mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 02:25:02 +07:00
c7ea591c91
analog of [PATCH] i386: let usermode execute the "enter" instruction from circa 2006. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __UM_PROCESSOR_I386_H
|
|
#define __UM_PROCESSOR_I386_H
|
|
|
|
#include <linux/string.h>
|
|
#include <sysdep/host_ldt.h>
|
|
#include <asm/segment.h>
|
|
|
|
extern int host_has_cmov;
|
|
|
|
struct uml_tls_struct {
|
|
struct user_desc tls;
|
|
unsigned flushed:1;
|
|
unsigned present:1;
|
|
};
|
|
|
|
struct arch_thread {
|
|
struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
|
|
unsigned long debugregs[8];
|
|
int debugregs_seq;
|
|
struct faultinfo faultinfo;
|
|
};
|
|
|
|
#define INIT_ARCH_THREAD { \
|
|
.tls_array = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
|
|
{ .present = 0, .flushed = 0 } }, \
|
|
.debugregs = { [ 0 ... 7 ] = 0 }, \
|
|
.debugregs_seq = 0, \
|
|
.faultinfo = { 0, 0, 0 } \
|
|
}
|
|
|
|
static inline void arch_flush_thread(struct arch_thread *thread)
|
|
{
|
|
/* Clear any TLS still hanging */
|
|
memset(&thread->tls_array, 0, sizeof(thread->tls_array));
|
|
}
|
|
|
|
static inline void arch_copy_thread(struct arch_thread *from,
|
|
struct arch_thread *to)
|
|
{
|
|
memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
|
|
}
|
|
|
|
#include <asm/user.h>
|
|
|
|
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
|
|
static inline void rep_nop(void)
|
|
{
|
|
__asm__ __volatile__("rep;nop": : :"memory");
|
|
}
|
|
|
|
#define cpu_relax() rep_nop()
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter"). Stolen
|
|
* from asm-i386/processor.h
|
|
*/
|
|
#define current_text_addr() \
|
|
({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
|
|
|
|
#define KSTK_EIP(tsk) KSTK_REG(tsk, EIP)
|
|
#define KSTK_ESP(tsk) KSTK_REG(tsk, UESP)
|
|
#define KSTK_EBP(tsk) KSTK_REG(tsk, EBP)
|
|
|
|
#endif
|