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