/*--------------------------------------------------------------------*/ /*--- A minimal setjmp/longjmp implementation. m_libcsetjmp.c ---*/ /*--------------------------------------------------------------------*/ /* This file is part of Valgrind, a dynamic binary instrumentation framework. Copyright (C) 2010-2017 Mozilla Inc This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. The GNU General Public License is contained in the file COPYING. */ /* Contributed by Julian Seward */ #include "pub_core_basics.h" #include "pub_core_libcsetjmp.h" /* self */ /* See include/pub_tool_libcsetjmp.h for background and rationale. */ /* The alternative implementations are for ppc{32,64}-linux and {amd64,x86}-{linux,darwin,solaris}. See #259977. That leaves only {arm,s390x}-linux using the gcc builtins now. */ /* ------------ ppc32-linux ------------ */ #if defined(VGP_ppc32_linux) __asm__( ".text" "\n" "" "\n" ".global VG_MINIMAL_SETJMP" "\n" // r3 = jmp_buf "VG_MINIMAL_SETJMP:" "\n" " stw 0, 0(3)" "\n" " stw 1, 4(3)" "\n" " stw 2, 8(3)" "\n" " stw 3, 12(3)" "\n" " stw 4, 16(3)" "\n" " stw 5, 20(3)" "\n" " stw 6, 24(3)" "\n" " stw 7, 28(3)" "\n" " stw 8, 32(3)" "\n" " stw 9, 36(3)" "\n" " stw 10, 40(3)" "\n" " stw 11, 44(3)" "\n" " stw 12, 48(3)" "\n" " stw 13, 52(3)" "\n" " stw 14, 56(3)" "\n" " stw 15, 60(3)" "\n" " stw 16, 64(3)" "\n" " stw 17, 68(3)" "\n" " stw 18, 72(3)" "\n" " stw 19, 76(3)" "\n" " stw 20, 80(3)" "\n" " stw 21, 84(3)" "\n" " stw 22, 88(3)" "\n" " stw 23, 92(3)" "\n" " stw 24, 96(3)" "\n" " stw 25, 100(3)" "\n" " stw 26, 104(3)" "\n" " stw 27, 108(3)" "\n" " stw 28, 112(3)" "\n" " stw 29, 116(3)" "\n" " stw 30, 120(3)" "\n" " stw 31, 124(3)" "\n" // must use a caller-save register here as scratch, hence r4 " mflr 4" "\n" " stw 4, 128(3)" "\n" " mfcr 4" "\n" " stw 4, 132(3)" "\n" " li 3, 0" "\n" " blr" "\n" "" "\n" ".global VG_MINIMAL_LONGJMP" "\n" "VG_MINIMAL_LONGJMP:" "\n" // r3 = jmp_buf // do r4 = 1 // and park it in the restore slot for r3 (the ret reg) " li 4, 1" "\n" " stw 4, 12(3)" "\n" // restore everything except r3 // then r3 last of all // then blr " lwz 0, 128(3)" "\n" " mtlr 0" "\n" " lwz 0, 132(3)" "\n" " mtcr 0" "\n" " lwz 0, 0(3)" "\n" " lwz 1, 4(3)" "\n" " lwz 2, 8(3)" "\n" // r3 is done at the end " lwz 4, 16(3)" "\n" " lwz 5, 20(3)" "\n" " lwz 6, 24(3)" "\n" " lwz 7, 28(3)" "\n" " lwz 8, 32(3)" "\n" " lwz 9, 36(3)" "\n" " lwz 10, 40(3)" "\n" " lwz 11, 44(3)" "\n" " lwz 12, 48(3)" "\n" " lwz 13, 52(3)" "\n" " lwz 14, 56(3)" "\n" " lwz 15, 60(3)" "\n" " lwz 16, 64(3)" "\n" " lwz 17, 