417 lines
13 KiB
ArmAsm
417 lines
13 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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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../LICENSE. */
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/* */
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/*********************************************************************/
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/* $Id$ */
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.macro Addrglobal /* reg, glob */
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addis $0, 0, ha16($1)
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addi $0, $0, lo16($1)
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.endmacro
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.macro Loadglobal /* reg,glob,tmp */
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addis $2, 0, ha16($1)
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lwz $0, lo16($1)($2)
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.endmacro
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.macro Storeglobal /* reg,glob,tmp */
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addis $2, 0, ha16($1)
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stw $0, lo16($1)($2)
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.endmacro
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.text
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/* Invoke the garbage collector. */
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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 r1, -0x1A0(r1)
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/* 0x1A0 = 4*32 (int regs) + 8*32 (float regs) + 32 (space for C call) */
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/* Record return address into Caml code */
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mflr r0
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Storeglobal r0, _caml_last_return_address, r11
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/* Record lowest stack address */
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addi r0, r1, 0x1A0
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Storeglobal r0, _caml_bottom_of_stack, r11
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/* Record pointer to register array */
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addi r0, r1, 8*32 + 32
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Storeglobal r0, _caml_gc_regs, r11
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/* Save current allocation pointer for debugging purposes */
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Storeglobal r31, _caml_young_ptr, r11
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/* Save exception pointer (if e.g. a sighandler raises) */
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Storeglobal r29, _caml_exception_pointer, r11
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/* Save all registers used by the code generator */
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addi r11, r1, 8*32 + 32 - 4
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stwu r3, 4(r11)
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stwu r4, 4(r11)
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stwu r5, 4(r11)
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stwu r6, 4(r11)
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stwu r7, 4(r11)
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stwu r8, 4(r11)
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stwu r9, 4(r11)
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stwu r10, 4(r11)
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stwu r14, 4(r11)
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stwu r15, 4(r11)
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stwu r16, 4(r11)
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stwu r17, 4(r11)
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stwu r18, 4(r11)
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stwu r19, 4(r11)
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stwu r20, 4(r11)
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stwu r21, 4(r11)
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stwu r22, 4(r11)
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stwu r23, 4(r11)
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stwu r24, 4(r11)
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stwu r25, 4(r11)
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stwu r26, 4(r11)
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stwu r27, 4(r11)
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stwu r28, 4(r11)
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addi r11, r1, 32 - 8
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stfdu f1, 8(r11)
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stfdu f2, 8(r11)
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stfdu f3, 8(r11)
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stfdu f4, 8(r11)
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stfdu f5, 8(r11)
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stfdu f6, 8(r11)
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stfdu f7, 8(r11)
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stfdu f8, 8(r11)
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stfdu f9, 8(r11)
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stfdu f10, 8(r11)
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stfdu f11, 8(r11)
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stfdu f12, 8(r11)
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stfdu f13, 8(r11)
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stfdu f14, 8(r11)
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stfdu f15, 8(r11)
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stfdu f16, 8(r11)
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stfdu f17, 8(r11)
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stfdu f18, 8(r11)
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stfdu f19, 8(r11)
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stfdu f20, 8(r11)
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stfdu f21, 8(r11)
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stfdu f22, 8(r11)
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stfdu f23, 8(r11)
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stfdu f24, 8(r11)
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stfdu f25, 8(r11)
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stfdu f26, 8(r11)
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stfdu f27, 8(r11)
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stfdu f28, 8(r11)
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stfdu f29, 8(r11)
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stfdu f30, 8(r11)
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stfdu f31, 8(r11)
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/* Call the GC */
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bl _caml_garbage_collection
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/* Reload new allocation pointer and allocation limit */
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Loadglobal r31, _caml_young_ptr, r11
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Loadglobal r30, _caml_young_limit, r11
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/* Restore all regs used by the code generator */
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addi r11, r1, 8*32 + 32 - 4
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lwzu r3, 4(r11)
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lwzu r4, 4(r11)
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lwzu r5, 4(r11)
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lwzu r6, 4(r11)
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lwzu r7, 4(r11)
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lwzu r8, 4(r11)
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lwzu r9, 4(r11)
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lwzu r10, 4(r11)
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lwzu r14, 4(r11)
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lwzu r15, 4(r11)
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lwzu r16, 4(r11)
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lwzu r17, 4(r11)
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lwzu r18, 4(r11)
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lwzu r19, 4(r11)
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lwzu r20, 4(r11)
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lwzu r21, 4(r11)
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lwzu r22, 4(r11)
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lwzu r23, 4(r11)
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lwzu r24, 4(r11)
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lwzu r25, 4(r11)
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lwzu r26, 4(r11)
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lwzu r27, 4(r11)
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lwzu r28, 4(r11)
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addi r11, r1, 32 - 8
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lfdu f1, 8(r11)
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lfdu f2, 8(r11)
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lfdu f3, 8(r11)
