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/* GRT stack implementation for ppc.
Copyright (C) 2005 - 2014 Tristan Gingold.
GHDL is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
As a special exception, if other files instantiate generics from this
unit, or you link this unit with other files to produce an executable,
this unit does not by itself cause the resulting executable to be
covered by the GNU General Public License. This exception does not
however invalidate any other reasons why the executable file might be
covered by the GNU Public License.
*/
.file "ppc.S"
.section ".text"
#define OFF 240
#define GREG(x) x
#define FREG(x) x
#define r0 GREG(0)
#define r1 GREG(1)
#define r2 GREG(2)
#define r3 GREG(3)
#define r4 GREG(4)
#define r5 GREG(5)
#define r6 GREG(6)
#define r7 GREG(7)
#define r8 GREG(8)
#define r9 GREG(9)
#define r10 GREG(10)
#define r11 GREG(11)
#define r12 GREG(12)
#define r13 GREG(13)
#define r14 GREG(14)
#define r15 GREG(15)
#define r16 GREG(16)
#define r17 GREG(17)
#define r18 GREG(18)
#define r19 GREG(19)
#define r20 GREG(20)
#define r21 GREG(21)
#define r22 GREG(22)
#define r23 GREG(23)
#define r24 GREG(24)
#define r25 GREG(25)
#define r26 GREG(26)
#define r27 GREG(27)
#define r28 GREG(28)
#define r29 GREG(29)
#define r30 GREG(30)
#define r31 GREG(31)
#define f0 FREG(0)
#define f1 FREG(1)
#define f2 FREG(2)
#define f3 FREG(3)
#define f4 FREG(4)
#define f5 FREG(5)
#define f6 FREG(6)
#define f7 FREG(7)
#define f8 FREG(8)
#define f9 FREG(9)
#define f10 FREG(10)
#define f11 FREG(11)
#define f12 FREG(12)
#define f13 FREG(13)
#define f14 FREG(14)
#define f15 FREG(15)
#define f16 FREG(16)
#define f17 FREG(17)
#define f18 FREG(18)
#define f19 FREG(19)
#define f20 FREG(20)
#define f21 FREG(21)
#define f22 FREG(22)
#define f23 FREG(23)
#define f24 FREG(24)
#define f25 FREG(25)
#define f26 FREG(26)
#define f27 FREG(27)
#define f28 FREG(28)
#define f29 FREG(29)
#define f30 FREG(30)
#define f31 FREG(31)
/* Stack structure is:
+4 : cur_length \ Stack
+0 : cur_sp / Context
-4 : arg
-8 : func
-12: pad
-16: pad
-20: LR save word
-24: Back chain
-28: fp/gp saved registers.
-4 : return address
-8 : process function to be executed
-12: function argument
...
-72: %sp
*/
/* Function called to loop on the process. */
.align 4
.type grt_stack_loop,@function
grt_stack_loop:
/* Get function. */
lwz r0,16(r1)
/* Get argument. */
lwz r3,20(r1)
mtlr r0
blrl
b grt_stack_loop
.size grt_stack_loop, . - grt_stack_loop
/* function Stack_Create (Func : Address; Arg : Address)
return Stack_Type; */
.align 4
.global grt_stack_create
.type grt_stack_create,@function
grt_stack_create:
/* Standard prologue. */
stwu r1,-32(r1)
mflr r0
stw r0,36(r1)
/* Save arguments. */
stw r3,24(r1)
stw r4,28(r1)
/* Allocate the stack, and exit in case of failure */
bl grt_stack_allocate
cmpwi 0,r3,0
beq- .Ldone
/* Note: r3 contains the address of the stack_context. This is
also the top of the stack. */
/* Prepare stack. */
/* Align the stack. */
addi r5,r3,-24
/* Save the parameters. */
lwz r6,24(r1)
stw r6,16(r5)
lwz r7,28(r1)
stw r7,20(r5)
/* The return function. */
lis r4,grt_stack_loop@ha
la r4,grt_stack_loop@l(r4)
stw r4,4(r5)
/* Back-Chain. */
addi r4,r1,32
stw r4,0(r5)
/* Save register.
They should be considered as garbage. */
addi r4,r5,-OFF
stfd f31,(OFF - 8)(r4)
stfd f30,(OFF - 16)(r4)
stfd f29,(OFF - 24)(r4)
stfd f28,(OFF - 32)(r4)
stfd f27,(OFF - 40)(r4)
stfd f26,(OFF - 48)(r4)
stfd f25,(OFF - 56)(r4)
stfd f24,(OFF - 64)(r4)
stfd f23,(OFF - 72)(r4)
stfd f22,(OFF - 80)(r4)
stfd f21,(OFF - 88)(r4)
stfd f20,(OFF - 96)(r4)
stfd f19,(OFF - 104)(r4)
stfd f18,(OFF - 112)(r4)
stfd f17,(OFF - 120)(r4)
stfd f16,(OFF - 128)(r4)
stfd f15,(OFF - 136)(r4)
stfd f14,(OFF - 144)(r4)
stw r31,(OFF - 148)(r4)
stw r30,(OFF - 152)(r4)
stw r29,(OFF - 156)(r4)
stw r28,(OFF - 160)(r4)
stw r27,(OFF - 164)(r4)
stw r26,(OFF - 168)(r4)
stw r25,(OFF - 172)(r4)
stw r24,(OFF - 176)(r4)
stw r23,(OFF - 180)(r4)
stw r22,(OFF - 184)(r4)
stw r21,(OFF - 188)(r4)
stw r20,(OFF - 192)(r4)
stw r19,(OFF - 196)(r4)
stw r18,(OFF - 200)(r4)
stw r17,(OFF - 204)(r4)
stw r16,(OFF - 208)(r4)
stw r15,(OFF - 212)(r4)
stw r14,(OFF - 216)(r4)
mfcr r0
stw r0, (OFF - 220)(r4)
/* Save stack pointer. */
stw r4, 0(r3)
.Ldone:
lwz r0,36(r1)
mtlr r0
addi r1,r1,32
blr
.size grt_stack_create,. - grt_stack_create
.align 4
.global grt_stack_switch
/* Arguments: TO, FROM.
