^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * arch/arm/kernel/unwind.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 ARM Limited
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Stack unwinding support for ARM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * An ARM EABI version of gcc is required to generate the unwind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * tables. For information about the structure of the unwind tables,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * see "Exception Handling ABI for the ARM Architecture" at:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #ifndef __CHECKER__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #if !defined (__ARM_EABI__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #warning Your compiler does not have EABI support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #warning ARM unwind is known to compile only with EABI compilers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #warning Change compiler or disable ARM_UNWIND option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2) && !defined(__clang__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #warning Your compiler is too buggy; it is known to not compile ARM unwind support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #warning Change compiler or disable ARM_UNWIND option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif /* __CHECKER__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/unwind.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /* Dummy functions to avoid linker complaints */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void __aeabi_unwind_cpp_pr0(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) EXPORT_SYMBOL(__aeabi_unwind_cpp_pr0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void __aeabi_unwind_cpp_pr1(void)
^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) EXPORT_SYMBOL(__aeabi_unwind_cpp_pr1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) void __aeabi_unwind_cpp_pr2(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) EXPORT_SYMBOL(__aeabi_unwind_cpp_pr2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct unwind_ctrl_block {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long vrs[16]; /* virtual register set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) const unsigned long *insn; /* pointer to the current instructions word */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned long sp_high; /* highest value of sp allowed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * 1 : check for stack overflow for each register pop.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * 0 : save overhead if there is plenty of stack remaining.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int check_each_pop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int entries; /* number of entries left to interpret */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int byte; /* current byte number in the instructions word */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) enum regs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #ifdef CONFIG_THUMB2_KERNEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) FP = 7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) FP = 11,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) SP = 13,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) LR = 14,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) PC = 15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) extern const struct unwind_idx __start_unwind_idx[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static const struct unwind_idx *__origin_unwind_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) extern const struct unwind_idx __stop_unwind_idx[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static DEFINE_RAW_SPINLOCK(unwind_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static LIST_HEAD(unwind_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* Convert a prel31 symbol to an absolute address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define prel31_to_addr(ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* sign-extend to 32 bits */ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) long offset = (((long)*(ptr)) << 1) >> 1; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) (unsigned long)(ptr) + offset; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * Binary search in the unwind index. The entries are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * guaranteed to be sorted in ascending order by the linker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * start = first entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * origin = first entry with positive offset (or stop if there is no such entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * stop - 1 = last entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static const struct unwind_idx *search_index(unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) const struct unwind_idx *start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) const struct unwind_idx *origin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) const struct unwind_idx *stop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) unsigned long addr_prel31;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) pr_debug("%s(%08lx, %p, %p, %p)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) __func__, addr, start, origin, stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * only search in the section with the matching sign. This way the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * prel31 numbers can be compared as unsigned longs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (addr < (unsigned long)start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* negative offsets: [start; origin) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) stop = origin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* positive offsets: [origin; stop) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) start = origin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* prel31 for address relavive to start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) addr_prel31 = (addr - (unsigned long)start) & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) while (start < stop - 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) const struct unwind_idx *mid = start + ((stop - start) >> 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * As addr_prel31 is relative to start an offset is needed to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * make it relative to mid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (addr_prel31 - ((unsigned long)mid - (unsigned long)start) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) mid->addr_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) stop = mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* keep addr_prel31 relative to start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) addr_prel31 -= ((unsigned long)mid -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) (unsigned long)start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) start = mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (likely(start->addr_offset <= addr_prel31))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) pr_warn("unwind: Unknown symbol address %08lx\n", addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static const struct unwind_idx *unwind_find_origin(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) const struct unwind_idx *start, const struct unwind_idx *stop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) pr_debug("%s(%p, %p)\n", __func__, start, stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) while (start < stop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) const struct unwind_idx *mid = start + ((stop - start) >> 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (mid->addr_offset >= 0x40000000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* negative offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) start = mid + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* positive offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) stop = mid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) pr_debug("%s -> %p\n", __func__, stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static const struct unwind_idx *unwind_find_idx(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) const struct unwind_idx *idx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) pr_debug("%s(%08lx)\n", __func__, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (core_kernel_text(addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (unlikely(!