Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Heiko Carstens |
336 |
77.60% |
9 |
47.37% |
| Martin Schwidefsky |
54 |
12.47% |
3 |
15.79% |
| Ilya Leoshkevich |
24 |
5.54% |
1 |
5.26% |
| Gerald Schaefer |
9 |
2.08% |
2 |
10.53% |
| Vasily Gorbik |
6 |
1.39% |
1 |
5.26% |
| Linus Torvalds (pre-git) |
2 |
0.46% |
1 |
5.26% |
| Paul Gortmaker |
1 |
0.23% |
1 |
5.26% |
| Greg Kroah-Hartman |
1 |
0.23% |
1 |
5.26% |
| Total |
433 |
|
19 |
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/bitfield.h>
#include <linux/extable.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/panic.h>
#include <asm/asm-extable.h>
#include <asm/extable.h>
const struct exception_table_entry *s390_search_extables(unsigned long addr)
{
const struct exception_table_entry *fixup;
size_t num;
fixup = search_exception_tables(addr);
if (fixup)
return fixup;
num = __stop_amode31_ex_table - __start_amode31_ex_table;
return search_extable(__start_amode31_ex_table, num, addr);
}
static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_regs *regs)
{
regs->psw.addr = extable_fixup(ex);
return true;
}
static bool ex_handler_ua_store(const struct exception_table_entry *ex, struct pt_regs *regs)
{
unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
regs->gprs[reg_err] = -EFAULT;
regs->psw.addr = extable_fixup(ex);
return true;
}
static bool ex_handler_ua_load_mem(const struct exception_table_entry *ex, struct pt_regs *regs)
{
unsigned int reg_addr = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
size_t len = FIELD_GET(EX_DATA_LEN, ex->data);
regs->gprs[reg_err] = -EFAULT;
memset((void *)regs->gprs[reg_addr], 0, len);
regs->psw.addr = extable_fixup(ex);
return true;
}
static bool ex_handler_ua_load_reg(const struct exception_table_entry *ex, struct pt_regs *regs)
{
unsigned int reg_zero = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
regs->gprs[reg_err] = -EFAULT;
regs->gprs[reg_zero] = 0;
regs->psw.addr = extable_fixup(ex);
return true;
}
bool fixup_exception(struct pt_regs *regs)
{
const struct exception_table_entry *ex;
ex = s390_search_extables(instruction_pointer(regs));
if (!ex)
return false;
switch (ex->type) {
case EX_TYPE_FIXUP:
return ex_handler_fixup(ex, regs);
case EX_TYPE_BPF:
return ex_handler_bpf(ex, regs);
case EX_TYPE_UA_STORE:
return ex_handler_ua_store(ex, regs);
case EX_TYPE_UA_LOAD_MEM:
return ex_handler_ua_load_mem(ex, regs);
case EX_TYPE_UA_LOAD_REG:
return ex_handler_ua_load_reg(ex, regs);
}
panic("invalid exception table entry");
}