#include <linux/sched.h>
#include <linux/module.h>
+#include <linux/regset.h>
#include <asm/processor.h>
#include <asm/i387.h>
#include <asm/math_emu.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>
+#ifdef CONFIG_X86_64
+
+#include <asm/sigcontext32.h>
+#include <asm/user32.h>
+
+#else
+
+#define save_i387_ia32 save_i387
+#define restore_i387_ia32 restore_i387
+
+#define _fpstate_ia32 _fpstate
+#define user_i387_ia32_struct user_i387_struct
+#define user32_fxsr_struct user_fxsr_struct
+
+#endif
+
#ifdef CONFIG_MATH_EMULATION
#define HAVE_HWFP (boot_cpu_data.hard_math)
#else
#define HAVE_HWFP 1
#endif
-static unsigned long mxcsr_feature_mask __read_mostly = 0xffffffff;
+unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
void mxcsr_feature_mask_init(void)
{
stts();
}
+#ifdef CONFIG_X86_64
+/*
+ * Called at bootup to set up the initial FPU state that is later cloned
+ * into all processes.
+ */
+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);
+
+ write_cr0(oldcr0 & ~((1UL<<3)|(1UL<<2))); /* clear TS and EM */
+
+ mxcsr_feature_mask_init();
+ /* clean state in init */
+ current_thread_info()->status = 0;
+ clear_used_math();
+}
+#endif /* CONFIG_X86_64 */
+
/*
* The _current_ task is using the FPU for the first time
* so initialize it and set the mxcsr to its default
*/
void init_fpu(struct task_struct *tsk)
{
+ if (tsk_used_math(tsk)) {
+ if (tsk == current)
+ unlazy_fpu(tsk);
+ return;
+ }
+
if (cpu_has_fxsr) {
memset(&tsk->thread.i387.fxsave, 0,
sizeof(struct i387_fxsave_struct));
tsk->thread.i387.fxsave.cwd = 0x37f;
if (cpu_has_xmm)
- tsk->thread.i387.fxsave.mxcsr = 0x1f80;
+ tsk->thread.i387.fxsave.mxcsr = MXCSR_DEFAULT;
} else {
memset(&tsk->thread.i387.fsave, 0,
sizeof(struct i387_fsave_struct));
tsk->thread.i387.fsave.twd = 0xffffffffu;
tsk->thread.i387.fsave.fos = 0xffff0000u;
}
- /* only the device not available exception
- * or ptrace can call init_fpu */
+ /*
+ * Only the device not available exception or ptrace can call init_fpu.
+ */
set_stopped_child_used_math(tsk);
}
-/*
- * FPU lazy state save handling.
- */
+int fpregs_active(struct task_struct *target, const struct user_regset *regset)
+{
+ return tsk_used_math(target) ? regset->n : 0;
+}
-void kernel_fpu_begin(void)
+int xfpregs_active(struct task_struct *target, const struct user_regset *regset)
{
- struct thread_info *thread = current_thread_info();
+ return (cpu_has_fxsr && tsk_used_math(target)) ? regset->n : 0;
+}
- preempt_disable();
- if (thread->status & TS_USEDFPU) {
- __save_init_fpu(thread->task);
- return;
- }
- clts();
+int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ if (!cpu_has_fxsr)
+ return -ENODEV;
+
+ unlazy_fpu(target);
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.i387.fxsave, 0, -1);
}
-EXPORT_SYMBOL_GPL(kernel_fpu_begin);
+
+int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+
+ if (!cpu_has_fxsr)
+ return -ENODEV;
+
+ unlazy_fpu(target);
+ set_stopped_child_used_math(target);
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.i387.fxsave, 0, -1);
+
+ /*
+ * mxcsr reserved bits must be masked to zero for security reasons.
+ */
+ target->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+
+ return ret;
+}
+
+#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
/*
* FPU tag word conversions.
