summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/signal_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c101
1 files changed, 82 insertions, 19 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index da7c058..65ad925 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -112,11 +112,29 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
#else /* CONFIG_ALTIVEC */
err |= __put_user(0, &sc->v_regs);
#endif /* CONFIG_ALTIVEC */
+ flush_fp_to_thread(current);
+ /* copy fpr regs and fpscr */
+ err |= copy_fpr_to_user(&sc->fp_regs, current);
+#ifdef CONFIG_VSX
+ /*
+ * Copy VSX low doubleword to local buffer for formatting,
+ * then out to userspace. Update v_regs to point after the
+ * VMX data.
+ */
+ if (current->thread.used_vsr) {
+ __giveup_vsx(current);
+ v_regs += ELF_NVRREG;
+ err |= copy_vsx_to_user(v_regs, current);
+ /* set MSR_VSX in the MSR value in the frame to
+ * indicate that sc->vs_reg) contains valid data.
+ */
+ msr |= MSR_VSX;
+ }
+#endif /* CONFIG_VSX */
err |= __put_user(&sc->gp_regs, &sc->regs);
WARN_ON(!FULL_REGS(regs));
err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
- err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
err |= __put_user(signr, &sc->signal);
err |= __put_user(handler, &sc->handler);
if (set != NULL)
@@ -137,29 +155,32 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
#endif
unsigned long err = 0;
unsigned long save_r13 = 0;
- elf_greg_t *gregs = (elf_greg_t *)regs;
unsigned long msr;
+#ifdef CONFIG_VSX
int i;
+#endif
/* If this is not a signal return, we preserve the TLS in r13 */
if (!sig)
save_r13 = regs->gpr[13];
- /* copy everything before MSR */
- err |= __copy_from_user(regs, &sc->gp_regs,
- PT_MSR*sizeof(unsigned long));
-
+ /* copy the GPRs */
+ err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
+ err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
/* get MSR separately, transfer the LE bit if doing signal return */
err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
if (sig)
regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
-
+ err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
+ err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
+ err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
+ err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
+ err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
/* skip SOFTE */
- for (i = PT_MSR+1; i <= PT_RESULT; i++) {
- if (i == PT_SOFTE)
- continue;
- err |= __get_user(gregs[i], &sc->gp_regs[i]);
- }
+ err |= __get_user(regs->trap, &sc->gp_regs[PT_TRAP]);
+ err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
+ err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
+ err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
if (!sig)
regs->gpr[13] = save_r13;
@@ -180,9 +201,7 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
* This has to be done before copying stuff into current->thread.fpr/vr
* for the reasons explained in the previous comment.
*/
- regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC);
-
- err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
+ regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
#ifdef CONFIG_ALTIVEC
err |= __get_user(v_regs, &sc->v_regs);
@@ -202,7 +221,23 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
else
current->thread.vrsave = 0;
#endif /* CONFIG_ALTIVEC */
+ /* restore floating point */
+ err |= copy_fpr_from_user(current, &sc->fp_regs);
+#ifdef CONFIG_VSX
+ /*
+ * Get additional VSX data. Update v_regs to point after the
+ * VMX data. Copy VSX low doubleword from userspace to local
+ * buffer for formatting, then into the taskstruct.
+ */
+ v_regs += ELF_NVRREG;
+ if ((msr & MSR_VSX) != 0)
+ err |= copy_vsx_from_user(current, v_regs);
+ else
+ for (i = 0; i < 32 ; i++)
+ current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
+#else
+#endif
return err;
}
@@ -233,6 +268,13 @@ static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
}
/*
+ * Userspace code may pass a ucontext which doesn't include VSX added
+ * at the end. We need to check for this case.
+ */
+#define UCONTEXTSIZEWITHOUTVSX \
+ (sizeof(struct ucontext) - 32*sizeof(long))
+
+/*
* Handle {get,set,swap}_context operations
*/
int sys_swapcontext(struct ucontext __user *old_ctx,
@@ -241,13 +283,34 @@ int sys_swapcontext(struct ucontext __user *old_ctx,
{
unsigned char tmp;
sigset_t set;
+ unsigned long new_msr = 0;
- /* Context size is for future use. Right now, we only make sure
- * we are passed something we understand
+ if (new_ctx &&
+ __get_user(new_msr, &new_ctx->uc_mcontext.gp_regs[PT_MSR]))
+ return -EFAULT;
+ /*
+ * Check that the context is not smaller than the original
+ * size (with VMX but without VSX)
*/
- if (ctx_size < sizeof(struct ucontext))
+ if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
return -EINVAL;
-
+ /*
+ * If the new context state sets the MSR VSX bits but
+ * it doesn't provide VSX state.
+ */
+ if ((ctx_size < sizeof(struct ucontext)) &&
+ (new_msr & MSR_VSX))
+ return -EINVAL;
+#ifdef CONFIG_VSX
+ /*
+ * If userspace doesn't provide enough room for VSX data,
+ * but current thread has used VSX, we don't have anywhere
+ * to store the full context back into.
+ */
+ if ((ctx_size < sizeof(struct ucontext)) &&
+ (current->thread.used_vsr && old_ctx))
+ return -EINVAL;
+#endif
if (old_ctx != NULL) {
if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
|| setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0)
OpenPOWER on IntegriCloud