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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. */
/* */
/***********************************************************************/
/* $Id$ */
/* Asm part of the runtime system, Alpha processor */
/* Allocation */
.text
.globl caml_alloc2
.globl caml_alloc3
.globl caml_allocN
.globl caml_call_gc
/* Note: the profiling code sets $27 to the address of the "normal" entrypoint.
So don't pass parameters to those routines in $27. */
/* caml_alloc* : all code generator registers preserved,
$gp preserved, $27 not necessarily valid on entry */
.globl caml_alloc1
.ent caml_alloc1
.align 3
caml_alloc1:
.prologue 0
subq $13, 16, $13
cmpult $13, $14, $25
bne $25, $100
ret ($26)
$100: ldiq $25, 16
br $110
.end caml_alloc1
.globl caml_alloc2
.ent caml_alloc2
.align 3
caml_alloc2:
.prologue 0
subq $13, 24, $13
cmpult $13, $14, $25
bne $25, $101
ret ($26)
$101: ldiq $25, 24
br $110
.end caml_alloc2
.globl caml_alloc3
.ent caml_alloc3
.align 3
caml_alloc3:
.prologue 0
subq $13, 32, $13
cmpult $13, $14, $25
bne $25, $102
ret ($26)
$102: ldiq $25, 32
br $110
.end caml_alloc3
.globl caml_allocN
.ent caml_allocN
.align 3
caml_allocN:
.prologue 0
subq $13, $25, $13
.set noat
cmpult $13, $14, $at
bne $at, $110
.set at
ret ($26)
.end caml_allocN
.globl caml_call_gc
.ent caml_call_gc
.align 3
caml_call_gc:
.prologue 0
ldiq $25, 0
$110: lda $sp, -0x200($sp)
/* 0x200 = 32*8 (ints) + 32*8 (floats) */
stq $26, 0x1F8($sp) /* return address */
stq $gp, 0x1F0($sp) /* caller's $gp */
stq $25, 0x1E8($sp) /* desired size */
/* Rebuild $gp */
br $27, $103
$103: ldgp $gp, 0($27)
/* Record lowest stack address, return address, GC regs */
stq $26, caml_last_return_address
lda $24, 0x200($sp)
stq $24, caml_bottom_of_stack
lda $24, 0x100($sp)
stq $24, caml_gc_regs
/* Save current allocation pointer for debugging purposes */
$113: stq $13, caml_young_ptr
/* Save trap pointer in case an exception is raised (e.g. sighandler) */
stq $15, caml_exception_pointer
/* Save all integer regs used by the code generator in the context */
stq $0, 0 * 8 ($24)
stq $1, 1 * 8 ($24)
stq $2, 2 * 8 ($24)
stq $3, 3 * 8 ($24)
stq $4, 4 * 8 ($24)
stq $5, 5 * 8 ($24)
stq $6, 6 * 8 ($24)
stq $7, 7 * 8 ($24)
stq $8, 8 * 8 ($24)
stq $9, 9 * 8 ($24)
stq $10, 10 * 8 ($24)
stq $11, 11 * 8 ($24)
stq $12, 12 * 8 ($24)
stq $16, 16 * 8 ($24)
stq $17, 17 * 8 ($24)
stq $18, 18 * 8 ($24)
stq $19, 19 * 8 ($24)
stq $20, 20 * 8 ($24)
stq $21, 21 * 8 ($24)
stq $22, 22 * 8 ($24)
/* Save all float regs that are not callee-save on the stack */
stt $f0, 0 * 8 ($sp)
stt $f1, 1 * 8 ($sp)
stt $f10, 10 * 8 ($sp)
stt $f11, 11 * 8 ($sp)
stt $f12, 12 * 8 ($sp)
stt $f13, 13 * 8 ($sp)
stt $f14, 14 * 8 ($sp)
stt $f15, 15 * 8 ($sp)
stt $f16, 16 * 8 ($sp)
stt $f17, 17 * 8 ($sp)
stt $f18, 18 * 8 ($sp)
stt $f19, 19 * 8 ($sp)
stt $f20, 20 * 8 ($sp)
stt $f21, 21 * 8 ($sp)
stt $f22, 22 * 8 ($sp)
stt $f23, 23 * 8 ($sp)
stt $f24, 24 * 8 ($sp)
stt $f25, 25 * 8 ($sp)
stt $f26, 26 * 8 ($sp)
stt $f27, 27 * 8 ($sp)
stt $f29, 29 * 8 ($sp)
stt $f30, 30 * 8 ($sp)
/* Call the garbage collector */
jsr caml_garbage_collection
ldgp $gp, 0($26)
/* Restore all regs used by the code generator */
lda $24, 0x100($sp)
