diff options
Diffstat (limited to 'meta/recipes-devtools/gdb/gdb/0013-arc-Add-support-for-signal-frames-for-Linux-targets.patch')
-rw-r--r-- | meta/recipes-devtools/gdb/gdb/0013-arc-Add-support-for-signal-frames-for-Linux-targets.patch | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/meta/recipes-devtools/gdb/gdb/0013-arc-Add-support-for-signal-frames-for-Linux-targets.patch b/meta/recipes-devtools/gdb/gdb/0013-arc-Add-support-for-signal-frames-for-Linux-targets.patch new file mode 100644 index 0000000000..f699a5888d --- /dev/null +++ b/meta/recipes-devtools/gdb/gdb/0013-arc-Add-support-for-signal-frames-for-Linux-targets.patch | |||
@@ -0,0 +1,232 @@ | |||
1 | From 16ddc17b4f403a38701e0108b02aff967900cc66 Mon Sep 17 00:00:00 2001 | ||
2 | From: Anton Kolesov <Anton.Kolesov@synopsys.com> | ||
3 | Date: Thu, 22 Dec 2016 21:52:16 +0300 | ||
4 | Subject: [PATCH 2/4] arc: Add support for signal frames for Linux targets | ||
5 | |||
6 | Implement functions needed to unwind signal frames on ARC Linux targets. | ||
7 | |||
8 | gdb/ChangeLog | ||
9 | |||
10 | * arc-linux-tdep.c (arc_linux_sc_reg_offsets): New static variable. | ||
11 | (arc_linux_is_sigtramp): New function. | ||
12 | (arc_linux_sigcontext_addr): Likewise. | ||
13 | (arc_linux_init_osabi): Use them. | ||
14 | |||
15 | Upstream-Status: Backport [https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d4af727286e3a9f177ba11677fbd3a012d36558a] | ||
16 | |||
17 | Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com> | ||
18 | Signed-off-by: Shahab Vahedi <shahab@synopsys.com> | ||
19 | Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> | ||
20 | --- | ||
21 | gdb/arc-linux-tdep.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
22 | 1 file changed, 181 insertions(+) | ||
23 | |||
24 | diff --git a/gdb/arc-linux-tdep.c b/gdb/arc-linux-tdep.c | ||
25 | index a7bace12623..17bb3e7b276 100644 | ||
26 | --- a/gdb/arc-linux-tdep.c | ||
27 | +++ b/gdb/arc-linux-tdep.c | ||
28 | @@ -33,6 +33,60 @@ | ||
29 | |||
30 | #define REGOFF(offset) (offset * ARC_REGISTER_SIZE) | ||
31 | |||
32 | +/* arc_linux_sc_reg_offsets[i] is the offset of register i in the `struct | ||
33 | + sigcontext'. Array index is an internal GDB register number, as defined in | ||
34 | + arc-tdep.h:arc_regnum. | ||
35 | + | ||
36 | + From <include/uapi/asm/sigcontext.h> and <include/uapi/asm/ptrace.h>. | ||
37 | + | ||
38 | + The layout of this struct is tightly bound to "arc_regnum" enum | ||
39 | + in arc-tdep.h. Any change of order in there, must be reflected | ||
40 | + here as well. */ | ||
41 | +static const int arc_linux_sc_reg_offsets[] = { | ||
42 | + /* R0 - R12. */ | ||
43 | + REGOFF (22), REGOFF (21), REGOFF (20), REGOFF (19), | ||
44 | + REGOFF (18), REGOFF (17), REGOFF (16), REGOFF (15), | ||
45 | + REGOFF (14), REGOFF (13), REGOFF (12), REGOFF (11), | ||
46 | + REGOFF (10), | ||
47 | + | ||
48 | + /* R13 - R25. */ | ||
49 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
50 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
51 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
52 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
53 | + ARC_OFFSET_NO_REGISTER, | ||
54 | + | ||
55 | + REGOFF (9), /* R26 (GP) */ | ||
56 | + REGOFF (8), /* FP */ | ||
57 | + REGOFF (23), /* SP */ | ||
58 | + ARC_OFFSET_NO_REGISTER, /* ILINK */ | ||
59 | + ARC_OFFSET_NO_REGISTER, /* R30 */ | ||
60 | + REGOFF (7), /* BLINK */ | ||
61 | + | ||
62 | + /* R32 - R59. */ | ||
63 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
64 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
