| /* Cache and manage the values of registers for GDB, the GNU debugger. |
| |
| Copyright (C) 1986-2018 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 "observer.h" |
| #include "regset.h" |
| #include <forward_list> |
| |
| /* |
| * 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. */ |
| long sizeof_raw_registers; |
| |
| /* 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; |
| |
| /* 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); |
| |
| /* 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. */ |
| |
| /* 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 < gdbarch_num_regs (gdbarch); i++) |
| { |
| descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]); |
| descr->register_offset[i] = offset; |
| offset += 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]; |
| } |
| /* 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 (struct regcache_descr *) 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; |
| } |
| |
| /* See common/common-regcache.h. */ |
| |
| int |
| regcache_register_size (const struct regcache *regcache, int n) |
| { |
| return register_size (regcache->arch (), n); |
| } |
| |
| reg_buffer::reg_buffer (gdbarch *gdbarch, bool has_pseudo) |
| : m_has_pseudo (has_pseudo) |
| { |
| gdb_assert (gdbarch != NULL); |
| m_descr = regcache_descr (gdbarch); |
| |
| if (has_pseudo) |
| { |
| m_registers = XCNEWVEC (gdb_byte, m_descr->sizeof_cooked_registers); |
| m_register_status = XCNEWVEC (signed char, |
| m_descr->nr_cooked_registers); |
| } |
| else |
| { |
| m_registers = XCNEWVEC (gdb_byte, m_descr->sizeof_raw_registers); |
| m_register_status = XCNEWVEC (signed char, gdbarch_num_regs (gdbarch)); |
| } |
| } |
| |
| regcache::regcache (gdbarch *gdbarch, const address_space *aspace_) |
| /* The register buffers. A read/write register cache can only hold |
| [0 .. gdbarch_num_regs). */ |
| : detached_regcache (gdbarch, false), m_aspace (aspace_) |
| { |
| m_ptid = minus_one_ptid; |
| } |
| |
| static enum register_status |
| do_cooked_read (void *src, int regnum, gdb_byte *buf) |
| { |
| struct regcache *regcache = (struct regcache *) src; |
| |
| return regcache_cooked_read (regcache, regnum, buf); |
| } |
| |
| readonly_detached_regcache::readonly_detached_regcache (const regcache &src) |
| : readonly_detached_regcache (src.arch (), do_cooked_read, (void *) &src) |
| { |
| } |
| |
| gdbarch * |
| reg_buffer::arch () const |
| { |
| return m_descr->gdbarch; |
| } |
| |
| /* See regcache.h. */ |
| |
| ptid_t |
| regcache_get_ptid (const struct regcache *regcache) |
| { |
| gdb_assert (!ptid_equal (regcache->ptid (), minus_one_ptid)); |
| |
| return regcache->ptid (); |
| } |
| |
| /* Cleanup class for invalidating a register. */ |
| |
| class regcache_invalidator |
| { |
| public: |
| |
| regcache_invalidator (struct regcache *regcache, int regnum) |
| : m_regcache (regcache), |
| m_regnum (regnum) |
| { |
| } |
| |
| ~regcache_invalidator () |
| { |
| if (m_regcache != nullptr) |
| regcache_invalidate (m_regcache, m_regnum); |
| } |
| |
| DISABLE_COPY_AND_ASSIGN (regcache_invalidator); |
| |
| void release () |
| { |
| m_regcache = nullptr; |
| } |
| |
| private: |
| |
| struct regcache *m_regcache; |
| int m_regnum; |
| }; |
| |
| /* Return a pointer to register REGNUM's buffer cache. */ |
| |
| gdb_byte * |
| reg_buffer::register_buffer (int regnum) const |
| { |
| return m_registers + m_descr->register_offset[regnum]; |
| } |
| |
| void |
| reg_buffer::save (regcache_cooked_read_ftype *cooked_read, |
| void *src) |
| { |
| struct gdbarch *gdbarch = m_descr->gdbarch; |
| int regnum; |
| |
| /* It should have pseudo registers. */ |
| gdb_assert (m_has_pseudo); |
| /* Clear the dest. */ |
| memset (m_registers, 0, m_descr->sizeof_cooked_registers); |
| memset (m_register_status, 0, m_descr->nr_cooked_registers); |
| /* 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 < m_descr->nr_cooked_registers; regnum++) |
| { |
| if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup)) |
| { |
| gdb_byte *dst_buf = register_buffer (regnum); |
| enum register_status status = cooked_read (src, regnum, dst_buf); |
| |
| gdb_assert (status != REG_UNKNOWN); |
| |
| if (status != REG_VALID) |
| memset (dst_buf, 0, register_size (gdbarch, regnum)); |
| |
| m_register_status[regnum] = status; |
| } |
| } |
| } |
| |
| void |
| regcache::restore (readonly_detached_regcache *src) |
| { |
| struct gdbarch *gdbarch = m_descr->gdbarch; |
| int regnum; |
| |
| gdb_assert (src != NULL); |
| gdb_assert (src->m_has_pseudo); |
| |
| gdb_assert (gdbarch == src->arch ()); |
| |
| /* 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 < m_descr->nr_cooked_registers; regnum++) |
| { |
| if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup)) |
| { |
| if (src->m_register_status[regnum] == REG_VALID) |
| cooked_write (regnum, src->register_buffer (regnum)); |
| } |
| } |
| } |
| |
| enum register_status |
| regcache_register_status (const struct regcache *regcache, int regnum) |
| { |
| gdb_assert (regcache != NULL); |
| return regcache->get_register_status (regnum); |
| } |
| |
| enum register_status |
| reg_buffer::get_register_status (int regnum) const |
| { |
| assert_regnum (regnum); |
| |
| return (enum register_status) m_register_status[regnum]; |
| } |
| |
| void |
| regcache_invalidate (struct regcache *regcache, int regnum) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->invalidate (regnum); |
| } |
| |
| void |
| detached_regcache::invalidate (int regnum) |
| { |
| assert_regnum (regnum); |
