2006-12-25 01:51:47 +01:00
|
|
|
/*
|
|
|
|
* arch/sh/kernel/process.c
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
2006-12-25 01:51:47 +01:00
|
|
|
* This file handles the architecture-dependent parts of process handling..
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
|
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
|
|
*
|
|
|
|
* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
|
2006-10-12 05:16:13 +02:00
|
|
|
* Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
|
2008-09-21 12:04:55 +02:00
|
|
|
* Copyright (C) 2002 - 2008 Paul Mundt
|
|
|
|
*
|
|
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
|
|
* for more details.
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/mm.h>
|
2017-02-08 18:51:35 +01:00
|
|
|
#include <linux/sched/debug.h>
|
2017-02-08 18:51:36 +01:00
|
|
|
#include <linux/sched/task.h>
|
2017-02-08 18:51:37 +01:00
|
|
|
#include <linux/sched/task_stack.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
|
|
|
#include <linux/slab.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#include <linux/elfcore.h>
|
2007-07-31 06:01:43 +02:00
|
|
|
#include <linux/fs.h>
|
2009-07-11 02:29:04 +02:00
|
|
|
#include <linux/ftrace.h>
|
2009-11-09 08:27:40 +01:00
|
|
|
#include <linux/hw_breakpoint.h>
|
2011-05-24 10:25:23 +02:00
|
|
|
#include <linux/prefetch.h>
|
2012-04-19 08:45:57 +02:00
|
|
|
#include <linux/stackprotector.h>
|
2016-12-24 20:46:01 +01:00
|
|
|
#include <linux/uaccess.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#include <asm/mmu_context.h>
|
2008-03-26 11:02:47 +01:00
|
|
|
#include <asm/fpu.h>
|
2008-09-04 11:53:58 +02:00
|
|
|
#include <asm/syscalls.h>
|
2012-03-30 12:29:57 +02:00
|
|
|
#include <asm/switch_to.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
|
|
{
|
|
|
|
printk("\n");
|
dump_stack: unify debug information printed by show_regs()
show_regs() is inherently arch-dependent but it does make sense to print
generic debug information and some archs already do albeit in slightly
different forms. This patch introduces a generic function to print debug
information from show_regs() so that different archs print out the same
information and it's much easier to modify what's printed.
show_regs_print_info() prints out the same debug info as dump_stack()
does plus task and thread_info pointers.
* Archs which didn't print debug info now do.
alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r,
metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc,
um, xtensa
* Already prints debug info. Replaced with show_regs_print_info().
The printed information is superset of what used to be there.
arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86
* s390 is special in that it used to print arch-specific information
along with generic debug info. Heiko and Martin think that the
arch-specific extra isn't worth keeping s390 specfic implementation.
Converted to use the generic version.
Note that now all archs print the debug info before actual register
dumps.
An example BUG() dump follows.
kernel BUG at /work/os/work/kernel/workqueue.c:4841!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7
Hardware name: empty empty/S3992, BIOS 080011 10/26/2007
task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000
RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6
RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246
RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001
RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a
RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650
0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d
ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760
Call Trace:
[<ffffffff81000312>] do_one_initcall+0x122/0x170
[<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8
[<ffffffff81c47760>] ? rest_init+0x140/0x140
[<ffffffff81c4776e>] kernel_init+0xe/0xf0
[<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0
[<ffffffff81c47760>] ? rest_init+0x140/0x140
...
v2: Typo fix in x86-32.