65 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
66 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
67 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
68 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
69 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
70 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
71 | + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, | ||
72 | + ARC_OFFSET_NO_REGISTER, | ||
73 | + | ||
74 | + REGOFF (4), /* LP_COUNT */ | ||
75 | + ARC_OFFSET_NO_REGISTER, /* RESERVED */ | ||
76 | + ARC_OFFSET_NO_REGISTER, /* LIMM */ | ||
77 | + ARC_OFFSET_NO_REGISTER, /* PCL */ | ||
78 | + | ||
79 | + REGOFF (6), /* PC */ | ||
80 | + REGOFF (5), /* STATUS32 */ | ||
81 | + REGOFF (2), /* LP_START */ | ||
82 | + REGOFF (3), /* LP_END */ | ||
83 | + REGOFF (1), /* BTA */ | ||
84 | +}; | ||
85 | + | ||
86 | /* arc_linux_core_reg_offsets[i] is the offset in the .reg section of GDB | ||
87 | regnum i. Array index is an internal GDB register number, as defined in | ||
88 | arc-tdep.h:arc_regnum. | ||
89 | @@ -87,6 +141,127 @@ static const int arc_linux_core_reg_offsets[] = { | ||
90 | REGOFF (6) /* ERET */ | ||
91 | }; | ||
92 | |||
93 | +/* Is THIS_FRAME a sigtramp function - the function that returns from | ||
94 | + signal handler into normal execution flow? This is the case if the PC is | ||
95 | + either at the start of, or in the middle of the two instructions: | ||
96 | + | ||
97 | + mov r8, __NR_rt_sigreturn ; __NR_rt_sigreturn == 139 | ||
98 | + trap_s 0 ; `swi' for ARC700 | ||
99 | + | ||
100 | + On ARC uClibc Linux this function is called __default_rt_sa_restorer. | ||
101 | + | ||
102 | + Returns TRUE if this is a sigtramp frame. */ | ||
103 | + | ||
104 | +static bool | ||
105 | +arc_linux_is_sigtramp (struct frame_info *this_frame) | ||
106 | +{ | ||
107 | + struct gdbarch *gdbarch = get_frame_arch (this_frame); | ||
108 | + CORE_ADDR pc = get_frame_pc (this_frame); | ||
109 | + | ||
110 | + if (arc_debug) | ||
111 | + { | ||
112 | + debug_printf ("arc-linux: arc_linux_is_sigtramp, pc=%s\n", | ||
113 | + paddress(gdbarch, pc)); | ||
114 | + } | ||
115 | + | ||
116 | + static const gdb_byte insns_be_hs[] = { | ||
117 | + 0x20, 0x8a, 0x12, 0xc2, /* mov r8,nr_rt_sigreturn */ | ||
118 | + 0x78, 0x1e /* trap_s 0 */ | ||
119 | + }; | ||
120 | + static const gdb_byte insns_be_700[] = { | ||
121 | + 0x20, 0x8a, 0x12, 0xc2, /* mov r8,nr_rt_sigreturn */ | ||
122 | + 0x22, 0x6f, 0x00, 0x3f /* swi */ | ||
123 | + }; | ||
124 | + | ||
125 | + gdb_byte arc_sigtramp_insns[sizeof (insns_be_700)]; | ||
126 | + size_t insns_sz; | ||
127 | + if (arc_mach_is_arcv2 (gdbarch)) | ||
128 | + { | ||
129 | + insns_sz = sizeof (insns_be_hs); | ||
130 | + memcpy (arc_sigtramp_insns, insns_be_hs, insns_sz); | ||
131 | + } | ||
132 | + else | ||
133 | + { | ||
134 | + insns_sz = sizeof (insns_be_700); | ||
135 | + memcpy (arc_sigtramp_insns, insns_be_700, insns_sz); | ||
136 | + } | ||
137 | + if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | ||
138 | + { | ||
139 | + /* On little endian targets, ARC code section is in what is called | ||
140 | + "middle endian", where half-words are in the big-endian order, | ||
141 | + only bytes inside the halfwords are in the little endian order. | ||
142 | + As a result it is very easy to convert big endian instruction to | ||
143 | + little endian, since it is needed to swap bytes in the halfwords, | ||
144 | + so there is no need to have information on whether that is a | ||
145 | + 4-byte instruction or 2-byte. */ | ||
