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-rw-r--r--arch/x86/kernel/Makefile1
-rw-r--r--arch/x86/kernel/i387.c80
-rw-r--r--arch/x86/kernel/process.c35
-rw-r--r--arch/x86/kernel/process_32.c2
-rw-r--r--arch/x86/kernel/process_64.c2
-rw-r--r--arch/x86/kernel/traps_32.c6
-rw-r--r--arch/x86/kernel/traps_64.c6
-rw-r--r--arch/x86/math-emu/fpu_entry.c4
-rw-r--r--arch/x86/math-emu/fpu_system.h26
-rw-r--r--arch/x86/math-emu/reg_ld_str.c4
10 files changed, 107 insertions, 59 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index c3920ea8ac5..7a2a2e93e84 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_X86_64) += pci-nommu_64.o bugs_64.o
obj-y += tsc_$(BITS).o io_delay.o rtc.o
obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o
+obj-y += process.o
obj-y += i387.o
obj-y += ptrace.o
obj-y += ds.o
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 8f8102d967b..baf632b221d 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -8,6 +8,7 @@
#include <linux/module.h>
#include <linux/regset.h>
#include <linux/sched.h>
+#include <linux/bootmem.h>
#include <asm/sigcontext.h>
#include <asm/processor.h>
@@ -35,17 +36,18 @@
#endif
static unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
+unsigned int xstate_size;
+static struct i387_fxsave_struct fx_scratch __cpuinitdata;
-void mxcsr_feature_mask_init(void)
+void __cpuinit mxcsr_feature_mask_init(void)
{
unsigned long mask = 0;
clts();
if (cpu_has_fxsr) {
- memset(&current->thread.i387.fxsave, 0,
- sizeof(struct i387_fxsave_struct));
- asm volatile("fxsave %0" : : "m" (current->thread.i387.fxsave));
- mask = current->thread.i387.fxsave.mxcsr_mask;
+ memset(&fx_scratch, 0, sizeof(struct i387_fxsave_struct));
+ asm volatile("fxsave %0" : : "m" (fx_scratch));
+ mask = fx_scratch.mxcsr_mask;
if (mask == 0)
mask = 0x0000ffbf;
}
@@ -53,6 +55,17 @@ void mxcsr_feature_mask_init(void)
stts();
}
+void __init init_thread_xstate(void)
+{
+ if (cpu_has_fxsr)
+ xstate_size = sizeof(struct i387_fxsave_struct);
+#ifdef CONFIG_X86_32
+ else
+ xstate_size = sizeof(struct i387_fsave_struct);
+#endif
+ init_task.thread.xstate = alloc_bootmem(xstate_size);
+}
+
#ifdef CONFIG_X86_64
/*
* Called at bootup to set up the initial FPU state that is later cloned
@@ -61,10 +74,6 @@ void mxcsr_feature_mask_init(void)
void __cpuinit fpu_init(void)
{
unsigned long oldcr0 = read_cr0();
- extern void __bad_fxsave_alignment(void);
-
- if (offsetof(struct task_struct, thread.i387.fxsave) & 15)
- __bad_fxsave_alignment();
set_in_cr4(X86_CR4_OSFXSR);
set_in_cr4(X86_CR4_OSXMMEXCPT);
@@ -93,18 +102,19 @@ void init_fpu(struct task_struct *tsk)
}
if (cpu_has_fxsr) {
- memset(&tsk->thread.i387.fxsave, 0,
- sizeof(struct i387_fxsave_struct));
- tsk->thread.i387.fxsave.cwd = 0x37f;
+ struct i387_fxsave_struct *fx = &tsk->thread.xstate->fxsave;
+
+ memset(fx, 0, xstate_size);
+ fx->cwd = 0x37f;
if (cpu_has_xmm)
- tsk->thread.i387.fxsave.mxcsr = MXCSR_DEFAULT;
+ fx->mxcsr = MXCSR_DEFAULT;
} else {
- memset(&tsk->thread.i387.fsave, 0,
- sizeof(struct i387_fsave_struct));
- tsk->thread.i387.fsave.cwd = 0xffff037fu;
- tsk->thread.i387.fsave.swd = 0xffff0000u;
- tsk->thread.i387.fsave.twd = 0xffffffffu;
- tsk->thread.i387.fsave.fos = 0xffff0000u;
+ struct i387_fsave_struct *fp = &tsk->thread.xstate->fsave;
+ memset(fp, 0, xstate_size);
+ fp->cwd = 0xffff037fu;
+ fp->swd = 0xffff0000u;
+ fp->twd = 0xffffffffu;
+ fp->fos = 0xffff0000u;
}
/*
* Only the device not available exception or ptrace can call init_fpu.