v3: CPU number dropped from show_regs_print_info() as
dump_stack_print_info() has been updated to print it. s390
specific implementation dropped as requested by s390 maintainers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-01 00:27:17 +02:00
|
|
|
show_regs_print_info(KERN_DEFAULT);
|
2008-08-07 18:23:34 +02:00
|
|
|
|
2017-12-11 13:50:18 +01:00
|
|
|
printk("PC is at %pS\n", (void *)instruction_pointer(regs));
|
|
|
|
printk("PR is at %pS\n", (void *)regs->pr);
|
2008-08-07 18:23:34 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
printk("PC : %08lx SP : %08lx SR : %08lx ",
|
|
|
|
regs->pc, regs->regs[15], regs->sr);
|
|
|
|
#ifdef CONFIG_MMU
|
2010-01-26 04:58:40 +01:00
|
|
|
printk("TEA : %08x\n", __raw_readl(MMU_TEA));
|
2005-04-17 00:20:36 +02:00
|
|
|
#else
|
2008-08-07 18:23:34 +02:00
|
|
|
printk("\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
|
|
|
|
regs->regs[0],regs->regs[1],
|
|
|
|
regs->regs[2],regs->regs[3]);
|
|
|
|
printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
|
|
|
|
regs->regs[4],regs->regs[5],
|
|
|
|
regs->regs[6],regs->regs[7]);
|
|
|
|
printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n",
|
|
|
|
regs->regs[8],regs->regs[9],
|
|
|
|
regs->regs[10],regs->regs[11]);
|
|
|
|
printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
|
|
|
|
regs->regs[12],regs->regs[13],
|
|
|
|
regs->regs[14]);
|
|
|
|
printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n",
|
|
|
|
regs->mach, regs->macl, regs->gbr, regs->pr);
|
|
|
|
|
2006-10-12 10:07:45 +02:00
|
|
|
show_trace(NULL, (unsigned long *)regs->regs[15], regs);
|
2008-11-26 06:31:03 +01:00
|
|
|
show_code(regs);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2010-01-12 10:52:00 +01:00
|
|
|
void start_thread(struct pt_regs *regs, unsigned long new_pc,
|
|
|
|
unsigned long new_sp)
|
|
|
|
{
|
|
|
|
regs->pr = 0;
|
|
|
|
regs->sr = SR_FD;
|
|
|
|
regs->pc = new_pc;
|
|
|
|
regs->regs[15] = new_sp;
|
2010-01-13 04:51:40 +01:00
|
|
|
|
|
|
|
free_thread_xstate(current);
|
2010-01-12 10:52:00 +01:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(start_thread);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
void flush_thread(void)
|
|
|
|
{
|
|
|
|
struct task_struct *tsk = current;
|
2009-11-09 08:27:40 +01:00
|
|
|
|
|
|
|
flush_ptrace_hw_breakpoint(tsk);
|
|
|
|
|
|
|
|
#if defined(CONFIG_SH_FPU)
|
2005-04-17 00:20:36 +02:00
|
|
|
/* Forget lazy FPU state */
|
2006-01-12 10:05:44 +01:00
|
|
|
clear_fpu(tsk, task_pt_regs(tsk));
|
2005-04-17 00:20:36 +02:00
|
|
|
clear_used_math();
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
|
|
{
|
|
|
|
/* do nothing */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Fill in the fpu structure for a core dump.. */
|
|
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
|
|
|
|
{
|
|
|
|
int fpvalid = 0;
|
|
|
|
|
|
|
|
#if defined(CONFIG_SH_FPU)
|
|
|
|
struct task_struct *tsk = current;
|
|
|
|
|
|
|
|
fpvalid = !!tsk_used_math(tsk);
|
2008-09-21 12:04:55 +02:00
|
|
|
if (fpvalid)
|
|
|
|
fpvalid = !fpregs_get(tsk, NULL, 0,
|
|
|
|
sizeof(struct user_fpu_struct),
|
|
|
|
fpu, NULL);
|
2005-04-17 00:20:36 +02:00
|
|
|
#endif
|
|
|
|
|
|
|
|
return fpvalid;
|
|
|
|
}
|
2009-10-27 03:51:19 +01:00
|
|
|
EXPORT_SYMBOL(dump_fpu);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
asmlinkage void ret_from_fork(void);
|
2012-10-14 07:41:42 +02:00
|
|
|
asmlinkage void ret_from_kernel_thread(void);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-04-03 01:56:59 +02:00
|
|
|
int copy_thread(unsigned long clone_flags, unsigned long usp,
|
2012-10-23 04:51:14 +02:00
|
|
|
unsigned long arg, struct task_struct *p)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-09-27 10:07:07 +02:00
|
|
|
struct thread_info *ti = task_thread_info(p);
|
2005-04-17 00:20:36 +02:00
|
|
|
struct pt_regs *childregs;
|
|
|
|
|
sh: Minor optimisations to FPU handling
A number of small optimisations to FPU handling, in particular:
- move the task USEDFPU flag from the thread_info flags field (which
is accessed asynchronously to the thread) to a new status field,
which is only accessed by the thread itself. This allows locking to
be removed in most cases, or can be reduced to a preempt_lock().
This mimics the i386 behaviour.
- move the modification of regs->sr and thread_info->status flags out
of save_fpu() to __unlazy_fpu(). This gives the compiler a better
chance to optimise things, as well as making save_fpu() symmetrical
with restore_fpu() and init_fpu().
- implement prepare_to_copy(), so that when creating a thread, we can
unlazy the FPU prior to copying the thread data structures.
