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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" | |
07c5f590 | 25 | #include "regset.h" |
0b4294d3 | 26 | #include "regcache.h" |
386c036b | 27 | #include "gdbarch.h" |
0b4294d3 | 28 | #include "gdbcore.h" |
386c036b | 29 | #include "osabi.h" |
b2756930 | 30 | #include "solib-svr4.h" |
78a0fd57 DM |
31 | #include "symtab.h" |
32 | #include "trad-frame.h" | |
70f1dc74 | 33 | #include "tramp-frame.h" |
78a0fd57 | 34 | |
386c036b MK |
35 | #include "sparc64-tdep.h" |
36 | ||
70f1dc74 | 37 | /* Signal trampoline support. */ |
78a0fd57 | 38 | |
81f726ab DM |
39 | static void sparc64_linux_sigframe_init (const struct tramp_frame *self, |
40 | struct frame_info *next_frame, | |
41 | struct trad_frame_cache *this_cache, | |
42 | CORE_ADDR func); | |
78a0fd57 | 43 | |
70f1dc74 MK |
44 | /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only |
45 | use RT signals. */ | |
46 | ||
47 | static const struct tramp_frame sparc64_linux_rt_sigframe = | |
48 | { | |
81f726ab DM |
49 | SIGTRAMP_FRAME, |
50 | 4, | |
51 | { | |
70f1dc74 MK |
52 | { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */ |
53 | { 0x91d0206d, -1 }, /* ta 0x6d */ | |
81f726ab DM |
54 | { TRAMP_SENTINEL_INSN, -1 } |
55 | }, | |
56 | sparc64_linux_sigframe_init | |
57 | }; | |
78a0fd57 | 58 | |
81f726ab DM |
59 | static void |
60 | sparc64_linux_sigframe_init (const struct tramp_frame *self, | |
61 | struct frame_info *next_frame, | |
62 | struct trad_frame_cache *this_cache, | |
63 | CORE_ADDR func) | |
78a0fd57 | 64 | { |
80f9e3aa | 65 | CORE_ADDR base, addr, sp_addr; |
78a0fd57 DM |
66 | int regnum; |
67 | ||
81f726ab DM |
68 | base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM); |
69 | base += 128; | |
78a0fd57 | 70 | |
70f1dc74 | 71 | /* Offsets from <bits/sigcontext.h>. */ |
78a0fd57 DM |
72 | |
73 | /* Since %g0 is always zero, keep the identity encoding. */ | |
70f1dc74 | 74 | addr = base + 8; |
80f9e3aa | 75 | sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8); |
81f726ab DM |
76 | for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
77 | { | |
78 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
79 | addr += 8; | |
80 | } | |
78a0fd57 | 81 | |
70f1dc74 MK |
82 | trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0); |
83 | trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8); | |
84 | trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16); | |
85 | trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24); | |
86 | trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28); | |
78a0fd57 | 87 | |
80f9e3aa DM |
88 | base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); |
89 | if (base & 1) | |
90 | base += BIAS; | |
91 | ||
92 | addr = get_frame_memory_unsigned (next_frame, sp_addr, 8); | |
81f726ab DM |
93 | if (addr & 1) |
94 | addr += BIAS; | |
78a0fd57 | 95 | |
81f726ab DM |
96 | for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
97 | { | |
98 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
99 | addr += 8; | |
100 | } | |
101 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
78a0fd57 DM |
102 | } |
103 | \f | |
0b4294d3 DM |
104 | /* Return the address of a system call's alternative return |
105 | address. */ | |
106 | ||
107 | static CORE_ADDR | |
108 | sparc64_linux_step_trap (unsigned long insn) | |
109 | { | |
110 | if (insn == 0x91d0206d) | |
111 | { | |
112 | ULONGEST sp; | |
113 | ||
114 | regcache_cooked_read_unsigned (current_regcache, | |
115 | SPARC_SP_REGNUM, &sp); | |
116 | if (sp & 1) | |
117 | sp += BIAS; | |
118 | ||
119 | /* The kernel puts the sigreturn registers on the stack, | |
120 | and this is where the signal unwinding state is take from | |
