/* Cache and manage the values of registers for GDB, the GNU debugger. Copyright (C) 1986-2022 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 . */ #include "defs.h" #include "inferior.h" #include "gdbthread.h" #include "target.h" #include "test-target.h" #include "scoped-mock-context.h" #include "gdbarch.h" #include "gdbcmd.h" #include "regcache.h" #include "reggroups.h" #include "observable.h" #include "regset.h" #include #include "cli/cli-cmds.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 regcache_descr { /* The architecture this descriptor belongs to. */ struct gdbarch *gdbarch = nullptr; /* 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 = 0; /* 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 = 0; long sizeof_cooked_registers = 0; /* 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 = nullptr; long *sizeof_register = nullptr; /* Cached table containing the type of each register. */ struct type **register_type = nullptr; }; static const registry::key regcache_descr_handle; static struct regcache_descr * init_regcache_descr (struct gdbarch *gdbarch) { int i; struct regcache_descr *descr; gdb_assert (gdbarch != NULL); /* Create an initial, zero filled, table. */ descr = new 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_cooked_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] = descr->register_type[i]->length (); 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] = descr->register_type[i]->length (); 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) { struct regcache_descr *result = regcache_descr_handle.get (gdbarch); if (result == nullptr) { result = init_regcache_descr (gdbarch); regcache_descr_handle.set (gdbarch, result); } return result; } /* 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_cooked_regs (gdbarch)); size = descr->sizeof_register[regnum]; return size; } /* See gdbsupport/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); /* We don't zero-initialize the M_REGISTERS array, as the bytes it contains aren't meaningful as long as the corresponding register status is not REG_VALID. */ if (has_pseudo) { m_registers.reset (new gdb_byte[m_descr->sizeof_cooked_registers]); m_register_status.reset (new register_status[m_descr->nr_cooked_registers] ()); } else { m_registers.reset (new gdb_byte[m_descr->sizeof_raw_registers]); m_register_status.reset (new register_status[gdbarch_num_regs (gdbarch)] ()); } } regcache::regcache (process_stratum_target *target, 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_target (target) { m_ptid = minus_one_ptid; } readonly_detached_regcache::readonly_detached_regcache (regcache &src) : readonly_detached_regcache (src.arch (), [&src] (int regnum, gdb_byte *buf) { return src.cooked_read (regnum, buf); }) { } gdbarch * reg_buffer::arch () const { return m_descr->gdbarch; } /* Return a pointer to register REGNUM's buffer cache. */ gdb_byte * reg_buffer::register_buffer (int regnum) const { return m_registers.get () + m_descr->register_offset[regnum]; } void reg_buffer::save (register_read_ftype cooked_read) { struct gdbarch *gdbarch = m_descr->gdbarch; int regnum; /* It should have pseudo registers. */ gdb_assert (m_has_pseudo); /* Clear the dest. */ memset (m_registers.get (), 0, m_descr->sizeof_cooked_registers); memset (m_register_status.get (), REG_UNKNOWN, 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 (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)); } } } /* See gdbsupport/common-regcache.h. */ enum register_status reg_buffer::get_register_status (int regnum) const { assert_regnum (regnum); return m_register_status[regnum]; } void reg_buffer::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 ())); } /* Type to map a ptid to a list of regcaches (one thread may have multiple regcaches, associated to different gdbarches). */ using ptid_regcache_map = std::unordered_multimap; /* Type holding regcaches for a given pid. */ using pid_ptid_regcache_map = std::unordered_map; /* Type holding regcaches for a given target. */ using target_pid_ptid_regcache_map = std::unordered_map; /* Global structure containing the existing regcaches. */ /* 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. */ static target_pid_ptid_regcache_map regcaches; struct regcache * get_thread_arch_aspace_regcache (process_stratum_target *target, ptid_t ptid, gdbarch *arch, struct address_space *aspace) { gdb_assert (target != nullptr); /* Find the map for this target. */ pid_ptid_regcache_map &pid_ptid_regc_map = regcaches[target]; /* Find the map for this pid. */ ptid_regcache_map &ptid_regc_map = pid_ptid_regc_map[ptid.pid ()]; /* Check first if a regcache for this arch already exists. */ auto range = ptid_regc_map.equal_range (ptid); for (auto it = range.first; it != range.second; ++it) { if (it->second->arch () == arch) return it->second.get (); } /* It does not exist, create it. */ regcache *new_regcache = new regcache (target, arch, aspace); new_regcache->set_ptid (ptid); /* Work around a problem with g++ 4.8 (PR96537): Call the regcache_up constructor explictly instead of implicitly. */ ptid_regc_map.insert (std::make_pair (ptid, regcache_up (new_regcache))); return new_regcache; } struct regcache * get_thread_arch_regcache (process_stratum_target *target, ptid_t ptid, struct gdbarch *gdbarch) { scoped_restore_current_inferior restore_current_inferior; set_current_inferior (find_inferior_ptid (target, ptid)); address_space *aspace = target_thread_address_space (ptid); return get_thread_arch_aspace_regcache (target, ptid, gdbarch, aspace); } static process_stratum_target *current_thread_target; static ptid_t current_thread_ptid; static struct gdbarch *current_thread_arch; struct regcache * get_thread_regcache (process_stratum_target *target, ptid_t ptid) { if (!current_thread_arch || target != current_thread_target || current_thread_ptid != ptid) { gdb_assert (ptid != null_ptid); current_thread_ptid = ptid; current_thread_target = target; scoped_restore_current_inferior restore_current_inferior; set_current_inferior (find_inferior_ptid (target, ptid)); current_thread_arch = target_thread_architecture (ptid); } return get_thread_arch_regcache (target, ptid, current_thread_arch); } /* See regcache.h. */ struct regcache * get_thread_regcache (thread_info *thread) { return get_thread_regcache (thread->inf->process_target (), thread->ptid); } struct regcache * get_current_regcache (void) { return get_thread_regcache (inferior_thread ()); } /* See gdbsupport/common-regcache.h. */ struct regcache * get_thread_regcache_for_ptid (ptid_t ptid) { /* This function doesn't take a process_stratum_target parameter because it's a gdbsupport/ routine implemented by both gdb and gdbserver. It always refers to a ptid of the current target. */ process_stratum_target *proc_target = current_inferior ()->process_target (); return get_thread_regcache (proc_target, ptid); } /* Observer for the target_changed event. */ static void regcache_observer_target_changed (struct target_ops *target) { registers_changed (); } /* Update regcaches related to OLD_PTID to now use NEW_PTID. */ static void regcache_thread_ptid_changed (process_stratum_target *target, ptid_t old_ptid, ptid_t new_ptid) { /* Look up map for target. */ auto pid_ptid_regc_map_it = regcaches.find (target); if (pid_ptid_regc_map_it == regcaches.end ()) return; /* Look up map for pid. */ pid_ptid_regcache_map &pid_ptid_regc_map = pid_ptid_regc_map_it->second; auto ptid_regc_map_it = pid_ptid_regc_map.find (old_ptid.pid ()); if (ptid_regc_map_it == pid_ptid_regc_map.end ()) return; /* Update all regcaches belonging to old_ptid. */ ptid_regcache_map &ptid_regc_map = ptid_regc_map_it->second; auto range = ptid_regc_map.equal_range (old_ptid); for (auto it = range.first; it != range.second;) { regcache_up rc = std::move (it->second); rc->set_ptid (new_ptid); /* Remove old before inserting new, to avoid rehashing, which would invalidate iterators. */ it = ptid_regc_map.erase (it); ptid_regc_map.insert (std::make_pair (new_ptid, std::move (rc))); } } /* 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 (process_stratum_target *target, ptid_t ptid) { if (target == nullptr) { /* Since there can be ptid clashes between targets, it's not valid to pass a ptid without saying to which target it belongs. */ gdb_assert (ptid == minus_one_ptid); /* Delete all the regcaches of all targets. */ regcaches.clear (); } else if (ptid.is_pid ()) { /* Non-NULL target and pid ptid, delete all regcaches belonging to this (TARGET, PID). */ /* Look up map for target. */ auto pid_ptid_regc_map_it = regcaches.find (target); if (pid_ptid_regc_map_it != regcaches.end ()) { pid_ptid_regcache_map &pid_ptid_regc_map = pid_ptid_regc_map_it->second; pid_ptid_regc_map.erase (ptid.pid ()); } } else if (ptid != minus_one_ptid) { /* Non-NULL target and non-minus_one_ptid, delete all regcaches belonging to this (TARGET, PTID). */ /* Look up map for target. */ auto pid_ptid_regc_map_it = regcaches.find (target); if (pid_ptid_regc_map_it != regcaches.end ()) { pid_ptid_regcache_map &pid_ptid_regc_map = pid_ptid_regc_map_it->second; /* Look up map for pid. */ auto ptid_regc_map_it = pid_ptid_regc_map.find (ptid.pid ()); if (ptid_regc_map_it != pid_ptid_regc_map.end ()) { ptid_regcache_map &ptid_regc_map = ptid_regc_map_it->second; ptid_regc_map.erase (ptid); } } } else { /* Non-NULL target and minus_one_ptid, delete all regcaches associated to this target. */ regcaches.erase (target); } if ((target == nullptr || current_thread_target == target) && current_thread_ptid.matches (ptid)) { current_thread_target = NULL; current_thread_ptid = null_ptid; current_thread_arch = NULL; } if ((target == nullptr || current_inferior ()->process_target () == target) && inferior_ptid.matches (ptid)) { /* We just deleted the regcache of the current thread. Need to forget about any frames we have cached, too. */ reinit_frame_cache (); } } /* See regcache.h. */ void registers_changed_thread (thread_info *thread) { registers_changed_ptid (thread->inf->process_target (), thread->ptid); } void registers_changed (void) { registers_changed_ptid (nullptr, minus_one_ptid); } 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 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 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 enum register_status readable_regcache::raw_read (int regnum, T *val) { assert_regnum (regnum); size_t len = m_descr->sizeof_register[regnum]; gdb_byte *buf = (gdb_byte *) alloca (len); register_status status = raw_read (regnum, buf); if (status == REG_VALID) *val = extract_integer ({buf, len}, 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 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 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 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).data (), 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 * 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).data ()) == REG_UNAVAILABLE) mark_value_bytes_unavailable (result, 0, value_type (result)->length ()); 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 enum register_status readable_regcache::cooked_read (int regnum, T *val) { gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers); size_t len = m_descr->sizeof_register[regnum]; gdb_byte *buf = (gdb_byte *) alloca (len); register_status status = cooked_read (regnum, buf); if (status == REG_VALID) *val = extract_integer ({buf, len}, 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 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 (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. */ auto invalidator = make_scope_exit ([&] { this->invalidate (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 (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); } /* See regcache.h. */ enum register_status readable_regcache::read_part (int regnum, int offset, int len, gdb_byte *out, bool is_raw) { int reg_size = register_size (arch (), regnum); gdb_assert (out != NULL); gdb_assert (offset >= 0 && offset <= reg_size); gdb_assert (len >= 0 && offset + len <= reg_size); if (offset == 0 && len == 0) { /* Nothing to do. */ return REG_VALID; } if (offset == 0 && len == reg_size) { /* Read the full register. */ return (is_raw) ? raw_read (regnum, out) : cooked_read (regnum, out); } enum register_status status; gdb_byte *reg = (gdb_byte *) alloca (reg_size); /* Read full register to buffer. */ status = (is_raw) ? raw_read (regnum, reg) : cooked_read (regnum, reg); if (status != REG_VALID) return status; /* Copy out. */ memcpy (out, reg + offset, len); return REG_VALID; } /* See regcache.h. */ void reg_buffer::raw_collect_part (int regnum, int offset, int len, gdb_byte *out) const { int reg_size = register_size (arch (), regnum); gdb_assert (out != nullptr); gdb_assert (offset >= 0 && offset <= reg_size); gdb_assert (len >= 0 && offset + len <= reg_size); if (offset == 0 && len == 0) { /* Nothing to do. */ return; } if (offset == 0 && len == reg_size) { /* Collect the full register. */ return raw_collect (regnum, out); } /* Read to buffer, then write out. */ gdb_byte *reg = (gdb_byte *) alloca (reg_size); raw_collect (regnum, reg); memcpy (out, reg + offset, len); } /* See regcache.h. */ enum register_status regcache::write_part (int regnum, int offset, int len, const gdb_byte *in, bool is_raw) { int reg_size = register_size (arch (), regnum); gdb_assert (in != NULL); gdb_assert (offset >= 0 && offset <= reg_size); gdb_assert (len >= 0 && offset + len <= reg_size); if (offset == 0 && len == 0) { /* Nothing to do. */ return REG_VALID; } if (offset == 0 && len == reg_size) { /* Write the full register. */ (is_raw) ? raw_write (regnum, in) : cooked_write (regnum, in); return REG_VALID; } enum register_status status; gdb_byte *reg = (gdb_byte *) alloca (reg_size); /* Read existing register to buffer. */ status = (is_raw) ? raw_read (regnum, reg) : cooked_read (regnum, reg); if (status != REG_VALID) return status; /* Update buffer, then write back to regcache. */ memcpy (reg + offset, in, len); is_raw ? raw_write (regnum, reg) : cooked_write (regnum, reg); return REG_VALID; } /* See regcache.h. */ void reg_buffer::raw_supply_part (int regnum, int offset, int len, const gdb_byte *in) { int reg_size = register_size (arch (), regnum); gdb_assert (in != nullptr); gdb_assert (offset >= 0 && offset <= reg_size); gdb_assert (len >= 0 && offset + len <= reg_size); if (offset == 0 && len == 0) { /* Nothing to do. */ return; } if (offset == 0 && len == reg_size) { /* Supply the full register. */ return raw_supply (regnum, in); } gdb_byte *reg = (gdb_byte *) alloca (reg_size); /* Read existing value to buffer. */ raw_collect (regnum, reg); /* Write to buffer, then write out. */ memcpy (reg + offset, in, len); raw_supply (regnum, reg); } 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); } /* See regcache.h. */ 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); } /* See regcache.h. */ 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); } /* See regcache.h. */ 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); } /* See gdbsupport/common-regcache.h. */ void reg_buffer::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; } } /* See regcache.h. */ void reg_buffer::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; } /* See regcache.h. */ void reg_buffer::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; } /* See gdbsupport/common-regcache.h. */ void reg_buffer::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); } /* See regcache.h. */ void reg_buffer::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); } /* See regcache.h. */ void regcache::transfer_regset_register (struct regcache *out_regcache, int regnum, const gdb_byte *in_buf, gdb_byte *out_buf, int slot_size, int offs) const { struct gdbarch *gdbarch = arch (); int reg_size = std::min (register_size (gdbarch, regnum), slot_size); /* Use part versions and reg_size to prevent possible buffer overflows when accessing the regcache. */ if (out_buf != nullptr) { raw_collect_part (regnum, 0, reg_size, out_buf + offs); /* Ensure any additional space is cleared. */ if (slot_size > reg_size) memset (out_buf + offs + reg_size, 0, slot_size - reg_size); } else if (in_buf != nullptr) { /* Zero-extend the register value if the slot is smaller than the register. */ if (slot_size < register_size (gdbarch, regnum)) out_regcache->raw_supply_zeroed (regnum); out_regcache->raw_supply_part (regnum, 0, reg_size, in_buf + offs); } else { /* Invalidate the register. */ out_regcache->raw_supply (regnum, nullptr); } } /* See regcache.h. */ void regcache::transfer_regset (const struct regset *regset, struct regcache *out_regcache, int regnum, const gdb_byte *in_buf, gdb_byte *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; transfer_regset_register (out_regcache, regno, in_buf, out_buf, slot_size, offs); } else { /* Transfer a single register and return. */ offs += (regnum - regno) * slot_size; if (offs + slot_size > size) return; transfer_regset_register (out_regcache, regnum, in_buf, out_buf, slot_size, offs); 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, (const gdb_byte *) buf, size); } void regcache::supply_regset (const struct regset *regset, int regnum, const void *buf, size_t size) { transfer_regset (regset, this, regnum, (const gdb_byte *) buf, nullptr, 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, (gdb_byte *) buf, size); } void regcache::collect_regset (const struct regset *regset, int regnum, void *buf, size_t size) const { transfer_regset (regset, nullptr, regnum, nullptr, (gdb_byte *) buf, size); } /* See regcache.h */ bool regcache_map_supplies (const struct regcache_map_entry *map, int regnum, struct gdbarch *gdbarch, size_t size) { int offs = 0, count; for (; (count = map->count) != 0; map++) { int regno = map->regno; int slot_size = map->size; if (slot_size == 0 && regno != REGCACHE_MAP_SKIP) slot_size = register_size (gdbarch, regno); if (regno != REGCACHE_MAP_SKIP && regnum >= regno && regnum < regno + count) return offs + (regnum - regno + 1) * slot_size <= size; offs += count * slot_size; if (offs >= size) return false; } return false; } /* See gdbsupport/common-regcache.h. */ bool reg_buffer::raw_compare (int regnum, const void *buf, int offset) const { gdb_assert (buf != NULL); assert_regnum (regnum); const char *regbuf = (const char *) register_buffer (regnum); size_t size = m_descr->sizeof_register[regnum]; gdb_assert (size >= offset); return (memcmp (buf, regbuf + offset, size - offset) == 0); } /* 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; } /* See gdbsupport/common-regcache.h. */ CORE_ADDR regcache_read_pc_protected (regcache *regcache) { CORE_ADDR pc; try { pc = regcache_read_pc (regcache); } catch (const gdb_exception_error &ex) { pc = 0; } return pc; } 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 (); gdb_printf (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') gdb_printf (gdb_stdlog, "(%s)", gdbarch_register_name (gdbarch, regno)); else gdb_printf (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); gdb_printf (gdb_stdlog, " = "); for (int i = 0; i < size; i++) { gdb_printf (gdb_stdlog, "%02x", buf[i]); } if (size <= sizeof (LONGEST)) { ULONGEST val = extract_unsigned_integer (buf, size, byte_order); gdb_printf (gdb_stdlog, " %s %s", core_addr_to_string_nz (val), plongest (val)); } } gdb_printf (gdb_stdlog, "\n"); } /* Implement 'maint flush register-cache' command. */ static void reg_flush_command (const char *command, int from_tty) { /* Force-flush the register cache. */ registers_changed (); if (from_tty) gdb_printf (_("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_cooked_regs (m_gdbarch)); for (regnum = -1; regnum < descr->nr_cooked_registers; regnum++) { /* Name. */ if (regnum < 0) gdb_printf (file, " %-10s", "Name"); else { const char *p = gdbarch_register_name (m_gdbarch, regnum); if (p == NULL) p = ""; else if (p[0] == '\0') p = "''"; gdb_printf (file, " %-10s", p); } /* Number. */ if (regnum < 0) gdb_printf (file, " %4s", "Nr"); else gdb_printf (file, " %4d", regnum); /* Relative number. */ if (regnum < 0) gdb_printf (file, " %4s", "Rel"); else if (regnum < gdbarch_num_regs (m_gdbarch)) gdb_printf (file, " %4d", regnum); else gdb_printf (file, " %4d", (regnum - gdbarch_num_regs (m_gdbarch))); /* Offset. */ if (regnum < 0) gdb_printf (file, " %6s ", "Offset"); else { gdb_printf (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; gdb_printf (file, "*%d", footnote_register_offset); } else gdb_printf (file, " "); register_offset = (descr->register_offset[regnum] + descr->sizeof_register[regnum]); } /* Size. */ if (regnum < 0) gdb_printf (file, " %5s ", "Size"); else gdb_printf (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 = register_type (m_gdbarch, regnum)->name (); 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); } gdb_printf (file, " %-15s", t); } /* Leading space always present. */ gdb_printf (file, " "); dump_reg (file, regnum); gdb_printf (file, "\n"); } if (footnote_register_offset) gdb_printf (file, "*%d: Inconsistent register offsets.\n", footnote_register_offset); if (footnote_register_type_name_null) gdb_printf (file, "*%d: Register type's name NULL.