[PATCH -mm 30/43] x86: i387 renaming

From: Roland McGrath
Date: Thu Dec 20 2007 - 07:04:14 EST

This renames arch/x86/kernel/{i387_32.c => i387.c}.
This is a pure renaming, but paves the way for merging
the 32-bit and 64-bit versions of this code.

Signed-off-by: Roland McGrath <roland@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/kernel/Makefile_32 | 3 +-
arch/x86/kernel/i387.c | 551 +++++++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/i387_32.c | 551 -------------------------------------------
3 files changed, 553 insertions(+), 552 deletions(-)

diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32
index c7a959d..a671980 100644
--- a/arch/x86/kernel/Makefile_32
+++ b/arch/x86/kernel/Makefile_32
@@ -7,9 +7,10 @@ CPPFLAGS_vmlinux.lds += -Ui386

obj-y := process_32.o signal_32.o entry_32.o traps_32.o irq_32.o \
time_32.o ioport_32.o ldt.o setup_32.o i8259_32.o sys_i386_32.o \
- pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\
+ pci-dma_32.o i386_ksyms_32.o bootflag.o e820_32.o\
quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o io_delay.o rtc.o

+obj-y += i387.o
obj-y += ptrace.o
obj-y += ds.o
obj-y += tls.o
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
new file mode 100644
index 0000000..bebe034
--- /dev/null
+++ b/arch/x86/kernel/i387.c
@@ -0,0 +1,551 @@
+/*
+ * Copyright (C) 1994 Linus Torvalds
+ *
+ * Pentium III FXSR, SSE support
+ * General FPU state handling cleanups
+ * Gareth Hughes <gareth@xxxxxxxxxxx>, May 2000
+ */
+
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <asm/processor.h>
+#include <asm/i387.h>
+#include <asm/math_emu.h>
+#include <asm/sigcontext.h>
+#include <asm/user.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+#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;
+
+void 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;
+ if (mask == 0)
+ mask = 0x0000ffbf;
+ }
+ mxcsr_feature_mask &= mask;
+ stts();
+}
+
+/*
+ * The _current_ task is using the FPU for the first time
+ * so initialize it and set the mxcsr to its default
+ * value at reset if we support XMM instructions and then
+ * remeber the current task has used the FPU.
+ */
+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;
+ if (cpu_has_xmm)
+ tsk->thread.i387.fxsave.mxcsr = 0x1f80;
+ } 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;
+ }
+ /* only the device not available exception
+ * or ptrace can call init_fpu */
+ set_stopped_child_used_math(tsk);
+}
+
+/*
+ * FPU lazy state save handling.
+ */
+
+void kernel_fpu_begin(void)
+{
+ struct thread_info *thread = current_thread_info();
+
+ preempt_disable();
+ if (thread->status & TS_USEDFPU) {
+ __save_init_fpu(thread->task);
+ return;
+ }
+ clts();
+}
+EXPORT_SYMBOL_GPL(kernel_fpu_begin);
+
+/*
+ * FPU tag word conversions.
+ */
+
+static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
+{
+ unsigned int tmp; /* to avoid 16 bit prefixes in the code */
+
+ /* Transform each pair of bits into 01 (valid) or 00 (empty) */
+ tmp = ~twd;
+ 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);
+
+ for (i = 0; i < 8; i++) {
+ if (twd & 0x1) {
+ st = FPREG_ADDR(fxsave, (i - tos) & 7);
+
+ switch (st->exponent & 0x7fff) {
+ case 0x7fff:
+ tag = 2; /* Special */
+ break;
+ case 0x0000:
+ if (!st->significand[0] &&
+ !st->significand[1] &&
+ !st->significand[2] &&
+ !st->significand[3]) {
+ tag = 1; /* Zero */
+ } else {
+ tag = 2; /* Special */
+ }
+ break;
+ default:
+ if (st->significand[3] & 0x8000) {
+ tag = 0; /* Valid */
+ } else {
+ tag = 2; /* Special */
+ }
+ break;
+ }
+ } else {
+ tag = 3; /* Empty */
+ }
+ ret |= (tag << (2 * i));
+ twd = twd >> 1;
+ }
+ return ret;
+}
+
+/*
+ * FPU state interaction.
