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244bc108 | 1 | /* Target-dependent code for the IA-64 for GDB, the GNU debugger. |
9fc9f5e2 | 2 | |
197e01b6 | 3 | Copyright (C) 2000, 2004, 2005 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 | |
9 | the Free Software Foundation; either version 2 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, write to the Free Software | |
197e01b6 EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
244bc108 KB |
21 | |
22 | #include "defs.h" | |
9fc9f5e2 | 23 | #include "ia64-tdep.h" |
8064c6ae | 24 | #include "arch-utils.h" |
51931cbb | 25 | #include "gdbcore.h" |
54a5c8d8 | 26 | #include "regcache.h" |
b33e8514 | 27 | #include "osabi.h" |
b2756930 | 28 | #include "solib-svr4.h" |
982e9687 | 29 | #include "symtab.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 | |
34 | overly generous to allow for different pages sizes. */ | |
35 | ||
36 | #define GATE_AREA_START 0xa000000000000100LL | |
bfec0b41 | 37 | #define GATE_AREA_END 0xa000000000020000LL |
244bc108 KB |
38 | |
39 | /* Offset to sigcontext structure from frame of handler */ | |
d469a809 | 40 | #define IA64_LINUX_SIGCONTEXT_OFFSET 192 |
244bc108 KB |
41 | |
42 | int | |
43 | ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name) | |
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 | |
50 | found. 0 is returned for registers which aren't stored in the the | |
51 | sigcontext structure. */ | |
52 | ||
b33e8514 | 53 | static CORE_ADDR |
244bc108 KB |
54 | ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno) |
55 | { | |
51931cbb JJ |
56 | char buf[8]; |
57 | CORE_ADDR sigcontext_addr = 0; | |
58 | ||
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); | |
62 | ||
244bc108 | 63 | if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) |
51931cbb | 64 | return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); |
244bc108 | 65 | else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) |
51931cbb | 66 | return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); |
244bc108 | 67 | else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) |
51931cbb | 68 | return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); |
244bc108 KB |
69 | else |
70 | switch (regno) | |
71 | { | |
72 | case IA64_IP_REGNUM : | |
51931cbb | 73 | return sigcontext_addr + 40; |
244bc108 | 74 | case IA64_CFM_REGNUM : |
51931cbb | 75 | return sigcontext_addr + 48; |
244bc108 | 76 | case IA64_PSR_REGNUM : |
51931cbb | 77 | return sigcontext_addr + 56; /* user mask only */ |
244bc108 KB |
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 | |
80 | 64 */ | |
81 | case IA64_BSP_REGNUM : | |
51931cbb | 82 | return sigcontext_addr + 72; |
244bc108 | 83 | case IA64_RNAT_REGNUM : |
51931cbb | 84 | return sigcontext_addr + 80; |
244bc108 | 85 | case IA64_CCV_REGNUM : |
51931cbb | 86 | return sigcontext_addr + 88; |
244bc108 | 87 | case IA64_UNAT_REGNUM : |
51931cbb | 88 | return sigcontext_addr + 96; |
244bc108 | 89 | case IA64_FPSR_REGNUM : |
51931cbb | 90 | return sigcontext_addr + 104; |
244bc108 | 91 | case IA64_PFS_REGNUM : |
51931cbb | 92 | return sigcontext_addr + 112; |
244bc108 | 93 | case IA64_LC_REGNUM : |
51931cbb | 94 | return sigcontext_addr + 120; |
244bc108 | 95 | case IA64_PR_REGNUM : |
51931cbb | 96 | return sigcontext_addr + 128; |
244bc108 KB |
97 | default : |
98 | return 0; | |
99 | } | |
100 | } | |
54a5c8d8 | 101 | |
b33e8514 | 102 | static void |
54a5c8d8 KB |
103 | ia64_linux_write_pc (CORE_ADDR pc, ptid_t ptid) |
104 | { | |
105 | ia64_write_pc (pc, ptid); | |
106 | ||
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. | |
113 | ||
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); | |
117 | } | |
b33e8514 AS |
118 | |
119 | static void | |
120 | ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
121 | { | |
122 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
123 | ||
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; | |
127 | ||
128 | set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc); | |
b2756930 | 129 | |
982e9687 UW |
130 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
131 | ||
b2756930 KB |
132 | /* Enable TLS support. */ |
133 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
134 | svr4_fetch_objfile_link_map); | |
b33e8514 AS |
135 | } |
136 | ||
137 | void | |
138 | _initialize_ia64_linux_tdep (void) | |
139 | { | |
140 | gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX, | |
141 | ia64_linux_init_abi); | |
142 | } |