forked from luck/tmp_suning_uos_patched
[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>
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dd43bfca43
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@ -92,6 +92,18 @@
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/* Keep this the last entry. */
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#define R_390_NUM 61
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/* Bits present in AT_HWCAP. */
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#define HWCAP_S390_ESAN3 1
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#define HWCAP_S390_ZARCH 2
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#define HWCAP_S390_STFLE 4
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#define HWCAP_S390_MSA 8
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#define HWCAP_S390_LDISP 16
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#define HWCAP_S390_EIMM 32
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#define HWCAP_S390_DFP 64
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#define HWCAP_S390_HPAGE 128
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#define HWCAP_S390_ETF3EH 256
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#define HWCAP_S390_HIGH_GPRS 512
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/*
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* These are used to set parameters in the core dumps.
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*/
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@ -311,6 +311,10 @@ typedef struct
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__u32 orig_gpr2;
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} s390_compat_regs;
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typedef struct
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{
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__u32 gprs_high[NUM_GPRS];
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} s390_compat_regs_high;
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#ifdef __KERNEL__
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@ -9,6 +9,21 @@
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#ifndef _ASM_S390_UCONTEXT_H
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#define _ASM_S390_UCONTEXT_H
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#define UC_EXTENDED 0x00000001
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#ifndef __s390x__
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struct ucontext_extended {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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_sigregs uc_mcontext;
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unsigned long uc_sigmask[2];
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unsigned long uc_gprs_high[16];
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};
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#endif
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struct ucontext {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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@ -39,6 +39,7 @@ typedef struct
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struct sigcontext32 sc;
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_sigregs32 sregs;
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int signo;
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__u32 gprs_high[NUM_GPRS];
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__u8 retcode[S390_SYSCALL_SIZE];
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} sigframe32;
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@ -48,6 +49,7 @@ typedef struct
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__u8 retcode[S390_SYSCALL_SIZE];
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compat_siginfo_t info;
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struct ucontext32 uc;
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__u32 gprs_high[NUM_GPRS];
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} rt_sigframe32;
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
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@ -344,6 +346,30 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
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return 0;
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}
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static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
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{
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__u32 gprs_high[NUM_GPRS];
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int i;
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for (i = 0; i < NUM_GPRS; i++)
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gprs_high[i] = regs->gprs[i] >> 32;
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return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
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}
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static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
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{
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__u32 gprs_high[NUM_GPRS];
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int err, i;
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err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
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if (err)
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return err;
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for (i = 0; i < NUM_GPRS; i++)
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*(__u32 *)®s->gprs[i] = gprs_high[i];
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return 0;
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}
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asmlinkage long sys32_sigreturn(void)
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{
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struct pt_regs *regs = task_pt_regs(current);
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@ -363,6 +389,8 @@ asmlinkage long sys32_sigreturn(void)
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if (restore_sigregs32(regs, &frame->sregs))
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goto badframe;
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if (restore_sigregs_gprs_high(regs, frame->gprs_high))
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goto badframe;
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return regs->gprs[2];
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@ -394,6 +422,8 @@ asmlinkage long sys32_rt_sigreturn(void)
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if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
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goto badframe;
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if (restore_sigregs_gprs_high(regs, frame->gprs_high))
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goto badframe;
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err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
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st.ss_sp = compat_ptr(ss_sp);
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@ -474,6 +504,8 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
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if (save_sigregs32(regs, &frame->sregs))
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goto give_sigsegv;
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if (save_sigregs_gprs_high(regs, frame->gprs_high))
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goto give_sigsegv;
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if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
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goto give_sigsegv;
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@ -529,13 +561,14 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
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goto give_sigsegv;
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/* Create the ucontext. */
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err |= __put_user(0, &frame->uc.uc_flags);
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err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
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err |= __put_user(0, &frame->uc.uc_link);
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err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
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err |= __put_user(sas_ss_flags(regs->gprs[15]),
