^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * arch/xtensa/kernel/traps.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Exception handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Derived from code with the following copyrights:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 1994 - 1999 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Modified for R3000 by Paul M. Antoine, 1995, 1996
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Complete output from die() by Ulf Carlsson, 1998
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 1999 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Essentially rewritten for the Xtensa architecture port.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 2001 - 2013 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Chris Zankel <chris@zankel.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Marc Gauthier<marc@tensilica.com, marc@alumni.uwaterloo.ca>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Kevin Chea
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/stringify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/ratelimit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <asm/timex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <asm/hw_breakpoint.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * Machine specific interrupt handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) extern void kernel_exception(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) extern void user_exception(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) extern void fast_illegal_instruction_user(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) extern void fast_syscall_user(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) extern void fast_alloca(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) extern void fast_unaligned(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) extern void fast_second_level_miss(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) extern void fast_store_prohibited(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) extern void fast_coprocessor(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) extern void do_illegal_instruction (struct pt_regs*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) extern void do_interrupt (struct pt_regs*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) extern void do_nmi(struct pt_regs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) extern void do_unaligned_user (struct pt_regs*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) extern void do_multihit (struct pt_regs*, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) extern void do_page_fault (struct pt_regs*, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) extern void do_debug (struct pt_regs*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) extern void system_call (struct pt_regs*);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * The vector table must be preceded by a save area (which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * implies it must be in RAM, unless one places RAM immediately
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * before a ROM and puts the vector at the start of the ROM (!))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #define KRNL 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #define USER 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #define COPROCESSOR(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) { EXCCAUSE_COPROCESSOR ## x ## _DISABLED, USER, fast_coprocessor }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) typedef struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int cause;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int fast;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) void* handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) } dispatch_init_table_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static dispatch_init_table_t __initdata dispatch_init_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #ifdef CONFIG_USER_ABI_CALL0_PROBE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) { EXCCAUSE_ILLEGAL_INSTRUCTION, USER, fast_illegal_instruction_user },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) { EXCCAUSE_ILLEGAL_INSTRUCTION, 0, do_illegal_instruction},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) { EXCCAUSE_SYSTEM_CALL, USER, fast_syscall_user },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) { EXCCAUSE_SYSTEM_CALL, 0, system_call },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* EXCCAUSE_INSTRUCTION_FETCH unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* EXCCAUSE_LOAD_STORE_ERROR unhandled*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) { EXCCAUSE_LEVEL1_INTERRUPT, 0, do_interrupt },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) { EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* EXCCAUSE_PRIVILEGED unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #ifdef CONFIG_XTENSA_UNALIGNED_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) { EXCCAUSE_UNALIGNED, USER, fast_unaligned },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) { EXCCAUSE_UNALIGNED, 0, do_unaligned_user },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) { EXCCAUSE_UNALIGNED, KRNL, fast_unaligned },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) { EXCCAUSE_ITLB_MISS, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) { EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) { EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) { EXCCAUSE_ITLB_PRIVILEGE, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* EXCCAUSE_SIZE_RESTRICTION unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) { EXCCAUSE_FETCH_CACHE_ATTRIBUTE, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) { EXCCAUSE_DTLB_MISS, USER|KRNL, fast_second_level_miss},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) { EXCCAUSE_DTLB_MISS, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) { EXCCAUSE_DTLB_MULTIHIT, 0, do_multihit },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) { EXCCAUSE_DTLB_PRIVILEGE, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* EXCCAUSE_DTLB_SIZE_RESTRICTION unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) { EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) { EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) { EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #endif /* CONFIG_MMU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #if XTENSA_HAVE_COPROCESSOR(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) COPROCESSOR(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #if XTENSA_HAVE_COPROCESSOR(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) COPROCESSOR(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #if XTENSA_HAVE_COPROCESSOR(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) COPROCESSOR(2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #if XTENSA_HAVE_COPROCESSOR(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) COPROCESSOR(3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #if XTENSA_HAVE_COPROCESSOR(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) COPROCESSOR(4),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #if XTENSA_HAVE_COPROCESSOR(5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) COPROCESSOR(5),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #if XTENSA_HAVE_COPROCESSOR(6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) COPROCESSOR(6),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #if XTENSA_HAVE_COPROCESSOR(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) COPROCESSOR(7),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #if XTENSA_FAKE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) { EXCCAUSE_MAPPED_NMI, 0, do_nmi },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) { EXCCAUSE_MAPPED_DEBUG, 0, do_debug },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) { -1, -1, 0 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* The exception table <exc_table> serves two functions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * 1. it contains three dispatch tables (fast_user, fast_kernel, default-c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * 2. it is a temporary memory buffer for the exception handlers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) DEFINE_PER_CPU(struct exc_table, exc_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) DEFINE_PER_CPU(struct debug_table, debug_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void die(const char*, struct pt_regs*, long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) __die_if_kernel(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) die(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Unhandled Exceptions. Kill user task or panic if in kernel space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) void do_unhandled(struct pt_regs *regs, unsigned long exccause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) __die_if_kernel("Caught unhandled exception - should not happen",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) regs, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /* If in user mode, send SIGILL signal to current process */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) pr_info_ratelimited("Caught unhandled exception in '%s' "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) "(pid = %d, pc = %#010lx) - should not happen\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) "\tEXCCAUSE is %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) current->comm, task_pid_nr(current), regs->pc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) exccause);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) force_sig(SIGILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * Multi-hit exception. This if fatal!