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3e4fc359f4
2003-01-31 Steven Munroe <sjmunroe@us.ibm.com> * sysdeps/unix/sysv/linux/powerpc/powerpc64/fe_nomask.c: Include kernel-features.h * sysdeps/unix/sysv/linux/powerpc/powerpc64/getcontext.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S: Likewise.
180 lines
6.6 KiB
ArmAsm
180 lines
6.6 KiB
ArmAsm
/* Switch to context.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include "kernel-features.h"
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#define __ASSEMBLY__
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#include <asm/ptrace.h>
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#include "ucontext_i.h"
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#include <asm/errno.h>
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ENTRY(__setcontext)
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#ifdef __ASSUME_NEW_RT_SIGRETURN_SYSCALL
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mflr r0
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std r31,-8(1)
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std r0,FRAME_LR_SAVE(r1)
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stdu r1,-128(r1)
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mr r31,r3
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/*
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* If this ucontext refers to the point where we were interrupted
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* by a signal, we have to use the rt_sigreturn system call to
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* return to the context so we get both LR and CTR restored.
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*
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* Otherwise, the context we are restoring is either just after
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* a procedure call (getcontext/swapcontext) or at the beginning
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* of a procedure call (makecontext), so we don't need to restore
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* msr and ctr. We don't restore r13 since it will be used as
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* the TLS pointer. */
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lwz r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r31)
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cmpdi r0,0
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bne L(do_sigret)
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li r5,0
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addi r4,r3,UCONTEXT_SIGMASK
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li r3,SIG_SETMASK
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bl JUMPTARGET(sigprocmask)
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nop
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cmpdi r3,0
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bne L(error_exit)
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lfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r31)
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lfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r31)
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lfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r31)
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mtfsf 0xff,fp0
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lfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r31)
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lfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r31)
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lfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r31)
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lfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r31)
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lfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r31)
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lfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r31)
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lfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r31)
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lfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r31)
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lfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r31)
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lfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r31)
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lfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r31)
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lfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r31)
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lfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r31)
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lfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r31)
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lfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r31)
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lfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r31)
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lfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r31)
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lfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r31)
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lfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r31)
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lfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r31)
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lfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r31)
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lfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r31)
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lfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r31)
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lfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r31)
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lfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r31)
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lfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r31)
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lfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r31)
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lfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r31)
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lfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r31)
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lfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r31)
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ld r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r31)
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ld r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r31)
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mtlr r0
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ld r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r31)
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ld r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r31)
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ld r3,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r31)
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mtxer r0
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ld r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r31)
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ld r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r31)
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ld r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r31)
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mfcr r0
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ld r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r31)
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ld r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r31)
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ld r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r31)
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ld r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r31)
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ld r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r31)
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ld r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r31)
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ld r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r31)
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/* Don't reload the thread ID or TLS pointer (r13). */
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ld r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r31)
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ld r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r31)
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ld r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r31)
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ld r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r31)
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ld r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r31)
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ld r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r31)
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ld r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r31)
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ld r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r31)
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ld r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r31)
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ld r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r31)
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ld r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r31)
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ld r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r31)
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ld r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r31)
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ld r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r31)
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ld r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r31)
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ld r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r31)
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ld r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r31)
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/* Now we branch to the "Next Instruction Pointer" from the saved
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context. With the powerpc64 instruction set there is no good way to
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do this (from user state) without clobbering either the LR or CTR.
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The makecontext and swapcontext functions depend on the callers
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LR being preserved so we use the CTR. */
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ld r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r31)
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mtctr r0
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ld r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r31)
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ld r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r31)
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bctr
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L(error_exit):
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ld r0,128+FRAME_LR_SAVE(r1)
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addi r1,r1,128
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mtlr r0
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ld r31,-8(r1)
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blr
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/* At this point we assume that the ucontext was created by a
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rt_signal and we should use rt_sigreturn to restore the original
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state. As of the 2.4.21 kernel the ucontext is the first thing
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(offset 0) in the rt_signal frame and rt_sigreturn expects the
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ucontext address in R1. Normally the rt-signal trampoline handles
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this by popping dummy frame before the rt_signal syscall. In our
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case the stack may not be in its original (signal handler return with
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R1 pointing at the dummy frame) state. We do have the ucontext
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address in R3, so simply copy R3 to R1 before the syscall. */
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L(do_sigret):
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mr r1,r3,
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li r0,SYS_ify(rt_sigreturn)
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sc
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/* No return. */
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#else
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/* If the kernel is not at least 2.4.21 then generate a ENOSYS stub. */
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mflr r0
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std r0,FRAME_LR_SAVE(r1)
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stdu r1,-128(r1)
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li r3,ENOSYS
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bl JUMPTARGET(__syscall_error)
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nop
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li r3,-1
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ld r0,128+FRAME_LR_SAVE(r1)
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addi r1,r1,128
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mtlr r0
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blr
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#endif
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PSEUDO_END(__setcontext)
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weak_alias(__setcontext, setcontext)
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