513 lines
14 KiB
ArmAsm
513 lines
14 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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.csect .text[PR]
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#### Invoke the garbage collector. r0 contains the return address
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.globl .caml_call_gc
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.caml_call_gc:
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# Set up stack frame
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stwu 1, -0x1C0(1)
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# 0x1C0 = 4*32 (int regs) + 8*32 (float regs) + 64 (space for C call)
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# Record last return address into Caml code
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lwz 11, L..caml_last_return_address(2)
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stw 0, 0(11)
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# Record return address into call_gc stub code
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mflr 0
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stw 0, 0x1C0+8(1)
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# Record lowest stack address
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lwz 11, L..caml_bottom_of_stack(2)
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addi 0, 1, 0x1C0
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stw 0, 0(11)
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# Record pointer to register array
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lwz 11, L..caml_gc_regs(2)
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addi 0, 1, 8*32 + 64
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stw 0, 0(11)
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# Save current allocation pointer for debugging purposes
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lwz 11, L..young_ptr(2)
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stw 31, 0(11)
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# Save exception pointer (if e.g. a sighandler raises)
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lwz 11, L..caml_exception_pointer(2)
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stw 29, 0(11)
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# Save all registers used by the code generator
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addi 11, 1, 8*32 + 64 - 4
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stwu 3, 4(11)
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stwu 4, 4(11)
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stwu 5, 4(11)
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stwu 6, 4(11)
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stwu 7, 4(11)
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stwu 8, 4(11)
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stwu 9, 4(11)
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stwu 10, 4(11)
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stwu 14, 4(11)
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stwu 15, 4(11)
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stwu 16, 4(11)
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stwu 17, 4(11)
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stwu 18, 4(11)
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stwu 19, 4(11)
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stwu 20, 4(11)
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stwu 21, 4(11)
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stwu 22, 4(11)
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stwu 23, 4(11)
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stwu 24, 4(11)
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stwu 25, 4(11)
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stwu 26, 4(11)
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stwu 27, 4(11)
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stwu 28, 4(11)
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addi 11, 1, 64 - 8
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stfdu 1, 8(11)
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stfdu 2, 8(11)
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stfdu 3, 8(11)
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stfdu 4, 8(11)
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stfdu 5, 8(11)
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stfdu 6, 8(11)
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stfdu 7, 8(11)
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stfdu 8, 8(11)
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stfdu 9, 8(11)
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stfdu 10, 8(11)
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stfdu 11, 8(11)
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stfdu 12, 8(11)
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stfdu 13, 8(11)
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stfdu 14, 8(11)
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stfdu 15, 8(11)
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stfdu 16, 8(11)
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stfdu 17, 8(11)
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stfdu 18, 8(11)
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stfdu 19, 8(11)
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stfdu 20, 8(11)
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stfdu 21, 8(11)
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stfdu 22, 8(11)
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stfdu 23, 8(11)
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stfdu 24, 8(11)
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stfdu 25, 8(11)
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stfdu 26, 8(11)
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stfdu 27, 8(11)
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stfdu 28, 8(11)
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stfdu 29, 8(11)
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stfdu 30, 8(11)
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stfdu 31, 8(11)
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# Call the GC
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bl .garbage_collection
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or 0, 0, 0
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# Reload new allocation pointer and allocation limit
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lwz 11, L..young_ptr(2)
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lwz 31, 0(11)
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lwz 11, L..young_limit(2)
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lwz 30, 0(11)
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# Restore all regs used by the code generator
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addi 11, 1, 8*32 + 64 - 4
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lwzu 3, 4(11)
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lwzu 4, 4(11)
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lwzu 5, 4(11)
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lwzu 6, 4(11)
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lwzu 7, 4(11)
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lwzu 8, 4(11)
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lwzu 9, 4(11)
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lwzu 10, 4(11)
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lwzu 14, 4(11)
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lwzu 15, 4(11)
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lwzu 16, 4(11)
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lwzu 17, 4(11)
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lwzu 18, 4(11)
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lwzu 19, 4(11)
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lwzu 20, 4(11)
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lwzu 21, 4(11)
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lwzu 22, 4(11)
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lwzu 23, 4(11)
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lwzu 24, 4(11)
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lwzu 25, 4(11)
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lwzu 26, 4(11)
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lwzu 27, 4(11)
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lwzu 28, 4(11)
