache_cooked_read_ftype *cooked_read, - void *cooked_read_context) -{ - struct gdbarch *gdbarch = dst->descr->gdbarch; - gdb_byte buf[MAX_REGISTER_SIZE]; - int regnum; - - /* The dst had better not be read-only. If it is, the `restore' - doesn't make much sense. */ - gdb_assert (!dst->readonly_p); - /* Copy over any registers, being careful to only restore those that - were both saved and need to be restored. The full [0 .. gdbarch_num_regs - + gdbarch_num_pseudo_regs) range is checked since some architectures need - to save/restore `cooked' registers that live in memory. */ - for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++) - { - if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup)) - { - int valid = cooked_read (cooked_read_context, regnum, buf); - - if (valid) - regcache_cooked_write (dst, regnum, buf); - } - } -} - -static enum register_status -do_cooked_read (void *src, int regnum, gdb_byte *buf) -{ - struct regcache *regcache = src; - - return regcache_cooked_read (regcache, regnum, buf); -} - -void -regcache_cpy (struct regcache *dst, struct regcache *src) -{ - gdb_assert (src != NULL && dst != NULL); - gdb_assert (src->descr->gdbarch == dst->descr->gdbarch); - gdb_assert (src != dst); - gdb_assert (src->readonly_p || dst->readonly_p); - - if (!src->readonly_p) - regcache_save (dst, do_cooked_read, src); - else if (!dst->readonly_p) - regcache_restore (dst, do_cooked_read, src); - else - regcache_cpy_no_passthrough (dst, src); -} - -void -regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src) -{ - gdb_assert (src != NULL && dst != NULL); - gdb_assert (src->descr->gdbarch == dst->descr->gdbarch); - /* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough - move of data into a thread's regcache. Doing this would be silly - - it would mean that regcache->register_status would be - completely invalid. */ - gdb_assert (dst->readonly_p && src->readonly_p); - - memcpy (dst->registers, src->registers, - dst->descr->sizeof_cooked_registers); - memcpy (dst->register_status, src->register_status, - dst->descr->sizeof_cooked_register_status); -} - -struct regcache * -regcache_dup (struct regcache *src) -{ - struct regcache *newbuf; - - newbuf = regcache_xmalloc (src->descr->gdbarch, get_regcache_aspace (src)); - regcache_cpy (newbuf, src); - return newbuf; -} - -int -regcache_register_status (const struct regcache *regcache, int regnum) -{ - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0); - if (regcache->readonly_p) - gdb_assert (regnum < regcache->descr->nr_cooked_registers); - else - gdb_assert (regnum < regcache->descr->nr_raw_registers); - - return regcache->register_status[regnum]; -} - -void -regcache_invalidate (struct regcache *regcache, int regnum) -{ - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0); - gdb_assert (!regcache->readonly_p); - gdb_assert (regnum < regcache->descr->nr_raw_registers); - regcache->register_status[regnum] = REG_UNKNOWN; -} - - -/* Global structure containing the current regcache. */ - -/* NOTE: this is a write-through cache. There is no "dirty" bit for - recording if the register values have been changed (eg. by the - user). Therefore all registers must be written back to the - target when appropriate. */ - -struct regcache_list -{ - struct regcache *regcache; - struct regcache_list *next; -}; - -static struct regcache_list *current_regcache; - -struct regcache * -get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch, - struct address_space *aspace) -{ - struct regcache_list *list; - struct regcache *new_regcache; - - for (list = current_regcache; list; list = list->next) - if (ptid_equal (list->regcache->ptid, ptid) - && get_regcache_arch (list->regcache) == gdbarch) - return list->regcache; - - new_regcache = regcache_xmalloc_1 (gdbarch, aspace, 0); - new_regcache->ptid = ptid; - - list = xmalloc (sizeof (struct regcache_list)); - list->regcache = new_regcache; - list->next = current_regcache; - current_regcache = list; - - return new_regcache; -} - -struct regcache * -get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch) -{ - struct address_space *aspace; - - /* For the benefit of "maint print registers" & co when debugging an - executable, allow dumping the regcache even when there is no - thread selected (target_thread_address_space