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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2012-07-31 11:03:04 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-09-26 15:45:02 +0200
commitd35339a42dd1f53b0bb86cf75418a9b7cf5f0f30 (patch)
tree7f6447709e0bdb601687c40c42e09c3ca6deff8c /arch/s390/kernel/traps.c
parente4b8b3f33fcaa0ed6e6b5482a606091d8cd20beb (diff)
downloadlinux-d35339a42dd1f53b0bb86cf75418a9b7cf5f0f30.tar.bz2
s390: add support for transactional memory
Allow user-space processes to use transactional execution (TX). If the TX facility is available user space programs can use transactions for fine-grained serialization based on the data objects that are referenced during a transaction. This is useful for lockless data structures and speculative compiler optimizations. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/traps.c')
-rw-r--r--arch/s390/kernel/traps.c37
1 files changed, 27 insertions, 10 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 01775c04a90e..29af52628e8b 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -57,6 +57,23 @@ static int kstack_depth_to_print = 12;
static int kstack_depth_to_print = 20;
#endif /* CONFIG_64BIT */
+static inline void __user *get_trap_ip(struct pt_regs *regs)
+{
+#ifdef CONFIG_64BIT
+ unsigned long address;
+
+ if (regs->int_code & 0x200)
+ address = *(unsigned long *)(current->thread.trap_tdb + 24);
+ else
+ address = regs->psw.addr;
+ return (void __user *)
+ ((address - (regs->int_code >> 16)) & PSW_ADDR_INSN);
+#else
+ return (void __user *)
+ ((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
+#endif
+}
+
/*
* For show_trace we have tree different stack to consider:
* - the panic stack which is used if the kernel stack has overflown
@@ -285,12 +302,6 @@ int is_valid_bugaddr(unsigned long addr)
return 1;
}
-static inline void __user *get_psw_address(struct pt_regs *regs)
-{
- return (void __user *)
- ((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
-}
-
static void __kprobes do_trap(struct pt_regs *regs,
int si_signo, int si_code, char *str)
{
@@ -304,7 +315,7 @@ static void __kprobes do_trap(struct pt_regs *regs,
info.si_signo = si_signo;
info.si_errno = 0;
info.si_code = si_code;
- info.si_addr = get_psw_address(regs);
+ info.si_addr = get_trap_ip(regs);
force_sig_info(si_signo, &info, current);
report_user_fault(regs, si_signo);
} else {
@@ -381,6 +392,11 @@ DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
"translation exception")
+#ifdef CONFIG_64BIT
+DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
+ "transaction constraint exception")
+#endif
+
static inline void do_fp_trap(struct pt_regs *regs, int fpc)
{
int si_code = 0;
@@ -408,7 +424,7 @@ static void __kprobes illegal_op(struct pt_regs *regs)
__u16 __user *location;
int signal = 0;
- location = get_psw_address(regs);
+ location = get_trap_ip(regs);
if (user_mode(regs)) {
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
@@ -476,7 +492,7 @@ void specification_exception(struct pt_regs *regs)
__u16 __user *location = NULL;
int signal = 0;
- location = (__u16 __user *) get_psw_address(regs);
+ location = (__u16 __user *) get_trap_ip(regs);
if (user_mode(regs)) {
get_user(*((__u16 *) opcode), location);
@@ -525,7 +541,7 @@ static void data_exception(struct pt_regs *regs)
__u16 __user *location;
int signal = 0;
- location = get_psw_address(regs);
+ location = get_trap_ip(regs);
if (MACHINE_HAS_IEEE)
asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
@@ -641,6 +657,7 @@ void __init trap_init(void)
pgm_check_table[0x12] = &translation_exception;
pgm_check_table[0x13] = &special_op_exception;
#ifdef CONFIG_64BIT
+ pgm_check_table[0x18] = &transaction_exception;
pgm_check_table[0x38] = &do_asce_exception;
pgm_check_table[0x39] = &do_dat_exception;
pgm_check_table[0x3A] = &do_dat_exception;