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/* -*- asm -*-
*
* Creation Date: <2001/01/28 20:33:22 samuel>
* Time-stamp: <2001/06/16 15:29:32 samuel>
*
* <molasm.h>
*
* Utility assembly macros
*
* Copyright (C) 2001 Samuel Rydh (samuel@ibrium.se)
*
* This program 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
*
*/
#ifndef _H_MOLASM
#define _H_MOLASM
/************************************************************************/
/* Vector entry point definitions */
/************************************************************************/
#define MOL_SPRG2_MAGIC 0x1779
/*
* This code uses the dynamic linkage/action symbol functionality of
* the MOL kernel loader to automatically install the hooks.
* Refer to init.c for the actual implementation.
*/
#define VECTOR_HOOK( v ) \
.long Action_RELOC_HOOK ;\
.long v ;\
.long vhook_end_##v - vhook_##v ;\
.long vret_##v - vhook_##v ;\
vhook_##v: ;\
mtsprg0 r3 ;\
addis r3,0,0 /* [1] hook address inserted */ ;\
mtsprg1 r1 ;\
ori r3,r3,0 /* [3] at module initialization */ ;\
mflr r1 ;\
mtlr r3 ;\
blr ;\
;\
vret_##v: ;\
nop /* overwritten instruction is inserted here */ ;\
ba v + 0x4 ;\
vhook_end_##v: ;
/* SPRG0,1 = saved r3,r1, r1 = saved lr */
#define VECTOR_(v, dummy_str, secondary, not_mol_label ) \
/* not mol return */ ;\
716: mtcr r3 ;\
mfsprg1 r1 ;\
mfsprg0 r3 ;\
717: ; continue_trap_##v: ;\
.long Action_VRET + v /* ba vret_xxx */ ;\
;\
/* secondary interrupt */ ;\
718: li r3,v ;\
b secondary ;\
;\
VECTOR_HOOK( v ) ;\
;\
/* entrypoint */ ;\
mtlr r1 ;\
mfcr r3 ;\
mfsprg2 r1 ;\
cmpwi r1,MOL_SPRG2_MAGIC ;\
bne- not_mol_label ;\
soft_603_entry_##v: ;\
mfsrr1 r1 ;\
rlwinm. r1,r1,0,17,17 /* MSR_PR set? */ ;\
mfsprg3 r1 ;\
beq- 718b /* if not, take a secondary trap? */ ;
#define VECTOR(v, dummy_str, secondary) VECTOR_(v, dummy_str, secondary, 716b )
#define TAKE_EXCEPTION_( v ) \
bl take_exception ;\
.long Action_VRET + v ;
#define TAKE_EXCEPTION \
bl take_exception ;\
b 717b
/************************************************************************/
/* 603 vector HOOKs (r0-r3, cr0 saved by hardware) */
/************************************************************************/
#define VECTOR_HOOK_603( v ) \
.long Action_RELOC_HOOK ;\
.long v ;\
.long vhook_end_##v - vhook_##v ;\
.long vret_##v - vhook_##v ;\
vhook_##v: ;\
mfsprg2 r1 ;\
addis r3,0,0 /* [1] hook address inserted */ ;\
cmpwi r1,MOL_SPRG2_MAGIC ;\
ori r3,r3,0 /* [3] at module initialization */ ;\
bne vret_##v ;\
mfctr r0 ;\
mtctr r3 ;\
bctr ;\
;\
vret_##v: ;\
nop /* overwritten instruction is inserted here */ ;\
ba v + 0x4 ;\
vhook_end_##v: ;
/* r0 = saved ctr */
#define VECTOR_603(v, dummy_str ) \
VECTOR_HOOK_603( v ) ;\
/* entrypoint goes here */ ;
/* all register are assumed unmodified here */
#define SOFT_VECTOR_ENTRY_603( v ) \
mtsprg0 r3 ;\
mtsprg1 r1 ;\
mfcr r3 ;\
b soft_603_entry_##v ;
/************************************************************************/
/* FUNCTION_HOOK */
/************************************************************************/
#define FHOOK( symind ) \
.long Action_HOOK_FUNCTION ;\
.long symind ;\
.long fhook_end_##symind - fhook_##symind ;\
.long fret_##symind - fhook_##symind ;\
fhook_##symind: ;\
mflr r10 ;\
addis r9,0,0 /* [1] address inserted */ ;\
ori r9,r9,0 /* [2] at runtime */ ;\
mtctr r9 ;\
bctrl ;\
mtlr r10 ;\
fret_##symind: ;\
nop /* overwritten instruction is inserted here */ ;\
nop /* return (through a relative branch) */ ;\
fhook_end_##symind: ;
/************************************************************************/
/* Utility */
/************************************************************************/
.macro LOAD_VARIABLE reg, offs
lis \reg,(k_mol_stack + \offs)@ha
lwz \reg,(k_mol_stack + \offs)@l(\reg)
