Commit | Line | Data |
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244bc108 | 1 | /* Target-dependent code for the IA-64 for GDB, the GNU debugger. |
9fc9f5e2 | 2 | |
0b302171 JB |
3 | Copyright (C) 2000, 2004-2005, 2007-2012 Free Software Foundation, |
4 | Inc. | |
244bc108 KB |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
244bc108 KB |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
244bc108 KB |
20 | |
21 | #include "defs.h" | |
9fc9f5e2 | 22 | #include "ia64-tdep.h" |
8064c6ae | 23 | #include "arch-utils.h" |
51931cbb | 24 | #include "gdbcore.h" |
54a5c8d8 | 25 | #include "regcache.h" |
b33e8514 | 26 | #include "osabi.h" |
b2756930 | 27 | #include "solib-svr4.h" |
982e9687 | 28 | #include "symtab.h" |
a5ee0f0c | 29 | #include "linux-tdep.h" |
244bc108 KB |
30 | |
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 | |
1777feb0 | 34 | overly generous to allow for different pages sizes. */ |
244bc108 KB |
35 | |
36 | #define GATE_AREA_START 0xa000000000000100LL | |
bfec0b41 | 37 | #define GATE_AREA_END 0xa000000000020000LL |
244bc108 | 38 | |
1777feb0 | 39 | /* Offset to sigcontext structure from frame of handler. */ |
d469a809 | 40 | #define IA64_LINUX_SIGCONTEXT_OFFSET 192 |
244bc108 | 41 | |
74174d2e UW |
42 | static int |
43 | ia64_linux_pc_in_sigtramp (CORE_ADDR pc) | |
244bc108 KB |
44 | { |
45 | return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END); | |
46 | } | |
47 | ||
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 | |
7a9dd1b2 | 50 | found. 0 is returned for registers which aren't stored in the |
1777feb0 | 51 | sigcontext structure. */ |
244bc108 | 52 | |
b33e8514 | 53 | static CORE_ADDR |
e17a4113 UW |
54 | ia64_linux_sigcontext_register_address (struct gdbarch *gdbarch, |
55 | CORE_ADDR sp, int regno) | |
244bc108 | 56 | { |
e17a4113 | 57 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
51931cbb JJ |
58 | char buf[8]; |
59 | CORE_ADDR sigcontext_addr = 0; | |
60 | ||
1777feb0 MS |
61 | /* The address of the sigcontext area is found at offset 16 in the |
62 | sigframe. */ | |
51931cbb | 63 | read_memory (sp + 16, buf, 8); |
e17a4113 | 64 | sigcontext_addr = extract_unsigned_integer (buf, 8, byte_order); |
51931cbb | 65 | |
244bc108 | 66 | if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) |
51931cbb | 67 | return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); |
244bc108 | 68 | else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) |
51931cbb | 69 | return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); |
244bc108 | 70 | else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) |
51931cbb | 71 | return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); |
244bc108 KB |
72 | else |
73 | switch (regno) | |
74 | { | |
75 | case IA64_IP_REGNUM : | |
51931cbb | 76 | return sigcontext_addr + 40; |
244bc108 | 77 | case IA64_CFM_REGNUM : |
51931cbb | 78 | return sigcontext_addr + 48; |
244bc108 | 79 | case IA64_PSR_REGNUM : |
51931cbb | 80 | return sigcontext_addr + 56; /* user mask only */ |
244bc108 KB |
81 | /* sc_ar_rsc is provided, from which we could compute bspstore, but |
82 | I don't think it's worth it. Anyway, if we want it, it's at offset | |
1777feb0 | 83 | 64. */ |
244bc108 | 84 | case IA64_BSP_REGNUM : |
51931cbb | 85 | return sigcontext_addr + 72; |
244bc108 | 86 | case IA64_RNAT_REGNUM : |
51931cbb | 87 | return sigcontext_addr + 80; |
244bc108 | 88 | case IA64_CCV_REGNUM : |
51931cbb | 89 | return sigcontext_addr + 88; |
244bc108 | 90 | case IA64_UNAT_REGNUM : |
51931cbb | 91 | return sigcontext_addr + 96; |
244bc108 | 92 | case IA64_FPSR_REGNUM : |
51931cbb | 93 | return sigcontext_addr + 104; |
244bc108 | 94 | case IA64_PFS_REGNUM : |
51931cbb | 95 | return sigcontext_addr + 112; |
244bc108 | 96 | case IA64_LC_REGNUM : |
51931cbb | 97 | return sigcontext_addr + 120; |
244bc108 | 98 | case IA64_PR_REGNUM : |
51931cbb | 99 | return sigcontext_addr + 128; |
244bc108 KB |
100 | default : |
101 | return 0; | |
102 | } | |
103 | } | |
54a5c8d8 | 104 | |
b33e8514 | 105 | static void |
61a1198a | 106 | ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
54a5c8d8 | 107 | { |
61a1198a | 108 | ia64_write_pc (regcache, pc); |
54a5c8d8 KB |
109 | |
110 | /* We must be careful with modifying the instruction-pointer: if we | |
111 | just interrupt a system call, the kernel would ordinarily try to | |
112 | restart it when we resume the inferior, which typically results | |
113 | in SIGSEGV or SIGILL. We prevent this by clearing r10, which | |
114 | will tell the kernel that r8 does NOT contain a valid error code | |
115 | and hence it will skip system-call restart. | |
116 | ||
117 | The clearing of r10 is safe as long as ia64_write_pc() is only | |
118 | called as part of setting up an inferior call. */ | |
61a1198a | 119 | regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0); |
54a5c8d8 | 120 | } |
b33e8514 AS |
121 | |
122 | static void | |
123 | ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
124 | { | |
125 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
126 | ||
a5ee0f0c PA |
127 | linux_init_abi (info, gdbarch); |
128 | ||
b33e8514 AS |
129 | /* Set the method of obtaining the sigcontext addresses at which |
130 | registers are saved. */ | |
131 | tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address; | |
132 | ||
74174d2e UW |
133 | /* Set the pc_in_sigtramp method. */ |
134 | tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp; | |
135 | ||
b33e8514 | 136 | set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc); |
b2756930 | 137 | |
982e9687 UW |
138 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
139 | ||
8d005789 UW |
140 | set_solib_svr4_fetch_link_map_offsets |
141 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
142 | ||
b2756930 KB |
143 | /* Enable TLS support. */ |
144 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
145 | svr4_fetch_objfile_link_map); | |
b33e8514 AS |
146 | } |
147 | ||
63807e1d PA |
148 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
149 | extern initialize_file_ftype _initialize_ia64_linux_tdep; | |
150 | ||
b33e8514 AS |
151 | void |
152 | _initialize_ia64_linux_tdep (void) | |
153 | { | |
154 | gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX, | |
155 | ia64_linux_init_abi); | |
156 | } |