i386/i386/thr_getcontext.S

56 	movl	4(%esp), %edx		/* get address of mcontext */
57 	cmpl	$0, %edx		/* check for null pointer */
61 1:	cmpl	$MC_LEN, MC_LEN_OFFSET(%edx)	/* is context valid? */
65 2:	/*movl	4(%edx), %gs*/		/* we don't touch %gs */
66 	movw	8(%edx), %fs
67 	movw	12(%edx), %es
68 	movw	16(%edx), %ds
69 	movw	76(%edx), %ss
70 	movl	20(%edx), %edi
71 	movl	24(%edx), %esi
72 	movl	28(%edx), %ebp
74 	movl	72(%edx), %esp		/* switch to context defined stack */
75 	pushl	60(%edx)		/* push return address on stack */
76 	pushl	44(%edx)		/* push ecx on stack */
77 	pushl	48(%edx)		/* push eax on stack */
86 	cmpl	$MC_OWNEDFP_FPU, MC_OWNEDFP_OFFSET(%edx)
88 	cmpl	$MC_OWNEDFP_PCB, MC_OWNEDFP_OFFSET(%edx)
90 3:	cmpl	$MC_FPFMT_387, MC_FPFMT_OFFSET(%edx)
92 	frstor	MC_FPREGS_OFFSET(%edx)	/* restore 387 FP regs */
94 4:	cmpl	$MC_FPFMT_XMM, MC_FPFMT_OFFSET(%edx)
96 	fxrstor	MC_FPREGS_OFFSET(%edx)	/* restore XMM FP regs */
99 	fldcw	MC_FP_CW_OFFSET(%edx)
100 6:	pushl	68(%edx)		/* push flags register on stack*/
101 	movl	36(%edx), %ebx		/* restore ebx and edx */
102 	movl	40(%edx), %edx
122 	pushl	%edx			/* save edx */
123 	movl	8(%esp), %edx		/* get address of mcontext */
124 	cmpl	$0, %edx		/* check for null pointer */
126 	popl	%edx			/* restore edx and stack */
129 1:	/*movw	%gs, 4(%edx)*/		/* we don't touch %gs */
130 	movw	%fs, 8(%edx)
131 	movw	%es, 12(%edx)
132 	movw	%ds, 16(%edx)
133 	movw	%ss, 76(%edx)
134 	movl	%edi, 20(%edx)
135 	movl	%esi, 24(%edx)
136 	movl	%ebp, 28(%edx)
137 	movl	%ebx, 36(%edx)
138 	movl	$1, 48(%edx)		/* store successful return in eax */
139 	popl	%eax			/* get saved value of edx */
140 	movl	%eax, 40(%edx)		/* save edx */
141 	movl	%ecx, 44(%edx)
143 	movl	%eax, 60(%edx)		/* save return address */
144 	fnstcw	MC_FP_CW_OFFSET(%edx)
145 	movl	$MC_LEN, MC_LEN_OFFSET(%edx)
146 	movl	$MC_FPFMT_NODEV, MC_FPFMT_OFFSET(%edx)	/* no FP */
147 	movl	$MC_OWNEDFP_NONE, MC_OWNEDFP_OFFSET(%edx) /* no FP */
150 	movl	%eax, 68(%edx)		/* store eflags */
153 	movl	%eax, 72(%edx)		/*   stack; account for this     */
154 	movl	40(%edx), %edx		/* restore edx -- is this needed? */