binutils-gdb/gdb/alpha-linux-tdep.c

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/* Target-dependent code for GNU/Linux on Alpha.
Copyright 2002 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
* Makefile.in (ALLDEPFILES): Add alpha-osf1-tdep.c. (alpha-osf1-tdep.o): New dependency list. * alpha-tdep.h (gdbarch_tdep): Add dynamic_sigtramp_offset and skip_sigtramp_frame members. * alpha-linux-tdep.c: Include gdbcore.h. (alpha_linux_sigtramp_offset): Change return type to LONGEST. (alpha_linux_init_abi): Initialize tdep->dynamic_sigtramp_offset. * alpha-osf1-tdep.c: New file. * alpha-tdep.c (alpha_osf_skip_sigtramp_frame): Moved to alpha-osf1-dep.c. (alpha_frame_past_sigtramp_frame): New function. (alpha_dynamic_sigtramp_offset): Ditto. (alpha_proc_desc_is_dyn_sigtramp): Ditto. (alpha_set_proc_desc_is_dyn_sigtramp): Ditto. (ALPHA_PROC_SIGTRAMP_MAGIC): Define. (push_sigtramp_desc): Use alpha_set_proc_desc_is_dyn_sigtramp. (after_prologue): Use alpha_proc_desc_is_dyn_sigtramp. (find_proc_desc): Use alpha_dynamic_sigtramp_offset. (alpha_frame_chain): Use alpha_frame_past_sigtramp_frame. (alpha_init_extra_frame_info): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_pop_frame): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_gdbarch_init): Initialize tdep->dynamic_sigtramp_offset and tdep->skip_sigtramp_frame. Set gdbarch_skip_trampoline_code to find_solib_trampoline_target. * config/alpha/alpha-osf1.mt (TDEPFILES): Add alpha-osf1-tdep.o. * config/alpha/tm-alpha.h: Remove inclusion of regcache.h. (SKIP_TRAMPOLINE_CODE): Remove. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto. * config/alpha/tm-alphalinux.h (PROC_DESC_IS_DYN_SIGTRAMP): Remove. (PROC_SIGTRAMP_MAGIC): Ditto. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto.
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#include "gdbcore.h"
#include "value.h"
#include "alpha-tdep.h"
/* Under GNU/Linux, signal handler invocations can be identified by the
designated code sequence that is used to return from a signal
handler. In particular, the return address of a signal handler
points to the following sequence (the first instruction is quadword
aligned):
bis $30,$30,$16
addq $31,0x67,$0
call_pal callsys
Each instruction has a unique encoding, so we simply attempt to
match the instruction the pc is pointing to with any of the above
instructions. If there is a hit, we know the offset to the start
of the designated sequence and can then check whether we really are
executing in a designated sequence. If not, -1 is returned,
otherwise the offset from the start of the desingated sequence is
returned.
There is a slight chance of false hits: code could jump into the
middle of the designated sequence, in which case there is no
guarantee that we are in the middle of a sigreturn syscall. Don't
think this will be a problem in praxis, though. */
* Makefile.in (ALLDEPFILES): Add alpha-osf1-tdep.c. (alpha-osf1-tdep.o): New dependency list. * alpha-tdep.h (gdbarch_tdep): Add dynamic_sigtramp_offset and skip_sigtramp_frame members. * alpha-linux-tdep.c: Include gdbcore.h. (alpha_linux_sigtramp_offset): Change return type to LONGEST. (alpha_linux_init_abi): Initialize tdep->dynamic_sigtramp_offset. * alpha-osf1-tdep.c: New file. * alpha-tdep.c (alpha_osf_skip_sigtramp_frame): Moved to alpha-osf1-dep.c. (alpha_frame_past_sigtramp_frame): New function. (alpha_dynamic_sigtramp_offset): Ditto. (alpha_proc_desc_is_dyn_sigtramp): Ditto. (alpha_set_proc_desc_is_dyn_sigtramp): Ditto. (ALPHA_PROC_SIGTRAMP_MAGIC): Define. (push_sigtramp_desc): Use alpha_set_proc_desc_is_dyn_sigtramp. (after_prologue): Use alpha_proc_desc_is_dyn_sigtramp. (find_proc_desc): Use alpha_dynamic_sigtramp_offset. (alpha_frame_chain): Use alpha_frame_past_sigtramp_frame. (alpha_init_extra_frame_info): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_pop_frame): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_gdbarch_init): Initialize tdep->dynamic_sigtramp_offset and tdep->skip_sigtramp_frame. Set gdbarch_skip_trampoline_code to find_solib_trampoline_target. * config/alpha/alpha-osf1.mt (TDEPFILES): Add alpha-osf1-tdep.o. * config/alpha/tm-alpha.h: Remove inclusion of regcache.h. (SKIP_TRAMPOLINE_CODE): Remove. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto. * config/alpha/tm-alphalinux.h (PROC_DESC_IS_DYN_SIGTRAMP): Remove. (PROC_SIGTRAMP_MAGIC): Ditto. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto.
