/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <private/bionic_asm.h>
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// The internal structure of a jmp_buf is totally private.
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// Current layout (changes from release to release):
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//
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// word name description
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// 0 rbx registers
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// 1 rbp
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// 2 r12
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// 3 r13
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// 4 r14
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// 5 r15
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// 6 rsp
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// 7 pc
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// 8 sigflag/cookie setjmp cookie in top 31 bits, signal mask flag in low bit
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// 9 sigmask signal mask (includes rt signals as well)
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// 10 checksum checksum of the core registers, to give better error messages.
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#define _JB_RBX 0
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#define _JB_RBP 1
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#define _JB_R12 2
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#define _JB_R13 3
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#define _JB_R14 4
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#define _JB_R15 5
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#define _JB_RSP 6
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#define _JB_PC 7
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#define _JB_SIGFLAG 8
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#define _JB_SIGMASK 9
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#define _JB_CHECKSUM 10
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#define MANGLE_REGISTERS 1
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.macro m_mangle_registers reg
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#if MANGLE_REGISTERS
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xorq \reg,%rbx
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xorq \reg,%rbp
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xorq \reg,%r12
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xorq \reg,%r13
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xorq \reg,%r14
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xorq \reg,%r15
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xorq \reg,%rsp
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xorq \reg,%r11
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#endif
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.endm
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.macro m_unmangle_registers reg
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m_mangle_registers \reg
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.endm
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.macro m_calculate_checksum dst, src
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movq $0, \dst
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.irp i,0,1,2,3,4,5,6,7
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xorq (\i*8)(\src), \dst
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.endr
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.endm
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ENTRY(setjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(setjmp)
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movl $1,%esi
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jmp PIC_PLT(sigsetjmp)
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END(setjmp)
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ENTRY(_setjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_setjmp)
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movl $0,%esi
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jmp PIC_PLT(sigsetjmp)
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END(_setjmp)
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// int sigsetjmp(sigjmp_buf env, int save_signal_mask);
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ENTRY(sigsetjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(sigsetjmp)
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pushq %rdi
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movq %rsi,%rdi
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call PIC_PLT(__bionic_setjmp_cookie_get)
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popq %rdi
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// Record setjmp cookie and whether or not we're saving the signal mask.
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movq %rax,(_JB_SIGFLAG * 8)(%rdi)
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pushq %rax
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// Do we need to save the signal mask?
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testq $1,%rax
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jz 2f
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// Save current signal mask.
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pushq %rdi // Push 'env'.
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// The 'how' argument is ignored if new_mask is NULL.
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xorq %rsi,%rsi // NULL.
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leaq (_JB_SIGMASK * 8)(%rdi),%rdx // old_mask.
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call PIC_PLT(sigprocmask)
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popq %rdi // Pop 'env'.
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2:
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// Save the callee-save registers.
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popq %rax
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andq $-2,%rax
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movq (%rsp),%r11
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m_mangle_registers %rax
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movq %rbx,(_JB_RBX * 8)(%rdi)
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movq %rbp,(_JB_RBP * 8)(%rdi)
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movq %r12,(_JB_R12 * 8)(%rdi)
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movq %r13,(_JB_R13 * 8)(%rdi)
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movq %r14,(_JB_R14 * 8)(%rdi)
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movq %r15,(_JB_R15 * 8)(%rdi)
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movq %rsp,(_JB_RSP * 8)(%rdi)
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movq %r11,(_JB_PC * 8)(%rdi)
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m_unmangle_registers %rax
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m_calculate_checksum %rax, %rdi
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movq %rax, (_JB_CHECKSUM * 8)(%rdi)
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xorl %eax,%eax
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ret
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END(sigsetjmp)
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// void siglongjmp(sigjmp_buf env, int value);
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ENTRY(siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(siglongjmp)
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movq %rdi,%r12
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pushq %rsi // Push 'value'.
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m_calculate_checksum %rax, %rdi
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xorq (_JB_CHECKSUM * 8)(%rdi), %rax
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jnz 3f
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// Do we need to restore the signal mask?
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movq (_JB_SIGFLAG * 8)(%rdi), %rdi
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pushq %rdi // Push cookie
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testq $1, %rdi
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jz 2f
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// Restore the signal mask.
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movq $2,%rdi // SIG_SETMASK.
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leaq (_JB_SIGMASK * 8)(%r12),%rsi // new_mask.
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xorq %rdx,%rdx // NULL.
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call PIC_PLT(sigprocmask)
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2:
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// Fetch the setjmp cookie and clear the signal flag bit.
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popq %rcx
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andq $-2, %rcx
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popq %rax // Pop 'value'.
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// Restore the callee-save registers.
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movq (_JB_RBX * 8)(%r12),%rbx
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movq (_JB_RBP * 8)(%r12),%rbp
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movq (_JB_R13 * 8)(%r12),%r13
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movq (_JB_R14 * 8)(%r12),%r14
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movq (_JB_R15 * 8)(%r12),%r15
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movq (_JB_RSP * 8)(%r12),%rsp
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movq (_JB_PC * 8)(%r12),%r11
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movq (_JB_R12 * 8)(%r12),%r12
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m_unmangle_registers %rcx
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// Check the cookie.
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pushq %rax
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pushq %r11
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movq %rcx, %rdi
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call PIC_PLT(__bionic_setjmp_cookie_check)
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popq %r11
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popq %rax
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// Return 1 if value is 0.
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testl %eax,%eax
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jnz 1f
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incl %eax
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1:
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movq %r11,0(%rsp)
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ret
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3:
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call PIC_PLT(__bionic_setjmp_checksum_mismatch)
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END(siglongjmp)
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ALIAS_SYMBOL(longjmp, siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(longjmp)
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ALIAS_SYMBOL(_longjmp, siglongjmp)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_longjmp)
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