204 lines
6.4 KiB
C
204 lines
6.4 KiB
C
/* Target-dependent code for Solaris SPARC.
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Copyright 2003, 2004 Free Software Foundation, 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 "frame.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "sparc-tdep.h"
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#include "solib-svr4.h"
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/* From <sys/regset.h>. */
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const struct sparc_gregset sparc32_sol2_gregset =
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{
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32 * 4, /* %psr */
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33 * 4, /* %pc */
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34 * 4, /* %npc */
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35 * 4, /* %y */
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36 * 4, /* %wim */
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37 * 4, /* %tbr */
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1 * 4, /* %g1 */
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16 * 4, /* %l0 */
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};
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/* The Solaris signal trampolines reside in libc. For normal signals,
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the function `sigacthandler' is used. This signal trampoline will
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call the signal handler using the System V calling convention,
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where the third argument is a pointer to an instance of
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`ucontext_t', which has a member `uc_mcontext' that contains the
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saved registers. Incidentally, the kernel passes the `ucontext_t'
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pointer as the third argument of the signal trampoline too, and
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`sigacthandler' simply passes it on. However, if you link your
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program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function
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`ucbsigvechandler' will be used, which invokes the using the BSD
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convention, where the third argument is a pointer to an instance of
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`struct sigcontext'. It is the `ucbsigvechandler' function that
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converts the `ucontext_t' to a `sigcontext', and back. Unless the
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signal handler modifies the `struct sigcontext' we can safely
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ignore this. */
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int
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sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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return (name && (strcmp (name, "sigacthandler") == 0
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|| strcmp (name, "ucbsigvechandler") == 0
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|| strcmp (name, "__sighndlr") == 0));
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}
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static struct sparc_frame_cache *
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sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame,
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void **this_cache)
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{
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struct sparc_frame_cache *cache;
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CORE_ADDR mcontext_addr, addr;
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int regnum;
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if (*this_cache)
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return *this_cache;
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cache = sparc_frame_cache (next_frame, this_cache);
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gdb_assert (cache == *this_cache);
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cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
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/* The third argument is a pointer to an instance of `ucontext_t',
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which has a member `uc_mcontext' that contains the saved
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registers. */
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regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
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mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40;
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cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4;
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cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4;
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cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4;
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cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4;
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/* Since %g0 is always zero, keep the identity encoding. */
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for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;
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regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)
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cache->saved_regs[regnum].addr = addr;
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if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4))
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{
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/* The register windows haven't been flushed. */
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for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
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trad_frame_set_unknown (cache->saved_regs, regnum);
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}
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else
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{
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addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
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addr = get_frame_memory_unsigned (next_frame, addr, 4);
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for (regnum = SPARC_L0_REGNUM;
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regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
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cache->saved_regs[regnum].addr = addr;
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}
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return cache;
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}
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static void
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sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct sparc_frame_cache *cache =
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sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static void
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sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp,
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CORE_ADDR *addrp,
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int *realnump, gdb_byte *valuep)
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{
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struct sparc_frame_cache *cache =
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sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
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trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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}
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static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind =
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{
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SIGTRAMP_FRAME,
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sparc32_sol2_sigtramp_frame_this_id,
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sparc32_sol2_sigtramp_frame_prev_register
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};
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static const struct frame_unwind *
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sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (sparc_sol2_pc_in_sigtramp (pc, name))
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return &sparc32_sol2_sigtramp_frame_unwind;
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return NULL;
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}
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void
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sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Solaris has SVR4-style shared libraries... */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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/* ...which means that we need some special handling when doing
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prologue analysis. */
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tdep->plt_entry_size = 12;
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/* Solaris has kernel-assisted single-stepping support. */
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set_gdbarch_software_single_step (gdbarch, NULL);
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frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_sparc_sol2_tdep (void);
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void
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_initialize_sparc_sol2_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_sparc, 0,
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GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);
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}
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