Subversion Repositories openrisc_2011-10-31

### entry point code

        .macro gdbasm_startup

        # Align the stack pointer to an 8-byte boundary.

        lhi %r0,-8

        nr %r15,%r0

        # Reserve space for the standard stack frame:

        # back chain, and space for the callee to save its registers.

        ahi %r15,-104

        # Zero this frame's back chain pointer.

        xc 0(4,%r15),0(%r15)

        .endm

### Call a function.

        .macro gdbasm_call subr

        # Put the address of the constant in %r1, load the constant

        # (SUBR's address), and jump to it.

        bras %r1, .Lafterconst\@

        .long \subr

.Lafterconst\@:

        l %r1,0(%r1)

        basr %r14,%r1

        .endm

### Exit with a zero status.

        .macro gdbasm_exit0

        lhi %r2, 0

        svc 1

        .endm

### Standard subroutine prologue.

        .macro gdbasm_enter

        # Save all the callee-saves registers.  What the heck.

        stm %r6,%r15,24(%r15)

        # Allocate the stack frame, and write the back chain pointer.

        # Keep the original SP in %r11.

        lr %r1,%r15

        ahi %r15,-96

        st %r1,0(%r15)

        .endm

### Standard subroutine epilogue.

        .macro gdbasm_leave

        # Restore all our registers.  This also pops the frame, and

        # restores our return address.

        lm %r6,%r15,120(%r15)

        # Jump to the return address.

        br %r14

        .endm

### Several nops.

        .macro gdbasm_several_nops

        lr %r0, %r0

        lr %r0, %r0

        lr %r0, %r0

        lr %r0, %r0

        .endm

### Declare an `int' variable.

        .purgem gdbasm_datavar

        .macro gdbasm_datavar name value

        .data

\name:

        .long \value

        .endm