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power-elf.S
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power-elf.S
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/*********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/*********************************************************************/
/* $Id$ */
#define Addrglobal(reg,glob) \
addis reg, 0, glob@ha; \
addi reg, reg, glob@l
#define Loadglobal(reg,glob,tmp) \
addis tmp, 0, glob@ha; \
lwz reg, glob@l(tmp)
#define Storeglobal(reg,glob,tmp) \
addis tmp, 0, glob@ha; \
stw reg, glob@l(tmp)
.section ".text"
/* Invoke the garbage collector. */
.globl caml_call_gc
.type caml_call_gc, @function
caml_call_gc:
/* Set up stack frame */
stwu 1, -0x1A0(1)
/* 0x1A0 = 4*32 (int regs) + 8*32 (float regs) + 32 (space for C call) */
/* Record return address into Caml code */
mflr 0
Storeglobal(0, caml_last_return_address, 11)
/* Record lowest stack address */
addi 0, 1, 0x1A0
Storeglobal(0, caml_bottom_of_stack, 11)
/* Record pointer to register array */
addi 0, 1, 8*32 + 32
Storeglobal(0, caml_gc_regs, 11)
/* Save current allocation pointer for debugging purposes */
Storeglobal(31, caml_young_ptr, 11)
/* Save exception pointer (if e.g. a sighandler raises) */
Storeglobal(29, caml_exception_pointer, 11)
/* Save all registers used by the code generator */
addi 11, 1, 8*32 + 32 - 4
stwu 3, 4(11)
stwu 4, 4(11)
stwu 5, 4(11)
stwu 6, 4(11)
stwu 7, 4(11)
stwu 8, 4(11)
stwu 9, 4(11)
stwu 10, 4(11)
stwu 14, 4(11)
stwu 15, 4(11)
stwu 16, 4(11)
stwu 17, 4(11)
stwu 18, 4(11)
stwu 19, 4(11)
stwu 20, 4(11)
stwu 21, 4(11)
stwu 22, 4(11)
stwu 23, 4(11)
stwu 24, 4(11)
stwu 25, 4(11)
stwu 26, 4(11)
stwu 27, 4(11)
stwu 28, 4(11)
addi 11, 1, 32 - 8
stfdu 1, 8(11)
stfdu 2, 8(11)
stfdu 3, 8(11)
stfdu 4, 8(11)
stfdu 5, 8(11)
stfdu 6, 8(11)
stfdu 7, 8(11)
stfdu 8, 8(11)
stfdu 9, 8(11)
stfdu 10, 8(11)
stfdu 11, 8(11)
stfdu 12, 8(11)
stfdu 13, 8(11)
stfdu 14, 8(11)
stfdu 15, 8(11)
stfdu 16, 8(11)
stfdu 17, 8(11)
stfdu 18, 8(11)
stfdu 19, 8(11)
stfdu 20, 8(11)
stfdu 21, 8(11)
stfdu 22, 8(11)
stfdu 23, 8(11)
stfdu 24, 8(11)
stfdu 25, 8(11)
stfdu 26, 8(11)
stfdu 27, 8(11)
stfdu 28, 8(11)
stfdu 29, 8(11)
stfdu 30, 8(11)
stfdu 31, 8(11)
/* Call the GC */
bl caml_garbage_collection
/* Reload new allocation pointer and allocation limit */
Loadglobal(31, caml_young_ptr, 11)
Loadglobal(30, caml_young_limit, 11)
/* Restore all regs used by the code generator */
addi 11, 1, 8*32 + 32 - 4
lwzu 3, 4(11)
lwzu 4, 4(11)
lwzu 5, 4(11)
lwzu 6, 4(11)
lwzu 7, 4(11)
lwzu 8, 4(11)
lwzu 9, 4(11)
lwzu 10, 4(11)
lwzu 14, 4(11)
lwzu 15, 4(11)
lwzu 16, 4(11)
lwzu 17, 4(11)
lwzu 18, 4(11)
lwzu 19, 4(11)
lwzu 20, 4(11)
lwzu 21, 4(11)
lwzu 22, 4(11)
lwzu 23, 4(11)
lwzu 24, 4(11)
lwzu 25, 4(11)
lwzu 26, 4(11)
lwzu 27, 4(11)
lwzu 28, 4(11)
addi 11, 1, 32 - 8
lfdu 1, 8(11)
lfdu 2, 8(11)
lfdu 3, 8(11)
lfdu 4, 8(11)
lfdu 5, 8(11)
lfdu 6, 8(11)
lfdu 7, 8(11)
lfdu 8, 8(11)
lfdu 9, 8(11)