internal-errors if - no address space is found). Note that normal user commands will - fail higher up on the call stack due to no - target_has_registers. */ - aspace = (ptid_equal (null_ptid, ptid) - ? NULL - : target_thread_address_space (ptid)); - - return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace); -} - -static ptid_t current_thread_ptid; -static struct gdbarch *current_thread_arch; - -struct regcache * -get_thread_regcache (ptid_t ptid) -{ - if (!current_thread_arch || !ptid_equal (current_thread_ptid, ptid)) - { - current_thread_ptid = ptid; - current_thread_arch = target_thread_architecture (ptid); - } - - return get_thread_arch_regcache (ptid, current_thread_arch); -} - -struct regcache * -get_current_regcache (void) -{ - return get_thread_regcache (inferior_ptid); -} - - -/* Observer for the target_changed event. */ - -static void -regcache_observer_target_changed (struct target_ops *target) -{ - registers_changed (); -} - -/* Update global variables old ptids to hold NEW_PTID if they were - holding OLD_PTID. */ -static void -regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) -{ - struct regcache_list *list; - - for (list = current_regcache; list; list = list->next) - if (ptid_equal (list->regcache->ptid, old_ptid)) - list->regcache->ptid = new_ptid; -} - -/* Low level examining and depositing of registers. - - The caller is responsible for making sure that the inferior is - stopped before calling the fetching routines, or it will get - garbage. (a change from GDB version 3, in which the caller got the - value from the last stop). */ - -/* REGISTERS_CHANGED () - - Indicate that registers may have changed, so invalidate the cache. */ - -void -registers_changed_ptid (ptid_t ptid) -{ - struct regcache_list *list, **list_link; - int wildcard = ptid_equal (ptid, minus_one_ptid); - - list = current_regcache; - list_link = ¤t_regcache; - while (list) - { - if (ptid_match (list->regcache->ptid, ptid)) - { - struct regcache_list *dead = list; - - *list_link = list->next; - regcache_xfree (list->regcache); - list = *list_link; - xfree (dead); - continue; - } - - list_link = &list->next; - list = *list_link; - } - - if (wildcard || ptid_equal (ptid, current_thread_ptid)) - { - current_thread_ptid = null_ptid; - current_thread_arch = NULL; - } - - if (wildcard || ptid_equal (ptid, inferior_ptid)) - { - /* We just deleted the regcache of the current thread. Need to - forget about any frames we have cached, too. */ - reinit_frame_cache (); - } -} - -void -registers_changed (void) -{ - registers_changed_ptid (minus_one_ptid); - - /* Force cleanup of any alloca areas if using C alloca instead of - a builtin alloca. This particular call is used to clean up - areas allocated by low level target code which may build up - during lengthy interactions between gdb and the target before - gdb gives control to the user (ie watchpoints). */ - alloca (0); -} - -enum register_status -regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf) -{ - gdb_assert (regcache != NULL && buf != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - /* Make certain that the register cache is up-to-date with respect - to the current thread. This switching shouldn't be necessary - only there is still only one target side register cache. Sigh! - On the bright side, at least there is a regcache object. */ - if (!regcache->readonly_p - && regcache_register_status (regcache, regnum) == REG_UNKNOWN) - { - struct cleanup *old_chain = save_inferior_ptid (); - - inferior_ptid = regcache->ptid; - target_fetch_registers (regcache, regnum); - do_cleanups (old_chain); - - /* A number of targets can't access the whole set of raw - registers (because the debug API provides no means to get at - them). */ - if (regcache->register_status[regnum] == REG_UNKNOWN) - regcache->register_status[regnum] = REG_UNAVAILABLE; - } - - if (regcache->register_status[regnum] != REG_VALID) - memset (buf, 0, regcache->descr->sizeof_register[regnum]); - else - memcpy (buf, register_buffer (regcache, regnum), - regcache->descr->sizeof_register[regnum]); - - return regcache->register_status[regnum]; -} - -enum register_status -regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val) -{ - gdb_byte *buf; - enum register_status status; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - status = regcache_raw_read (regcache, regnum, buf); - if (status == REG_VALID) - *val = extract_signed_integer - (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch)); - else - *val = 0; - return status; -} - -enum register_status -regcache_raw_read_unsigned (struct regcache *regcache, int regnum, - ULONGEST *val) -{ - gdb_byte *buf; - enum register_status status; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - status = regcache_raw_read (regcache, regnum, buf); - if (status == REG_VALID) - *val = extract_unsigned_integer - (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch)); - else - *val = 0; - return status; -} - -void -regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val) -{ - void *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - store_signed_integer (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch), val); - regcache_raw_write (regcache, regnum, buf); -} - -void -regcache_raw_write_unsigned (struct regcache *regcache, int regnum, - ULONGEST val) -{ - void *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch), val); - regcache_raw_write (regcache, regnum, buf); -} - -enum register_status -regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf) -{ - gdb_assert (regnum >= 0); - gdb_assert (regnum < regcache->descr->nr_cooked_registers); - if (regnum < regcache->descr->nr_raw_registers) - return regcache_raw_read (regcache, regnum, buf); - else if (regcache->readonly_p - && regcache->register_status[regnum] != REG_UNKNOWN) - { - /* Read-only register cache, perhaps the cooked value was - cached? */ - struct gdbarch *gdbarch = regcache->descr->gdbarch; - - if (regcache->register_status[regnum] == REG_VALID) - memcpy (buf, register_buffer (regcache, regnum), - regcache->descr->sizeof_register[regnum]); - else - memset (buf, 0, regcache->descr->sizeof_register[regnum]); - - return regcache->register_status[regnum]; - } - else if (gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch)) - { - struct value *mark, *computed; - enum register_status result = REG_VALID; - - mark = value_mark (); - - computed = gdbarch_pseudo_register_read_value (regcache->descr->gdbarch, - regcache, regnum); - if (value_entirely_available (computed)) - memcpy (buf, value_contents_raw (computed), - regcache->descr->sizeof_register[regnum]); - else - { - memset (buf, 0, regcache->descr->sizeof_register[regnum]); - result = REG_UNAVAILABLE; - } - - value_free_to_mark (mark); - - return result; - } - else - return gdbarch_pseudo_register_read (regcache->descr->gdbarch, regcache, - regnum, buf); -} - -struct value * -regcache_cooked_read_value (struct regcache *regcache, int regnum) -{ - gdb_assert (regnum >= 0); - gdb_assert (regnum < regcache->descr->nr_cooked_registers); - - if (regnum < regcache->descr->nr_raw_registers - || (regcache->readonly_p - && regcache->register_status[regnum] != REG_UNKNOWN) - || !gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch)) - { - struct value *result; - - result = allocate_value (register_type (regcache->descr->gdbarch, - regnum)); - VALUE_LVAL (result) = lval_register; - VALUE_REGNUM (result) = regnum; - - /* It is more efficient in general to do this delegation in this - direction than in the other one, even though the value-based - API is preferred. */ - if (regcache_cooked_read (regcache, regnum, - value_contents_raw (result)) == REG_UNAVAILABLE) - mark_value_bytes_unavailable (result, 0, - TYPE_LENGTH (value_type (result))); - - return result; - } - else - return gdbarch_pseudo_register_read_value (regcache->descr->gdbarch, - regcache, regnum); -} - -enum register_status -regcache_cooked_read_signed (struct regcache *regcache, int regnum, - LONGEST *val) -{ - enum register_status status; - gdb_byte *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - status = regcache_cooked_read (regcache, regnum, buf); - if (status == REG_VALID) - *val = extract_signed_integer - (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch)); - else - *val = 0; - return status; -} - -enum register_status -regcache_cooked_read_unsigned (struct regcache *regcache, int regnum, - ULONGEST *val) -{ - enum register_status status; - gdb_byte *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - status = regcache_cooked_read (regcache, regnum, buf); - if (status == REG_VALID) - *val = extract_unsigned_integer - (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch)); - else - *val = 0; - return status; -} - -void -regcache_cooked_write_signed (struct regcache *regcache, int regnum, - LONGEST val) -{ - void *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - store_signed_integer (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch), val); - regcache_cooked_write (regcache, regnum, buf); -} - -void -regcache_cooked_write_unsigned (struct regcache *regcache, int regnum, - ULONGEST val) -{ - void *buf; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers); - buf = alloca (regcache->descr->sizeof_register[regnum]); - store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum], - gdbarch_byte_order (regcache->descr->gdbarch), val); - regcache_cooked_write (regcache, regnum, buf); -} - -void -regcache_raw_write (struct regcache *regcache, int regnum, - const gdb_byte *buf) -{ - struct cleanup *old_chain; - - gdb_assert (regcache != NULL && buf != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - gdb_assert (!regcache->readonly_p); - - /* On the sparc, writing %g0 is a no-op, so we don't even want to - change the registers array if something writes to this register. */ - if (gdbarch_cannot_store_register (get_regcache_arch (regcache), regnum)) - return; - - /* If we have a valid copy of the register, and new value == old - value, then don't bother doing the actual store. */ - if (regcache_register_status (regcache, regnum) == REG_VALID - && (memcmp (register_buffer (regcache, regnum), buf, - regcache->descr->sizeof_register[regnum]) == 0)) - return; - - old_chain = save_inferior_ptid (); - inferior_ptid = regcache->ptid; - - target_prepare_to_store (regcache); - memcpy (register_buffer (regcache, regnum), buf, - regcache->descr->sizeof_register[regnum]); - regcache->register_status[regnum] = REG_VALID; - target_store_registers (regcache, regnum); - - do_cleanups (old_chain); -} - -void -regcache_cooked_write (struct regcache *regcache, int regnum, - const gdb_byte *buf) -{ - gdb_assert (regnum >= 0); - gdb_assert (regnum < regcache->descr->nr_cooked_registers); - if (regnum < regcache->descr->nr_raw_registers) - regcache_raw_write (regcache, regnum, buf); - else - gdbarch_pseudo_register_write (regcache->descr->gdbarch, regcache, - regnum, buf); -} - -/* Perform a partial register transfer using a read, modify, write - operation. */ - -typedef void (regcache_read_ftype) (struct regcache *regcache, int regnum, - void *buf); -typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum, - const void *buf); - -static enum register_status -regcache_xfer_part (struct regcache *regcache, int regnum, - int offset, int len, void *in, const void *out, - enum register_status (*read) (struct regcache *regcache, - int regnum, - gdb_byte *buf), - void (*write) (struct regcache *regcache, int regnum, - const gdb_byte *buf)) -{ - struct regcache_descr *descr = regcache->descr; - gdb_byte reg[MAX_REGISTER_SIZE]; - - gdb_assert (offset >= 0 && offset <= descr->sizeof_register[regnum]); - gdb_assert (len >= 0 && offset + len <= descr->sizeof_register[regnum]); - /* Something to do? */ - if (offset + len == 0) - return REG_VALID; - /* Read (when needed) ... */ - if (in != NULL - || offset > 0 - || offset + len < descr->sizeof_register[regnum]) - { - enum register_status status; - - gdb_assert (read != NULL); - status = read (regcache, regnum, reg); - if (status != REG_VALID) - return status; - } - /* ... modify ... */ - if (in != NULL) - memcpy (in, reg + offset, len); - if (out != NULL) - memcpy (reg + offset, out, len); - /* ... write (when needed). */ - if (out != NULL) - { - gdb_assert (write != NULL); - write (regcache, regnum, reg); - } - - return REG_VALID; -} - -enum register_status -regcache_raw_read_part (struct regcache *regcache, int regnum, - int offset, int len, gdb_byte *buf) -{ - struct regcache_descr *descr = regcache->descr; - - gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers); - return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL, - regcache_raw_read, regcache_raw_write); -} - -void -regcache_raw_write_part (struct regcache *regcache, int regnum, - int offset, int len, const gdb_byte *buf) -{ - struct regcache_descr *descr = regcache->descr; - - gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers); - regcache_xfer_part (regcache, regnum, offset, len, NULL, buf, - regcache_raw_read, regcache_raw_write); -} - -enum register_status -regcache_cooked_read_part (struct regcache *regcache, int regnum, - int offset, int len, gdb_byte *buf) -{ - struct regcache_descr *descr = regcache->descr; - - gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); - return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL, - regcache_cooked_read, regcache_cooked_write); -} - -void -regcache_cooked_write_part (struct regcache *regcache, int regnum, - int offset, int len, const gdb_byte *buf) -{ - struct regcache_descr *descr = regcache->descr; - - gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); - regcache_xfer_part (regcache, regnum, offset, len, NULL, buf, - regcache_cooked_read, regcache_cooked_write); -} - -/* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */ - -void -regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf) -{ - void *regbuf; - size_t size; - - gdb_assert (regcache != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - gdb_assert (!regcache->readonly_p); - - regbuf = register_buffer (regcache, regnum); - size = regcache->descr->sizeof_register[regnum]; - - if (buf) - { - memcpy (regbuf, buf, size); - regcache->register_status[regnum] = REG_VALID; - } - else - { - /* This memset not strictly necessary, but better than garbage - in case the register value manages to escape somewhere (due - to a bug, no less). */ - memset (regbuf, 0, size); - regcache->register_status[regnum] = REG_UNAVAILABLE; - } -} - -/* Collect register REGNUM from REGCACHE and store its contents in BUF. */ - -void -regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf) -{ - const void *regbuf; - size_t size; - - gdb_assert (regcache != NULL && buf != NULL); - gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); - - regbuf = register_buffer (regcache, regnum); - size = regcache->descr->sizeof_register[regnum]; - memcpy (buf, regbuf, size); -} - - -/* Special handling for register PC. */ - -CORE_ADDR -regcache_read_pc (struct regcache *regcache) -{ - struct gdbarch *gdbarch = get_regcache_arch (regcache); - - CORE_ADDR pc_val; - - if (gdbarch_read_pc_p (gdbarch)) - pc_val = gdbarch_read_pc (gdbarch, regcache); - /* Else use per-frame method on get_current_frame. */ - else if (gdbarch_pc_regnum (gdbarch) >= 0) - { - ULONGEST raw_val; - - if (regcache_cooked_read_unsigned (regcache, - gdbarch_pc_regnum (gdbarch), - &raw_val) == REG_UNAVAILABLE) - throw_error (NOT_AVAILABLE_ERROR, _("PC register is not available")); - - pc_val = gdbarch_addr_bits_remove (gdbarch, raw_val); - } - else - internal_error (__FILE__, __LINE__, - _("regcache_read_pc: Unable to find PC")); - return pc_val; -} - -void -regcache_write_pc (struct regcache *regcache, CORE_ADDR pc) -{ - struct gdbarch *gdbarch = get_regcache_arch (regcache); - - if (gdbarch_write_pc_p (gdbarch)) - gdbarch_write_pc (gdbarch, regcache, pc); - else if (gdbarch_pc_regnum (gdbarch) >= 0) - regcache_cooked_write_unsigned (regcache, - gdbarch_pc_regnum (gdbarch), pc); - else - internal_error (__FILE__, __LINE__, - _("regcache_write_pc: Unable to update PC")); - - /* Writing the PC (for instance, from "load") invalidates the - current frame. */ - reinit_frame_cache (); -} - - -static void -reg_flush_command (char *command, int from_tty) -{ - /* Force-flush the register cache. */ - registers_changed (); - if (from_tty) - printf_filtered (_("Register cache flushed.\n")); -} - -static void -dump_endian_bytes (struct ui_file *file, enum bfd_endian endian, - const unsigned char *buf, long len) -{ - int i; - - switch (endian) - { - case BFD_ENDIAN_BIG: - for (i = 0; i < len; i++) - fprintf_unfiltered (file, "%02x", buf[i]); - break; - case BFD_ENDIAN_LITTLE: - for (i = len - 1; i >= 0; i--) - fprintf_unfiltered (file, "%02x", buf[i]); - break; - default: - internal_error (__FILE__, __LINE__, _("Bad switch")); - } -} - -enum regcache_dump_what -{ - regcache_dump_none, regcache_dump_raw, - regcache_dump_cooked, regcache_dump_groups, - regcache_dump_remote -}; - -static void -regcache_dump (struct regcache *regcache, struct ui_file *file, - enum regcache_dump_what what_to_dump) -{ - struct cleanup *cleanups = make_cleanup (null_cleanup, NULL); - struct