@@ -132,7 +142,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
init_fpu(target);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &target->thread.i387.fxsave, 0, -1);
+ &target->thread.xstate->fxsave, 0, -1);
}
int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
@@ -148,12 +158,12 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
set_stopped_child_used_math(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &target->thread.i387.fxsave, 0, -1);
+ &target->thread.xstate->fxsave, 0, -1);
/*
* mxcsr reserved bits must be masked to zero for security reasons.
*/
- target->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+ target->thread.xstate->fxsave.mxcsr &= mxcsr_feature_mask;
return ret;
}
@@ -233,7 +243,7 @@ static inline u32 twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
static void
convert_from_fxsr(struct user_i387_ia32_struct *env, struct task_struct *tsk)
{
- struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+ struct i387_fxsave_struct *fxsave = &tsk->thread.xstate->fxsave;
struct _fpreg *to = (struct _fpreg *) &env->st_space[0];
struct _fpxreg *from = (struct _fpxreg *) &fxsave->st_space[0];
int i;
@@ -273,7 +283,7 @@ static void convert_to_fxsr(struct task_struct *tsk,
const struct user_i387_ia32_struct *env)
{
- struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+ struct i387_fxsave_struct *fxsave = &tsk->thread.xstate->fxsave;
struct _fpreg *from = (struct _fpreg *) &env->st_space[0];
struct _fpxreg *to = (struct _fpxreg *) &fxsave->st_space[0];
int i;
@@ -310,7 +320,8 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
if (!cpu_has_fxsr) {
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &target->thread.i387.fsave, 0, -1);
+ &target->thread.xstate->fsave, 0,
+ -1);
}
if (kbuf && pos == 0 && count == sizeof(env)) {
@@ -338,7 +349,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
if (!cpu_has_fxsr) {
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &target->thread.i387.fsave, 0, -1);
+ &target->thread.xstate->fsave, 0, -1);
}
if (pos > 0 || count < sizeof(env))
@@ -358,11 +369,11 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
static inline int save_i387_fsave(struct _fpstate_ia32 __user *buf)
{
struct task_struct *tsk = current;
+ struct i387_fsave_struct *fp = &tsk->thread.xstate->fsave;
unlazy_fpu(tsk);
- tsk->thread.i387.fsave.status = tsk->thread.i387.fsave.swd;
- if (__copy_to_user(buf, &tsk->thread.i387.fsave,
- sizeof(struct i387_fsave_struct)))
+ fp->status = fp->swd;
+ if (__copy_to_user(buf, fp, sizeof(struct i387_fsave_struct)))
return -1;
return 1;
}
@@ -370,6 +381,7 @@ static inline int save_i387_fsave(struct _fpstate_ia32 __user *buf)
static int save_i387_fxsave(struct _fpstate_ia32 __user *buf)
{
struct task_struct *tsk = current;
+ struct i387_fxsave_struct *fx = &tsk->thread.xstate->fxsave;
struct user_i387_ia32_struct env;
int err = 0;
@@ -379,12 +391,12 @@ static int save_i387_fxsave(struct _fpstate_ia32 __user *buf)
if (__copy_to_user(buf, &env, sizeof(env)))
return -1;
- err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
+ err |= __put_user(fx->swd, &buf->status);
err |= __put_user(X86_FXSR_MAGIC, &buf->magic);
if (err)
return -1;
- if (__copy_to_user(&buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
+ if (__copy_to_user(&buf->_fxsr_env[0], fx,
sizeof(struct i387_fxsave_struct)))
return -1;
return 1;
@@ -417,7 +429,7 @@ static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
struct task_struct *tsk = current;
clear_fpu(tsk);
- return __copy_from_user(&tsk->thread.i387.fsave, buf,
+ return __copy_from_user(&tsk->thread.xstate->fsave, buf,
sizeof(struct i387_fsave_struct));