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addi 11, 1, 64 - 8
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lfdu 1, 8(11)
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lfdu 2, 8(11)
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lfdu 3, 8(11)
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lfdu 4, 8(11)
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lfdu 5, 8(11)
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lfdu 6, 8(11)
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lfdu 7, 8(11)
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lfdu 8, 8(11)
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lfdu 9, 8(11)
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lfdu 10, 8(11)
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lfdu 11, 8(11)
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lfdu 12, 8(11)
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lfdu 13, 8(11)
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lfdu 14, 8(11)
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lfdu 15, 8(11)
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lfdu 16, 8(11)
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lfdu 17, 8(11)
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lfdu 18, 8(11)
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lfdu 19, 8(11)
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lfdu 20, 8(11)
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lfdu 21, 8(11)
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lfdu 22, 8(11)
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lfdu 23, 8(11)
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lfdu 24, 8(11)
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lfdu 25, 8(11)
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lfdu 26, 8(11)
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lfdu 27, 8(11)
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lfdu 28, 8(11)
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lfdu 29, 8(11)
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lfdu 30, 8(11)
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lfdu 31, 8(11)
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# Return to caller (the stub code), leaving return address into
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# Caml code in the link register
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lwz 0, 0x1C0+8(1)
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mtctr 0
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lwz 11, L..caml_last_return_address(2)
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lwz 0, 0(11)
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addic 0, 0, -16 # Restart the allocation (4 instructions)
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mtlr 0
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# Say we are back into Caml code
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li 12, 0
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stw 12, 0(11) # 11 still points to caml_last_return_address
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# Deallocate stack frame
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addi 1, 1, 0x1C0
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# Return
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bctr
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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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# Save return address in 25
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mflr 25
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# Record lowest stack address and return address
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lwz 27, L..caml_bottom_of_stack(2)
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lwz 24, L..caml_last_return_address(2)
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stw 1, 0(27)
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stw 25, 0(24)
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# Make the exception handler and alloc ptr available to the C code
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lwz 27, L..young_ptr(2)
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lwz 26, L..caml_exception_pointer(2)
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stw 31, 0(27)
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stw 29, 0(26)
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# Preserve RTOC and return address in callee-save registers
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# The C function will preserve them, and the Caml code does not
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# expect them to be preserved
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# Return address is in 25, RTOC is in 26, pointer to young_ptr in 27,
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# pointer to caml_last_return_address is in 24
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# Call the function (descriptor in 11)
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lwz 0, 0(11)
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mr 26, 2
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mtlr 0
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lwz 2, 4(11)
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lwz 11, 8(11)
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blrl
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# Restore return address
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mtlr 25
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# Restore RTOC
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mr 2, 26
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# Reload allocation pointer
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lwz 31, 0(27) # 27 still points to young_ptr
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# Say we are back into Caml code
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li 12, 0
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stw 12, 0(24) # 24 still points to caml_last_return_address
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# Return to caller
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blr
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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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# Reload Caml global registers
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lwz 4, L..caml_exception_pointer(2)
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lwz 5, L..young_ptr(2)
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lwz 6, L..young_limit(2)
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lwz 1, 0(4)
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lwz 31, 0(5)
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lwz 30, 0(6)
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# Say we are back into Caml code
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lwz 4, L..caml_last_return_address(2)
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li 0, 0
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stw 0, 0(4)
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# Pop trap frame
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lwz 0, 0(1)
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lwz 29, 4(1)
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mtlr 0
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lwz 2, 20(1)
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addi 1, 1, 24
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# Branch to handler
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blr
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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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lwz 11, L..caml_program(2)
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#### Code shared between caml_start_program and callback*
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L..102:
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mflr 0
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# Save return address
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stw 0, 8(1)
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# Save all callee-save registers
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stw 13, -76(1)
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stw 14, -72(1)