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) void do_multihit(struct pt_regs *regs, unsigned long exccause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) die("Caught multihit exception", regs, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * IRQ handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) extern void do_IRQ(int, struct pt_regs *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) #if XTENSA_FAKE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #define IS_POW2(v) (((v) & ((v) - 1)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #if !(PROFILING_INTLEVEL == XCHAL_EXCM_LEVEL && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) IS_POW2(XTENSA_INTLEVEL_MASK(PROFILING_INTLEVEL)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) #warning "Fake NMI is requested for PMM, but there are other IRQs at or above its level."
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) #warning "Fake NMI will be used, but there will be a bugcheck if one of those IRQs fire."
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static inline void check_valid_nmi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) unsigned intread = xtensa_get_sr(interrupt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned intenable = xtensa_get_sr(intenable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) BUG_ON(intread & intenable &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ~(XTENSA_INTLEVEL_ANDBELOW_MASK(PROFILING_INTLEVEL) ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) XTENSA_INTLEVEL_MASK(PROFILING_INTLEVEL) ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) BIT(XCHAL_PROFILING_INTERRUPT)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static inline void check_valid_nmi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) irqreturn_t xtensa_pmu_irq_handler(int irq, void *dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) DEFINE_PER_CPU(unsigned long, nmi_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) void do_nmi(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct pt_regs *old_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if ((regs->ps & PS_INTLEVEL_MASK) < LOCKLEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) trace_hardirqs_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) nmi_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) ++*this_cpu_ptr(&nmi_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) check_valid_nmi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) xtensa_pmu_irq_handler(0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) nmi_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) void do_interrupt(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static const unsigned int_level_mask[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) XCHAL_INTLEVEL1_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) XCHAL_INTLEVEL2_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) XCHAL_INTLEVEL3_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) XCHAL_INTLEVEL4_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) XCHAL_INTLEVEL5_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) XCHAL_INTLEVEL6_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) XCHAL_INTLEVEL7_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct pt_regs *old_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) trace_hardirqs_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) old_regs = set_irq_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) unsigned intread = xtensa_get_sr(interrupt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) unsigned intenable = xtensa_get_sr(intenable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) unsigned int_at_level = intread & intenable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) unsigned level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) for (level = LOCKLEVEL; level > 0; --level) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (int_at_level & int_level_mask[level]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) int_at_level &= int_level_mask[level];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (level == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) do_IRQ(__ffs(int_at_level), regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) set_irq_regs(old_regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * Illegal instruction. Fatal if in kernel space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) do_illegal_instruction(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) __die_if_kernel("Illegal instruction in kernel", regs, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* If in user mode, send SIGILL signal to current process. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) pr_info_ratelimited("Illegal Instruction in '%s' (pid = %d, pc = %#010lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) current->comm, task_pid_nr(current), regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) force_sig(SIGILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * Handle unaligned memory accesses from user space. Kill task.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * If CONFIG_UNALIGNED_USER is not set, we don't allow unaligned memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * accesses causes from user space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) #if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) do_unaligned_user (struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) __die_if_kernel("Unhandled unaligned exception in kernel",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) regs, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) current->thread.bad_vaddr = regs->excvaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) current->thread.error_code = -3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) pr_info_ratelimited("Unaligned memory access to %08lx in '%s' "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) "(pid = %d, pc = %#010lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) regs->excvaddr, current->comm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) task_pid_nr(current), regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) force_sig_fault(SIGBUS, BUS_ADRALN, (void *) regs->excvaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* Handle debug events.