Merge branch 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / signal_64.c

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index da7c058e3731ffc712367f7f2f4e01e572d0055d..c6a8f2326b6f246fc077b25c2b7b1d9460f9e6cc 100644 (file)
--- 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 +221,21 @@ 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;
+#endif
        return err;
 }
 
@@ -232,6 +265,13 @@ static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
        return err;
 }
 
+/*
+ * 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
  */
@@ -241,13 +281,34 @@ 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)