__origin_unwind_idx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) __origin_unwind_idx =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unwind_find_origin(__start_unwind_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) __stop_unwind_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /* main unwind table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) idx = search_index(addr, __start_unwind_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) __origin_unwind_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) __stop_unwind_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* module unwind tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct unwind_table *table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) raw_spin_lock_irqsave(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) list_for_each_entry(table, &unwind_tables, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (addr >= table->begin_addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) addr < table->end_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) idx = search_index(addr, table->start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) table->origin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) table->stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Move-to-front to exploit common traces */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) list_move(&table->list, &unwind_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) break;
^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) raw_spin_unlock_irqrestore(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pr_debug("%s: idx = %p\n", __func__, idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static unsigned long unwind_get_byte(struct unwind_ctrl_block *ctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (ctrl->entries <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) pr_warn("unwind: Corrupt unwind table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) ret = (*ctrl->insn >> (ctrl->byte * 8)) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (ctrl->byte == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ctrl->insn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ctrl->entries--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ctrl->byte = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ctrl->byte--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* Before poping a register check whether it is feasible or not */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) unsigned long **vsp, unsigned int reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (unlikely(ctrl->check_each_pop))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (*vsp >= (unsigned long *)ctrl->sp_high)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ctrl->vrs[reg] = *(*vsp)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* Helper functions to execute the instructions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static int unwind_exec_pop_subset_r4_to_r13(struct unwind_ctrl_block *ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) int load_sp, reg = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) load_sp = mask & (1 << (13 - 4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) while (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (mask & 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (unwind_pop_register(ctrl, &vsp, reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) mask >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) reg++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (!load_sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) ctrl->vrs[SP] = (unsigned long)vsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int unwind_exec_pop_r4_to_rN(struct unwind_ctrl_block *ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) unsigned long insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* pop R4-R[4+bbb] */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) for (reg = 4; reg <= 4 + (insn & 7); reg++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (unwind_pop_register(ctrl, &vsp, reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (insn & 0x8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (unwind_pop_register(ctrl, &vsp, 14))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ctrl->vrs[SP] = (unsigned long)vsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static int unwind_exec_pop_subset_r0_to_r3(struct unwind_ctrl_block *ctrl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int reg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) /* pop R0-R3 according to mask */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) while (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (mask & 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (unwind_pop_register(ctrl, &vsp, reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) mask >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) reg++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ctrl->vrs[SP] = (unsigned long)vsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^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) * Execute the current unwind instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static int unwind_exec_insn(struct unwind_ctrl_block *ctrl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) unsigned long insn = unwind_get_byte(ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int ret = URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) pr_debug("%s: insn = %08lx\n", __func__, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if ((insn & 0xc0) == 0x00)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) ctrl->vrs[SP] += ((insn & 0x3f) << 2) + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) else if ((insn & 0xc0) == 0x40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) ctrl->vrs[SP] -= ((insn & 0x3f) << 2) + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) else if ((insn & 0xf0) == 0x80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) unsigned long mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) insn = (insn << 8) | unwind_get_byte(ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) mask = insn & 0x0fff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (mask == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) pr_warn("unwind: 'Refuse to unwind' instruction %04lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) ret = unwind_exec_pop_subset_r4_to_r13(ctrl, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) } else if ((insn & 0xf0) == 0x90 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) (insn & 0x0d) != 0x0d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) ctrl->vrs[SP] = ctrl->vrs[insn & 0x0f];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) else if ((insn & 0xf0) == 0xa0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) ret = unwind_exec_pop_r4_to_rN(ctrl, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) } else if (insn == 0xb0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (ctrl->vrs[PC] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) ctrl->vrs[PC] = ctrl->vrs[LR];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* no further processing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) ctrl->entries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) } else if (insn == 0xb1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) unsigned long mask = unwind_get_byte(ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (mask == 0 || mask & 0xf0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) pr_warn("unwind: Spare encoding %04lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) (insn << 8) | mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ret = unwind_exec_pop_subset_r0_to_r3(ctrl, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) } else if (insn == 0xb2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) unsigned long uleb128 = unwind_get_byte(ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) ctrl->vrs[SP] += 0x204 + (uleb128 << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) pr_warn("unwind: Unhandled instruction %02lx\n", insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return -URC_FAILURE;
^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) pr_debug("%s: fp = %08lx sp = %08lx lr = %08lx pc = %08lx\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ctrl->vrs[FP], ctrl->vrs[SP], ctrl->vrs[LR], ctrl->vrs[PC]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * Unwind a single frame starting with *sp for the symbol at *pc. It
