forked from Minki/linux
ba1a6be994
Add kernel command line and last breaking event. The kernel command line is taken from early_command_line and printed only if kernel is not running as protected virtualization guest and if it has been already initialized from the "COMMAND_LINE". Linux version 5.10.0-rc3-22794-gecaa72788df0-dirty (gor@tuxmaker) #28 SMP PREEMPT Mon Nov 9 17:41:20 CET 2020 Kernel command line: audit_enable=0 audit=0 selinux=0 crashkernel=296M root=/dev/dasda1 dasd=ec5b memblock=debug die Kernel fault: interruption code 0005 ilc:2 PSW : 0000000180000000 0000000000012f92 (parse_boot_command_line+0x27a/0x46c) R:0 T:0 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:0 CC:0 PM:0 RI:0 EA:3 GPRS: 0000000000000000 00ffffffffffffff 0000000000000000 000000000001a65c 000000000000bf60 0000000000000000 00000000000003c0 0000000000000000 0000000000000080 000000000002322d 000000007f29ef20 0000000000efd018 000000000311c000 0000000000010070 0000000000012f82 000000000000bea8 Call Trace: (sp:000000000000bea8 [<000000000002016e>] 000000000002016e) sp:000000000000bf18 [<0000000000012408>] startup_kernel+0x88/0x2fc sp:000000000000bf60 [<00000000000100c4>] startup_normal+0xb0/0xb0 Last Breaking-Event-Address: [<00000000000135ba>] strcmp+0x22/0x24 Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Viktor Mihajlovski <mihajlov@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
182 lines
5.0 KiB
C
182 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <asm/stacktrace.h>
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#include <asm/boot_data.h>
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#include <asm/lowcore.h>
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#include <asm/setup.h>
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#include <asm/sclp.h>
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#include <asm/uv.h>
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#include <stdarg.h>
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#include "boot.h"
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const char hex_asc[] = "0123456789abcdef";
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static char *as_hex(char *dst, unsigned long val, int pad)
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{
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char *p, *end = p = dst + max(pad, (int)__fls(val | 1) / 4 + 1);
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for (*p-- = 0; p >= dst; val >>= 4)
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*p-- = hex_asc[val & 0x0f];
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return end;
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}
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static char *symstart(char *p)
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{
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while (*p)
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p--;
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return p + 1;
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}
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extern char _decompressor_syms_start[], _decompressor_syms_end[];
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static noinline char *findsym(unsigned long ip, unsigned short *off, unsigned short *len)
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{
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/* symbol entries are in a form "10000 c4 startup\0" */
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char *a = _decompressor_syms_start;
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char *b = _decompressor_syms_end;
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unsigned long start;
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unsigned long size;
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char *pivot;
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char *endp;
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while (a < b) {
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pivot = symstart(a + (b - a) / 2);
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start = simple_strtoull(pivot, &endp, 16);
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size = simple_strtoull(endp + 1, &endp, 16);
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if (ip < start) {
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b = pivot;
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continue;
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}
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if (ip > start + size) {
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a = pivot + strlen(pivot) + 1;
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continue;
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}
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*off = ip - start;
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*len = size;
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return endp + 1;
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}
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return NULL;
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}
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static noinline char *strsym(void *ip)
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{
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static char buf[64];
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unsigned short off;
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unsigned short len;
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char *p;
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p = findsym((unsigned long)ip, &off, &len);
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if (p) {
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strncpy(buf, p, sizeof(buf));
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/* reserve 15 bytes for offset/len in symbol+0x1234/0x1234 */
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p = buf + strnlen(buf, sizeof(buf) - 15);
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strcpy(p, "+0x");
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p = as_hex(p + 3, off, 0);
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strcpy(p, "/0x");
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as_hex(p + 3, len, 0);
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} else {
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as_hex(buf, (unsigned long)ip, 16);
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}
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return buf;
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}
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void decompressor_printk(const char *fmt, ...)
