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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | // SPDX-License-Identifier: GPL-2.0 #include <linux/kernel.h> #include <linux/stdarg.h> #include <linux/string.h> #include <linux/ctype.h> #include <asm/stacktrace.h> #include <asm/boot_data.h> #include <asm/lowcore.h> #include <asm/setup.h> #include <asm/sclp.h> #include <asm/uv.h> #include "boot.h" const char hex_asc[] = "0123456789abcdef"; static char *as_hex(char *dst, unsigned long val, int pad) { char *p, *end = p = dst + max(pad, (int)__fls(val | 1) / 4 + 1); for (*p-- = 0; p >= dst; val >>= 4) *p-- = hex_asc[val & 0x0f]; return end; } static char *symstart(char *p) { while (*p) p--; return p + 1; } static noinline char *findsym(unsigned long ip, unsigned short *off, unsigned short *len) { /* symbol entries are in a form "10000 c4 startup\0" */ char *a = _decompressor_syms_start; char *b = _decompressor_syms_end; unsigned long start; unsigned long size; char *pivot; char *endp; while (a < b) { pivot = symstart(a + (b - a) / 2); start = simple_strtoull(pivot, &endp, 16); size = simple_strtoull(endp + 1, &endp, 16); if (ip < start) { b = pivot; continue; } if (ip > start + size) { a = pivot + strlen(pivot) + 1; continue; } *off = ip - start; *len = size; return endp + 1; } return NULL; } static noinline char *strsym(void *ip) { static char buf[64]; unsigned short off; unsigned short len; char *p; p = findsym((unsigned long)ip, &off, &len); if (p) { strncpy(buf, p, sizeof(buf)); /* reserve 15 bytes for offset/len in symbol+0x1234/0x1234 */ p = buf + strnlen(buf, sizeof(buf) - 15); strcpy(p, "+0x"); p = as_hex(p + 3, off, 0); strcpy(p, "/0x"); as_hex(p + 3, len, 0); } else { as_hex(buf, (unsigned long)ip, 16); } return buf; } void decompressor_printk(const char *fmt, ...) { char buf[1024] = { 0 }; char *end = buf + sizeof(buf) - 1; /* make sure buf is 0 terminated */ unsigned long pad; char *p = buf; va_list args; va_start(args, fmt); for (; p < end && *fmt; fmt++) { if (*fmt != '%') { *p++ = *fmt; continue; } pad = isdigit(*++fmt) ? simple_strtol(fmt, (char **)&fmt, 10) : 0; switch (*fmt) { case 's': p = buf + strlcat(buf, va_arg(args, char *), sizeof(buf)); break; case 'p': if (*++fmt != 'S') goto out; p = buf + strlcat(buf, strsym(va_arg(args, void *)), sizeof(buf)); break; case 'l': if (*++fmt != 'x' || end - p <= max(sizeof(long) * 2, pad)) goto out; p = as_hex(p, va_arg(args, unsigned long), pad); break; case 'x': if (end - p <= max(sizeof(int) * 2, pad)) goto out; p = as_hex(p, va_arg(args, unsigned int), pad); break; default: goto out; } } out: va_end(args); sclp_early_printk(buf); } void print_stacktrace(unsigned long sp) { struct stack_info boot_stack = { STACK_TYPE_TASK, (unsigned long)_stack_start, (unsigned long)_stack_end }; bool first = true; decompressor_printk("Call Trace:\n"); while (!(sp & 0x7) && on_stack(&boot_stack, sp, sizeof(struct stack_frame))) { struct stack_frame *sf = (struct stack_frame *)sp; decompressor_printk(first ? "(sp:%016lx [<%016lx>] %pS)\n" : " sp:%016lx [<%016lx>] %pS\n", sp, sf->gprs[8], (void *)sf->gprs[8]); if (sf->back_chain <= sp) break; sp = sf->back_chain; first = false; } } void print_pgm_check_info(void) { unsigned long *gpregs = (unsigned long *)S390_lowcore.gpregs_save_area; struct psw_bits *psw = &psw_bits(S390_lowcore.psw_save_area); decompressor_printk("Linux version %s\n", kernel_version); if (!is_prot_virt_guest() && early_command_line[0]) decompressor_printk("Kernel command line: %s\n", early_command_line); decompressor_printk("Kernel fault: interruption code %04x ilc:%x\n", S390_lowcore.pgm_code, S390_lowcore.pgm_ilc >> 1); if (kaslr_enabled()) decompressor_printk("Kernel random base: %lx\n", __kaslr_offset); decompressor_printk("PSW : %016lx %016lx (%pS)\n", S390_lowcore.psw_save_area.mask, S390_lowcore.psw_save_area.addr, (void *)S390_lowcore.psw_save_area.addr); decompressor_printk( " R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x P:%x AS:%x CC:%x PM:%x RI:%x EA:%x\n", psw->per, psw->dat, psw->io, psw->ext, psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm, psw->ri, psw->eaba); decompressor_printk("GPRS: %016lx %016lx %016lx %016lx\n", gpregs[0], gpregs[1], gpregs[2], gpregs[3]); decompressor_printk(" %016lx %016lx %016lx %016lx\n", gpregs[4], gpregs[5], gpregs[6], gpregs[7]); decompressor_printk(" %016lx %016lx %016lx %016lx\n", gpregs[8], gpregs[9], gpregs[10], gpregs[11]); decompressor_printk(" %016lx %016lx %016lx %016lx\n", gpregs[12], gpregs[13], gpregs[14], gpregs[15]); print_stacktrace(S390_lowcore.gpregs_save_area[15]); decompressor_printk("Last Breaking-Event-Address:\n"); decompressor_printk(" [<%016lx>] %pS\n", (unsigned long)S390_lowcore.pgm_last_break, (void *)S390_lowcore.pgm_last_break); } |