accc6d1ff3
* alpha-linux-tdep.c (alpha_linux_init_abi): Initialize tdep->jb_pc and tdep->jb_elt_size. * alpha-osf1-tdep.c (alpha_osf1_init_abi): Likewise. * alphafbsd-tdep.c (alphafbsd_init_abi): Likewise. * alphanbsd-tdep.c (alphanbsd_init_abi): Likewise. * alpha-nat.c (get_longjmp_target): Remove. (JB_ELEMENT_SIZE): Ditto. (JB_PC): Ditto. * alpha-tdep.c (alpha_get_longjmp_target): New function. (alpha_gdbarch_init): Default tdep->jb_pc to -1. If the OS ABI sets jb_pc to a valid value, set gdbarch_get_longjmp_target to alpha_get_longjmp_target. (alpha_dump_tdep): Report tdep->jb_pc and tdep->jb_elt_size. * config/alpha/nm-linux.h (GET_LONGJMP_TARGET): Remove. * config/alpha/nm-osf.h (GET_LONGJMP_TARGET): Remove.
158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/* Target-dependent code for NetBSD/Alpha.
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Copyright 2002 Free Software Foundation, Inc.
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Contributed by Wasabi Systems, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "value.h"
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#include "solib-svr4.h"
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#include "alpha-tdep.h"
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/* Fetch (and possibly build) an appropriate link_map_offsets
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structure for NetBSD/alpha targets using the struct offsets
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defined in <link.h> (but without actual reference to that file).
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This makes it possible to access NetBSD/alpha shared libraries
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from a GDB that was not built on a NetBSD/alpha host (for cross
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debugging). */
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static struct link_map_offsets *
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alphanbsd_solib_svr4_fetch_link_map_offsets (void)
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{
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static struct link_map_offsets lmo;
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static struct link_map_offsets *lmp = NULL;
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if (lmp == NULL)
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{
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lmp = &lmo;
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lmo.r_debug_size = 32;
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lmo.r_map_offset = 8;
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lmo.r_map_size = 8;
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lmo.link_map_size = 40;
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lmo.l_addr_offset = 0;
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lmo.l_addr_size = 8;
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lmo.l_name_offset = 8;
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lmo.l_name_size = 8;
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lmo.l_next_offset = 24;
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lmo.l_next_size = 8;
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lmo.l_prev_offset = 32;
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lmo.l_prev_size = 8;
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}
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return lmp;
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}
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/* Under NetBSD/alpha, signal handler invocations can be identified by the
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designated code sequence that is used to return from a signal handler.
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In particular, the return address of a signal handler points to the
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following code sequence:
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ldq a0, 0(sp)
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lda sp, 16(sp)
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lda v0, 295(zero) # __sigreturn14
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call_pal callsys
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Each instruction has a unique encoding, so we simply attempt to match
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the instruction the PC is pointing to with any of the above instructions.
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If there is a hit, we know the offset to the start of the designated
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sequence and can then check whether we really are executing in the
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signal trampoline. If not, -1 is returned, otherwise the offset from the
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start of the return sequence is returned. */
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static const unsigned int sigtramp_retcode[] =
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{
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0xa61e0000, /* ldq a0, 0(sp) */
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0x23de0010, /* lda sp, 16(sp) */
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0x201f0127, /* lda v0, 295(zero) */
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0x00000083, /* call_pal callsys */
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};
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#define RETCODE_NWORDS \
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(sizeof (sigtramp_retcode) / sizeof (sigtramp_retcode[0]))
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LONGEST
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alphanbsd_sigtramp_offset (CORE_ADDR pc)
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{
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unsigned int ret[4], w;
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LONGEST off;
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int i;
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if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
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return -1;
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for (i = 0; i < RETCODE_NWORDS; i++)
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{
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if (w == sigtramp_retcode[i])
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break;
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}
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if (i == RETCODE_NWORDS)
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return (-1);
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off = i * 4;
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pc -= off;
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if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
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return -1;
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if (memcmp (ret, sigtramp_retcode, sizeof (sigtramp_retcode)) == 0)
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return off;
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return -1;
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}
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static int
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alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
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{
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return (alphanbsd_sigtramp_offset (pc) >= 0);
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}
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static void
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alphanbsd_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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set_gdbarch_pc_in_sigtramp (gdbarch, alphanbsd_pc_in_sigtramp);
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/* NetBSD/alpha does not provide single step support via ptrace(2); we
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must use software single-stepping. */
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set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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alphanbsd_solib_svr4_fetch_link_map_offsets);
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tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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}
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void
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_initialize_alphanbsd_tdep (void)
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{
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alpha_gdbarch_register_os_abi (ALPHA_ABI_NETBSD, alphanbsd_init_abi);
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}
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