diff options
Diffstat (limited to 'lib/libc/amd64/gen/setjmp.S')
-rw-r--r-- | lib/libc/amd64/gen/setjmp.S | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/libc/amd64/gen/setjmp.S b/lib/libc/amd64/gen/setjmp.S new file mode 100644 index 0000000..47772be --- /dev/null +++ b/lib/libc/amd64/gen/setjmp.S @@ -0,0 +1,117 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) + .asciz "@(#)setjmp.s 5.1 (Berkeley) 4/23/90" +#endif /* LIBC_SCCS and not lint */ +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +/* + * C library -- _setjmp, _longjmp + * + * longjmp(a,v) + * will generate a "return(v)" from the last call to + * setjmp(a) + * by restoring registers from the environment 'a'. + * The previous signal state is restored. + */ + +#include "SYS.h" + +ENTRY(setjmp) + pushq %rdi + movq %rdi,%rcx + movq $1,%rdi /* SIG_BLOCK */ + movq $0,%rsi /* (sigset_t*)set */ + leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */ + /* stack is 16-byte aligned */ + call PIC_PLT(CNAME(_sigprocmask)) + popq %rdi + movq %rdi,%rcx + movq 0(%rsp),%rdx /* retval */ + movq %rdx, 0(%rcx) /* 0; retval */ + movq %rbx, 8(%rcx) /* 1; rbx */ + movq %rsp,16(%rcx) /* 2; rsp */ + movq %rbp,24(%rcx) /* 3; rbp */ + movq %r12,32(%rcx) /* 4; r12 */ + movq %r13,40(%rcx) /* 5; r13 */ + movq %r14,48(%rcx) /* 6; r14 */ + movq %r15,56(%rcx) /* 7; r15 */ + fnstcw 64(%rcx) /* 8; fpu cw */ + stmxcsr 68(%rcx) /* and mxcsr */ + xorq %rax,%rax + ret +END(setjmp) + + .weak CNAME(longjmp) + .set CNAME(longjmp),CNAME(__longjmp) +ENTRY(__longjmp) + pushq %rdi + pushq %rsi + movq %rdi,%rdx + movq $3,%rdi /* SIG_SETMASK */ + leaq 72(%rdx),%rsi /* (sigset_t*)set */ + movq $0,%rdx /* (sigset_t*)oset */ + subq $0x8,%rsp /* make the stack 16-byte aligned */ + call PIC_PLT(CNAME(_sigprocmask)) + addq $0x8,%rsp + popq %rsi + popq %rdi /* jmpbuf */ + movq %rdi,%rdx + /* Restore the mxcsr, but leave exception flags intact. */ + stmxcsr -4(%rsp) + movl 68(%rdx),%eax + andl $0xffffffc0,%eax + movl -4(%rsp),%edi + andl $0x3f,%edi + xorl %eax,%edi + movl %edi,-4(%rsp) + ldmxcsr -4(%rsp) + movq %rsi,%rax /* retval */ + movq 0(%rdx),%rcx + movq 8(%rdx),%rbx + movq 16(%rdx),%rsp + movq 24(%rdx),%rbp + movq 32(%rdx),%r12 + movq 40(%rdx),%r13 + movq 48(%rdx),%r14 + movq 56(%rdx),%r15 + fldcw 64(%rdx) + testq %rax,%rax + jnz 1f + incq %rax +1: movq %rcx,0(%rsp) + ret +END(__longjmp) + + .section .note.GNU-stack,"",%progbits |