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pseudo registers are either from raw registers or memory, so gdbarch methods pseudo_register_read and pseudo_register_read_value should have regcache object which only have read methods. In other words, we should disallow writing to regcache in these two gdbarch methods. In order to apply this restriction, this patch adds a new class readable_regcache, derived from reg_buffer, and it only has raw_read and cooked_read methods. regcache is derived from readable_regcache. This patch also passes readable_regcache instead of regcache to gdbarch methods pseudo_register_read and pseudo_register_read_value. This patch moves raw_read* and cooked_read* methods to readable_regcache, which is straightforward. One thing not straightforward is that I split regcache::xfer_part to readable_regcache::read_part and regcache::write_part, because readable_regcache can only have methods to read. readable_regcache is an abstract base class, and it has a pure virtual function raw_update, because I don't want readable_regcache know where these raw registers are from. They can be from either the target (readwrite regcache) or the regcache itself (readonly regcache). gdb: 2018-02-21 Yao Qi <yao.qi@linaro.org> * aarch64-tdep.c (aarch64_pseudo_register_read_value): Change parameter type to 'readable_regcache *'. * amd64-tdep.c (amd64_pseudo_register_read_value): Likewise. * arm-tdep.c (arm_neon_quad_read): Likewise. (arm_pseudo_read): Likewise. * avr-tdep.c (avr_pseudo_register_read): Likewise. * bfin-tdep.c (bfin_pseudo_register_read): Likewise. * frv-tdep.c (frv_pseudo_register_read): Likewise. * gdbarch.c: Re-generated. * gdbarch.h: Re-generated. * gdbarch.sh (pseudo_register_read): Change parameter type to 'readable_regcache *'. (pseudo_register_read_value): Likewise. * h8300-tdep.c (pseudo_from_raw_register): Likewise. (h8300_pseudo_register_read): Likewise. * hppa-tdep.c (hppa_pseudo_register_read): Likewise. * i386-tdep.c (i386_mmx_regnum_to_fp_regnum): Likewise. (i386_pseudo_register_read_into_value): Likewise. (i386_pseudo_register_read_value): Likewise. * i386-tdep.h (i386_pseudo_register_read_into_value): Update declaration. * ia64-tdep.c (ia64_pseudo_register_read): Likewise. * m32c-tdep.c (m32c_raw_read): Likewise. (m32c_read_flg): Likewise. (m32c_banked_register): Likewise. (m32c_banked_read): Likewise. (m32c_sb_read): Likewise. (m32c_part_read): Likewise. (m32c_cat_read): Likewise. (m32c_r3r2r1r0_read): Likewise. (m32c_pseudo_register_read): Likewise. * m68hc11-tdep.c (m68hc11_pseudo_register_read): Likewise. * mep-tdep.c (mep_pseudo_cr32_read): Likewise. (mep_pseudo_cr64_read): Likewise. (mep_pseudo_register_read): Likewise. * mips-tdep.c (mips_pseudo_register_read): Likewise. * msp430-tdep.c (msp430_pseudo_register_read): Likewise. * nds32-tdep.c (nds32_pseudo_register_read): Likewise. * regcache.c (regcache::raw_read): Move it to readable_regcache. (regcache::cooked_read): Likewise. (regcache::cooked_read_value): Likewise. (regcache_cooked_read_signed): (regcache::cooked_read): Likewise. * regcache.h (readable_regcache): New class. (regcache): Inherit readable_regcache. Move some methods to readable_regcache. * rl78-tdep.c (rl78_pseudo_register_read): Change parameter type to 'readable_regcache *'. * rs6000-tdep.c (do_regcache_raw_read): Remove. (e500_pseudo_register_read): Change parameter type to 'readable_regcache *'. (dfp_pseudo_register_read): Likewise. (vsx_pseudo_register_read): Likewise. (efpr_pseudo_register_read): Likewise. * s390-tdep.c (s390_pseudo_register_read): Likewise. * sh-tdep.c (sh_pseudo_register_read): Likewise. * sh64-tdep.c (pseudo_register_read_portions): Likewise. (sh64_pseudo_register_read): Likewise. * sparc-tdep.c (sparc32_pseudo_register_read): Likewise. * sparc64-tdep.c (sparc64_pseudo_register_read): Likewise. * spu-tdep.c (spu_pseudo_register_read_spu): Likewise. (spu_pseudo_register_read): Likewise. * xtensa-tdep.c (xtensa_register_read_masked): Likewise. (xtensa_pseudo_register_read): Likewise.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.