Release 4.14 arch/s390/kernel/jump_label.c
// SPDX-License-Identifier: GPL-2.0
/*
* Jump label s390 support
*
* Copyright IBM Corp. 2011
* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
*/
#include <linux/uaccess.h>
#include <linux/stop_machine.h>
#include <linux/jump_label.h>
#include <asm/ipl.h>
#ifdef HAVE_JUMP_LABEL
struct insn {
u16 opcode;
s32 offset;
} __packed;
struct insn_args {
struct jump_entry *entry;
enum jump_label_type type;
};
static void jump_label_make_nop(struct jump_entry *entry, struct insn *insn)
{
/* brcl 0,0 */
insn->opcode = 0xc004;
insn->offset = 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 19 | 65.52% | 1 | 50.00% |
| Jan Glauber | 10 | 34.48% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
static void jump_label_make_branch(struct jump_entry *entry, struct insn *insn)
{
/* brcl 15,offset */
insn->opcode = 0xc0f4;
insn->offset = (entry->target - entry->code) >> 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jan Glauber | 26 | 66.67% | 1 | 50.00% |
| Heiko Carstens | 13 | 33.33% | 1 | 50.00% |
| Total | 39 | 100.00% | 2 | 100.00% |
static void jump_label_bug(struct jump_entry *entry, struct insn *expected,
struct insn *new)
{
unsigned char *ipc = (unsigned char *)entry->code;
unsigned char *ipe = (unsigned char *)expected;
unsigned char *ipn = (unsigned char *)new;
pr_emerg("Jump label code mismatch at %pS [%p]\n", ipc, ipc);
pr_emerg("Found: %6ph\n", ipc);
pr_emerg("Expected: %6ph\n", ipe);
pr_emerg("New: %6ph\n", ipn);
panic("Corrupted kernel text");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 87 | 92.55% | 2 | 50.00% |
| Jan Glauber | 4 | 4.26% | 1 | 25.00% |
| Alexander Kuleshov | 3 | 3.19% | 1 | 25.00% |
| Total | 94 | 100.00% | 4 | 100.00% |
static struct insn orignop = {
.opcode = 0xc004,
.offset = JUMP_LABEL_NOP_OFFSET >> 1,
};
static void __jump_label_transform(struct jump_entry *entry,
enum jump_label_type type,
int init)
{
struct insn old, new;
if (type == JUMP_LABEL_JMP) {
jump_label_make_nop(entry, &old);
jump_label_make_branch(entry, &new);
} else {
jump_label_make_branch(entry, &old);
jump_label_make_nop(entry, &new);
}
if (init) {
if (memcmp((void *)entry->code, &orignop, sizeof(orignop)))
jump_label_bug(entry, &orignop, &new);
} else {
if (memcmp((void *)entry->code, &old, sizeof(old)))
jump_label_bug(entry, &old, &new);
}
s390_kernel_write((void *)entry->code, &new, sizeof(new));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 141 | 88.68% | 4 | 57.14% |
| Jeremy Fitzhardinge | 9 | 5.66% | 1 | 14.29% |
| Jan Glauber | 8 | 5.03% | 1 | 14.29% |
| Peter Zijlstra | 1 | 0.63% | 1 | 14.29% |
| Total | 159 | 100.00% | 7 | 100.00% |
static int __sm_arch_jump_label_transform(void *data)
{
struct insn_args *args = data;
__jump_label_transform(args->entry, args->type, 0);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Fitzhardinge | 31 | 93.94% | 1 | 50.00% |
| Heiko Carstens | 2 | 6.06% | 1 | 50.00% |
| Total | 33 | 100.00% | 2 | 100.00% |
void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type)
{
struct insn_args args;
args.entry = entry;
args.type = type;
stop_machine_cpuslocked(__sm_arch_jump_label_transform, &args, NULL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Fitzhardinge | 22 | 55.00% | 1 | 33.33% |
| Jan Glauber | 17 | 42.50% | 1 | 33.33% |
| Thomas Gleixner | 1 | 2.50% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
void arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type)
{
__jump_label_transform(entry, type, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeremy Fitzhardinge | 21 | 91.30% | 1 | 50.00% |
| Heiko Carstens | 2 | 8.70% | 1 | 50.00% |
| Total | 23 | 100.00% | 2 | 100.00% |
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Heiko Carstens | 283 | 58.84% | 4 | 40.00% |
| Jan Glauber | 104 | 21.62% | 1 | 10.00% |
| Jeremy Fitzhardinge | 88 | 18.30% | 1 | 10.00% |
| Alexander Kuleshov | 3 | 0.62% | 1 | 10.00% |
| Peter Zijlstra | 1 | 0.21% | 1 | 10.00% |
| Greg Kroah-Hartman | 1 | 0.21% | 1 | 10.00% |
| Thomas Gleixner | 1 | 0.21% | 1 | 10.00% |
| Total | 481 | 100.00% | 10 | 100.00% |
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