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-rw-r--r--arch/frv/kernel/gdb-stub.c12
-rw-r--r--arch/h8300/kernel/syscalls.S78
-rw-r--r--arch/i386/kernel/syscall_table.S3
-rw-r--r--arch/m32r/Kconfig4
-rw-r--r--arch/m32r/mm/mmu.S22
-rw-r--r--arch/powerpc/kernel/irq.c2
-rw-r--r--arch/powerpc/kernel/swsusp.c4
-rw-r--r--arch/powerpc/platforms/cell/pervasive.c6
-rw-r--r--arch/um/Kconfig3
-rw-r--r--arch/um/defconfig2
-rw-r--r--arch/um/include/common-offsets.h2
-rw-r--r--arch/um/include/kern_util.h3
-rw-r--r--arch/um/include/os.h1
-rw-r--r--arch/um/kernel/dyn.lds.S2
-rw-r--r--arch/um/kernel/init_task.c30
-rw-r--r--arch/um/kernel/irq.c115
-rw-r--r--arch/um/kernel/skas/process.c4
-rw-r--r--arch/um/kernel/tt/exec_kern.c2
-rw-r--r--arch/um/kernel/tt/process_kern.c2
-rw-r--r--arch/um/kernel/um_arch.c2
-rw-r--r--arch/um/kernel/uml.lds.S2
-rw-r--r--arch/um/os-Linux/signal.c50
-rw-r--r--arch/um/os-Linux/skas/process.c13
-rw-r--r--arch/um/os-Linux/sys-i386/signal.c8
-rw-r--r--arch/um/os-Linux/sys-x86_64/signal.c6
-rw-r--r--arch/um/os-Linux/util.c23
-rw-r--r--arch/x86_64/ia32/ia32entry.S3
-rw-r--r--arch/x86_64/kernel/head64.c7
28 files changed, 290 insertions, 121 deletions
diff --git a/arch/frv/kernel/gdb-stub.c b/arch/frv/kernel/gdb-stub.c
index 9550f37fb62..1e7a101cbf4 100644
--- a/arch/frv/kernel/gdb-stub.c
+++ b/arch/frv/kernel/gdb-stub.c
@@ -1195,7 +1195,7 @@ static void gdbstub_check_breakpoint(void)
/*
*
*/
-static void __attribute__((unused)) gdbstub_show_regs(void)
+static void __maybe_unused gdbstub_show_regs(void)
{
unsigned long *reg;
int loop;
@@ -1223,7 +1223,7 @@ static void __attribute__((unused)) gdbstub_show_regs(void)
/*
* dump debugging regs
*/
-static void __attribute__((unused)) gdbstub_dump_debugregs(void)
+static void __maybe_unused gdbstub_dump_debugregs(void)
{
gdbstub_printk("DCR %08lx ", __debug_status.dcr);
gdbstub_printk("BRR %08lx\n", __debug_status.brr);
@@ -2079,25 +2079,25 @@ void gdbstub_exit(int status)
* GDB wants to call malloc() and free() to allocate memory for calling kernel
* functions directly from its command line
*/
-static void *malloc(size_t size) __attribute__((unused));
+static void *malloc(size_t size) __maybe_unused;
static void *malloc(size_t size)
{
return kmalloc(size, GFP_ATOMIC);
}
-static void free(void *p) __attribute__((unused));
+static void free(void *p) __maybe_unused;
static void free(void *p)
{
kfree(p);
}
-static uint32_t ___get_HSR0(void) __attribute__((unused));
+static uint32_t ___get_HSR0(void) __maybe_unused;
static uint32_t ___get_HSR0(void)
{
return __get_HSR(0);
}
-static uint32_t ___set_HSR0(uint32_t x) __attribute__((unused));
+static uint32_t ___set_HSR0(uint32_t x) __maybe_unused;
static uint32_t ___set_HSR0(uint32_t x)
{
__set_HSR(0, x);
diff --git a/arch/h8300/kernel/syscalls.S b/arch/h8300/kernel/syscalls.S
index dab98fd99e6..54e21c3f205 100644
--- a/arch/h8300/kernel/syscalls.S
+++ b/arch/h8300/kernel/syscalls.S
@@ -31,7 +31,7 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_mknod)
.long SYMBOL_NAME(sys_chmod) /* 15 */
.long SYMBOL_NAME(sys_chown16)
- .long SYMBOL_NAME(sys_ni_syscall) /* old break syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old break syscall holder */
