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/* Jump to a new context.
Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#define __ASSEMBLY__
#include <asm/ptrace.h>
#include "ucontext_i.h"
ENTRY(__setcontext)
mflr r0
stwu r1,-16(r1)
stw r0,20(r1)
stw r31,12(r1)
mr r31,r3
/*
* If this ucontext refers to the point where we were interrupted
* by a signal, we have to use the rt_sigreturn system call to
* return to the context so we get both LR and CTR restored.
*
* Otherwise, the context we are restoring is either just after
* a procedure call (getcontext/swapcontext) or at the beginning
* of a procedure call (makecontext), so we don't need to restore
* r0, xer, ctr. We don't restore r2 since it will be used as
* the TLS pointer.
*/
lwz r0,_UC_GREGS+(PT_MSR*4)(r31)
cmpwi r0,0
bne L(do_sigret)
/* Restore the signal mask */
li r5,0
addi r4,r3,_UC_SIGMASK
li r3,SIG_SETMASK
bl JUMPTARGET(sigprocmask)
cmpwi r3,0
bne L(error_exit)
/* Restore the floating-point registers */
lfd fp31,_UC_FREGS+(32*8)(r31)
lfd fp0,_UC_FREGS+(0*8)(r31)
mtfsf 0xff,fp31
lfd fp1,_UC_FREGS+(1*8)(r31)
lfd fp2,_UC_FREGS+(2*8)(r31)
lfd fp3,_UC_FREGS+(3*8)(r31)
lfd fp4,_UC_FREGS+(4*8)(r31)
lfd fp5,_UC_FREGS+(5*8)(r31)
lfd fp6,_UC_FREGS+(6*8)(r31)
lfd fp7,_UC_FREGS+(7*8)(r31)
lfd fp8,_UC_FREGS+(8*8)(r31)
lfd fp9,_UC_FREGS+(9*8)(r31)
lfd fp10,_UC_FREGS+(10*8)(r31)
lfd fp11,_UC_FREGS+(11*8)(r31)
lfd fp12,_UC_FREGS+(12*8)(r31)
lfd fp13,_UC_FREGS+(13*8)(r31)
lfd fp14,_UC_FREGS+(14*8)(r31)
lfd fp15,_UC_FREGS+(15*8)(r31)
lfd fp16,_UC_FREGS+(16*8)(r31)
lfd fp17,_UC_FREGS+(17*8)(r31)
lfd fp18,_UC_FREGS+(18*8)(r31)
lfd fp19,_UC_FREGS+(19*8)(r31)
lfd fp20,_UC_FREGS+(20*8)(r31)
lfd fp21,_UC_FREGS+(21*8)(r31)
lfd fp22,_UC_FREGS+(22*8)(r31)
lfd fp23,_UC_FREGS+(23*8)(r31)
lfd fp24,_UC_FREGS+(24*8)(r31)
lfd fp25,_UC_FREGS+(25*8)(r31)
lfd fp26,_UC_FREGS+(26*8)(r31)
lfd fp27,_UC_FREGS+(27*8)(r31)
lfd fp28,_UC_FREGS+(28*8)(r31)
lfd fp29,_UC_FREGS+(29*8)(r31)
lfd fp30,_UC_FREGS+(30*8)(r31)
lfd fp31,_UC_FREGS+(31*8)(r31)
/* Restore LR and CCR, and set CTR to the NIP value */
lwz r3,_UC_GREGS+(PT_LNK*4)(r31)
lwz r4,_UC_GREGS+(PT_NIP*4)(r31)
lwz r5,_UC_GREGS+(PT_CCR*4)(r31)
mtlr r3
mtctr r4
mtcr r5
/* Restore the general registers */
lwz r1,_UC_GREGS+(PT_R1*4)(r31)
lwz r3,_UC_GREGS+(PT_R3*4)(r31)
lwz r4,_UC_GREGS+(PT_R4*4)(r31)
lwz r5,_UC_GREGS+(PT_R5*4)(r31)
lwz r6,_UC_GREGS+(PT_R6*4)(r31)
lwz r7,_UC_GREGS+(PT_R7*4)(r31)
lwz r8,_UC_GREGS+(PT_R8*4)(r31)
lwz r9,_UC_GREGS+(PT_R9*4)(r31)
lwz r10,_UC_GREGS+(PT_R10*4)(r31)
lwz r11,_UC_GREGS+(PT_R11*4)(r31)
lwz r12,_UC_GREGS+(PT_R12*4)(r31)
lwz r13,_UC_GREGS+(PT_R13*4)(r31)
lwz r14,_UC_GREGS+(PT_R14*4)(r31)
lwz r15,_UC_GREGS+(PT_R15*4)(r31)
lwz r16,_UC_GREGS+(PT_R16*4)(r31)
lwz r17,_UC_GREGS+(PT_R17*4)(r31)
lwz r18,_UC_GREGS+(PT_R18*4)(r31)
lwz r19,_UC_GREGS+(PT_R19*4)(r31)
lwz r20,_UC_GREGS+(PT_R20*4)(r31)
lwz r21,_UC_GREGS+(PT_R21*4)(r31)
lwz r22,_UC_GREGS+(PT_R22*4)(r31)
lwz r23,_UC_GREGS+(PT_R23*4)(r31)
lwz r24,_UC_GREGS+(PT_R24*4)(r31)
lwz r25,_UC_GREGS+(PT_R25*4)(r31)
lwz r26,_UC_GREGS+(PT_R26*4)(r31)
lwz r27,_UC_GREGS+(PT_R27*4)(r31)
lwz r28,_UC_GREGS+(PT_R28*4)(r31)
lwz r29,_UC_GREGS+(PT_R29*4)(r31)
lwz r30,_UC_GREGS+(PT_R30*4)(r31)
lwz r31,_UC_GREGS+(PT_R31*4)(r31)
bctr
L(error_exit):
lwz r31,12(r1)
lwz r0,20(r1)
addi r1,r1,16
mtlr r0
blr
L(do_sigret):
addi r1,r3,-0xd0
li r0,SYS_ify(rt_sigreturn)
sc
/* NOTREACHED */
PSEUDO_END(__setcontext)
weak_alias(__setcontext, setcontext)
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