| m_register_status[regnum] = REG_UNKNOWN; |
| } |
| |
| void |
| reg_buffer::assert_regnum (int regnum) const |
| { |
| gdb_assert (regnum >= 0); |
| if (m_has_pseudo) |
| gdb_assert (regnum < m_descr->nr_cooked_registers); |
| else |
| gdb_assert (regnum < gdbarch_num_regs (arch ())); |
| } |
| |
| /* 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. */ |
| std::forward_list<regcache *> regcache::current_regcache; |
| |
| struct regcache * |
| get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch, |
| struct address_space *aspace) |
| { |
| for (const auto ®cache : regcache::current_regcache) |
| if (ptid_equal (regcache->ptid (), ptid) && regcache->arch () == gdbarch) |
| return regcache; |
| |
| regcache *new_regcache = new regcache (gdbarch, aspace); |
| |
| regcache::current_regcache.push_front (new_regcache); |
| new_regcache->set_ptid (ptid); |
| |
| return new_regcache; |
| } |
| |
| struct regcache * |
| get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch) |
| { |
| address_space *aspace = 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); |
| } |
| |
| /* See common/common-regcache.h. */ |
| |
| struct regcache * |
| get_thread_regcache_for_ptid (ptid_t ptid) |
| { |
| return get_thread_regcache (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. */ |
| void |
| regcache::regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) |
| { |
| for (auto ®cache : regcache::current_regcache) |
| { |
| if (ptid_equal (regcache->ptid (), old_ptid)) |
| regcache->set_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) |
| { |
| for (auto oit = regcache::current_regcache.before_begin (), |
| it = std::next (oit); |
| it != regcache::current_regcache.end (); |
| ) |
| { |
| if (ptid_match ((*it)->ptid (), ptid)) |
| { |
| delete *it; |
| it = regcache::current_regcache.erase_after (oit); |
| } |
| else |
| oit = it++; |
| } |
| |
| if (ptid_match (current_thread_ptid, ptid)) |
| { |
| current_thread_ptid = null_ptid; |
| current_thread_arch = NULL; |
| } |
| |
| if (ptid_match (inferior_ptid, 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); |
| } |
| |
| void |
| regcache_raw_update (struct regcache *regcache, int regnum) |
| { |
| gdb_assert (regcache != NULL); |
| |
| regcache->raw_update (regnum); |
| } |
| |
| void |
| regcache::raw_update (int regnum) |
| { |
| assert_regnum (regnum); |
| |
| /* 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 (get_register_status (regnum) == REG_UNKNOWN) |
| { |
| target_fetch_registers (this, regnum); |
| |
| /* 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 (m_register_status[regnum] == REG_UNKNOWN) |
| m_register_status[regnum] = REG_UNAVAILABLE; |
| } |
| } |
| |
| enum register_status |
| regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf) |
| { |
| return regcache->raw_read (regnum, buf); |
| } |
| |
| enum register_status |
| readable_regcache::raw_read (int regnum, gdb_byte *buf) |
| { |
| gdb_assert (buf != NULL); |
| raw_update (regnum); |
| |
| if (m_register_status[regnum] != REG_VALID) |
| memset (buf, 0, m_descr->sizeof_register[regnum]); |
| else |
| memcpy (buf, register_buffer (regnum), |
| m_descr->sizeof_register[regnum]); |
| |
| return (enum register_status) m_register_status[regnum]; |
| } |
| |
| enum register_status |
| regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val) |
| { |
| gdb_assert (regcache != NULL); |
| return regcache->raw_read (regnum, val); |
| } |
| |
| template<typename T, typename> |
| enum register_status |
| readable_regcache::raw_read (int regnum, T *val) |
| { |
| gdb_byte *buf; |
| enum register_status status; |
| |
| assert_regnum (regnum); |
| buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]); |
| status = raw_read (regnum, buf); |
| if (status == REG_VALID) |
| *val = extract_integer<T> (buf, |
| m_descr->sizeof_register[regnum], |
| gdbarch_byte_order (m_descr->gdbarch)); |
| else |
| *val = 0; |
| return status; |
| } |
| |
| enum register_status |
| regcache_raw_read_unsigned (struct regcache *regcache, int regnum, |
| ULONGEST *val) |
| { |
| gdb_assert (regcache != NULL); |
| return regcache->raw_read (regnum, val); |
| } |
| |
| void |
| regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->raw_write (regnum, val); |
| } |
| |
| template<typename T, typename> |
| void |
| regcache::raw_write (int regnum, T val) |
| { |
| gdb_byte *buf; |
| |
| assert_regnum (regnum); |
| buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]); |
| store_integer (buf, m_descr->sizeof_register[regnum], |
| gdbarch_byte_order (m_descr->gdbarch), val); |
| raw_write (regnum, buf); |
| } |
| |
| void |
| regcache_raw_write_unsigned (struct regcache *regcache, int regnum, |
| ULONGEST val) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->raw_write (regnum, val); |
| } |
| |
| LONGEST |
| regcache_raw_get_signed (struct regcache *regcache, int regnum) |
| { |
| LONGEST value; |
| enum register_status status; |
| |
| status = regcache_raw_read_signed (regcache, regnum, &value); |
| if (status == REG_UNAVAILABLE) |
| throw_error (NOT_AVAILABLE_ERROR, |
| _("Register %d is not available"), regnum); |
| return value; |
| } |
| |
| enum register_status |
| regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf) |
| { |
| return regcache->cooked_read (regnum, buf); |
| } |
| |
| enum register_status |
| readable_regcache::cooked_read (int regnum, gdb_byte *buf) |
| { |
| gdb_assert (regnum >= 0); |
| gdb_assert (regnum < m_descr->nr_cooked_registers); |
| if (regnum < num_raw_registers ()) |
