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Viewing changes to libc/stdlib/setjmp.S

  • Committer: Bazaar Package Importer
  • Author(s): Hakan Ardo
  • Date: 2007-12-29 16:20:03 UTC
  • mto: This revision was merged to the branch mainline in revision 7.
  • Revision ID: james.westby@ubuntu.com-20071229162003-xx0w1lyakuvfwrhm
Tags: upstream-1.4.7
Import upstream version 1.4.7

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Lines of Context:
libc/stdlib/setjmp.S
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  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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  POSSIBILITY OF SUCH DAMAGE. */
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/* $Id: setjmp.S,v 1.2 2005/11/10 19:52:44 aesok Exp $ */
 
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/* $Id: setjmp.S,v 1.2.2.1 2007/06/09 04:10:53 arcanum Exp $ */
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/*
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   setjmp.S
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_U(setjmp):
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        X_movw  ZL, jmpb_lo
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        in      r26, _SFR_IO_ADDR(SPL)
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        in      r27, _SFR_IO_ADDR(SPH)
 
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        in      r26, AVR_STACK_POINTER_LO_ADDR
 
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#ifdef _HAVE_AVR_STACK_POINTER_HI    
 
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        in      r27, AVR_STACK_POINTER_HI_ADDR
 
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#else
 
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    clr r27
 
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#endif
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        /* save program counter (return address) */
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        /* return address on stack (pushed by "call") is big endian! */
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        /* SP is post-decremented by "call" */
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        adiw    r26, 1
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#ifdef EIND  /* devices with >128K bytes of flash - none yet */
 
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#ifdef AVR_EXTENDED_INDIRECT_REG  /* devices with >128K bytes of flash */
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        ld      __tmp_reg__, X+
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        std     Z+23, __tmp_reg__
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#endif
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        std     Z+18,r26
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        std     Z+19,r27
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        /* save status register (I flag) */
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        in      __tmp_reg__, _SFR_IO_ADDR(SREG)
 
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        in      __tmp_reg__, AVR_STATUS_ADDR
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        std     Z+20, __tmp_reg__
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        /* save call-saved registers */
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        st      Z, r2
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        ld      __tmp_reg__, X+
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        /* interrupts disabled for shortest possible time (3 cycles) */
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        cli
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        out     _SFR_IO_ADDR(SPH), r31
 
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#ifdef _HAVE_AVR_STACK_POINTER_HI    
 
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        out     AVR_STACK_POINTER_HI_ADDR, r31
 
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#endif
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        /* Restore status register (including the interrupt enable flag).
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           Interrupts are re-enabled only after the next instruction.  */
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        out     _SFR_IO_ADDR(SREG), __tmp_reg__
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        out     _SFR_IO_ADDR(SPL), r30
 
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        out     AVR_STATUS_ADDR, __tmp_reg__
 
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        out     AVR_STACK_POINTER_LO_ADDR, r30
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        /* restore return address */
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        ld      r30,X+
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        ld      r31,X+
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#ifdef EIND
 
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#ifdef AVR_EXTENDED_INDIRECT_REG
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        ld      __tmp_reg__, X
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        out     _SFR_IO_ADDR(EIND), __tmp_reg__
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        .word   0x9419  /* eijmp */
 
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        out     AVR_EXTENDED_INDIRECT_ADDR, __tmp_reg__
 
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        eijmp
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#else
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        ijmp
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#endif