.long SYMBOL_NAME(sys_stat)
.long SYMBOL_NAME(sys_lseek)
.long SYMBOL_NAME(sys_getpid) /* 20 */
@@ -45,11 +45,11 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_fstat)
.long SYMBOL_NAME(sys_pause)
.long SYMBOL_NAME(sys_utime) /* 30 */
- .long SYMBOL_NAME(sys_ni_syscall) /* old stty syscall holder */
- .long SYMBOL_NAME(sys_ni_syscall) /* old gtty syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old stty syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old gtty syscall holder */
.long SYMBOL_NAME(sys_access)
.long SYMBOL_NAME(sys_nice)
- .long SYMBOL_NAME(sys_ni_syscall) /* 35 */ /* old ftime syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* 35 old ftime syscall holder */
.long SYMBOL_NAME(sys_sync)
.long SYMBOL_NAME(sys_kill)
.long SYMBOL_NAME(sys_rename)
@@ -58,7 +58,7 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_dup)
.long SYMBOL_NAME(sys_pipe)
.long SYMBOL_NAME(sys_times)
- .long SYMBOL_NAME(sys_ni_syscall) /* old prof syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old prof syscall holder */
.long SYMBOL_NAME(sys_brk) /* 45 */
.long SYMBOL_NAME(sys_setgid16)
.long SYMBOL_NAME(sys_getgid16)
@@ -66,13 +66,13 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_geteuid16)
.long SYMBOL_NAME(sys_getegid16) /* 50 */
.long SYMBOL_NAME(sys_acct)
- .long SYMBOL_NAME(sys_umount) /* recycled never used phys() */
- .long SYMBOL_NAME(sys_ni_syscall) /* old lock syscall holder */
+ .long SYMBOL_NAME(sys_umount) /* recycled never used phys() */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old lock syscall holder */
.long SYMBOL_NAME(sys_ioctl)
.long SYMBOL_NAME(sys_fcntl) /* 55 */
- .long SYMBOL_NAME(sys_ni_syscall) /* old mpx syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old mpx syscall holder */
.long SYMBOL_NAME(sys_setpgid)
- .long SYMBOL_NAME(sys_ni_syscall) /* old ulimit syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old ulimit syscall holder */
.long SYMBOL_NAME(sys_ni_syscall)
.long SYMBOL_NAME(sys_umask) /* 60 */
.long SYMBOL_NAME(sys_chroot)
@@ -112,7 +112,7 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_fchown16) /* 95 */
.long SYMBOL_NAME(sys_getpriority)
.long SYMBOL_NAME(sys_setpriority)
- .long SYMBOL_NAME(sys_ni_syscall) /* old profil syscall holder */
+ .long SYMBOL_NAME(sys_ni_syscall) /* old profil syscall holder */
.long SYMBOL_NAME(sys_statfs)
.long SYMBOL_NAME(sys_fstatfs) /* 100 */
.long SYMBOL_NAME(sys_ni_syscall) /* ioperm for i386 */
@@ -202,8 +202,8 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_capset) /* 185 */
.long SYMBOL_NAME(sys_sigaltstack)
.long SYMBOL_NAME(sys_sendfile)
- .long SYMBOL_NAME(sys_ni_syscall) /* streams1 */
- .long SYMBOL_NAME(sys_ni_syscall) /* streams2 */
+ .long SYMBOL_NAME(sys_ni_syscall) /* streams1 */
+ .long SYMBOL_NAME(sys_ni_syscall) /* streams2 */
.long SYMBOL_NAME(sys_vfork) /* 190 */
.long SYMBOL_NAME(sys_getrlimit)
.long SYMBOL_NAME(sys_mmap2)
@@ -236,10 +236,10 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_ni_syscall)
.long SYMBOL_NAME(sys_getdents64) /* 220 */
.long SYMBOL_NAME(sys_fcntl64)
- .long SYMBOL_NAME(sys_ni_syscall) /* reserved for TUX */
- .long SYMBOL_NAME(sys_ni_syscall)
