s390/decompressor: print cmdline and BEAR on pgm_check

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) torvalds#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 <[email protected]>
Acked-by: Viktor Mihajlovski <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

arch/s390/boot/pgm_check_info.c

@@ -3,9 +3,11 @@
 #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 <stdarg.h>
 #include "boot.h"
 
@@ -149,6 +151,8 @@ void print_pgm_check_info(void)
 	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)
@@ -171,4 +175,7 @@ void print_pgm_check_info(void)
 	decompressor_printk("      %016lx %016lx %016lx %016lx\n",
 			    gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
 	print_stacktrace();
+	decompressor_printk("Last Breaking-Event-Address:\n");
+	decompressor_printk(" [<%016lx>] %pS\n", (unsigned long)S390_lowcore.breaking_event_addr,
+			    (void *)S390_lowcore.breaking_event_addr);
 }