\n", footnote_register_type_name_null); } #if GDB_SELF_TEST #include "gdbsupport/selftest.h" #include "selftest-arch.h" #include "target-float.h" namespace selftests { static size_t regcaches_size () { size_t size = 0; for (auto pid_ptid_regc_map_it = regcaches.cbegin (); pid_ptid_regc_map_it != regcaches.cend (); ++pid_ptid_regc_map_it) { const pid_ptid_regcache_map &pid_ptid_regc_map = pid_ptid_regc_map_it->second; for (auto ptid_regc_map_it = pid_ptid_regc_map.cbegin (); ptid_regc_map_it != pid_ptid_regc_map.cend (); ++ptid_regc_map_it) { const ptid_regcache_map &ptid_regc_map = ptid_regc_map_it->second; size += ptid_regc_map.size (); } } return size; } /* Return the count of regcaches for (TARGET, PTID) in REGCACHES. */ static int regcache_count (process_stratum_target *target, ptid_t ptid) { /* Look up map for target. */ auto pid_ptid_regc_map_it = regcaches.find (target); if (pid_ptid_regc_map_it != regcaches.end ()) { pid_ptid_regcache_map &pid_ptid_regc_map = pid_ptid_regc_map_it->second; /* Look map for pid. */ auto ptid_regc_map_it = pid_ptid_regc_map.find (ptid.pid ()); if (ptid_regc_map_it != pid_ptid_regc_map.end ()) { ptid_regcache_map &ptid_regc_map = ptid_regc_map_it->second; auto range = ptid_regc_map.equal_range (ptid); return std::distance (range.first, range.second); } } return 0; }; /* Wrapper around get_thread_arch_aspace_regcache that does some self checks. */ static void get_thread_arch_aspace_regcache_and_check (process_stratum_target *target, ptid_t ptid) { /* We currently only test with a single gdbarch. Any gdbarch will do, so use the current inferior's gdbarch. Also use the current inferior's address space. */ gdbarch *arch = current_inferior ()->gdbarch; address_space *aspace = current_inferior ()->aspace; regcache *regcache = get_thread_arch_aspace_regcache (target, ptid, arch, aspace); SELF_CHECK (regcache != NULL); SELF_CHECK (regcache->target () == target); SELF_CHECK (regcache->ptid () == ptid); SELF_CHECK (regcache->arch () == arch); SELF_CHECK (regcache->aspace () == aspace); } /* The data that the regcaches selftests must hold onto for the duration of the test. */ struct regcache_test_data { regcache_test_data () { /* Ensure the regcaches container is empty at the start. */ registers_changed (); } ~regcache_test_data () { /* Make sure to leave the global regcaches container empty. */ registers_changed (); } test_target_ops test_target1; test_target_ops test_target2; }; using regcache_test_data_up = std::unique_ptr; /* Set up a few regcaches from two different targets, for use in regcache-management tests. Return a pointer, because the `regcache_test_data` type is not moveable. */ static regcache_test_data_up populate_regcaches_for_test () { regcache_test_data_up data (new regcache_test_data); size_t expected_regcache_size = 0; SELF_CHECK (regcaches_size () == 0); /* Populate the regcache container with a few regcaches for the two test targets. */ for (int pid : { 1, 2 }) { for (long lwp : { 1, 2, 3 }) { get_thread_arch_aspace_regcache_and_check (&data->test_target1, ptid_t (pid, lwp)); expected_regcache_size++; SELF_CHECK (regcaches_size () == expected_regcache_size); get_thread_arch_aspace_regcache_and_check (&data->test_target2, ptid_t (pid, lwp)); expected_regcache_size++; SELF_CHECK (regcaches_size () == expected_regcache_size); } } return data; } static void get_thread_arch_aspace_regcache_test () { /* populate_regcaches_for_test already tests most of the get_thread_arch_aspace_regcache functionality. */ regcache_test_data_up data = populate_regcaches_for_test (); size_t regcaches_size_before = regcaches_size (); /* Test that getting an existing regcache doesn't create a new one. */ get_thread_arch_aspace_regcache_and_check (&data->test_target1, ptid_t (2, 2)); SELF_CHECK (regcaches_size () == regcaches_size_before); } /* Test marking all regcaches of all targets as changed. */ static void registers_changed_ptid_all_test () { regcache_test_data_up data = populate_regcaches_for_test (); registers_changed_ptid (nullptr, minus_one_ptid); SELF_CHECK (regcaches_size () == 0); } /* Test marking regcaches of a specific target as changed. */ static void registers_changed_ptid_target_test () { regcache_test_data_up data = populate_regcaches_for_test (); registers_changed_ptid (&data->test_target1, minus_one_ptid); SELF_CHECK (regcaches_size () == 6); /* Check that we deleted the regcache for the right target. */ SELF_CHECK (regcache_count (&data->test_target1, ptid_t (2, 2)) == 0); SELF_CHECK (regcache_count (&data->test_target2, ptid_t (2, 2)) == 1); } /* Test marking regcaches of a specific (target, pid) as changed. */ static void registers_changed_ptid_target_pid_test () { regcache_test_data_up data = populate_regcaches_for_test (); registers_changed_ptid (&data->test_target1, ptid_t (2)); SELF_CHECK (regcaches_size () == 9); /* Regcaches from target1 should not exist, while regcaches from target2 should exist. */ SELF_CHECK (regcache_count (&data->test_target1, ptid_t (2, 2)) == 