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// 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);
}
static noinline void print_stacktrace(void)
{
struct stack_info boot_stack = { STACK_TYPE_TASK, (unsigned long)_stack_start,
(unsigned long)_stack_end };
unsigned long sp = S390_lowcore.gpregs_save_area[15];
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();
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);
}
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