--- zzzz-none-000/linux-3.10.107/arch/powerpc/kernel/signal_64.c 2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/powerpc/kernel/signal_64.c 2021-02-04 17:41:59.000000000 +0000
@@ -38,7 +38,6 @@
#include "signal.h"
-#define DEBUG_SIG 0
#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
#define FP_REGS_SIZE sizeof(elf_fpregset_t)
@@ -65,8 +64,8 @@
struct siginfo __user *pinfo;
void __user *puc;
struct siginfo info;
- /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
- char abigap[288];
+ /* New 64 bit little-endian ABI allows redzone of 512 bytes below sp */
+ char abigap[USER_REDZONE_SIZE];
} __attribute__ ((aligned (16)));
static const char fmt32[] = KERN_INFO \
@@ -75,6 +74,19 @@
"%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
/*
+ * This computes a quad word aligned pointer inside the vmx_reserve array
+ * element. For historical reasons sigcontext might not be quad word aligned,
+ * but the location we write the VMX regs to must be. See the comment in
+ * sigcontext for more detail.
+ */
+#ifdef CONFIG_ALTIVEC
+static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
+{
+ return (elf_vrreg_t __user *) (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
+}
+#endif
+
+/*
* Set up the sigcontext for the signal frame.
*/
@@ -91,13 +103,11 @@
* v_regs pointer or not
*/
#ifdef CONFIG_ALTIVEC
- elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
+ elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
#endif
unsigned long msr = regs->msr;
long err = 0;
- flush_fp_to_thread(current);
-
#ifdef CONFIG_ALTIVEC
err |= __put_user(v_regs, &sc->v_regs);
@@ -105,7 +115,8 @@
if (current->thread.used_vr) {
flush_altivec_to_thread(current);
/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
- err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
+ err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
+ 33 * sizeof(vector128));
/* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
* contains valid data.
*/
@@ -114,6 +125,8 @@
/* We always copy to/from vrsave, it's 0 if we don't have or don't
* use altivec.
*/
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ current->thread.vrsave = mfspr(SPRN_VRSAVE);
err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
#else /* CONFIG_ALTIVEC */
err |= __put_user(0, &sc->v_regs);
@@ -181,16 +194,21 @@
* v_regs pointer or not.
*/
#ifdef CONFIG_ALTIVEC
- elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)
- (((unsigned long)sc->vmx_reserve + 15) & ~0xful);
- elf_vrreg_t __user *tm_v_regs = (elf_vrreg_t __user *)
- (((unsigned long)tm_sc->vmx_reserve + 15) & ~0xful);
+ elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
+ elf_vrreg_t __user *tm_v_regs = sigcontext_vmx_regs(tm_sc);
#endif
unsigned long msr = regs->msr;
long err = 0;
BUG_ON(!MSR_TM_ACTIVE(regs->msr));
+ /* Remove TM bits from thread's MSR. The MSR in the sigcontext
+ * just indicates to userland that we were doing a transaction, but we
+ * don't want to return in transactional state. This also ensures
+ * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
+ */
+ regs->msr &= ~MSR_TS_MASK;
+
flush_fp_to_thread(current);
#ifdef CONFIG_ALTIVEC
@@ -201,18 +219,18 @@
if (current->thread.used_vr) {
flush_altivec_to_thread(current);
/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
- err |= __copy_to_user(v_regs, current->thread.vr,
+ err |= __copy_to_user(v_regs, ¤t->thread.vr_state,
33 * sizeof(vector128));
/* If VEC was enabled there are transactional VRs valid too,
* else they're a copy of the checkpointed VRs.
*/
if (msr & MSR_VEC)
err |= __copy_to_user(tm_v_regs,
- current->thread.transact_vr,
+ ¤t->thread.transact_vr,
33 * sizeof(vector128));
else
err |= __copy_to_user(tm_v_regs,
- current->thread.vr,
+ ¤t->thread.vr_state,
33 * sizeof(vector128));
/* set MSR_VEC in the MSR value in the frame to indicate
@@ -223,6 +241,8 @@
/* We always copy to/from vrsave, it's 0 if we don't have or don't
* use altivec.
