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244bc108 | 1 | /* Target-dependent code for the IA-64 for GDB, the GNU debugger. |
9fc9f5e2 | 2 | |
9b254dd1 | 3 | Copyright (C) 2000, 2004, 2005, 2007, 2008 Free Software Foundation, Inc. |
244bc108 KB |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
244bc108 KB |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
244bc108 KB |
19 | |
20 | #include "defs.h" | |
9fc9f5e2 | 21 | #include "ia64-tdep.h" |
8064c6ae | 22 | #include "arch-utils.h" |
51931cbb | 23 | #include "gdbcore.h" |
54a5c8d8 | 24 | #include "regcache.h" |
b33e8514 | 25 | #include "osabi.h" |
b2756930 | 26 | #include "solib-svr4.h" |
982e9687 | 27 | #include "symtab.h" |
244bc108 KB |
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 | |
bfec0b41 | 35 | #define GATE_AREA_END 0xa000000000020000LL |
244bc108 KB |
36 | |
37 | /* Offset to sigcontext structure from frame of handler */ | |
d469a809 | 38 | #define IA64_LINUX_SIGCONTEXT_OFFSET 192 |
244bc108 | 39 | |
74174d2e UW |
40 | static int |
41 | ia64_linux_pc_in_sigtramp (CORE_ADDR pc) | |
244bc108 KB |
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 | ||
b33e8514 | 51 | static CORE_ADDR |
244bc108 KB |
52 | ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno) |
53 | { | |
51931cbb JJ |
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 | ||
244bc108 | 61 | if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) |
51931cbb | 62 | return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); |
244bc108 | 63 | else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) |
51931cbb | 64 | return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); |
244bc108 | 65 | else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) |
51931cbb | 66 | return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); |
244bc108 KB |
67 | else |
68 | switch (regno) | |
69 | { | |
70 | case IA64_IP_REGNUM : | |
51931cbb | 71 | return sigcontext_addr + 40; |
244bc108 | 72 | case IA64_CFM_REGNUM : |
51931cbb | 73 | return sigcontext_addr + 48; |
244bc108 | 74 | case IA64_PSR_REGNUM : |
51931cbb | 75 | return sigcontext_addr + 56; /* user mask only */ |
244bc108 KB |
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 : | |
51931cbb | 80 | return sigcontext_addr + 72; |
244bc108 | 81 | case IA64_RNAT_REGNUM : |
51931cbb | 82 | return sigcontext_addr + 80; |
244bc108 | 83 | case IA64_CCV_REGNUM : |
51931cbb | 84 | return sigcontext_addr + 88; |
244bc108 | 85 | case IA64_UNAT_REGNUM : |
51931cbb | 86 | return sigcontext_addr + 96; |
244bc108 | 87 | case IA64_FPSR_REGNUM : |
51931cbb | 88 | return sigcontext_addr + 104; |
244bc108 | 89 | case IA64_PFS_REGNUM : |
51931cbb | 90 | return sigcontext_addr + 112; |
244bc108 | 91 | case IA64_LC_REGNUM : |
51931cbb | 92 | return sigcontext_addr + 120; |
244bc108 | 93 | case IA64_PR_REGNUM : |
51931cbb | 94 | return sigcontext_addr + 128; |
244bc108 KB |
95 | default : |
96 | return 0; | |
97 | } | |
98 | } | |
54a5c8d8 | 99 | |
b33e8514 | 100 | static void |
61a1198a | 101 | ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
54a5c8d8 | 102 | { |
61a1198a | 103 | ia64_write_pc (regcache, pc); |
54a5c8d8 KB |
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. */ | |
61a1198a | 114 | regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0); |
54a5c8d8 | 115 | } |
b33e8514 AS |
116 | |
117 | static void | |
118 | ia64_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 | ||
74174d2e UW |
126 | /* Set the pc_in_sigtramp method. */ |
127 | tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp; | |
128 | ||
b33e8514 | 129 | set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc); |
b2756930 | 130 | |
982e9687 UW |
131 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
132 | ||
8d005789 UW |
133 | set_solib_svr4_fetch_link_map_offsets |
134 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
135 | ||
b2756930 KB |
136 | /* Enable TLS support. */ |
137 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
138 | svr4_fetch_objfile_link_map); | |
b33e8514 AS |
139 | } |
140 | ||
141 | void | |
142 | _initialize_ia64_linux_tdep (void) | |
143 | { | |
144 | gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX, | |
145 | ia64_linux_init_abi); | |
146 | } |