0); SELF_CHECK (regcache_count (&data->test_target2, ptid_t (2, 2)) == 1); } /* Test marking regcaches of a specific (target, ptid) as changed. */ static void registers_changed_ptid_target_ptid_test () { regcache_test_data_up data = populate_regcaches_for_test (); registers_changed_ptid (&data->test_target1, ptid_t (2, 2)); SELF_CHECK (regcaches_size () == 11); /* Check that we deleted the regcache for the right target. */ SELF_CHECK (regcache_count (&data->test_target1, ptid_t (2, 2)) == 0); SELF_CHECK (regcache_count (&data->test_target2, ptid_t (2, 2)) == 1); } class target_ops_no_register : public test_target_ops { public: target_ops_no_register () : test_target_ops {} {} void reset () { fetch_registers_called = 0; store_registers_called = 0; xfer_partial_called = 0; } void fetch_registers (regcache *regs, int regno) override; void store_registers (regcache *regs, int regno) override; enum target_xfer_status xfer_partial (enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) override; unsigned int fetch_registers_called = 0; unsigned int store_registers_called = 0; unsigned int xfer_partial_called = 0; }; void target_ops_no_register::fetch_registers (regcache *regs, int regno) { /* Mark register available. */ regs->raw_supply_zeroed (regno); this->fetch_registers_called++; } void target_ops_no_register::store_registers (regcache *regs, int regno) { this->store_registers_called++; } enum target_xfer_status target_ops_no_register::xfer_partial (enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) { this->xfer_partial_called++; *xfered_len = len; return TARGET_XFER_OK; } class readwrite_regcache : public regcache { public: readwrite_regcache (process_stratum_target *target, struct gdbarch *gdbarch) : regcache (target, gdbarch, nullptr) {} }; /* Return true if regcache::cooked_{read,write}_test should be skipped for GDBARCH. */ static bool selftest_skiparch (struct gdbarch *gdbarch) { const char *name = gdbarch_bfd_arch_info (gdbarch)->printable_name; /* Avoid warning: Running selftest regcache::cooked_{read,write}_test::m68hc11. warning: No frame soft register found in the symbol table. Stack backtrace will not work. We could instead capture the output and then filter out the warning, but that seems more trouble than it's worth. */ return (strcmp (name, "m68hc11") == 0 || strcmp (name, "m68hc12") == 0 || strcmp (name, "m68hc12:HCS12") == 0); } /* 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) { if (selftest_skiparch (gdbarch)) return; scoped_mock_context mockctx (gdbarch); /* Test that read one raw register from regcache_no_target will go to the target layer. */ /* Find a raw register which size isn't zero. */ int nonzero_regnum; for (nonzero_regnum = 0; nonzero_regnum < gdbarch_num_regs (gdbarch); nonzero_regnum++) { if (register_size (gdbarch, nonzero_regnum) != 0) break; } readwrite_regcache readwrite (&mockctx.mock_target, gdbarch); gdb::def_vector buf (register_size (gdbarch, nonzero_regnum)); readwrite.raw_read (nonzero_regnum, buf.data ()); /* raw_read calls target_fetch_registers. */ SELF_CHECK (mockctx.mock_target.fetch_registers_called > 0); mockctx.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); mockctx.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_cooked_regs (gdbarch); regnum++) { if (register_size (gdbarch, regnum) == 0) continue; gdb::def_vector inner_buf (register_size (gdbarch, regnum)); SELF_CHECK (REG_VALID == readwrite.cooked_read (regnum, inner_buf.data ())); SELF_CHECK (mockctx.mock_target.fetch_registers_called == 0); SELF_CHECK (mockctx.mock_target.store_registers_called == 0); SELF_CHECK (mockctx.mock_target.xfer_partial_called == 0); mockctx.mock_target.reset (); } readonly_detached_regcache readonly (readwrite); /* GDB may go to target layer to fetch all registers and memory for readonly regcache. */ mockctx.mock_target.reset (); for (int regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++) { if (register_size (gdbarch, regnum) == 0) continue; gdb::def_vector inner_buf (register_size (gdbarch, regnum)); enum register_status status = readonly.cooked_read (regnum, inner_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 || bfd_arch == bfd_arch_csky) { /* 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 (mockctx.mock_target.fetch_registers_called == 0); SELF_CHECK (mockctx.mock_target.store_registers_called == 0); SELF_CHECK (mockctx.mock_target.xfer_partial_called == 0); mockctx.