| return raw_read (regnum, buf); |
| else if (m_has_pseudo |
| && m_register_status[regnum] != REG_UNKNOWN) |
| { |
| if (m_register_status[regnum] == REG_VALID) |
| memcpy (buf, register_buffer (regnum), |
| m_descr->sizeof_register[regnum]); |
| else |
| memset (buf, 0, m_descr->sizeof_register[regnum]); |
| |
| return (enum register_status) m_register_status[regnum]; |
| } |
| else if (gdbarch_pseudo_register_read_value_p (m_descr->gdbarch)) |
| { |
| struct value *mark, *computed; |
| enum register_status result = REG_VALID; |
| |
| mark = value_mark (); |
| |
| computed = gdbarch_pseudo_register_read_value (m_descr->gdbarch, |
| this, regnum); |
| if (value_entirely_available (computed)) |
| memcpy (buf, value_contents_raw (computed), |
| m_descr->sizeof_register[regnum]); |
| else |
| { |
| memset (buf, 0, m_descr->sizeof_register[regnum]); |
| result = REG_UNAVAILABLE; |
| } |
| |
| value_free_to_mark (mark); |
| |
| return result; |
| } |
| else |
| return gdbarch_pseudo_register_read (m_descr->gdbarch, this, |
| regnum, buf); |
| } |
| |
| struct value * |
| regcache_cooked_read_value (struct regcache *regcache, int regnum) |
| { |
| return regcache->cooked_read_value (regnum); |
| } |
| |
| struct value * |
| readable_regcache::cooked_read_value (int regnum) |
| { |
| gdb_assert (regnum >= 0); |
| gdb_assert (regnum < m_descr->nr_cooked_registers); |
| |
| if (regnum < num_raw_registers () |
| || (m_has_pseudo && m_register_status[regnum] != REG_UNKNOWN) |
| || !gdbarch_pseudo_register_read_value_p (m_descr->gdbarch)) |
| { |
| struct value *result; |
| |
| result = allocate_value (register_type (m_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 (cooked_read (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 (m_descr->gdbarch, |
| this, regnum); |
| } |
| |
| enum register_status |
| regcache_cooked_read_signed (struct regcache *regcache, int regnum, |
| LONGEST *val) |
| { |
| gdb_assert (regcache != NULL); |
| return regcache->cooked_read (regnum, val); |
| } |
| |
| template<typename T, typename> |
| enum register_status |
| readable_regcache::cooked_read (int regnum, T *val) |
| { |
| enum register_status status; |
| gdb_byte *buf; |
| |
| gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers); |
| buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]); |
| status = cooked_read (regnum, buf); |
| if (status == REG_VALID) |
| *val = extract_integer<T> (buf, m_descr->sizeof_register[regnum], |
| gdbarch_byte_order (m_descr->gdbarch)); |
| else |
| *val = 0; |
| return status; |
| } |
| |
| enum register_status |
| regcache_cooked_read_unsigned (struct regcache *regcache, int regnum, |
| ULONGEST *val) |
| { |
| gdb_assert (regcache != NULL); |
| return regcache->cooked_read (regnum, val); |
| } |
| |
| void |
| regcache_cooked_write_signed (struct regcache *regcache, int regnum, |
| LONGEST val) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->cooked_write (regnum, val); |
| } |
| |
| template<typename T, typename> |
| void |
| regcache::cooked_write (int regnum, T val) |
| { |
| gdb_byte *buf; |
| |
| gdb_assert (regnum >=0 && regnum < m_descr->nr_cooked_registers); |
| buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]); |
| store_integer (buf, m_descr->sizeof_register[regnum], |
| gdbarch_byte_order (m_descr->gdbarch), val); |
| cooked_write (regnum, buf); |
| } |
| |
| void |
| regcache_cooked_write_unsigned (struct regcache *regcache, int regnum, |
| ULONGEST val) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->cooked_write (regnum, val); |
| } |
| |
| void |
| regcache_raw_write (struct regcache *regcache, int regnum, |
| const gdb_byte *buf) |
| { |
| gdb_assert (regcache != NULL && buf != NULL); |
| regcache->raw_write (regnum, buf); |
| } |
| |
| void |
| regcache::raw_write (int regnum, const gdb_byte *buf) |
| { |
| |
| gdb_assert (buf != NULL); |
| assert_regnum (regnum); |
| |
| /* 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 (arch (), 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 (get_register_status (regnum) == REG_VALID |
| && (memcmp (register_buffer (regnum), buf, |
| m_descr->sizeof_register[regnum]) == 0)) |
| return; |
| |
| target_prepare_to_store (this); |
| raw_supply (regnum, buf); |
| |
| /* Invalidate the register after it is written, in case of a |
| failure. */ |
| regcache_invalidator invalidator (this, regnum); |
| |
| target_store_registers (this, regnum); |
| |
| /* The target did not throw an error so we can discard invalidating |
| the register. */ |
| invalidator.release (); |
| } |
| |
| void |
| regcache_cooked_write (struct regcache *regcache, int regnum, |
| const gdb_byte *buf) |
| { |
| regcache->cooked_write (regnum, buf); |
| } |
| |
| void |
| regcache::cooked_write (int regnum, const gdb_byte *buf) |
| { |
| gdb_assert (regnum >= 0); |
| gdb_assert (regnum < m_descr->nr_cooked_registers); |
| if (regnum < num_raw_registers ()) |
| raw_write (regnum, buf); |
| else |
| gdbarch_pseudo_register_write (m_descr->gdbarch, this, |
| 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); |
| |
| enum register_status |
| readable_regcache::read_part (int regnum, int offset, int len, void *in, |
| bool is_raw) |
| { |
| struct gdbarch *gdbarch = arch (); |
| gdb_byte *reg = (gdb_byte *) alloca (register_size (gdbarch, regnum)); |
| |
| gdb_assert (in != NULL); |
| gdb_assert (offset >= 0 && offset <= m_descr->sizeof_register[regnum]); |
| gdb_assert (len >= 0 && offset + len <= m_descr->sizeof_register[regnum]); |
