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2d1c1221 ME |
1 | /* Target-dependent code for Xilinx MicroBlaze. |
2 | ||
3 | Copyright 2009 Free Software Foundation, Inc. | |
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 3 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, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "symtab.h" | |
24 | #include "target.h" | |
25 | #include "gdbcore.h" | |
26 | #include "gdbcmd.h" | |
27 | #include "symfile.h" | |
28 | #include "objfiles.h" | |
29 | #include "regcache.h" | |
30 | #include "value.h" | |
31 | #include "osabi.h" | |
32 | #include "regset.h" | |
33 | #include "solib-svr4.h" | |
34 | #include "microblaze-tdep.h" | |
35 | #include "trad-frame.h" | |
36 | #include "frame-unwind.h" | |
37 | #include "tramp-frame.h" | |
38 | ||
39 | ||
40 | static int | |
41 | microblaze_linux_memory_remove_breakpoint (struct bp_target_info *bp_tgt) | |
42 | { | |
43 | CORE_ADDR addr = bp_tgt->placed_address; | |
44 | const gdb_byte *bp; | |
45 | int val; | |
46 | int bplen; | |
47 | gdb_byte old_contents[BREAKPOINT_MAX]; | |
48 | ||
49 | /* Determine appropriate breakpoint contents and size for this address. */ | |
50 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); | |
51 | if (bp == NULL) | |
52 | error (_("Software breakpoints not implemented for this target.")); | |
53 | ||
54 | val = target_read_memory (addr, old_contents, bplen); | |
55 | ||
56 | /* If our breakpoint is no longer at the address, this means that the | |
57 | program modified the code on us, so it is wrong to put back the | |
58 | old value. */ | |
59 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) | |
60 | val = target_write_memory (addr, bp_tgt->shadow_contents, bplen); | |
61 | ||
62 | return val; | |
63 | } | |
64 | ||
65 | static void | |
66 | microblaze_linux_sigtramp_cache (struct frame_info *next_frame, | |
67 | struct trad_frame_cache *this_cache, | |
68 | CORE_ADDR func, LONGEST offset, | |
69 | int bias) | |
70 | { | |
71 | CORE_ADDR base; | |
72 | CORE_ADDR gpregs; | |
73 | int regnum; | |
74 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
75 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
76 | ||
77 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); | |
78 | if (bias > 0 && frame_pc_unwind (next_frame) != func) | |
79 | /* See below, some signal trampolines increment the stack as their | |
80 | first instruction, need to compensate for that. */ | |
81 | base -= bias; | |
82 | ||
83 | /* Find the address of the register buffer. */ | |
84 | gpregs = base + offset; | |
85 | ||
86 | /* Registers saved on stack. */ | |
87 | for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++) | |
88 | trad_frame_set_reg_addr (this_cache, regnum, | |
89 | gpregs + regnum * MICROBLAZE_REGISTER_SIZE); | |
90 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
91 | } | |
92 | ||
93 | ||
94 | static void | |
95 | microblaze_linux_sighandler_cache_init (const struct tramp_frame *self, | |
96 | struct frame_info *next_frame, | |
97 | struct trad_frame_cache *this_cache, | |
98 | CORE_ADDR func) | |
99 | { | |
100 | microblaze_linux_sigtramp_cache (next_frame, this_cache, func, | |
101 | 0 /* Offset to ucontext_t. */ | |
102 | + 24 /* Offset to .reg. */, | |
103 | 0); | |
104 | } | |
105 | ||
106 | static struct tramp_frame microblaze_linux_sighandler_tramp_frame = | |
107 | { | |
108 | SIGTRAMP_FRAME, | |
109 | 4, | |
110 | { | |
111 | { 0x31800077, -1 }, /* addik R12,R0,119. */ | |
112 | { 0xb9cc0008, -1 }, /* brki R14,8. */ | |
113 | { TRAMP_SENTINEL_INSN }, | |
114 | }, | |
115 | microblaze_linux_sighandler_cache_init | |
116 | }; | |
117 | ||
118 | ||
119 | static void | |
120 | microblaze_linux_init_abi (struct gdbarch_info info, | |
121 | struct gdbarch *gdbarch) | |
122 | { | |
123 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
124 | ||
125 | set_gdbarch_memory_remove_breakpoint (gdbarch, | |
126 | microblaze_linux_memory_remove_breakpoint); | |
127 | ||
128 | /* Shared library handling. */ | |
129 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
130 | svr4_ilp32_fetch_link_map_offsets); | |
131 | ||
132 | /* Trampolines. */ | |
133 | tramp_frame_prepend_unwinder (gdbarch, | |
134 | µblaze_linux_sighandler_tramp_frame); | |
135 | } | |
136 | ||
137 | void | |
138 | _initialize_microblaze_linux_tdep (void) | |
139 | { | |
140 | gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, | |
141 | microblaze_linux_init_abi); | |
142 | } |