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s390: Hook s390 into OSABI mechanism 

Do what the title says and distinguish between 31- and 64-bit systems.
The goal is to init the OSABI as late as possible in gdbarch_init so the
OSABI has the chance to overwrite the defaults.

There are two pitfalls to be aware of:

First, the dwarf2 unwinder must be appended before the OSABI is
initialized.  Otherwise the OS could add a default unwinder which always
takes control before the dwarf unwinder even gets a chance.

Second, tdesc_use_registers has to be handled with extra care.  It sets
several gdbarch hooks, especially gdbarch_register_name, which has to be
overwritten again after the call.  Furthermore it deletes the tdesc_data
without checking.  Therefore there must not be a call to
tdesc_data_cleanup afterwards or GDB will crash with a double free.

gdb/ChangeLog:

	* s390-linux-tdep.c (osabi.h): New include.
	(s390_linux_init_abi_31, s390_linux_init_abi_64)
	(s390_linux_init_abi_any): New functions.
	(s390_gdbarch_init, _initialize_s390_tdep): Adjust.
This commit is contained in:
Philipp Rudo 2018-01-23 13:37:43 +01:00 committed by Andreas Arnez
parent 650f5e1370
commit 7042632bf7
2 changed files with 165 additions and 131 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2018-01-23 Philipp Rudo <prudo@linux.vnet.ibm.com>
* s390-linux-tdep.c (osabi.h): New include.
(s390_linux_init_abi_31, s390_linux_init_abi_64)
(s390_linux_init_abi_any): New functions.
(s390_gdbarch_init, _initialize_s390_tdep): Adjust.
2018-01-23 Philipp Rudo <prudo@linux.vnet.ibm.com>
* s390-linux-tdep.c (s390_gdbarch_init): Use gdb_assert for

