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 3 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, see <http://www.gnu.org/licenses/>. */
21 #include "ia64-tdep.h"
22 #include "arch-utils.h"
26 #include "solib-svr4.h"
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. */
34 #define GATE_AREA_START 0xa000000000000100LL
35 #define GATE_AREA_END 0xa000000000020000LL
37 /* Offset to sigcontext structure from frame of handler */
38 #define IA64_LINUX_SIGCONTEXT_OFFSET 192
41 ia64_linux_pc_in_sigtramp (CORE_ADDR pc)
43 return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
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. */
52 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
55 CORE_ADDR sigcontext_addr = 0;
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);
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);
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
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;
92 return sigcontext_addr + 120;
94 return sigcontext_addr + 128;
101 ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
103 ia64_write_pc (regcache, pc);
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.
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);
118 ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
120 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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;
126 /* Set the pc_in_sigtramp method. */
127 tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp;
129 set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc);
131 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
133 set_solib_svr4_fetch_link_map_offsets
134 (gdbarch, svr4_lp64_fetch_link_map_offsets);
136 /* Enable TLS support. */
137 set_gdbarch_fetch_tls_load_module_address (gdbarch,
138 svr4_fetch_objfile_link_map);
142 _initialize_ia64_linux_tdep (void)
144 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
145 ia64_linux_init_abi);