| /* Something to do? */ |
| if (offset + len == 0) |
| return REG_VALID; |
| /* Read (when needed) ... */ |
| enum register_status status; |
| |
| if (is_raw) |
| status = raw_read (regnum, reg); |
| else |
| status = cooked_read (regnum, reg); |
| if (status != REG_VALID) |
| return status; |
| |
| /* ... modify ... */ |
| memcpy (in, reg + offset, len); |
| |
| return REG_VALID; |
| } |
| |
| enum register_status |
| regcache::write_part (int regnum, int offset, int len, |
| const void *out, bool is_raw) |
| { |
| struct gdbarch *gdbarch = arch (); |
| gdb_byte *reg = (gdb_byte *) alloca (register_size (gdbarch, regnum)); |
| |
| gdb_assert (out != NULL); |
| gdb_assert (offset >= 0 && offset <= m_descr->sizeof_register[regnum]); |
| gdb_assert (len >= 0 && offset + len <= m_descr->sizeof_register[regnum]); |
| /* Something to do? */ |
| if (offset + len == 0) |
| return REG_VALID; |
| /* Read (when needed) ... */ |
| if (offset > 0 |
| || offset + len < m_descr->sizeof_register[regnum]) |
| { |
| enum register_status status; |
| |
| if (is_raw) |
| status = raw_read (regnum, reg); |
| else |
| status = cooked_read (regnum, reg); |
| if (status != REG_VALID) |
| return status; |
| } |
| |
| memcpy (reg + offset, out, len); |
| /* ... write (when needed). */ |
| if (is_raw) |
| raw_write (regnum, reg); |
| else |
| cooked_write (regnum, reg); |
| |
| return REG_VALID; |
| } |
| |
| enum register_status |
| regcache_raw_read_part (struct regcache *regcache, int regnum, |
| int offset, int len, gdb_byte *buf) |
| { |
| return regcache->raw_read_part (regnum, offset, len, buf); |
| } |
| |
| enum register_status |
| readable_regcache::raw_read_part (int regnum, int offset, int len, gdb_byte *buf) |
| { |
| assert_regnum (regnum); |
| return read_part (regnum, offset, len, buf, true); |
| } |
| |
| void |
| regcache_raw_write_part (struct regcache *regcache, int regnum, |
| int offset, int len, const gdb_byte *buf) |
| { |
| regcache->raw_write_part (regnum, offset, len, buf); |
| } |
| |
| void |
| regcache::raw_write_part (int regnum, int offset, int len, |
| const gdb_byte *buf) |
| { |
| assert_regnum (regnum); |
| write_part (regnum, offset, len, buf, true); |
| } |
| |
| enum register_status |
| regcache_cooked_read_part (struct regcache *regcache, int regnum, |
| int offset, int len, gdb_byte *buf) |
| { |
| return regcache->cooked_read_part (regnum, offset, len, buf); |
| } |
| |
| |
| enum register_status |
| readable_regcache::cooked_read_part (int regnum, int offset, int len, |
| gdb_byte *buf) |
| { |
| gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers); |
| return read_part (regnum, offset, len, buf, false); |
| } |
| |
| void |
| regcache_cooked_write_part (struct regcache *regcache, int regnum, |
| int offset, int len, const gdb_byte *buf) |
| { |
| regcache->cooked_write_part (regnum, offset, len, buf); |
| } |
| |
| void |
| regcache::cooked_write_part (int regnum, int offset, int len, |
| const gdb_byte *buf) |
| { |
| gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers); |
| write_part (regnum, offset, len, buf, false); |
| } |
| |
| /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */ |
| |
| void |
| regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf) |
| { |
| gdb_assert (regcache != NULL); |
| regcache->raw_supply (regnum, buf); |
| } |
| |
| void |
| detached_regcache::raw_supply (int regnum, const void *buf) |
| { |
| void *regbuf; |
| size_t size; |
| |
| assert_regnum (regnum); |
| |
| regbuf = register_buffer (regnum); |
| size = m_descr->sizeof_register[regnum]; |
| |
| if (buf) |
| { |
| memcpy (regbuf, buf, size); |
| m_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); |
| m_register_status[regnum] = REG_UNAVAILABLE; |
| } |
| } |
| |
| /* Supply register REGNUM to REGCACHE. Value to supply is an integer stored at |
| address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED. If |
| the register size is greater than ADDR_LEN, then the integer will be sign or |
| zero extended. If the register size is smaller than the integer, then the |
| most significant bytes of the integer will be truncated. */ |
| |
| void |
| detached_regcache::raw_supply_integer (int regnum, const gdb_byte *addr, |
| int addr_len, bool is_signed) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (m_descr->gdbarch); |
| gdb_byte *regbuf; |
| size_t regsize; |
| |
| assert_regnum (regnum); |
| |
| regbuf = register_buffer (regnum); |
| regsize = m_descr->sizeof_register[regnum]; |
| |
| copy_integer_to_size (regbuf, regsize, addr, addr_len, is_signed, |
| byte_order); |
| m_register_status[regnum] = REG_VALID; |
| } |
| |
| /* Supply register REGNUM with zeroed value to REGCACHE. This is not the same |
| as calling raw_supply with NULL (which will set the state to |
| unavailable). */ |
| |
| void |
| detached_regcache::raw_supply_zeroed (int regnum) |
| { |
| void *regbuf; |
| size_t size; |
| |
| assert_regnum (regnum); |
| |
| regbuf = register_buffer (regnum); |
| size = m_descr->sizeof_register[regnum]; |
| |
| memset (regbuf, 0, size); |
| m_register_status[regnum] = REG_VALID; |
| } |
| |
| /* Collect register REGNUM from REGCACHE and store its contents in BUF. */ |
| |
| void |
| regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf) |
| { |
| gdb_assert (regcache != NULL && buf != NULL); |
| regcache->raw_collect (regnum, buf); |
| } |
| |
| void |
| regcache::raw_collect (int regnum, void *buf) const |
| { |
| const void *regbuf; |
| size_t size; |
| |
| gdb_assert (buf != NULL); |
| assert_regnum (regnum); |