68(3)" "\n" " lwz 18, 72(3)" "\n" " lwz 19, 76(3)" "\n" " lwz 20, 80(3)" "\n" " lwz 21, 84(3)" "\n" " lwz 22, 88(3)" "\n" " lwz 23, 92(3)" "\n" " lwz 24, 96(3)" "\n" " lwz 25, 100(3)" "\n" " lwz 26, 104(3)" "\n" " lwz 27, 108(3)" "\n" " lwz 28, 112(3)" "\n" " lwz 29, 116(3)" "\n" " lwz 30, 120(3)" "\n" " lwz 31, 124(3)" "\n" " lwz 3, 12(3)" "\n" " blr" "\n" "" "\n" ".previous" "\n" ); #endif /* VGP_ppc32_linux */ /* ------------ ppc64-linux ------------ */ #if defined(VGP_ppc64be_linux) __asm__( ".section \".toc\",\"aw\"" "\n" ".section \".text\"" "\n" ".align 2" "\n" ".p2align 4,,15" "\n" ".globl VG_MINIMAL_SETJMP" "\n" ".section \".opd\",\"aw\"" "\n" ".align 3" "\n" "VG_MINIMAL_SETJMP:" "\n" ".quad .L.VG_MINIMAL_SETJMP,.TOC.@tocbase,0" "\n" ".previous" "\n" ".type VG_MINIMAL_SETJMP, @function" "\n" ".L.VG_MINIMAL_SETJMP:" "\n" " std 0, 0(3)" "\n" " std 1, 8(3)" "\n" " std 2, 16(3)" "\n" " std 3, 24(3)" "\n" " std 4, 32(3)" "\n" " std 5, 40(3)" "\n" " std 6, 48(3)" "\n" " std 7, 56(3)" "\n" " std 8, 64(3)" "\n" " std 9, 72(3)" "\n" " std 10, 80(3)" "\n" " std 11, 88(3)" "\n" " std 12, 96(3)" "\n" " std 13, 104(3)" "\n" " std 14, 112(3)" "\n" " std 15, 120(3)" "\n" " std 16, 128(3)" "\n" " std 17, 136(3)" "\n" " std 18, 144(3)" "\n" " std 19, 152(3)" "\n" " std 20, 160(3)" "\n" " std 21, 168(3)" "\n" " std 22, 176(3)" "\n" " std 23, 184(3)" "\n" " std 24, 192(3)" "\n" " std 25, 200(3)" "\n" " std 26, 208(3)" "\n" " std 27, 216(3)" "\n" " std 28, 224(3)" "\n" " std 29, 232(3)" "\n" " std 30, 240(3)" "\n" " std 31, 248(3)" "\n" // must use a caller-save register here as scratch, hence r4 " mflr 4" "\n" " std 4, 256(3)" "\n" " mfcr 4" "\n" " std 4, 264(3)" "\n" " li 3, 0" "\n" " blr" "\n" "" "\n" ".globl VG_MINIMAL_LONGJMP" "\n" ".section \".opd\",\"aw\"" "\n" ".align 3" "\n" "VG_MINIMAL_LONGJMP:" "\n" ".quad .L.VG_MINIMAL_LONGJMP,.TOC.@tocbase,0" "\n" ".previous" "\n" ".type VG_MINIMAL_LONGJMP, @function" "\n" ".L.VG_MINIMAL_LONGJMP:" "\n" // do r4 = 1 // and park it in the restore slot for r3 (the ret reg) " li 4, 1" "\n" " std 4, 24(3)" "\n" // restore everything except r3 // then r3 last of all // then blr " ld 0, 256(3)" "\n" " mtlr 0" "\n" " ld 0, 264(3)" "\n" " mtcr 0" "\n" " ld 0, 0(3)" "\n" " ld 1, 8(3)" "\n" " ld 2, 16(3)" "\n" // r3 is done at the end " ld 4, 32(3)" "\n" " ld 5, 40(3)" "\n" " ld 6, 48(3)" "\n" " ld 7, 56(3)" "\n" " ld 8, 64(3)" "\n" " ld 9, 72(3)" "\n" " ld 10, 80(3)" "\n" " ld 11, 88(3)" "\n" " ld 12, 96(3)" "\n" " ld 13, 104(3)" "\n" " ld 14, 112(3)" "\n" " ld 15, 120(3)" "\n" " ld 16, 