+ */
+
+unsigned short get_fpu_cwd(struct task_struct *tsk)
+{
+ if (cpu_has_fxsr) {
+ return tsk->thread.i387.fxsave.cwd;
+ } else {
+ return (unsigned short)tsk->thread.i387.fsave.cwd;
+ }
+}
+
+unsigned short get_fpu_swd(struct task_struct *tsk)
+{
+ if (cpu_has_fxsr) {
+ return tsk->thread.i387.fxsave.swd;
+ } else {
+ return (unsigned short)tsk->thread.i387.fsave.swd;
+ }
+}
+
+#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 */
+
+unsigned short get_fpu_mxcsr(struct task_struct *tsk)
+{
+ if (cpu_has_xmm) {
+ return tsk->thread.i387.fxsave.mxcsr;
+ } else {
+ return 0x1f80;
+ }
+}
+
+#if 0
+
+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);
+ }
+}
+
+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);
+ }
+}
+
+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);
+ }
+}
+
+#endif /* 0 */
+
+/*
+ * FXSR floating point environment conversions.
+ */
+
+static int convert_fxsr_to_user(struct _fpstate __user *buf,
+ struct i387_fxsave_struct *fxsave)
+{
+ unsigned long env[7];
+ struct _fpreg __user *to;
+ struct _fpxreg *from;
+ int i;
+
+ 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 (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
+ return 1;
+
+ 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 (__put_user(*f, t) ||
+ __put_user(*(f + 1), t + 1) ||
+ __put_user(from->exponent, &to->exponent))
+ return 1;
+ }
+ return 0;
+}
+
+static int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
+ struct _fpstate __user *buf)
+{
+ unsigned long env[7];
+ struct _fpxreg *to;
+ struct _fpreg __user *from;
+ int i;
+
+ if (__copy_from_user(env, buf, 7 * sizeof(long)))
+ return 1;
+
+ 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;
+}
+
+/*
+ * Signal frame handlers.
+ */
+
+static inline int save_i387_fsave(struct _fpstate __user *buf)
+{
+ struct task_struct *tsk = current;
+
+ 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)))
+ return -1;
+ return 1;
+}
+
+static int save_i387_fxsave(struct _fpstate __user *buf)
+{
+ struct task_struct *tsk = current;
+ int err = 0;
+
+ unlazy_fpu(tsk);
+
+ if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave))
+ return -1;
+
+ err |= __put_user(tsk->thread.i387.fxsave.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,
+ sizeof(struct i387_fxsave_struct)))
+ return -1;
+ return 1;
+}
+
+int save_i387(struct _fpstate __user *buf)
+{
+ if (!used_math())
+ return 0;
+
+ /* This will cause a "finit" to be triggered by the next
+ * attempted FPU operation by the 'current' process.
+ */
+ clear_used_math();
+
+ if (HAVE_HWFP) {
+ if (cpu_has_fxsr) {
+ return save_i387_fxsave(buf);
+ } else {
+ return save_i387_fsave(buf);
+ }
+ } else {
+ return save_i387_soft(&current->thread.i387.soft, buf);
+ }
+}
+
+static inline int restore_i387_fsave(struct _fpstate __user *buf)
+{
+ struct task_struct *tsk = current;
+ clear_fpu(tsk);
+ return __copy_from_user(&tsk->thread.i387.fsave, buf,
+ sizeof(struct i387_fsave_struct));
+}
+
+static int restore_i387_fxsave(struct _fpstate __user *buf)
+{
+ int err;
+ struct task_struct *tsk = current;
+ 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);
+}
+
+int restore_i387(struct _fpstate __user *buf)
+{
+ int err;
+
+ if (HAVE_HWFP) {
+ if (cpu_has_fxsr) {
+ err = restore_i387_fxsave(buf);
+ } else {
+ err = restore_i387_fsave(buf);
+ }
+ } else {
+ err = restore_i387_soft(&current->thread.i387.soft, buf);
+ }
+ set_used_math();
+ return err;
+}
+
+/*
+ * ptrace request handlers.