289
gdb/s390-linux-tdep.c
View File

@ -30,6 +30,7 @@
#include "gdbcore.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "osabi.h"
#include "regcache.h"
#include "trad-frame.h"
#include "frame-base.h"
@ -8017,32 +8018,107 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
struct tdesc_arch_data *tdesc_data = tdesc_data_alloc ();
info.tdesc_data = tdesc_data;
/* Default ABI and register size. */
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
set_gdbarch_char_signed (gdbarch, 0);
/* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
We can safely let them default to 128-bit, since the debug info
will give the size of type actually used in each case. */
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
/* Amount PC must be decremented by after a breakpoint. This is
often the number of bytes returned by gdbarch_breakpoint_from_pc but not
always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_breakpoint_kind_from_pc (gdbarch, s390_breakpoint::kind_from_pc);
set_gdbarch_sw_breakpoint_from_kind (gdbarch, s390_breakpoint::bp_from_kind);
set_gdbarch_software_single_step (gdbarch, s390_software_single_step);
set_gdbarch_displaced_step_hw_singlestep (gdbarch, s390_displaced_step_hw_singlestep);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
set_gdbarch_stack_frame_destroyed_p (gdbarch, s390_stack_frame_destroyed_p);
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
set_gdbarch_guess_tracepoint_registers (gdbarch, s390_guess_tracepoint_registers);
set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
set_tdesc_pseudo_register_reggroup_p (gdbarch,
s390_pseudo_register_reggroup_p);
set_gdbarch_ax_pseudo_register_collect (gdbarch,
s390_ax_pseudo_register_collect);
set_gdbarch_ax_pseudo_register_push_stack
(gdbarch, s390_ax_pseudo_register_push_stack);
set_gdbarch_gen_return_address (gdbarch, s390_gen_return_address);
/* Inferior function calls. */
set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
set_gdbarch_frame_align (gdbarch, s390_frame_align);
set_gdbarch_return_value (gdbarch, s390_return_value);
/* Frame handling. */
dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
dwarf2_append_unwinders (gdbarch);
set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
/* Displaced stepping. */
set_gdbarch_displaced_step_copy_insn (gdbarch,
s390_displaced_step_copy_insn);
set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
set_gdbarch_displaced_step_location (gdbarch, linux_displaced_step_location);
set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
switch (info.bfd_arch_info->mach)
{
case bfd_mach_s390_31:
tdep->abi = ABI_LINUX_S390;
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
break;
case bfd_mach_s390_64:
tdep->abi = ABI_LINUX_ZSERIES;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
set_gdbarch_address_class_type_flags (gdbarch,
s390_address_class_type_flags);
set_gdbarch_address_class_type_flags_to_name (gdbarch,
s390_address_class_type_flags_to_name);
set_gdbarch_address_class_name_to_type_flags (gdbarch,
s390_address_class_name_to_type_flags);
break;
default:
xfree (tdep);
gdbarch_free (gdbarch);
return NULL;
}
/* Use default target description if none provided by the target. */
if (!tdesc_has_registers (tdesc))
{
if (tdep->abi == ABI_LINUX_S390)
tdesc = tdesc_s390_linux32;
else
tdesc = tdesc_s390x_linux64;
}
tdep->tdesc = tdesc;
/* SystemTap functions. */
set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
set_gdbarch_stap_register_indirection_prefixes (gdbarch,
stap_register_indirection_prefixes);
set_gdbarch_stap_register_indirection_suffixes (gdbarch,
stap_register_indirection_suffixes);
set_gdbarch_disassembler_options (gdbarch, &s390_disassembler_options);
set_gdbarch_valid_disassembler_options (gdbarch,
disassembler_options_s390 ());
/* Process record-replay */
set_gdbarch_process_record (gdbarch, s390_process_record);
/* Miscellaneous. */
set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
set_gdbarch_gcc_target_options (gdbarch, s390_gcc_target_options);
set_gdbarch_gnu_triplet_regexp (gdbarch, s390_gnu_triplet_regexp);
/* Initialize the OSABI. */
gdbarch_init_osabi (info, gdbarch);
/* Check any target description for validity. */
gdb_assert (tdesc_has_registers (tdep->tdesc));
@ -8085,51 +8161,6 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
return arches->gdbarch;
}
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
set_gdbarch_char_signed (gdbarch, 0);
/* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
We can safely let them default to 128-bit, since the debug info
will give the size of type actually used in each case. */
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
/* Amount PC must be decremented by after a breakpoint. This is
often the number of bytes returned by gdbarch_breakpoint_from_pc but not
always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_breakpoint_kind_from_pc (gdbarch, s390_breakpoint::kind_from_pc);
set_gdbarch_sw_breakpoint_from_kind (gdbarch, s390_breakpoint::bp_from_kind);
set_gdbarch_software_single_step (gdbarch, s390_software_single_step);
set_gdbarch_displaced_step_hw_singlestep (gdbarch, s390_displaced_step_hw_singlestep);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
set_gdbarch_stack_frame_destroyed_p (gdbarch, s390_stack_frame_destroyed_p);
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
set_gdbarch_iterate_over_regset_sections (gdbarch,