128(3)" "\n" " ld 17, 136(3)" "\n" " ld 18, 144(3)" "\n" " ld 19, 152(3)" "\n" " ld 20, 160(3)" "\n" " ld 21, 168(3)" "\n" " ld 22, 176(3)" "\n" " ld 23, 184(3)" "\n" " ld 24, 192(3)" "\n" " ld 25, 200(3)" "\n" " ld 26, 208(3)" "\n" " ld 27, 216(3)" "\n" " ld 28, 224(3)" "\n" " ld 29, 232(3)" "\n" " ld 30, 240(3)" "\n" " ld 31, 248(3)" "\n" " ld 3, 24(3)" "\n" " blr" "\n" "" "\n" ".previous" "\n" ); #elif defined(VGP_ppc64le_linux) __asm__( ".section \".toc\",\"aw\"" "\n" ".section \".text\"" "\n" ".align 2" "\n" ".p2align 4,,15" "\n" ".globl VG_MINIMAL_SETJMP" "\n" ".type VG_MINIMAL_SETJMP,@function" "\n" "VG_MINIMAL_SETJMP:" "\n" " .localentry VG_MINIMAL_SETJMP, .-VG_MINIMAL_SETJMP" "\n" " std 0, 0(3)" "\n" " std 1, 8(3)" "\n" " std 2, 16(3)" "\n" " std 3, 24(3)" "\n" " std 4, 32(3)" "\n" " std 5, 40(3)" "\n" " std 6, 48(3)" "\n" " std 7, 56(3)" "\n" " std 8, 64(3)" "\n" " std 9, 72(3)" "\n" " std 10, 80(3)" "\n" " std 11, 88(3)" "\n" " std 12, 96(3)" "\n" " std 13, 104(3)" "\n" " std 14, 112(3)" "\n" " std 15, 120(3)" "\n" " std 16, 128(3)" "\n" " std 17, 136(3)" "\n" " std 18, 144(3)" "\n" " std 19, 152(3)" "\n" " std 20, 160(3)" "\n" " std 21, 168(3)" "\n" " std 22, 176(3)" "\n" " std 23, 184(3)" "\n" " std 24, 192(3)" "\n" " std 25, 200(3)" "\n" " std 26, 208(3)" "\n" " std 27, 216(3)" "\n" " std 28, 224(3)" "\n" " std 29, 232(3)" "\n" " std 30, 240(3)" "\n" " std 31, 248(3)" "\n" // must use a caller-save register here as scratch, hence r4 " mflr 4" "\n" " std 4, 256(3)" "\n" " mfcr 4" "\n" " std 4, 264(3)" "\n" " li 3, 0" "\n" " blr" "\n" "" "\n" ".globl VG_MINIMAL_LONGJMP" "\n" ".type VG_MINIMAL_LONGJMP, @function" "\n" "VG_MINIMAL_LONGJMP:" "\n" " .localentry VG_MINIMAL_LONGJMP, .-VG_MINIMAL_LONGJMP" "\n" // do r4 = 1 // and park it in the restore slot for r3 (the ret reg) " li 4, 1" "\n" " std 4, 24(3)" "\n" // restore everything except r3 // then r3 last of all // then blr " ld 0, 256(3)" "\n" " mtlr 0" "\n" " ld 0, 264(3)" "\n" " mtcr 0" "\n" " ld 0, 0(3)" "\n" " ld 1, 8(3)" "\n" " ld 2, 16(3)" "\n" // r3 is done at the end " ld 4, 32(3)" "\n" " ld 5, 40(3)" "\n" " ld 6, 48(3)" "\n" " ld 7, 56(3)" "\n" " ld 8, 64(3)" "\n" " ld 9, 72(3)" "\n" " ld 10, 80(3)" "\n" " ld 11, 88(3)" "\n" " ld 12, 96(3)" "\n" " ld 13, 104(3)" "\n" " ld 14, 112(3)" "\n" " ld 15, 120(3)" "\n" " ld 16, 128(3)" "\n" " ld 17, 136(3)" "\n" " ld 18, 144(3)" "\n" " ld 19, 152(3)" "\n" " ld 20, 160(3)" "\n" " ld 21, 168(3)" "\n" " ld 22, 176(3)" "\n" " ld 23, 184(3)" "\n" " ld 24, 192(3)" "\n" " ld 25, 200(3)" "\n" " ld 26, 208(3)" "\n" " ld 