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * When CONFIG_HAVE_HW_BREAKPOINT is on this handler is called with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * preemption disabled to avoid rescheduling and keep mapping of hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * breakpoint structures to debug registers intact, so that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * DEBUGCAUSE.DBNUM could be used in case of data breakpoint hit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) do_debug(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) #ifdef CONFIG_HAVE_HW_BREAKPOINT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) int ret = check_hw_breakpoint(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) __die_if_kernel("Breakpoint in kernel", regs, SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* If in user mode, send SIGTRAP signal to current process */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) force_sig(SIGTRAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) #define set_handler(type, cause, handler) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) unsigned int cpu; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) for_each_possible_cpu(cpu) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) per_cpu(exc_table, cpu).type[cause] = (handler);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /* Set exception C handler - for temporary use when probing exceptions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) void * __init trap_set_handler(int cause, void *handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) void *previous = per_cpu(exc_table, 0).default_handler[cause];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) set_handler(default_handler, cause, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return previous;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) static void trap_init_excsave(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) unsigned long excsave1 = (unsigned long)this_cpu_ptr(&exc_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) __asm__ __volatile__("wsr %0, excsave1\n" : : "a" (excsave1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static void trap_init_debug(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) unsigned long debugsave = (unsigned long)this_cpu_ptr(&debug_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) this_cpu_ptr(&debug_table)->debug_exception = debug_exception;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) __asm__ __volatile__("wsr %0, excsave" __stringify(XCHAL_DEBUGLEVEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) :: "a"(debugsave));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * Initialize dispatch tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * The exception vectors are stored compressed the __init section in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * dispatch_init_table. This function initializes the following three tables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * from that compressed table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * - fast user first dispatch table for user exceptions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * - fast kernel first dispatch table for kernel exceptions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * - default C-handler C-handler called by the default fast handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * See vectors.S for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) void __init trap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* Setup default vectors. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) for (i = 0; i < EXCCAUSE_N; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) set_handler(fast_user_handler, i, user_exception);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) set_handler(fast_kernel_handler, i, kernel_exception);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) set_handler(default_handler, i, do_unhandled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) /* Setup specific handlers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) for(i = 0; dispatch_init_table[i].cause >= 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) int fast = dispatch_init_table[i].fast;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) int cause = dispatch_init_table[i].cause;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) void *handler = dispatch_init_table[i].handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (fast == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) set_handler(default_handler, cause, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if ((fast & USER) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) set_handler(fast_user_handler, cause, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if ((fast & KRNL) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) set_handler(fast_kernel_handler, cause, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) /* Initialize EXCSAVE_1 to hold the address of the exception table. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) trap_init_excsave();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) trap_init_debug();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) void secondary_trap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) trap_init_excsave();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) trap_init_debug();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * This function dumps the current valid window frame and other base registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) void show_regs(struct pt_regs * regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int i, wmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) show_regs_print_info(KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) wmask = regs->wmask & ~1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) for (i = 0; i < 16; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if ((i % 8) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) pr_info("a%02d:", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) pr_cont(" %08lx", regs->areg[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) pr_cont("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) pr_info("pc: %08lx, ps: %08lx, depc: %08lx, excvaddr: %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) regs->pc, regs->ps, regs->depc, regs->excvaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) pr_info("lbeg: %08lx, lend: %08lx lcount: %08lx, sar: %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) regs->lbeg, regs->lend, regs->lcount, regs->sar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) pr_cont("wb: %08lx, ws: %08lx, wmask: %08lx, syscall: %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) regs->windowbase, regs->windowstart, regs->wmask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) regs->syscall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) static int show_trace_cb(struct stackframe *frame, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) const char *loglvl = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (kernel_text_address(frame->pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) printk("%s [<%08lx>] %pB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) loglvl, frame->pc, (void *)frame->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) static void show_trace(struct task_struct *task, unsigned long *sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (!sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) sp = stack_pointer(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) printk("%sCall Trace:\n", loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) walk_stackframe(sp, show_trace_cb, (void *)loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) #define STACK_DUMP_ENTRY_SIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) #define STACK_DUMP_LINE_SIZE 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) static size_t kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (!sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) sp = stack_pointer(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) printk("%sStack:\n", loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) print_hex_dump(loglvl, " ", DUMP_PREFIX_NONE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) sp, len, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) show_trace(task, sp, loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) DEFINE_SPINLOCK(die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) void die(const char * str, struct pt_regs * regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) static int die_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) const char *pr = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) if (IS_ENABLED(CONFIG_PREEMPTION))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) console_verbose();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) spin_lock_irq(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) pr_info("%s: sig: %ld [#%d]%s\n", str, err, ++die_counter, pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) show_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) show_stack(NULL, (unsigned long *)regs->areg[1], KERN_INFO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) spin_unlock_irq(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (in_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) panic("Fatal exception in interrupt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (panic_on_oops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) panic("Fatal exception");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) do_exit(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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