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b0c7ddf8 | 1 | /* DWARF2 EH unwinding support for ARC Linux. |
8d9254fc | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
b0c7ddf8 CM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | and a copy of the GCC Runtime Library Exception along with this | |
22 | program; see the files COPYING3 and COPYING.RUNTIME respectively. | |
23 | If not, see <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | /* This order is defined by a structure in the kernel, in file | |
26 | arch/arc/kernel/signal.c. */ | |
27 | ||
28 | #define REGISTER_IN_STACK(REG_NAME, ID) \ | |
29 | REG_NAME, | |
30 | enum registers_stack_order { | |
31 | REGISTER_STACK_ORDER_START = -1, | |
32 | #include "config/arc/linux-unwind-reg.def" | |
33 | REGISTER_STACK_ORDER_SIZE, | |
34 | }; | |
35 | ||
36 | struct register_position { | |
37 | int reg_id; | |
38 | int offset_in_stack; | |
39 | }; | |
40 | #undef REGISTER_IN_STACK | |
41 | ||
42 | #define REGISTER_SIZE_IN_WORDS 4 | |
43 | #define REGISTER_IN_STACK(REG_NAME, ID) (int) ID, | |
44 | int | |
45 | register_id_for_index[REGISTER_STACK_ORDER_SIZE] = { | |
46 | #include "config/arc/linux-unwind-reg.def" | |
47 | }; | |
48 | #undef REGISTER_IN_STACK | |
49 | ||
50 | #ifndef inhibit_libc | |
51 | /* Do code reading to identify a signal frame, and set the frame | |
52 | state data appropriately. See unwind-dw2.c for the structs. */ | |
53 | ||
54 | #include <signal.h> | |
55 | #include <asm/unistd.h> | |
56 | ||
57 | /* | |
58 | 00010edc <__default_rt_sa_restorer>: | |
59 | 10edc: 208a 12c2 mov r8,139 | |
60 | 10ee0: 781e trap_s 0 | |
61 | 10ee2: 7ee0 j_s [blink] | |
62 | */ | |
63 | ||
64 | #if __BIG_ENDIAN__ | |
65 | #define MOV_R8_139 0x8a20c212 | |
66 | #define TRAP_S_J_S_BLINK 0x1e78e07e | |
67 | #define SWI 0x6f223f00 | |
68 | #elif __LITTLE_ENDIAN__ | |
69 | #define MOV_R8_139 0x12c2208a | |
70 | #define TRAP_S_J_S_BLINK 0x7ee0781e | |
71 | #define SWI 0x003f226f | |
72 | #endif | |
73 | ||
74 | #define MD_FALLBACK_FRAME_STATE_FOR arc_fallback_frame_state | |
75 | ||
76 | static __attribute__((noinline)) _Unwind_Reason_Code | |
77 | arc_fallback_frame_state (struct _Unwind_Context *context, | |
78 | _Unwind_FrameState *fs) | |
79 | { | |
80 | struct rt_sigframe { | |
81 | siginfo_t info; | |
82 | ucontext_t uc; | |
83 | unsigned int sigret_magic; | |
84 | }; | |
85 | ||
86 | struct rt_sigframe *rt_; | |
87 | u_int32_t *pc = (u_int32_t *) context->ra; | |
88 | struct sigcontext *sc; | |
89 | _Unwind_Ptr new_cfa; | |
90 | int i; | |
91 | ||
92 | #ifdef __ARC700__ | |
93 | if (pc[1] != SWI) | |
94 | return _URC_END_OF_STACK; | |
95 | #else | |
96 | if (pc[1] != TRAP_S_J_S_BLINK) | |
97 | return _URC_END_OF_STACK; | |
98 | #endif | |
99 | ||
100 | if (pc[0] == MOV_R8_139) | |
101 | { | |
102 | rt_ = context->cfa; | |
103 | sc = &rt_->uc.uc_mcontext; | |
104 | } | |
105 | else | |
106 | return _URC_END_OF_STACK; | |
107 | ||
108 | new_cfa = (_Unwind_Ptr) sc; | |
109 | fs->regs.cfa_how = CFA_REG_OFFSET; | |
110 | fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__; | |
111 | fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa; | |
112 | ||
113 | unsigned long *regs = &sc->regs.scratch.bta; | |
114 | for (i = 0; i < REGISTER_STACK_ORDER_SIZE; i++) | |
115 | { | |
116 | if (register_id_for_index[i] == -1) | |
117 | continue; | |
118 | fs->regs.reg[register_id_for_index[i]].how = REG_SAVED_OFFSET; | |
119 | fs->regs.reg[register_id_for_index[i]].loc.offset | |
120 | = ((_Unwind_Ptr) &(regs[i])) - new_cfa; | |
121 | } | |
122 | ||
123 | fs->regs.reg[31].how = REG_SAVED_VAL_OFFSET; | |
124 | fs->regs.reg[31].loc.offset = ((_Unwind_Ptr) (regs[ret])) - new_cfa; | |
125 | ||
126 | fs->retaddr_column = 31; | |
127 | ||
128 | return _URC_NO_REASON; | |
129 | } | |
130 | #endif | |
131 | ||
132 | #define MD_FROB_UPDATE_CONTEXT arc_frob_update_context | |
133 | /* Save fp register for unwinding to work. */ | |
134 | ||
135 | static void | |
136 | arc_frob_update_context (struct _Unwind_Context *context, | |
137 | _Unwind_FrameState *fs) | |
138 | { | |
139 | _Unwind_Word fp_val; | |
140 | asm ("mov %0,fp" : "=r" (fp_val)); | |
141 | ||
142 | switch (fs->regs.reg[27].how) | |
143 | { | |
144 | case REG_UNSAVED: | |
145 | case REG_UNDEFINED: | |
146 | if (context->reg[27] == NULL) | |
147 | _Unwind_SetGRValue (context, 27, fp_val); | |
148 | break; | |
149 | ||
150 | default: | |
151 | break; | |
152 | } | |
153 | } |