AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-12-04 10:50:07 +00:00
Code Issues Packages Projects Releases Wiki Activity
8c77b6ad40
glibc/sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S
Martin Sebor db8fed87d9 powerpc: setcontext.S uses power6 mtfsf when not supported [BZ #18116] 
The attached patch fixes a glibc build failure with gcc 5 on powerpc64le
caused by a recent change in gcc where the compiler defines the
_ARCH_PWR6 macro when processing assembly files but doesn't invoke the
assembler in the corresponding machine mode (unless it has been
explicitly configured to target POWER 6 or later).  A bug had been filed
with gcc for this (65341) but was closed as won't fix. Glibc relies on
the _ARCH_PWR6 macro in a few .S files to make use of Power ISA 2.5
instructions (specifically, the four-argument form of the mtfsf insn).
A similar problem had occurred in the past (bug 10118) but the fix that
was committed for it didn't anticipate this new problem.
2015-06-01 16:19:50 -03:00

797 lines
25 KiB
ArmAsm
Raw Blame History

/* Save current context and install the given one.
Copyright (C) 2002-2015 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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <rtld-global-offsets.h>
#include <shlib-compat.h>
#define __ASSEMBLY__
#include <asm/ptrace.h>
#include "ucontext_i.h"
#include <asm/errno.h>
.section ".toc","aw"
.LC__dl_hwcap:
#ifdef SHARED
.tc _rtld_global_ro[TC],_rtld_global_ro
#else
.tc _dl_hwcap[TC],_dl_hwcap
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)
.section ".text"
ENTRY(__novec_swapcontext)
CALL_MCOUNT 2
std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3)
std r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3)
mflr r0
std r31,-8(1)
cfi_offset(r31,-8)
std r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3)
std r0,FRAME_LR_SAVE(r1)
cfi_offset (lr, FRAME_LR_SAVE)
std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)
stdu r1,-128(r1)
cfi_adjust_cfa_offset (128)
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_FP_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(nv_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. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
cmpdi r0,0
bne L(nv_do_sigret)
# ifdef SHARED
/* Load _rtld-global._dl_hwcap. */
ld r8,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r8)
# else
ld r8,0(r8) /* Load extern _dl_hwcap. */
# endif
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)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
.machine push
.machine "power6"
mtfsf 0xff,fp0,1,0
.machine pop
# else
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r8,PPC_FEATURE_HAS_DFP
beq 5f
.machine push
.machine "power6"
mtfsf 0xff,fp0,1,0
.machine pop
b 6f
/* Continue to operate on the FPSCR as if it were 32-bits. */
5:
mtfsf 0xff,fp0
6:
#endif /* _ARCH_PWR6 */
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)
mtcr 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(nv_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(nv_do_sigret):
mr r1,r3,
li r0,SYS_ify(rt_sigreturn)
sc
/* No return. */
PSEUDO_END(__novec_swapcontext)
compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3)
#endif
.section ".text"
.machine "altivec"
ENTRY(__swapcontext)
CALL_MCOUNT 2
std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3)
std r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3)
mflr r0
std r31,-8(1)
cfi_offset(r31,-8)
std r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3)
std r0,FRAME_LR_SAVE(r1)
cfi_offset (lr, FRAME_LR_SAVE)
std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3)
std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)
stdu r1,-128(r1)
cfi_adjust_cfa_offset(128)
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_FP_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)
ld r8,.LC__dl_hwcap@toc(r2)
#ifdef SHARED
/* Load _rtld-global._dl_hwcap. */
ld r8,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r8)
#else
ld r8,0(r8) /* Load extern _dl_hwcap. */
#endif
la r10,(SIGCONTEXT_V_RESERVE+8)(r3)
la r9,(SIGCONTEXT_V_RESERVE+24)(r3)
andis. r6,r8,(PPC_FEATURE_HAS_ALTIVEC >> 16)
clrrdi r10,r10,4
beq L(has_no_vec)
clrrdi r9,r9,4
mr r8,r10 /* Capture *v_regs value in r5. */
stvx v0,0,r10
stvx v1,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v2,0,r10
stvx v3,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v4,0,r10
stvx v5,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v6,0,r10
stvx v7,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v8,0,r10
stvx v9,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v10,0,r10
stvx v11,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v12,0,r10
stvx v13,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v14,0,r10
stvx v15,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v16,0,r10
stvx v17,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v18,0,r10
stvx v19,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v20,0,r10
stvx v21,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v22,0,r10
stvx v23,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v24,0,r10
stvx v25,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v26,0,r10
stvx v27,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v28,0,r10
stvx v29,0,r9
addi r10,r10,32
addi r9,r9,32
stvx v30,0,r10
stvx v31,0,r9
addi r10,r10,32
addi r9,r9,32
mfvscr v0
mfspr r0,VRSAVE
stvx v0,0,r10
stw r0,0(r9)
L(has_no_vec):
/*
Store either a NULL or a quadword aligned pointer to the Vector register
array into *v_regs.
*/
std r8,(SIGCONTEXT_V_REGS_PTR)(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. */
ld r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
cmpdi r0,0
bne L(do_sigret)
ld r8,.LC__dl_hwcap@toc(r2)
ld r10,(SIGCONTEXT_V_REGS_PTR)(r31)
# ifdef SHARED
/* Load _rtld-global._dl_hwcap. */
ld r8,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r8)
# else
ld r8,0(r8) /* Load extern _dl_hwcap. */
# endif
andis. r6,r8,(PPC_FEATURE_HAS_ALTIVEC >> 16)
beq L(has_no_vec2)
cmpdi r10,0
beq L(has_no_vec2)
lwz r0,(33*16)(r10)
li r9,(16*32)
mtspr VRSAVE,r0
cmpwi r0,0
beq L(has_no_vec2)
lvx v19,r9,r10
la r9,(16)(r10)
lvx v0,0,r10
lvx v1,0,r9
addi r10,r10,32
addi r9,r9,32
mtvscr v19
lvx v2,0,r10
lvx v3,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v4,0,r10
lvx v5,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v6,0,r10
lvx v7,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v8,0,r10
lvx v9,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v10,0,r10
lvx v11,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v12,0,r10
lvx v13,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v14,0,r10
lvx v15,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v16,0,r10
lvx v17,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v18,0,r10
lvx v19,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v20,0,r10
lvx v21,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v22,0,r10
lvx v23,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v24,0,r10
lvx v25,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v26,0,r10
lvx v27,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v28,0,r10
lvx v29,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v30,0,r10
lvx v31,0,r9
addi r10,r10,32
addi r9,r9,32
lvx v10,0,r10
lvx v11,0,r9
addi r10,r10,32
addi r9,r9,32
L(has_no_vec2):
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)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
.machine push
.machine "power6"
mtfsf 0xff,fp0,1,0
.machine pop
# else
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r8,PPC_FEATURE_HAS_DFP
beq 7f
.machine push
.machine "power6"
mtfsf 0xff,fp0,1,0
.machine pop
b 8f
/* Continue to operate on the FPSCR as if it were 32-bits. */
7:
mtfsf 0xff,fp0
8:
#endif /* _ARCH_PWR6 */
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)
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)
mtcr r0
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. */
PSEUDO_END(__swapcontext)
versioned_symbol (libc, __swapcontext, swapcontext, GLIBC_2_3_4)
Reference in New Issue View Git Blame Copy Permalink