+ .long SYMBOL_NAME(sys_ni_syscall) /* reserved TUX */
+ .long SYMBOL_NAME(sys_ni_syscall) /* reserved Security */
.long SYMBOL_NAME(sys_gettid)
- .long SYMBOL_NAME(sys_ni_syscall) /* 225 */ /* sys_readahead */
+ .long SYMBOL_NAME(sys_readahead) /* 225 */
.long SYMBOL_NAME(sys_setxattr)
.long SYMBOL_NAME(sys_lsetxattr)
.long SYMBOL_NAME(sys_fsetxattr)
@@ -257,8 +257,8 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_futex) /* 240 */
.long SYMBOL_NAME(sys_sched_setaffinity)
.long SYMBOL_NAME(sys_sched_getaffinity)
- .long SYMBOL_NAME(sys_ni_syscall) /* sys_set_thread_area */
- .long SYMBOL_NAME(sys_ni_syscall) /* sys_get_thread_area */
+ .long SYMBOL_NAME(sys_ni_syscall)
+ .long SYMBOL_NAME(sys_ni_syscall)
.long SYMBOL_NAME(sys_io_setup) /* 245 */
.long SYMBOL_NAME(sys_io_destroy)
.long SYMBOL_NAME(sys_io_getevents)
@@ -288,8 +288,8 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_utimes)
.long SYMBOL_NAME(sys_fadvise64_64)
.long SYMBOL_NAME(sys_ni_syscall) /* sys_vserver */
- .long SYMBOL_NAME(sys_mbind)
- .long SYMBOL_NAME(sys_get_mempolicy)
+ .long SYMBOL_NAME(sys_ni_syscall)
+ .long SYMBOL_NAME(sys_get_mempolicy) /* 275 */
.long SYMBOL_NAME(sys_set_mempolicy)
.long SYMBOL_NAME(sys_mq_open)
.long SYMBOL_NAME(sys_mq_unlink)
@@ -297,16 +297,42 @@ SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_mq_timedreceive) /* 280 */
.long SYMBOL_NAME(sys_mq_notify)
.long SYMBOL_NAME(sys_mq_getsetattr)
- .long SYMBOL_NAME(sys_ni_syscall) /* reserved for kexec */
.long SYMBOL_NAME(sys_waitid)
- .long SYMBOL_NAME(sys_ni_syscall) /* 285 */ /* available */
- .long SYMBOL_NAME(sys_add_key)
+ .long SYMBOL_NAME(sys_ni_syscall) /* sys_kexec_load */
+ .long SYMBOL_NAME(sys_add_key) /* 285 */
.long SYMBOL_NAME(sys_request_key)
.long SYMBOL_NAME(sys_keyctl)
-
- .rept NR_syscalls-(.-SYMBOL_NAME(sys_call_table))/4
- .long SYMBOL_NAME(sys_ni_syscall)
- .endr
+ .long SYMBOL_NAME(sys_ioprio_set)
+ .long SYMBOL_NAME(sys_ioprio_get) /* 290 */
+ .long SYMBOL_NAME(sys_inotify_init)
+ .long SYMBOL_NAME(sys_inotify_add_watch)
+ .long SYMBOL_NAME(sys_inotify_rm_watch)
+ .long SYMBOL_NAME(sys_migrate_pages)
+ .long SYMBOL_NAME(sys_openat) /* 295 */
+ .long SYMBOL_NAME(sys_mkdirat)
+ .long SYMBOL_NAME(sys_mknodat)
+ .long SYMBOL_NAME(sys_fchownat)
+ .long SYMBOL_NAME(sys_futimesat)
+ .long SYMBOL_NAME(sys_fstatat64) /* 300 */
+ .long SYMBOL_NAME(sys_unlinkat)
+ .long SYMBOL_NAME(sys_renameat)
+ .long SYMBOL_NAME(sys_linkat)
+ .long SYMBOL_NAME(sys_symlinkat)
+ .long SYMBOL_NAME(sys_readlinkat) /* 305 */
+ .long SYMBOL_NAME(sys_fchmodat)
+ .long SYMBOL_NAME(sys_faccessat)
+ .long SYMBOL_NAME(sys_ni_syscall) /* sys_pselect6 */
+ .long SYMBOL_NAME(sys_ni_syscall) /* sys_ppoll */
+ .long SYMBOL_NAME(sys_unshare) /* 310 */
+ .long SYMBOL_NAME(sys_set_robust_list)
+ .long SYMBOL_NAME(sys_get_robust_list)
+ .long SYMBOL_NAME(sys_splice)
+ .long SYMBOL_NAME(sys_sync_file_range)
+ .long SYMBOL_NAME(sys_tee) /* 315 */
+ .long SYMBOL_NAME(sys_vmsplice)
+ .long SYMBOL_NAME(sys_ni_syscall) /* sys_move_pages */
+ .long SYMBOL_NAME(sys_getcpu)
+ .long SYMBOL_NAME(sys_ni_syscall) /* sys_epoll_pwait */
.macro call_sp addr
mov.l #SYMBOL_NAME(\addr),er6