146 | + gdb_assert ((insns_sz % 2) == 0); | ||
147 | + for (int i = 0; i < insns_sz; i += 2) | ||
148 | + std::swap (arc_sigtramp_insns[i], arc_sigtramp_insns[i+1]); | ||
149 | + } | ||
150 | + | ||
151 | + gdb_byte buf[insns_sz]; | ||
152 | + | ||
153 | + /* Read the memory at the PC. Since we are stopped, any breakpoint must | ||
154 | + have been removed. */ | ||
155 | + if (!safe_frame_unwind_memory (this_frame, pc, buf, insns_sz)) | ||
156 | + { | ||
157 | + /* Failed to unwind frame. */ | ||
158 | + return FALSE; | ||
159 | + } | ||
160 | + | ||
161 | + /* Is that code the sigtramp instruction sequence? */ | ||
162 | + if (memcmp (buf, arc_sigtramp_insns, insns_sz) == 0) | ||
163 | + return TRUE; | ||
164 | + | ||
165 | + /* No - look one instruction earlier in the code... */ | ||
166 | + if (!safe_frame_unwind_memory (this_frame, pc - 4, buf, insns_sz)) | ||
167 | + { | ||
168 | + /* Failed to unwind frame. */ | ||
169 | + return FALSE; | ||
170 | + } | ||
171 | + | ||
172 | + return (memcmp (buf, arc_sigtramp_insns, insns_sz) == 0); | ||
173 | +} | ||
174 | + | ||
175 | +/* Get sigcontext structure of sigtramp frame - it contains saved | ||
176 | + registers of interrupted frame. | ||
177 | + | ||
178 | + Stack pointer points to the rt_sigframe structure, and sigcontext can | ||
179 | + be found as in: | ||
180 | + | ||
181 | + struct rt_sigframe { | ||
182 | + struct siginfo info; | ||
183 | + struct ucontext uc; | ||
184 | + ... | ||
185 | + }; | ||
186 | + | ||
187 | + struct ucontext { | ||
188 | + unsigned long uc_flags; | ||
189 | + struct ucontext *uc_link; | ||
190 | + stack_t uc_stack; | ||
191 | + struct sigcontext uc_mcontext; | ||
192 | + sigset_t uc_sigmask; | ||
193 | + }; | ||
194 | + | ||
195 | + sizeof (struct siginfo) == 0x80 | ||
196 | + offsetof (struct ucontext, uc_mcontext) == 0x14 | ||
197 | + | ||
198 | + GDB cannot include linux headers and use offsetof () because those are | ||
199 | + target headers and GDB might be built for a different run host. There | ||
200 | + doesn't seem to be an established mechanism to figure out those offsets | ||
201 | + via gdbserver, so the only way is to hardcode values in the GDB, | ||
202 | + meaning that GDB will be broken if values will change. That seems to | ||
203 | + be a very unlikely scenario and other arches (aarch64, alpha, amd64, | ||
204 | + etc) in GDB hardcode values. */ | ||
205 | + | ||
206 | +static CORE_ADDR | ||
207 | +arc_linux_sigcontext_addr (struct frame_info *this_frame) | ||
208 | +{ | ||
209 | + const int ucontext_offset = 0x80; | ||
210 | + const int sigcontext_offset = 0x14; | ||
211 | + return get_frame_sp (this_frame) + ucontext_offset + sigcontext_offset; | ||
212 | +} | ||
213 | + | ||
214 | /* Implement the "cannot_fetch_register" gdbarch method. */ | ||
215 | |||
216 | static int | ||
217 | @@ -504,6 +679,12 @@ arc_linux_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) | ||
218 | if (arc_debug) | ||
219 | debug_printf ("arc-linux: GNU/Linux OS/ABI initialization.\n"); | ||
220 | |||
221 | + /* Fill in target-dependent info in ARC-private structure. */ | ||
222 | + tdep->is_sigtramp = arc_linux_is_sigtramp; | ||
223 | + tdep->sigcontext_addr = arc_linux_sigcontext_addr; | ||
224 | + tdep->sc_reg_offset = arc_linux_sc_reg_offsets; | ||
225 | + tdep->sc_num_regs = ARRAY_SIZE (arc_linux_sc_reg_offsets); | ||
226 | + | ||
227 | /* If we are using Linux, we have in uClibc | ||
228 | (libc/sysdeps/linux/arc/bits/setjmp.h): | ||
229 | |||
230 | -- | ||
231 | 2.16.2 | ||
232 | |||