1 /* Target-dependent code for the IA-64 for GDB, the GNU debugger.
3 Copyright (C) 2000, 2004, 2005, 2007 Free Software Foundation, Inc.
5 This file is part of GDB.
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 2 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 #include "ia64-tdep.h"
24 #include "arch-utils.h"
28 #include "solib-svr4.h"
31 /* The sigtramp code is in a non-readable (executable-only) region
32 of memory called the ``gate page''. The addresses in question
33 were determined by examining the system headers. They are
34 overly generous to allow for different pages sizes. */
36 #define GATE_AREA_START 0xa000000000000100LL
37 #define GATE_AREA_END 0xa000000000020000LL
39 /* Offset to sigcontext structure from frame of handler */
40 #define IA64_LINUX_SIGCONTEXT_OFFSET 192
43 ia64_linux_pc_in_sigtramp (CORE_ADDR pc)
45 return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
48 /* IA-64 GNU/Linux specific function which, given a frame address and
49 a register number, returns the address at which that register may be
50 found. 0 is returned for registers which aren't stored in the the
51 sigcontext structure. */
54 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
57 CORE_ADDR sigcontext_addr = 0;
59 /* The address of the sigcontext area is found at offset 16 in the sigframe. */
60 read_memory (sp + 16, buf, 8);
61 sigcontext_addr = extract_unsigned_integer (buf, 8);
63 if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
64 return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
65 else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
66 return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
67 else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
68 return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
73 return sigcontext_addr + 40;
74 case IA64_CFM_REGNUM :
75 return sigcontext_addr + 48;
76 case IA64_PSR_REGNUM :
77 return sigcontext_addr + 56; /* user mask only */
78 /* sc_ar_rsc is provided, from which we could compute bspstore, but
79 I don't think it's worth it. Anyway, if we want it, it's at offset
81 case IA64_BSP_REGNUM :
82 return sigcontext_addr + 72;
83 case IA64_RNAT_REGNUM :
84 return sigcontext_addr + 80;
85 case IA64_CCV_REGNUM :
86 return sigcontext_addr + 88;
87 case IA64_UNAT_REGNUM :
88 return sigcontext_addr + 96;
89 case IA64_FPSR_REGNUM :
90 return sigcontext_addr + 104;
91 case IA64_PFS_REGNUM :
92 return sigcontext_addr + 112;
94 return sigcontext_addr + 120;
96 return sigcontext_addr + 128;
103 ia64_linux_write_pc (CORE_ADDR pc, ptid_t ptid)
105 ia64_write_pc (pc, ptid);
107 /* We must be careful with modifying the instruction-pointer: if we
108 just interrupt a system call, the kernel would ordinarily try to
109 restart it when we resume the inferior, which typically results
110 in SIGSEGV or SIGILL. We prevent this by clearing r10, which
111 will tell the kernel that r8 does NOT contain a valid error code
112 and hence it will skip system-call restart.
114 The clearing of r10 is safe as long as ia64_write_pc() is only
115 called as part of setting up an inferior call. */
116 write_register_pid (IA64_GR10_REGNUM, 0, ptid);
120 ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
122 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
124 /* Set the method of obtaining the sigcontext addresses at which
125 registers are saved. */
126 tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address;
128 /* Set the pc_in_sigtramp method. */
129 tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp;
131 set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc);
133 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
135 /* Enable TLS support. */
136 set_gdbarch_fetch_tls_load_module_address (gdbarch,
137 svr4_fetch_objfile_link_map);
141 _initialize_ia64_linux_tdep (void)
143 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
144 ia64_linux_init_abi);