+ */
+
+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);
+}
+
+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);
+ }
+}
+
+static inline int set_fpregs_fsave(struct task_struct *tsk,
+ struct user_i387_struct __user *buf)
+{
+ return __copy_from_user(&tsk->thread.i387.fsave, buf,
+ sizeof(struct user_i387_struct));
+}
+
+static inline int set_fpregs_fxsave(struct task_struct *tsk,
+ struct user_i387_struct __user *buf)
+{
+ return convert_fxsr_from_user(&tsk->thread.i387.fxsave,
+ (struct _fpstate __user *)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);
+ }
+}
+
+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;
+ }
+}
+
+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;
+}
+
+/*
+ * FPU state for core dumps.
+ */
+
+static inline void copy_fpu_fsave(struct task_struct *tsk,
+ struct user_i387_struct *fpu)
+{
+ memcpy(fpu, &tsk->thread.i387.fsave,
+ sizeof(struct user_i387_struct));
+}
+
+static inline void copy_fpu_fxsave(struct task_struct *tsk,
+ struct user_i387_struct *fpu)
+{
+ unsigned short *to;
+ unsigned short *from;
+ int i;
+
+ memcpy(fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long));
+
+ to = (unsigned short *)&fpu->st_space[0];
+ from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0];
+ for (i = 0; i < 8; i++, to += 5, from += 8)
+ memcpy(to, from, 5 * sizeof(unsigned short));
+}
+
+int dump_fpu(struct pt_regs *regs, struct user_i387_struct *fpu)
+{
+ int fpvalid;
+ struct task_struct *tsk = current;
+
+ fpvalid = !!used_math();
+ if (fpvalid) {
+ unlazy_fpu(tsk);
+ if (cpu_has_fxsr) {
+ copy_fpu_fxsave(tsk, fpu);
+ } else {
+ copy_fpu_fsave(tsk, fpu);
+ }
+ }
+
+ return fpvalid;
+}
+EXPORT_SYMBOL(dump_fpu);
+
+int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
+{
+ int fpvalid = !!tsk_used_math(tsk);
+
+ if (fpvalid) {
+ if (tsk == current)
+ unlazy_fpu(tsk);
+ if (cpu_has_fxsr)
+ copy_fpu_fxsave(tsk, fpu);
+ else
+ copy_fpu_fsave(tsk, fpu);
+ }
+ return fpvalid;
+}
+
+int dump_task_extended_fpu(struct task_struct *tsk,
+ struct user_fxsr_struct *fpu)
+{
+ int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;
+
+ if (fpvalid) {
+ if (tsk == current)
+ unlazy_fpu(tsk);
+ memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(*fpu));
+ }
+ return fpvalid;
+}
diff --git a/arch/x86/kernel/i387_32.c b/arch/x86/kernel/i387_32.c
deleted file mode 100644
index bebe034..0000000
--- a/arch/x86/kernel/i387_32.c
+++ /dev/null
@@ -1,551 +0,0 @@
-/*
- * Copyright (C) 1994 Linus Torvalds
- *
- * Pentium III FXSR, SSE support
- * General FPU state handling cleanups
- * Gareth Hughes <gareth@xxxxxxxxxxx>, May 2000
- */
-
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/math_emu.h>
-#include <asm/sigcontext.h>
-#include <asm/user.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-
-#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;
-
-void 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;
- if (mask == 0)
- mask = 0x0000ffbf;
- }
- mxcsr_feature_mask &= mask;
- stts();
-}
-
-/*
- * The _current_ task is using the FPU for the first time
- * so initialize it and set the mxcsr to its default
- * value at reset if we support XMM instructions and then
- * remeber the current task has used the FPU.
