cerror.s

Newlib 嵌入式 C库 标准实现代码

! Set errno.
! This function is called by all the syscall stubs.
!
! FIXME: We assume errno is the first member of struct _reent.
! Not sure what to do about this.

#include <sys/syscallasm.h>

	DATA_SECTION
	ALIGN (4)
	GLOBAL (ASM_SYMBOL (errno))	! FIXME: ASM_PRIVATE_SYMBOL ?
ASM_SYMBOL (errno):
	WORD (0)

	TEXT_SECTION
	ALIGN (4)

	GLOBAL (ASM_PRIVATE_SYMBOL (cerror))
ASM_PRIVATE_SYMBOL (cerror):
	sethi	%hi (ASM_SYMBOL (errno)),%g1
	stw	%o0,[%g1+%lo (ASM_SYMBOL (errno))]
	jmpl	%o7+8,%g0
	mov	-1,%o0

	GLOBAL (ASM_PRIVATE_SYMBOL (cerror_r))
ASM_PRIVATE_SYMBOL (cerror_r):
	stw	%o0,[%o1]
	jmpl	%o7+8,%g0
	mov	-1,%o0