8 files changed, 44 insertions, 15 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 12ac277282ba..bcb0c5d2abc2 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -771,7 +771,7 @@ config HIGHMEM
 
 	  If unsure, say Y.
 
-config FORCE_MAX_ZONEORDER
+config ARCH_FORCE_MAX_ORDER
 	int "Maximum zone order"
 	default "11"
 	help
diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index 5097caa7bf0c..bfd8e433ed62 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -55,8 +55,6 @@ KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(vardirs) $(plfdirs))
 
 KBUILD_DEFCONFIG := iss_defconfig
 
-head-y		:= arch/xtensa/kernel/head.o
-
 libs-y		+= arch/xtensa/lib/
 
 boot		:= arch/xtensa/boot
diff --git a/arch/xtensa/include/asm/elf.h b/arch/xtensa/include/asm/elf.h
index 909a6ab4f22b..ffcf1ada19c6 100644
--- a/arch/xtensa/include/asm/elf.h
+++ b/arch/xtensa/include/asm/elf.h
@@ -93,6 +93,10 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 #define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA )  || \
 			    ( (x)->e_machine == EM_XTENSA_OLD ) )
 
+#define ELFOSABI_XTENSA_FDPIC 65
+#define elf_check_fdpic(x) ((x)->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC)
+#define ELF_FDPIC_CORE_EFLAGS 0
+
 /*
  * These are used to set parameters in the core dumps.
  */
@@ -153,10 +157,22 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  */
 
 #define ELF_PLAT_INIT(_r, load_addr) \
-	do { _r->areg[0]=0; /*_r->areg[1]=0;*/ _r->areg[2]=0;  _r->areg[3]=0;  \
-	     _r->areg[4]=0;  _r->areg[5]=0;    _r->areg[6]=0;  _r->areg[7]=0;  \
-	     _r->areg[8]=0;  _r->areg[9]=0;    _r->areg[10]=0; _r->areg[11]=0; \
-	     _r->areg[12]=0; _r->areg[13]=0;   _r->areg[14]=0; _r->areg[15]=0; \
+	do { \
+		(_r)->areg[0]  = 0; /*(_r)->areg[1] = 0;*/ \
+		(_r)->areg[2]  = 0; (_r)->areg[3]  = 0; \
+		(_r)->areg[4]  = 0; (_r)->areg[5]  = 0; \
+		(_r)->areg[6]  = 0; (_r)->areg[7]  = 0; \
+		(_r)->areg[8]  = 0; (_r)->areg[9]  = 0; \
+		(_r)->areg[10] = 0; (_r)->areg[11] = 0; \
+		(_r)->areg[12] = 0; (_r)->areg[13] = 0; \
+		(_r)->areg[14] = 0; (_r)->areg[15] = 0; \
+	} while (0)
+
+#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
+	do { \
+		(_r)->areg[4] = _exec_map_addr; \
+		(_r)->areg[5] = _interp_map_addr; \
+		(_r)->areg[6] = dynamic_addr; \
 	} while (0)
 
 typedef struct {
diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index 5abde43c570c..228e4dff5fb2 100644
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -205,9 +205,12 @@ struct thread_struct {
 #define start_thread(regs, new_pc, new_sp) \
 	do { \
 		unsigned long syscall = (regs)->syscall; \
+		unsigned long current_aregs[16]; \
+		memcpy(current_aregs, (regs)->areg, sizeof(current_aregs)); \
 		memset((regs), 0, sizeof(*(regs))); \
 		(regs)->pc = (new_pc); \
 		(regs)->ps = USER_PS_VALUE; \
+		memcpy((regs)->areg, current_aregs, sizeof(current_aregs)); \
 		(regs)->areg[1] = (new_sp); \
 		(regs)->areg[0] = 0; \
 		(regs)->wmask = 1; \
diff --git a/arch/xtensa/include/uapi/asm/mman.h b/arch/xtensa/include/uapi/asm/mman.h
index 7966a58af472..1ff0c858544f 100644
--- a/arch/xtensa/include/uapi/asm/mman.h
+++ b/arch/xtensa/include/uapi/asm/mman.h
@@ -111,6 +111,8 @@
 
 #define MADV_DONTNEED_LOCKED	24	/* like DONTNEED, but drop locked pages too */
 
+#define MADV_COLLAPSE	25		/* Synchronous hugepage collapse */
+
 /* compatibility flags */
 #define MAP_FILE	0
 
diff --git a/arch/xtensa/include/uapi/asm/ptrace.h b/arch/xtensa/include/uapi/asm/ptrace.h
index 50db3e0a6341..9115e86ebc75 100644
--- a/arch/xtensa/include/uapi/asm/ptrace.h
+++ b/arch/xtensa/include/uapi/asm/ptrace.h
@@ -37,6 +37,10 @@
 #define PTRACE_SETXTREGS	19
 #define PTRACE_GETHBPREGS	20
 #define PTRACE_SETHBPREGS	21
+#define PTRACE_GETFDPIC		22
+
+#define PTRACE_GETFDPIC_EXEC	0
+#define PTRACE_GETFDPIC_INTERP	1
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 897c1c741058..f28b8e3d717e 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -3,9 +3,9 @@
 # Makefile for the Linux/Xtensa kernel.
 #
 
-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds
 
-obj-y := align.o coprocessor.o entry.o irq.o platform.o process.o \
+obj-y := head.o align.o coprocessor.o entry.o irq.o platform.o process.o \
 	 ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
 	 vectors.o
 
diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
index 201356faa7e6..b3c2450d6f23 100644
--- a/arch/xtensa/kernel/syscall.c
+++ b/arch/xtensa/kernel/syscall.c
@@ -58,6 +58,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 		unsigned long len, unsigned long pgoff, unsigned long flags)
 {
 	struct vm_area_struct *vmm;
+	struct vma_iterator vmi;
 
 	if (flags & MAP_FIXED) {
 		/* We do not accept a shared mapping if it would violate
@@ -79,15 +80,20 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	else
 		addr = PAGE_ALIGN(addr);
 
-	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
-		/* At this point:  (!vmm || addr < vmm->vm_end). */
-		if (TASK_SIZE - len < addr)
-			return -ENOMEM;
-		if (!vmm || addr + len <= vm_start_gap(vmm))
-			return addr;
+	vma_iter_init(&vmi, current->mm, addr);
+	for_each_vma(vmi, vmm) {
+		/* At this point:  (addr < vmm->vm_end). */
+		if (addr + len <= vm_start_gap(vmm))
+			break;
+
 		addr = vmm->vm_end;
 		if (flags & MAP_SHARED)
 			addr = COLOUR_ALIGN(addr, pgoff);
 	}
+
+	if (TASK_SIZE - len < addr)
+		return -ENOMEM;
+
+	return addr;
 }
 #endif