Also make sure that the FPU is disabled while in the kernel, in
particular while booting, and for newly created kernel threads,
In a very artificial benchmark, the execution time for 2500000
context switches was reduced from 50 to 45 seconds.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-09-25 19:25:10 +02:00
|
|
|
#if defined(CONFIG_SH_DSP)
|
2005-04-17 00:20:36 +02:00
|
|
|
struct task_struct *tsk = current;
|
|
|
|
|
2009-04-03 19:32:33 +02:00
|
|
|
if (is_dsp_enabled(tsk)) {
|
|
|
|
/* We can use the __save_dsp or just copy the struct:
|
|
|
|
* __save_dsp(p);
|
|
|
|
* p->thread.dsp_status.status |= SR_DSP
|
|
|
|
*/
|
|
|
|
p->thread.dsp_status = tsk->thread.dsp_status;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2012-10-14 07:41:42 +02:00
|
|
|
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2012-10-14 07:41:42 +02:00
|
|
|
childregs = task_pt_regs(p);
|
|
|
|
p->thread.sp = (unsigned long) childregs;
|
|
|
|
if (unlikely(p->flags & PF_KTHREAD)) {
|
|
|
|
memset(childregs, 0, sizeof(struct pt_regs));
|
|
|
|
p->thread.pc = (unsigned long) ret_from_kernel_thread;
|
|
|
|
childregs->regs[4] = arg;
|
|
|
|
childregs->regs[5] = usp;
|
|
|
|
childregs->sr = SR_MD;
|
|
|
|
#if defined(CONFIG_SH_FPU)
|
|
|
|
childregs->sr |= SR_FD;
|
|
|
|
#endif
|
2006-09-27 10:07:07 +02:00
|
|
|
ti->addr_limit = KERNEL_DS;
|
sh: Minor optimisations to FPU handling
A number of small optimisations to FPU handling, in particular:
- move the task USEDFPU flag from the thread_info flags field (which
is accessed asynchronously to the thread) to a new status field,
which is only accessed by the thread itself. This allows locking to
be removed in most cases, or can be reduced to a preempt_lock().
This mimics the i386 behaviour.
- move the modification of regs->sr and thread_info->status flags out
of save_fpu() to __unlazy_fpu(). This gives the compiler a better
chance to optimise things, as well as making save_fpu() symmetrical
with restore_fpu() and init_fpu().
- implement prepare_to_copy(), so that when creating a thread, we can
unlazy the FPU prior to copying the thread data structures.
Also make sure that the FPU is disabled while in the kernel, in
particular while booting, and for newly created kernel threads,
In a very artificial benchmark, the execution time for 2500000
context switches was reduced from 50 to 45 seconds.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-09-25 19:25:10 +02:00
|
|
|
ti->status &= ~TS_USEDFPU;
|
2013-11-13 00:08:45 +01:00
|
|
|
p->thread.fpu_counter = 0;
|
2012-10-14 07:41:42 +02:00
|
|
|
return 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2012-10-27 06:13:51 +02:00
|
|
|
*childregs = *current_pt_regs();
|
2012-10-14 07:41:42 +02:00
|
|
|
|
2012-10-27 06:13:51 +02:00
|
|
|
if (usp)
|
|
|
|
childregs->regs[15] = usp;
|
2012-10-14 07:41:42 +02:00
|
|
|
ti->addr_limit = USER_DS;
|
2006-12-25 01:51:47 +01:00
|
|
|
|
2007-02-28 10:35:42 +01:00
|
|
|
if (clone_flags & CLONE_SETTLS)
|
2005-04-17 00:20:36 +02:00
|
|
|
childregs->gbr = childregs->regs[0];
|
2006-12-25 01:51:47 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
childregs->regs[0] = 0; /* Set return value for child */
|
|
|
|
p->thread.pc = (unsigned long) ret_from_fork;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* switch_to(x,y) should switch tasks from x to y.
|
|
|
|
*
|
|
|
|
*/
|
2009-07-11 02:29:04 +02:00
|
|
|
__notrace_funcgraph struct task_struct *
|
|
|
|
__switch_to(struct task_struct *prev, struct task_struct *next)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-07-07 16:25:10 +02:00
|
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|
struct thread_struct *next_t = &next->thread;
|
|
|
|
|
Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables
The changes to automatically test for working stack protector compiler
support in the Kconfig files removed the special STACKPROTECTOR_AUTO
option that picked the strongest stack protector that the compiler
supported.
That was all a nice cleanup - it makes no sense to have the AUTO case
now that the Kconfig phase can just determine the compiler support
directly.
HOWEVER.