lfdu 10, 8(11)
lfdu 11, 8(11)
lfdu 12, 8(11)
lfdu 13, 8(11)
lfdu 14, 8(11)
lfdu 15, 8(11)
lfdu 16, 8(11)
lfdu 17, 8(11)
lfdu 18, 8(11)
lfdu 19, 8(11)
lfdu 20, 8(11)
lfdu 21, 8(11)
lfdu 22, 8(11)
lfdu 23, 8(11)
lfdu 24, 8(11)
lfdu 25, 8(11)
lfdu 26, 8(11)
lfdu 27, 8(11)
lfdu 28, 8(11)
lfdu 29, 8(11)
lfdu 30, 8(11)
lfdu 31, 8(11)
/* Return to caller, restarting the allocation */
Loadglobal(0, caml_last_return_address, 11)
addic 0, 0, -16 /* Restart the allocation (4 instructions) */
mtlr 0
/* Say we are back into Caml code */
li 12, 0
Storeglobal(12, caml_last_return_address, 11)
/* Deallocate stack frame */
addi 1, 1, 0x1A0
/* Return */
blr
/* Call a C function from Caml */
.globl caml_c_call
.type caml_c_call, @function
caml_c_call:
/* Save return address */
mflr 25
/* Get ready to call C function (address in 11) */
mtlr 11
/* Record lowest stack address and return address */
Storeglobal(1, caml_bottom_of_stack, 12)
Storeglobal(25, caml_last_return_address, 12)
/* Make the exception handler and alloc ptr available to the C code */
Storeglobal(31, caml_young_ptr, 11)
Storeglobal(29, caml_exception_pointer, 11)
/* Call the function (address in link register) */
blrl
/* Restore return address (in 25, preserved by the C function) */
mtlr 25
/* Reload allocation pointer and allocation limit*/
Loadglobal(31, caml_young_ptr, 11)
Loadglobal(30, caml_young_limit, 11)
/* Say we are back into Caml code */
li 12, 0
Storeglobal(12, caml_last_return_address, 11)
/* Return to caller */
blr
/* Raise an exception from C */
.globl caml_raise_exception
.type caml_raise_exception, @function
caml_raise_exception:
/* Reload Caml global registers */
Loadglobal(1, caml_exception_pointer, 11)
Loadglobal(31, caml_young_ptr, 11)
Loadglobal(30, caml_young_limit, 11)
/* Say we are back into Caml code */
li 0, 0
Storeglobal(0, caml_last_return_address, 11)
/* Pop trap frame */
lwz 0, 0(1)
lwz 29, 4(1)
mtlr 0
addi 1, 1, 16
/* Branch to handler */
blr
/* Start the Caml program */
.globl caml_start_program
.type caml_start_program, @function
caml_start_program:
Addrglobal(12, caml_program)
/* Code shared between caml_start_program and caml_callback */
.L102:
/* Allocate and link stack frame */
stwu 1, -256(1)
/* Save return address */
mflr 0
stw 0, 256+4(1)
/* Save all callee-save registers */
/* GPR 14 at sp+16 ... GPR 31 at sp+84
FPR 14 at sp+92 ... FPR 31 at sp+228 */
addi 11, 1, 16-4
stwu 14, 4(11)
stwu 15, 4(11)
stwu 16, 4(11)
stwu 17, 4(11)
stwu 18, 4(11)
stwu 19, 4(11)
stwu 20, 4(11)
stwu 21, 4(11)
stwu 22, 4(11)
stwu 23, 4(11)
stwu 24, 4(11)
stwu 25, 4(11)
stwu 26, 4(11)
stwu 27, 4(11)
stwu 28, 4(11)
stwu 29, 4(11)
stwu 30, 4(11)
stwu 31, 4(11)
stfdu 14, 8(11)
stfdu 15, 8(11)
stfdu 16, 8(11)
stfdu 17, 8(11)
stfdu 18, 8(11)
stfdu 19, 8(11)
stfdu 20, 8(11)
stfdu 21, 8(11)
stfdu 22, 8(11)
stfdu 23, 8(11)
stfdu 24, 8(11)
stfdu 25, 8(11)
stfdu 26, 8(11)
stfdu 27, 8(11)
stfdu 28, 8(11)
stfdu 29, 8(11)
stfdu 30, 8(11)