| |
| regbuf = register_buffer (regnum); |
| size = m_descr->sizeof_register[regnum]; |
| memcpy (buf, regbuf, size); |
| } |
| |
| /* Transfer a single or all registers belonging to a certain register |
| set to or from a buffer. This is the main worker function for |
| regcache_supply_regset and regcache_collect_regset. */ |
| |
| /* Collect register REGNUM from REGCACHE. Store collected value as an integer |
| at address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED. |
| If ADDR_LEN is greater than the register size, then the integer will be sign |
| or zero extended. If ADDR_LEN is smaller than the register size, then the |
| most significant bytes of the integer will be truncated. */ |
| |
| void |
| regcache::raw_collect_integer (int regnum, gdb_byte *addr, int addr_len, |
| bool is_signed) const |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (m_descr->gdbarch); |
| const gdb_byte *regbuf; |
| size_t regsize; |
| |
| assert_regnum (regnum); |
| |
| regbuf = register_buffer (regnum); |
| regsize = m_descr->sizeof_register[regnum]; |
| |
| copy_integer_to_size (addr, addr_len, regbuf, regsize, is_signed, |
| byte_order); |
| } |
| |
| void |
| regcache::transfer_regset (const struct regset *regset, |
| struct regcache *out_regcache, |
| int regnum, const void *in_buf, |
| void *out_buf, size_t size) const |
| { |
| const struct regcache_map_entry *map; |
| int offs = 0, count; |
| |
| for (map = (const struct regcache_map_entry *) regset->regmap; |
| (count = map->count) != 0; |
| map++) |
| { |
| int regno = map->regno; |
| int slot_size = map->size; |
| |
| if (slot_size == 0 && regno != REGCACHE_MAP_SKIP) |
| slot_size = m_descr->sizeof_register[regno]; |
| |
| if (regno == REGCACHE_MAP_SKIP |
| || (regnum != -1 |
| && (regnum < regno || regnum >= regno + count))) |
| offs += count * slot_size; |
| |
| else if (regnum == -1) |
| for (; count--; regno++, offs += slot_size) |
| { |
| if (offs + slot_size > size) |
| break; |
| |
| if (out_buf) |
| raw_collect (regno, (gdb_byte *) out_buf + offs); |
| else |
| out_regcache->raw_supply (regno, in_buf |
| ? (const gdb_byte *) in_buf + offs |
| : NULL); |
| } |
| else |
| { |
| /* Transfer a single register and return. */ |
| offs += (regnum - regno) * slot_size; |
| if (offs + slot_size > size) |
| return; |
| |
| if (out_buf) |
| raw_collect (regnum, (gdb_byte *) out_buf + offs); |
| else |
| out_regcache->raw_supply (regnum, in_buf |
| ? (const gdb_byte *) in_buf + offs |
| : NULL); |
| return; |
| } |
| } |
| } |
| |
| /* Supply register REGNUM from BUF to REGCACHE, using the register map |
| in REGSET. If REGNUM is -1, do this for all registers in REGSET. |
| If BUF is NULL, set the register(s) to "unavailable" status. */ |
| |
| void |
| regcache_supply_regset (const struct regset *regset, |
| struct regcache *regcache, |
| int regnum, const void *buf, size_t size) |
| { |
| regcache->supply_regset (regset, regnum, buf, size); |
| } |
| |
| void |
| regcache::supply_regset (const struct regset *regset, |
| int regnum, const void *buf, size_t size) |
| { |
| transfer_regset (regset, this, regnum, buf, NULL, size); |
| } |
| |
| /* Collect register REGNUM from REGCACHE to BUF, using the register |
| map in REGSET. If REGNUM is -1, do this for all registers in |
| REGSET. */ |
| |
| void |
| regcache_collect_regset (const struct regset *regset, |
| const struct regcache *regcache, |
| int regnum, void *buf, size_t size) |
| { |
| regcache->collect_regset (regset, regnum, buf, size); |
| } |
| |
| void |
| regcache::collect_regset (const struct regset *regset, |
| int regnum, void *buf, size_t size) const |
| { |
| transfer_regset (regset, NULL, regnum, NULL, buf, size); |
| } |
| |
| |
| /* Special handling for register PC. */ |
| |
| CORE_ADDR |
| regcache_read_pc (struct regcache *regcache) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| |
| 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 = regcache->arch (); |
| |
| 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 (); |
| } |
| |
| int |
| reg_buffer::num_raw_registers () const |
| { |
| return gdbarch_num_regs (arch ()); |
| } |
| |
| void |
| regcache::debug_print_register (const char *func, int regno) |
| { |
| struct gdbarch *gdbarch = arch (); |
| |
| fprintf_unfiltered (gdb_stdlog, "%s ", func); |
| if (regno >= 0 && regno < gdbarch_num_regs (gdbarch) |
| && gdbarch_register_name (gdbarch, regno) != NULL |
| && gdbarch_register_name (gdbarch, regno)[0] != '\0') |
| fprintf_unfiltered (gdb_stdlog, "(%s)", |
| gdbarch_register_name (gdbarch, regno)); |
| else |
| fprintf_unfiltered (gdb_stdlog, "(%d)", regno); |
| if (regno >= 0 && regno < gdbarch_num_regs (gdbarch)) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| int size = register_size (gdbarch, regno); |
| gdb_byte *buf = register_buffer (regno); |
| |
| fprintf_unfiltered (gdb_stdlog, " = "); |
| for (int i = 0; i < size; i++) |
| { |
| fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
| } |
| if (size <= sizeof (LONGEST)) |
| { |
| ULONGEST val = extract_unsigned_integer (buf, size, byte_order); |
| |
| fprintf_unfiltered (gdb_stdlog, " %s %s", |
| core_addr_to_string_nz (val), plongest (val)); |
| } |
| } |
| fprintf_unfiltered (gdb_stdlog, "\n"); |
| } |
| |
| static void |
| reg_flush_command (const char *command, int from_tty) |
| { |
| /* Force-flush the register cache. */ |
| registers_changed (); |
| if (from_tty) |
| printf_filtered (_("Register cache flushed.\n")); |
| } |
| |
| void |