s390_iterate_over_regset_sections);
set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
set_gdbarch_write_pc (gdbarch, s390_write_pc);
set_gdbarch_guess_tracepoint_registers (gdbarch, s390_guess_tracepoint_registers);
set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
set_tdesc_pseudo_register_reggroup_p (gdbarch,
s390_pseudo_register_reggroup_p);
set_gdbarch_ax_pseudo_register_collect (gdbarch,
s390_ax_pseudo_register_collect);
set_gdbarch_ax_pseudo_register_push_stack
(gdbarch, s390_ax_pseudo_register_push_stack);
set_gdbarch_gen_return_address (gdbarch, s390_gen_return_address);
tdesc_use_registers (gdbarch, tdep->tdesc, tdesc_data);
set_gdbarch_register_name (gdbarch, s390_register_name);
@ -8151,93 +8182,83 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
/* Inferior function calls. */
set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
set_gdbarch_frame_align (gdbarch, s390_frame_align);
set_gdbarch_return_value (gdbarch, s390_return_value);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
frame_base_set_default (gdbarch, &s390_frame_base);
return gdbarch;
}
/* Initialize OSABI common for GNU/Linux on 31- and 64-bit systems. */
static void
s390_linux_init_abi_any (struct gdbarch_info info, struct gdbarch *gdbarch)
{
linux_init_abi (info, gdbarch);
/* Register handling. */
set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
set_gdbarch_iterate_over_regset_sections (gdbarch,
s390_iterate_over_regset_sections);
set_gdbarch_write_pc (gdbarch, s390_write_pc);
set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
/* Syscall handling. */
set_gdbarch_get_syscall_number (gdbarch, s390_linux_get_syscall_number);
/* Frame handling. */
dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
dwarf2_append_unwinders (gdbarch);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
frame_base_set_default (gdbarch, &s390_frame_base);
set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
/* Displaced stepping. */
set_gdbarch_displaced_step_copy_insn (gdbarch,
s390_displaced_step_copy_insn);
set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
set_gdbarch_displaced_step_location (gdbarch, linux_displaced_step_location);
set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
/* Note that GNU/Linux is the only OS supported on this
platform. */
linux_init_abi (info, gdbarch);
switch (tdep->abi)
{
case ABI_LINUX_S390:
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390);
break;
case ABI_LINUX_ZSERIES:
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
set_gdbarch_address_class_type_flags (gdbarch,
s390_address_class_type_flags);
set_gdbarch_address_class_type_flags_to_name (gdbarch,
s390_address_class_type_flags_to_name);
set_gdbarch_address_class_name_to_type_flags (gdbarch,
s390_address_class_name_to_type_flags);
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390X);
break;
}
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* SystemTap functions. */
set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
set_gdbarch_stap_register_indirection_prefixes (gdbarch,
stap_register_indirection_prefixes);
set_gdbarch_stap_register_indirection_suffixes (gdbarch,
stap_register_indirection_suffixes);
set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
set_gdbarch_gcc_target_options (gdbarch, s390_gcc_target_options);
set_gdbarch_gnu_triplet_regexp (gdbarch, s390_gnu_triplet_regexp);
/* Support reverse debugging. */
set_gdbarch_process_record (gdbarch, s390_process_record);
set_gdbarch_process_record_signal (gdbarch, s390_linux_record_signal);
s390_init_linux_record_tdep (&s390_linux_record_tdep, ABI_LINUX_S390);
s390_init_linux_record_tdep (&s390x_linux_record_tdep, ABI_LINUX_ZSERIES);
}
set_gdbarch_disassembler_options (gdbarch, &s390_disassembler_options);
set_gdbarch_valid_disassembler_options (gdbarch,
disassembler_options_s390 ());
/* Initialize OSABI for GNU/Linux on 31-bit systems. */
return gdbarch;
static void
s390_linux_init_abi_31 (struct gdbarch_info info, struct gdbarch *gdbarch)
{
const struct target_desc *tdesc = info.target_desc;
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->abi = ABI_LINUX_S390;
if (!tdesc_has_registers (tdesc))
tdesc = tdesc_s390_linux32;
tdep->tdesc = tdesc;
s390_linux_init_abi_any (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_ilp32_fetch_link_map_offsets);
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390);
}
/* Initialize OSABI for GNU/Linux on 64-bit systems. */
static void
s390_linux_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
{
const struct target_desc *tdesc = info.target_desc;
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->abi = ABI_LINUX_ZSERIES;
if (!tdesc_has_registers (tdesc))
tdesc = tdesc_s390x_linux64;
tdep->tdesc = tdesc;
s390_linux_init_abi_any (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_lp64_fetch_link_map_offsets);
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390X);
}
void
@ -8246,6 +8267,12 @@ _initialize_s390_tdep (void)
/* Hook us into the gdbarch mechanism. */
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
/* Hook us into the OSABI mechanism. */
gdbarch_register_osabi (bfd_arch_s390, bfd_mach_s390_31, GDB_OSABI_LINUX,
s390_linux_init_abi_31);
gdbarch_register_osabi (bfd_arch_s390, bfd_mach_s390_64, GDB_OSABI_LINUX,
s390_linux_init_abi_64);
/* Initialize the GNU/Linux target descriptions. */
initialize_tdesc_s390_linux32 ();
initialize_tdesc_s390_linux32v1 ();