/* Transform each pair of bits into 01 (valid) or 00 (empty) */
tmp = ~twd;
- tmp = (tmp | (tmp >> 1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
+ tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
/* and move the valid bits to the lower byte. */
tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
-
return tmp;
}
-static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
-{
- struct _fpxreg *st = NULL;
- unsigned long tos = (fxsave->swd >> 11) & 7;
- unsigned long twd = (unsigned long) fxsave->twd;
- unsigned long tag;
- unsigned long ret = 0xffff0000u;
- int i;
-
#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
+#define FP_EXP_TAG_VALID 0
+#define FP_EXP_TAG_ZERO 1
+#define FP_EXP_TAG_SPECIAL 2
+#define FP_EXP_TAG_EMPTY 3
+
+static inline u32 twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
+{
+ struct _fpxreg *st;
+ u32 tos = (fxsave->swd >> 11) & 7;
+ u32 twd = (unsigned long) fxsave->twd;
+ u32 tag;
+ u32 ret = 0xffff0000u;
+ int i;
- for (i = 0; i < 8; i++) {
+ for (i = 0; i < 8; i++, twd >>= 1) {
if (twd & 0x1) {
st = FPREG_ADDR(fxsave, (i - tos) & 7);
switch (st->exponent & 0x7fff) {
case 0x7fff:
- tag = 2; /* Special */
+ tag = FP_EXP_TAG_SPECIAL;
break;
case 0x0000:
if (!st->significand[0] &&
!st->significand[1] &&
!st->significand[2] &&
- !st->significand[3]) {
- tag = 1; /* Zero */
- } else {
- tag = 2; /* Special */
- }
+ !st->significand[3])
+ tag = FP_EXP_TAG_ZERO;
+ else
+ tag = FP_EXP_TAG_SPECIAL;
break;
default:
- if (st->significand[3] & 0x8000) {
- tag = 0; /* Valid */
- } else {
- tag = 2; /* Special */
- }
+ if (st->significand[3] & 0x8000)
+ tag = FP_EXP_TAG_VALID;
+ else
+ tag = FP_EXP_TAG_SPECIAL;
break;
}
} else {
- tag = 3; /* Empty */
+ tag = FP_EXP_TAG_EMPTY;
}
- ret |= (tag << (2 * i));
- twd = twd >> 1;
+ ret |= tag << (2 * i);
}
return ret;
}
/*
- * FPU state interaction.
+ * FXSR floating point environment conversions.
*/
-unsigned short get_fpu_cwd(struct task_struct *tsk)
+static void convert_from_fxsr(struct user_i387_ia32_struct *env,
+ struct task_struct *tsk)
{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.cwd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.cwd;
- }
-}
+ struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+ struct _fpreg *to = (struct _fpreg *) &env->st_space[0];
+ struct _fpxreg *from = (struct _fpxreg *) &fxsave->st_space[0];
+ int i;
-unsigned short get_fpu_swd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.swd;
+ env->cwd = fxsave->cwd | 0xffff0000u;
+ env->swd = fxsave->swd | 0xffff0000u;
+ env->twd = twd_fxsr_to_i387(fxsave);
+
+#ifdef CONFIG_X86_64
+ env->fip = fxsave->rip;
+ env->foo = fxsave->rdp;
+ if (tsk == current) {
+ /*
+ * should be actually ds/cs at fpu exception time, but
+ * that information is not available in 64bit mode.
+ */
+ asm("mov %%ds,%0" : "=r" (env->fos));
+ asm("mov %%cs,%0" : "=r" (env->fcs));
} else {
- return (unsigned short)tsk->thread.i387.fsave.swd;
+ struct pt_regs *regs = task_pt_regs(tsk);
+ env->fos = 0xffff0000 | tsk->thread.ds;
+ env->fcs = regs->cs;
}
-}
-
-#if 0
-unsigned short get_fpu_twd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.twd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.twd;
- }
-}
-#endif /* 0 */
+#else
+ env->fip = fxsave->fip;
+ env->fcs = fxsave->fcs;
+ env->foo = fxsave->foo;
+ env->fos = fxsave->fos;
+#endif
-unsigned short get_fpu_mxcsr(struct task_struct *tsk)
-{
- if (cpu_has_xmm) {
- return tsk->thread.i387.fxsave.mxcsr;
- } else {
- return 0x1f80;
- }
+ for (i = 0; i < 8; ++i)
+ memcpy(&to[i], &from[i], sizeof(to[0]));
}
-#if 0
+static void convert_to_fxsr(struct task_struct *tsk,
+ const struct user_i387_ia32_struct *env)
-void set_fpu_cwd(struct task_struct *tsk, unsigned short cwd)
{
- if (cpu_has_fxsr) {
- tsk->thread.i387.fxsave.cwd = cwd;
- } else {
- tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000u);
- }
-}
+ struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+ struct _fpreg *from = (struct _fpreg *) &env->st_space[0];
+ struct _fpxreg *to = (struct _fpxreg *) &fxsave->st_space[0];
+ int i;
-void set_fpu_swd(struct task_struct *tsk, unsigned short swd)
-{
- if (cpu_has_fxsr) {
- tsk->thread.i387.fxsave.swd = swd;
- } else {
- tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000u);
- }
-}
+ fxsave->cwd = env->cwd;
+ fxsave->swd = env->swd;
+ fxsave->twd = twd_i387_to_fxsr(env->twd);
+ fxsave->fop = (u16) ((u32) env->fcs >> 16);
+#ifdef CONFIG_X86_64
+ fxsave->rip = env->fip;
+ fxsave->rdp = env->foo;
+ /* cs and ds ignored */
+#else
+ fxsave->fip = env->fip;
+ fxsave->fcs = (env->fcs & 0xffff);
+ fxsave->foo = env->foo;
+ fxsave->fos = env->fos;
+#endif
-void set_fpu_twd(struct task_struct *tsk, unsigned short twd)
-{
- if (cpu_has_fxsr) {
- tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd);
- } else {
- tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000u);
- }
+ for (i = 0; i < 8; ++i)
+ memcpy(&to[i], &from[i], sizeof(from[0]));
}
-#endif /* 0 */
-
-/*
- * FXSR floating point environment conversions.