stfdu 31, 8(11)
/* Set up a callback link */
addi 1, 1, -16
Loadglobal(9, caml_bottom_of_stack, 11)
Loadglobal(10, caml_last_return_address, 11)
Loadglobal(11, caml_gc_regs, 11)
stw 9, 0(1)
stw 10, 4(1)
stw 11, 8(1)
/* Build an exception handler to catch exceptions escaping out of Caml */
bl .L103
b .L104
.L103:
addi 1, 1, -16
mflr 0
stw 0, 0(1)
Loadglobal(11, caml_exception_pointer, 11)
stw 11, 4(1)
mr 29, 1
/* Reload allocation pointers */
Loadglobal(31, caml_young_ptr, 11)
Loadglobal(30, caml_young_limit, 11)
/* Say we are back into Caml code */
li 0, 0
Storeglobal(0, caml_last_return_address, 11)
/* Call the Caml code */
mtlr 12
.L105:
blrl
/* Pop the trap frame, restoring caml_exception_pointer */
lwz 9, 4(1)
Storeglobal(9, caml_exception_pointer, 11)
addi 1, 1, 16
/* Pop the callback link, restoring the global variables */
.L106:
lwz 9, 0(1)
lwz 10, 4(1)
lwz 11, 8(1)
Storeglobal(9, caml_bottom_of_stack, 12)
Storeglobal(10, caml_last_return_address, 12)
Storeglobal(11, caml_gc_regs, 12)
addi 1, 1, 16
/* Update allocation pointer */
Storeglobal(31, caml_young_ptr, 11)
/* Restore callee-save registers */
addi 11, 1, 16-4
lwzu 14, 4(11)
lwzu 15, 4(11)
lwzu 16, 4(11)
lwzu 17, 4(11)
lwzu 18, 4(11)
lwzu 19, 4(11)
lwzu 20, 4(11)
lwzu 21, 4(11)
lwzu 22, 4(11)
lwzu 23, 4(11)
lwzu 24, 4(11)
lwzu 25, 4(11)
lwzu 26, 4(11)
lwzu 27, 4(11)
lwzu 28, 4(11)
lwzu 29, 4(11)
lwzu 30, 4(11)
lwzu 31, 4(11)
lfdu 14, 8(11)
lfdu 15, 8(11)
lfdu 16, 8(11)
lfdu 17, 8(11)
lfdu 18, 8(11)
lfdu 19, 8(11)
lfdu 20, 8(11)
lfdu 21, 8(11)
lfdu 22, 8(11)
lfdu 23, 8(11)
lfdu 24, 8(11)
lfdu 25, 8(11)
lfdu 26, 8(11)
lfdu 27, 8(11)
lfdu 28, 8(11)
lfdu 29, 8(11)
lfdu 30, 8(11)
lfdu 31, 8(11)
/* Reload return address */
lwz 0, 256+4(1)
mtlr 0
/* Return */
addi 1, 1, 256
blr
/* The trap handler: */
.L104:
/* Update caml_exception_pointer */
Storeglobal(29, caml_exception_pointer, 11)
/* Encode exception bucket as an exception result and return it */
ori 3, 3, 2
b .L106
/* Callback from C to Caml */
.globl caml_callback_exn
.type caml_callback_exn, @function
caml_callback_exn:
/* Initial shuffling of arguments */
mr 0, 3 /* Closure */
mr 3, 4 /* Argument */
mr 4, 0
lwz 12, 0(4) /* Code pointer */
b .L102
.globl caml_callback2_exn
.type caml_callback2_exn, @function
caml_callback2_exn:
mr 0, 3 /* Closure */
mr 3, 4 /* First argument */
mr 4, 5 /* Second argument */
mr 5, 0
Addrglobal(12, caml_apply2)
b .L102
.globl caml_callback3_exn
.type caml_callback3_exn, @function
caml_callback3_exn:
mr 0, 3 /* Closure */
mr 3, 4 /* First argument */
mr 4, 5 /* Second argument */
mr 5, 6 /* Third argument */
mr 6, 0
Addrglobal(12, caml_apply3)
b .L102
/* Frame table */
.section ".data"
.globl caml_system__frametable
.type caml_system__frametable, @object
caml_system__frametable:
.long 1 /* one descriptor */
.long .L105 + 4 /* return address into callback */
.short -1 /* negative size count => use callback link */
.short 0 /* no roots here */