diff --git a/arch/i386/kernel/syscall_table.S b/arch/i386/kernel/syscall_table.S
index 0772678ceec..bf6adce5226 100644
--- a/arch/i386/kernel/syscall_table.S
+++ b/arch/i386/kernel/syscall_table.S
@@ -320,3 +320,6 @@ ENTRY(sys_call_table)
.long sys_getcpu
.long sys_epoll_pwait
.long sys_utimensat /* 320 */
+ .long sys_signalfd
+ .long sys_timerfd
+ .long sys_eventfd
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 9740d6b8ae1..c3bb8a755b0 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -241,6 +241,10 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config SCHED_NO_NO_OMIT_FRAME_POINTER
+ bool
+ default y
+
config PREEMPT
bool "Preemptible Kernel"
help
diff --git a/arch/m32r/mm/mmu.S b/arch/m32r/mm/mmu.S
index 8bb74b10dca..49a6d16a3d5 100644
--- a/arch/m32r/mm/mmu.S
+++ b/arch/m32r/mm/mmu.S
@@ -163,7 +163,8 @@ ENTRY(tme_handler)
; pte_data = (unsigned long)pte_val(*pte);
ld r2, @r3 ; r2: pte data
- or3 r2, r2, #2 ; _PAGE_PRESENT(=2)
+ and3 r3, r2, #2 ; _PAGE_PRESENT(=2) check
+ beqz r3, 3f
.fillinsn
5:
@@ -264,11 +265,8 @@ ENTRY(tme_handler)
;
and3 r1, r1, #0xeff
ldi r4, #611 ; _KERNPG_TABLE(=611)
- beq r1, r4, 4f ; !pmd_bad(*pmd) ?
- .fillinsn
-3:
- ldi r1, #0 ; r1: pte_data = 0
- bra 5f
+ bne r1, r4, 3f ; !pmd_bad(*pmd) ?
+
.fillinsn
4:
; pte = pte_offset(pmd, address);
@@ -282,8 +280,10 @@ ENTRY(tme_handler)
add r4, r3 ; r4: pte
; pte_data = (unsigned long)pte_val(*pte);
ld r1, @r4 ; r1: pte_data
- .fillinsn
+ and3 r3, r1, #2 ; _PAGE_PRESENT(=2) check
+ beqz r3, 3f
+ .fillinsn
;; set tlb
; r0: address, r1: pte_data, r2: entry
; r3,r4: (free)
@@ -295,8 +295,7 @@ ENTRY(tme_handler)
and3 r4, r4, #(MMU_CONTEXT_ASID_MASK)
or r3, r4
st r3, @r2
- or3 r4, r1, #2 ; _PAGE_PRESENT(=2)
- st r4, @(4,r2) ; set_tlb_data(entry, pte_data);
+ st r1, @(4,r2) ; set_tlb_data(entry, pte_data);
ld r4, @sp+
ld r3, @sp+
@@ -306,6 +305,11 @@ ENTRY(tme_handler)
ld sp, @sp+
rte
+ .fillinsn
+3:
+ ldi r1, #2 ; r1: pte_data = 0 | _PAGE_PRESENT(=2)
+ bra 5b
+
#else
#error unknown isa configuration
#endif
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 9ed4931af16..068377a2a8d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -173,7 +173,7 @@ void local_irq_restore(unsigned long en)
lv1_get_version_info(&tmp);
}
- hard_irq_enable();
+ __hard_irq_enable();
}
#endif /* CONFIG_PPC64 */
diff --git a/arch/powerpc/kernel/swsusp.c b/arch/powerpc/kernel/swsusp.c
index 064a7ba4f02..77b7b34b595 100644
--- a/arch/powerpc/kernel/swsusp.c
+++ b/arch/powerpc/kernel/swsusp.c
@@ -36,8 +36,4 @@ void restore_processor_state(void)
#ifdef CONFIG_PPC32
set_context(current->active_mm->context.id, current->active_mm->pgd);
#endif
-
-#ifdef CONFIG_PPC64
- hard_irq_enable();
-#endif
}
diff --git a/arch/powerpc/platforms/cell/pervasive.c b/arch/powerpc/platforms/cell/pervasive.c
index 8c20f0fb865..812bf563ed6 100644
--- a/arch/powerpc/platforms/cell/pervasive.c
+++ b/arch/powerpc/platforms/cell/pervasive.c
@@ -43,12 +43,10 @@ static void cbe_power_save(void)
unsigned long ctrl, thread_switch_control;
/*
- * We need to hard disable interrupts, but we also need to mark them
- * hard disabled in the PACA so that the local_irq_enable() done by
- * our caller upon return propertly hard enables.
