1/* Target-dependent code for Solaris SPARC. 2 3 Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20#include "defs.h" 21#include "frame.h" 22#include "frame-unwind.h" 23#include "gdbcore.h" 24#include "symtab.h" 25#include "objfiles.h" 26#include "osabi.h" 27#include "regcache.h" 28#include "target.h" 29#include "trad-frame.h" 30 31#include "gdb_assert.h" 32#include "gdb_string.h" 33 34#include "sol2-tdep.h" 35#include "sparc-tdep.h" 36#include "solib-svr4.h" 37 38/* From <sys/regset.h>. */ 39const struct sparc_gregset sparc32_sol2_gregset = 40{ 41 32 * 4, /* %psr */ 42 33 * 4, /* %pc */ 43 34 * 4, /* %npc */ 44 35 * 4, /* %y */ 45 36 * 4, /* %wim */ 46 37 * 4, /* %tbr */ 47 1 * 4, /* %g1 */ 48 16 * 4, /* %l0 */ 49}; 50 51 52/* The Solaris signal trampolines reside in libc. For normal signals, 53 the function `sigacthandler' is used. This signal trampoline will 54 call the signal handler using the System V calling convention, 55 where the third argument is a pointer to an instance of 56 `ucontext_t', which has a member `uc_mcontext' that contains the 57 saved registers. Incidentally, the kernel passes the `ucontext_t' 58 pointer as the third argument of the signal trampoline too, and 59 `sigacthandler' simply passes it on. However, if you link your 60 program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function 61 `ucbsigvechandler' will be used, which invokes the using the BSD 62 convention, where the third argument is a pointer to an instance of 63 `struct sigcontext'. It is the `ucbsigvechandler' function that 64 converts the `ucontext_t' to a `sigcontext', and back. Unless the 65 signal handler modifies the `struct sigcontext' we can safely 66 ignore this. */ 67 68int 69sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name) 70{ 71 return (name && (strcmp (name, "sigacthandler") == 0 72 || strcmp (name, "ucbsigvechandler") == 0 73 || strcmp (name, "__sighndlr") == 0)); 74} 75 76static struct sparc_frame_cache * 77sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame, 78 void **this_cache) 79{ 80 struct sparc_frame_cache *cache; 81 CORE_ADDR mcontext_addr, addr; 82 int regnum; 83 84 if (*this_cache) 85 return *this_cache; 86 87 cache = sparc_frame_cache (next_frame, this_cache); 88 gdb_assert (cache == *this_cache); 89 90 cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); 91 92 /* The third argument is a pointer to an instance of `ucontext_t', 93 which has a member `uc_mcontext' that contains the saved 94 registers. */ 95 regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM); 96 mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40; 97 98 cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4; 99 cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4; 100 cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4; 101 cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4; 102 103 /* Since %g0 is always zero, keep the identity encoding. */ 104 for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4; 105 regnum <= SPARC_O7_REGNUM; regnum++, addr += 4) 106 cache->saved_regs[regnum].addr = addr; 107 108 if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4)) 109 { 110 /* The register windows haven't been flushed. */ 111 for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) 112 trad_frame_set_unknown (cache->saved_regs, regnum); 113 } 114 else 115 { 116 addr = cache->saved_regs[SPARC_SP_REGNUM].addr; 117 addr = get_frame_memory_unsigned (next_frame, addr, 4); 118 for (regnum = SPARC_L0_REGNUM; 119 regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) 120 cache->saved_regs[regnum].addr = addr; 121 } 122 123 return cache; 124} 125 126static void 127sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame, 128 void **this_cache, 129 struct frame_id *this_id) 130{ 131 struct sparc_frame_cache *cache = 132 sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache); 133 134 (*this_id) = frame_id_build (cache->base, cache->pc); 135} 136 137static void 138sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame, 139 void **this_cache, 140 int regnum, int *optimizedp, 141 enum lval_type *lvalp, 142 CORE_ADDR *addrp, 143 int *realnump, gdb_byte *valuep) 144{ 145 struct sparc_frame_cache *cache = 146 sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache); 147 148 trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum, 149 optimizedp, lvalp, addrp, realnump, valuep); 150} 151 152static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind = 153{ 154 SIGTRAMP_FRAME, 155 sparc32_sol2_sigtramp_frame_this_id, 156 sparc32_sol2_sigtramp_frame_prev_register 157}; 158 159static const struct frame_unwind * 160sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame) 161{ 162 CORE_ADDR pc = frame_pc_unwind (next_frame); 163 char *name; 164 165 find_pc_partial_function (pc, &name, NULL, NULL); 166 if (sparc_sol2_pc_in_sigtramp (pc, name)) 167 return &sparc32_sol2_sigtramp_frame_unwind; 168 169 return NULL; 170} 171 172 173void 174sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 175{ 176 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 177 178 /* Solaris has SVR4-style shared libraries... */ 179 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 180 set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver); 181 set_solib_svr4_fetch_link_map_offsets 182 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 183 184 /* ...which means that we need some special handling when doing 185 prologue analysis. */ 186 tdep->plt_entry_size = 12; 187 188 /* Solaris has kernel-assisted single-stepping support. */ 189 set_gdbarch_software_single_step (gdbarch, NULL); 190 191 frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer); 192} 193 194 195/* Provide a prototype to silence -Wmissing-prototypes. */ 196void _initialize_sparc_sol2_tdep (void); 197 198void 199_initialize_sparc_sol2_tdep (void) 200{ 201 gdbarch_register_osabi (bfd_arch_sparc, 0, 202 GDB_OSABI_SOLARIS, sparc32_sol2_init_abi); 203} 204