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lfdu f4, 8(r11)
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lfdu f5, 8(r11)
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lfdu f6, 8(r11)
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lfdu f7, 8(r11)
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lfdu f8, 8(r11)
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lfdu f9, 8(r11)
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lfdu f10, 8(r11)
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lfdu f11, 8(r11)
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lfdu f12, 8(r11)
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lfdu f13, 8(r11)
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lfdu f14, 8(r11)
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lfdu f15, 8(r11)
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lfdu f16, 8(r11)
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lfdu f17, 8(r11)
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lfdu f18, 8(r11)
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lfdu f19, 8(r11)
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lfdu f20, 8(r11)
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lfdu f21, 8(r11)
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lfdu f22, 8(r11)
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lfdu f23, 8(r11)
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lfdu f24, 8(r11)
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lfdu f25, 8(r11)
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lfdu f26, 8(r11)
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lfdu f27, 8(r11)
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lfdu f28, 8(r11)
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lfdu f29, 8(r11)
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lfdu f30, 8(r11)
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lfdu f31, 8(r11)
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/* Return to caller, restarting the allocation */
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Loadglobal r0, _caml_last_return_address, r11
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addic r0, r0, -16 /* Restart the allocation (4 instructions) */
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mtlr r0
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/* Say we are back into Caml code */
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li r12, 0
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Storeglobal r12, _caml_last_return_address, r11
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/* Deallocate stack frame */
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addi r1, r1, 0x1A0
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/* Return */
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blr
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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 */
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mflr r25
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/* Get ready to call C function (address in 11) */
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mtctr r11
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/* Record lowest stack address and return address */
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Storeglobal r1, _caml_bottom_of_stack, r12
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Storeglobal r25, _caml_last_return_address, r12
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/* Make the exception handler and alloc ptr available to the C code */
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Storeglobal r31, _caml_young_ptr, r11
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Storeglobal r29, _caml_exception_pointer, r11
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/* Call the function (address in link register) */
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bctrl
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/* Restore return address (in 25, preserved by the C function) */
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mtlr r25
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/* Reload allocation pointer and allocation limit*/
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Loadglobal r31, _caml_young_ptr, r11
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Loadglobal r30, _caml_young_limit, r11
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/* Say we are back into Caml code */
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li r12, 0
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Storeglobal r12, _caml_last_return_address, r11
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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 _caml_raise_exception
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_caml_raise_exception:
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/* Reload Caml global registers */
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Loadglobal r1, _caml_exception_pointer, r11
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Loadglobal r31, _caml_young_ptr, r11
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Loadglobal r30, _caml_young_limit, r11
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/* Say we are back into Caml code */
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li r0, 0
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Storeglobal r0, _caml_last_return_address, r11
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/* Pop trap frame */
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lwz r0, 0(r1)
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lwz r29, 4(r1)
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mtlr r0
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addi r1, r1, 16
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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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Addrglobal r12, _caml_program
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/* Code shared between caml_start_program and caml_callback */
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L102:
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/* Allocate and link stack frame */
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stwu r1, -256(r1)
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/* Save return address */
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mflr r0
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stw r0, 256+4(r1)
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/* Save all callee-save registers */
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/* GPR 14 at sp+16 ... GPR 31 at sp+84
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FPR 14 at sp+92 ... FPR 31 at sp+228 */
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addi r11, r1, 16-4
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stwu r14, 4(r11)
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stwu r15, 4(r11)
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stwu r16, 4(r11)
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stwu r17, 4(r11)
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stwu r18, 4(r11)
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stwu r19, 4(r11)
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stwu r20, 4(r11)
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stwu r21, 4(r11)
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stwu r22, 4(r11)
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stwu r23, 4(r11)
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stwu r24, 4(r11)
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stwu r25, 4(r11)
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stwu r26, 4(r11)
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stwu r27, 4(r11)
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stwu r28, 4(r11)
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stwu r29, 4(r11)
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stwu r30, 4(r11)
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stwu r31, 4(r11)
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stfdu f14, 8(r11)
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stfdu f15, 8(r11)
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stfdu f16, 8(r11)
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stfdu f17, 8(r11)
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stfdu f18, 8(r11)
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stfdu f19, 8(r11)
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stfdu f20, 8(r11)
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stfdu f21, 8(r11)
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stfdu f22, 8(r11)
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stfdu f23, 8(r11)
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stfdu f24, 8(r11)
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stfdu f25, 8(r11)
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stfdu f26, 8(r11)
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stfdu f27, 8(r11)
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stfdu f28, 8(r11)
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stfdu f29, 8(r11)
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stfdu f30, 8(r11)
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stfdu f31, 8(r11)
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/* Set up a callback link */