+ * We need to hard disable interrupts, the local_irq_enable() done by
+ * our caller upon return will hard re-enable.
*/
hard_irq_disable();
- get_paca()->hard_enabled = 0;
ctrl = mfspr(SPRN_CTRLF);
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index b9c0f307a8f..c504312219b 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -277,7 +277,8 @@ config HIGHMEM
config KERNEL_STACK_ORDER
int "Kernel stack size order"
- default 2
+ default 1 if 64BIT
+ default 0 if !64BIT
help
This option determines the size of UML kernel stacks. They will
be 1 << order pages. The default is OK unless you're running Valgrind
diff --git a/arch/um/defconfig b/arch/um/defconfig
index f938fa82214..a54d0efecae 100644
--- a/arch/um/defconfig
+++ b/arch/um/defconfig
@@ -86,7 +86,7 @@ CONFIG_MCONSOLE=y
# CONFIG_MAGIC_SYSRQ is not set
CONFIG_NEST_LEVEL=0
# CONFIG_HIGHMEM is not set
-CONFIG_KERNEL_STACK_ORDER=2
+CONFIG_KERNEL_STACK_ORDER=0
CONFIG_UML_REAL_TIME_CLOCK=y
#
diff --git a/arch/um/include/common-offsets.h b/arch/um/include/common-offsets.h
index 5593a802708..541f4a8ca51 100644
--- a/arch/um/include/common-offsets.h
+++ b/arch/um/include/common-offsets.h
@@ -28,3 +28,5 @@ DEFINE(UM_NR_CPUS, NR_CPUS);
/* For crypto assembler code. */
DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
+
+DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 50a49691e0e..8d7f7c1cb9c 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -117,4 +117,7 @@ extern void sigio_handler(int sig, union uml_pt_regs *regs);
extern void copy_sc(union uml_pt_regs *regs, void *from);
+unsigned long to_irq_stack(int sig, unsigned long *mask_out);
+unsigned long from_irq_stack(int nested);
+
#endif
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 688d181b5f8..4d9fb26387d 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -272,7 +272,6 @@ extern void do_longjmp(void *p, int val);
/* util.c */
extern void stack_protections(unsigned long address);
-extern void task_protections(unsigned long address);
extern int raw(int fd);
extern void setup_machinename(char *machine_out);
extern void setup_hostinfo(char *buf, int len);
diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S
index e36f92b463c..87a4e4427d8 100644
--- a/arch/um/kernel/dyn.lds.S
+++ b/arch/um/kernel/dyn.lds.S
@@ -97,6 +97,8 @@ SECTIONS
.data : {
. = ALIGN(KERNEL_STACK_SIZE); /* init_task */
*(.data.init_task)
+ . = ALIGN(KERNEL_STACK_SIZE);
+ *(.data.init_irqstack)
*(.data .data.* .gnu.linkonce.d.*)
SORT(CONSTRUCTORS)
}
diff --git a/arch/um/kernel/init_task.c b/arch/um/kernel/init_task.c
index cda91aa8e70..d4f1d1ab252 100644
--- a/arch/um/kernel/init_task.c
+++ b/arch/um/kernel/init_task.c
@@ -1,5 +1,5 @@
-/*
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,intel.linux}.com)
* Licensed under the GPL
*/
@@ -33,28 +33,20 @@ EXPORT_SYMBOL(init_task);
/*
* Initial thread structure.
*
- * We need to make sure that this is 16384-byte aligned due to the
+ * We need to make sure that this is aligned due to the
* way process stacks are handled. This is done by having a special
* "init_task" linker map entry..
*/
-union thread_union init_thread_union
-__attribute__((__section__(".data.init_task"))) =
-{ INIT_THREAD_INFO(init_task) };
+union thread_union init_thread_union
+ __attribute__((__section__(".data.init_task"))) =
+ { INIT_THREAD_INFO(init_task) };
+
+union thread_union cpu0_irqstack
+ __attribute__((__section__(".data.init_irqstack"))) =
+ { INIT_THREAD_INFO(init_task) };
void unprotect_stack(unsigned long stack)
{
- os_protect_memory((void *) stack, (1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE,
- 1, 1, 0);
+ os_protect_memory((void *) stack, THREAD_SIZE, 1, 1, 0);
}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 8f2ed369031..dba04d88b43 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -1,4 +1,4 @@
-/*
+/*
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
* Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
@@ -32,6 +32,7 @@
#include "sigio.h"
#include "um_malloc.h"
#include "misc_constants.h"
+#include "as-layout.h"
/*
* Generic, controller-independent functions:
@@ -53,7 +54,7 @@ int show_interrupts(struct seq_file *p, void *v)
if (i < NR_IRQS) {
spin_lock_irqsave(&irq_desc[i].lock, flags);
action = irq_desc[i].action;
- if (!action)
+ if (!action)
goto skip;
seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
@@ -468,3 +469,113 @@ int init_aio_irq(int irq, char *name, irq_handler_t handler)
out:
return err;
}
+
+/*
+ * IRQ stack entry and exit:
+ *
+ * Unlike i386, UML doesn't receive IRQs on the normal kernel stack
+ * and switch over to the IRQ stack after some preparation. We use
+ * sigaltstack to receive signals on a separate stack from the start.