| register_dump::dump (ui_file *file) |
| { |
| auto descr = regcache_descr (m_gdbarch); |
| int regnum; |
| int footnote_nr = 0; |
| int footnote_register_offset = 0; |
| int footnote_register_type_name_null = 0; |
| long register_offset = 0; |
| |
| gdb_assert (descr->nr_cooked_registers |
| == (gdbarch_num_regs (m_gdbarch) |
| + gdbarch_num_pseudo_regs (m_gdbarch))); |
| |
| for (regnum = -1; regnum < descr->nr_cooked_registers; regnum++) |
| { |
| /* Name. */ |
| if (regnum < 0) |
| fprintf_unfiltered (file, " %-10s", "Name"); |
| else |
| { |
| const char *p = gdbarch_register_name (m_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 (m_gdbarch)) |
| fprintf_unfiltered (file, " %4d", regnum); |
| else |
| fprintf_unfiltered (file, " %4d", |
| (regnum - gdbarch_num_regs (m_gdbarch))); |
| |
| /* Offset. */ |
| if (regnum < 0) |
| fprintf_unfiltered (file, " %6s ", "Offset"); |
| else |
| { |
| fprintf_unfiltered (file, " %6ld", |
| descr->register_offset[regnum]); |
| if (register_offset != descr->register_offset[regnum] |
| || (regnum > 0 |
| && (descr->register_offset[regnum] |
| != (descr->register_offset[regnum - 1] |
| + 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 = (descr->register_offset[regnum] |
| + descr->sizeof_register[regnum]); |
| } |
| |
| /* Size. */ |
| if (regnum < 0) |
| fprintf_unfiltered (file, " %5s ", "Size"); |
| else |
| fprintf_unfiltered (file, " %5ld", descr->sizeof_register[regnum]); |
| |
| /* Type. */ |
| { |
| const char *t; |
| std::string name_holder; |
| |
| if (regnum < 0) |
| t = "Type"; |
| else |
| { |
| static const char blt[] = "builtin_type"; |
| |
| t = TYPE_NAME (register_type (m_gdbarch, regnum)); |
| if (t == NULL) |
| { |
| if (!footnote_register_type_name_null) |
| footnote_register_type_name_null = ++footnote_nr; |
| name_holder = string_printf ("*%d", |
| footnote_register_type_name_null); |
| t = name_holder.c_str (); |
| } |
| /* Chop a leading builtin_type. */ |
| if (startswith (t, blt)) |
| t += strlen (blt); |
| } |
| fprintf_unfiltered (file, " %-15s", t); |
| } |
| |
| /* Leading space always present. */ |
| fprintf_unfiltered (file, " "); |
| |
| dump_reg (file, regnum); |
| |
| fprintf_unfiltered (file, "\n"); |
| } |
| |
| 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); |
| } |
| |
| #if GDB_SELF_TEST |
| #include "selftest.h" |
| #include "selftest-arch.h" |
| #include "gdbthread.h" |
| #include "target-float.h" |
| |
| namespace selftests { |
| |
| class regcache_access : public regcache |
| { |
| public: |
| |
| /* Return the number of elements in current_regcache. */ |
| |
| static size_t |
| current_regcache_size () |
| { |
| return std::distance (regcache::current_regcache.begin (), |
| regcache::current_regcache.end ()); |
| } |
| }; |
| |
| static void |
| current_regcache_test (void) |
| { |
| /* It is empty at the start. */ |
| SELF_CHECK (regcache_access::current_regcache_size () == 0); |
| |
| ptid_t ptid1 (1), ptid2 (2), ptid3 (3); |
| |
| /* Get regcache from ptid1, a new regcache is added to |
| current_regcache. */ |
| regcache *regcache = get_thread_arch_aspace_regcache (ptid1, |
| target_gdbarch (), |
| NULL); |
| |
| SELF_CHECK (regcache != NULL); |
| SELF_CHECK (regcache->ptid () == ptid1); |
| SELF_CHECK (regcache_access::current_regcache_size () == 1); |
| |
| /* Get regcache from ptid2, a new regcache is added to |
| current_regcache. */ |
| regcache = get_thread_arch_aspace_regcache (ptid2, |
| target_gdbarch (), |
| NULL); |
| SELF_CHECK (regcache != NULL); |
| SELF_CHECK (regcache->ptid () == ptid2); |
| SELF_CHECK (regcache_access::current_regcache_size () == 2); |
| |
| /* Get regcache from ptid3, a new regcache is added to |
| current_regcache. */ |
| regcache = get_thread_arch_aspace_regcache (ptid3, |
| target_gdbarch (), |
| NULL); |
| SELF_CHECK (regcache != NULL); |
| SELF_CHECK (regcache->ptid () == ptid3); |
| SELF_CHECK (regcache_access::current_regcache_size () == 3); |
| |
| /* Get regcache from ptid2 again, nothing is added to |
| current_regcache. */ |
| regcache = get_thread_arch_aspace_regcache (ptid2, |
| target_gdbarch (), |
| NULL); |
| SELF_CHECK (regcache != NULL); |
| SELF_CHECK (regcache->ptid () == ptid2); |
| SELF_CHECK (regcache_access::current_regcache_size () == 3); |
| |
| /* Mark ptid2 is changed, so regcache of ptid2 should be removed from |
| current_regcache. */ |
| registers_changed_ptid (ptid2); |
| SELF_CHECK (regcache_access::current_regcache_size () == 2); |
| } |
| |
| static void test_target_fetch_registers (target_ops *self, regcache *regs, |
| int regno); |
| static void test_target_store_registers (target_ops *self, regcache *regs, |
| int regno); |
| static enum target_xfer_status |
| test_target_xfer_partial (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len); |
| |
| class target_ops_no_register : public test_target_ops |
| { |
| public: |
| target_ops_no_register () |
| : test_target_ops {} |
| { |
| to_fetch_registers = test_target_fetch_registers; |
| to_store_registers = test_target_store_registers; |
| to_xfer_partial = test_target_xfer_partial; |
| |
| to_data = this; |
| } |
| |
| void reset () |
| { |
| fetch_registers_called = 0; |
| store_registers_called = 0; |
| xfer_partial_called = 0; |
| } |
| |
| unsigned int fetch_registers_called = 0; |
| unsigned int store_registers_called = 0; |
| unsigned int xfer_partial_called = 0; |
| }; |
| |
| static void |
| test_target_fetch_registers (target_ops *self, regcache *regs, int regno) |
| { |
| auto ops = static_cast<target_ops_no_register *> (self->to_data); |
