1 /* 2 * Copyright (c) 2001 Wasabi Systems, Inc. 3 * All rights reserved. 4 * 5 * Written by Frank van der Linden for Wasabi Systems, Inc. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project by 18 * Wasabi Systems, Inc. 19 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 20 * or promote products derived from this software without specific prior 21 * written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <private/bionic_asm.h> 37 38 39 // The internal structure of a jmp_buf is totally private. 40 // Current layout (changes from release to release): 41 // 42 // word name description 43 // 0 rbx registers 44 // 1 rbp 45 // 2 r12 46 // 3 r13 47 // 4 r14 48 // 5 r15 49 // 6 rsp 50 // 7 pc 51 // 8 sigflag/cookie setjmp cookie in top 31 bits, signal mask flag in low bit 52 // 9 sigmask signal mask (includes rt signals as well) 53 // 10 checksum checksum of the core registers, to give better error messages. 54 55 #define _JB_RBX 0 56 #define _JB_RBP 1 57 #define _JB_R12 2 58 #define _JB_R13 3 59 #define _JB_R14 4 60 #define _JB_R15 5 61 #define _JB_RSP 6 62 #define _JB_PC 7 63 #define _JB_SIGFLAG 8 64 #define _JB_SIGMASK 9 65 #define _JB_CHECKSUM 10 66 67 #define MANGLE_REGISTERS 1 68 69 .macro m_mangle_registers reg 70 #if MANGLE_REGISTERS 71 xorq \reg,%rbx 72 xorq \reg,%rbp 73 xorq \reg,%r12 74 xorq \reg,%r13 75 xorq \reg,%r14 76 xorq \reg,%r15 77 xorq \reg,%rsp 78 xorq \reg,%r11 79 #endif 80 .endm 81 82 .macro m_unmangle_registers reg 83 m_mangle_registers \reg 84 .endm 85 86 .macro m_calculate_checksum dst, src 87 movq $0, \dst 88 .irp i,0,1,2,3,4,5,6,7 89 xorq (\i*8)(\src), \dst 90 .endr 91 .endm 92 93 ENTRY(setjmp) 94 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(setjmp) 95 movl $1,%esi 96 jmp PIC_PLT(sigsetjmp) 97 END(setjmp) 98 99 ENTRY(_setjmp) 100 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_setjmp) 101 movl $0,%esi 102 jmp PIC_PLT(sigsetjmp) 103 END(_setjmp) 104 105 // int sigsetjmp(sigjmp_buf env, int save_signal_mask); 106 ENTRY(sigsetjmp) 107 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(sigsetjmp) 108 pushq %rdi 109 movq %rsi,%rdi 110 call PIC_PLT(__bionic_setjmp_cookie_get) 111 popq %rdi 112 113 // Record setjmp cookie and whether or not we're saving the signal mask. 114 movq %rax,(_JB_SIGFLAG * 8)(%rdi) 115 pushq %rax 116 117 // Do we need to save the signal mask? 118 testq $1,%rax 119 jz 2f 120 121 // Save current signal mask. 122 pushq %rdi // Push 'env'. 123 // The 'how' argument is ignored if new_mask is NULL. 124 xorq %rsi,%rsi // NULL. 125 leaq (_JB_SIGMASK * 8)(%rdi),%rdx // old_mask. 126 call PIC_PLT(sigprocmask) 127 popq %rdi // Pop 'env'. 128 129 2: 130 // Save the callee-save registers. 131 popq %rax 132 andq $-2,%rax 133 movq (%rsp),%r11 134 m_mangle_registers %rax 135 movq %rbx,(_JB_RBX * 8)(%rdi) 136 movq %rbp,(_JB_RBP * 8)(%rdi) 137 movq %r12,(_JB_R12 * 8)(%rdi) 138 movq %r13,(_JB_R13 * 8)(%rdi) 139 movq %r14,(_JB_R14 * 8)(%rdi) 140 movq %r15,(_JB_R15 * 8)(%rdi) 141 movq %rsp,(_JB_RSP * 8)(%rdi) 142 movq %r11,(_JB_PC * 8)(%rdi) 143 m_unmangle_registers %rax 144 145 m_calculate_checksum %rax, %rdi 146 movq %rax, (_JB_CHECKSUM * 8)(%rdi) 147 148 xorl %eax,%eax 149 ret 150 END(sigsetjmp) 151 152 // void siglongjmp(sigjmp_buf env, int value); 153 ENTRY(siglongjmp) 154 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(siglongjmp) 155 movq %rdi,%r12 156 pushq %rsi // Push 'value'. 157 158 m_calculate_checksum %rax, %rdi 159 xorq (_JB_CHECKSUM * 8)(%rdi), %rax 160 jnz 3f 161 162 // Do we need to restore the signal mask? 163 movq (_JB_SIGFLAG * 8)(%rdi), %rdi 164 pushq %rdi // Push cookie 165 testq $1, %rdi 166 jz 2f 167 168 // Restore the signal mask. 169 movq $2,%rdi // SIG_SETMASK. 170 leaq (_JB_SIGMASK * 8)(%r12),%rsi // new_mask. 171 xorq %rdx,%rdx // NULL. 172 call PIC_PLT(sigprocmask) 173 174 2: 175 // Fetch the setjmp cookie and clear the signal flag bit. 176 popq %rcx 177 andq $-2, %rcx 178 179 popq %rax // Pop 'value'. 180 181 // Restore the callee-save registers. 182 movq (_JB_RBX * 8)(%r12),%rbx 183 movq (_JB_RBP * 8)(%r12),%rbp 184 movq (_JB_R13 * 8)(%r12),%r13 185 movq (_JB_R14 * 8)(%r12),%r14 186 movq (_JB_R15 * 8)(%r12),%r15 187 movq (_JB_RSP * 8)(%r12),%rsp 188 movq (_JB_PC * 8)(%r12),%r11 189 movq (_JB_R12 * 8)(%r12),%r12 190 m_unmangle_registers %rcx 191 192 // Check the cookie. 193 pushq %rax 194 pushq %r11 195 movq %rcx, %rdi 196 call PIC_PLT(__bionic_setjmp_cookie_check) 197 popq %r11 198 popq %rax 199 200 // Return 1 if value is 0. 201 testl %eax,%eax 202 jnz 1f 203 incl %eax 204 1: 205 movq %r11,0(%rsp) 206 ret 207 208 3: 209 call PIC_PLT(__bionic_setjmp_checksum_mismatch) 210 END(siglongjmp) 211 212 ALIAS_SYMBOL(longjmp, siglongjmp) 213 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(longjmp) 214 ALIAS_SYMBOL(_longjmp, siglongjmp) 215 __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(_longjmp) 216