121 | when returning from a signal. | |
122 | ||
123 | A siginfo_t sits 192 bytes from the base of the stack. This | |
124 | siginfo_t is 128 bytes, and is followed by the sigreturn | |
125 | register save area. The saved PC sits at a 136 byte offset | |
126 | into there. */ | |
127 | ||
128 | return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8); | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | \f | |
70f1dc74 | 134 | |
07c5f590 DM |
135 | const struct sparc_gregset sparc64_linux_core_gregset = |
136 | { | |
137 | 32 * 8, /* %tstate */ | |
138 | 33 * 8, /* %tpc */ | |
139 | 34 * 8, /* %tnpc */ | |
140 | 35 * 8, /* %y */ | |
141 | -1, /* %wim */ | |
142 | -1, /* %tbr */ | |
143 | 1 * 8, /* %g1 */ | |
144 | 16 * 8, /* %l0 */ | |
145 | 8, /* y size */ | |
146 | }; | |
147 | \f | |
148 | ||
149 | static void | |
150 | sparc64_linux_supply_core_gregset (const struct regset *regset, | |
151 | struct regcache *regcache, | |
152 | int regnum, const void *gregs, size_t len) | |
153 | { | |
154 | sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); | |
155 | } | |
156 | ||
157 | static void | |
158 | sparc64_linux_collect_core_gregset (const struct regset *regset, | |
159 | const struct regcache *regcache, | |
160 | int regnum, void *gregs, size_t len) | |
161 | { | |
162 | sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); | |
163 | } | |
164 | ||
165 | static void | |
166 | sparc64_linux_supply_core_fpregset (const struct regset *regset, | |
167 | struct regcache *regcache, | |
168 | int regnum, const void *fpregs, size_t len) | |
169 | { | |
170 | sparc64_supply_fpregset (regcache, regnum, fpregs); | |
171 | } | |
172 | ||
173 | static void | |
174 | sparc64_linux_collect_core_fpregset (const struct regset *regset, | |
175 | const struct regcache *regcache, | |
176 | int regnum, void *fpregs, size_t len) | |
177 | { | |
178 | sparc64_collect_fpregset (regcache, regnum, fpregs); | |
179 | } | |
180 | ||
181 | \f | |
182 | ||
386c036b MK |
183 | static void |
184 | sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
185 | { | |
186 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
187 | ||
07c5f590 DM |
188 | tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset, |
189 | sparc64_linux_collect_core_gregset); | |
190 | tdep->sizeof_gregset = 288; | |
191 | ||
192 | tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset, | |
193 | sparc64_linux_collect_core_fpregset); | |
194 | tdep->sizeof_fpregset = 280; | |
195 | ||
81f726ab | 196 | tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); |
78a0fd57 | 197 | |
20338726 DM |
198 | sparc64_init_abi (info, gdbarch); |
199 | ||
a33e488c MK |
200 | /* GNU/Linux has SVR4-style shared libraries... */ |
201 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
202 | set_solib_svr4_fetch_link_map_offsets | |
203 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
386c036b | 204 | |
a33e488c MK |
205 | /* ...which means that we need some special handling when doing |
206 | prologue analysis. */ | |
207 | tdep->plt_entry_size = 16; | |
b2756930 KB |
208 | |
209 | /* Enable TLS support. */ | |
210 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
211 | svr4_fetch_objfile_link_map); | |
0b4294d3 DM |
212 | |
213 | /* Make sure we can single-step over signal return system calls. */ | |
214 | tdep->step_trap = sparc64_linux_step_trap; | |
386c036b | 215 | } |
70f1dc74 | 216 | \f |
386c036b MK |
217 | |
218 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
219 | extern void _initialize_sparc64_linux_tdep (void); | |
220 | ||
221 | void | |
222 | _initialize_sparc64_linux_tdep (void) | |
223 | { | |
224 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
225 | GDB_OSABI_LINUX, sparc64_linux_init_abi); | |
226 | } |