141 lines
3.8 KiB
ArmAsm
141 lines
3.8 KiB
ArmAsm
/*-
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* Copyright (c) 2003 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include <machine/asmacros.h>
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#include <sys/syscall.h>
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#include "ia32_assym.h"
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.text
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.code32
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/*
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* Signal trampoline, copied to top of user stack
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* XXX may need to be MD to match backend sendsig handoff protocol
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*/
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ALIGN_TEXT
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.globl ia32_sigcode
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ia32_sigcode:
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calll *IA32_SIGF_HANDLER(%esp)
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leal IA32_SIGF_UC(%esp),%eax /* get ucontext */
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pushl %eax
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movl $SYS_sigreturn,%eax
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pushl %eax /* junk to fake return addr. */
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int $0x80 /* enter kernel with args */
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/* on stack */
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1:
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jmp 1b
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#ifdef COMPAT_FREEBSD4
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ALIGN_TEXT
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freebsd4_ia32_sigcode:
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calll *IA32_SIGF_HANDLER(%esp)
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leal IA32_SIGF_UC4(%esp),%eax/* get ucontext */
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pushl %eax
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movl $344,%eax /* 4.x SYS_sigreturn */
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pushl %eax /* junk to fake return addr. */
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int $0x80 /* enter kernel with args */
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/* on stack */
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1:
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jmp 1b
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#endif
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#ifdef COMPAT_43
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ALIGN_TEXT
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ia32_osigcode:
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calll *IA32_SIGF_HANDLER(%esp)/* call signal handler */
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leal IA32_SIGF_SC(%esp),%eax /* get sigcontext */
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pushl %eax
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movl $103,%eax /* 3.x SYS_sigreturn */
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pushl %eax /* junk to fake return addr. */
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int $0x80 /* enter kernel with args */
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1:
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jmp 1b
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/*
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* The lcall $7,$0 emulator cannot use the call gate that does an
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* inter-privilege transition. The reason is that the call gate
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* does not disable interrupts, and, before the swapgs is
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* executed, we would have a window where the ring 0 code is
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* executed with the wrong gsbase.
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*
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* Instead, set LDT descriptor 0 as code segment, which reflects
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* the lcall $7,$0 back to ring 3 trampoline. The trampoline sets up
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* the frame for int $0x80.
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*/
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ALIGN_TEXT
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lcall_tramp:
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cmpl $SYS_vfork,%eax
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je 1f
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pushl %ebp
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movl %esp,%ebp
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pushl 0x24(%ebp) /* arg 6 */
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pushl 0x20(%ebp)
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pushl 0x1c(%ebp)
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pushl 0x18(%ebp)
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pushl 0x14(%ebp)
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pushl 0x10(%ebp) /* arg 1 */
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subl $4,%esp /* gap */
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int $0x80
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leavel
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lretl
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1:
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/*
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* vfork handling is special and relies on the libc stub saving
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* the return ip in %ecx. Also, we assume that the call was done
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* with ucode32 selector in %cs.
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*/
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int $0x80
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movl $0x33,4(%esp) /* GUCODE32_SEL | SEL_UPL */
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movl %ecx,(%esp)
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lretl
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#endif
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ALIGN_TEXT
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esigcode:
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.data
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.globl sz_ia32_sigcode
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sz_ia32_sigcode:
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.long esigcode-ia32_sigcode
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#ifdef COMPAT_FREEBSD4
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.globl sz_freebsd4_ia32_sigcode
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sz_freebsd4_ia32_sigcode:
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.long esigcode-freebsd4_ia32_sigcode
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#endif
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#ifdef COMPAT_43
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.globl sz_ia32_osigcode
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sz_ia32_osigcode:
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.long esigcode-ia32_osigcode
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.globl sz_lcall_tramp
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sz_lcall_tramp:
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.long esigcode-lcall_tramp
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#endif
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