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386c036b MK |
1 | /* Target-dependent code for GNU/Linux UltraSPARC. |
2 | ||
0fb0cc75 JB |
3 | Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009 |
4 | Free Software Foundation, Inc. | |
386c036b MK |
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 |
386c036b MK |
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/>. */ |
386c036b MK |
20 | |
21 | #include "defs.h" | |
78a0fd57 DM |
22 | #include "frame.h" |
23 | #include "frame-unwind.h" | |
b2a0b9b2 | 24 | #include "dwarf2-frame.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 | 39 | static void sparc64_linux_sigframe_init (const struct tramp_frame *self, |
5366653e | 40 | struct frame_info *this_frame, |
81f726ab DM |
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, | |
5366653e | 61 | struct frame_info *this_frame, |
81f726ab DM |
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 | ||
5366653e | 68 | base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM); |
81f726ab | 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 | |
5366653e | 88 | base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
80f9e3aa DM |
89 | if (base & 1) |
90 | base += BIAS; | |
91 | ||
5366653e | 92 | addr = get_frame_memory_unsigned (this_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 | |
0b1b3e42 | 108 | sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn) |
0b4294d3 DM |
109 | { |
110 | if (insn == 0x91d0206d) | |
111 | { | |
0b1b3e42 | 112 | ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM); |
0b4294d3 DM |
113 | if (sp & 1) |
114 | sp += BIAS; | |
115 | ||
116 | /* The kernel puts the sigreturn registers on the stack, | |
117 | and this is where the signal unwinding state is take from | |
118 | when returning from a signal. | |
119 | ||
120 | A siginfo_t sits 192 bytes from the base of the stack. This | |
121 | siginfo_t is 128 bytes, and is followed by the sigreturn | |
122 | register save area. The saved PC sits at a 136 byte offset | |
123 | into there. */ | |
124 | ||
125 | return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8); | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | \f | |
70f1dc74 | 131 | |
07c5f590 DM |
132 | const struct sparc_gregset sparc64_linux_core_gregset = |
133 | { | |
134 | 32 * 8, /* %tstate */ | |
135 | 33 * 8, /* %tpc */ | |
136 | 34 * 8, /* %tnpc */ | |
137 | 35 * 8, /* %y */ | |
138 | -1, /* %wim */ | |
139 | -1, /* %tbr */ | |
140 | 1 * 8, /* %g1 */ | |
141 | 16 * 8, /* %l0 */ | |
142 | 8, /* y size */ | |
143 | }; | |
144 | \f | |
145 | ||
146 | static void | |
147 | sparc64_linux_supply_core_gregset (const struct regset *regset, | |
148 | struct regcache *regcache, | |
149 | int regnum, const void *gregs, size_t len) | |
150 | { | |
151 | sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); | |
152 | } | |
153 | ||
154 | static void | |
155 | sparc64_linux_collect_core_gregset (const struct regset *regset, | |
156 | const struct regcache *regcache, | |
157 | int regnum, void *gregs, size_t len) | |
158 | { | |
159 | sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs); | |
160 | } | |
161 | ||
162 | static void | |
163 | sparc64_linux_supply_core_fpregset (const struct regset *regset, | |
164 | struct regcache *regcache, | |
165 | int regnum, const void *fpregs, size_t len) | |
166 | { | |
167 | sparc64_supply_fpregset (regcache, regnum, fpregs); | |
168 | } | |
169 | ||
170 | static void | |
171 | sparc64_linux_collect_core_fpregset (const struct regset *regset, | |
172 | const struct regcache *regcache, | |
173 | int regnum, void *fpregs, size_t len) | |
174 | { | |
175 | sparc64_collect_fpregset (regcache, regnum, fpregs); | |
176 | } | |
177 | ||
e8467b5a DM |
178 | /* Set the program counter for process PTID to PC. */ |
179 | ||
180 | #define TSTATE_SYSCALL 0x0000000000000020ULL | |
181 | ||
182 | static void | |
183 | sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
184 | { | |
185 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache)); | |
186 | ULONGEST state; | |
187 | ||
188 | regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); | |
189 | regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); | |
190 | ||
191 | /* Clear the "in syscall" bit to prevent the kernel from | |
192 | messing with the PCs we just installed, if we happen to be | |
193 | within an interrupted system call that the kernel wants to | |
194 | restart. | |
195 | ||
196 | Note that after we return from the dummy call, the TSTATE et al. | |
197 | registers will be automatically restored, and the kernel | |
198 | continues to restart the system call at this point. */ | |
199 | regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state); | |
200 | state &= ~TSTATE_SYSCALL; | |
201 | regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state); | |
202 | } | |
203 | ||
07c5f590 DM |
204 | \f |
205 | ||
386c036b MK |
206 | static void |
207 | sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
208 | { | |
209 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
210 | ||
07c5f590 DM |
211 | tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset, |
212 | sparc64_linux_collect_core_gregset); | |
213 | tdep->sizeof_gregset = 288; | |
214 | ||
215 | tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset, | |
216 | sparc64_linux_collect_core_fpregset); | |
217 | tdep->sizeof_fpregset = 280; | |
218 | ||
81f726ab | 219 | tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe); |
78a0fd57 | 220 | |
b2a0b9b2 | 221 | /* Hook in the DWARF CFI frame unwinder. */ |
87a7da84 | 222 | dwarf2_append_unwinders (gdbarch); |
b2a0b9b2 | 223 | |
20338726 DM |
224 | sparc64_init_abi (info, gdbarch); |
225 | ||
a33e488c MK |
226 | /* GNU/Linux has SVR4-style shared libraries... */ |
227 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
228 | set_solib_svr4_fetch_link_map_offsets | |
229 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
386c036b | 230 | |
a33e488c MK |
231 | /* ...which means that we need some special handling when doing |
232 | prologue analysis. */ | |
233 | tdep->plt_entry_size = 16; | |
b2756930 KB |
234 | |
235 | /* Enable TLS support. */ | |
236 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
237 | svr4_fetch_objfile_link_map); | |
0b4294d3 DM |
238 | |
239 | /* Make sure we can single-step over signal return system calls. */ | |
240 | tdep->step_trap = sparc64_linux_step_trap; | |
e8467b5a DM |
241 | |
242 | set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc); | |
386c036b | 243 | } |
70f1dc74 | 244 | \f |
386c036b MK |
245 | |
246 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
247 | extern void _initialize_sparc64_linux_tdep (void); | |
248 | ||
249 | void | |
250 | _initialize_sparc64_linux_tdep (void) | |
251 | { | |
252 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
253 | GDB_OSABI_LINUX, sparc64_linux_init_abi); | |
254 | } |