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stw 15, -68(1)
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stw 16, -64(1)
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stw 17, -60(1)
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stw 18, -56(1)
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stw 19, -52(1)
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stw 20, -48(1)
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stw 21, -44(1)
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stw 22, -40(1)
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stw 23, -36(1)
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stw 24, -32(1)
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stw 25, -28(1)
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stw 26, -24(1)
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stw 27, -20(1)
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stw 28, -16(1)
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stw 29, -12(1)
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stw 30, -8(1)
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stw 31, -4(1)
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stfd 14, -224(1)
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stfd 15, -216(1)
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stfd 16, -208(1)
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stfd 17, -200(1)
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stfd 18, -192(1)
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stfd 19, -184(1)
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stfd 20, -176(1)
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stfd 21, -168(1)
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stfd 22, -160(1)
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stfd 23, -152(1)
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stfd 24, -144(1)
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stfd 25, -136(1)
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stfd 26, -128(1)
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stfd 27, -120(1)
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stfd 28, -112(1)
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stfd 29, -104(1)
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stfd 30, -96(1)
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stfd 31, -88(1)
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# Allocate and link stack frame
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stwu 1, -280(1)
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# Set up a callback link
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addi 1, 1, -24
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lwz 9, L..caml_bottom_of_stack(2)
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lwz 10, L..caml_last_return_address(2)
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lwz 12, L..caml_gc_regs(2)
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lwz 9, 0(9)
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lwz 10, 0(10)
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lwz 12, 0(12)
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stw 9, 0(1)
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stw 10, 4(1)
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stw 12, 8(1)
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# Build an exception handler to catch exceptions escaping out of Caml
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bl L..103
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b L..104
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L..103:
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addi 1, 1, -24
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lwz 9, L..caml_exception_pointer(2)
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mflr 0
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lwz 29, 0(9)
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stw 0, 0(1)
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stw 29, 4(1)
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stw 2, 20(1)
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mr 29, 1
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# Reload allocation pointers
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lwz 9, L..young_ptr(2)
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lwz 10, L..young_limit(2)
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lwz 31, 0(9)
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lwz 30, 0(10)
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# Say we are back into Caml code
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lwz 9, L..caml_last_return_address(2)
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li 0, 0
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stw 0, 0(9)
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# Call the Caml code
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lwz 0, 0(11)
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stw 2, 20(1)
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mtlr 0
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lwz 2, 4(11)
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L..105:
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blrl
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lwz 2, 20(1)
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# Pop the trap frame, restoring caml_exception_pointer
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lwz 9, 4(1)
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lwz 10, L..caml_exception_pointer(2)
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addi 1, 1, 24
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stw 9, 0(10)
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# Pop the callback link, restoring the global variables
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L..106:
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lwz 7, 0(1)
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lwz 8, 4(1)
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lwz 9, 8(1)
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lwz 10, L..caml_bottom_of_stack(2)
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lwz 11, L..caml_last_return_address(2)
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lwz 12, L..caml_gc_regs(2)
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stw 7, 0(10)
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stw 8, 0(11)
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stw 9, 0(12)
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addi 1, 1, 24
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# Update allocation pointer
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lwz 11, L..young_ptr(2)
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stw 31, 0(11)
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# Deallocate stack frame
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addi 1, 1, 280
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# Restore callee-save registers
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lwz 13, -76(1)
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lwz 14, -72(1)
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lwz 15, -68(1)
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lwz 16, -64(1)
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lwz 17, -60(1)
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lwz 18, -56(1)
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lwz 19, -52(1)
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lwz 20, -48(1)
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lwz 21, -44(1)
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lwz 22, -40(1)
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lwz 23, -36(1)
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lwz 24, -32(1)
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lwz 25, -28(1)
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lwz 26, -24(1)
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lwz 27, -20(1)
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lwz 28, -16(1)
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lwz 29, -12(1)
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lwz 30, -8(1)
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lwz 31, -4(1)
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lfd 14, -224(1)
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lfd 15, -216(1)
