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x86: x86 i387 user_regset
This revamps the i387 code to be shared across 32-bit, 64-bit, and 32-on-64. It does so by consolidating the code in one place based on the user_regset accessor interfaces. This switches 32-bit to using the i387_64.h header and 64-bit to using the i387.c that was previously i387_32.c, but that's what took the least cleanup in each file. Here i387.h is stubbed to always include i387_64.h rather than renaming the file, to keep this diff smaller and easier to read. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Roland McGrath
Ingo Molnar
parent
b7b71725fb
commit
4421011120
@ -3,7 +3,7 @@
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#
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obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o \
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ia32_binfmt.o fpu32.o
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ia32_binfmt.o
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sysv-$(CONFIG_SYSVIPC) := ipc32.o
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obj-$(CONFIG_IA32_EMULATION) += $(sysv-y)
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@ -29,7 +29,6 @@
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#include <asm/ia32_unistd.h>
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#include <asm/user32.h>
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#include <asm/sigcontext32.h>
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#include <asm/fpu32.h>
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#include <asm/proto.h>
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#include <asm/vdso.h>
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@ -258,7 +257,7 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
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if (buf) {
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if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
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goto badframe;
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err |= restore_i387_ia32(current, buf, 0);
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err |= restore_i387_ia32(buf);
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} else {
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struct task_struct *me = current;
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@ -377,7 +376,7 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
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err |= __put_user((u32)regs->flags, &sc->flags);
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err |= __put_user((u32)regs->sp, &sc->sp_at_signal);
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tmp = save_i387_ia32(current, fpstate, regs, 0);
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tmp = save_i387_ia32(fpstate);
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if (tmp < 0)
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err = -EFAULT;
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else {
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@ -7,7 +7,7 @@ CPPFLAGS_vmlinux.lds += -Ux86_64
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obj-y := process_64.o signal_64.o entry_64.o traps_64.o irq_64.o \
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time_64.o ioport_64.o ldt.o setup_64.o i8259_64.o sys_x86_64.o \
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x8664_ksyms_64.o i387_64.o syscall_64.o vsyscall_64.o \
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x8664_ksyms_64.o syscall_64.o vsyscall_64.o \
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setup64.o bootflag.o e820_64.o reboot_64.o quirks.o i8237.o \
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pci-dma_64.o pci-nommu_64.o alternative.o hpet.o tsc_64.o bugs_64.o \
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i8253.o io_delay.o rtc.o
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@ -16,6 +16,7 @@ obj-y += ptrace.o
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obj-y += ds.o
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obj-y += step.o
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obj-y += i387.o
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obj-$(CONFIG_IA32_EMULATION) += tls.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-y += cpu/
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@ -8,6 +8,7 @@
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/regset.h>
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#include <asm/processor.h>
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#include <asm/i387.h>
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#include <asm/math_emu.h>
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@ -16,13 +17,29 @@
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#include <asm/ptrace.h>
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#include <asm/uaccess.h>
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#ifdef CONFIG_X86_64
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#include <asm/sigcontext32.h>
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#include <asm/user32.h>
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#else
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#define save_i387_ia32 save_i387
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#define restore_i387_ia32 restore_i387
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#define _fpstate_ia32 _fpstate
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#define user_i387_ia32_struct user_i387_struct
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#define user32_fxsr_struct user_fxsr_struct
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#endif
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#ifdef CONFIG_MATH_EMULATION
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#define HAVE_HWFP (boot_cpu_data.hard_math)
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#else
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#define HAVE_HWFP 1
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#endif
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static unsigned long mxcsr_feature_mask __read_mostly = 0xffffffff;
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unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
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void mxcsr_feature_mask_init(void)
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{
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@ -40,6 +57,30 @@ void mxcsr_feature_mask_init(void)
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stts();
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}
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#ifdef CONFIG_X86_64
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/*
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* Called at bootup to set up the initial FPU state that is later cloned
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* into all processes.
