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386c036b MK |
1 | /* Target-dependent code for GNU/Linux UltraSPARC. |
2 | ||
197e01b6 | 3 | Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. |
386c036b MK |
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. */ | |
386c036b MK |
21 | |
22 | #include "defs.h" | |
78a0fd57 DM |
23 | #include "frame.h" |
24 | #include "frame-unwind.h" | |
0b4294d3 | 25 | #include "regcache.h" |
386c036b | 26 | #include "gdbarch.h" |
0b4294d3 | 27 | #include "gdbcore.h" |
386c036b | 28 | #include "osabi.h" |
b2756930 | 29 | #include "solib-svr4.h" |
78a0fd57 DM |
30 | #include "symtab.h" |
31 | #include "trad-frame.h" | |
70f1dc74 | 32 | #include "tramp-frame.h" |
78a0fd57 | 33 | |
386c036b MK |
34 | #include "sparc64-tdep.h" |
35 | ||
70f1dc74 | 36 | /* Signal trampoline support. */ |
78a0fd57 | 37 | |
81f726ab DM |
38 | static void sparc64_linux_sigframe_init (const struct tramp_frame *self, |
39 | struct frame_info *next_frame, | |
40 | struct trad_frame_cache *this_cache, | |
41 | CORE_ADDR func); | |
78a0fd57 | 42 | |
70f1dc74 MK |
43 | /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only |
44 | use RT signals. */ | |
45 | ||
46 | static const struct tramp_frame sparc64_linux_rt_sigframe = | |
47 | { | |
81f726ab DM |
48 | SIGTRAMP_FRAME, |
49 | 4, | |
50 | { | |
70f1dc74 MK |
51 | { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ |
52 | { 0x91d0206d, -1 }, /* ta 0x6d */ | |
81f726ab DM |
53 | { TRAMP_SENTINEL_INSN, -1 } |
54 | }, | |
55 | sparc64_linux_sigframe_init | |
56 | }; | |
78a0fd57 | 57 | |
81f726ab DM |
58 | static void |
59 | sparc64_linux_sigframe_init (const struct tramp_frame *self, | |
60 | struct frame_info *next_frame, | |
61 | struct trad_frame_cache *this_cache, | |
62 | CORE_ADDR func) | |
78a0fd57 | 63 | { |
80f9e3aa | 64 | CORE_ADDR base, addr, sp_addr; |
78a0fd57 DM |
65 | int regnum; |
66 | ||
81f726ab DM |
67 | base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM); |
68 | base += 128; | |
78a0fd57 | 69 | |
70f1dc74 | 70 | /* Offsets from <bits/sigcontext.h>. */ |
78a0fd57 DM |
71 | |
72 | /* Since %g0 is always zero, keep the identity encoding. */ | |
70f1dc74 | 73 | addr = base + 8; |
80f9e3aa | 74 | sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8); |
81f726ab DM |
75 | for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
76 | { | |
77 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
78 | addr += 8; | |
79 | } | |
78a0fd57 | 80 | |
70f1dc74 MK |
81 | trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0); |
82 | trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8); | |
83 | trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16); | |
84 | trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24); | |
85 | trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28); | |
78a0fd57 | 86 | |
80f9e3aa DM |
87 | base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); |
88 | if (base & 1) | |
89 | base += BIAS; | |
90 | ||
91 | addr = get_frame_memory_unsigned (next_frame, sp_addr, 8); | |
81f726ab DM |
92 | if (addr & 1) |
93 | addr += BIAS; | |
78a0fd57 | 94 | |
81f726ab DM |
95 | for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
96 | { | |
97 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
98 | addr += 8; | |
99 | } | |
100 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
78a0fd57 DM |
101 | } |
102 | \f | |
0b4294d3 DM |
103 | /* Return the address of a system call's alternative return |
104 | address. */ | |
105 | ||
106 | static CORE_ADDR | |
107 | sparc64_linux_step_trap (unsigned long insn) | |
108 | { | |
109 | if (insn == 0x91d0206d) | |
110 | { | |
111 | ULONGEST sp; | |
112 | ||
113 | regcache_cooked_read_unsigned (current_regcache, | |
114 | SPARC_SP_REGNUM, &sp); | |
115 | if (sp & 1) | |
116 | sp += BIAS; | |
117 | ||
118 | /* The kernel puts the sigreturn registers on the stack, | |
119 | and this is where the signal unwinding state is take from | |
120 | when returning from a signal. | |
121 | ||
122 | A siginfo_t sits 192 bytes from the base of the stack. This | |
123 | siginfo_t is 128 bytes, and is followed by the sigreturn | |
124 | register save area. The saved PC sits at a 136 byte offset | |
125 | into there. */ | |
126 | ||
127 | return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8); | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | \f | |
70f1dc74 | 133 | |
386c036b MK |
134 | static void |
135 | sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
136 | { | |
137 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
138 | ||
81f726ab | 139 | tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); |
78a0fd57 | 140 | |
20338726 DM |
141 | sparc64_init_abi (info, gdbarch); |
142 | ||
a33e488c MK |
143 | /* GNU/Linux has SVR4-style shared libraries... */ |
144 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
145 | set_solib_svr4_fetch_link_map_offsets | |
146 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
386c036b | 147 | |
a33e488c MK |
148 | /* ...which means that we need some special handling when doing |
149 | prologue analysis. */ | |
150 | tdep->plt_entry_size = 16; | |
b2756930 KB |
151 | |
152 | /* Enable TLS support. */ | |
153 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
154 | svr4_fetch_objfile_link_map); | |
0b4294d3 DM |
155 | |
156 | /* Make sure we can single-step over signal return system calls. */ | |
157 | tdep->step_trap = sparc64_linux_step_trap; | |
386c036b | 158 | } |
70f1dc74 | 159 | \f |
386c036b MK |
160 | |
161 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
162 | extern void _initialize_sparc64_linux_tdep (void); | |
163 | ||
164 | void | |
165 | _initialize_sparc64_linux_tdep (void) | |
166 | { | |
167 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
168 | GDB_OSABI_LINUX, sparc64_linux_init_abi); | |
169 | } |