*/
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ current->thread.vrsave = mfspr(SPRN_VRSAVE);
err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
if (msr & MSR_VEC)
err |= __put_user(current->thread.transact_vrsave,
@@ -352,16 +372,18 @@
if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
return -EFAULT;
/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
- if (v_regs != 0 && (msr & MSR_VEC) != 0)
- err |= __copy_from_user(current->thread.vr, v_regs,
+ if (v_regs != NULL && (msr & MSR_VEC) != 0)
+ err |= __copy_from_user(¤t->thread.vr_state, v_regs,
33 * sizeof(vector128));
else if (current->thread.used_vr)
- memset(current->thread.vr, 0, 33 * sizeof(vector128));
+ memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
/* Always get VRSAVE back */
- if (v_regs != 0)
+ if (v_regs != NULL)
err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
else
current->thread.vrsave = 0;
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ mtspr(SPRN_VRSAVE, current->thread.vrsave);
#endif /* CONFIG_ALTIVEC */
/* restore floating point */
err |= copy_fpr_from_user(current, &sc->fp_regs);
@@ -376,7 +398,7 @@
err |= copy_vsx_from_user(current, v_regs);
else
for (i = 0; i < 32 ; i++)
- current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
+ current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
#endif
return err;
}
@@ -473,18 +495,18 @@
tm_v_regs, 34 * sizeof(vector128)))
return -EFAULT;
/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
- if (v_regs != 0 && tm_v_regs != 0 && (msr & MSR_VEC) != 0) {
- err |= __copy_from_user(current->thread.vr, v_regs,
+ if (v_regs != NULL && tm_v_regs != NULL && (msr & MSR_VEC) != 0) {
+ err |= __copy_from_user(¤t->thread.vr_state, v_regs,
33 * sizeof(vector128));
- err |= __copy_from_user(current->thread.transact_vr, tm_v_regs,
+ err |= __copy_from_user(¤t->thread.transact_vr, tm_v_regs,
33 * sizeof(vector128));
}
else if (current->thread.used_vr) {
- memset(current->thread.vr, 0, 33 * sizeof(vector128));
- memset(current->thread.transact_vr, 0, 33 * sizeof(vector128));
+ memset(¤t->thread.vr_state, 0, 33 * sizeof(vector128));
+ memset(¤t->thread.transact_vr, 0, 33 * sizeof(vector128));
}
/* Always get VRSAVE back */
- if (v_regs != 0 && tm_v_regs != 0) {
+ if (v_regs != NULL && tm_v_regs != NULL) {
err |= __get_user(current->thread.vrsave,
(u32 __user *)&v_regs[33]);
err |= __get_user(current->thread.transact_vrsave,
@@ -494,6 +516,8 @@
current->thread.vrsave = 0;
current->thread.transact_vrsave = 0;
}
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ mtspr(SPRN_VRSAVE, current->thread.vrsave);
#endif /* CONFIG_ALTIVEC */
/* restore floating point */
err |= copy_fpr_from_user(current, &sc->fp_regs);
@@ -511,8 +535,8 @@
err |= copy_transact_vsx_from_user(current, tm_v_regs);
} else {
for (i = 0; i < 32 ; i++) {
- current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
- current->thread.transact_fpr[i][TS_VSRLOWOFFSET] = 0;
+ current->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
+ current->thread.transact_fp.fpr[i][TS_VSRLOWOFFSET] = 0;
}
}
#endif
@@ -657,7 +681,7 @@
#endif
/* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
+ current->restart_block.fn = do_no_restart_syscall;
if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
goto badframe;
@@ -690,10 +714,6 @@
return 0;
badframe:
-#if DEBUG_SIG
- printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
- regs, uc, &uc->uc_mcontext);
-#endif
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
current->comm, current->pid, "rt_sigreturn",
@@ -703,26 +723,19 @@
return 0;
}
-int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+int handle_rt_signal64(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
- /* Handler is *really* a pointer to the function descriptor for
- * the signal routine. The first entry in the function
- * descriptor is the entry address of signal and the second
- * entry is the TOC value we need to use.