| |
| /* Mark register available. */ |
| regs->raw_supply_zeroed (regno); |
| ops->fetch_registers_called++; |
| } |
| |
| static void |
| test_target_store_registers (target_ops *self, regcache *regs, int regno) |
| { |
| auto ops = static_cast<target_ops_no_register *> (self->to_data); |
| |
| ops->store_registers_called++; |
| } |
| |
| static enum target_xfer_status |
| test_target_xfer_partial (struct target_ops *self, enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| { |
| auto ops = static_cast<target_ops_no_register *> (self->to_data); |
| |
| ops->xfer_partial_called++; |
| |
| *xfered_len = len; |
| return TARGET_XFER_OK; |
| } |
| |
| class readwrite_regcache : public regcache |
| { |
| public: |
| readwrite_regcache (struct gdbarch *gdbarch) |
| : regcache (gdbarch, nullptr) |
| {} |
| }; |
| |
| /* Test regcache::cooked_read gets registers from raw registers and |
| memory instead of target to_{fetch,store}_registers. */ |
| |
| static void |
| cooked_read_test (struct gdbarch *gdbarch) |
| { |
| /* Error out if debugging something, because we're going to push the |
| test target, which would pop any existing target. */ |
| if (current_target.to_stratum >= process_stratum) |
| error (_("target already pushed")); |
| |
| /* Create a mock environment. An inferior with a thread, with a |
| process_stratum target pushed. */ |
| |
| target_ops_no_register mock_target; |
| ptid_t mock_ptid (1, 1); |
| inferior mock_inferior (mock_ptid.pid ()); |
| address_space mock_aspace {}; |
| mock_inferior.gdbarch = gdbarch; |
| mock_inferior.aspace = &mock_aspace; |
| thread_info mock_thread (&mock_inferior, mock_ptid); |
| |
| scoped_restore restore_thread_list |
| = make_scoped_restore (&thread_list, &mock_thread); |
| |
| /* Add the mock inferior to the inferior list so that look ups by |
| target+ptid can find it. */ |
| scoped_restore restore_inferior_list |
| = make_scoped_restore (&inferior_list); |
| inferior_list = &mock_inferior; |
| |
| /* Switch to the mock inferior. */ |
| scoped_restore_current_inferior restore_current_inferior; |
| set_current_inferior (&mock_inferior); |
| |
| /* Push the process_stratum target so we can mock accessing |
| registers. */ |
| push_target (&mock_target); |
| |
| /* Pop it again on exit (return/exception). */ |
| struct on_exit |
| { |
| ~on_exit () |
| { |
| pop_all_targets_at_and_above (process_stratum); |
| } |
| } pop_targets; |
| |
| /* Switch to the mock thread. */ |
| scoped_restore restore_inferior_ptid |
| = make_scoped_restore (&inferior_ptid, mock_ptid); |
| |
| /* Test that read one raw register from regcache_no_target will go |
| to the target layer. */ |
| int regnum; |
| |
| /* Find a raw register which size isn't zero. */ |
| for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++) |
| { |
| if (register_size (gdbarch, regnum) != 0) |
| break; |
| } |
| |
| readwrite_regcache readwrite (gdbarch); |
| gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum)); |
| |
| readwrite.raw_read (regnum, buf.data ()); |
| |
| /* raw_read calls target_fetch_registers. */ |
| SELF_CHECK (mock_target.fetch_registers_called > 0); |
| mock_target.reset (); |
| |
| /* Mark all raw registers valid, so the following raw registers |
| accesses won't go to target. */ |
| for (auto i = 0; i < gdbarch_num_regs (gdbarch); i++) |
| readwrite.raw_update (i); |
| |
| mock_target.reset (); |
| /* Then, read all raw and pseudo registers, and don't expect calling |
| to_{fetch,store}_registers. */ |
| for (int regnum = 0; |
| regnum < gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
| regnum++) |
| { |
| if (register_size (gdbarch, regnum) == 0) |
| continue; |
| |
| gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum)); |
| |
| SELF_CHECK (REG_VALID == readwrite.cooked_read (regnum, buf.data ())); |
| |
| SELF_CHECK (mock_target.fetch_registers_called == 0); |
| SELF_CHECK (mock_target.store_registers_called == 0); |
| |
| /* Some SPU pseudo registers are got via TARGET_OBJECT_SPU. */ |
| if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu) |
| SELF_CHECK (mock_target.xfer_partial_called == 0); |
| |
| mock_target.reset (); |
| } |
| |
| readonly_detached_regcache readonly (readwrite); |
| |
| /* GDB may go to target layer to fetch all registers and memory for |
| readonly regcache. */ |
| mock_target.reset (); |
| |
| for (int regnum = 0; |
| regnum < gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
| regnum++) |
| { |
| if (register_size (gdbarch, regnum) == 0) |
| continue; |
| |
| gdb::def_vector<gdb_byte> buf (register_size (gdbarch, regnum)); |
| enum register_status status = readonly.cooked_read (regnum, |
| buf.data ()); |
| |
| if (regnum < gdbarch_num_regs (gdbarch)) |
| { |
| auto bfd_arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| |
| if (bfd_arch == bfd_arch_frv || bfd_arch == bfd_arch_h8300 |
| || bfd_arch == bfd_arch_m32c || bfd_arch == bfd_arch_sh |
| || bfd_arch == bfd_arch_alpha || bfd_arch == bfd_arch_v850 |
| || bfd_arch == bfd_arch_msp430 || bfd_arch == bfd_arch_mep |
| || bfd_arch == bfd_arch_mips || bfd_arch == bfd_arch_v850_rh850 |
| || bfd_arch == bfd_arch_tic6x || bfd_arch == bfd_arch_mn10300 |
| || bfd_arch == bfd_arch_rl78 || bfd_arch == bfd_arch_score |
| || bfd_arch == bfd_arch_riscv) |
| { |
| /* Raw registers. If raw registers are not in save_reggroup, |
| their status are unknown. */ |
| if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup)) |
| SELF_CHECK (status == REG_VALID); |
| else |