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lfd 16, -208(1)
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lfd 17, -200(1)
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lfd 18, -192(1)
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lfd 19, -184(1)
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lfd 20, -176(1)
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lfd 21, -168(1)
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lfd 22, -160(1)
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lfd 23, -152(1)
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lfd 24, -144(1)
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lfd 25, -136(1)
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lfd 26, -128(1)
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lfd 27, -120(1)
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lfd 28, -112(1)
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lfd 29, -104(1)
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lfd 30, -96(1)
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lfd 31, -88(1)
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# Reload return address
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lwz 0, 8(1)
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mtlr 0
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# Return
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blr
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# The trap handler:
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L..104:
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# Update caml_exception_pointer
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lwz 9, L..caml_exception_pointer(2)
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stw 29, 0(9)
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# Encode exception bucket as an exception result and return it
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ori 3, 3, 2
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b L..106
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#### Callback from C to Caml
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.globl .callback_exn
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.callback_exn:
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# Initial shuffling of arguments
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mr 0, 3 # Closure
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mr 3, 4 # Argument
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mr 4, 0
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lwz 11, 0(4) # Code pointer
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b L..102
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.globl .callback2_exn
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.callback2_exn:
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mr 0, 3 # Closure
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mr 3, 4 # First argument
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mr 4, 5 # Second argument
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mr 5, 0
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lwz 11, L..caml_apply2(2)
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b L..102
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.globl .callback3_exn
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.callback3_exn:
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mr 0, 3 # Closure
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mr 3, 4 # First argument
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mr 4, 5 # Second argument
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mr 5, 6 # Third argument
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mr 6, 0
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lwz 11, L..caml_apply3(2)
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b L..102
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#### Frame table
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.csect .data[RW]
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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 L..105 + 4 # return address into callback
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.short -1 # negative size count => use callback link
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.short 0 # no roots here
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#### TOC entries
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.toc
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L..young_limit:
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.tc young_limit[TC], young_limit
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L..young_ptr:
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.tc young_ptr[TC], young_ptr
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L..caml_bottom_of_stack:
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.tc caml_bottom_of_stack[TC], caml_bottom_of_stack
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L..caml_last_return_address:
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.tc caml_last_return_address[TC], caml_last_return_address
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L..caml_gc_regs:
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.tc caml_gc_regs[TC], caml_gc_regs
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L..caml_exception_pointer:
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.tc caml_exception_pointer[TC], caml_exception_pointer
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L..gc_entry_regs:
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.tc gc_entry_regs[TC], gc_entry_regs
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L..gc_entry_float_regs:
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.tc gc_entry_float_regs[TC], gc_entry_float_regs
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L..caml_program:
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.tc caml_program[TC], caml_program
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L..caml_apply2:
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.tc caml_apply2[TC], caml_apply2
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L..caml_apply3:
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.tc caml_apply3[TC], caml_apply3
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#### Function closures
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.csect caml_call_gc[DS]
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caml_call_gc:
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.long .caml_call_gc, TOC[tc0], 0
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.globl caml_c_call
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.csect caml_c_call[DS]
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caml_c_call:
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.long .caml_c_call, TOC[tc0], 0
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.globl raise_caml_exception
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.csect raise_caml_exception[DS]
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raise_caml_exception:
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.long .raise_caml_exception, TOC[tc0], 0
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.globl caml_start_program
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.csect caml_start_program[DS]
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caml_start_program:
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.long .caml_start_program, TOC[tc0], 0
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.globl callback_exn
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.csect callback_exn[DS]
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callback_exn:
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.long .callback_exn, TOC[tc0], 0
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.globl callback2_exn
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.csect callback2_exn[DS]
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callback2_exn:
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.long .callback2_exn, TOC[tc0], 0
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.globl callback3_exn
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.csect callback3_exn[DS]
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callback3_exn:
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.long .callback3_exn, TOC[tc0], 0
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