1/* Target-dependent code for GNU/Linux UltraSPARC. 2 3 Copyright (C) 2003, 2004, 2005, 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 "dwarf2-frame.h" 24#include "regset.h" 25#include "regcache.h" 26#include "gdbarch.h" 27#include "gdbcore.h" 28#include "osabi.h" 29#include "solib-svr4.h" 30#include "symtab.h" 31#include "trad-frame.h" 32#include "tramp-frame.h" 33 34#include "sparc64-tdep.h" 35 36/* Signal trampoline support. */ 37 38static void sparc64_linux_sigframe_init (const struct tramp_frame *self, 39 struct frame_info *next_frame, 40 struct trad_frame_cache *this_cache, 41 CORE_ADDR func); 42 43/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only 44 use RT signals. */ 45 46static const struct tramp_frame sparc64_linux_rt_sigframe = 47{ 48 SIGTRAMP_FRAME, 49 4, 50 { 51 { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ 52 { 0x91d0206d, -1 }, /* ta 0x6d */ 53 { TRAMP_SENTINEL_INSN, -1 } 54 }, 55 sparc64_linux_sigframe_init 56}; 57 58static void 59sparc64_linux_sigframe_init (const struct tramp_frame *self, 60 struct frame_info *next_frame, 61 struct trad_frame_cache *this_cache, 62 CORE_ADDR func) 63{ 64 CORE_ADDR base, addr, sp_addr; 65 int regnum; 66 67 base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM); 68 base += 128; 69 70 /* Offsets from <bits/sigcontext.h>. */ 71 72 /* Since %g0 is always zero, keep the identity encoding. */ 73 addr = base + 8; 74 sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8); 75 for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) 76 { 77 trad_frame_set_reg_addr (this_cache, regnum, addr); 78 addr += 8; 79 } 80 81 trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0); 82 trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8); 83 trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16); 84 trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24); 85 trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28); 86 87 base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); 88 if (base & 1) 89 base += BIAS; 90 91 addr = get_frame_memory_unsigned (next_frame, sp_addr, 8); 92 if (addr & 1) 93 addr += BIAS; 94 95 for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) 96 { 97 trad_frame_set_reg_addr (this_cache, regnum, addr); 98 addr += 8; 99 } 100 trad_frame_set_id (this_cache, frame_id_build (base, func)); 101} 102 103/* Return the address of a system call's alternative return 104 address. */ 105 106static CORE_ADDR 107sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn) 108{ 109 if (insn == 0x91d0206d) 110 { 111 ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM); 112 if (sp & 1) 113 sp += BIAS; 114 115 /* The kernel puts the sigreturn registers on the stack, 116 and this is where the signal unwinding state is take from 117 when returning from a signal. 118 119 A siginfo_t sits 192 bytes from the base of the stack. This 120 siginfo_t is 128 bytes, and is followed by the sigreturn 121 register save area. The saved PC sits at a 136 byte offset 122 into there. */ 123 124 return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8); 125 } 126 127 return 0; 128} 129 130 131const struct sparc_gregset sparc64_linux_core_gregset = 132{ 133 32 * 8, /* %tstate */ 134 33 * 8, /* %tpc */ 135 34 * 8, /* %tnpc */ 136 35 * 8, /* %y */ 137 -1, /* %wim */ 138 -1, /* %tbr */ 139 1 * 8, /* %g1 */ 140 16 * 8, /* %l0 */ 141 8, /* y size */ 142}; 143 144 145static void 146sparc64_linux_supply_core_gregset (const struct regset *regset, 147 struct regcache *regcache, 148 int regnum, const void *gregs, size_t len) 149{ 150 sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); 151} 152 153static void 154sparc64_linux_collect_core_gregset (const struct regset *regset, 155 const struct regcache *regcache, 156 int regnum, void *gregs, size_t len) 157{ 158 sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); 159} 160 161static void 162sparc64_linux_supply_core_fpregset (const struct regset *regset, 163 struct regcache *regcache, 164 int regnum, const void *fpregs, size_t len) 165{ 166 sparc64_supply_fpregset (regcache, regnum, fpregs); 167} 168 169static void 170sparc64_linux_collect_core_fpregset (const struct regset *regset, 171 const struct regcache *regcache, 172 int regnum, void *fpregs, size_t len) 173{ 174 sparc64_collect_fpregset (regcache, regnum, fpregs); 175} 176 177 178 179static void 180sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 181{ 182 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 183 184 tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset, 185 sparc64_linux_collect_core_gregset); 186 tdep->sizeof_gregset = 288; 187 188 tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset, 189 sparc64_linux_collect_core_fpregset); 190 tdep->sizeof_fpregset = 280; 191 192 tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); 193 194 /* Hook in the DWARF CFI frame unwinder. */ 195 frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); 196 197 sparc64_init_abi (info, gdbarch); 198 199 /* GNU/Linux has SVR4-style shared libraries... */ 200 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 201 set_solib_svr4_fetch_link_map_offsets 202 (gdbarch, svr4_lp64_fetch_link_map_offsets); 203 204 /* ...which means that we need some special handling when doing 205 prologue analysis. */ 206 tdep->plt_entry_size = 16; 207 208 /* Enable TLS support. */ 209 set_gdbarch_fetch_tls_load_module_address (gdbarch, 210 svr4_fetch_objfile_link_map); 211 212 /* Make sure we can single-step over signal return system calls. */ 213 tdep->step_trap = sparc64_linux_step_trap; 214} 215 216 217/* Provide a prototype to silence -Wmissing-prototypes. */ 218extern void _initialize_sparc64_linux_tdep (void); 219 220void 221_initialize_sparc64_linux_tdep (void) 222{ 223 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, 224 GDB_OSABI_LINUX, sparc64_linux_init_abi); 225} 226