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*/
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void __cpuinit fpu_init(void)
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{
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unsigned long oldcr0 = read_cr0();
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extern void __bad_fxsave_alignment(void);
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if (offsetof(struct task_struct, thread.i387.fxsave) & 15)
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__bad_fxsave_alignment();
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set_in_cr4(X86_CR4_OSFXSR);
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set_in_cr4(X86_CR4_OSXMMEXCPT);
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write_cr0(oldcr0 & ~((1UL<<3)|(1UL<<2))); /* clear TS and EM */
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mxcsr_feature_mask_init();
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/* clean state in init */
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current_thread_info()->status = 0;
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clear_used_math();
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}
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#endif /* CONFIG_X86_64 */
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/*
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* The _current_ task is using the FPU for the first time
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* so initialize it and set the mxcsr to its default
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@ -48,12 +89,18 @@ void mxcsr_feature_mask_init(void)
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*/
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void init_fpu(struct task_struct *tsk)
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{
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if (tsk_used_math(tsk)) {
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if (tsk == current)
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unlazy_fpu(tsk);
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return;
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}
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if (cpu_has_fxsr) {
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memset(&tsk->thread.i387.fxsave, 0,
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sizeof(struct i387_fxsave_struct));
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tsk->thread.i387.fxsave.cwd = 0x37f;
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if (cpu_has_xmm)
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tsk->thread.i387.fxsave.mxcsr = 0x1f80;
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tsk->thread.i387.fxsave.mxcsr = MXCSR_DEFAULT;
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} else {
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memset(&tsk->thread.i387.fsave, 0,
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sizeof(struct i387_fsave_struct));
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@ -62,27 +109,59 @@ void init_fpu(struct task_struct *tsk)
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tsk->thread.i387.fsave.twd = 0xffffffffu;
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tsk->thread.i387.fsave.fos = 0xffff0000u;
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}
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/* only the device not available exception
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* or ptrace can call init_fpu */
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/*
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* Only the device not available exception or ptrace can call init_fpu.
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*/
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set_stopped_child_used_math(tsk);
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}
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/*
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* FPU lazy state save handling.
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*/
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void kernel_fpu_begin(void)
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int fpregs_active(struct task_struct *target, const struct user_regset *regset)
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{
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struct thread_info *thread = current_thread_info();
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preempt_disable();
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if (thread->status & TS_USEDFPU) {
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__save_init_fpu(thread->task);
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return;
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}
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clts();
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return tsk_used_math(target) ? regset->n : 0;
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}
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EXPORT_SYMBOL_GPL(kernel_fpu_begin);
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int xfpregs_active(struct task_struct *target, const struct user_regset *regset)
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{
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return (cpu_has_fxsr && tsk_used_math(target)) ? regset->n : 0;
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}
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int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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if (!cpu_has_fxsr)
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return -ENODEV;
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unlazy_fpu(target);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.i387.fxsave, 0, -1);
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}
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int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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if (!cpu_has_fxsr)
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return -ENODEV;
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unlazy_fpu(target);
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set_stopped_child_used_math(target);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.i387.fxsave, 0, -1);
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/*
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* mxcsr reserved bits must be masked to zero for security reasons.
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*/
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target->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
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return ret;
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}
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#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
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/*
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* FPU tag word conversions.
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@ -94,210 +173,187 @@ static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
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/* Transform each pair of bits into 01 (valid) or 00 (empty) */
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tmp = ~twd;
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tmp = (tmp | (tmp >> 1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
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tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
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/* and move the valid bits to the lower byte. */
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tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
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tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
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tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
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return tmp;
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}
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static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
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#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
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#define FP_EXP_TAG_VALID 0
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#define FP_EXP_TAG_ZERO 1
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#define FP_EXP_TAG_SPECIAL 2
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#define FP_EXP_TAG_EMPTY 3
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static inline u32 twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
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{
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struct _fpxreg *st = NULL;
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unsigned long tos = (fxsave->swd >> 11) & 7;
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unsigned long twd = (unsigned long) fxsave->twd;
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unsigned long tag;
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unsigned long ret = 0xffff0000u;
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struct _fpxreg *st;
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u32 tos = (fxsave->swd >> 11) & 7;
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u32 twd = (unsigned long) fxsave->twd;
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u32 tag;
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u32 ret = 0xffff0000u;
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int i;
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#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
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for (i = 0; i < 8; i++) {
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for (i = 0; i < 8; i++, twd >>= 1) {
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if (twd & 0x1) {
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st = FPREG_ADDR(fxsave, (i - tos) & 7);
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switch (st->exponent & 0x7fff) {
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case 0x7fff:
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tag = 2; /* Special */
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tag = FP_EXP_TAG_SPECIAL;
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break;
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case 0x0000:
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if (!st->significand[0] &&
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!st->significand[1] &&
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!st->significand[2] &&
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!st->significand[3]) {
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tag = 1; /* Zero */
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} else {
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tag = 2; /* Special */
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}
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!st->significand[3])
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tag = FP_EXP_TAG_ZERO;
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else
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tag = FP_EXP_TAG_SPECIAL;
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break;
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default:
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if (st->significand[3] & 0x8000) {
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tag = 0; /* Valid */
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} else {
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tag = 2; /* Special */
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}
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if (st->significand[3] & 0x8000)
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tag = FP_EXP_TAG_VALID;
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else
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tag = FP_EXP_TAG_SPECIAL;
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break;
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}
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} else {
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tag = 3; /* Empty */
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tag = FP_EXP_TAG_EMPTY;
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}
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ret |= (tag << (2 * i));
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twd = twd >> 1;
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ret |= tag << (2 * i);
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}
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return ret;
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}
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/*
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* FPU state interaction.