- */
- func_descr_t __user *funct_desc_ptr;
struct rt_sigframe __user *frame;
unsigned long newsp = 0;
long err = 0;
- frame = get_sigframe(ka, get_tm_stackpointer(regs), sizeof(*frame), 0);
+ frame = get_sigframe(ksig, get_tm_stackpointer(regs), sizeof(*frame), 0);
if (unlikely(frame == NULL))
goto badframe;
err |= __put_user(&frame->info, &frame->pinfo);
err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, info);
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);
if (err)
goto badframe;
@@ -737,15 +750,15 @@
err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
&frame->uc_transact.uc_mcontext,
- regs, signr,
+ regs, ksig->sig,
NULL,
- (unsigned long)ka->sa.sa_handler);
+ (unsigned long)ksig->ka.sa.sa_handler);
} else
#endif
{
err |= __put_user(0, &frame->uc.uc_link);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr,
- NULL, (unsigned long)ka->sa.sa_handler,
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, ksig->sig,
+ NULL, (unsigned long)ksig->ka.sa.sa_handler,
1);
}
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
@@ -753,14 +766,7 @@
goto badframe;
/* Make sure signal handler doesn't get spurious FP exceptions */
- current->thread.fpscr.val = 0;
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- /* Remove TM bits from thread's MSR. The MSR in the sigcontext
- * just indicates to userland that we were doing a transaction, but we
- * don't want to return in transactional state:
- */
- regs->msr &= ~MSR_TS_MASK;
-#endif
+ current->thread.fp_state.fpscr = 0;
/* Set up to return from userspace. */
if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
@@ -771,21 +777,35 @@
goto badframe;
regs->link = (unsigned long) &frame->tramp[0];
}
- funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
/* Allocate a dummy caller frame for the signal handler. */
newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
/* Set up "regs" so we "return" to the signal handler. */
- err |= get_user(regs->nip, &funct_desc_ptr->entry);
- /* enter the signal handler in big-endian mode */
+ if (is_elf2_task()) {
+ regs->nip = (unsigned long) ksig->ka.sa.sa_handler;
+ regs->gpr[12] = regs->nip;
+ } else {
+ /* Handler is *really* a pointer to the function descriptor for
+ * the signal routine. The first entry in the function
+ * descriptor is the entry address of signal and the second
+ * entry is the TOC value we need to use.
+ */
+ func_descr_t __user *funct_desc_ptr =
+ (func_descr_t __user *) ksig->ka.sa.sa_handler;
+
+ err |= get_user(regs->nip, &funct_desc_ptr->entry);
+ err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
+ }
+
+ /* enter the signal handler in native-endian mode */
regs->msr &= ~MSR_LE;
+ regs->msr |= (MSR_KERNEL & MSR_LE);
regs->gpr[1] = newsp;
- err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
- regs->gpr[3] = signr;
+ regs->gpr[3] = ksig->sig;
regs->result = 0;
- if (ka->sa.sa_flags & SA_SIGINFO) {
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
regs->gpr[6] = (unsigned long) frame;
@@ -795,18 +815,13 @@
if (err)
goto badframe;
- return 1;
+ return 0;
badframe:
-#if DEBUG_SIG
- printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
- regs, frame, newsp);
-#endif
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
current->comm, current->pid, "setup_rt_frame",
(long)frame, regs->nip, regs->link);
- force_sigsegv(signr, current);
- return 0;
+ return 1;
}