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addi r1, r1, -16
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Loadglobal r9, _caml_bottom_of_stack, r11
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Loadglobal r10, _caml_last_return_address, r11
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Loadglobal r11, _caml_gc_regs, r11
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stw r9, 0(r1)
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stw r10, 4(r1)
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stw r11, 8(r1)
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/* Build an exception handler to catch exceptions escaping out of Caml */
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bl L103
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b L104
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L103:
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addi r1, r1, -16
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mflr r0
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stw r0, 0(r1)
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Loadglobal r11, _caml_exception_pointer, r11
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stw r11, 4(r1)
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mr r29, r1
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/* Reload allocation pointers */
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Loadglobal r31, _caml_young_ptr, r11
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Loadglobal r30, _caml_young_limit, r11
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/* Say we are back into Caml code */
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li r0, 0
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Storeglobal r0, _caml_last_return_address, r11
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/* Call the Caml code */
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mtctr r12
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L105:
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bctrl
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/* Pop the trap frame, restoring caml_exception_pointer */
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lwz r9, 4(r1)
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Storeglobal r9, _caml_exception_pointer, r11
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addi r1, r1, 16
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/* Pop the callback link, restoring the global variables */
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L106:
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lwz r9, 0(r1)
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lwz r10, 4(r1)
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lwz r11, 8(r1)
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Storeglobal r9, _caml_bottom_of_stack, r12
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Storeglobal r10, _caml_last_return_address, r12
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Storeglobal r11, _caml_gc_regs, r12
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addi r1, r1, 16
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/* Update allocation pointer */
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Storeglobal r31, _caml_young_ptr, r11
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/* Restore callee-save registers */
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addi r11, r1, 16-4
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lwzu r14, 4(r11)
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lwzu r15, 4(r11)
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lwzu r16, 4(r11)
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lwzu r17, 4(r11)
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lwzu r18, 4(r11)
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lwzu r19, 4(r11)
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lwzu r20, 4(r11)
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lwzu r21, 4(r11)
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lwzu r22, 4(r11)
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lwzu r23, 4(r11)
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lwzu r24, 4(r11)
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lwzu r25, 4(r11)
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lwzu r26, 4(r11)
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lwzu r27, 4(r11)
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lwzu r28, 4(r11)
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lwzu r29, 4(r11)
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lwzu r30, 4(r11)
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lwzu r31, 4(r11)
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lfdu f14, 8(r11)
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lfdu f15, 8(r11)
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lfdu f16, 8(r11)
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lfdu f17, 8(r11)
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lfdu f18, 8(r11)
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lfdu f19, 8(r11)
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lfdu f20, 8(r11)
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lfdu f21, 8(r11)
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lfdu f22, 8(r11)
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lfdu f23, 8(r11)
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lfdu f24, 8(r11)
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lfdu f25, 8(r11)
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lfdu f26, 8(r11)
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lfdu f27, 8(r11)
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lfdu f28, 8(r11)
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lfdu f29, 8(r11)
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lfdu f30, 8(r11)
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lfdu f31, 8(r11)
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/* Reload return address */
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lwz r0, 256+4(r1)
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mtlr r0
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/* Return */
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addi r1, r1, 256
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blr
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/* The trap handler: */
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L104:
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/* Update caml_exception_pointer */
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Storeglobal r29, _caml_exception_pointer, r11
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/* Encode exception bucket as an exception result and return it */
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ori r3, r3, 2
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b L106
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/* Callback from C to Caml */
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.globl _caml_callback_exn
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_caml_callback_exn:
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/* Initial shuffling of arguments */
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mr r0, r3 /* Closure */
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mr r3, r4 /* Argument */
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mr r4, r0
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lwz r12, 0(r4) /* Code pointer */
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b L102
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.globl _caml_callback2_exn
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_caml_callback2_exn:
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mr r0, r3 /* Closure */
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mr r3, r4 /* First argument */
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mr r4, r5 /* Second argument */
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mr r5, r0
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Addrglobal r12, _caml_apply2
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b L102
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.globl _caml_callback3_exn
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_caml_callback3_exn:
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mr r0, r3 /* Closure */
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mr r3, r4 /* First argument */
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mr r4, r5 /* Second argument */
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mr r5, r6 /* Third argument */
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mr r6, r0
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Addrglobal r12, _caml_apply3
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b L102
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/* Frame table */
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.const
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.globl _caml_system__frametable
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_caml_system__frametable:
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.long 1 /* one descriptor */
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.long L105 + 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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