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&frame->uc.uc_stack.ss_flags);
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err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
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err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
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err |= save_sigregs_gprs_high(regs, frame->gprs_high);
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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@ -57,6 +57,7 @@
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enum s390_regset {
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REGSET_GENERAL,
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REGSET_FP,
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REGSET_GENERAL_EXTENDED,
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};
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static void
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@ -879,6 +880,67 @@ static int s390_compat_regs_set(struct task_struct *target,
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return rc;
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}
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static int s390_compat_regs_high_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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compat_ulong_t *gprs_high;
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gprs_high = (compat_ulong_t *)
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&task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
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if (kbuf) {
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compat_ulong_t *k = kbuf;
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while (count > 0) {
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*k++ = *gprs_high;
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gprs_high += 2;
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count -= sizeof(*k);
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}
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} else {
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compat_ulong_t __user *u = ubuf;
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while (count > 0) {
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if (__put_user(*gprs_high, u++))
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return -EFAULT;
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gprs_high += 2;
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count -= sizeof(*u);
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}
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}
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return 0;
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}
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static int s390_compat_regs_high_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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compat_ulong_t *gprs_high;
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int rc = 0;
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gprs_high = (compat_ulong_t *)
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&task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
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if (kbuf) {
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const compat_ulong_t *k = kbuf;
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while (count > 0) {
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*gprs_high = *k++;
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*gprs_high += 2;
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count -= sizeof(*k);
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}
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} else {
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const compat_ulong_t __user *u = ubuf;
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while (count > 0 && !rc) {
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unsigned long word;
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rc = __get_user(word, u++);
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if (rc)
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break;
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*gprs_high = word;
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*gprs_high += 2;
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count -= sizeof(*u);
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}
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}
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return rc;
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}
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static const struct user_regset s390_compat_regsets[] = {
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.get = s390_fpregs_get,
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.set = s390_fpregs_set,
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},
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[REGSET_GENERAL_EXTENDED] = {
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.core_note_type = NT_PRXSTATUS,
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.n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
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.size = sizeof(compat_long_t),
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.align = sizeof(compat_long_t),
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.get = s390_compat_regs_high_get,
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.set = s390_compat_regs_high_set,
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},
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};
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static const struct user_regset_view user_s390_compat_view = {
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@ -729,7 +729,7 @@ static void __init setup_hwcaps(void)
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if ((facility_list & (1UL << (31 - 22)))
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&& (facility_list & (1UL << (31 - 30))))
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elf_hwcap |= 1UL << 8;
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elf_hwcap |= HWCAP_S390_ETF3EH;
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/*
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* Check for additional facilities with store-facility-list-extended.
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__stfle(&facility_list_extended, 1) > 0) {
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if ((facility_list_extended & (1ULL << (63 - 42)))
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&& (facility_list_extended & (1ULL << (63 - 44))))
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elf_hwcap |= 1UL << 6;
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elf_hwcap |= HWCAP_S390_DFP;
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}
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/*
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* Huge page support HWCAP_S390_HPAGE is bit 7.
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*/
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if (MACHINE_HAS_HPAGE)
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elf_hwcap |= 1UL << 7;
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elf_hwcap |= HWCAP_S390_HPAGE;
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/*
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* 64-bit register support for 31-bit processes
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* HWCAP_S390_HIGH_GPRS is bit 9.
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*/
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elf_hwcap |= HWCAP_S390_HIGH_GPRS;
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switch (S390_lowcore.cpu_id.machine) {
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case 0x9672:
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@ -361,6 +361,7 @@ typedef struct elf64_shdr {
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#define NT_PPC_VSX 0x102 /* PowerPC VSX registers */
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#define NT_386_TLS 0x200 /* i386 TLS slots (struct user_desc) */
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#define NT_386_IOPERM 0x201 /* x86 io permission bitmap (1=deny) */
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#define NT_PRXSTATUS 0x300 /* s390 upper register halves */
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/* Note header in a PT_NOTE section */
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