diff options
Diffstat (limited to 'gdbserver/regcache.cc')
| -rw-r--r-- | gdbserver/regcache.cc | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/gdbserver/regcache.cc b/gdbserver/regcache.cc new file mode 100644 index 0000000..f634633 --- /dev/null +++ b/gdbserver/regcache.cc @@ -0,0 +1,528 @@ +/* Register support routines for the remote server for GDB. + Copyright (C) 2001-2020 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 "server.h" +#include "regdef.h" +#include "gdbthread.h" +#include "tdesc.h" +#include "gdbsupport/rsp-low.h" +#ifndef IN_PROCESS_AGENT + +struct regcache * +get_thread_regcache (struct thread_info *thread, int fetch) +{ + struct regcache *regcache; + + regcache = thread_regcache_data (thread); + + /* Threads' regcaches are created lazily, because biarch targets add + the main thread/lwp before seeing it stop for the first time, and + it is only after the target sees the thread stop for the first + time that the target has a chance of determining the process's + architecture. IOW, when we first add the process's main thread + we don't know which architecture/tdesc its regcache should + have. */ + if (regcache == NULL) + { + struct process_info *proc = get_thread_process (thread); + + gdb_assert (proc->tdesc != NULL); + + regcache = new_register_cache (proc->tdesc); + set_thread_regcache_data (thread, regcache); + } + + if (fetch && regcache->registers_valid == 0) + { + struct thread_info *saved_thread = current_thread; + + current_thread = thread; + /* Invalidate all registers, to prevent stale left-overs. */ + memset (regcache->register_status, REG_UNAVAILABLE, + regcache->tdesc->reg_defs.size ()); + fetch_inferior_registers (regcache, -1); + current_thread = saved_thread; + regcache->registers_valid = 1; + } + + return regcache; +} + +/* See gdbsupport/common-regcache.h. */ + +struct regcache * +get_thread_regcache_for_ptid (ptid_t ptid) +{ + return get_thread_regcache (find_thread_ptid (ptid), 1); +} + +void +regcache_invalidate_thread (struct thread_info *thread) +{ + struct regcache *regcache; + + regcache = thread_regcache_data (thread); + + if (regcache == NULL) + return; + + if (regcache->registers_valid) + { + struct thread_info *saved_thread = current_thread; + + current_thread = thread; + store_inferior_registers (regcache, -1); + current_thread = saved_thread; + } + + regcache->registers_valid = 0; +} + +/* See regcache.h. */ + +void +regcache_invalidate_pid (int pid) +{ + /* Only invalidate the regcaches of threads of this process. */ + for_each_thread (pid, regcache_invalidate_thread); +} + +/* See regcache.h. */ + +void +regcache_invalidate (void) +{ + /* Only update the threads of the current process. */ + int pid = current_thread->id.pid (); + + regcache_invalidate_pid (pid); +} + +#endif + +struct regcache * +init_register_cache (struct regcache *regcache, + const struct target_desc *tdesc, + unsigned char *regbuf) +{ + if (regbuf == NULL) + { +#ifndef IN_PROCESS_AGENT + /* Make sure to zero-initialize the register cache when it is + created, in case there are registers the target never + fetches. This way they'll read as zero instead of + garbage. */ + regcache->tdesc = tdesc; + regcache->registers + = (unsigned char *) xcalloc (1, tdesc->registers_size); + regcache->registers_owned = 1; + regcache->register_status + = (unsigned char *) xmalloc (tdesc->reg_defs.size ()); + memset ((void *) regcache->register_status, REG_UNAVAILABLE, + tdesc->reg_defs.size ()); +#else + gdb_assert_not_reached ("can't allocate memory from the heap"); +#endif + } + else + { + regcache->tdesc = tdesc; + regcache->registers = regbuf; + regcache->registers_owned = 0; +#ifndef IN_PROCESS_AGENT + regcache->register_status = NULL; +#endif + } + + regcache->registers_valid = 0; + + return regcache; +} + +#ifndef IN_PROCESS_AGENT + +struct regcache * +new_register_cache (const struct target_desc *tdesc) +{ + struct regcache *regcache = new struct regcache; + + gdb_assert (tdesc->registers_size != 0); + + return init_register_cache (regcache, tdesc, NULL); +} + +void +free_register_cache (struct regcache *regcache) +{ + if (regcache) + { + if (regcache->registers_owned) + free (regcache->registers); + free (regcache->register_status); + delete regcache; + } +} + +#endif + +void +regcache_cpy (struct regcache *dst, struct regcache *src) +{ + gdb_assert (src != NULL && dst != NULL); + gdb_assert (src->tdesc == dst->tdesc); + gdb_assert (src != dst); + + memcpy (dst->registers, src->registers, src->tdesc->registers_size); +#ifndef IN_PROCESS_AGENT + if (dst->register_status != NULL && src->register_status != NULL) + memcpy (dst->register_status, src->register_status, + src->tdesc->reg_defs.size ()); +#endif + dst->registers_valid = src->registers_valid; +} + +/* Return a reference to the description of register N. */ + +static const struct reg & +find_register_by_number (const struct target_desc *tdesc, int n) +{ + return tdesc->reg_defs[n]; +} + +#ifndef IN_PROCESS_AGENT + +void +registers_to_string (struct regcache *regcache, char *buf) +{ + unsigned char *registers = regcache->registers; + const struct target_desc *tdesc = regcache->tdesc; + + for (int i = 0; i < tdesc->reg_defs.size (); ++i) + { + if (regcache->register_status[i] == REG_VALID) + { + bin2hex (registers, buf, register_size (tdesc, i)); + buf += register_size (tdesc, i) * 2; + } + else + { + memset (buf, 'x', register_size (tdesc, i) * 2); + buf += register_size (tdesc, i) * 2; + } + registers += register_size (tdesc, i); + } + *buf = '\0'; +} + +void +registers_from_string (struct regcache *regcache, char *buf) +{ + int len = strlen (buf); + unsigned char *registers = regcache->registers; + const struct target_desc *tdesc = regcache->tdesc; + + if (len != tdesc->registers_size * 2) + { + warning ("Wrong sized register packet (expected %d bytes, got %d)", + 2 * tdesc->registers_size, len); + if (len > tdesc->registers_size * 2) + len = tdesc->registers_size * 2; + } + hex2bin (buf, registers, len / 2); +} + +int +find_regno (const struct target_desc *tdesc, const char *name) +{ + for (int i = 0; i < tdesc->reg_defs.size (); ++i) + { + if (strcmp (name, find_register_by_number (tdesc, i).name) == 0) + return i; + } + internal_error (__FILE__, __LINE__, "Unknown register %s requested", + name); +} + +static void +free_register_cache_thread (struct thread_info *thread) +{ + struct regcache *regcache = thread_regcache_data (thread); + + if (regcache != NULL) + { + regcache_invalidate_thread (thread); + free_register_cache (regcache); + set_thread_regcache_data (thread, NULL); + } +} + +void +regcache_release (void) +{ + /* Flush and release all pre-existing register caches. */ + for_each_thread (free_register_cache_thread); +} +#endif + +int +register_cache_size (const struct target_desc *tdesc) +{ + return tdesc->registers_size; +} + +int +register_size (const struct target_desc *tdesc, int n) +{ + return find_register_by_number (tdesc, n).size / 8; +} + +/* See gdbsupport/common-regcache.h. */ + +int +regcache_register_size (const struct regcache *regcache, int n) +{ + return register_size (regcache->tdesc, n); +} + +static unsigned char * +register_data (const struct regcache *regcache, int n, int fetch) +{ + return (regcache->registers + + find_register_by_number (regcache->tdesc, n).offset / 8); +} + +void +supply_register (struct regcache *regcache, int n, const void *buf) +{ + return regcache->raw_supply (n, buf); +} + +/* See gdbsupport/common-regcache.h. */ + +void +regcache::raw_supply (int n, const void *buf) +{ + if (buf) + { + memcpy (register_data (this, n, 0), buf, register_size (tdesc, n)); +#ifndef IN_PROCESS_AGENT + if (register_status != NULL) + register_status[n] = REG_VALID; +#endif + } + else + { + memset (register_data (this, n, 0), 0, register_size (tdesc, n)); +#ifndef IN_PROCESS_AGENT + if (register_status != NULL) + register_status[n] = REG_UNAVAILABLE; +#endif + } +} + +/* Supply register N with value zero to REGCACHE. */ + +void +supply_register_zeroed (struct regcache *regcache, int n) +{ + memset (register_data (regcache, n, 0), 