ldq $0, 0 * 8 ($24)
ldq $1, 1 * 8 ($24)
ldq $2, 2 * 8 ($24)
ldq $3, 3 * 8 ($24)
ldq $4, 4 * 8 ($24)
ldq $5, 5 * 8 ($24)
ldq $6, 6 * 8 ($24)
ldq $7, 7 * 8 ($24)
ldq $8, 8 * 8 ($24)
ldq $9, 9 * 8 ($24)
ldq $10, 10 * 8 ($24)
ldq $11, 11 * 8 ($24)
ldq $12, 12 * 8 ($24)
ldq $16, 16 * 8 ($24)
ldq $17, 17 * 8 ($24)
ldq $18, 18 * 8 ($24)
ldq $19, 19 * 8 ($24)
ldq $20, 20 * 8 ($24)
ldq $21, 21 * 8 ($24)
ldq $22, 22 * 8 ($24)
ldt $f0, 0 * 8 ($sp)
ldt $f1, 1 * 8 ($sp)
ldt $f10, 10 * 8 ($sp)
ldt $f11, 11 * 8 ($sp)
ldt $f12, 12 * 8 ($sp)
ldt $f13, 13 * 8 ($sp)
ldt $f14, 14 * 8 ($sp)
ldt $f15, 15 * 8 ($sp)
ldt $f16, 16 * 8 ($sp)
ldt $f17, 17 * 8 ($sp)
ldt $f18, 18 * 8 ($sp)
ldt $f19, 19 * 8 ($sp)
ldt $f20, 20 * 8 ($sp)
ldt $f21, 21 * 8 ($sp)
ldt $f22, 22 * 8 ($sp)
ldt $f23, 23 * 8 ($sp)
ldt $f24, 24 * 8 ($sp)
ldt $f25, 25 * 8 ($sp)
ldt $f26, 26 * 8 ($sp)
ldt $f27, 27 * 8 ($sp)
ldt $f29, 29 * 8 ($sp)
ldt $f30, 30 * 8 ($sp)
/* Reload new allocation pointer and allocation limit */
ldq $13, caml_young_ptr
ldq $14, caml_young_limit
/* Allocate space for the block */
ldq $25, 0x1E8($sp)
subq $13, $25, $13
cmpult $13, $14, $25 /* Check that we have enough free space */
bne $25, $113 /* If not, call GC again */
/* Say that we are back into Caml code */
stq $31, caml_last_return_address
/* Return to caller */
ldq $26, 0x1F8($sp)
ldq $gp, 0x1F0($sp)
lda $sp, 0x200($sp)
ret ($26)
.end caml_call_gc
/* Call a C function from Caml */
/* Function to call is in $25 */
.globl caml_c_call
.ent caml_c_call
.align 3
caml_c_call:
.prologue 0
/* Preserve return address and caller's $gp in callee-save registers */
mov $26, $9
mov $gp, $10
/* Rebuild $gp */
br $27, $104
$104: ldgp $gp, 0($27)
/* Record lowest stack address and return address */
lda $11, caml_last_return_address
stq $26, 0($11)
stq $sp, caml_bottom_of_stack
/* Make the exception handler and alloc ptr available to the C code */
lda $12, caml_young_ptr
stq $13, 0($12)
lda $14, caml_young_limit
stq $15, caml_exception_pointer
/* Call the function */
mov $25, $27
jsr ($25)
/* Reload alloc ptr and alloc limit */
ldq $13, 0($12) /* $12 still points to caml_young_ptr */
ldq $14, 0($14) /* $14 still points to caml_young_limit */
/* Say that we are back into Caml code */
stq $31, 0($11) /* $11 still points to caml_last_return_address */
/* Restore $gp */
mov $10, $gp
/* Return */
ret ($9)
.end caml_c_call
/* Start the Caml program */
.globl caml_start_program
.ent caml_start_program
.align 3
caml_start_program:
ldgp $gp, 0($27)
lda $25, caml_program
/* Code shared with caml_callback* */
$107:
/* Save return address */
lda $sp, -128($sp)
stq $26, 0($sp)
/* Save all callee-save registers */
stq $9, 8($sp)
stq $10, 16($sp)
stq $11, 24($sp)
stq $12, 32($sp)
stq $13, 40($sp)
stq $14, 48($sp)
stq $15, 56($sp)
stt $f2, 64($sp)
stt $f3, 72($sp)
stt $f4, 80($sp)
stt $f5, 88($sp)
stt $f6, 96($sp)
stt $f7, 104($sp)
stt $f8, 112($sp)
stt $f9, 120($sp)
/* Set up a callback link on the stack. */
lda $sp, -32($sp)
ldq $0, caml_bottom_of_stack
stq $0, 0($sp)
ldq $1, caml_last_return_address
stq $1, 8($sp)
ldq $1, caml_gc_regs
stq $1, 16($sp)
/* Set up a trap frame to catch exceptions escaping the Caml code */
lda $sp, -16($sp)
ldq $15, caml_exception_pointer