| SELF_CHECK (status == REG_UNKNOWN); |
| } |
| else |
| SELF_CHECK (status == REG_VALID); |
| } |
| else |
| { |
| if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup)) |
| SELF_CHECK (status == REG_VALID); |
| else |
| { |
| /* If pseudo registers are not in save_reggroup, some of |
| them can be computed from saved raw registers, but some |
| of them are unknown. */ |
| auto bfd_arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| |
| if (bfd_arch == bfd_arch_frv |
| || bfd_arch == bfd_arch_m32c |
| || bfd_arch == bfd_arch_mep |
| || bfd_arch == bfd_arch_sh) |
| SELF_CHECK (status == REG_VALID || status == REG_UNKNOWN); |
| else if (bfd_arch == bfd_arch_mips |
| || bfd_arch == bfd_arch_h8300) |
| SELF_CHECK (status == REG_UNKNOWN); |
| else |
| SELF_CHECK (status == REG_VALID); |
| } |
| } |
| |
| SELF_CHECK (mock_target.fetch_registers_called == 0); |
| SELF_CHECK (mock_target.store_registers_called == 0); |
| SELF_CHECK (mock_target.xfer_partial_called == 0); |
| |
| mock_target.reset (); |
| } |
| } |
| |
| /* Test regcache::cooked_write by writing some expected contents to |
| registers, and checking that contents read from registers and the |
| expected contents are the same. */ |
| |
| static void |
| cooked_write_test (struct gdbarch *gdbarch) |
| { |
| /* Error out if debugging something, because we're going to push the |
| test target, which would pop any existing target. */ |
| if (current_target.to_stratum >= process_stratum) |
| error (_("target already pushed")); |
| |
| /* Create a mock environment. A process_stratum target pushed. */ |
| |
| target_ops_no_register mock_target; |
| |
| /* Push the process_stratum target so we can mock accessing |
| registers. */ |
| push_target (&mock_target); |
| |
| /* Pop it again on exit (return/exception). */ |
| struct on_exit |
| { |
| ~on_exit () |
| { |
| pop_all_targets_at_and_above (process_stratum); |
| } |
| } pop_targets; |
| |
| readwrite_regcache readwrite (gdbarch); |
| |
| const int num_regs = (gdbarch_num_regs (gdbarch) |
| + gdbarch_num_pseudo_regs (gdbarch)); |
| |
| for (auto regnum = 0; regnum < num_regs; regnum++) |
| { |
| if (register_size (gdbarch, regnum) == 0 |
| || gdbarch_cannot_store_register (gdbarch, regnum)) |
| continue; |
| |
| auto bfd_arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| |
| if ((bfd_arch == bfd_arch_sparc |
| /* SPARC64_CWP_REGNUM, SPARC64_PSTATE_REGNUM, |
| SPARC64_ASI_REGNUM and SPARC64_CCR_REGNUM are hard to test. */ |
| && gdbarch_ptr_bit (gdbarch) == 64 |
| && (regnum >= gdbarch_num_regs (gdbarch) |
| && regnum <= gdbarch_num_regs (gdbarch) + 4)) |
| || (bfd_arch == bfd_arch_sh |
| /* FPSCR_C_REGNUM in sh64 is hard to test. */ |
| && gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_sh5 |
| && regnum == 243) |
| || (bfd_arch == bfd_arch_spu |
| /* SPU pseudo registers except SPU_SP_REGNUM are got by |
| TARGET_OBJECT_SPU. */ |
| && regnum >= gdbarch_num_regs (gdbarch) && regnum != 130)) |
| continue; |
| |
| std::vector<gdb_byte> expected (register_size (gdbarch, regnum), 0); |
| std::vector<gdb_byte> buf (register_size (gdbarch, regnum), 0); |
| const auto type = register_type (gdbarch, regnum); |
| |
| if (TYPE_CODE (type) == TYPE_CODE_FLT |
| || TYPE_CODE (type) == TYPE_CODE_DECFLOAT) |
| { |
| /* Generate valid float format. */ |
| target_float_from_string (expected.data (), type, "1.25"); |
| } |
| else if (TYPE_CODE (type) == TYPE_CODE_INT |
| || TYPE_CODE (type) == TYPE_CODE_ARRAY |
| || TYPE_CODE (type) == TYPE_CODE_PTR |
| || TYPE_CODE (type) == TYPE_CODE_UNION |
| || TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| { |
| if (bfd_arch == bfd_arch_ia64 |
| || (regnum >= gdbarch_num_regs (gdbarch) |
| && (bfd_arch == bfd_arch_xtensa |
| || bfd_arch == bfd_arch_bfin |
| || bfd_arch == bfd_arch_m32c |
| /* m68hc11 pseudo registers are in memory. */ |
| || bfd_arch == bfd_arch_m68hc11 |
| || bfd_arch == bfd_arch_m68hc12 |
| || bfd_arch == bfd_arch_s390)) |
| || (bfd_arch == bfd_arch_frv |
| /* FRV pseudo registers except iacc0. */ |
| && regnum > gdbarch_num_regs (gdbarch))) |
| { |
| /* Skip setting the expected values for some architecture |
| registers. */ |
| } |
| else if (bfd_arch == bfd_arch_rl78 && regnum == 40) |
| { |
| /* RL78_PC_REGNUM */ |
| for (auto j = 0; j < register_size (gdbarch, regnum) - 1; j++) |
| expected[j] = j; |
| } |
| else |
| { |
| for (auto j = 0; j < register_size (gdbarch, regnum); j++) |
| expected[j] = j; |
| } |
| } |
| else if (TYPE_CODE (type) == TYPE_CODE_FLAGS) |
| { |
| /* No idea how to test flags. */ |
| continue; |
| } |
| else |
| { |
| /* If we don't know how to create the expected value for the |
| this type, make it fail. */ |
| SELF_CHECK (0); |
| } |
| |
| readwrite.cooked_write (regnum, expected.data ()); |
| |
| SELF_CHECK (readwrite.cooked_read (regnum, buf.data ()) == REG_VALID); |
| SELF_CHECK (expected == buf); |
| } |
| } |
| |
| } // namespace selftests |
| #endif /* GDB_SELF_TEST */ |
| |
| 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::regcache_thread_ptid_changed); |
| |
| add_com ("flushregs", class_maintenance, reg_flush_command, |
| _("Force gdb to flush its register cache (maintainer command)")); |
| |
| #if GDB_SELF_TEST |
| selftests::register_test ("current_regcache", selftests::current_regcache_test); |
| |
| selftests::register_test_foreach_arch ("regcache::cooked_read_test", |
| selftests::cooked_read_test); |
| selftests::register_test_foreach_arch ("regcache::cooked_write_test", |
| selftests::cooked_write_test); |
| #endif |
| } |