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LONGEST
alpha_linux_sigtramp_offset (CORE_ADDR pc)
{
unsigned int i[3], w;
long off;
if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
return -1;
off = -1;
switch (w)
{
case 0x47de0410:
off = 0;
break; /* bis $30,$30,$16 */
case 0x43ecf400:
off = 4;
break; /* addq $31,0x67,$0 */
case 0x00000083:
off = 8;
break; /* call_pal callsys */
default:
return -1;
}
pc -= off;
if (pc & 0x7)
{
/* designated sequence is not quadword aligned */
return -1;
}
if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
return -1;
if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
return off;
return -1;
}
static int
alpha_linux_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
{
return (alpha_linux_sigtramp_offset (pc) >= 0);
}
static CORE_ADDR
alpha_linux_sigcontext_addr (struct frame_info *frame)
{
return (frame->frame - 0x298); /* sizeof(struct sigcontext) */
}
static void
alpha_linux_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
* Makefile.in (ALLDEPFILES): Add alpha-osf1-tdep.c. (alpha-osf1-tdep.o): New dependency list. * alpha-tdep.h (gdbarch_tdep): Add dynamic_sigtramp_offset and skip_sigtramp_frame members. * alpha-linux-tdep.c: Include gdbcore.h. (alpha_linux_sigtramp_offset): Change return type to LONGEST. (alpha_linux_init_abi): Initialize tdep->dynamic_sigtramp_offset. * alpha-osf1-tdep.c: New file. * alpha-tdep.c (alpha_osf_skip_sigtramp_frame): Moved to alpha-osf1-dep.c. (alpha_frame_past_sigtramp_frame): New function. (alpha_dynamic_sigtramp_offset): Ditto. (alpha_proc_desc_is_dyn_sigtramp): Ditto. (alpha_set_proc_desc_is_dyn_sigtramp): Ditto. (ALPHA_PROC_SIGTRAMP_MAGIC): Define. (push_sigtramp_desc): Use alpha_set_proc_desc_is_dyn_sigtramp. (after_prologue): Use alpha_proc_desc_is_dyn_sigtramp. (find_proc_desc): Use alpha_dynamic_sigtramp_offset. (alpha_frame_chain): Use alpha_frame_past_sigtramp_frame. (alpha_init_extra_frame_info): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_pop_frame): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_gdbarch_init): Initialize tdep->dynamic_sigtramp_offset and tdep->skip_sigtramp_frame. Set gdbarch_skip_trampoline_code to find_solib_trampoline_target. * config/alpha/alpha-osf1.mt (TDEPFILES): Add alpha-osf1-tdep.o. * config/alpha/tm-alpha.h: Remove inclusion of regcache.h. (SKIP_TRAMPOLINE_CODE): Remove. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto. * config/alpha/tm-alphalinux.h (PROC_DESC_IS_DYN_SIGTRAMP): Remove. (PROC_SIGTRAMP_MAGIC): Ditto. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto.
