linux/include/asm-i386/frame.i

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#include <asm/dwarf2.h>
/* The annotation hides the frame from the unwinder and makes it look
like a ordinary ebp save/restore. This avoids some special cases for
frame pointer later */
#ifdef CONFIG_FRAME_POINTER
.macro FRAME
pushl %ebp
CFI_ADJUST_CFA_OFFSET 4
CFI_REL_OFFSET ebp,0
movl %esp,%ebp
.endm
.macro ENDFRAME
popl %ebp
CFI_ADJUST_CFA_OFFSET -4
CFI_RESTORE ebp
.endm
#else
.macro FRAME
.endm
.macro ENDFRAME
.endm
#endif