pgm_check.c

 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(&boot_stack, sp, 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(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(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}