Subversion Repositories openrisc_2011-10-31

### entry point code

        .macro gdbasm_startup

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

        lghi %r0,-16

        ngr %r15,%r0

        # Reserve space for the standard stack frame:

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

        aghi %r15,-168

        # Zero this frame's back chain pointer.

        xc 0(8,%r15),0(%r15)

        .endm

### Call a function.

        .macro gdbasm_call subr

        brasl %r14, \subr

        .endm

### Exit with a zero status.

        .macro gdbasm_exit0

        lghi %r2, 0

        svc 1

        .endm

### Standard subroutine prologue.

        .macro gdbasm_enter

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

        stmg %r6,%r15,48(%r15)

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

        # Keep the original SP in %r11.

        lgr %r11,%r15

        aghi %r15,-168

        stg %r11,0(%r15)

        .endm

### Standard subroutine epilogue.

        .macro gdbasm_leave

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

        # restores our return address.

        lmg %r6,%r15,216(%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