- */
-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;
- if (cpu_has_xmm)
- tsk->thread.i387.fxsave.mxcsr = 0x1f80;
- } 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;
- }
- /* only the device not available exception
- * or ptrace can call init_fpu */
- set_stopped_child_used_math(tsk);
-}
-
-/*
- * FPU lazy state save handling.
- */
-
-void kernel_fpu_begin(void)
-{
- struct thread_info *thread = current_thread_info();
-
- preempt_disable();
- if (thread->status & TS_USEDFPU) {
- __save_init_fpu(thread->task);
- return;
- }
- clts();
-}
-EXPORT_SYMBOL_GPL(kernel_fpu_begin);
-
-/*
- * FPU tag word conversions.
- */
-
-static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
-{
- unsigned int tmp; /* to avoid 16 bit prefixes in the code */
-
- /* Transform each pair of bits into 01 (valid) or 00 (empty) */
- tmp = ~twd;
- 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);
-
- for (i = 0; i < 8; i++) {
- if (twd & 0x1) {
- st = FPREG_ADDR(fxsave, (i - tos) & 7);
-
- switch (st->exponent & 0x7fff) {
- case 0x7fff:
- tag = 2; /* Special */
- break;
- case 0x0000:
- if (!st->significand[0] &&
- !st->significand[1] &&
- !st->significand[2] &&
- !st->significand[3]) {
- tag = 1; /* Zero */
- } else {
- tag = 2; /* Special */
- }
- break;
- default:
- if (st->significand[3] & 0x8000) {
- tag = 0; /* Valid */
- } else {
- tag = 2; /* Special */
- }
- break;
- }
- } else {
- tag = 3; /* Empty */
- }
- ret |= (tag << (2 * i));
- twd = twd >> 1;
- }
- return ret;
-}
-
-/*
- * FPU state interaction.
- */
-
-unsigned short get_fpu_cwd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.cwd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.cwd;
- }
-}
-
-unsigned short get_fpu_swd(struct task_struct *tsk)
-{
- if (cpu_has_fxsr) {
- return tsk->thread.i387.fxsave.swd;
- } else {
- return (unsigned short)tsk->thread.i387.fsave.swd;
- }
-}
-
-#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 */
-
-unsigned short get_fpu_mxcsr(struct task_struct *tsk)
-{
- if (cpu_has_xmm) {
- return tsk->thread.i387.fxsave.mxcsr;
- } else {
- return 0x1f80;
- }
-}
-
-#if 0
-
-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);
- }
-}
-
-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);
- }
-}
-
-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);
- }
-}
-
-#endif /* 0 */
-
-/*
- * FXSR floating point environment conversions.
- */
-
-static int convert_fxsr_to_user(struct _fpstate __user *buf,
- struct i387_fxsave_struct *fxsave)
-{
- unsigned long env[7];
- struct _fpreg __user *to;
- struct _fpxreg *from;
- int i;
-
- 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 (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
- return 1;
-
- 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 (__put_user(*f, t) ||
- __put_user(*(f + 1), t + 1) ||
- __put_user(from->exponent, &to->exponent))
- return 1;
- }
- return 0;
-}
-
-static int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
- struct _fpstate __user *buf)
-{
- unsigned long env[7];
- struct _fpxreg *to;
- struct _fpreg __user *from;
- int i;
-
- if (__copy_from_user(env, buf, 7 * sizeof(long)))
- return 1;
-
- 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;
-}
-
-/*
- * Signal frame handlers.
- */
-
-static inline int save_i387_fsave(struct _fpstate __user *buf)
-{
- struct task_struct *tsk = current;
-
- 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)))
- return -1;
- return 1;
-}
-
-static int save_i387_fxsave(struct _fpstate __user *buf)
-{
- struct task_struct *tsk = current;
- int err = 0;
-
- unlazy_fpu(tsk);
-
- if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave))
- return -1;
-
- err |= __put_user(tsk->thread.i387.fxsave.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,
- sizeof(struct i387_fxsave_struct)))
- return -1;
- return 1;
-}
-
-int save_i387(struct _fpstate __user *buf)
-{
- if (!used_math())
- return 0;
-
- /* This will cause a "finit" to be triggered by the next
- * attempted FPU operation by the 'current' process.
