[rfc] Support 32-bit applications using 64-bit register set on s390-linux
Ulrich Weigand
uweigand@de.ibm.com
Mon Jan 4 15:09:00 GMT 2010
> ChangeLog:
>
> * features/Makefile (WHICH): Add s390-linux32, s390-linux64,
> and s390x-linux64.
> (s390-linux32-expedite): Define.
> (s390-linux64-expedite): Define.
> (s390x-linux64-expedite): Define.
> * features/s390-acr.xml: New file.
> * features/s390-fpr.xml: New file.
> * features/s390-core32.xml: New file.
> * features/s390-core64.xml: New file.
> * features/s390x-core64.xml: New file.
> * features/s390-linux32.xml: New file.
> * features/s390-linux64.xml: New file.
> * features/s390x-linux64.xml: New file.
> * features/s390-linux32.c: New generated file.
> * features/s390-linux64.c: New generated file.
> * features/s390x-linux64.c: New generated file.
>
> * regformats/s390-linux32.dat: New generated file.
> * regformats/s390-linux64.dat: New generated file.
> * regformats/s390x-linux64.dat: New generated file.
> * regformats/reg-s390.dat: Remove.
> * regformats/reg-s390x.dat: Remove.
>
> * s390-nat.c: Include "auxv.h" and <elf.h>.
> (HWCAP_S390_HIGH_GPRS): Define if undefined.
> (s390_target_wordsize): New function.
> (s390_auxv_parse): Likewise.
> (s390_get_hwcap): Likewise.
> (s390_read_description): Likewise.
> (_initialize_s390_nat): Install s390_auxv_parse and
> s390_read_description.
>
> * s390-tdep.c: Include "features/s390-linux32.c",
> "features/s390-linux64.c", and "features/s390x-linux64.c".
> (struct gdbarch_tdep): Add gpr_full_regnum, pc_regnum, and cc_regnum.
> (s390_register_call_saved): New function.
> (s390_register_name): Remove.
> (s390_register_type): Remove.
> (s390_dwarf_regmap): Add lower half GPR pseudo DWARF CFI regnums.
> (s390_dwarf_reg_to_regnum): Remap GPR regnums to full GPRs.
> (s390_adjust_frame_regnum): Remap GPR regnums to lower halves for CFI.
> (s390_pseudo_register_name): New function.
> (s390_pseudo_register_type): New function.
> (s390_pseudo_register_read): Handle both 32-bit and 64-bit cases.
> Handle full GPR pesudos and varying pseudo register numbers.
> (s390_pseudo_register_write): Likewise
> (s390x_pseudo_register_read): Remove.
> (s390x_pseudo_register_write): Likewise.
> (s390_register_group): Remove.
> (s390_pseudo_register_group): New function.
> (s390_regmap_gregset): Add GPR upper halves.
> (s390x_regmap_gregset): Likewise.
> (s390_regmap_fpregset): Likewise.
> (s390_regmap_upper): New global variable.
> (s390_upper_regset): New global variable.
> (s390_upper_regset_sections): New global variable.
> (s390_regset_from_core_section): Handle GPR upper halves.
> (s390_core_read_description): New function.
> (s390_prologue_frame_unwind_cache): Set up ABI call-saved/clobbered
> register information. Handle varying pseudo register numbers.
> (s390_backchain_frame_unwind_cache): Likewise.
> (s390_frame_prev_register): Unwind full GPRs to show lower halves.
> (s390_stub_frame_unwind_cache): Handle varying pseudo register numbers.
> (s390_sigtramp_frame_unwind_cache): Unwind PSWM and PSWA as well as
> PC and CC pseudos. Unwind upper halves and full GPRs as appropriate.
> Handle varying pseudo register numbers.
> (s390_unwind_pc): Handle varying pseudo register numbers.
> (s390_dwarf2_prev_register): New function.
> (s390_dwarf2_frame_init_reg): Set up ABI call-saved/clobbered
> register information. Handle varying pseudo register numbers.
> Install s390_dwarf2_prev_register to unwind full GPRs.
> (s390_gdbarch_init): Handle target descriptions. Assign varying
> pseudo register numbers. Install s390_adjust_frame_regnum.
> (_initialize_s390_tdep): Initialize target descriptions.
>
> * s390-tdep.h (S390_R0_UPPER_REGNUM .. S390_R15_UPPER_REGNUM): Define.
> (S390_NUM_REGS): Redefine to include upper half registers.
> (S390_PC_REGNUM, S390_CC_REGNUM): Remove.
> (S390_NUM_PSEUDO_REGS, S390_NUM_TOTAL_REGS): Likewise.
> (tdesc_s390_linux32): Add declaration.
> (tdesc_s390_linux64): Likewise.
> (tdesc_s390x_linux64): Likewise.
>
> gdb/testsuite/
> * gdb.xml/tdesc-regs.exp: Support s390*-*-* targets.
>
> gdbserver/
> * Makefile.in (clean): Remove new generated files.
> (reg-s390.o, reg-s390.c): Remove rules.
> (reg-s390x.o, reg-s390x.c): Likewise.
> (s390-linux32.o, s390-linux32.c): Add rules.
> (s390-linux64.o, s390-linux64.c): Likewise.
> (s390x-linux64.o, s390x-linux64.c): Likewise.
> * configure.srv (s390*-*-linux*): Update srv_regobj and srv_xmlfiles.
> * linux-s390-low.c: Include <elf.h>.
> (HWCAP_S390_HIGH_GPRS): Define if undefined.
> (init_registers_s390): Remove prototype.
> (init_registers_s390x): Likewise.
> (init_registers_s390_linux32): Add prototype.
> (init_registers_s390_linux64): Likewise.
> (init_registers_s390x_linux64): Likewise.
> (s390_num_regs_3264): New define.
> (s390_regmap_3264): New global variable.
> (s390_cannot_fetch_register): Remove obsolete check.
> (s390_cannot_store_register): Likewise.
> (s390_collect_ptrace_register): Handle upper/lower register halves.
> (s390_supply_ptrace_register): Likewise.
> (s390_fill_gregset): Update to register number changes.
> (s390_get_hwcap): New routine.
> (s390_arch_setup): Detect 32-bit process running on 64-bit system.
> Install appropriate regmap and register set.
And finally I've checked this in as well.
Bye,
Ulrich
--
Dr. Ulrich Weigand
GNU Toolchain for Linux on System z and Cell BE
Ulrich.Weigand@de.ibm.com
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