}
@@ -428,10 +440,10 @@ static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
int err;
clear_fpu(tsk);
- err = __copy_from_user(&tsk->thread.i387.fxsave, &buf->_fxsr_env[0],
+ err = __copy_from_user(&tsk->thread.xstate->fxsave, &buf->_fxsr_env[0],
sizeof(struct i387_fxsave_struct));
/* mxcsr reserved bits must be masked to zero for security reasons */
- tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+ tsk->thread.xstate->fxsave.mxcsr &= mxcsr_feature_mask;
if (err || __copy_from_user(&env, buf, sizeof(env)))
return 1;
convert_to_fxsr(tsk, &env);
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
new file mode 100644
index 00000000000..ead24efbcba
--- /dev/null
+++ b/arch/x86/kernel/process.c
@@ -0,0 +1,35 @@
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+static struct kmem_cache *task_xstate_cachep;
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ *dst = *src;
+ dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
+ if (!dst->thread.xstate)
+ return -ENOMEM;
+ WARN_ON((unsigned long)dst->thread.xstate & 15);
+ memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
+ return 0;
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+ kmem_cache_free(task_xstate_cachep, ti->task->thread.xstate);
+ ti->task->thread.xstate = NULL;
+
+ free_pages((unsigned long)(ti), get_order(THREAD_SIZE));
+}
+
+void arch_task_cache_init(void)
+{
+ task_xstate_cachep =
+ kmem_cache_create("task_xstate", xstate_size,
+ __alignof__(union thread_xstate),
+ SLAB_PANIC, NULL);
+}
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index a3790a3f8a8..3890a5dd25f 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -703,7 +703,7 @@ struct task_struct * __switch_to(struct task_struct *prev_p, struct task_struct
/* we're going to use this soon, after a few expensive things */
if (next_p->fpu_counter > 5)
- prefetch(&next->i387.fxsave);
+ prefetch(next->xstate);
/*
* Reload esp0.
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 4c13b1406c7..b795e831afd 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -682,7 +682,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/* we're going to use this soon, after a few expensive things */
if (next_p->fpu_counter>5)
- prefetch(&next->i387.fxsave);
+ prefetch(next->xstate);
/*
* Reload esp0, LDT and the page table pointer:
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index dc4273010f2..8d136a73ce8 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -1208,11 +1208,6 @@ void __init trap_init(void)
#endif
set_trap_gate(19, &simd_coprocessor_error);
- /*
- * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
- * Generate a build-time error if the alignment is wrong.
- */
- BUILD_BUG_ON(offsetof(struct task_struct, thread.i387.fxsave) & 15);
if (cpu_has_fxsr) {
printk(KERN_INFO "Enabling fast FPU save and restore... ");
set_in_cr4(X86_CR4_OSFXSR);
@@ -1233,6 +1228,7 @@ void __init trap_init(void)
set_bit(SYSCALL_VECTOR, used_vectors);
+ init_thread_xstate();
/*
* Should be a barrier for any external CPU state:
*/
diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
index 6d883b13ef4..dc0cb497eec 100644
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -1128,7 +1128,7 @@ asmlinkage void math_state_restore(void)
if (!used_math())
init_fpu(me);
- restore_fpu_checking(&me->thread.i387.fxsave);
+ restore_fpu_checking(&me->thread.xstate->fxsave);
task_thread_info(me)->status |= TS_USEDFPU;
me->fpu_counter++;
}
@@ -1164,6 +1164,10 @@ void __init trap_init(void)
#endif
/*
+ * initialize the per thread extended state:
+ */
+ init_thread_xstate();
+ /*
* Should be a barrier for any external CPU state.