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*/
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unsigned short get_fpu_cwd(struct task_struct *tsk)
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{
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if (cpu_has_fxsr) {
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return tsk->thread.i387.fxsave.cwd;
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} else {
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return (unsigned short)tsk->thread.i387.fsave.cwd;
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}
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}
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unsigned short get_fpu_swd(struct task_struct *tsk)
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{
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if (cpu_has_fxsr) {
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return tsk->thread.i387.fxsave.swd;
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} else {
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return (unsigned short)tsk->thread.i387.fsave.swd;
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}
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}
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#if 0
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unsigned short get_fpu_twd(struct task_struct *tsk)
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{
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if (cpu_has_fxsr) {
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return tsk->thread.i387.fxsave.twd;
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} else {
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return (unsigned short)tsk->thread.i387.fsave.twd;
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}
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}
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#endif /* 0 */
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unsigned short get_fpu_mxcsr(struct task_struct *tsk)
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{
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if (cpu_has_xmm) {
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return tsk->thread.i387.fxsave.mxcsr;
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} else {
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return 0x1f80;
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}
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}
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#if 0
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void set_fpu_cwd(struct task_struct *tsk, unsigned short cwd)
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{
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if (cpu_has_fxsr) {
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tsk->thread.i387.fxsave.cwd = cwd;
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} else {
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tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000u);
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}
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}
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void set_fpu_swd(struct task_struct *tsk, unsigned short swd)
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{
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if (cpu_has_fxsr) {
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tsk->thread.i387.fxsave.swd = swd;
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} else {
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tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000u);
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}
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}
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void set_fpu_twd(struct task_struct *tsk, unsigned short twd)
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{
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if (cpu_has_fxsr) {
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tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd);
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} else {
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tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000u);
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}
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}
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#endif /* 0 */
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/*
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* FXSR floating point environment conversions.
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*/
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static int convert_fxsr_to_user(struct _fpstate __user *buf,
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struct i387_fxsave_struct *fxsave)
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static void convert_from_fxsr(struct user_i387_ia32_struct *env,
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struct task_struct *tsk)
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{
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unsigned long env[7];
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struct _fpreg __user *to;
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struct _fpxreg *from;
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struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
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struct _fpreg *to = (struct _fpreg *) &env->st_space[0];
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struct _fpxreg *from = (struct _fpxreg *) &fxsave->st_space[0];
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int i;
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env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
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env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
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env[2] = twd_fxsr_to_i387(fxsave);
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env[3] = fxsave->fip;
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env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
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env[5] = fxsave->foo;
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env[6] = fxsave->fos;
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env->cwd = fxsave->cwd | 0xffff0000u;
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env->swd = fxsave->swd | 0xffff0000u;
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env->twd = twd_fxsr_to_i387(fxsave);
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if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
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return 1;
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to = &buf->_st[0];
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from = (struct _fpxreg *) &fxsave->st_space[0];
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for (i = 0; i < 8; i++, to++, from++) {
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unsigned long __user *t = (unsigned long __user *)to;
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unsigned long *f = (unsigned long *)from;
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if (__put_user(*f, t) ||
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__put_user(*(f + 1), t + 1) ||
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__put_user(from->exponent, &to->exponent))
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return 1;
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#ifdef CONFIG_X86_64
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env->fip = fxsave->rip;
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env->foo = fxsave->rdp;
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if (tsk == current) {
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/*
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* should be actually ds/cs at fpu exception time, but
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* that information is not available in 64bit mode.
