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4cd0bc3b | 1 | /* DWARF2 EH unwinding support for C-SKY Linux. |
7adcbafe | 2 | Copyright (C) 2018-2022 Free Software Foundation, Inc. |
4cd0bc3b J |
3 | Contributed by C-SKY Microsystems and Mentor Graphics. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC 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, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GCC 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 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | #ifndef inhibit_libc | |
27 | ||
28209372 XQ |
28 | /* Do code reading to identify a signal frame, and set the frame state data |
29 | appropriately. See unwind-dw2.c for the structs. */ | |
4cd0bc3b J |
30 | |
31 | #include <signal.h> | |
32 | #include <asm/unistd.h> | |
33 | ||
b2a71af6 XQ |
34 | #define TRAP0_V1 0x0008 |
35 | #define MOVI_R1_119_V1 (0x6000 + (119 << 4) + 1) | |
36 | #define MOVI_R1_127_V1 (0x6000 + (127 << 4) + 1) | |
37 | #define ADDI_R1_32_V1 (0x2000 + (31 << 4) + 1) | |
38 | #define ADDI_R1_14_V1 (0x2000 + (13 << 4) + 1) | |
39 | #define ADDI_R1_12_V1 (0x2000 + (11 << 4) + 1) | |
40 | ||
41 | #define TRAP0_V2_PART0 0xc000 | |
42 | #define TRAP0_V2_PART1 0x2020 | |
43 | #define MOVI_R7_119_V2_PART0 0xea07 | |
44 | #define MOVI_R7_119_V2_PART1 119 | |
45 | #define MOVI_R7_173_V2_PART0 0xea07 | |
46 | #define MOVI_R7_173_V2_PART1 173 | |
47 | #define MOVI_R7_139_V2_PART0 0xea07 | |
48 | #define MOVI_R7_139_V2_PART1 139 | |
49 | ||
ff641ae1 XQ |
50 | #define sc_pt_regs(x) (sc->sc_pt_regs.x) |
51 | #define sc_pt_regs_lr (sc->sc_pt_regs.lr) | |
52 | #define sc_pt_regs_tls(x) sc_pt_regs(x) | |
4cd0bc3b J |
53 | |
54 | #define MD_FALLBACK_FRAME_STATE_FOR csky_fallback_frame_state | |
55 | ||
56 | static _Unwind_Reason_Code | |
57 | csky_fallback_frame_state (struct _Unwind_Context *context, | |
58 | _Unwind_FrameState *fs) | |
59 | { | |
60 | u_int16_t *pc = (u_int16_t *) context->ra; | |
61 | struct sigcontext *sc; | |
62 | _Unwind_Ptr new_cfa; | |
63 | int i; | |
64 | ||
65 | /* movi r7, __NR_rt_sigreturn; trap 0 */ | |
b2a71af6 XQ |
66 | if ((*(pc + 0) == MOVI_R7_139_V2_PART0) |
67 | && (*(pc + 1) == MOVI_R7_139_V2_PART1) && (*(pc + 2) == TRAP0_V2_PART0) | |
68 | && (*(pc + 3) == TRAP0_V2_PART1)) | |
4cd0bc3b | 69 | { |
b2a71af6 XQ |
70 | struct rt_sigframe |
71 | { | |
72 | int sig; | |
73 | struct siginfo *pinfo; | |
74 | void *puc; | |
75 | siginfo_t info; | |
76 | ucontext_t uc; | |
77 | } *_rt = context->cfa; | |
78 | sc = &(_rt->uc.uc_mcontext); | |
79 | } | |
4cd0bc3b J |
80 | else |
81 | return _URC_END_OF_STACK; | |
82 | ||
b2a71af6 | 83 | new_cfa = (_Unwind_Ptr) sc_pt_regs (usp); |
4cd0bc3b J |
84 | fs->regs.cfa_how = CFA_REG_OFFSET; |
85 | fs->regs.cfa_reg = STACK_POINTER_REGNUM; | |
86 | fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa; | |
87 | ||
146e4591 | 88 | fs->regs.how[0] = REG_SAVED_OFFSET; |
b2a71af6 | 89 | fs->regs.reg[0].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a0) - new_cfa; |
4cd0bc3b | 90 | |
146e4591 | 91 | fs->regs.how[1] = REG_SAVED_OFFSET; |
b2a71af6 | 92 | fs->regs.reg[1].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a1) - new_cfa; |
4cd0bc3b | 93 | |
146e4591 | 94 | fs->regs.how[2] = REG_SAVED_OFFSET; |
b2a71af6 | 95 | fs->regs.reg[2].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a2) - new_cfa; |
4cd0bc3b | 96 | |
146e4591 | 97 | fs->regs.how[3] = REG_SAVED_OFFSET; |
b2a71af6 | 98 | fs->regs.reg[3].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a3) - new_cfa; |
4cd0bc3b J |
99 | |
100 | for (i = 4; i < 14; i++) | |
101 | { | |
146e4591 | 102 | fs->regs.how[i] = REG_SAVED_OFFSET; |
b2a71af6 XQ |
103 | fs->regs.reg[i].loc.offset = |
104 | (_Unwind_Ptr) & sc_pt_regs (regs[i - 4]) - new_cfa; | |
4cd0bc3b J |
105 | } |
106 | ||
b2a71af6 | 107 | for (i = 16; i < 31; i++) |
4cd0bc3b | 108 | { |
146e4591 | 109 | fs->regs.how[i] = REG_SAVED_OFFSET; |
b2a71af6 XQ |
110 | fs->regs.reg[i].loc.offset = |
111 | (_Unwind_Ptr) & sc_pt_regs (exregs[i - 16]) - new_cfa; | |
4cd0bc3b J |
112 | } |
113 | ||
b2a71af6 XQ |
114 | fs->regs.reg[31].loc.offset = |
115 | (_Unwind_Ptr) & sc_pt_regs_tls (tls) - new_cfa; | |
4cd0bc3b | 116 | /* FIXME : hi lo ? */ |
146e4591 | 117 | fs->regs.how[15] = REG_SAVED_OFFSET; |
b2a71af6 | 118 | fs->regs.reg[15].loc.offset = (_Unwind_Ptr) & sc_pt_regs_lr - new_cfa; |
4cd0bc3b | 119 | |
146e4591 | 120 | fs->regs.how[32] = REG_SAVED_OFFSET; |
b2a71af6 XQ |
121 | fs->regs.reg[32].loc.offset = (_Unwind_Ptr) & sc_pt_regs (pc) - new_cfa; |
122 | fs->retaddr_column = 32; | |
4cd0bc3b J |
123 | fs->signal_frame = 1; |
124 | ||
125 | return _URC_NO_REASON; | |
126 | } | |
127 | ||
4cd0bc3b | 128 | #endif |