In files s_ceil.s, sf_ceil.s, s_floor.s and sf_floor.s the local variables
are bellow the stack pointer. For example, in sf_floor.s:

ENTRY(floorf)
	pushl	%ebp
	movl	%esp,%ebp
	subl	$8,%esp

	fstcw	-12(%ebp)	...

libm.a sources were provided by Cygnus

I only found out recently that in the release version, the exception code
uses the user stack, destroying around 100 bytes below the stack pointer.
The result is that ceil and floor from libm.a can no longer be used with
fp emulation

Upgrade to v2.02.