.endm
.macro SET_SESSION_TABLE reg
lis \reg,(k_session_table)@ha
addi \reg,\reg,(k_session_table)@l
.endm
/************************************************************************/
/* GPR save / restore */
/************************************************************************/
.macro xGPR_SAVE p0=-1,p1=-1,p2=-1,p3=-1,p4=-1,p5=-1,p6=-1,p7=-1,p8=-1,p9=-1
.if \p0+1
stw \p0,xGPR0+\p0*4(r1)
xGPR_SAVE \p1,\p2,\p3,\p4,\p5,\p6,\p8,\p8,\p9
.endif
.endm
.macro xGPR_LOAD p0=-1,p1=-1,p2=-1,p3=-1,p4=-1,p5=-1,p6=-1,p7=-1,p8=-1,p9=-1
.if \p0+1
lwz \p0,xGPR0+\p0*4(r1)
xGPR_LOAD \p1,\p2,\p3,\p4,\p5,\p6,\p8,\p8,\p9
.endif
.endm
/************************************************************************/
/* FPU misc */
/************************************************************************/
.macro ENABLE_MSR_FP scr
mfmsr \scr
ori \scr,\scr,MSR_FP
mtmsr \scr
isync
.endm
/************************************************************************/
/* Segment registers */
/************************************************************************/
.macro LOAD_SEGMENT_REGS base, scr, scr2, ind=0
.if \ind - 16
lwz \scr,(\ind * 4)(\base)
lwz \scr2,((\ind+1) * 4)(\base)
mtsr \ind,\scr
mtsr \ind+1,\scr2
LOAD_SEGMENT_REGS \base, \scr2, \scr, (\ind+2)
.endif
.endm
.macro SAVE_SEGMENT_REGS base, scr, scr2, ind=0
.if \ind - 16
mfsr \scr,\ind
mfsr \scr2,\ind+1
stw \scr,(\ind * 4)(\base)
stw \scr2,((\ind+1) * 4)(\base)
SAVE_SEGMENT_REGS \base, \scr, \scr2, (\ind+2)
.endif
.endm
/************************************************************************/
/* BAT register */
/************************************************************************/
.macro SAVE_DBATS varoffs, scr1
mfpvr \scr1
srwi \scr1,\scr1,16
cmpwi r3,1
beq 33f
.irp nn,0,1,2,3,4,5,6,7
mfspr \scr1, SPRN_DBAT0U + \nn
stw \scr1,\varoffs + (4*\nn)(r1)
.endr
33:
.endm
.macro SAVE_IBATS varoffs, scr1
.irp nn,0,1,2,3,4,5,6,7
mfspr \scr1, SPRN_IBAT0U + \nn
stw \scr1,(\varoffs + (4*\nn))(r1)
.endr
.endm
/************************************************************************/
/* Physical/virtual conversion */
/************************************************************************/
/* replaced with lis dreg,addr@ha ; addi dreg,dreg,addr@l */
#define LI_PHYS( dreg, addr ) \
.long Action_LI_PHYS + dreg ;\
.long addr - r__reloctable_start
#define LI_VIRT( dreg, addr ) \
lis dreg,addr@ha ; \
addi dreg,dreg,addr@l
#define LI_PHYS_VARBASE( base ) \
LI_PHYS( base, k_variable_base )
#define LI_VIRT_VARBASE( base ) \
LI_VIRT( base, k_variable_base )
/************************************************************************/
/* D E B U G */
/************************************************************************/
.macro STOP_EMULATION val
stw r3,xDEBUG_SCR1(r1)
li r3,\val
stw r3,xKERNEL_DBG_STOP(r1)
li r3,1
stw r3,xINTERRUPT(r1)
lwz r3,xDEBUG_SCR1(r1)
.endm
.macro DEBUG_INC num, dummy=""
.if (\num >= 9 || \num<0)
.print "******* DEBUG_INC num out of range **********" ; .fail 1
.endif
stw r3,xDEBUG_SCR1(r1)
lwz r3,(xDEBUG0+4*\num)(r1)
addi r3,r3,1
stw r3,(xDEBUG0+4*\num)(r1)
lwz r3,xDEBUG_SCR1(r1)
.endm
.macro DEBUG_TRACE num, dummy=""
stw r3,xDEBUG_SCR1(r1)
lwz r3,xDEBUG_TRACE(r1)
addi r3,r3,1
stw r3,xDEBUG_TRACE(r1)
stw r3,(xDEBUG0+4*\num)(r1)
lwz r3,xDEBUG_SCR1(r1)
.endm
.macro TRACE_VAL val, dummy=""
stw r30,xDEBUG_SCR1(r1)
stw r29,xDEBUG_SCR2(r1)
lwz r30,xDEBUG_TRACE(r1)
rlwinm r30,r30,0,24,31 // 256 entries
rlwinm r30,r30,2,22,29
addi r30,r30,xDBG_TRACE_SPACE
lis r29,(\val)@ha
addi r29,r29,(\val)@l
stwx r29,r30,r1
lwz r30,xDEBUG_TRACE(r1)
addi r30,r30,1
rlwinm r30,r30,0,24,31 // 256 entries
stw r30,xDEBUG_TRACE(r1)
lwz r29,xDEBUG_SCR2(r1)
lwz r30,xDEBUG_SCR1(r1)
.endm
#endif /* _H_MOLASM */
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