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * updates the *pc and *sp with the new values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) int unwind_frame(struct stackframe *frame)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) unsigned long low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) const struct unwind_idx *idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct unwind_ctrl_block ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) /* store the highest address on the stack to avoid crossing it*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) low = frame->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) ctrl.sp_high = ALIGN(low, THREAD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) pr_debug("%s(pc = %08lx lr = %08lx sp = %08lx)\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) frame->pc, frame->lr, frame->sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (!kernel_text_address(frame->pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) idx = unwind_find_idx(frame->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (!idx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) pr_warn("unwind: Index not found %08lx\n", frame->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) ctrl.vrs[FP] = frame->fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) ctrl.vrs[SP] = frame->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) ctrl.vrs[LR] = frame->lr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ctrl.vrs[PC] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (idx->insn == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /* can't unwind */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) else if ((idx->insn & 0x80000000) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) /* prel31 to the unwind table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) ctrl.insn = (unsigned long *)prel31_to_addr(&idx->insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) else if ((idx->insn & 0xff000000) == 0x80000000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /* only personality routine 0 supported in the index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) ctrl.insn = &idx->insn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) pr_warn("unwind: Unsupported personality routine %08lx in the index at %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) idx->insn, idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /* check the personality routine */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) if ((*ctrl.insn & 0xff000000) == 0x80000000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) ctrl.byte = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) ctrl.entries = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) } else if ((*ctrl.insn & 0xff000000) == 0x81000000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) ctrl.byte = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) ctrl.entries = 1 + ((*ctrl.insn & 0x00ff0000) >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) pr_warn("unwind: Unsupported personality routine %08lx at %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) *ctrl.insn, ctrl.insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) ctrl.check_each_pop = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) while (ctrl.entries > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int urc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if ((ctrl.sp_high - ctrl.vrs[SP]) < sizeof(ctrl.vrs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) ctrl.check_each_pop = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) urc = unwind_exec_insn(&ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (urc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return urc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (ctrl.vrs[SP] < low || ctrl.vrs[SP] >= ctrl.sp_high)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (ctrl.vrs[PC] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) ctrl.vrs[PC] = ctrl.vrs[LR];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /* check for infinite loop */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (frame->pc == ctrl.vrs[PC] && frame->sp == ctrl.vrs[SP])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return -URC_FAILURE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) frame->fp = ctrl.vrs[FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) frame->sp = ctrl.vrs[SP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) frame->lr = ctrl.vrs[LR];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) frame->pc = ctrl.vrs[PC];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) return URC_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct stackframe frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (!tsk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) tsk = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (regs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) arm_get_current_stackframe(regs, &frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /* PC might be corrupted, use LR in that case. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (!kernel_text_address(regs->ARM_pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) frame.pc = regs->ARM_lr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) } else if (tsk == current) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) frame.fp = (unsigned long)__builtin_frame_address(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) frame.sp = current_stack_pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) frame.lr = (unsigned long)__builtin_return_address(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) frame.pc = (unsigned long)unwind_backtrace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* task blocked in __switch_to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) frame.fp = thread_saved_fp(tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) frame.sp = thread_saved_sp(tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * The function calling __switch_to cannot be a leaf function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * so LR is recovered from the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) frame.lr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) frame.pc = thread_saved_pc(tsk);
^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) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) int urc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) unsigned long where = frame.pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) urc = unwind_frame(&frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (urc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) dump_backtrace_entry(where, frame.pc, frame.sp - 4, 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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) struct unwind_table *unwind_table_add(unsigned long start, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) unsigned long text_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) unsigned long text_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct unwind_table *tab = kmalloc(sizeof(*tab), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) pr_debug("%s(%08lx, %08lx, %08lx, %08lx)\n", __func__, start, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) text_addr, text_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (!tab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return tab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) tab->start = (const struct unwind_idx *)start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) tab->stop = (const struct unwind_idx *)(start + size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) tab->origin = unwind_find_origin(tab->start, tab->stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) tab->begin_addr = text_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) tab->end_addr = text_addr + text_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) raw_spin_lock_irqsave(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) list_add_tail(&tab->list, &unwind_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) raw_spin_unlock_irqrestore(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return tab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) void unwind_table_del(struct unwind_table *tab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (!tab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) raw_spin_lock_irqsave(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) list_del(&tab->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) raw_spin_unlock_irqrestore(&unwind_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) kfree(tab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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