1 files changed, 46 insertions, 25 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 75c2d1009985..3386d8ab7eb0 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -858,17 +858,21 @@ void show_regs(struct pt_regs * regs)
         printk("MSR: "REG" ", regs->msr);
         printbits(regs->msr, msr_bits);
         printk("  CR: %08lx  XER: %08lx\n", regs->ccr, regs->xer);
-#ifdef CONFIG_PPC64
-        printk("SOFTE: %ld\n", regs->softe);
-#endif
         trap = TRAP(regs);
         if ((regs->trap != 0xc00) && cpu_has_feature(CPU_FTR_CFAR))
-                printk("CFAR: "REG"\n", regs->orig_gpr3);
-        if (trap == 0x300 || trap == 0x600)
+                printk("CFAR: "REG" ", regs->orig_gpr3);
+        if (trap == 0x200 || trap == 0x300 || trap == 0x600)
 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
-                printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr);
+                printk("DEAR: "REG" ESR: "REG" ", regs->dar, regs->dsisr);
 #else
-                printk("DAR: "REG", DSISR: %08lx\n", regs->dar, regs->dsisr);
+                printk("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr);
+#endif
+#ifdef CONFIG_PPC64
+        printk("SOFTE: %ld ", regs->softe);
+#endif
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+        if (MSR_TM_ACTIVE(regs->msr))
+                printk("\nPACATMSCRATCH: %016llx ", get_paca()->tm_scratch);
 #endif
 
         for (i = 0;  i < 32;  i++) {
@@ -887,9 +891,6 @@ void show_regs(struct pt_regs * regs)
         printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip);
         printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link);
 #endif
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
-        printk("PACATMSCRATCH [%llx]\n", get_paca()->tm_scratch);
-#endif
         show_stack(current, (unsigned long *) regs->gpr[1]);
         if (!user_mode(regs))
                 show_instructions(regs);
@@ -1086,25 +1087,45 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
         regs->msr = MSR_USER;
 #else
         if (!is_32bit_task()) {
-                unsigned long entry, toc;
+                unsigned long entry;
 
-                /* start is a relocated pointer to the function descriptor for
-                 * the elf _start routine.  The first entry in the function
-                 * descriptor is the entry address of _start and the second
-                 * entry is the TOC value we need to use.
-                 */
-                __get_user(entry, (unsigned long __user *)start);
-                __get_user(toc, (unsigned long __user *)start+1);
+                if (is_elf2_task()) {
+                        /* Look ma, no function descriptors! */
+                        entry = start;
 
-                /* Check whether the e_entry function descriptor entries
-                 * need to be relocated before we can use them.
-                 */
-                if (load_addr != 0) {
-                        entry += load_addr;
-                        toc   += load_addr;
+                        /*
+                         * Ulrich says:
+                         *   The latest iteration of the ABI requires that when
+                         *   calling a function (at its global entry point),
+                         *   the caller must ensure r12 holds the entry point
+                         *   address (so that the function can quickly
+                         *   establish addressability).
+                         */
+                        regs->gpr[12] = start;
+                        /* Make sure that's restored on entry to userspace. */
+                        set_thread_flag(TIF_RESTOREALL);
+                } else {
+                        unsigned long toc;
+
+                        /* start is a relocated pointer to the function
+                         * descriptor for the elf _start routine.  The first
+                         * entry in the function descriptor is the entry
+                         * address of _start and the second entry is the TOC
+                         * value we need to use.
+                         */
+                        __get_user(entry, (unsigned long __user *)start);
+                        __get_user(toc, (unsigned long __user *)start+1);
+
+                        /* Check whether the e_entry function descriptor entries
+                         * need to be relocated before we can use them.
+                         */
+                        if (load_addr != 0) {
+                                entry += load_addr;
+                                toc   += load_addr;
+                        }
+                        regs->gpr[2] = toc;
                 }
                 regs->nip = entry;
-                regs->gpr[2] = toc;
                 regs->msr = MSR_USER64;
         } else {
                 regs->nip = start;