1/* Target-dependent code for the IA-64 for GDB, the GNU debugger. 2 3 Copyright (C) 2000, 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 "ia64-tdep.h" 22#include "arch-utils.h" 23#include "gdbcore.h" 24#include "regcache.h" 25#include "osabi.h" 26#include "solib-svr4.h" 27#include "symtab.h" 28 29/* The sigtramp code is in a non-readable (executable-only) region 30 of memory called the ``gate page''. The addresses in question 31 were determined by examining the system headers. They are 32 overly generous to allow for different pages sizes. */ 33 34#define GATE_AREA_START 0xa000000000000100LL 35#define GATE_AREA_END 0xa000000000020000LL 36 37/* Offset to sigcontext structure from frame of handler */ 38#define IA64_LINUX_SIGCONTEXT_OFFSET 192 39 40static int 41ia64_linux_pc_in_sigtramp (CORE_ADDR pc) 42{ 43 return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END); 44} 45 46/* IA-64 GNU/Linux specific function which, given a frame address and 47 a register number, returns the address at which that register may be 48 found. 0 is returned for registers which aren't stored in the the 49 sigcontext structure. */ 50 51static CORE_ADDR 52ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno) 53{ 54 char buf[8]; 55 CORE_ADDR sigcontext_addr = 0; 56 57 /* The address of the sigcontext area is found at offset 16 in the sigframe. */ 58 read_memory (sp + 16, buf, 8); 59 sigcontext_addr = extract_unsigned_integer (buf, 8); 60 61 if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) 62 return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); 63 else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) 64 return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); 65 else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) 66 return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); 67 else 68 switch (regno) 69 { 70 case IA64_IP_REGNUM : 71 return sigcontext_addr + 40; 72 case IA64_CFM_REGNUM : 73 return sigcontext_addr + 48; 74 case IA64_PSR_REGNUM : 75 return sigcontext_addr + 56; /* user mask only */ 76 /* sc_ar_rsc is provided, from which we could compute bspstore, but 77 I don't think it's worth it. Anyway, if we want it, it's at offset 78 64 */ 79 case IA64_BSP_REGNUM : 80 return sigcontext_addr + 72; 81 case IA64_RNAT_REGNUM : 82 return sigcontext_addr + 80; 83 case IA64_CCV_REGNUM : 84 return sigcontext_addr + 88; 85 case IA64_UNAT_REGNUM : 86 return sigcontext_addr + 96; 87 case IA64_FPSR_REGNUM : 88 return sigcontext_addr + 104; 89 case IA64_PFS_REGNUM : 90 return sigcontext_addr + 112; 91 case IA64_LC_REGNUM : 92 return sigcontext_addr + 120; 93 case IA64_PR_REGNUM : 94 return sigcontext_addr + 128; 95 default : 96 return 0; 97 } 98} 99 100static void 101ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) 102{ 103 ia64_write_pc (regcache, pc); 104 105 /* We must be careful with modifying the instruction-pointer: if we 106 just interrupt a system call, the kernel would ordinarily try to 107 restart it when we resume the inferior, which typically results 108 in SIGSEGV or SIGILL. We prevent this by clearing r10, which 109 will tell the kernel that r8 does NOT contain a valid error code 110 and hence it will skip system-call restart. 111 112 The clearing of r10 is safe as long as ia64_write_pc() is only 113 called as part of setting up an inferior call. */ 114 regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0); 115} 116 117static void 118ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 119{ 120 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 121 122 /* Set the method of obtaining the sigcontext addresses at which 123 registers are saved. */ 124 tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address; 125 126 /* Set the pc_in_sigtramp method. */ 127 tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp; 128 129 set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc); 130 131 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 132 133 /* Enable TLS support. */ 134 set_gdbarch_fetch_tls_load_module_address (gdbarch, 135 svr4_fetch_objfile_link_map); 136} 137 138void 139_initialize_ia64_linux_tdep (void) 140{ 141 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX, 142 ia64_linux_init_abi); 143} 144