- */
- clear_used_math();
-
- if (HAVE_HWFP) {
- if (cpu_has_fxsr) {
- return save_i387_fxsave(buf);
- } else {
- return save_i387_fsave(buf);
- }
- } else {
- return save_i387_soft(&current->thread.i387.soft, buf);
- }
-}
-
-static inline int restore_i387_fsave(struct _fpstate __user *buf)
-{
- struct task_struct *tsk = current;
- clear_fpu(tsk);
- return __copy_from_user(&tsk->thread.i387.fsave, buf,
- sizeof(struct i387_fsave_struct));
-}
-
-static int restore_i387_fxsave(struct _fpstate __user *buf)
-{
- int err;
- struct task_struct *tsk = current;
- 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);
-}
-
-int restore_i387(struct _fpstate __user *buf)
-{
- int err;
-
- if (HAVE_HWFP) {
- if (cpu_has_fxsr) {
- err = restore_i387_fxsave(buf);
- } else {
- err = restore_i387_fsave(buf);
- }
- } else {
- err = restore_i387_soft(&current->thread.i387.soft, buf);
- }
- set_used_math();
- return err;
-}
-
-/*
- * ptrace request handlers.
- */
-
-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);
-}
-
-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);
- }
-}
-
-static inline int set_fpregs_fsave(struct task_struct *tsk,
- struct user_i387_struct __user *buf)
-{
- return __copy_from_user(&tsk->thread.i387.fsave, buf,
- sizeof(struct user_i387_struct));
-}
-
-static inline int set_fpregs_fxsave(struct task_struct *tsk,
- struct user_i387_struct __user *buf)
-{
- return convert_fxsr_from_user(&tsk->thread.i387.fxsave,
- (struct _fpstate __user *)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);
- }
-}
-
-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;
- }
-}
-
-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;
-}
-
-/*
- * FPU state for core dumps.
- */
-
-static inline void copy_fpu_fsave(struct task_struct *tsk,
- struct user_i387_struct *fpu)
-{
- memcpy(fpu, &tsk->thread.i387.fsave,
- sizeof(struct user_i387_struct));
-}
-
-static inline void copy_fpu_fxsave(struct task_struct *tsk,
- struct user_i387_struct *fpu)
-{
- unsigned short *to;
- unsigned short *from;
- int i;
-
- memcpy(fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long));
-
- to = (unsigned short *)&fpu->st_space[0];
- from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0];
- for (i = 0; i < 8; i++, to += 5, from += 8)
- memcpy(to, from, 5 * sizeof(unsigned short));
-}
-
-int dump_fpu(struct pt_regs *regs, struct user_i387_struct *fpu)
-{
- int fpvalid;
- struct task_struct *tsk = current;
-
- fpvalid = !!used_math();
- if (fpvalid) {
- unlazy_fpu(tsk);
- if (cpu_has_fxsr) {
- copy_fpu_fxsave(tsk, fpu);
- } else {
- copy_fpu_fsave(tsk, fpu);
- }
- }
-
- return fpvalid;
-}
-EXPORT_SYMBOL(dump_fpu);
-
-int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
-{
- int fpvalid = !!tsk_used_math(tsk);
-
- if (fpvalid) {
- if (tsk == current)
- unlazy_fpu(tsk);
- if (cpu_has_fxsr)
- copy_fpu_fxsave(tsk, fpu);
- else
- copy_fpu_fsave(tsk, fpu);
- }
- return fpvalid;
-}
-
-int dump_task_extended_fpu(struct task_struct *tsk,
- struct user_fxsr_struct *fpu)
-{
- int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;
-
- if (fpvalid) {
- if (tsk == current)
- unlazy_fpu(tsk);
- memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(*fpu));
- }
- return fpvalid;
-}
--
1.5.3.6

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