+ * These two functions make sure the rest of the kernel won't be too
+ * upset by being on a different stack. The IRQ stack has a
+ * thread_info structure at the bottom so that current et al continue
+ * to work.
+ *
+ * to_irq_stack copies the current task's thread_info to the IRQ stack
+ * thread_info and sets the tasks's stack to point to the IRQ stack.
+ *
+ * from_irq_stack copies the thread_info struct back (flags may have
+ * been modified) and resets the task's stack pointer.
+ *
+ * Tricky bits -
+ *
+ * What happens when two signals race each other? UML doesn't block
+ * signals with sigprocmask, SA_DEFER, or sa_mask, so a second signal
+ * could arrive while a previous one is still setting up the
+ * thread_info.
+ *
+ * There are three cases -
+ * The first interrupt on the stack - sets up the thread_info and
+ * handles the interrupt
+ * A nested interrupt interrupting the copying of the thread_info -
+ * can't handle the interrupt, as the stack is in an unknown state
+ * A nested interrupt not interrupting the copying of the
+ * thread_info - doesn't do any setup, just handles the interrupt
+ *
+ * The first job is to figure out whether we interrupted stack setup.
+ * This is done by xchging the signal mask with thread_info->pending.
+ * If the value that comes back is zero, then there is no setup in
+ * progress, and the interrupt can be handled. If the value is
+ * non-zero, then there is stack setup in progress. In order to have
+ * the interrupt handled, we leave our signal in the mask, and it will
+ * be handled by the upper handler after it has set up the stack.
+ *
+ * Next is to figure out whether we are the outer handler or a nested
+ * one. As part of setting up the stack, thread_info->real_thread is
+ * set to non-NULL (and is reset to NULL on exit). This is the
+ * nesting indicator. If it is non-NULL, then the stack is already
+ * set up and the handler can run.
+ */
+
+static unsigned long pending_mask;
+
+unsigned long to_irq_stack(int sig, unsigned long *mask_out)
+{
+ struct thread_info *ti;
+ unsigned long mask, old;
+ int nested;
+
+ mask = xchg(&pending_mask, 1 << sig);
+ if(mask != 0){
+ /* If any interrupts come in at this point, we want to
+ * make sure that their bits aren't lost by our
+ * putting our bit in. So, this loop accumulates bits
+ * until xchg returns the same value that we put in.
+ * When that happens, there were no new interrupts,
+ * and pending_mask contains a bit for each interrupt
+ * that came in.
