1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/stdarg.h>
4#include <linux/string.h>
5#include <linux/ctype.h>
6#include <asm/stacktrace.h>
7#include <asm/boot_data.h>
8#include <asm/lowcore.h>
9#include <asm/setup.h>
10#include <asm/sclp.h>
11#include <asm/uv.h>
12#include "boot.h"
13
14void print_stacktrace(unsigned long sp)
15{
16 struct stack_info boot_stack = { STACK_TYPE_TASK, (unsigned long)_stack_start,
17 (unsigned long)_stack_end };
18 bool first = true;
19
20 boot_emerg("Call Trace:\n");
21 while (!(sp & 0x7) && on_stack(info: &boot_stack, addr: sp, len: sizeof(struct stack_frame))) {
22 struct stack_frame *sf = (struct stack_frame *)sp;
23
24 if (first)
25 boot_emerg("(sp:%016lx [<%016lx>] %pS)\n", sp, sf->gprs[8], (void *)sf->gprs[8]);
26 else
27 boot_emerg(" sp:%016lx [<%016lx>] %pS\n", sp, sf->gprs[8], (void *)sf->gprs[8]);
28 if (sf->back_chain <= sp)
29 break;
30 sp = sf->back_chain;
31 first = false;
32 }
33}
34
35extern struct exception_table_entry __start___ex_table[];
36extern struct exception_table_entry __stop___ex_table[];
37
38static inline unsigned long extable_insn(const struct exception_table_entry *x)
39{
40 return (unsigned long)&x->insn + x->insn;
41}
42
43static bool ex_handler(struct pt_regs *regs)
44{
45 const struct exception_table_entry *ex;
46
47 for (ex = __start___ex_table; ex < __stop___ex_table; ex++) {
48 if (extable_insn(x: ex) != regs->psw.addr)
49 continue;
50 if (ex->type != EX_TYPE_FIXUP)
51 return false;
52 regs->psw.addr = extable_fixup(ex);
53 return true;
54 }
55 return false;
56}
57
58void do_pgm_check(struct pt_regs *regs)
59{
60 struct psw_bits *psw = &psw_bits(regs->psw);
61 unsigned long *gpregs = regs->gprs;
62
63 if (ex_handler(regs))
64 return;
65 if (bootdebug)
66 boot_rb_dump();
67 boot_emerg("Linux version %s\n", kernel_version);
68 if (!is_prot_virt_guest() && early_command_line[0])
69 boot_emerg("Kernel command line: %s\n", early_command_line);
70 boot_emerg("Kernel fault: interruption code %04x ilc:%d\n",
71 regs->int_code & 0xffff, regs->int_code >> 17);
72 if (kaslr_enabled()) {
73 boot_emerg("Kernel random base: %lx\n", __kaslr_offset);
74 boot_emerg("Kernel random base phys: %lx\n", __kaslr_offset_phys);
75 }
76 boot_emerg("PSW : %016lx %016lx (%pS)\n",
77 regs->psw.mask, regs->psw.addr, (void *)regs->psw.addr);
78 boot_emerg(" 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",
79 psw->per, psw->dat, psw->io, psw->ext, psw->key, psw->mcheck,
80 psw->wait, psw->pstate, psw->as, psw->cc, psw->pm, psw->ri, psw->eaba);
81 boot_emerg("GPRS: %016lx %016lx %016lx %016lx\n", gpregs[0], gpregs[1], gpregs[2], gpregs[3]);
82 boot_emerg(" %016lx %016lx %016lx %016lx\n", gpregs[4], gpregs[5], gpregs[6], gpregs[7]);
83 boot_emerg(" %016lx %016lx %016lx %016lx\n", gpregs[8], gpregs[9], gpregs[10], gpregs[11]);
84 boot_emerg(" %016lx %016lx %016lx %016lx\n", gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
85 print_stacktrace(sp: gpregs[15]);
86 boot_emerg("Last Breaking-Event-Address:\n");
87 boot_emerg(" [<%016lx>] %pS\n", regs->last_break, (void *)regs->last_break);
88 /* Convert to disabled wait PSW */
89 psw->io = 0;
90 psw->ext = 0;
91 psw->wait = 1;
92}
93

source code of linux/arch/s390/boot/pgm_check.c