- */
-
-static int convert_fxsr_to_user(struct _fpstate __user *buf,
- struct i387_fxsave_struct *fxsave)
+int fpregs_get(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- unsigned long env[7];
- struct _fpreg __user *to;
- struct _fpxreg *from;
- int i;
+ struct user_i387_ia32_struct env;
- env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
- env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
- env[2] = twd_fxsr_to_i387(fxsave);
- env[3] = fxsave->fip;
- env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
- env[5] = fxsave->foo;
- env[6] = fxsave->fos;
+ if (!HAVE_HWFP)
+ return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
- if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
- return 1;
+ unlazy_fpu(target);
- to = &buf->_st[0];
- from = (struct _fpxreg *) &fxsave->st_space[0];
- for (i = 0; i < 8; i++, to++, from++) {
- unsigned long __user *t = (unsigned long __user *)to;
- unsigned long *f = (unsigned long *)from;
+ if (!cpu_has_fxsr)
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.i387.fsave, 0, -1);
- if (__put_user(*f, t) ||
- __put_user(*(f + 1), t + 1) ||
- __put_user(from->exponent, &to->exponent))
- return 1;
+ if (kbuf && pos == 0 && count == sizeof(env)) {
+ convert_from_fxsr(kbuf, target);
+ return 0;
}
- return 0;
+
+ convert_from_fxsr(&env, target);
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &env, 0, -1);
}
-static int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
- struct _fpstate __user *buf)
+int fpregs_set(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
{
- unsigned long env[7];
- struct _fpxreg *to;
- struct _fpreg __user *from;
- int i;
+ struct user_i387_ia32_struct env;
+ int ret;
- if (__copy_from_user(env, buf, 7 * sizeof(long)))
- return 1;
+ if (!HAVE_HWFP)
+ return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
- fxsave->cwd = (unsigned short)(env[0] & 0xffff);
- fxsave->swd = (unsigned short)(env[1] & 0xffff);
- fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
- fxsave->fip = env[3];
- fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
- fxsave->fcs = (env[4] & 0xffff);
- fxsave->foo = env[5];
- fxsave->fos = env[6];
-
- to = (struct _fpxreg *) &fxsave->st_space[0];
- from = &buf->_st[0];
- for (i = 0; i < 8; i++, to++, from++) {
- unsigned long *t = (unsigned long *)to;
- unsigned long __user *f = (unsigned long __user *)from;
-
- if (__get_user(*t, f) ||
- __get_user(*(t + 1), f + 1) ||
- __get_user(to->exponent, &from->exponent))
- return 1;
- }
- return 0;
+ unlazy_fpu(target);
+ set_stopped_child_used_math(target);
+
+ if (!cpu_has_fxsr)
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.i387.fsave, 0, -1);
+
+ if (pos > 0 || count < sizeof(env))
+ convert_from_fxsr(&env, target);
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &env, 0, -1);
+ if (!ret)
+ convert_to_fxsr(target, &env);
+
+ return ret;
}
/*
* Signal frame handlers.