+ */
+ old = 1 << sig;
+ do {
+ old |= mask;
+ mask = xchg(&pending_mask, old);
+ } while(mask != old);
+ return 1;
+ }
+
+ ti = current_thread_info();
+ nested = (ti->real_thread != NULL);
+ if(!nested){
+ struct task_struct *task;
+ struct thread_info *tti;
+
+ task = cpu_tasks[ti->cpu].task;
+ tti = task_thread_info(task);
+ *ti = *tti;
+ ti->real_thread = tti;
+ task->stack = ti;
+ }
+
+ mask = xchg(&pending_mask, 0);
+ *mask_out |= mask | nested;
+ return 0;
+}
+
+unsigned long from_irq_stack(int nested)
+{
+ struct thread_info *ti, *to;
+ unsigned long mask;
+
+ ti = current_thread_info();
+
+ pending_mask = 1;
+
+ to = ti->real_thread;
+ current->stack = to;
+ ti->real_thread = NULL;
+ *to = *ti;
+
+ mask = xchg(&pending_mask, 0);
+ return mask & ~1;
+}
+
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index a96ae1a0610..2a69a7ce579 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -163,8 +163,12 @@ static int start_kernel_proc(void *unused)
extern int userspace_pid[];
+extern char cpu0_irqstack[];
+
int start_uml_skas(void)
{
+ stack_protections((unsigned long) &cpu0_irqstack);
+ set_sigstack(cpu0_irqstack, THREAD_SIZE);
if(proc_mm)
userspace_pid[0] = start_userspace(0);
diff --git a/arch/um/kernel/tt/exec_kern.c b/arch/um/kernel/tt/exec_kern.c
index 98e21743e60..40126cb5180 100644
--- a/arch/um/kernel/tt/exec_kern.c
+++ b/arch/um/kernel/tt/exec_kern.c
@@ -57,7 +57,7 @@ void flush_thread_tt(void)
enable_timer();
free_page(stack);
protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
- task_protections((unsigned long) current_thread);
+ stack_protections((unsigned long) current_thread);
force_flush_all();
unblock_signals();
}
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
index c631303cb80..74347adf81b 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -209,7 +209,7 @@ void finish_fork_handler(int sig)
if(current->mm != current->parent->mm)
protect_memory(uml_reserved, high_physmem - uml_reserved, 1,
1, 0, 1);
- task_protections((unsigned long) current_thread);
+ stack_protections((unsigned long) current_thread);
free_page(current->thread.temp_stack);
local_irq_disable();
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 1cf954a47fd..ecc458fe51b 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -459,7 +459,7 @@ int __init linux_main(int argc, char **argv)
uml_postsetup();
- task_protections((unsigned long) &init_thread_info);
+ stack_protections((unsigned long) &init_thread_info);
os_flush_stdout();
return CHOOSE_MODE(start_uml_tt(), start_uml_skas());
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index f6301274cf3..bc59f97e34d 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -59,6 +59,8 @@ SECTIONS
{
. = ALIGN(KERNEL_STACK_SIZE); /* init_task */
*(.data.init_task)
+ . = ALIGN(KERNEL_STACK_SIZE);
+ *(.data.init_irqstack)
*(.data)
*(.gnu.linkonce.d*)
CONSTRUCTORS
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 48d49341530..18e5c8b67eb 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -61,15 +61,19 @@ void sig_handler(int sig, struct sigcontext *sc)
static void real_alarm_handler(int sig, struct sigcontext *sc)
{
+ union uml_pt_regs regs;
+
if(sig == SIGALRM)
switch_timers(0);
- CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas,
- sig, sc);
+ if(sc != NULL)
+ copy_sc(&regs, sc);
+ regs.skas.is_user = 0;
+ unblock_signals();
+ timer_handler(sig, &regs);
if(sig == SIGALRM)
switch_timers(1);
-
}
void alarm_handler(int sig, struct sigcontext *sc)
@@ -113,6 +117,46 @@ void remove_sigstack(void)
void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
+void handle_signal(int sig, struct sigcontext *sc)
+{
+ unsigned long pending = 0;
+
+ do {
+ int nested, bail;
+
+ /*
+ * pending comes back with one bit set for each
+ * interrupt that arrived while setting up the stack,
+ * plus a bit for this interrupt, plus the zero bit is
+ * set if this is a nested interrupt.
+ * If bail is true, then we interrupted another
+ * handler setting up the stack. In this case, we
+ * have to return, and the upper handler will deal
+ * with this interrupt.
+ */
+ bail = to_irq_stack(sig, &pending);
+ if(bail)
+ return;
+
+ nested = pending & 1;
+ pending &= ~1;
+
+ while((sig = ffs(pending)) != 0){
+ sig--;
+ pending &= ~(1 << sig);
+ (*handlers[sig])(sig, sc);
+ }
+
+ /* Again, pending comes back with a mask of signals
+ * that arrived while tearing down the stack. If this
+ * is non-zero, we just go back, set up the stack
+ * again, and handle the new interrupts.
+ */
+ if(!nested)
+ pending = from_irq_stack(nested);
+ } while(pending);
+}
+
extern void hard_handler(int sig);
void set_handler(int sig, void (*handler)(int), int flags, ...)
