260 lines
7.9 KiB
ArmAsm
260 lines
7.9 KiB
ArmAsm
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|* *
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|* Objective Caml *
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|* *
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|* Xavier Leroy, projet Cristal, INRIA Rocquencourt *
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|* *
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|* Copyright 1996 Institut National de Recherche en Informatique et *
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|* Automatique. Distributed only by permission. *
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|* *
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|***********************************************************************
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| $Id$
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| Asm part of the runtime system, Motorola 68k processor
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.comm _young_limit, 4
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.comm _young_ptr, 4
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.comm _gc_entry_regs, 48
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.comm _caml_bottom_of_stack, 4
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.comm _caml_top_of_stack, 4
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.comm _caml_last_return_address, 4
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.comm _caml_exception_pointer, 4
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.comm _caml_requested_size, 4
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| Allocation
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.text
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.globl _caml_call_gc
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.globl _caml_alloc1
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.globl _caml_alloc2
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.globl _caml_alloc3
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.globl _caml_alloc
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_caml_call_gc:
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| Save desired size
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movel d5, _caml_requested_size
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| Record lowest stack address and return address
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movel a7@, _caml_last_return_address
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movel a7, d5
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addql #4, d5
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movel d5, _caml_bottom_of_stack
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| Record current allocation pointer (for debugging)
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movel d6, _young_ptr
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| Save all regs used by the code generator
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movel a0, _gc_entry_regs
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movel a1, _gc_entry_regs + 4
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movel a2, _gc_entry_regs + 8
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movel a3, _gc_entry_regs + 12
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movel a4, _gc_entry_regs + 16
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movel a5, _gc_entry_regs + 20
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movel a6, _gc_entry_regs + 24
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movel d0, _gc_entry_regs + 28
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movel d1, _gc_entry_regs + 32
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movel d2, _gc_entry_regs + 36
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movel d3, _gc_entry_regs + 40
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movel d4, _gc_entry_regs + 44
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fmovem fp0-fp7, a7@-
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| Call the garbage collector
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jbsr _garbage_collection
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| Restore all regs used by the code generator
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fmovem a7@+, fp0-fp7
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movel _gc_entry_regs, a0
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movel _gc_entry_regs + 4, a1
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movel _gc_entry_regs + 8, a2
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movel _gc_entry_regs + 12, a3
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movel _gc_entry_regs + 16, a4
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movel _gc_entry_regs + 20, a5
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movel _gc_entry_regs + 24, a6
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movel _gc_entry_regs + 28, d0
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movel _gc_entry_regs + 32, d1
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movel _gc_entry_regs + 36, d2
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movel _gc_entry_regs + 40, d3
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movel _gc_entry_regs + 44, d4
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| Reload allocation pointer and allocate block
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movel _young_ptr, d6
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subl _caml_requested_size, d6
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| Return to caller
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rts
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_caml_alloc1:
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subql #8, d6
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cmpl _young_limit, d6
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bcs L100
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rts
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L100: moveq #8, d5
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bra _caml_call_gc
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_caml_alloc2:
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subl #12, d6
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cmpl _young_limit, d6
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bcs L101
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rts
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L101: moveq #12, d5
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bra _caml_call_gc
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_caml_alloc3:
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subl #16, d6
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cmpl _young_limit, d6
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bcs L102
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rts
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L102: moveq #16, d5
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bra _caml_call_gc
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_caml_alloc:
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subl d5, d6
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cmpl _young_limit, d6
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bcs _caml_call_gc
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rts
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| Call a C function from Caml
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.globl _caml_c_call
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_caml_c_call:
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| Record lowest stack address and return address
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movel a7@+, _caml_last_return_address
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movel a7, _caml_bottom_of_stack
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| Save allocation pointer and exception pointer
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movel d6, _young_ptr
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movel d7, _caml_exception_pointer
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| Call the function (address in a0)
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jbsr a0@
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| Reload allocation pointer
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movel _young_ptr, d6
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| Return to caller
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movel _caml_last_return_address, a1
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jmp a1@
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| Start the Caml program
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.globl _caml_start_program
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_caml_start_program:
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| Save callee-save registers