*/
-static inline int save_i387_fsave(struct _fpstate __user *buf)
+static inline int save_i387_fsave(struct _fpstate_ia32 __user *buf)
{
struct task_struct *tsk = current;
return 1;
}
-static int save_i387_fxsave(struct _fpstate __user *buf)
+static int save_i387_fxsave(struct _fpstate_ia32 __user *buf)
{
struct task_struct *tsk = current;
+ struct user_i387_ia32_struct env;
int err = 0;
unlazy_fpu(tsk);
- if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave))
+ convert_from_fxsr(&env, tsk);
+ if (__copy_to_user(buf, &env, sizeof(env)))
return -1;
err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
return 1;
}
-int save_i387(struct _fpstate __user *buf)
+int save_i387_ia32(struct _fpstate_ia32 __user *buf)
{
if (!used_math())
return 0;
return save_i387_fsave(buf);
}
} else {
- return save_i387_soft(¤t->thread.i387.soft, buf);
+ return fpregs_soft_get(current, NULL,
+ 0, sizeof(struct user_i387_ia32_struct),
+ NULL, buf) ? -1 : 1;
}
}
-static inline int restore_i387_fsave(struct _fpstate __user *buf)
+static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
{
struct task_struct *tsk = current;
clear_fpu(tsk);
sizeof(struct i387_fsave_struct));
}
-static int restore_i387_fxsave(struct _fpstate __user *buf)
+static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
{
int err;
struct task_struct *tsk = current;
+ struct user_i387_ia32_struct env;
clear_fpu(tsk);
err = __copy_from_user(&tsk->thread.i387.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;
- return err ? 1 : convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf);
+ if (err || __copy_from_user(&env, buf, sizeof(env)))
+ return 1;
+ convert_to_fxsr(tsk, &env);
+ return 0;
}
-int restore_i387(struct _fpstate __user *buf)
+int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
{
int err;
err = restore_i387_fsave(buf);
}
} else {
- err = restore_i387_soft(¤t->thread.i387.soft, buf);
+ err = fpregs_soft_set(current, NULL,
+ 0, sizeof(struct user_i387_ia32_struct),
+ NULL, buf) != 0;
}
set_used_math();
return err;
}
-/*
- * ptrace request handlers.
- */
+#endif /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
-static inline int get_fpregs_fsave(struct user_i387_struct __user *buf,
- struct task_struct *tsk)
-{
- return __copy_to_user(buf, &tsk->thread.i387.fsave,
- sizeof(struct user_i387_struct));
-}
-
-static inline int get_fpregs_fxsave(struct user_i387_struct __user *buf,
- struct task_struct *tsk)
-{
- return convert_fxsr_to_user((struct _fpstate __user *)buf,
- &tsk->thread.i387.fxsave);
-}
+#ifdef CONFIG_X86_64
int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk)
{
- if (HAVE_HWFP) {
- if (cpu_has_fxsr) {
- return get_fpregs_fxsave(buf, tsk);
- } else {
- return get_fpregs_fsave(buf, tsk);
- }
- } else {
- return save_i387_soft(&tsk->thread.i387.soft,
- (struct _fpstate __user *)buf);
- }
+ return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
-static inline int set_fpregs_fsave(struct task_struct *tsk,
- struct user_i387_struct __user *buf)
+int set_fpregs(struct task_struct *tsk, struct user_i387_struct __user *buf)
{
- return __copy_from_user(&tsk->thread.i387.fsave, buf,
- sizeof(struct user_i387_struct));
+ return xfpregs_set(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
-static inline int set_fpregs_fxsave(struct task_struct *tsk,
- struct user_i387_struct __user *buf)
+#else
+
+int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk)
{
- return convert_fxsr_from_user(&tsk->thread.i387.fxsave,
- (struct _fpstate __user *)buf);
+ return fpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
int set_fpregs(struct task_struct *tsk, struct user_i387_struct __user *buf)
{
- if (HAVE_HWFP) {
- if (cpu_has_fxsr) {
- return set_fpregs_fxsave(tsk, buf);
- } else {
- return set_fpregs_fsave(tsk, buf);
- }
- } else {
- return restore_i387_soft(&tsk->thread.i387.soft,
- (struct _fpstate __user *)buf);
- }
+ return fpregs_set(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *tsk)
{
- if (cpu_has_fxsr) {
- if (__copy_to_user(buf, &tsk->thread.i387.fxsave,
- sizeof(struct user_fxsr_struct)))
- return -EFAULT;
- return 0;
- } else {
- return -EIO;
- }
+ return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
int set_fpxregs(struct task_struct *tsk, struct user_fxsr_struct __user *buf)
{
- int ret = 0;
-
- if (cpu_has_fxsr) {
- if (__copy_from_user(&tsk->thread.i387.fxsave, buf,
- sizeof(struct user_fxsr_struct)))
- ret = -EFAULT;
- /* mxcsr reserved bits must be masked to zero
- * for security reasons */
- tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
- } else {
- ret = -EIO;
- }
- return ret;
+ return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
}
+#endif
+
/*
* FPU state for core dumps.
*/
}
int dump_task_extended_fpu(struct task_struct *tsk,
- struct user_fxsr_struct *fpu)
+ struct user32_fxsr_struct *fpu)
{
int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;
projects / linux-2.6 / commitdiff