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{
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char buf[1024] = { 0 };
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char *end = buf + sizeof(buf) - 1; /* make sure buf is 0 terminated */
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unsigned long pad;
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char *p = buf;
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va_list args;
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va_start(args, fmt);
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for (; p < end && *fmt; fmt++) {
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if (*fmt != '%') {
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*p++ = *fmt;
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continue;
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}
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pad = isdigit(*++fmt) ? simple_strtol(fmt, (char **)&fmt, 10) : 0;
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switch (*fmt) {
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case 's':
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p = buf + strlcat(buf, va_arg(args, char *), sizeof(buf));
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break;
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case 'p':
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if (*++fmt != 'S')
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goto out;
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p = buf + strlcat(buf, strsym(va_arg(args, void *)), sizeof(buf));
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break;
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case 'l':
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if (*++fmt != 'x' || end - p <= max(sizeof(long) * 2, pad))
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goto out;
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p = as_hex(p, va_arg(args, unsigned long), pad);
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break;
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case 'x':
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if (end - p <= max(sizeof(int) * 2, pad))
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goto out;
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p = as_hex(p, va_arg(args, unsigned int), pad);
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break;
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default:
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goto out;
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}
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}
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out:
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va_end(args);
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sclp_early_printk(buf);
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}
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static noinline void print_stacktrace(void)
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{
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struct stack_info boot_stack = { STACK_TYPE_TASK, BOOT_STACK_OFFSET,
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BOOT_STACK_OFFSET + BOOT_STACK_SIZE };
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unsigned long sp = S390_lowcore.gpregs_save_area[15];
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bool first = true;
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decompressor_printk("Call Trace:\n");
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while (!(sp & 0x7) && on_stack(&boot_stack, sp, sizeof(struct stack_frame))) {
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struct stack_frame *sf = (struct stack_frame *)sp;
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decompressor_printk(first ? "(sp:%016lx [<%016lx>] %pS)\n" :
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" sp:%016lx [<%016lx>] %pS\n",
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sp, sf->gprs[8], (void *)sf->gprs[8]);
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if (sf->back_chain <= sp)
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break;
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sp = sf->back_chain;
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first = false;
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}
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}
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void print_pgm_check_info(void)
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{
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unsigned long *gpregs = (unsigned long *)S390_lowcore.gpregs_save_area;
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struct psw_bits *psw = &psw_bits(S390_lowcore.psw_save_area);
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decompressor_printk("Linux version %s\n", kernel_version);
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if (!is_prot_virt_guest() && early_command_line[0])
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decompressor_printk("Kernel command line: %s\n", early_command_line);
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decompressor_printk("Kernel fault: interruption code %04x ilc:%x\n",
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S390_lowcore.pgm_code, S390_lowcore.pgm_ilc >> 1);
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if (kaslr_enabled)
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decompressor_printk("Kernel random base: %lx\n", __kaslr_offset);
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decompressor_printk("PSW : %016lx %016lx (%pS)\n",
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S390_lowcore.psw_save_area.mask,
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S390_lowcore.psw_save_area.addr,
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(void *)S390_lowcore.psw_save_area.addr);
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decompressor_printk(
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" 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",
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psw->per, psw->dat, psw->io, psw->ext, psw->key, psw->mcheck,
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psw->wait, psw->pstate, psw->as, psw->cc, psw->pm, psw->ri,
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psw->eaba);
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decompressor_printk("GPRS: %016lx %016lx %016lx %016lx\n",
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gpregs[0], gpregs[1], gpregs[2], gpregs[3]);
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decompressor_printk(" %016lx %016lx %016lx %016lx\n",
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gpregs[4], gpregs[5], gpregs[6], gpregs[7]);
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decompressor_printk(" %016lx %016lx %016lx %016lx\n",
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gpregs[8], gpregs[9], gpregs[10], gpregs[11]);
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decompressor_printk(" %016lx %016lx %016lx %016lx\n",
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gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
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print_stacktrace();
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decompressor_printk("Last Breaking-Event-Address:\n");
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decompressor_printk(" [<%016lx>] %pS\n", (unsigned long)S390_lowcore.breaking_event_addr,
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(void *)S390_lowcore.breaking_event_addr);
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}
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