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/* Save current context and install the given one.
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"
#include <asm/errno.h>
ENTRY(__swapcontext)
#ifdef __ASSUME_NEW_RT_SIGRETURN_SYSCALL
std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3)
std r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3)
mflr r0
std r31,-8(1)
std r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3)
std r0,FRAME_LR_SAVE(r1)
std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)
stdu r1,-128(r1)
std r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r3)
std r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r3)
std r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r3)
std r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r3)
std r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r3)
std r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r3)
std r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r3)
std r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r3)
std r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r3)
std r13,(SIGCONTEXT_GP_REGS+(PT_R13*8))(r3)
std r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r3)
std r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r3)
std r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r3)
std r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r3)
std r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r3)
std r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r3)
std r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r3)
std r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r3)
std r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r3)
std r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r3)
std r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r3)
std r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r3)
std r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r3)
std r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r3)
std r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r3)
std r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r3)
std r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r3)
std r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r3)
mfctr r0
std r0,(SIGCONTEXT_GP_REGS+(PT_CTR*8))(r3)
mfxer r0
std r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r3)
mfcr r0
std r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r3)
/* Set the return value of swapcontext to "success". R3 is the only
register whose value is not preserved in the saved context. */
li r0,0
std r0,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r3)
/* Zero fill fields that can't be set in user state or are unused. */
std r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(34*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(PT_SOFTE*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(40*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(41*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(42*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(PT_RESULT*8))(r3)
/* Set the PT_REGS pointer to the address of sigcontext gp_regs
field. Struct pt_regs and elf_gregset_t are the same thing.
We kept the regs field for backwards compatibility with
libraries built before we extended sigcontext. */
addi r0,r3,SIGCONTEXT_GP_REGS
std r0,SIGCONTEXT_PT_REGS(r3)
stfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r3)
stfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r3)
stfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r3)
stfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r3)
stfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r3)
stfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r3)
stfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r3)
stfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r3)
stfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r3)
stfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r3)
stfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r3)
stfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r3)
stfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r3)
stfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r3)
stfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r3)
stfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r3)
stfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r3)
stfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r3)
stfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r3)
stfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r3)
stfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r3)
stfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r3)
stfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r3)
stfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r3)
stfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r3)
stfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r3)
stfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r3)
stfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r3)
stfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r3)
stfd fp29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r3)
mffs fp0
stfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r3)
stfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r3)
stfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r3)
mr r31,r4
addi r5,r3,UCONTEXT_SIGMASK
addi r4,r4,UCONTEXT_SIGMASK
li r3,SIG_SETMASK
bl JUMPTARGET(sigprocmask)
nop
cmpdi r3,0
bne L(error_exit)
/*
* If this new 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
* msr and ctr. We don't restore r13 since it will be used as
* the TLS pointer. */
lwz r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
cmpdi r0,0
bne L(do_sigret)
lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31)
lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r31)
lfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r31)
mtfsf 0xff,fp0
lfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r31)
lfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r31)
lfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r31)
lfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r31)
lfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r31)
lfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r31)
lfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r31)
lfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r31)
lfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r31)
lfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r31)
lfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r31)
lfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r31)
lfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r31)
lfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r31)
lfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r31)
lfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r31)
lfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r31)
lfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r31)
lfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r31)
lfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r31)
lfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r31)
lfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r31)
lfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r31)
lfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r31)
lfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r31)
lfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r31)
lfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r31)
lfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r31)
lfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r31)
lfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r31)
ld r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r31)
mtlr r0
ld r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r31)
ld r3,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r31)
mtxer r0
ld r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r31)
ld r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r31)
ld r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r31)
mfcr r0
ld r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r31)
ld r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r31)
ld r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r31)
ld r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r31)
ld r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r31)
ld r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r31)
ld r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r31)
/* Don't reload the thread ID or TLS pointer (r13). */
ld r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r31)
ld r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r31)
ld r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r31)
ld r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r31)
ld r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r31)
ld r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r31)
ld r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r31)
ld r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r31)
ld r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r31)
ld r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r31)
ld r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r31)
ld r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r31)
ld r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r31)
ld r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r31)
ld r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r31)
ld r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r31)
ld r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r31)
/* Now we branch to the "Next Instruction Pointer" from the saved
context. With the powerpc64 instruction set there is no good way to
do this (from user state) without clobbering either the LR or CTR.
The makecontext and swapcontext functions depend on the callers
LR being preserved so we use the CTR. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r31)
mtctr r0
ld r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r31)
ld r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r31)
bctr
L(error_exit):
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
ld r31,-8(r1)
blr
/* At this point we assume that the ucontext was created by a
rt_signal and we should use rt_sigreturn to restore the original
state. As of the 2.4.21 kernel the ucontext is the first thing
(offset 0) in the rt_signal frame and rt_sigreturn expects the
ucontext address in R1. Normally the rt-signal trampoline handles
this by popping dummy frame before the rt_signal syscall. In our
case the stack may not be in its original (signal handler return with
R1 pointing at the dummy frame) state. We do have the ucontext
address in R3, so simply copy R3 to R1 before the syscall. */
L(do_sigret):
mr r1,r3,
li r0,SYS_ify(rt_sigreturn)
sc
/* No return. */
#else
/* If the kernel is not at least 2.4.21 then generate a ENOSYS stub. */
mflr r0
std r0,FRAME_LR_SAVE(r1)
stdu r1,-128(r1)
li r3,ENOSYS
bl JUMPTARGET(__syscall_error)
nop
li r3,-1
ld r0,128+FRAME_LR_SAVE(r1)
addi r1,r1,128
mtlr r0
blr
#endif
PSEUDO_END(__swapcontext)
weak_alias(__swapcontext, swapcontext)
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