gdbarch *gdbarch = regcache->descr->gdbarch; - int regnum; - int footnote_nr = 0; - int footnote_register_size = 0; - int footnote_register_offset = 0; - int footnote_register_type_name_null = 0; - long register_offset = 0; - unsigned char buf[MAX_REGISTER_SIZE]; - -#if 0 - fprintf_unfiltered (file, "nr_raw_registers %d\n", - regcache->descr->nr_raw_registers); - fprintf_unfiltered (file, "nr_cooked_registers %d\n", - regcache->descr->nr_cooked_registers); - fprintf_unfiltered (file, "sizeof_raw_registers %ld\n", - regcache->descr->sizeof_raw_registers); - fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n", - regcache->descr->sizeof_raw_register_status); - fprintf_unfiltered (file, "gdbarch_num_regs %d\n", - gdbarch_num_regs (gdbarch)); - fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n", - gdbarch_num_pseudo_regs (gdbarch)); -#endif - - gdb_assert (regcache->descr->nr_cooked_registers - == (gdbarch_num_regs (gdbarch) - + gdbarch_num_pseudo_regs (gdbarch))); - - for (regnum = -1; regnum < regcache->descr->nr_cooked_registers; regnum++) - { - /* Name. */ - if (regnum < 0) - fprintf_unfiltered (file, " %-10s", "Name"); - else - { - const char *p = gdbarch_register_name (gdbarch, regnum); - - if (p == NULL) - p = ""; - else if (p[0] == '\0') - p = "''"; - fprintf_unfiltered (file, " %-10s", p); - } - - /* Number. */ - if (regnum < 0) - fprintf_unfiltered (file, " %4s", "Nr"); - else - fprintf_unfiltered (file, " %4d", regnum); - - /* Relative number. */ - if (regnum < 0) - fprintf_unfiltered (file, " %4s", "Rel"); - else if (regnum < gdbarch_num_regs (gdbarch)) - fprintf_unfiltered (file, " %4d", regnum); - else - fprintf_unfiltered (file, " %4d", - (regnum - gdbarch_num_regs (gdbarch))); - - /* Offset. */ - if (regnum < 0) - fprintf_unfiltered (file, " %6s ", "Offset"); - else - { - fprintf_unfiltered (file, " %6ld", - regcache->descr->register_offset[regnum]); - if (register_offset != regcache->descr->register_offset[regnum] - || (regnum > 0 - && (regcache->descr->register_offset[regnum] - != (regcache->descr->register_offset[regnum - 1] - + regcache->descr->sizeof_register[regnum - 1]))) - ) - { - if (!footnote_register_offset) - footnote_register_offset = ++footnote_nr; - fprintf_unfiltered (file, "*%d", footnote_register_offset); - } - else - fprintf_unfiltered (file, " "); - register_offset = (regcache->descr->register_offset[regnum] - + regcache->descr->sizeof_register[regnum]); - } - - /* Size. */ - if (regnum < 0) - fprintf_unfiltered (file, " %5s ", "Size"); - else - fprintf_unfiltered (file, " %5ld", - regcache->descr->sizeof_register[regnum]); - - /* Type. */ - { - const char *t; - - if (regnum < 0) - t = "Type"; - else - { - static const char blt[] = "builtin_type"; - - t = TYPE_NAME (register_type (regcache->descr->gdbarch, regnum)); - if (t == NULL) - { - char *n; - - if (!footnote_register_type_name_null) - footnote_register_type_name_null = ++footnote_nr; - n = xstrprintf ("*%d", footnote_register_type_name_null); - make_cleanup (xfree, n); - t = n; - } - /* Chop a leading builtin_type. */ - if (strncmp (t, blt, strlen (blt)) == 0) - t += strlen (blt); - } - fprintf_unfiltered (file, " %-15s", t); - } - - /* Leading space always present. */ - fprintf_unfiltered (file, " "); - - /* Value, raw. */ - if (what_to_dump == regcache_dump_raw) - { - if (regnum < 0) - fprintf_unfiltered (file, "Raw value"); - else if (regnum >= regcache->descr->nr_raw_registers) - fprintf_unfiltered (file, "<cooked>"); - else if (regcache_register_status (regcache, regnum) == REG_UNKNOWN) - fprintf_unfiltered (file, "<invalid>"); - else if (regcache_register_status (regcache, regnum) == REG_UNAVAILABLE) - fprintf_unfiltered (file, "<unavailable>"); - else - { - regcache_raw_read (regcache, regnum, buf); - fprintf_unfiltered (file, "0x"); - dump_endian_bytes (file, - gdbarch_byte_order (gdbarch), buf, - regcache->descr->sizeof_register[regnum]); - } - } - - /* Value, cooked. */ - if (what_to_dump == regcache_dump_cooked) - { - if (regnum < 0) - fprintf_unfiltered (file, "Cooked value"); - else - { - enum register_status status; - - status = regcache_cooked_read (regcache, regnum, buf); - if (status == REG_UNKNOWN) - fprintf_unfiltered (file, "<invalid>"); - else if (status == REG_UNAVAILABLE) - fprintf_unfiltered (file, "<unavailable>"); - else - { - fprintf_unfiltered (file, "0x"); - dump_endian_bytes (file, - gdbarch_byte_order (gdbarch), buf, - regcache->descr->sizeof_register[regnum]); - } - } - } - - /* Group members. */ - if (what_to_dump == regcache_dump_groups) - { - if (regnum < 0) - fprintf_unfiltered (file, "Groups"); - else - { - const char *sep = ""; - struct reggroup *group; - - for (group = reggroup_next (gdbarch, NULL); - group != NULL; - group = reggroup_next (gdbarch, group)) - { - if (gdbarch_register_reggroup_p (gdbarch, regnum, group)) - { - fprintf_unfiltered (file, - "%s%s", sep, reggroup_name (group)); - sep = ","; - } - } - } - } - - /* Remote packet configuration. */ - if (what_to_dump == regcache_dump_remote) - { - if (regnum < 0) - { - fprintf_unfiltered (file, "Rmt Nr g/G Offset"); - } - else if (regnum < regcache->descr->nr_raw_registers) - { - int pnum, poffset; - - if (remote_register_number_and_offset (get_regcache_arch (regcache), regnum, - &pnum, &poffset)) - fprintf_unfiltered (file, "%7d %11d", pnum, poffset); - } - } - - fprintf_unfiltered (file, "\n"); - } - - if (footnote_register_size) - fprintf_unfiltered (file, "*%d: Inconsistent register sizes.\n", - footnote_register_size); - if (footnote_register_offset) - fprintf_unfiltered (file, "*%d: Inconsistent register offsets.\n", - footnote_register_offset); - if (footnote_register_type_name_null) - fprintf_unfiltered (file, - "*%d: Register type's name NULL.\n", - footnote_register_type_name_null); - do_cleanups (cleanups); -} - -static void -regcache_print (char *args, enum regcache_dump_what what_to_dump) -{ - if (args == NULL) - regcache_dump (get_current_regcache (), gdb_stdout, what_to_dump); - else - { - struct cleanup *cleanups; - struct ui_file *file = gdb_fopen (args, "w"); - - if (file == NULL) - perror_with_name (_("maintenance print architecture")); - cleanups = make_cleanup_ui_file_delete (file); - regcache_dump (get_current_regcache (), file, what_to_dump); - do_cleanups (cleanups); - } -} - -static void -maintenance_print_registers (char *args, int from_tty) -{ - regcache_print (args, regcache_dump_none); -} - -static void -maintenance_print_raw_registers (char *args, int from_tty) -{ - regcache_print (args, regcache_dump_raw); -} - -static void -maintenance_print_cooked_registers (char *args, int from_tty) -{ - regcache_print (args, regcache_dump_cooked); -} - -static void -maintenance_print_register_groups (char *args, int from_tty) -{ - regcache_print (args, regcache_dump_groups); -} - -static void -maintenance_print_remote_registers (char *args, int from_tty) -{ - regcache_print (args, regcache_dump_remote); -} - -extern initialize_file_ftype _initialize_regcache; /* -Wmissing-prototype */ - -void -_initialize_regcache (void) -{ - regcache_descr_handle - = gdbarch_data_register_post_init (init_regcache_descr); - - observer_attach_target_changed (regcache_observer_target_changed); - observer_attach_thread_ptid_changed (regcache_thread_ptid_changed); - - add_com ("flushregs", class_maintenance, reg_flush_command, - _("Force gdb to flush its register cache (maintainer command)")); - - add_cmd ("registers", class_maintenance, maintenance_print_registers, - _("Print the internal register configuration.\n" - "Takes an optional file parameter."), &maintenanceprintlist); - add_cmd ("raw-registers", class_maintenance, - maintenance_print_raw_registers, - _("Print the internal register configuration " - "including raw values.\n" - "Takes an optional file parameter."), &maintenanceprintlist); - add_cmd ("cooked-registers", class_maintenance, - maintenance_print_cooked_registers, - _("Print the internal register configuration " - "including cooked values.\n" - "Takes an optional file parameter."), &maintenanceprintlist); - add_cmd ("register-groups", class_maintenance, - maintenance_print_register_groups, - _("Print the internal register configuration " - "including each register's group.\n" - "Takes an optional file parameter."), - &maintenanceprintlist); - add_cmd ("remote-registers", class_maintenance, - maintenance_print_remote_registers, _("\ -Print the internal register configuration including each register's\n\ -remote register number and buffer offset in the g/G packets.\n\ -Takes an optional file parameter."), - &maintenanceprintlist); - -} |