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) { if (selftest_skiparch (gdbarch)) return; /* Create a mock environment. A process_stratum target pushed. */ scoped_mock_context ctx (gdbarch); readwrite_regcache readwrite (&ctx.mock_target, gdbarch); const int num_regs = gdbarch_num_cooked_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)) continue; std::vector expected (register_size (gdbarch, regnum), 0); std::vector buf (register_size (gdbarch, regnum), 0); const auto type = register_type (gdbarch, regnum); if (type->code () == TYPE_CODE_FLT || type->code () == TYPE_CODE_DECFLOAT) { /* Generate valid float format. */ target_float_from_string (expected.data (), type, "1.25"); } else if (type->code () == TYPE_CODE_INT || type->code () == TYPE_CODE_ARRAY || type->code () == TYPE_CODE_PTR || type->code () == TYPE_CODE_UNION || type->code () == 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_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); } } /* Verify that when two threads with the same ptid exist (from two different targets) and one of them changes ptid, we only update the appropriate regcaches. */ static void regcache_thread_ptid_changed () { /* This test relies on the global regcache list to initially be empty. */ registers_changed (); /* Any arch will do. */ gdbarch *arch = current_inferior ()->gdbarch; /* Prepare two targets with one thread each, with the same ptid. */ scoped_mock_context target1 (arch); scoped_mock_context target2 (arch); ptid_t old_ptid (111, 222); ptid_t new_ptid (111, 333); target1.mock_inferior.pid = old_ptid.pid (); target1.mock_thread.ptid = old_ptid; target1.mock_inferior.ptid_thread_map.clear (); target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; target2.mock_inferior.pid = old_ptid.pid (); target2.mock_thread.ptid = old_ptid; target2.mock_inferior.ptid_thread_map.clear (); target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; gdb_assert (regcaches.empty ()); /* Populate the regcaches container. */ get_thread_arch_aspace_regcache (&target1.mock_target, old_ptid, arch, nullptr); get_thread_arch_aspace_regcache (&target2.mock_target, old_ptid, arch, nullptr); gdb_assert (regcaches.size () == 2); gdb_assert (regcache_count (&target1.mock_target, old_ptid) == 1); gdb_assert (regcache_count (&target1.mock_target, new_ptid) == 0); gdb_assert (regcache_count (&target2.mock_target, old_ptid) == 1); gdb_assert (regcache_count (&target2.mock_target, new_ptid) == 0); thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); gdb_assert (regcaches.size () == 2); gdb_assert (regcache_count (&target1.mock_target, old_ptid) == 0); gdb_assert (regcache_count (&target1.mock_target, new_ptid) == 1); gdb_assert (regcache_count (&target2.mock_target, old_ptid) == 1); gdb_assert (regcache_count (&target2.mock_target, new_ptid) == 0); /* Leave the regcache list empty. */ registers_changed (); gdb_assert (regcaches.empty ()); } } // namespace selftests #endif /* GDB_SELF_TEST */ void _initialize_regcache (); void _initialize_regcache () { struct cmd_list_element *c; gdb::observers::target_changed.attach (regcache_observer_target_changed, "regcache"); gdb::observers::thread_ptid_changed.attach (regcache_thread_ptid_changed, "regcache"); cmd_list_element *maintenance_flush_register_cache_cmd = add_cmd ("register-cache", class_maintenance, reg_flush_command, _("Force gdb to flush its register and frame cache."), &maintenanceflushlist); c = add_com_alias ("flushregs", maintenance_flush_register_cache_cmd, class_maintenance, 0); deprecate_cmd (c, "maintenance flush register-cache"); #if GDB_SELF_TEST selftests::register_test ("get_thread_arch_aspace_regcache", selftests::get_thread_arch_aspace_regcache_test); selftests::register_test ("registers_changed_ptid_all", selftests::registers_changed_ptid_all_test); selftests::register_test ("registers_changed_ptid_target", selftests::registers_changed_ptid_target_test); selftests::register_test ("registers_changed_ptid_target_pid", selftests::registers_changed_ptid_target_pid_test); selftests::register_test ("registers_changed_ptid_target_ptid", selftests::registers_changed_ptid_target_ptid_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); selftests::register_test ("regcache_thread_ptid_changed", selftests::regcache_thread_ptid_changed); #endif }