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      1 ### entry point code
      2         .macro gdbasm_startup
      3 
      4         # Align the stack pointer to an 8-byte boundary.
      5         lhi %r0,-8
      6         nr %r15,%r0
      7 
      8         # Reserve space for the standard stack frame:
      9         # back chain, and space for the callee to save its registers.
     10         ahi %r15,-104
     11 
     12         # Zero this frame's back chain pointer.
     13         xc 0(4,%r15),0(%r15)
     14         .endm
     15 
     16 
     17 ### Call a function.
     18         .macro gdbasm_call subr
     19 
     20         # Put the address of the constant in %r1, load the constant
     21         # (SUBR's address), and jump to it.
     22         bras %r1, .Lafterconst\@
     23         .long \subr
     24 .Lafterconst\@:
     25         l %r1,0(%r1)
     26         basr %r14,%r1
     27         .endm
     28 
     29 
     30 ### Exit with a zero status.
     31         .macro gdbasm_exit0
     32         lhi %r2, 0
     33         svc 1
     34         .endm
     35 
     36 ### Standard subroutine prologue.
     37         .macro gdbasm_enter
     38 
     39         # Save all the callee-saves registers.  What the heck.
     40         stm %r6,%r15,24(%r15)
     41 
     42         # Allocate the stack frame, and write the back chain pointer.
     43         # Keep the original SP in %r11.
     44         lr %r1,%r15
     45         ahi %r15,-96
     46         st %r1,0(%r15)
     47         .endm
     48 
     49 
     50 ### Standard subroutine epilogue.
     51         .macro gdbasm_leave
     52 
     53         # Restore all our registers.  This also pops the frame, and
     54 	# restores our return address.
     55         lm %r6,%r15,120(%r15)
     56 
     57         # Jump to the return address.
     58         br %r14
     59 
     60         .endm
     61 
     62 ### Several nops.
     63         .macro gdbasm_several_nops
     64         lr %r0, %r0
     65         lr %r0, %r0
     66         lr %r0, %r0
     67         lr %r0, %r0
     68         .endm
     69 
     70 ### Declare an `int' variable.
     71 	.purgem gdbasm_datavar
     72         .macro gdbasm_datavar name value
     73         .data
     74 \name:
     75         .long \value
     76         .endm
     77