Both are pointers to a stack_context. */
.type grt_stack_switch,@function
grt_stack_switch:
/* Standard prologue, save return address. */
stwu r1,(-OFF)(r1)
mflr r0
stw r0,(OFF + 4)(r1)
/* Save r14-r31, f14-f31, CR
This is 18 words + 18 double words, ie 216 bytes. */
/* Maybe use the savefpr function ? */
stfd f31,(OFF - 8)(r1)
stfd f30,(OFF - 16)(r1)
stfd f29,(OFF - 24)(r1)
stfd f28,(OFF - 32)(r1)
stfd f27,(OFF - 40)(r1)
stfd f26,(OFF - 48)(r1)
stfd f25,(OFF - 56)(r1)
stfd f24,(OFF - 64)(r1)
stfd f23,(OFF - 72)(r1)
stfd f22,(OFF - 80)(r1)
stfd f21,(OFF - 88)(r1)
stfd f20,(OFF - 96)(r1)
stfd f19,(OFF - 104)(r1)
stfd f18,(OFF - 112)(r1)
stfd f17,(OFF - 120)(r1)
stfd f16,(OFF - 128)(r1)
stfd f15,(OFF - 136)(r1)
stfd f14,(OFF - 144)(r1)
stw r31,(OFF - 148)(r1)
stw r30,(OFF - 152)(r1)
stw r29,(OFF - 156)(r1)
stw r28,(OFF - 160)(r1)
stw r27,(OFF - 164)(r1)
stw r26,(OFF - 168)(r1)
stw r25,(OFF - 172)(r1)
stw r24,(OFF - 176)(r1)
stw r23,(OFF - 180)(r1)
stw r22,(OFF - 184)(r1)
stw r21,(OFF - 188)(r1)
stw r20,(OFF - 192)(r1)
stw r19,(OFF - 196)(r1)
stw r18,(OFF - 200)(r1)
stw r17,(OFF - 204)(r1)
stw r16,(OFF - 208)(r1)
stw r15,(OFF - 212)(r1)
stw r14,(OFF - 216)(r1)
mfcr r0
stw r0, (OFF - 220)(r1)
/* Save stack pointer. */
stw r1, 0(r4)
/* Load stack pointer. */
lwz r1, 0(r3)
lfd f31,(OFF - 8)(r1)
lfd f30,(OFF - 16)(r1)
lfd f29,(OFF - 24)(r1)
lfd f28,(OFF - 32)(r1)
lfd f27,(OFF - 40)(r1)
lfd f26,(OFF - 48)(r1)
lfd f25,(OFF - 56)(r1)
lfd f24,(OFF - 64)(r1)
lfd f23,(OFF - 72)(r1)
lfd f22,(OFF - 80)(r1)
lfd f21,(OFF - 88)(r1)
lfd f20,(OFF - 96)(r1)
lfd f19,(OFF - 104)(r1)
lfd f18,(OFF - 112)(r1)
lfd f17,(OFF - 120)(r1)
lfd f16,(OFF - 128)(r1)
lfd f15,(OFF - 136)(r1)
lfd f14,(OFF - 144)(r1)
lwz r31,(OFF - 148)(r1)
lwz r30,(OFF - 152)(r1)
lwz r29,(OFF - 156)(r1)
lwz r28,(OFF - 160)(r1)
lwz r27,(OFF - 164)(r1)
lwz r26,(OFF - 168)(r1)
lwz r25,(OFF - 172)(r1)
lwz r24,(OFF - 176)(r1)
lwz r23,(OFF - 180)(r1)
lwz r22,(OFF - 184)(r1)
lwz r21,(OFF - 188)(r1)
lwz r20,(OFF - 192)(r1)
lwz r19,(OFF - 196)(r1)
lwz r18,(OFF - 200)(r1)
lwz r17,(OFF - 204)(r1)
lwz r16,(OFF - 208)(r1)
lwz r15,(OFF - 212)(r1)
lwz r14,(OFF - 216)(r1)
lwz r0, (OFF - 220)(r1)
mtcr r0
lwz r0,(OFF + 4)(r1)
mtlr r0
addi r1,r1,OFF
blr
.size grt_stack_switch, . - grt_stack_switch
.ident "Written by T.Gingold"
|