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
set_gdbarch_pc_in_sigtramp (gdbarch, alpha_linux_pc_in_sigtramp);
* Makefile.in (ALLDEPFILES): Add alpha-osf1-tdep.c. (alpha-osf1-tdep.o): New dependency list. * alpha-tdep.h (gdbarch_tdep): Add dynamic_sigtramp_offset and skip_sigtramp_frame members. * alpha-linux-tdep.c: Include gdbcore.h. (alpha_linux_sigtramp_offset): Change return type to LONGEST. (alpha_linux_init_abi): Initialize tdep->dynamic_sigtramp_offset. * alpha-osf1-tdep.c: New file. * alpha-tdep.c (alpha_osf_skip_sigtramp_frame): Moved to alpha-osf1-dep.c. (alpha_frame_past_sigtramp_frame): New function. (alpha_dynamic_sigtramp_offset): Ditto. (alpha_proc_desc_is_dyn_sigtramp): Ditto. (alpha_set_proc_desc_is_dyn_sigtramp): Ditto. (ALPHA_PROC_SIGTRAMP_MAGIC): Define. (push_sigtramp_desc): Use alpha_set_proc_desc_is_dyn_sigtramp. (after_prologue): Use alpha_proc_desc_is_dyn_sigtramp. (find_proc_desc): Use alpha_dynamic_sigtramp_offset. (alpha_frame_chain): Use alpha_frame_past_sigtramp_frame. (alpha_init_extra_frame_info): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_pop_frame): Use alpha_proc_desc_is_dyn_sigtramp. (alpha_gdbarch_init): Initialize tdep->dynamic_sigtramp_offset and tdep->skip_sigtramp_frame. Set gdbarch_skip_trampoline_code to find_solib_trampoline_target. * config/alpha/alpha-osf1.mt (TDEPFILES): Add alpha-osf1-tdep.o. * config/alpha/tm-alpha.h: Remove inclusion of regcache.h. (SKIP_TRAMPOLINE_CODE): Remove. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto. * config/alpha/tm-alphalinux.h (PROC_DESC_IS_DYN_SIGTRAMP): Remove. (PROC_SIGTRAMP_MAGIC): Ditto. (PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (SET_PROC_DESC_IS_DYN_SIGTRAMP): Ditto. (DYNAMIC_SIGTRAMP_OFFSET): Ditto. (FRAME_PAST_SIGTRAMP_FRAME): Ditto.
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tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
tdep->jb_pc = 2;
tdep->jb_elt_size = 8;
}
void
_initialize_alpha_linux_tdep (void)
{
* Makefile.in (SFILES): Add osabi.c. (COMMON_OBS): Add osabi.o. (osabi.o): New dependency list. * osabi.c: New file. * osabi.h: New file. * doc/gdbint.texinfo: Document new generic OS ABI framework. * Makefile.in (alpha_tdep_h): Define and use instead of alpha-tdep.h. * alpha-tdep.c (alpha_abi_names, process_note_abi_tag_sections, get_elfosabi, alpha_abi_handler_list, alpha_gdbarch_register_os_abi): Remove. (alpha_gdbarch_init, alpha_dump_tdep): Use generic OS ABI framework. * alpha-tdep.h: Include osabi.h. (alpha_abi): Remove. (gdbarch_tdep): Use generic OS ABI framework. * alpha-linux-tdep.c (_initialize_alpha_linux_tdep): Use gdbarch_register_osabi. * alpha-osf1-tdep.c (_initialize_alpha_osf1_tdep): Likewise. * alphafbsd-tdep.c (_initialize_alphafbsd_tdep): Likewise. * alphanbsd-tdep.c (_initialize_alphanbsd_tdep): Likewise. * Makefile.in (sh_tdep_h): Add osabi.h. * sh-tdep.h (sh_osabi): Remove. (gdbarch_tdep): Use generic OS ABI framework. * sh-tdep.c (sh_osabi_names, process_note_abi_tag_sections, sh_osabi_handler_list, sh_gdbarch_register_os_abi): Remove. (sh_gdbarch_init, sh_dump_tdep): Use generic OS ABI framework. * shnbsd-tdep.c (_initialize_shnbsd_tdep): Use gdbarch_register_osabi. * Makefile.in (arm_tdep_h): Define and use instead of arm-tdep.h. * arm-linux-tdep.c (_initialize_arm_linux_tdep): Use gdbarch_register_osabi. * arm-tdep.c (arm_abi_names, process_note_abi_tag_sections, arm_abi_handler_list, arm_gdbarch_register_os_abi): Remove. (get_elfosabi): Rename to... (arm_elf_osabi_sniffer): ...this. Adjust to use generic OS ABI framework support routines. (arm_gdbarch_init): Use generic OS ABI framework. (arm_dump_tdep): Likewise. (_initialize_arm_tdep): Likewise. * arm-tdep.h: Include osabi.h. (arm_abi): Remove. (gdbarch_tdep): Remove arm_abi and abi_name members. Add osabi member. (arm_gdbarch_register_os_abi): Remove prototype. * armnbsd-tdep.c (arm_netbsd_aout_osabi_sniffer): New function. (_initialize_arm_netbsd_tdep): Use gdbarch_register_osabi. * Makefile.in (mips-tdep.o): Add osabi.h to dependency list. * mips-tdep.c: Include osabi.h. (gdbarch_tdep, mips_gdbarch_init, mips_dump_tdep): Use generic OS ABI framework.
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gdbarch_register_osabi (bfd_arch_alpha, GDB_OSABI_LINUX,
alpha_linux_init_abi);
}