// Context routines for Linux // vx32_getcontext(struct mcontext_t *ss);  // see /usr/include/sys/ucontext.h for layout.// notice that we don't set the floating-point state.// notice also that unlike the linux getcontext,// we *do* copy the segment registers #ifdef i386 .globl vx32_getcontextvx32_getcontext:	movl 4(%esp), %eax		movl %ecx, 40(%eax)	movl $0, %ecx	movw %gs, %cx	movl %ecx, 0(%eax)	movw %fs, %cx	movl %ecx, 4(%eax)	movw %es, %cx	movl %ecx, 8(%eax)	movw %ds, %cx	movl %ecx, 12(%eax)	movl %edi, 16(%eax)	movl %esi, 20(%eax)	movl %ebp, 24(%eax)	/* 28(%eax) is esp */	movl %ebx, 32(%eax)	movl %edx, 36(%eax)	/* 40(%eax) is ecx, saved above */	movl $1, 44(%eax)	/* eax */	movl $0, 48(%eax)	/* trapno */	movl $0, 52(%eax)	/* err */	/* 56(%eax) is eip */	movw %cs, %cx	movl %ecx, 60(%eax)	pushf	movl 0(%esp), %ecx	popf	movl %ecx, 64(%eax)	/* 68(%eax) is another esp */	movw %ss, %cx	movl %ecx, 72(%eax)		movl 0(%esp), %ecx		/* %eip */	movl %ecx, 56(%eax)	leal 4(%esp), %ecx		/* %esp */	movl %ecx, 28(%eax)	movl %ecx, 68(%eax)		movl 40(%eax), %ecx		/* restore %ecx */	movl $0, %eax	ret #else	/* x86-64 */ .globl vx32_getcontextvx32_getcontext:	// mcontext_t pointer is in %rdi	movq %r8, 0(%rdi)	movq %r9, 8(%rdi)	movq %r10, 16(%rdi)	movq %r11, 24(%rdi)	movq %r12, 32(%rdi)	movq %r13, 40(%rdi)	movq %r14, 48(%rdi)	movq %r15, 56(%rdi)	movq %rdi, 64(%rdi)	movq %rsi, 72(%rdi)	movq %rbp, 80(%rdi)	movq %rbx, 88(%rdi)	movq %rdx, 96(%rdi)	movq $1, 104(%rdi)	/* %rax */	movq %rcx, 112(%rdi)	/* 120(%rdi) is rsp */	leaq 8(%rsp), %rax	movq %rax, 120(%rdi)	/* 128(%rdi) is rip */	movq 0(%rsp), %rax	movq %rax, 128(%rdi)	/* 136(%rdi) is eflags */	pushf	popq %rax	movq %rax, 136(%rdi)	/* 144(%rdi) is cs, gs, fs, pad */	xorq %rax, %rax	movw %fs, %ax	shlq $16, %rax	movw %gs, %ax	shlq $16, %rax	movw %cs, %ax	movq %rax, 144(%rdi)	/* 152(%rdi) is err */	movq $0, 152(%rdi)	/* 160(%rdi) is trapno */	movq $0, 160(%rdi)	/* 168(%rdi) is oldmask */	movq $0, 168(%rdi)	/* 176(%rdi) is cr2 */	movq $0, 176(%rdi)	movq $0, %rax	ret #endif