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 6a0e466d01e..f9d2f8545af 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -288,7 +288,8 @@ int start_userspace(unsigned long stub_stack)
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
- int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
+ /* To prevent races if using_sysemu changes under us.*/
+ int local_using_sysemu;
while(1){
restore_registers(pid, regs);
@@ -296,7 +297,8 @@ void userspace(union uml_pt_regs *regs)
/* Now we set local_using_sysemu to be used for one loop */
local_using_sysemu = get_using_sysemu();
- op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
+ op = SELECT_PTRACE_OPERATION(local_using_sysemu,
+ singlestepping(NULL));
err = ptrace(op, pid, 0, 0);
if(err)
@@ -490,8 +492,8 @@ void map_stub_pages(int fd, unsigned long code,
void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
{
(*buf)[0].JB_IP = (unsigned long) handler;
- (*buf)[0].JB_SP = (unsigned long) stack +
- (PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) - sizeof(void *);
+ (*buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE -
+ sizeof(void *);
}
#define INIT_JMP_NEW_THREAD 0
@@ -533,8 +535,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
case INIT_JMP_NEW_THREAD:
(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
(*switch_buf)[0].JB_SP = (unsigned long) stack +
- (PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) -
- sizeof(void *);
+ UM_THREAD_SIZE - sizeof(void *);
break;
case INIT_JMP_CALLBACK:
(*cb_proc)(cb_arg);
diff --git a/arch/um/os-Linux/sys-i386/signal.c b/arch/um/os-Linux/sys-i386/signal.c
index 0d3eae51835..f311609f93d 100644
--- a/arch/um/os-Linux/sys-i386/signal.c
+++ b/arch/um/os-Linux/sys-i386/signal.c
@@ -1,15 +1,13 @@
/*
- * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
+ * Copyright (C) 2006 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <signal.h>
-extern void (*handlers[])(int sig, struct sigcontext *sc);
+extern void handle_signal(int sig, struct sigcontext *sc);
void hard_handler(int sig)
{
- struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
-
- (*handlers[sig])(sig, sc);
+ handle_signal(sig, (struct sigcontext *) (&sig + 1));
}
diff --git a/arch/um/os-Linux/sys-x86_64/signal.c b/arch/um/os-Linux/sys-x86_64/signal.c
index 3f369e5f976..82a388822cd 100644
--- a/arch/um/os-Linux/sys-x86_64/signal.c
+++ b/arch/um/os-Linux/sys-x86_64/signal.c
@@ -1,16 +1,16 @@
/*
- * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
+ * Copyright (C) 2006 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <signal.h>
-extern void (*handlers[])(int sig, struct sigcontext *sc);
+extern void handle_signal(int sig, struct sigcontext *sc);
void hard_handler(int sig)
{
struct ucontext *uc;
asm("movq %%rdx, %0" : "=r" (uc));
- (*handlers[sig])(sig, (struct sigcontext *) &uc->uc_mcontext);
+ handle_signal(sig, (struct sigcontext *) &uc->uc_mcontext);
}
diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index c307a89ed25..7cbcf484e13 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -33,25 +33,8 @@
void stack_protections(unsigned long address)
{
- int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
-
- if(mprotect((void *) address, UM_KERN_PAGE_SIZE, prot) < 0)
- panic("protecting stack failed, errno = %d", errno);
-}
-
-void task_protections(unsigned long address)
-{
- unsigned long guard = address + UM_KERN_PAGE_SIZE;
- unsigned long stack = guard + UM_KERN_PAGE_SIZE;
- int prot = 0, pages;
-
-#ifdef notdef
- if(mprotect((void *) stack, UM_KERN_PAGE_SIZE, prot) < 0)
- panic("protecting guard page failed, errno = %d", errno);
-#endif
- pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
- prot = PROT_READ | PROT_WRITE | PROT_EXEC;
- if(mprotect((void *) stack, pages * UM_KERN_PAGE_SIZE, prot) < 0)
+ if(mprotect((void *) address, UM_THREAD_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
panic("protecting stack failed, errno = %d", errno);
}
@@ -72,7 +55,7 @@ int raw(int fd)
/* XXX tcsetattr could have applied only some changes
* (and cfmakeraw() is a set of changes) */
- return(0);
+ return 0;
}
void setup_machinename(char *machine_out)
diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index f2106837827..52be79beb30 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -716,4 +716,7 @@ ia32_sys_call_table:
.quad sys_getcpu
.quad sys_epoll_pwait
.quad compat_sys_utimensat /* 320 */
+ .quad sys_signalfd
+ .quad sys_timerfd
+ .quad sys_eventfd
ia32_syscall_end:
diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index 213d90e0475..6c34bdd22e2 100644
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -62,13 +62,6 @@ void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
- /*
- * Make sure kernel is aligned to 2MB address. Catching it at compile
- * time is better. Change your config file and compile the kernel
- * for a 2MB aligned address (CONFIG_PHYSICAL_START)
- */
- BUILD_BUG_ON(CONFIG_PHYSICAL_START & (__KERNEL_ALIGN - 1));
-
/* clear bss before set_intr_gate with early_idt_handler */
clear_bss();