1 /*
2 * Copyright (c) 2016 Cadence Design Systems, Inc.
3 * SPDX-License-Identifier: Apache-2.0
4 */
5
6 #include <zephyr/kernel.h>
7 #include <zephyr/arch/cpu.h>
8 #include <zephyr/kernel_structs.h>
9 #include <inttypes.h>
10 #include <xtensa/config/specreg.h>
11 #include <xtensa-asm2-context.h>
12 #if defined(CONFIG_XTENSA_ENABLE_BACKTRACE)
13 #if XCHAL_HAVE_WINDOWED
14 #include <xtensa_backtrace.h>
15 #endif
16 #endif
17 #include <zephyr/debug/coredump.h>
18 #include <zephyr/logging/log.h>
19 LOG_MODULE_DECLARE(os, CONFIG_KERNEL_LOG_LEVEL);
20
21 #ifdef XT_SIMULATOR
22 #include <xtensa/simcall.h>
23 #endif
24
25 /* Need to do this as a macro since regnum must be an immediate value */
26 #define get_sreg(regnum_p) ({ \
27 unsigned int retval; \
28 __asm__ volatile( \
29 "rsr %[retval], %[regnum]\n\t" \
30 : [retval] "=r" (retval) \
31 : [regnum] "i" (regnum_p)); \
32 retval; \
33 })
34
35
z_xtensa_exccause(unsigned int cause_code)36 char *z_xtensa_exccause(unsigned int cause_code)
37 {
38 #if defined(CONFIG_PRINTK) || defined(CONFIG_LOG)
39 switch (cause_code) {
40 case 0:
41 return "illegal instruction";
42 case 1:
43 return "syscall";
44 case 2:
45 return "instr fetch error";
46 case 3:
47 return "load/store error";
48 case 4:
49 return "level-1 interrupt";
50 case 5:
51 return "alloca";
52 case 6:
53 return "divide by zero";
54 case 8:
55 return "privileged";
56 case 9:
57 return "load/store alignment";
58 case 12:
59 return "instr PIF data error";
60 case 13:
61 return "load/store PIF data error";
62 case 14:
63 return "instr PIF addr error";
64 case 15:
65 return "load/store PIF addr error";
66 case 16:
67 return "instr TLB miss";
68 case 17:
69 return "instr TLB multi hit";
70 case 18:
71 return "instr fetch privilege";
72 case 20:
73 return "inst fetch prohibited";
74 case 24:
75 return "load/store TLB miss";
76 case 25:
77 return "load/store TLB multi hit";
78 case 26:
79 return "load/store privilege";
80 case 28:
81 return "load prohibited";
82 case 29:
83 return "store prohibited";
84 case 32: case 33: case 34: case 35: case 36: case 37: case 38: case 39:
85 return "coprocessor disabled";
86 case 63:
87 /* i.e. z_except_reason */
88 return "zephyr exception";
89 default:
90 return "unknown/reserved";
91 }
92 #else
93 ARG_UNUSED(cause_code);
94 return "na";
95 #endif
96 }
97
z_xtensa_fatal_error(unsigned int reason,const z_arch_esf_t * esf)98 void z_xtensa_fatal_error(unsigned int reason, const z_arch_esf_t *esf)
99 {
100 if (esf) {
101 /* Don't want to get elbowed by xtensa_switch
102 * in between printing registers and dumping them;
103 * corrupts backtrace
104 */
105 unsigned int key = arch_irq_lock();
106
107 z_xtensa_dump_stack(esf);
108
109 coredump(reason, esf, IS_ENABLED(CONFIG_MULTITHREADING) ? k_current_get() : NULL);
110
111 #if defined(CONFIG_XTENSA_ENABLE_BACKTRACE)
112 #if XCHAL_HAVE_WINDOWED
113 z_xtensa_backtrace_print(100, (int *)esf);
114 #endif
115 #endif
116
117 arch_irq_unlock(key);
118 }
119
120 z_fatal_error(reason, esf);
121 }
122
123 #ifdef XT_SIMULATOR
exit(int return_code)124 void exit(int return_code)
125 {
126 __asm__ (
127 "mov a3, %[code]\n\t"
128 "movi a2, %[call]\n\t"
129 "simcall\n\t"
130 :
131 : [code] "r" (return_code), [call] "i" (SYS_exit)
132 : "a3", "a2");
133 }
134 #endif
135
136 #ifdef XT_SIMULATOR
z_system_halt(unsigned int reason)137 FUNC_NORETURN void z_system_halt(unsigned int reason)
138 {
139 exit(255 - reason);
140 CODE_UNREACHABLE;
141 }
142 #endif
143
