701ac88055
SEL_UPL and sometimes PSL_VM. This is just a style change on amd64, but on i386 it fixes 1 unimportant place where the PSL_VM check was missing and starts fixing 1 important place where the PSL_VM check had a logic error. Fix logic errors in treating vm86 bioscall mode as kernel mode. The main place checked all the necessary flags, but put the necessary parentheses for the PSL_VM and PCB_VM86CALL checks in the wrong place. The broken case is only reached if a vm86 bioscall uses a %cs which is nonzero mod 4, but that is unusual -- most bios calls start with %cs = 0xc000 or 0xf000 and rarely change it. Another place was missing the check for PCB_VM86CALL, but was only reachable if there are bugs virtualizing PSL_I. Add a macro TF_HAS_STACKREGS() and use this instead of converting open-coded checks of SEL_UPL, etc. to TRAPF_USERMODE() when we only care about whether the frame has stack registers. This fixes 3 places in my recent fix for register variables in vm86 mode where I messed up the PSL_VM check and cleans up other places.
159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 2003 Peter Wemm.
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)frame.h 5.2 (Berkeley) 1/18/91
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_FRAME_H_
|
|
#define _MACHINE_FRAME_H_ 1
|
|
|
|
/*
|
|
* System stack frames.
|
|
*/
|
|
|
|
#ifdef __i386__
|
|
/*
|
|
* Exception/Trap Stack Frame
|
|
*/
|
|
|
|
struct trapframe {
|
|
int tf_fs;
|
|
int tf_es;
|
|
int tf_ds;
|
|
int tf_edi;
|
|
int tf_esi;
|
|
int tf_ebp;
|
|
int tf_isp;
|
|
int tf_ebx;
|
|
int tf_edx;
|
|
int tf_ecx;
|
|
int tf_eax;
|
|
int tf_trapno;
|
|
/* below portion defined in 386 hardware */
|
|
int tf_err;
|
|
int tf_eip;
|
|
int tf_cs;
|
|
int tf_eflags;
|
|
/* below only when crossing rings (user to kernel) */
|
|
int tf_esp;
|
|
int tf_ss;
|
|
};
|
|
|
|
/* Superset of trap frame, for traps from virtual-8086 mode */
|
|
|
|
struct trapframe_vm86 {
|
|
int tf_fs;
|
|
int tf_es;
|
|
int tf_ds;
|
|
int tf_edi;
|
|
int tf_esi;
|
|
int tf_ebp;
|
|
int tf_isp;
|
|
int tf_ebx;
|
|
int tf_edx;
|
|
int tf_ecx;
|
|
int tf_eax;
|
|
int tf_trapno;
|
|
/* below portion defined in 386 hardware */
|
|
int tf_err;
|
|
int tf_eip;
|
|
int tf_cs;
|
|
int tf_eflags;
|
|
/* below only when crossing rings (user (including vm86) to kernel) */
|
|
int tf_esp;
|
|
int tf_ss;
|
|
/* below only when crossing from vm86 mode to kernel */
|
|
int tf_vm86_es;
|
|
int tf_vm86_ds;
|
|
int tf_vm86_fs;
|
|
int tf_vm86_gs;
|
|
};
|
|
#endif /* __i386__ */
|
|
|
|
#ifdef __amd64__
|
|
/*
|
|
* Exception/Trap Stack Frame
|
|
*
|
|
* The ordering of this is specifically so that we can take first 6
|
|
* the syscall arguments directly from the beginning of the frame.
|
|
*/
|
|
|
|
struct trapframe {
|
|
register_t tf_rdi;
|
|
register_t tf_rsi;
|
|
register_t tf_rdx;
|
|
register_t tf_rcx;
|
|
register_t tf_r8;
|
|
register_t tf_r9;
|
|
register_t tf_rax;
|
|
register_t tf_rbx;
|
|
register_t tf_rbp;
|
|
register_t tf_r10;
|
|
register_t tf_r11;
|
|
register_t tf_r12;
|
|
register_t tf_r13;
|
|
register_t tf_r14;
|
|
register_t tf_r15;
|
|
uint32_t tf_trapno;
|
|
uint16_t tf_fs;
|
|
uint16_t tf_gs;
|
|
register_t tf_addr;
|
|
uint32_t tf_flags;
|
|
uint16_t tf_es;
|
|
uint16_t tf_ds;
|
|
/* below portion defined in hardware */
|
|
register_t tf_err;
|
|
register_t tf_rip;
|
|
register_t tf_cs;
|
|
register_t tf_rflags;
|
|
/* below only when crossing rings (user to kernel) */
|
|
register_t tf_rsp;
|
|
register_t tf_ss;
|
|
};
|
|
|
|
#define TF_HASSEGS 0x1
|
|
#define TF_HASBASES 0x2
|
|
#define TF_HASFPXSTATE 0x4
|
|
#endif /* __amd64__ */
|
|
|
|
/*
|
|
* This alias for the MI TRAPF_USERMODE() should be used when we don't
|
|
* care about user mode itself, but need to know if a frame has stack
|
|
* registers. The difference is only logical, but on i386 the logic
|
|
* for using TRAPF_USERMODE() is complicated by sometimes treating vm86
|
|
* bioscall mode (which is a special ring 3 user mode) as kernel mode.
|
|
*/
|
|
#define TF_HAS_STACKREGS(tf) TRAPF_USERMODE(tf)
|
|
|
|
#endif /* _MACHINE_FRAME_H_ */
|