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Make the arch_prctl system call use the saved %gs and %fs mechanism.

This commit is contained in:
fvdl 2005-05-15 21:43:08 +00:00
parent 2f9b8a3b68
commit 49395ac65e
1 changed files with 39 additions and 24 deletions
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63
sys/compat/linux/arch/amd64/linux_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_machdep.c,v 1.1 2005/05/03 16:26:30 manu Exp $ */
/* $NetBSD: linux_machdep.c,v 1.2 2005/05/15 21:43:08 fvdl Exp $ */
/*-
* Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved.
@ -33,7 +33,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.1 2005/05/03 16:26:30 manu Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.2 2005/05/15 21:43:08 fvdl Exp $");
#include <sys/param.h>
#include <sys/types.h>
@ -49,6 +49,8 @@ __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.1 2005/05/03 16:26:30 manu Exp $
#include <machine/pcb.h>
#include <machine/fpu.h>
#include <machine/mcontext.h>
#include <machine/specialreg.h>
#include <machine/vmparam.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_errno.h>
@ -454,41 +456,55 @@ linux_sys_arch_prctl(l, v, retval)
syscallarg(int) code;
syscallarg(unsigned long) addr;
} */ *uap = v;
ucontext_t uctx;
struct pcb *pcb = &l->l_addr->u_pcb;
struct trapframe *tf = l->l_md.md_regs;
int error;
getucontext(l, &uctx);
uint64_t taddr;
switch(SCARG(uap, code)) {
case LINUX_ARCH_SET_GS:
#ifndef tmp_hack
return 0; /* XXX */
#endif
uctx.uc_mcontext.__gregs[_REG_GS] = (u_int64_t)SCARG(uap, addr);
if ((error = setucontext(l, &uctx)) != 0)
return error;
taddr = SCARG(uap, addr);
if (taddr >= VM_MAXUSER_ADDRESS)
return EINVAL;
pcb->pcb_gs = taddr;
pcb->pcb_flags |= PCB_GS64;
if (l == curlwp)
wrmsr(MSR_KERNELGSBASE, taddr);
break;
case LINUX_ARCH_GET_GS:
if ((error = copyout(&uctx.uc_mcontext.__gregs[_REG_GS],
(char *)SCARG(uap, addr),
sizeof(uctx.uc_mcontext.__gregs[_REG_GS]))) != 0)
if (pcb->pcb_flags & PCB_GS64)
taddr = pcb->pcb_gs;
else {
error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr);
if (error != 0)
return error;
}
error = copyout(&taddr, (char *)SCARG(uap, addr), 8);
if (error != 0)
return error;
break;
case LINUX_ARCH_SET_FS:
#ifndef tmp_hack
return 0; /* XXX */
#endif
uctx.uc_mcontext.__gregs[_REG_FS] = (u_int64_t)SCARG(uap, addr);
if ((error = setucontext(l, &uctx)) != 0)
return error;
taddr = SCARG(uap, addr);
if (taddr >= VM_MAXUSER_ADDRESS)
return EINVAL;
pcb->pcb_fs = taddr;
pcb->pcb_flags |= PCB_FS64;
if (l == curlwp)
wrmsr(MSR_FSBASE, taddr);
break;
case LINUX_ARCH_GET_FS:
if ((error = copyout(&uctx.uc_mcontext.__gregs[_REG_FS],
(char *)SCARG(uap, addr),
sizeof(uctx.uc_mcontext.__gregs[_REG_FS]))) != 0)
if (pcb->pcb_flags & PCB_FS64)
taddr = pcb->pcb_fs;
else {
error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr);
if (error != 0)
return error;
}
error = copyout(&taddr, (char *)SCARG(uap, addr), 8);
if (error != 0)
return error;
break;
@ -498,7 +514,6 @@ linux_sys_arch_prctl(l, v, retval)
SCARG(uap, code));
#endif
return EINVAL;
break;
}
return 0;