27, 216(3)" "\n" " ld 28, 224(3)" "\n" " ld 29, 232(3)" "\n" " ld 30, 240(3)" "\n" " ld 31, 248(3)" "\n" " ld 3, 24(3)" "\n" " blr" "\n" "" "\n" ".previous" "\n" ); #endif /* VGP_ppc64be_linux */ /* -------- amd64-{linux,darwin,solaris} -------- */ #if defined(VGP_amd64_linux) || defined(VGP_amd64_darwin) || \ defined(VGP_amd64_solaris) __asm__( ".text" "\n" "" "\n" #if defined(VGP_amd64_linux) || defined(VGP_amd64_solaris) ".global VG_MINIMAL_SETJMP" "\n" // rdi = jmp_buf "VG_MINIMAL_SETJMP:" "\n" #elif defined(VGP_amd64_darwin) ".globl _VG_MINIMAL_SETJMP" "\n" // rdi = jmp_buf "_VG_MINIMAL_SETJMP:" "\n" #else # error "Huh?" #endif " movq %rax, 0(%rdi)" "\n" " movq %rbx, 8(%rdi)" "\n" " movq %rcx, 16(%rdi)" "\n" " movq %rdx, 24(%rdi)" "\n" " movq %rdi, 32(%rdi)" "\n" " movq %rsi, 40(%rdi)" "\n" " movq %rbp, 48(%rdi)" "\n" " movq %rsp, 56(%rdi)" "\n" " movq %r8, 64(%rdi)" "\n" " movq %r9, 72(%rdi)" "\n" " movq %r10, 80(%rdi)" "\n" " movq %r11, 88(%rdi)" "\n" " movq %r12, 96(%rdi)" "\n" " movq %r13, 104(%rdi)" "\n" " movq %r14, 112(%rdi)" "\n" " movq %r15, 120(%rdi)" "\n" // store the return address " movq 0(%rsp), %rax" "\n" " movq %rax, 128(%rdi)" "\n" // and return zero " movq $0, %rax" "\n" " ret" "\n" "" "\n" #if defined(VGP_amd64_linux) || defined(VGP_amd64_solaris) ".global VG_MINIMAL_LONGJMP" "\n" "VG_MINIMAL_LONGJMP:" "\n" // rdi = jmp_buf #elif defined(VGP_amd64_darwin) ".globl _VG_MINIMAL_LONGJMP" "\n" "_VG_MINIMAL_LONGJMP:" "\n" // rdi = jmp_buf #else # error "Huh?" #endif // skip restoring rax; it's pointless " movq 8(%rdi), %rbx" "\n" " movq 16(%rdi), %rcx" "\n" " movq 24(%rdi), %rdx" "\n" // defer restoring rdi; we still need it " movq 40(%rdi), %rsi" "\n" " movq 48(%rdi), %rbp" "\n" " movq 56(%rdi), %rsp" "\n" " movq 64(%rdi), %r8" "\n" " movq 72(%rdi), %r9" "\n" " movq 80(%rdi), %r10" "\n" " movq 88(%rdi), %r11" "\n" " movq 96(%rdi), %r12" "\n" " movq 104(%rdi), %r13" "\n" " movq 112(%rdi), %r14" "\n" " movq 120(%rdi), %r15" "\n" // restore the return address " movq 128(%rdi), %rax" "\n" // restore rdi; this is the last use " movq 32(%rdi), %rdi" "\n" // make %rsp look like we really did a return " addq $8, %rsp" "\n" // continue at RA of original call. Note: this is a // nasty trick. We assume that %rax is nonzero, and so the // caller can differentiate this case from the normal _SETJMP // return case. If the return address ever is zero, then // we're hosed; but that seems pretty unlikely given that it // would mean we'd be executing at the wraparound point of the // address space. " jmp *%rax" "\n" "" "\n" #if !defined(VGP_amd64_darwin) ".previous" "\n" #endif ); #endif /* VGP_amd64_linux || VGP_amd64_darwin || VGP_amd64_solaris */ /* -------- x86-{linux,darwin,solaris} -------- */ #if defined(VGP_x86_linux) || defined(VGP_x86_darwin) || \ defined(VGP_x86_solaris) __asm__( ".text" "\n" "" "\n" #if defined(VGP_x86_linux) || defined(VGP_x86_solaris) ".global VG_MINIMAL_SETJMP" "\n" // eax = jmp_buf "VG_MINIMAL_SETJMP:" "\n" #elif defined(VGP_x86_darwin) ".globl _VG_MINIMAL_SETJMP" "\n" // eax = jmp_buf "_VG_MINIMAL_SETJMP:" "\n" #else # error "Huh?" #endif " movl %eax, 0(%eax)" "\n" " movl %ebx, 4(%eax)" "\n" " movl %ecx, 8(%eax)" "\n" " movl %edx, 12(%eax)" "\n" " movl %edi, 16(%eax)" "\n" " movl %esi, 20(%eax)" "\n" " movl %ebp, 24(%eax)" "\n" " movl %esp, 28(%eax)" "\n" // store the return address " movl 0(%esp), %ebx" "\n" " movl %ebx, 32(%eax)" "\n" // un-trash ebx (necessary? i don't know) " movl 4(%eax), %ebx" "\n" // and return zero " movl $0, %eax" "\n" " ret" "\n" "" "\n" #if defined(VGP_x86_linux) || defined(VGP_x86_solaris) ".global VG_MINIMAL_LONGJMP" "\n" "VG_MINIMAL_LONGJMP:" "\n" // eax = jmp_buf #elif defined(VGP_x86_darwin) ".globl _VG_MINIMAL_LONGJMP" "\n" "_VG_MINIMAL_LONGJMP:" "\n" // eax = jmp_buf #else # error "Huh?" #endif // skip restoring eax; it's pointless " movl 4(%eax), %ebx" "\n" " movl 8(%eax), %ecx" "\n" " movl 12(%eax), %edx" "\n" " movl 16(%eax), %edi" "\n" " movl 20(%eax), %esi" "\n" " movl 24(%eax), %ebp" "\n" " movl 28(%eax), %esp" "\n" // restore the return address " movl 32(%eax), %eax" "\n" // make %esp look like we really did a return " addl $4, %esp" "\n" // continue at RA of original call. Same zero-vs-nonzero // trick/assumption as documented for the amd64-linux case. " jmp *%eax" "\n" "" "\n" #if !defined(VGP_x86_darwin) ".previous" "\n" #endif ); #endif /* VGP_x86_linux || VGP_x86_darwin || VGP_x86_solaris */ #if defined(VGP_mips32_linux) __asm__( ".text \n\t" ".globl VG_MINIMAL_SETJMP; \n\t" ".set push \n\t" ".set noreorder \n\t" "VG_MINIMAL_SETJMP: \n\t" #if defined(__mips_hard_float) " sdc1 $f20, 56($a0) \n\t" " sdc1 $f22, 64($a0) \n\t" " sdc1 $f24, 72($a0) \n\t" " sdc1 $f26, 80($a0) \n\t" " sdc1 $f28, 88($a0) \n\t" " sdc1 $f30, 96($a0) \n\t" #endif " sw $gp, 44($a0) \n\t" " sw $s0, 8($a0) \n\t" " sw $s1, 12($a0) \n\t" " sw $s2, 16($a0) \n\t" " sw $s3, 20($a0) \n\t" " sw $s4, 24($a0) \n\t" " sw $s5, 28($a0) \n\t" " sw $s6, 32($a0) \n\t" " sw $s7, 36($a0) \n\t" " sw $ra, 0($a0) \n\t" " sw $sp, 4($a0) \n\t" " sw $fp, 40($a0) \n\t" " jr $ra \n\t" " move $v0, $zero \n\t" ".set pop \n\t" ".previous \n\t" " \n\t" ".text \n\t" ".globl VG_MINIMAL_LONGJMP; \n\t" ".set push \n\t" ".set noreorder \n\t" "VG_MINIMAL_LONGJMP: \n\t" #if defined(__mips_hard_float) " ldc1 $f20, 56($a0) \n\t" " ldc1 $f22, 64($a0) \n\t" " ldc1 $f24, 72($a0) \n\t" " ldc1 $f26, 80($a0) \n\t" " ldc1 $f28, 88($a0) \n\t" " ldc1 $f30, 96($a0) \n\t" #endif " lw $gp, 44($a0) \n\t" " lw $s0, 8($a0) \n\t" " lw $s1, 12($a0) \n\t" " lw $s2, 16($a0) \n\t" " lw $s3, 20($a0) \n\t" " lw $s4, 24($a0) \n\t" " lw $s5, 28($a0) \n\t" " lw $s6, 32($a0) \n\t" " lw $s7, 36($a0) \n\t" " lw $ra, 0($a0) \n\t" " lw $sp, 4($a0) \n\t" " bnez $a1, 1f \n\t" " lw $fp, 40($a0) \n\t" " addiu $a1, $a1, 1 \n\t" "1: \n\t" " jr $ra \n\t" " move $v0, $a1 \n\t" ".set pop \n\t" ".previous \n\t" ); #endif /* VGP_mips32_linux */ #if defined(VGP_mips64_linux) __asm__( ".text \n\t" ".globl VG_MINIMAL_SETJMP; \n\t" ".set push \n\t" ".set noreorder \n\t" "VG_MINIMAL_SETJMP: \n\t" #if defined(__mips_hard_float) " sdc1 $f24, 104($a0) \n\t" " sdc1 $f25, 112($a0) \n\t" " sdc1 $f26, 120($a0) \n\t" " sdc1 $f27, 128($a0) \n\t" " sdc1 $f28, 136($a0) \n\t" " sdc1 $f29, 144($a0) \n\t" " sdc1 $f30, 152($a0) \n\t" " sdc1 $f31, 160($a0) \n\t" #endif " sd $gp, 88($a0) \n\t" " sd $s0, 16($a0) \n\t" " sd $s1, 24($a0) \n\t" " sd $s2, 32($a0) \n\t" " sd $s3, 40($a0) \n\t" " sd $s4, 48($a0) \n\t" " sd $s5, 56($a0) \n\t" " sd $s6, 64($a0) \n\t" " sd $s7, 72($a0) \n\t" " sd $ra, 0($a0) \n\t" " sd $sp, 8($a0) \n\t" " sd $fp, 80($a0) \n\t" " jr $ra \n\t" " move $v0, $zero \n\t" ".set pop \n\t" ".previous \n\t" " \n\t" ".text \n\t" ".globl VG_MINIMAL_LONGJMP; \n\t" ".set push \n\t" ".set noreorder \n\t" "VG_MINIMAL_LONGJMP: \n\t" #if defined(__mips_hard_float) " ldc1 $f24, 104($a0) \n\t" " ldc1 $f25, 112($a0) \n\t" " ldc1 $f26, 120($a0) \n\t" " ldc1 $f27, 128($a0) \n\t" " ldc1 $f28, 136($a0) \n\t" " ldc1 $f29, 144($a0) \n\t" " ldc1 $f30, 152($a0) \n\t" " ldc1 $f31, 160($a0) \n\t" #endif " ld $gp, 88($a0) \n\t" " ld $s0, 16($a0) \n\t" " ld $s1, 24($a0) \n\t" " ld $s2, 32($a0) \n\t" " ld $s3, 40($a0) \n\t" " ld $s4, 48($a0) \n\t" " ld $s5, 56($a0) \n\t" " ld $s6, 64($a0) \n\t" " ld $s7, 72($a0) \n\t" " ld $ra, 0($a0) \n\t" " ld $sp, 8($a0) \n\t" " bnez $a1, 1f \n\t" " ld $fp, 80($a0) \n\t" " daddiu $a1, $a1, 1 \n\t" "1: \n\t" " jr $ra \n\t" " move $v0, $a1 \n\t" ".set pop \n\t" ".previous \n\t" ); #endif /* VGP_mips64_linux */ /*--------------------------------------------------------------------*/ /*--- end ---*/ /*--------------------------------------------------------------------*/