[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>
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index b537cb0..eee9998 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -39,6 +39,7 @@
struct sigcontext32 sc;
_sigregs32 sregs;
int signo;
+ __u32 gprs_high[NUM_GPRS];
__u8 retcode[S390_SYSCALL_SIZE];
} sigframe32;
@@ -48,6 +49,7 @@
__u8 retcode[S390_SYSCALL_SIZE];
compat_siginfo_t info;
struct ucontext32 uc;
+ __u32 gprs_high[NUM_GPRS];
} rt_sigframe32;
int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
@@ -344,6 +346,30 @@
return 0;
}
+static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
+{
+ __u32 gprs_high[NUM_GPRS];
+ int i;
+
+ for (i = 0; i < NUM_GPRS; i++)
+ gprs_high[i] = regs->gprs[i] >> 32;
+
+ return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
+}
+
+static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
+{
+ __u32 gprs_high[NUM_GPRS];
+ int err, i;
+
+ err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
+ if (err)
+ return err;
+ for (i = 0; i < NUM_GPRS; i++)
+ *(__u32 *)®s->gprs[i] = gprs_high[i];
+ return 0;
+}
+
asmlinkage long sys32_sigreturn(void)
{
struct pt_regs *regs = task_pt_regs(current);
@@ -363,6 +389,8 @@
if (restore_sigregs32(regs, &frame->sregs))
goto badframe;
+ if (restore_sigregs_gprs_high(regs, frame->gprs_high))
+ goto badframe;
return regs->gprs[2];
@@ -394,6 +422,8 @@
if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
goto badframe;
+ if (restore_sigregs_gprs_high(regs, frame->gprs_high))
+ goto badframe;
err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
st.ss_sp = compat_ptr(ss_sp);
@@ -474,6 +504,8 @@
if (save_sigregs32(regs, &frame->sregs))
goto give_sigsegv;
+ if (save_sigregs_gprs_high(regs, frame->gprs_high))
+ goto give_sigsegv;
if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
goto give_sigsegv;
@@ -529,13 +561,14 @@
goto give_sigsegv;
/* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->gprs[15]),
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
+ err |= save_sigregs_gprs_high(regs, frame->gprs_high);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
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 @@
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 @@
.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 = {
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 9ed13a1..061479f 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -729,7 +729,7 @@
if ((facility_list & (1UL << (31 - 22)))
&& (facility_list & (1UL << (31 - 30))))
- elf_hwcap |= 1UL << 8;
+ elf_hwcap |= HWCAP_S390_ETF3EH;
/*
* Check for additional facilities with store-facility-list-extended.
@@ -748,11 +748,20 @@
__stfle(&facility_list_extended, 1) > 0) {
if ((facility_list_extended & (1ULL << (63 - 42)))
&& (facility_list_extended & (1ULL << (63 - 44))))
- elf_hwcap |= 1UL << 6;
+ elf_hwcap |= HWCAP_S390_DFP;
}
+ /*
+ * Huge page support HWCAP_S390_HPAGE is bit 7.
+ */
if (MACHINE_HAS_HPAGE)
- elf_hwcap |= 1UL << 7;
+ elf_hwcap |= HWCAP_S390_HPAGE;
+
+ /*
+ * 64-bit register support for 31-bit processes
+ * HWCAP_S390_HIGH_GPRS is bit 9.
+ */
+ elf_hwcap |= HWCAP_S390_HIGH_GPRS;
switch (S390_lowcore.cpu_id.machine) {
case 0x9672: