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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-10-06 08:34:13 (GMT)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-10-06 08:35:10 (GMT)
commitea2a4d3a3a929ef494952bba57a0ef1a8a877881 (patch)
tree757cd0a94f71a3d62d3c5038e408fcd49796685f /arch/s390/kernel/ptrace.c
parentdd43bfca431b02117e8598e01b301e001a68295e (diff)
downloadlinux-ea2a4d3a3a929ef494952bba57a0ef1a8a877881.tar.xz
[S390] 64-bit register support for 31-bit processes
From: Heiko Carstens <heiko.carstens@de.ibm.com> From: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
-rw-r--r--arch/s390/kernel/ptrace.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index a873867..653c6a1 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -57,6 +57,7 @@
enum s390_regset {
REGSET_GENERAL,
REGSET_FP,
+ REGSET_GENERAL_EXTENDED,
};
static void
@@ -879,6 +880,67 @@ static int s390_compat_regs_set(struct task_struct *target,
return rc;
}
+static int s390_compat_regs_high_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ compat_ulong_t *gprs_high;
+
+ gprs_high = (compat_ulong_t *)
+ &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
+ if (kbuf) {
+ compat_ulong_t *k = kbuf;
+ while (count > 0) {
+ *k++ = *gprs_high;
+ gprs_high += 2;
+ count -= sizeof(*k);
+ }
+ } else {
+ compat_ulong_t __user *u = ubuf;
+ while (count > 0) {
+ if (__put_user(*gprs_high, u++))
+ return -EFAULT;
+ gprs_high += 2;
+ count -= sizeof(*u);
+ }
+ }
+ return 0;
+}
+
+static int s390_compat_regs_high_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ compat_ulong_t *gprs_high;
+ int rc = 0;
+
+ gprs_high = (compat_ulong_t *)
+ &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
+ if (kbuf) {
+ const compat_ulong_t *k = kbuf;
+ while (count > 0) {
+ *gprs_high = *k++;
+ *gprs_high += 2;
+ count -= sizeof(*k);
+ }
+ } else {
+ const compat_ulong_t __user *u = ubuf;
+ while (count > 0 && !rc) {
+ unsigned long word;
+ rc = __get_user(word, u++);
+ if (rc)
+ break;
+ *gprs_high = word;
+ *gprs_high += 2;
+ count -= sizeof(*u);
+ }
+ }
+
+ return rc;
+}
+
static const struct user_regset s390_compat_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
@@ -896,6 +958,14 @@ static const struct user_regset s390_compat_regsets[] = {
.get = s390_fpregs_get,
.set = s390_fpregs_set,
},
+ [REGSET_GENERAL_EXTENDED] = {
+ .core_note_type = NT_PRXSTATUS,
+ .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
+ .size = sizeof(compat_long_t),
+ .align = sizeof(compat_long_t),
+ .get = s390_compat_regs_high_get,
+ .set = s390_compat_regs_high_set,
+ },
};
static const struct user_regset_view user_s390_compat_view = {