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*/
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asm("mov %%ds,%0" : "=r" (env->fos));
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asm("mov %%cs,%0" : "=r" (env->fcs));
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} else {
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struct pt_regs *regs = task_pt_regs(tsk);
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env->fos = 0xffff0000 | tsk->thread.ds;
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env->fcs = regs->cs;
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}
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return 0;
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#else
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env->fip = fxsave->fip;
|
||||
env->fcs = fxsave->fcs;
|
||||
env->foo = fxsave->foo;
|
||||
env->fos = fxsave->fos;
|
||||
#endif
|
||||
|
||||
for (i = 0; i < 8; ++i)
|
||||
memcpy(&to[i], &from[i], sizeof(to[0]));
|
||||
}
|
||||
|
||||
static int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
|
||||
struct _fpstate __user *buf)
|
||||
static void convert_to_fxsr(struct task_struct *tsk,
|
||||
const struct user_i387_ia32_struct *env)
|
||||
|
||||
{
|
||||
unsigned long env[7];
|
||||
struct _fpxreg *to;
|
||||
struct _fpreg __user *from;
|
||||
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;
|
||||
|
||||
if (__copy_from_user(env, buf, 7 * sizeof(long)))
|
||||
return 1;
|
||||
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
|
||||
|
||||
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];
|
||||
for (i = 0; i < 8; ++i)
|
||||
memcpy(&to[i], &from[i], sizeof(from[0]));
|
||||
}
|
||||
|
||||
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;
|
||||
int fpregs_get(struct task_struct *target, const struct user_regset *regset,
|
||||
unsigned int pos, unsigned int count,
|
||||
void *kbuf, void __user *ubuf)
|
||||
{
|
||||
struct user_i387_ia32_struct env;
|
||||
|
||||
if (__get_user(*t, f) ||
|
||||
__get_user(*(t + 1), f + 1) ||
|
||||
__get_user(to->exponent, &from->exponent))
|
||||
return 1;
|
||||
if (!HAVE_HWFP)
|
||||
return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
|
||||
|
||||
unlazy_fpu(target);
|
||||
|
||||
if (!cpu_has_fxsr)
|
||||
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
||||
&target->thread.i387.fsave, 0, -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);
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
struct user_i387_ia32_struct env;
|
||||
int ret;
|
||||
|
||||
if (!HAVE_HWFP)
|
||||
return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
|
||||
|
||||
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;
|
||||
|
||||
@ -309,14 +365,16 @@ static inline int save_i387_fsave(struct _fpstate __user *buf)
|
||||
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);
|
||||
@ -330,7 +388,7 @@ static int save_i387_fxsave(struct _fpstate __user *buf)
|
||||
return 1;
|
||||
}
|
||||
|
||||
int save_i387(struct _fpstate __user *buf)
|
||||
int save_i387_ia32(struct _fpstate_ia32 __user *buf)
|
||||
{
|
||||
if (!used_math())
|
||||
return 0;
|
||||
@ -347,11 +405,13 @@ int save_i387(struct _fpstate __user *buf)
|
||||
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);
|
||||
@ -359,19 +419,23 @@ static inline int restore_i387_fsave(struct _fpstate __user *buf)
|
||||
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;
|
||||
|
||||
@ -382,101 +446,52 @@ int restore_i387(struct _fpstate __user *buf)
|
||||
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);
|
||||
}
|
||||
}
|
||||
|
||||
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);
|
||||
return xfpregs_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 xfpregs_set(tsk, NULL, 0, sizeof(*buf), NULL, buf);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk)
|
||||
{
|
||||
return fpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
|
||||
}
|
||||
|
||||
int set_fpregs(struct task_struct *tsk, struct user_i387_struct __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.
|
||||
*/
|
||||
@ -538,7 +553,7 @@ int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
|
||||
@ -886,7 +886,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
||||
#include <linux/compat.h>
|
||||
#include <linux/syscalls.h>
|
||||
#include <asm/ia32.h>
|
||||
#include <asm/fpu32.h>
|
||||
#include <asm/user32.h>
|
||||
|
||||
#define R32(l,q) \
|
||||
|
||||
@ -1,10 +0,0 @@
|
||||
#ifndef _FPU32_H
|
||||
#define _FPU32_H 1
|
||||
|
||||
struct _fpstate_ia32;
|
||||
|
||||
int restore_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf, int fsave);
|
||||
int save_i387_ia32(struct task_struct *tsk, struct _fpstate_ia32 __user *buf,
|
||||
struct pt_regs *regs, int fsave);
|
||||
|
||||
#endif
|
||||
@ -1,5 +1 @@
|
||||
#ifdef CONFIG_X86_32
|
||||
# include "i387_32.h"
|
||||
#else
|
||||
# include "i387_64.h"
|
||||
#endif
|
||||
#include "i387_64.h"
|
||||
|
||||
@ -12,6 +12,7 @@
|
||||
|
||||
#include <linux/sched.h>
|
||||
#include <linux/kernel_stat.h>
|
||||
#include <linux/regset.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/sigcontext.h>
|
||||
#include <asm/user.h>
|
||||
@ -23,6 +24,16 @@ extern void mxcsr_feature_mask_init(void);
|
||||
extern void init_fpu(struct task_struct *child);
|
||||
extern asmlinkage void math_state_restore(void);
|
||||
|
||||
extern user_regset_active_fn fpregs_active, xfpregs_active;
|
||||
extern user_regset_get_fn fpregs_get, xfpregs_get, fpregs_soft_get;
|
||||
extern user_regset_set_fn fpregs_set, xfpregs_set, fpregs_soft_set;
|
||||
|
||||
#ifdef CONFIG_IA32_EMULATION
|
||||
struct _fpstate_ia32;
|
||||
extern int save_i387_ia32(struct _fpstate_ia32 __user *buf);
|
||||
extern int restore_i387_ia32(struct _fpstate_ia32 __user *buf);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
|
||||
/* Ignore delayed exceptions from user space */
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user