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moveml a2-a6/d2-d7, a7@-
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fmovem fp2-fp7, a7@-
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| Build an exception handler
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pea L103
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pea 0
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movel a7, d7
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| Record highest stack address
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movel a7, _caml_top_of_stack
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| Load allocation pointer
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movel _young_ptr, d6
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| Go for it
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jbsr _caml_program
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| Pop handler
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addql #8, a7
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| Zero return code
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clrl d0
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bra L104
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L103:
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| Return exception bucket
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movel a0, d0
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L104:
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| Restore registers and return
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fmovem a7@+, fp2-fp7
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moveml a7@+, a2-a6/d2-d7
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rts
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| Raise an exception from C
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.globl _raise_caml_exception
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_raise_caml_exception:
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movel a7@(4), a0 | exception bucket
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movel _young_ptr, d6
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movel _caml_exception_pointer, a7
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movel a7@+, d7
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rts
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| Callback from C to Caml
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.globl _callback
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_callback:
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link a6, #0
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| Save callee-save registers
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moveml a2-a6/d2-d7, a7@-
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fmovem fp2-fp7, a7@-
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| Initial loading of arguments
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movel a6@(8), a1 | closure
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movel a6@(12), a0 | argument
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movel a1@(0), a5 | code pointer
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L106:
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| Build a callback link
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movel _caml_last_return_address, a7@-
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movel _caml_bottom_of_stack, a7@-
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| Build an exception handler
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pea L108
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movel _caml_exception_pointer, a7@-
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movel a7, d7
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| Load allocation pointer
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movel _young_ptr, d6
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| Call the Caml code
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jbsr a5@
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L107:
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| Move result where C code expects it
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movel a0, d0
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| Save allocation pointer
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movel d6, _young_ptr
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| Pop the exception handler
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movel a7@+, _caml_exception_pointer
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addql #4, a7
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| Pop the callback link, restoring the global variables
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| used by caml_c_call
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movel a7@+, _caml_bottom_of_stack
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movel a7@+, _caml_last_return_address
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| Restore callee-save registers and return
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fmovem a7@+, fp2-fp7
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moveml a7@+, a2-a6/d2-d7
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unlk a6
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rts
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L108:
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| Exception handler
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| Save allocation pointer and exception pointer
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movel d6, _young_ptr
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movel d7, _caml_exception_pointer
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| Pop the callback link, restoring the global variables
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| used by caml_c_call
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movel a7@+, _caml_bottom_of_stack
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movel a7@+, _caml_last_return_address
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| Re-raise the exception through mlraise,
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| so that local C roots are cleaned up correctly.
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movel a0, a7@- | exn bucket is the argument
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jbsr _mlraise | never returns
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.globl _callback2
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_callback2:
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link a6, #0
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| Save callee-save registers
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moveml a2-a6/d2-d7, a7@-
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fmovem fp2-fp7, a7@-
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| Initial loading of arguments
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movel a6@(8), a2 | closure
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movel a6@(12), a0 | first argument
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movel a6@(16), a1 | second argument
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lea _caml_apply2, a5 | code pointer
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bra L106
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.globl _callback3
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_callback3:
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link a6, #0
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| Save callee-save registers
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moveml a2-a6/d2-d7, a7@-
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fmovem fp2-fp7, a7@-
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| Initial loading of arguments
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movel a6@(8), a3 | closure
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movel a6@(12), a0 | first argument
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movel a6@(16), a1 | second argument
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movel a6@(20), a2 | third argument
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lea _caml_apply3, a5 | code pointer
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bra L106
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.data
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.globl _system_frametable
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_system_frametable:
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.long 1 | one descriptor
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.long L107 | return address into callback
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.word -1 | negative frame size => use callback link
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.word 0 | no roots here
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