stq $15, 0($sp)
lda $0, $109
stq $0, 8($sp)
mov $sp, $15
/* Reload allocation pointers */
ldq $13, caml_young_ptr
ldq $14, caml_young_limit
/* We are back into Caml code */
stq $31, caml_last_return_address
/* Call the Caml code */
mov $25, $27
$108: jsr ($25)
/* Reload $gp, masking off low bit in retaddr (might have been marked) */
bic $26, 1, $26
ldgp $gp, 4($26)
/* Pop the trap frame, restoring caml_exception_pointer */
ldq $15, 0($sp)
stq $15, caml_exception_pointer
lda $sp, 16($sp)
/* Pop the callback link, restoring the global variables */
$112: ldq $24, 0($sp)
stq $24, caml_bottom_of_stack
ldq $25, 8($sp)
stq $25, caml_last_return_address
ldq $24, 16($sp)
stq $24, caml_gc_regs
lda $sp, 32($sp)
/* Update allocation pointer */
stq $13, caml_young_ptr
/* Reload callee-save registers */
ldq $9, 8($sp)
ldq $10, 16($sp)
ldq $11, 24($sp)
ldq $12, 32($sp)
ldq $13, 40($sp)
ldq $14, 48($sp)
ldq $15, 56($sp)
ldt $f2, 64($sp)
ldt $f3, 72($sp)
ldt $f4, 80($sp)
ldt $f5, 88($sp)
ldt $f6, 96($sp)
ldt $f7, 104($sp)
ldt $f8, 112($sp)
ldt $f9, 120($sp)
/* Return to caller */
ldq $26, 0($sp)
lda $sp, 128($sp)
ret ($26)
/* The trap handler */
$109: ldgp $gp, 0($26)
/* Save exception pointer */
stq $15, caml_exception_pointer
/* Encode exception bucket as an exception result */
or $0, 2, $0
/* Return it */
br $112
.end caml_start_program
/* Raise an exception from C */
.globl caml_raise_exception
.ent caml_raise_exception
.align 3
caml_raise_exception:
ldgp $gp, 0($27)
mov $16, $0 /* Move exn bucket */
ldq $13, caml_young_ptr
ldq $14, caml_young_limit
stq $31, caml_last_return_address /* We're back into Caml */
ldq $sp, caml_exception_pointer
ldq $15, 0($sp)
ldq $26, 8($sp)
lda $sp, 16($sp)
jmp $25, ($26) /* Keep retaddr in $25 to help debugging */
.end caml_raise_exception
/* Callback from C to Caml */
.globl caml_callback_exn
.ent caml_callback_exn
.align 3
caml_callback_exn:
/* Initial shuffling of arguments */
ldgp $gp, 0($27)
mov $16, $25
mov $17, $16 /* first arg */
mov $25, $17 /* environment */
ldq $25, 0($25) /* code pointer */
br $107
.end caml_callback_exn
.globl caml_callback2_exn
.ent caml_callback2_exn
.align 3
caml_callback2_exn:
ldgp $gp, 0($27)
mov $16, $25
mov $17, $16 /* first arg */
mov $18, $17 /* second arg */
mov $25, $18 /* environment */
lda $25, caml_apply2
br $107
.end caml_callback2_exn
.globl caml_callback3_exn
.ent caml_callback3_exn
.align 3
caml_callback3_exn:
ldgp $gp, 0($27)
mov $16, $25
mov $17, $16 /* first arg */
mov $18, $17 /* second arg */
mov $19, $18 /* third arg */
mov $25, $19 /* environment */
lda $25, caml_apply3
br $107
.end caml_callback3_exn
/* Glue code to call [caml_array_bound_error] */
.globl caml_ml_array_bound_error
.ent caml_ml_array_bound_error
.align 3
caml_ml_array_bound_error:
br $27, $111
$111: ldgp $gp, 0($27)
lda $25, caml_array_bound_error
br caml_c_call /* never returns */
.end caml_ml_array_bound_error
#if defined(SYS_digital)
.rdata
#else
.section .rodata
#endif
.globl caml_system__frametable
caml_system__frametable:
.quad 1 /* one descriptor */
.quad $108 + 4 /* return address into callback */
.word -1 /* negative frame size => use callback link */
.word 0 /* no roots here */
.align 3
|
