diff options
Diffstat (limited to 'sysdeps/mach/hurd/x86_64')
| -rw-r--r-- | sysdeps/mach/hurd/x86_64/bits/sigcontext.h | 2 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/x86_64/sigreturn.c | 32 |
2 files changed, 30 insertions, 4 deletions
diff --git a/sysdeps/mach/hurd/x86_64/bits/sigcontext.h b/sysdeps/mach/hurd/x86_64/bits/sigcontext.h index 7bac881176..d83795fcbc 100644 --- a/sysdeps/mach/hurd/x86_64/bits/sigcontext.h +++ b/sysdeps/mach/hurd/x86_64/bits/sigcontext.h @@ -96,6 +96,8 @@ struct sigcontext struct i386_fp_save sc_fpsave; struct i386_fp_regs sc_fpregs; int sc_fpexcsr; /* FPSR including exception bits. */ + + struct i386_xfloat_state *xstate; }; /* Traditional BSD names for some members. */ diff --git a/sysdeps/mach/hurd/x86_64/sigreturn.c b/sysdeps/mach/hurd/x86_64/sigreturn.c index 81a2d3ba74..dff8e76dc8 100644 --- a/sysdeps/mach/hurd/x86_64/sigreturn.c +++ b/sysdeps/mach/hurd/x86_64/sigreturn.c @@ -20,6 +20,8 @@ #include <hurd/msg.h> #include <stdlib.h> +#include <cpuid.h> + /* This is run on the thread stack after restoring it, to be able to unlock SS off sigstack. */ void @@ -116,10 +118,32 @@ __sigreturn (struct sigcontext *scp) if (scp->sc_onstack) ss->sigaltstack.ss_flags &= ~SS_ONSTACK; - if (scp->sc_fpused) - /* Restore the FPU state. Mach conveniently stores the state - in the format the i387 `frstor' instruction uses to restore it. */ - asm volatile ("frstor %0" : : "m" (scp->sc_fpsave)); +#ifdef i386_XFLOAT_STATE + if ((scp->xstate) && (scp->xstate->initialized)) + { + unsigned eax, ebx, ecx, edx; + __cpuid_count(0xd, 0, eax, ebx, ecx, edx); + switch (scp->xstate->fp_save_kind) + { + case 0: // FNSAVE + asm volatile("frstor %0" : : "m" (scp->xstate->hw_state)); + break; + case 1: // FXSAVE + asm volatile("fxrstor %0" : : "m" (scp->xstate->hw_state), \ + "a" (eax), "d" (edx)); + break; + default: // XSAVE, XSAVEOPT, XSAVEC, XSAVES + asm volatile("xrstor %0" : : "m" (scp->xstate->hw_state), \ + "a" (eax), "d" (edx)); + break; + } + } + else +#endif + if (scp->sc_fpused) + /* Restore the FPU state. Mach conveniently stores the state + in the format the i387 `frstor' instruction uses to restore it. */ + asm volatile ("frstor %0" : : "m" (scp->sc_fpsave)); /* Copy the registers onto the user's stack, to be able to release the altstack (by unlocking sigstate). Note that unless an altstack is used, |