0, + register_size (regcache->tdesc, n)); +#ifndef IN_PROCESS_AGENT + if (regcache->register_status != NULL) + regcache->register_status[n] = REG_VALID; +#endif +} + +#ifndef IN_PROCESS_AGENT + +/* Supply register called NAME with value zero to REGCACHE. */ + +void +supply_register_by_name_zeroed (struct regcache *regcache, + const char *name) +{ + supply_register_zeroed (regcache, find_regno (regcache->tdesc, name)); +} + +#endif + +/* Supply the whole register set whose contents are stored in BUF, to + REGCACHE. If BUF is NULL, all the registers' values are recorded + as unavailable. */ + +void +supply_regblock (struct regcache *regcache, const void *buf) +{ + if (buf) + { + const struct target_desc *tdesc = regcache->tdesc; + + memcpy (regcache->registers, buf, tdesc->registers_size); +#ifndef IN_PROCESS_AGENT + { + int i; + + for (i = 0; i < tdesc->reg_defs.size (); i++) + regcache->register_status[i] = REG_VALID; + } +#endif + } + else + { + const struct target_desc *tdesc = regcache->tdesc; + + memset (regcache->registers, 0, tdesc->registers_size); +#ifndef IN_PROCESS_AGENT + { + int i; + + for (i = 0; i < tdesc->reg_defs.size (); i++) + regcache->register_status[i] = REG_UNAVAILABLE; + } +#endif + } +} + +#ifndef IN_PROCESS_AGENT + +void +supply_register_by_name (struct regcache *regcache, + const char *name, const void *buf) +{ + supply_register (regcache, find_regno (regcache->tdesc, name), buf); +} + +#endif + +void +collect_register (struct regcache *regcache, int n, void *buf) +{ + regcache->raw_collect (n, buf); +} + +/* See gdbsupport/common-regcache.h. */ + +void +regcache::raw_collect (int n, void *buf) const +{ + memcpy (buf, register_data (this, n, 1), register_size (tdesc, n)); +} + +enum register_status +regcache_raw_read_unsigned (struct regcache *regcache, int regnum, + ULONGEST *val) +{ + int size; + + gdb_assert (regcache != NULL); + gdb_assert (regnum >= 0 + && regnum < regcache->tdesc->reg_defs.size ()); + + size = register_size (regcache->tdesc, regnum); + + if (size > (int) sizeof (ULONGEST)) + error (_("That operation is not available on integers of more than" + "%d bytes."), + (int) sizeof (ULONGEST)); + + *val = 0; + collect_register (regcache, regnum, val); + + return REG_VALID; +} + +#ifndef IN_PROCESS_AGENT + +/* See regcache.h. */ + +ULONGEST +regcache_raw_get_unsigned_by_name (struct regcache *regcache, + const char *name) +{ + return regcache_raw_get_unsigned (regcache, + find_regno (regcache->tdesc, name)); +} + +void +collect_register_as_string (struct regcache *regcache, int n, char *buf) +{ + bin2hex (register_data (regcache, n, 1), buf, + register_size (regcache->tdesc, n)); +} + +void +collect_register_by_name (struct regcache *regcache, + const char *name, void *buf) +{ + collect_register (regcache, find_regno (regcache->tdesc, name), buf); +} + +/* Special handling for register PC. */ + +CORE_ADDR +regcache_read_pc (struct regcache *regcache) +{ + CORE_ADDR pc_val; + + if (the_target->read_pc) + pc_val = the_target->read_pc (regcache); + else + internal_error (__FILE__, __LINE__, + "regcache_read_pc: Unable to find PC"); + + return pc_val; +} + +void +regcache_write_pc (struct regcache *regcache, CORE_ADDR pc) +{ + if (the_target->write_pc) + the_target->write_pc (regcache, pc); + else + internal_error (__FILE__, __LINE__, + "regcache_write_pc: Unable to update PC"); +} + +#endif + +/* See gdbsupport/common-regcache.h. */ + +enum register_status +regcache::get_register_status (int regnum) const +{ +#ifndef IN_PROCESS_AGENT + gdb_assert (regnum >= 0 && regnum < tdesc->reg_defs.size ()); + return (enum register_status) (register_status[regnum]); +#else + return REG_VALID; +#endif +} + +/* See gdbsupport/common-regcache.h. */ + +bool +regcache::raw_compare (int regnum, const void *buf, int offset) const +{ + gdb_assert (buf != NULL); + + const unsigned char *regbuf = register_data (this, regnum, 1); + int size = register_size (tdesc, regnum); + gdb_assert (size >= offset); + + return (memcmp (buf, regbuf + offset, size - offset) == 0); +} |