It also meant that doing "make oldconfig" would now _disable_ the strong
stackprotector if you had AUTO enabled, because in a legacy config file,
the sane stack protector configuration would look like
CONFIG_HAVE_CC_STACKPROTECTOR=y
# CONFIG_CC_STACKPROTECTOR_NONE is not set
# CONFIG_CC_STACKPROTECTOR_REGULAR is not set
# CONFIG_CC_STACKPROTECTOR_STRONG is not set
CONFIG_CC_STACKPROTECTOR_AUTO=y
and when you ran this through "make oldconfig" with the Kbuild changes,
it would ask you about the regular CONFIG_CC_STACKPROTECTOR (that had
been renamed from CONFIG_CC_STACKPROTECTOR_REGULAR to just
CONFIG_CC_STACKPROTECTOR), but it would think that the STRONG version
used to be disabled (because it was really enabled by AUTO), and would
disable it in the new config, resulting in:
CONFIG_HAVE_CC_STACKPROTECTOR=y
CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
CONFIG_CC_STACKPROTECTOR=y
# CONFIG_CC_STACKPROTECTOR_STRONG is not set
CONFIG_CC_HAS_SANE_STACKPROTECTOR=y
That's dangerously subtle - people could suddenly find themselves with
the weaker stack protector setup without even realizing.
The solution here is to just rename not just the old RECULAR stack
protector option, but also the strong one. This does that by just
removing the CC_ prefix entirely for the user choices, because it really
is not about the compiler support (the compiler support now instead
automatially impacts _visibility_ of the options to users).
This results in "make oldconfig" actually asking the user for their
choice, so that we don't have any silent subtle security model changes.
The end result would generally look like this:
CONFIG_HAVE_CC_STACKPROTECTOR=y
CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
CONFIG_STACKPROTECTOR=y
CONFIG_STACKPROTECTOR_STRONG=y
CONFIG_CC_HAS_SANE_STACKPROTECTOR=y
where the "CC_" versions really are about internal compiler
infrastructure, not the user selections.
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-06-14 05:21:18 +02:00
|
|
|
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
|
2012-04-19 08:45:57 +02:00
|
|
|
__stack_chk_guard = next->stack_canary;
|
|
|
|
#endif
|
|
|
|
|
2006-01-12 10:05:44 +01:00
|
|
|
unlazy_fpu(prev, task_pt_regs(prev));
|
2009-07-07 16:25:10 +02:00
|
|
|
|
|
|
|
/* we're going to use this soon, after a few expensive things */
|
2013-11-13 00:08:45 +01:00
|
|
|
if (next->thread.fpu_counter > 5)
|
2010-01-13 04:51:40 +01:00
|
|
|
prefetch(next_t->xstate);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-09-27 10:25:07 +02:00
|
|
|
#ifdef CONFIG_MMU
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* Restore the kernel mode register
|
2006-12-25 01:51:47 +01:00
|
|
|
* k7 (r7_bank1)
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
|
|
|
asm volatile("ldc %0, r7_bank"
|
|
|
|
: /* no output */
|
2006-01-12 10:05:45 +01:00
|
|
|
: "r" (task_thread_info(next)));
|
2006-09-27 10:25:07 +02:00
|
|
|
#endif
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-11-25 04:07:31 +01:00
|
|
|
/*
|
|
|
|
* If the task has used fpu the last 5 timeslices, just do a full
|
2009-07-07 16:25:10 +02:00
|
|
|
* restore of the math state immediately to avoid the trap; the
|
|
|
|
* chances of needing FPU soon are obviously high now
|
|
|
|
*/
|
2013-11-13 00:08:45 +01:00
|
|
|
if (next->thread.fpu_counter > 5)
|
2010-01-13 04:51:40 +01:00
|
|
|
__fpu_state_restore();
|
2009-07-07 16:25:10 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return prev;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
|
|
|
unsigned long pc;
|
|
|
|
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The same comment as on the Alpha applies here, too ...
|
|
|
|
*/
|
|
|
|
pc = thread_saved_pc(p);
|
2007-07-26 10:46:07 +02:00
|
|
|
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
2005-04-17 00:20:36 +02:00
|
|
|
if (in_sched_functions(pc)) {
|
2007-07-26 10:46:07 +02:00
|
|
|
unsigned long schedule_frame = (unsigned long)p->thread.sp;
|
2006-12-08 09:46:29 +01:00
|
|
|
return ((unsigned long *)schedule_frame)[21];
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2007-07-26 10:46:07 +02:00
|
|
|
#endif
|
2006-12-08 09:46:29 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return pc;
|
|
|
|
}
|