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141 lines
4.5 KiB
ArmAsm
141 lines
4.5 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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* Copyright (c) 2021 The FreeBSD Foundation
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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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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#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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/*
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* Signal trampoline, mapped as vdso into shared page, or copied to
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* top of user stack for old binaries.
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*/
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ALIGN_TEXT
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.globl __vdso_ia32_sigcode
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__vdso_ia32_sigcode:
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.cfi_startproc
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.cfi_signal_frame
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.cfi_def_cfa %esp, 0
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#if 0
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.cfi_offset %gs, IA32_SIGF_UC + IA32_UC_GS
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.cfi_offset %fs, IA32_SIGF_UC + IA32_UC_FS
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.cfi_offset %es, IA32_SIGF_UC + IA32_UC_ES
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.cfi_offset %ds, IA32_SIGF_UC + IA32_UC_DS
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#endif
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.cfi_offset %edi, IA32_SIGF_UC + IA32_UC_EDI
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.cfi_offset %esi, IA32_SIGF_UC + IA32_UC_ESI
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.cfi_offset %ebp, IA32_SIGF_UC + IA32_UC_EBP
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.cfi_offset %ebx, IA32_SIGF_UC + IA32_UC_EBX
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.cfi_offset %edx, IA32_SIGF_UC + IA32_UC_EDX
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.cfi_offset %ecx, IA32_SIGF_UC + IA32_UC_ECX
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.cfi_offset %eax, IA32_SIGF_UC + IA32_UC_EAX
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.cfi_offset %eip, IA32_SIGF_UC + IA32_UC_EIP
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#if 0
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.cfi_offset %cs, IA32_SIGF_UC + IA32_UC_CS
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.cfi_offset %flags, IA32_SIGF_UC + IA32_UC_EFLAGS
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#endif
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.cfi_offset %esp, IA32_SIGF_UC + IA32_UC_ESP
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#if 0
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.cfi_offset %ss, IA32_SIGF_UC + IA32_UC_SS
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.cfi_offset 93 /* %fs.base */, IA32_SIGF_UC + IA32_UC_FSBASE
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.cfi_offset 94 /* %gs.base */, IA32_SIGF_UC + IA32_UC_GSBASE
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#endif
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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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.cfi_def_cfa %esp, 4
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movl $SYS_sigreturn,%eax
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pushl %eax /* junk to fake return addr. */
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.cfi_def_cfa %esp, 8
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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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.cfi_endproc
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ALIGN_TEXT
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.globl __vdso_freebsd4_ia32_sigcode
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__vdso_freebsd4_ia32_sigcode:
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#ifdef COMPAT_FREEBSD4
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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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#else
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ud2
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#endif
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ALIGN_TEXT
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.globl __vdso_ia32_osigcode
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__vdso_ia32_osigcode:
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#ifdef COMPAT_43
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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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#else
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ud2
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#endif
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/*
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* Our lcall $7,$0 handler remains in user mode (ring 3), since lcalls
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* don't change the interrupt mask, so if this one went directly to the
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* kernel then there would be a window with interrupts enabled in kernel
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* mode, and all interrupt handlers would have to be almost as complicated
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* as the NMI handler to support this.
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*
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* Instead, convert the lcall to an int0x80 call. The kernel does most
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* of the conversion by popping the lcall return values off the user
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* stack and returning to them instead of to here, except when the
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* conversion itself fails. Adjusting the stack here is impossible for
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* vfork() and harder for other syscalls.
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*/
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ALIGN_TEXT
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.globl __vdso_lcall_tramp
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__vdso_lcall_tramp:
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#ifdef COMPAT_43
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int $0x80
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1: jmp 1b
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#else
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ud2
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#endif
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.p2align 1
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