*/
cpu_init();
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 4bab3b14539..6e38d877ea7 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -678,7 +678,7 @@ int fpregs_soft_set(struct task_struct *target,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
- struct i387_soft_struct *s387 = &target->thread.i387.soft;
+ struct i387_soft_struct *s387 = &target->thread.xstate->soft;
void *space = s387->st_space;
int ret;
int offset, other, i, tags, regnr, tag, newtop;
@@ -730,7 +730,7 @@ int fpregs_soft_get(struct task_struct *target,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
- struct i387_soft_struct *s387 = &target->thread.i387.soft;
+ struct i387_soft_struct *s387 = &target->thread.xstate->soft;
const void *space = s387->st_space;
int ret;
int offset = (S387->ftop & 7) * 10, other = 80 - offset;
diff --git a/arch/x86/math-emu/fpu_system.h b/arch/x86/math-emu/fpu_system.h
index a3ae28c49dd..13488fa153e 100644
--- a/arch/x86/math-emu/fpu_system.h
+++ b/arch/x86/math-emu/fpu_system.h
@@ -35,8 +35,8 @@
#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
== (1 << 10))
-#define I387 (current->thread.i387)
-#define FPU_info (I387.soft.info)
+#define I387 (current->thread.xstate)
+#define FPU_info (I387->soft.info)
#define FPU_CS (*(unsigned short *) &(FPU_info->___cs))
#define FPU_SS (*(unsigned short *) &(FPU_info->___ss))
@@ -46,25 +46,25 @@
#define FPU_EIP (FPU_info->___eip)
#define FPU_ORIG_EIP (FPU_info->___orig_eip)
-#define FPU_lookahead (I387.soft.lookahead)
+#define FPU_lookahead (I387->soft.lookahead)
/* nz if ip_offset and cs_selector are not to be set for the current
instruction. */
-#define no_ip_update (*(u_char *)&(I387.soft.no_update))
-#define FPU_rm (*(u_char *)&(I387.soft.rm))
+#define no_ip_update (*(u_char *)&(I387->soft.no_update))
+#define FPU_rm (*(u_char *)&(I387->soft.rm))
/* Number of bytes of data which can be legally accessed by the current
instruction. This only needs to hold a number <= 108, so a byte will do. */
-#define access_limit (*(u_char *)&(I387.soft.alimit))
+#define access_limit (*(u_char *)&(I387->soft.alimit))
-#define partial_status (I387.soft.swd)
-#define control_word (I387.soft.cwd)
-#define fpu_tag_word (I387.soft.twd)
-#define registers (I387.soft.st_space)
-#define top (I387.soft.ftop)
+#define partial_status (I387->soft.swd)
+#define control_word (I387->soft.cwd)
+#define fpu_tag_word (I387->soft.twd)
+#define registers (I387->soft.st_space)
+#define top (I387->soft.ftop)
-#define instruction_address (*(struct address *)&I387.soft.fip)
-#define operand_address (*(struct address *)&I387.soft.foo)
+#define instruction_address (*(struct address *)&I387->soft.fip)
+#define operand_address (*(struct address *)&I387->soft.foo)
#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
math_abort(FPU_info,SIGSEGV)
diff --git a/arch/x86/math-emu/reg_ld_str.c b/arch/x86/math-emu/reg_ld_str.c
index 02af772a24d..d597fe7423c 100644
--- a/arch/x86/math-emu/reg_ld_str.c
+++ b/arch/x86/math-emu/reg_ld_str.c
@@ -1180,8 +1180,8 @@ u_char __user *fstenv(fpu_addr_modes addr_modes, u_char __user *d)
control_word |= 0xffff0040;
partial_status = status_word() | 0xffff0000;
fpu_tag_word |= 0xffff0000;
- I387.soft.fcs &= ~0xf8000000;
- I387.soft.fos |= 0xffff0000;
+ I387->soft.fcs &= ~0xf8000000;
+ I387->soft.fos |= 0xffff0000;
#endif /* PECULIAR_486 */
if (__copy_to_user(d, &control_word, 7 * 4))
FPU_abort;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-16 07:55:05 +0000